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libcxxabi contains the runtime support for C++. But, as some folks have 

realized, it is not complete.  It relies on some _Unwind_* functions to be
supplied by the OS. That means it cannot be ported to platforms that don’t 
already have an unwinder.  

Years ago Apple wrote its own unwinder for MacOSX and iOS.  To make libcxxabi 
complete, Apple has decided the source code for its unwinder can be contributed
to the open source LLVM libcxxabi project, with a dual licensed under LLVM 
and MIT license.

So, I’ve spent some time cleaning up the sources to make them conform with 
LLVM style and to conditionalize the sources in a way that should make it 
easier to port to other platforms.  The sources are in a separate "Unwind" 
directory under "src" in libcxxabi.  

Background:
Most architectures now use "zero cost" exceptions for C++.  The zero cost means
there are no extra instructions executed if no exceptions are thrown.  But if 
an exception is thrown, the runtime must consult side tables and figure out how
to restore registers and "unwind" from the current stack frame to the catch 
clause.  That ability to modify the stack frames and cause the thread to resume 
in a catch clause with all registers restored properly is the main purpose 
of the unwinder.

This unwinder has two levels of API.  The high level APIs are the _Unwind_* 
functions which the cxa_* exception functions in libcxxabi require.  The low 
level APIs are the unw_* functions which are an interface defined by the the 
old HP libunwind project (which shares no code with this unwinder).

llvm-svn: 192136
This commit is contained in:
Nick Kledzik 2013-10-07 21:39:41 +00:00
parent 57a2d2f7fd
commit 312fcd0e1c
20 changed files with 8889 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

356
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//===---------------------------- libunwind.h -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Compatible with libuwind API documented at:
// http://www.nongnu.org/libunwind/man/libunwind(3).html
//
//===----------------------------------------------------------------------===//
#ifndef __LIBUNWIND__
#define __LIBUNWIND__
#include <stdint.h>
#include <stddef.h>
#if __APPLE__
#include <Availability.h>
#if __arm__
#define LIBUNWIND_AVAIL __attribute__((unavailable))
#else
#define LIBUNWIND_AVAIL __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_5_0)
#endif
#else
#define LIBUNWIND_AVAIL
#endif
/* error codes */
enum {
UNW_ESUCCESS = 0, /* no error */
UNW_EUNSPEC = -6540, /* unspecified (general) error */
UNW_ENOMEM = -6541, /* out of memory */
UNW_EBADREG = -6542, /* bad register number */
UNW_EREADONLYREG = -6543, /* attempt to write read-only register */
UNW_ESTOPUNWIND = -6544, /* stop unwinding */
UNW_EINVALIDIP = -6545, /* invalid IP */
UNW_EBADFRAME = -6546, /* bad frame */
UNW_EINVAL = -6547, /* unsupported operation or bad value */
UNW_EBADVERSION = -6548, /* unwind info has unsupported version */
UNW_ENOINFO = -6549 /* no unwind info found */
};
struct unw_context_t {
uint64_t data[128];
};
typedef struct unw_context_t unw_context_t;
struct unw_cursor_t {
uint64_t data[140];
};
typedef struct unw_cursor_t unw_cursor_t;
typedef struct unw_addr_space *unw_addr_space_t;
typedef int unw_regnum_t;
typedef uint64_t unw_word_t;
typedef double unw_fpreg_t;
struct unw_proc_info_t {
unw_word_t start_ip; /* start address of function */
unw_word_t end_ip; /* address after end of function */
unw_word_t lsda; /* address of language specific data area, */
/* or zero if not used */
unw_word_t handler; /* personality routine, or zero if not used */
unw_word_t gp; /* not used */
unw_word_t flags; /* not used */
uint32_t format; /* compact unwind encoding, or zero if none */
uint32_t unwind_info_size; /* size of dwarf unwind info, or zero if none */
unw_word_t unwind_info; /* address of dwarf unwind info, or zero */
unw_word_t extra; /* mach_header of mach-o image containing func */
};
typedef struct unw_proc_info_t unw_proc_info_t;
#ifdef __cplusplus
extern "C" {
#endif
extern int unw_getcontext(unw_context_t *) LIBUNWIND_AVAIL;
extern int unw_init_local(unw_cursor_t *, unw_context_t *) LIBUNWIND_AVAIL;
extern int unw_step(unw_cursor_t *) LIBUNWIND_AVAIL;
extern int unw_get_reg(unw_cursor_t *, unw_regnum_t, unw_word_t *) LIBUNWIND_AVAIL;
extern int unw_get_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t *) LIBUNWIND_AVAIL;
extern int unw_set_reg(unw_cursor_t *, unw_regnum_t, unw_word_t) LIBUNWIND_AVAIL;
extern int unw_set_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t) LIBUNWIND_AVAIL;
extern int unw_resume(unw_cursor_t *) LIBUNWIND_AVAIL;
extern const char *unw_regname(unw_cursor_t *, unw_regnum_t) LIBUNWIND_AVAIL;
extern int unw_get_proc_info(unw_cursor_t *, unw_proc_info_t *) LIBUNWIND_AVAIL;
extern int unw_is_fpreg(unw_cursor_t *, unw_regnum_t) LIBUNWIND_AVAIL;
extern int unw_is_signal_frame(unw_cursor_t *) LIBUNWIND_AVAIL;
extern int unw_get_proc_name(unw_cursor_t *, char *, size_t, unw_word_t *) LIBUNWIND_AVAIL;
//extern int unw_get_save_loc(unw_cursor_t*, int, unw_save_loc_t*);
#if UNW_REMOTE
/*
* Mac OS X "remote" API for unwinding other processes on same machine
*
*/
extern unw_addr_space_t unw_local_addr_space;
extern unw_addr_space_t unw_create_addr_space_for_task(task_t);
extern void unw_destroy_addr_space(unw_addr_space_t);
extern int unw_init_remote_thread(unw_cursor_t *, unw_addr_space_t, thread_t *);
#endif
/*
* traditional libuwind "remote" API
* NOT IMPLEMENTED on Mac OS X
*
* extern int unw_init_remote(unw_cursor_t*, unw_addr_space_t,
* thread_t*);
* extern unw_accessors_t unw_get_accessors(unw_addr_space_t);
* extern unw_addr_space_t unw_create_addr_space(unw_accessors_t, int);
* extern void unw_flush_cache(unw_addr_space_t, unw_word_t,
* unw_word_t);
* extern int unw_set_caching_policy(unw_addr_space_t,
* unw_caching_policy_t);
* extern void _U_dyn_register(unw_dyn_info_t*);
* extern void _U_dyn_cancel(unw_dyn_info_t*);
*/
#ifdef __cplusplus
}
#endif
// architecture independent register numbers
enum {
UNW_REG_IP = -1, // instruction pointer
UNW_REG_SP = -2, // stack pointer
};
// 32-bit x86 registers
enum {
UNW_X86_EAX = 0,
UNW_X86_ECX = 1,
UNW_X86_EDX = 2,
UNW_X86_EBX = 3,
UNW_X86_EBP = 4,
UNW_X86_ESP = 5,
UNW_X86_ESI = 6,
UNW_X86_EDI = 7
};
// 64-bit x86_64 registers
enum {
UNW_X86_64_RAX = 0,
UNW_X86_64_RDX = 1,
UNW_X86_64_RCX = 2,
UNW_X86_64_RBX = 3,
UNW_X86_64_RSI = 4,
UNW_X86_64_RDI = 5,
UNW_X86_64_RBP = 6,
UNW_X86_64_RSP = 7,
UNW_X86_64_R8 = 8,
UNW_X86_64_R9 = 9,
UNW_X86_64_R10 = 10,
UNW_X86_64_R11 = 11,
UNW_X86_64_R12 = 12,
UNW_X86_64_R13 = 13,
UNW_X86_64_R14 = 14,
UNW_X86_64_R15 = 15
};
// 32-bit ppc register numbers
enum {
UNW_PPC_R0 = 0,
UNW_PPC_R1 = 1,
UNW_PPC_R2 = 2,
UNW_PPC_R3 = 3,
UNW_PPC_R4 = 4,
UNW_PPC_R5 = 5,
UNW_PPC_R6 = 6,
UNW_PPC_R7 = 7,
UNW_PPC_R8 = 8,
UNW_PPC_R9 = 9,
UNW_PPC_R10 = 10,
UNW_PPC_R11 = 11,
UNW_PPC_R12 = 12,
UNW_PPC_R13 = 13,
UNW_PPC_R14 = 14,
UNW_PPC_R15 = 15,
UNW_PPC_R16 = 16,
UNW_PPC_R17 = 17,
UNW_PPC_R18 = 18,
UNW_PPC_R19 = 19,
UNW_PPC_R20 = 20,
UNW_PPC_R21 = 21,
UNW_PPC_R22 = 22,
UNW_PPC_R23 = 23,
UNW_PPC_R24 = 24,
UNW_PPC_R25 = 25,
UNW_PPC_R26 = 26,
UNW_PPC_R27 = 27,
UNW_PPC_R28 = 28,
UNW_PPC_R29 = 29,
UNW_PPC_R30 = 30,
UNW_PPC_R31 = 31,
UNW_PPC_F0 = 32,
UNW_PPC_F1 = 33,
UNW_PPC_F2 = 34,
UNW_PPC_F3 = 35,
UNW_PPC_F4 = 36,
UNW_PPC_F5 = 37,
UNW_PPC_F6 = 38,
UNW_PPC_F7 = 39,
UNW_PPC_F8 = 40,
UNW_PPC_F9 = 41,
UNW_PPC_F10 = 42,
UNW_PPC_F11 = 43,
UNW_PPC_F12 = 44,
UNW_PPC_F13 = 45,
UNW_PPC_F14 = 46,
UNW_PPC_F15 = 47,
UNW_PPC_F16 = 48,
UNW_PPC_F17 = 49,
UNW_PPC_F18 = 50,
UNW_PPC_F19 = 51,
UNW_PPC_F20 = 52,
UNW_PPC_F21 = 53,
UNW_PPC_F22 = 54,
UNW_PPC_F23 = 55,
UNW_PPC_F24 = 56,
UNW_PPC_F25 = 57,
UNW_PPC_F26 = 58,
UNW_PPC_F27 = 59,
UNW_PPC_F28 = 60,
UNW_PPC_F29 = 61,
UNW_PPC_F30 = 62,
UNW_PPC_F31 = 63,
UNW_PPC_MQ = 64,
UNW_PPC_LR = 65,
UNW_PPC_CTR = 66,
UNW_PPC_AP = 67,
UNW_PPC_CR0 = 68,
UNW_PPC_CR1 = 69,
UNW_PPC_CR2 = 70,
UNW_PPC_CR3 = 71,
UNW_PPC_CR4 = 72,
UNW_PPC_CR5 = 73,
UNW_PPC_CR6 = 74,
UNW_PPC_CR7 = 75,
UNW_PPC_XER = 76,
UNW_PPC_V0 = 77,
UNW_PPC_V1 = 78,
UNW_PPC_V2 = 79,
UNW_PPC_V3 = 80,
UNW_PPC_V4 = 81,
UNW_PPC_V5 = 82,
UNW_PPC_V6 = 83,
UNW_PPC_V7 = 84,
UNW_PPC_V8 = 85,
UNW_PPC_V9 = 86,
UNW_PPC_V10 = 87,
UNW_PPC_V11 = 88,
UNW_PPC_V12 = 89,
UNW_PPC_V13 = 90,
UNW_PPC_V14 = 91,
UNW_PPC_V15 = 92,
UNW_PPC_V16 = 93,
UNW_PPC_V17 = 94,
UNW_PPC_V18 = 95,
UNW_PPC_V19 = 96,
UNW_PPC_V20 = 97,
UNW_PPC_V21 = 98,
UNW_PPC_V22 = 99,
UNW_PPC_V23 = 100,
UNW_PPC_V24 = 101,
UNW_PPC_V25 = 102,
UNW_PPC_V26 = 103,
UNW_PPC_V27 = 104,
UNW_PPC_V28 = 105,
UNW_PPC_V29 = 106,
UNW_PPC_V30 = 107,
UNW_PPC_V31 = 108,
UNW_PPC_VRSAVE = 109,
UNW_PPC_VSCR = 110,
UNW_PPC_SPE_ACC = 111,
UNW_PPC_SPEFSCR = 112
};
// 64-bit ARM64 registers
enum {
UNW_ARM64_X0 = 0,
UNW_ARM64_X1 = 1,
UNW_ARM64_X2 = 2,
UNW_ARM64_X3 = 3,
UNW_ARM64_X4 = 4,
UNW_ARM64_X5 = 5,
UNW_ARM64_X6 = 6,
UNW_ARM64_X7 = 7,
UNW_ARM64_X8 = 8,
UNW_ARM64_X9 = 9,
UNW_ARM64_X10 = 10,
UNW_ARM64_X11 = 11,
UNW_ARM64_X12 = 12,
UNW_ARM64_X13 = 13,
UNW_ARM64_X14 = 14,
UNW_ARM64_X15 = 15,
UNW_ARM64_X16 = 16,
UNW_ARM64_X17 = 17,
UNW_ARM64_X18 = 18,
UNW_ARM64_X19 = 19,
UNW_ARM64_X20 = 20,
UNW_ARM64_X21 = 21,
UNW_ARM64_X22 = 22,
UNW_ARM64_X23 = 23,
UNW_ARM64_X24 = 24,
UNW_ARM64_X25 = 25,
UNW_ARM64_X26 = 26,
UNW_ARM64_X27 = 27,
UNW_ARM64_X28 = 28,
UNW_ARM64_X29 = 29,
UNW_ARM64_FP = 29,
UNW_ARM64_X30 = 30,
UNW_ARM64_LR = 30,
UNW_ARM64_X31 = 31,
UNW_ARM64_SP = 31,
// reserved block
UNW_ARM64_D0 = 64,
UNW_ARM64_D1 = 65,
UNW_ARM64_D2 = 66,
UNW_ARM64_D3 = 67,
UNW_ARM64_D4 = 68,
UNW_ARM64_D5 = 69,
UNW_ARM64_D6 = 70,
UNW_ARM64_D7 = 71,
UNW_ARM64_D8 = 72,
UNW_ARM64_D9 = 73,
UNW_ARM64_D10 = 74,
UNW_ARM64_D11 = 75,
UNW_ARM64_D12 = 76,
UNW_ARM64_D13 = 77,
UNW_ARM64_D14 = 78,
UNW_ARM64_D15 = 79,
UNW_ARM64_D16 = 80,
UNW_ARM64_D17 = 81,
UNW_ARM64_D18 = 82,
UNW_ARM64_D19 = 83,
UNW_ARM64_D20 = 84,
UNW_ARM64_D21 = 85,
UNW_ARM64_D22 = 86,
UNW_ARM64_D23 = 87,
UNW_ARM64_D24 = 88,
UNW_ARM64_D25 = 89,
UNW_ARM64_D26 = 90,
UNW_ARM64_D27 = 91,
UNW_ARM64_D28 = 92,
UNW_ARM64_D29 = 93,
UNW_ARM64_D30 = 94,
UNW_ARM64_D31 = 95,
};
#endif

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//===------------------ mach-o/compact_unwind_encoding.h ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Darwin's alternative to dwarf based unwind encodings.
//
//===----------------------------------------------------------------------===//
#ifndef __COMPACT_UNWIND_ENCODING__
#define __COMPACT_UNWIND_ENCODING__
#include <stdint.h>
//
// Compilers can emit standard Dwarf FDEs in the __TEXT,__eh_frame section
// of object files. Or compilers can emit compact unwind information in
// the __LD,__compact_unwind section.
//
// When the linker creates a final linked image, it will create a
// __TEXT,__unwind_info section. This section is a small and fast way for the
// runtime to access unwind info for any given function. If the compiler
// emitted compact unwind info for the function, that compact unwind info will
// be encoded in the __TEXT,__unwind_info section. If the compiler emitted
// dwarf unwind info, the __TEXT,__unwind_info section will contain the offset
// of the FDE in the __TEXT,__eh_frame section in the final linked image.
//
// Note: Previously, the linker would transform some dwarf unwind infos into
// compact unwind info. But that is fragile and no longer done.
//
// The compact unwind endoding is a 32-bit value which encoded in an
// architecture specific way, which registers to restore from where, and how
// to unwind out of the function.
//
typedef uint32_t compact_unwind_encoding_t;
// architecture independent bits
enum {
UNWIND_IS_NOT_FUNCTION_START = 0x80000000,
UNWIND_HAS_LSDA = 0x40000000,
UNWIND_PERSONALITY_MASK = 0x30000000,
};
//
// x86
//
// 1-bit: start
// 1-bit: has lsda
// 2-bit: personality index
//
// 4-bits: 0=old, 1=ebp based, 2=stack-imm, 3=stack-ind, 4=dwarf
// ebp based:
// 15-bits (5*3-bits per reg) register permutation
// 8-bits for stack offset
// frameless:
// 8-bits stack size
// 3-bits stack adjust
// 3-bits register count
// 10-bits register permutation
//
enum {
UNWIND_X86_MODE_MASK = 0x0F000000,
UNWIND_X86_MODE_EBP_FRAME = 0x01000000,
UNWIND_X86_MODE_STACK_IMMD = 0x02000000,
UNWIND_X86_MODE_STACK_IND = 0x03000000,
UNWIND_X86_MODE_DWARF = 0x04000000,
UNWIND_X86_EBP_FRAME_REGISTERS = 0x00007FFF,
UNWIND_X86_EBP_FRAME_OFFSET = 0x00FF0000,
UNWIND_X86_FRAMELESS_STACK_SIZE = 0x00FF0000,
UNWIND_X86_FRAMELESS_STACK_ADJUST = 0x0000E000,
UNWIND_X86_FRAMELESS_STACK_REG_COUNT = 0x00001C00,
UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF,
UNWIND_X86_DWARF_SECTION_OFFSET = 0x00FFFFFF,
};
enum {
UNWIND_X86_REG_NONE = 0,
UNWIND_X86_REG_EBX = 1,
UNWIND_X86_REG_ECX = 2,
UNWIND_X86_REG_EDX = 3,
UNWIND_X86_REG_EDI = 4,
UNWIND_X86_REG_ESI = 5,
UNWIND_X86_REG_EBP = 6,
};
//
// For x86 there are four modes for the compact unwind encoding:
// UNWIND_X86_MODE_EBP_FRAME:
// EBP based frame where EBP is push on stack immediately after return address,
// then ESP is moved to EBP. Thus, to unwind ESP is restored with the current
// EPB value, then EBP is restored by popping off the stack, and the return
// is done by popping the stack once more into the pc.
// All non-volatile registers that need to be restored must have been saved
// in a small range in the stack that starts EBP-4 to EBP-1020. The offset/4
// is encoded in the UNWIND_X86_EBP_FRAME_OFFSET bits. The registers saved
// are encoded in the UNWIND_X86_EBP_FRAME_REGISTERS bits as five 3-bit entries.
// Each entry contains which register to restore.
// UNWIND_X86_MODE_STACK_IMMD:
// A "frameless" (EBP not used as frame pointer) function with a small
// constant stack size. To return, a constant (encoded in the compact
// unwind encoding) is added to the ESP. Then the return is done by
// popping the stack into the pc.
// All non-volatile registers that need to be restored must have been saved
// on the stack immediately after the return address. The stack_size/4 is
// encoded in the UNWIND_X86_FRAMELESS_STACK_SIZE (max stack size is 1024).
// The number of registers saved is encoded in UNWIND_X86_FRAMELESS_STACK_REG_COUNT.
// UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION constains which registers were
// saved and their order.
// UNWIND_X86_MODE_STACK_IND:
// A "frameless" (EBP not used as frame pointer) function large constant
// stack size. This case is like the previous, except the stack size is too
// large to encode in the compact unwind encoding. Instead it requires that
// the function contains "subl $nnnnnnnn,ESP" in its prolog. The compact
// encoding contains the offset to the nnnnnnnn value in the function in
// UNWIND_X86_FRAMELESS_STACK_SIZE.
// UNWIND_X86_MODE_DWARF:
// No compact unwind encoding is available. Instead the low 24-bits of the
// compact encoding is the offset of the dwarf FDE in the __eh_frame section.
// This mode is never used in object files. It is only generated by the
// linker in final linked images which have only dwarf unwind info for a
// function.
//
// The following is the algorithm used to create the permutation encoding used
// with frameless stacks. It is passed the number of registers to be saved and
// an array of the register numbers saved.
//
//uint32_t permute_encode(uint32_t registerCount, const uint32_t registers[6])
//{
// uint32_t renumregs[6];
// for (int i=6-registerCount; i < 6; ++i) {
// int countless = 0;
// for (int j=6-registerCount; j < i; ++j) {
// if ( registers[j] < registers[i] )
// ++countless;
// }
// renumregs[i] = registers[i] - countless -1;
// }
// uint32_t permutationEncoding = 0;
// switch ( registerCount ) {
// case 6:
// permutationEncoding |= (120*renumregs[0] + 24*renumregs[1]
// + 6*renumregs[2] + 2*renumregs[3]
// + renumregs[4]);
// break;
// case 5:
// permutationEncoding |= (120*renumregs[1] + 24*renumregs[2]
// + 6*renumregs[3] + 2*renumregs[4]
// + renumregs[5]);
// break;
// case 4:
// permutationEncoding |= (60*renumregs[2] + 12*renumregs[3]
// + 3*renumregs[4] + renumregs[5]);
// break;
// case 3:
// permutationEncoding |= (20*renumregs[3] + 4*renumregs[4]
// + renumregs[5]);
// break;
// case 2:
// permutationEncoding |= (5*renumregs[4] + renumregs[5]);
// break;
// case 1:
// permutationEncoding |= (renumregs[5]);
// break;
// }
// return permutationEncoding;
//}
//
//
// x86_64
//
// 1-bit: start
// 1-bit: has lsda
// 2-bit: personality index
//
// 4-bits: 0=old, 1=rbp based, 2=stack-imm, 3=stack-ind, 4=dwarf
// rbp based:
// 15-bits (5*3-bits per reg) register permutation
// 8-bits for stack offset
// frameless:
// 8-bits stack size
// 3-bits stack adjust
// 3-bits register count
// 10-bits register permutation
//
enum {
UNWIND_X86_64_MODE_MASK = 0x0F000000,
UNWIND_X86_64_MODE_RBP_FRAME = 0x01000000,
UNWIND_X86_64_MODE_STACK_IMMD = 0x02000000,
UNWIND_X86_64_MODE_STACK_IND = 0x03000000,
UNWIND_X86_64_MODE_DWARF = 0x04000000,
UNWIND_X86_64_RBP_FRAME_REGISTERS = 0x00007FFF,
UNWIND_X86_64_RBP_FRAME_OFFSET = 0x00FF0000,
UNWIND_X86_64_FRAMELESS_STACK_SIZE = 0x00FF0000,
UNWIND_X86_64_FRAMELESS_STACK_ADJUST = 0x0000E000,
UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT = 0x00001C00,
UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF,
UNWIND_X86_64_DWARF_SECTION_OFFSET = 0x00FFFFFF,
};
enum {
UNWIND_X86_64_REG_NONE = 0,
UNWIND_X86_64_REG_RBX = 1,
UNWIND_X86_64_REG_R12 = 2,
UNWIND_X86_64_REG_R13 = 3,
UNWIND_X86_64_REG_R14 = 4,
UNWIND_X86_64_REG_R15 = 5,
UNWIND_X86_64_REG_RBP = 6,
};
//
// For x86_64 there are four modes for the compact unwind encoding:
// UNWIND_X86_64_MODE_RBP_FRAME:
// RBP based frame where RBP is push on stack immediately after return address,
// then RSP is moved to RBP. Thus, to unwind RSP is restored with the current
// EPB value, then RBP is restored by popping off the stack, and the return
// is done by popping the stack once more into the pc.
// All non-volatile registers that need to be restored must have been saved
// in a small range in the stack that starts RBP-8 to RBP-1020. The offset/4
// is encoded in the UNWIND_X86_64_RBP_FRAME_OFFSET bits. The registers saved
// are encoded in the UNWIND_X86_64_RBP_FRAME_REGISTERS bits as five 3-bit entries.
// Each entry contains which register to restore.
// UNWIND_X86_64_MODE_STACK_IMMD:
// A "frameless" (RBP not used as frame pointer) function with a small
// constant stack size. To return, a constant (encoded in the compact
// unwind encoding) is added to the RSP. Then the return is done by
// popping the stack into the pc.
// All non-volatile registers that need to be restored must have been saved
// on the stack immediately after the return address. The stack_size/4 is
// encoded in the UNWIND_X86_64_FRAMELESS_STACK_SIZE (max stack size is 1024).
// The number of registers saved is encoded in UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT.
// UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION constains which registers were
// saved and their order.
// UNWIND_X86_64_MODE_STACK_IND:
// A "frameless" (RBP not used as frame pointer) function large constant
// stack size. This case is like the previous, except the stack size is too
// large to encode in the compact unwind encoding. Instead it requires that
// the function contains "subq $nnnnnnnn,RSP" in its prolog. The compact
// encoding contains the offset to the nnnnnnnn value in the function in
// UNWIND_X86_64_FRAMELESS_STACK_SIZE.
// UNWIND_X86_64_MODE_DWARF:
// No compact unwind encoding is available. Instead the low 24-bits of the
// compact encoding is the offset of the dwarf FDE in the __eh_frame section.
// This mode is never used in object files. It is only generated by the
// linker in final linked images which have only dwarf unwind info for a
// function.
//
#ifndef __OPEN_SOURCE__
// ARM64
//
// 1-bit: start
// 1-bit: has lsda
// 2-bit: personality index
//
// 4-bits: 4=frame-based, 2=frameless, 3=dwarf
// frameless:
// 12-bits of stack size
// frame-based:
// 4-bits D reg pairs saved
// 5-bits X reg pairs saved
// dwarf:
// 24-bits offset of dwarf FDE in __eh_frame section
//
enum {
UNWIND_ARM64_MODE_MASK = 0x0F000000,
UNWIND_ARM64_MODE_FRAMELESS = 0x02000000,
UNWIND_ARM64_MODE_DWARF = 0x03000000,
UNWIND_ARM64_MODE_FRAME = 0x04000000,
UNWIND_ARM64_FRAME_X19_X20_PAIR = 0x00000001,
UNWIND_ARM64_FRAME_X21_X22_PAIR = 0x00000002,
UNWIND_ARM64_FRAME_X23_X24_PAIR = 0x00000004,
UNWIND_ARM64_FRAME_X25_X26_PAIR = 0x00000008,
UNWIND_ARM64_FRAME_X27_X28_PAIR = 0x00000010,
UNWIND_ARM64_FRAME_D8_D9_PAIR = 0x00000100,
UNWIND_ARM64_FRAME_D10_D11_PAIR = 0x00000200,
UNWIND_ARM64_FRAME_D12_D13_PAIR = 0x00000400,
UNWIND_ARM64_FRAME_D14_D15_PAIR = 0x00000800,
UNWIND_ARM64_FRAME_X21_X22_PAIR_OLD = 0x00000001,
UNWIND_ARM64_FRAME_X23_X24_PAIR_OLD = 0x00000002,
UNWIND_ARM64_FRAME_X25_X26_PAIR_OLD = 0x00000004,
UNWIND_ARM64_FRAME_X27_X28_PAIR_OLD = 0x00000008,
UNWIND_ARM64_FRAME_D8_D9_PAIR_OLD = 0x00000010,
UNWIND_ARM64_FRAME_D10_D11_PAIR_OLD = 0x00000020,
UNWIND_ARM64_FRAME_D12_D13_PAIR_OLD = 0x00000040,
UNWIND_ARM64_FRAME_D14_D15_PAIR_OLD = 0x00000080,
UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK = 0x00FFF000,
UNWIND_ARM64_DWARF_SECTION_OFFSET = 0x00FFFFFF,
};
// For arm64 there are three modes for the compact unwind encoding:
// UNWIND_ARM64_MODE_FRAME:
// This is a standard arm64 prolog where FP/LR are immediately pushed on the
// stack, then SP is copied to FP. If there are any non-volatile registers
// saved, then are copied into the stack frame in pairs in a contiguous
// range right below the saved FP/LR pair. Any subset of the five X pairs
// and four D pairs can be saved, but the memory layout must be in register
// number order.
// UNWIND_ARM64_MODE_FRAMELESS:
// A "frameless" leaf function, where FP/LR are not saved. The return address
// remains in LR throughout the function. If any non-volatile registers
// are saved, they must be pushed onto the stack before any stack space is
// allocated for local variables. The stack sized (including any saved
// non-volatile registers) divided by 16 is encoded in the bits
// UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK.
// UNWIND_ARM64_MODE_DWARF:
// No compact unwind encoding is available. Instead the low 24-bits of the
// compact encoding is the offset of the dwarf FDE in the __eh_frame section.
// This mode is never used in object files. It is only generated by the
// linker in final linked images which have only dwarf unwind info for a
// function.
//
#endif // __OPEN_SOURCE__
////////////////////////////////////////////////////////////////////////////////
//
// Relocatable Object Files: __LD,__compact_unwind
//
////////////////////////////////////////////////////////////////////////////////
//
// A compiler can generated compact unwind information for a function by adding
// a "row" to the __LD,__compact_unwind section. This section has the
// S_ATTR_DEBUG bit set, so the section will be ignored by older linkers.
// It is removed by the new linker, so never ends up in final executables.
// This section is a table, initially with one row per function (that needs
// unwind info). The table columns and some conceptual entries are:
//
// range-start pointer to start of function/range
// range-length
// compact-unwind-encoding 32-bit encoding
// personality-function or zero if no personality function
// lsda or zero if no LSDA data
//
// The length and encoding fields are 32-bits. The other are all pointer sized.
//
// In x86_64 assembly, these entry would look like:
//
// .section __LD,__compact_unwind,regular,debug
//
// #compact unwind for _foo
// .quad _foo
// .set L1,LfooEnd-_foo
// .long L1
// .long 0x01010001
// .quad 0
// .quad 0
//
// #compact unwind for _bar
// .quad _bar
// .set L2,LbarEnd-_bar
// .long L2
// .long 0x01020011
// .quad __gxx_personality
// .quad except_tab1
//
//
// Notes: There is no need for any labels in the the __compact_unwind section.
// The use of the .set directive is to force the evaluation of the
// range-length at assembly time, instead of generating relocations.
//
// To support future compiler optimizations where which non-volatile registers
// are saved changes within a function (e.g. delay saving non-volatiles until
// necessary), there can by multiple lines in the __compact_unwind table for one
// function, each with a different (non-overlapping) range and each with
// different compact unwind encodings that correspond to the non-volatiles
// saved at that range of the function.
//
// If a particular function is so wacky that there is no compact unwind way
// to encode it, then the compiler can emit traditional dwarf unwind info.
// The runtime will use which ever is available.
//
// Runtime support for compact unwind encodings are only available on 10.6
// and later. So, the compiler should not generate it when targeting pre-10.6.
////////////////////////////////////////////////////////////////////////////////
//
// Final Linked Images: __TEXT,__unwind_info
//
////////////////////////////////////////////////////////////////////////////////
//
// The __TEXT,__unwind_info section is laid out for an efficient two level lookup.
// The header of the section contains a coarse index that maps function address
// to the page (4096 byte block) containing the unwind info for that function.
//
#define UNWIND_SECTION_VERSION 1
struct unwind_info_section_header
{
uint32_t version; // UNWIND_SECTION_VERSION
uint32_t commonEncodingsArraySectionOffset;
uint32_t commonEncodingsArrayCount;
uint32_t personalityArraySectionOffset;
uint32_t personalityArrayCount;
uint32_t indexSectionOffset;
uint32_t indexCount;
// compact_unwind_encoding_t[]
// uintptr_t personalities[]
// unwind_info_section_header_index_entry[]
// unwind_info_section_header_lsda_index_entry[]
};
struct unwind_info_section_header_index_entry
{
uint32_t functionOffset;
uint32_t secondLevelPagesSectionOffset; // section offset to start of regular or compress page
uint32_t lsdaIndexArraySectionOffset; // section offset to start of lsda_index array for this range
};
struct unwind_info_section_header_lsda_index_entry
{
uint32_t functionOffset;
uint32_t lsdaOffset;
};
//
// There are two kinds of second level index pages: regular and compressed.
// A compressed page can hold up to 1021 entries, but it cannot be used
// if too many different encoding types are used. The regular page holds
// 511 entries.
//
struct unwind_info_regular_second_level_entry
{
uint32_t functionOffset;
compact_unwind_encoding_t encoding;
};
#define UNWIND_SECOND_LEVEL_REGULAR 2
struct unwind_info_regular_second_level_page_header
{
uint32_t kind; // UNWIND_SECOND_LEVEL_REGULAR
uint16_t entryPageOffset;
uint16_t entryCount;
// entry array
};
#define UNWIND_SECOND_LEVEL_COMPRESSED 3
struct unwind_info_compressed_second_level_page_header
{
uint32_t kind; // UNWIND_SECOND_LEVEL_COMPRESSED
uint16_t entryPageOffset;
uint16_t entryCount;
uint16_t encodingsPageOffset;
uint16_t encodingsCount;
// 32-bit entry array
// encodings array
};
#define UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(entry) (entry & 0x00FFFFFF)
#define UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(entry) ((entry >> 24) & 0xFF)
#endif

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//===------------------------------- unwind.h -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// C++ ABI Level 1 ABI documented at:
// http://mentorembedded.github.io/cxx-abi/abi-eh.html
//
//===----------------------------------------------------------------------===//
#ifndef __UNWIND_H__
#define __UNWIND_H__
#include <stdint.h>
#include <stddef.h>
typedef enum {
_URC_NO_REASON = 0,
_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
_URC_FATAL_PHASE2_ERROR = 2,
_URC_FATAL_PHASE1_ERROR = 3,
_URC_NORMAL_STOP = 4,
_URC_END_OF_STACK = 5,
_URC_HANDLER_FOUND = 6,
_URC_INSTALL_CONTEXT = 7,
_URC_CONTINUE_UNWIND = 8
} _Unwind_Reason_Code;
typedef enum {
_UA_SEARCH_PHASE = 1,
_UA_CLEANUP_PHASE = 2,
_UA_HANDLER_FRAME = 4,
_UA_FORCE_UNWIND = 8,
_UA_END_OF_STACK = 16 // gcc extension to C++ ABI
} _Unwind_Action;
struct _Unwind_Context; // opaque
struct _Unwind_Exception; // forward declaration
struct _Unwind_Exception {
uint64_t exception_class;
void (*exception_cleanup)(_Unwind_Reason_Code reason,
struct _Unwind_Exception *exc);
uintptr_t private_1; // non-zero means forced unwind
uintptr_t private_2; // holds sp that phase1 found for phase2 to use
#if !__LP64__
// The gcc implementation of _Unwind_Exception used attribute mode on the
// above fields which had the side effect of causing this whole struct to
// round up to 32 bytes in size. To be more explicit, we add pad fields
// added for binary compatibility.
uint32_t reserved[3];
#endif
};
typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
(int version,
_Unwind_Action actions,
uint64_t exceptionClass,
struct _Unwind_Exception* exceptionObject,
struct _Unwind_Context* context,
void* stop_parameter );
typedef _Unwind_Reason_Code (*__personality_routine)
(int version,
_Unwind_Action actions,
uint64_t exceptionClass,
struct _Unwind_Exception* exceptionObject,
struct _Unwind_Context* context);
#ifdef __cplusplus
extern "C" {
#endif
//
// The following are the base functions documented by the C++ ABI
//
#if __arm__
extern _Unwind_Reason_Code
_Unwind_SjLj_RaiseException(struct _Unwind_Exception *exception_object);
extern void _Unwind_SjLj_Resume(struct _Unwind_Exception *exception_object);
#else
extern _Unwind_Reason_Code
_Unwind_RaiseException(struct _Unwind_Exception *exception_object);
extern void _Unwind_Resume(struct _Unwind_Exception *exception_object);
#endif
extern void _Unwind_DeleteException(struct _Unwind_Exception *exception_object);
extern uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, int index);
extern void _Unwind_SetGR(struct _Unwind_Context *context, int index,
uintptr_t new_value);
extern uintptr_t _Unwind_GetIP(struct _Unwind_Context *context);
extern void _Unwind_SetIP(struct _Unwind_Context *, uintptr_t new_value);
extern uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context *context);
extern uintptr_t
_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context);
#if __arm__
extern _Unwind_Reason_Code
_Unwind_SjLj_ForcedUnwind(struct _Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter);
#else
extern _Unwind_Reason_Code
_Unwind_ForcedUnwind(struct _Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter);
#endif
#if __arm__
typedef struct _Unwind_FunctionContext *_Unwind_FunctionContext_t;
extern void _Unwind_SjLj_Register(_Unwind_FunctionContext_t fc);
extern void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t fc);
#endif
//
// The following are semi-suppoted extensions to the C++ ABI
//
//
// called by __cxa_rethrow().
//
#if __arm__
extern _Unwind_Reason_Code
_Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception *exception_object);
#else
extern _Unwind_Reason_Code
_Unwind_Resume_or_Rethrow(struct _Unwind_Exception *exception_object);
#endif
// _Unwind_Backtrace() is a gcc extension that walks the stack and calls the
// _Unwind_Trace_Fn once per frame until it reaches the bottom of the stack
// or the _Unwind_Trace_Fn function returns something other than _URC_NO_REASON.
typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *,
void *);
extern _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *);
// _Unwind_GetCFA is a gcc extension that can be called from within a
// personality handler to get the CFA (stack pointer before call) of
// current frame.
extern uintptr_t _Unwind_GetCFA(struct _Unwind_Context *);
// _Unwind_GetIPInfo is a gcc extension that can be called from within a
// personality handler. Similar to _Unwind_GetIP() but also returns in
// *ipBefore a non-zero value if the instruction pointer is at or before the
// instruction causing the unwind. Normally, in a function call, the IP returned
// is the return address which is after the call instruction and may be past the
// end of the function containing the call instruction.
extern uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context,
int *ipBefore);
// __register_frame() is used with dynamically generated code to register the
// FDE for a generated (JIT) code. The FDE must use pc-rel addressing to point
// to its function and optional LSDA.
// __register_frame() has existed in all versions of Mac OS X, but in 10.4 and
// 10.5 it was buggy and did not actually register the FDE with the unwinder.
// In 10.6 and later it does register properly.
extern void __register_frame(const void *fde);
extern void __deregister_frame(const void *fde);
// _Unwind_Find_FDE() will locate the FDE if the pc is in some function that has
// an associated FDE. Note, Mac OS X 10.6 and later, introduces "compact unwind
// info" which the runtime uses in preference to dwarf unwind info. This
// function will only work if the target function has an FDE but no compact
// unwind info.
struct dwarf_eh_bases {
uintptr_t tbase;
uintptr_t dbase;
uintptr_t func;
};
extern const void *_Unwind_Find_FDE(const void *pc, struct dwarf_eh_bases *);
// This function attempts to find the start (address of first instruction) of
// a function given an address inside the function. It only works if the
// function has an FDE (dwarf unwind info).
// This function is unimplemented on Mac OS X 10.6 and later. Instead, use
// _Unwind_Find_FDE() and look at the dwarf_eh_bases.func result.
extern void *_Unwind_FindEnclosingFunction(void *pc);
// Mac OS X does not support text-rel and data-rel addressing so these functions
// are unimplemented
extern uintptr_t _Unwind_GetDataRelBase(struct _Unwind_Context *context)
__attribute__((unavailable));
extern uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context *context)
__attribute__((unavailable));
// Mac OS X 10.4 and 10.5 had implementations of these functions in
// libgcc_s.dylib, but they never worked.
/// These functions are no longer available on Mac OS X.
extern void __register_frame_info_bases(const void *fde, void *ob, void *tb,
void *db) __attribute__((unavailable));
extern void __register_frame_info(const void *fde, void *ob)
__attribute__((unavailable));
extern void __register_frame_info_table_bases(const void *fde, void *ob,
void *tb, void *db)
__attribute__((unavailable));
extern void __register_frame_info_table(const void *fde, void *ob)
__attribute__((unavailable));
extern void __register_frame_table(const void *fde)
__attribute__((unavailable));
extern void *__deregister_frame_info(const void *fde)
__attribute__((unavailable));
extern void *__deregister_frame_info_bases(const void *fde)
__attribute__((unavailable));
#ifdef __cplusplus
}
#endif
#endif // __UNWIND_H__

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//===------------------------- AddressSpace.hpp ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Abstracts accessing local vs remote address spaces.
//
//===----------------------------------------------------------------------===//
#ifndef __ADDRESSSPACE_HPP__
#define __ADDRESSSPACE_HPP__
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#if __APPLE__
#include <mach-o/dyld_priv.h>
namespace libunwind {
bool checkKeyMgrRegisteredFDEs(uintptr_t targetAddr, void *&fde);
}
#endif
#include "libunwind.h"
#include "config.h"
#include "dwarf2.h"
#include "Registers.hpp"
namespace libunwind {
/// Used by findUnwindSections() to return info about needed sections.
struct UnwindInfoSections {
uintptr_t dso_base;
#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
uintptr_t dwarf_section;
uintptr_t dwarf_section_length;
#endif
#if _LIBUNWIND_SUPPORT_DWARF_INDEX
uintptr_t dwarf_index_section;
uintptr_t dwarf_index_section_length;
#endif
#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
uintptr_t compact_unwind_section;
uintptr_t compact_unwind_section_length;
#endif
};
/// LocalAddressSpace is used as a template parameter to UnwindCursor when
/// unwinding a thread in the same process. The wrappers compile away,
/// making local unwinds fast.
class __attribute__((visibility("hidden"))) LocalAddressSpace {
public:
#if __LP64__
typedef uint64_t pint_t;
typedef int64_t sint_t;
#else
typedef uint32_t pint_t;
typedef int32_t sint_t;
#endif
uint8_t get8(pint_t addr) { return *((uint8_t *)addr); }
uint16_t get16(pint_t addr) { return *((uint16_t *)addr); }
uint32_t get32(pint_t addr) { return *((uint32_t *)addr); }
uint64_t get64(pint_t addr) { return *((uint64_t *)addr); }
double getDouble(pint_t addr) { return *((double *)addr); }
v128 getVector(pint_t addr) { return *((v128 *)addr); }
uintptr_t getP(pint_t addr);
static uint64_t getULEB128(pint_t &addr, pint_t end);
static int64_t getSLEB128(pint_t &addr, pint_t end);
pint_t getEncodedP(pint_t &addr, pint_t end, uint8_t encoding);
bool findFunctionName(pint_t addr, char *buf, size_t bufLen,
unw_word_t *offset);
bool findUnwindSections(pint_t targetAddr, UnwindInfoSections &info);
bool findOtherFDE(pint_t targetAddr, pint_t &fde);
static LocalAddressSpace sThisAddressSpace;
};
inline uintptr_t LocalAddressSpace::getP(pint_t addr) {
#if __LP64__
return get64(addr);
#else
return get32(addr);
#endif
}
/// Read a ULEB128 into a 64-bit word.
inline uint64_t LocalAddressSpace::getULEB128(pint_t &addr, pint_t end) {
const uint8_t *p = (uint8_t *)addr;
const uint8_t *pend = (uint8_t *)end;
uint64_t result = 0;
int bit = 0;
do {
uint64_t b;
if (p == pend)
_LIBUNWIND_ABORT("truncated uleb128 expression");
b = *p & 0x7f;
if (bit >= 64 || b << bit >> bit != b) {
_LIBUNWIND_ABORT("malformed uleb128 expression");
} else {
result |= b << bit;
bit += 7;
}
} while (*p++ >= 0x80);
addr = (pint_t) p;
return result;
}
/// Read a SLEB128 into a 64-bit word.
inline int64_t LocalAddressSpace::getSLEB128(pint_t &addr, pint_t end) {
const uint8_t *p = (uint8_t *)addr;
const uint8_t *pend = (uint8_t *)end;
int64_t result = 0;
int bit = 0;
uint8_t byte;
do {
if (p == pend)
_LIBUNWIND_ABORT("truncated sleb128 expression");
byte = *p++;
result |= ((byte & 0x7f) << bit);
bit += 7;
} while (byte & 0x80);
// sign extend negative numbers
if ((byte & 0x40) != 0)
result |= (-1LL) << bit;
addr = (pint_t) p;
return result;
}
inline LocalAddressSpace::pint_t LocalAddressSpace::getEncodedP(pint_t &addr,
pint_t end,
uint8_t encoding) {
pint_t startAddr = addr;
const uint8_t *p = (uint8_t *)addr;
pint_t result;
// first get value
switch (encoding & 0x0F) {
case DW_EH_PE_ptr:
result = getP(addr);
p += sizeof(pint_t);
addr = (pint_t) p;
break;
case DW_EH_PE_uleb128:
result = (pint_t)getULEB128(addr, end);
break;
case DW_EH_PE_udata2:
result = get16(addr);
p += 2;
addr = (pint_t) p;
break;
case DW_EH_PE_udata4:
result = get32(addr);
p += 4;
addr = (pint_t) p;
break;
case DW_EH_PE_udata8:
result = (pint_t)get64(addr);
p += 8;
addr = (pint_t) p;
break;
case DW_EH_PE_sleb128:
result = (pint_t)getSLEB128(addr, end);
break;
case DW_EH_PE_sdata2:
result = (uint16_t)get16(addr);
p += 2;
addr = (pint_t) p;
break;
case DW_EH_PE_sdata4:
result = (uint32_t)get32(addr);
p += 4;
addr = (pint_t) p;
break;
case DW_EH_PE_sdata8:
result = (pint_t)get64(addr);
p += 8;
addr = (pint_t) p;
break;
default:
_LIBUNWIND_ABORT("unknown pointer encoding");
}
// then add relative offset
switch (encoding & 0x70) {
case DW_EH_PE_absptr:
// do nothing
break;
case DW_EH_PE_pcrel:
result += startAddr;
break;
case DW_EH_PE_textrel:
_LIBUNWIND_ABORT("DW_EH_PE_textrel pointer encoding not supported");
break;
case DW_EH_PE_datarel:
_LIBUNWIND_ABORT("DW_EH_PE_datarel pointer encoding not supported");
break;
case DW_EH_PE_funcrel:
_LIBUNWIND_ABORT("DW_EH_PE_funcrel pointer encoding not supported");
break;
case DW_EH_PE_aligned:
_LIBUNWIND_ABORT("DW_EH_PE_aligned pointer encoding not supported");
break;
default:
_LIBUNWIND_ABORT("unknown pointer encoding");
break;
}
if (encoding & DW_EH_PE_indirect)
result = getP(result);
return result;
}
inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
UnwindInfoSections &info) {
#if __APPLE__
dyld_unwind_sections dyldInfo;
if (_dyld_find_unwind_sections((void *)targetAddr, &dyldInfo)) {
info.dso_base = (uintptr_t)dyldInfo.mh;
#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
info.dwarf_section = (uintptr_t)dyldInfo.dwarf_section;
info.dwarf_section_length = dyldInfo.dwarf_section_length;
#endif
info.compact_unwind_section = (uintptr_t)dyldInfo.compact_unwind_section;
info.compact_unwind_section_length = dyldInfo.compact_unwind_section_length;
return true;
}
#else
// TO DO
#endif
return false;
}
inline bool LocalAddressSpace::findOtherFDE(pint_t targetAddr, pint_t &fde) {
#if __APPLE__
return checkKeyMgrRegisteredFDEs(targetAddr, *((void**)&fde));
#else
// TO DO: if OS has way to dynamically register FDEs, check that.
return false;
#endif
}
inline bool LocalAddressSpace::findFunctionName(pint_t addr, char *buf,
size_t bufLen,
unw_word_t *offset) {
dl_info dyldInfo;
if (dladdr((void *)addr, &dyldInfo)) {
if (dyldInfo.dli_sname != NULL) {
strlcpy(buf, dyldInfo.dli_sname, bufLen);
*offset = (addr - (pint_t) dyldInfo.dli_saddr);
return true;
}
}
return false;
}
#if UNW_REMOTE
/// OtherAddressSpace is used as a template parameter to UnwindCursor when
/// unwinding a thread in the another process. The other process can be a
/// different endianness and a different pointer size which is handled by
/// the P template parameter.
template <typename P>
class OtherAddressSpace {
public:
OtherAddressSpace(task_t task) : fTask(task) {}
typedef typename P::uint_t pint_t;
uint8_t get8(pint_t addr);
uint16_t get16(pint_t addr);
uint32_t get32(pint_t addr);
uint64_t get64(pint_t addr);
pint_t getP(pint_t addr);
uint64_t getULEB128(pint_t &addr, pint_t end);
int64_t getSLEB128(pint_t &addr, pint_t end);
pint_t getEncodedP(pint_t &addr, pint_t end, uint8_t encoding);
bool findFunctionName(pint_t addr, char *buf, size_t bufLen,
unw_word_t *offset);
bool findUnwindSections(pint_t targetAddr, UnwindInfoSections &info);
bool findOtherFDE(pint_t targetAddr, pint_t &fde);
private:
void *localCopy(pint_t addr);
task_t fTask;
};
template <typename P> uint8_t OtherAddressSpace<P>::get8(pint_t addr) {
return *((uint8_t *)localCopy(addr));
}
template <typename P> uint16_t OtherAddressSpace<P>::get16(pint_t addr) {
return P::E::get16(*(uint16_t *)localCopy(addr));
}
template <typename P> uint32_t OtherAddressSpace<P>::get32(pint_t addr) {
return P::E::get32(*(uint32_t *)localCopy(addr));
}
template <typename P> uint64_t OtherAddressSpace<P>::get64(pint_t addr) {
return P::E::get64(*(uint64_t *)localCopy(addr));
}
template <typename P>
typename P::uint_t OtherAddressSpace<P>::getP(pint_t addr) {
return P::getP(*(uint64_t *)localCopy(addr));
}
template <typename P>
uint64_t OtherAddressSpace<P>::getULEB128(pint_t &addr, pint_t end) {
uintptr_t size = (end - addr);
LocalAddressSpace::pint_t laddr = (LocalAddressSpace::pint_t) localCopy(addr);
LocalAddressSpace::pint_t sladdr = laddr;
uint64_t result = LocalAddressSpace::getULEB128(laddr, laddr + size);
addr += (laddr - sladdr);
return result;
}
template <typename P>
int64_t OtherAddressSpace<P>::getSLEB128(pint_t &addr, pint_t end) {
uintptr_t size = (end - addr);
LocalAddressSpace::pint_t laddr = (LocalAddressSpace::pint_t) localCopy(addr);
LocalAddressSpace::pint_t sladdr = laddr;
uint64_t result = LocalAddressSpace::getSLEB128(laddr, laddr + size);
addr += (laddr - sladdr);
return result;
}
template <typename P> void *OtherAddressSpace<P>::localCopy(pint_t addr) {
// FIX ME
}
template <typename P>
bool OtherAddressSpace<P>::findFunctionName(pint_t addr, char *buf,
size_t bufLen, unw_word_t *offset) {
// FIX ME
}
/// unw_addr_space is the base class that abstract unw_addr_space_t type in
/// libunwind.h points to.
struct unw_addr_space {
cpu_type_t cpuType;
task_t taskPort;
};
/// unw_addr_space_i386 is the concrete instance that a unw_addr_space_t points
/// to when examining
/// a 32-bit intel process.
struct unw_addr_space_i386 : public unw_addr_space {
unw_addr_space_i386(task_t task) : oas(task) {}
OtherAddressSpace<Pointer32<LittleEndian> > oas;
};
/// unw_addr_space_x86_64 is the concrete instance that a unw_addr_space_t
/// points to when examining
/// a 64-bit intel process.
struct unw_addr_space_x86_64 : public unw_addr_space {
unw_addr_space_x86_64(task_t task) : oas(task) {}
OtherAddressSpace<Pointer64<LittleEndian> > oas;
};
/// unw_addr_space_ppc is the concrete instance that a unw_addr_space_t points
/// to when examining
/// a 32-bit PowerPC process.
struct unw_addr_space_ppc : public unw_addr_space {
unw_addr_space_ppc(task_t task) : oas(task) {}
OtherAddressSpace<Pointer32<BigEndian> > oas;
};
#endif // UNW_REMOTE
} // namespace libunwind
#endif // __ADDRESSSPACE_HPP__

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//===-------------------------- CompactUnwinder.hpp -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Does runtime stack unwinding using compact unwind encodings.
//
//===----------------------------------------------------------------------===//
#ifndef __COMPACT_UNWINDER_HPP__
#define __COMPACT_UNWINDER_HPP__
#include <stdint.h>
#include <stdlib.h>
#include <libunwind.h>
#include <mach-o/compact_unwind_encoding.h>
#include "AddressSpace.hpp"
#include "Registers.hpp"
#define EXTRACT_BITS(value, mask) \
((value >> __builtin_ctz(mask)) & (((1 << __builtin_popcount(mask))) - 1))
namespace libunwind {
/// CompactUnwinder_x86 uses a compact unwind info to virtually "step" (aka
/// unwind) by modifying a Registers_x86 register set
template <typename A>
class CompactUnwinder_x86 {
public:
static int stepWithCompactEncoding(compact_unwind_encoding_t info,
uint32_t functionStart, A &addressSpace,
Registers_x86 &registers);
private:
typename A::pint_t pint_t;
static void frameUnwind(A &addressSpace, Registers_x86 &registers);
static void framelessUnwind(A &addressSpace,
typename A::pint_t returnAddressLocation,
Registers_x86 &registers);
static int
stepWithCompactEncodingEBPFrame(compact_unwind_encoding_t compactEncoding,
uint32_t functionStart, A &addressSpace,
Registers_x86 &registers);
static int stepWithCompactEncodingFrameless(
compact_unwind_encoding_t compactEncoding, uint32_t functionStart,
A &addressSpace, Registers_x86 &registers, bool indirectStackSize);
};
template <typename A>
int CompactUnwinder_x86<A>::stepWithCompactEncoding(
compact_unwind_encoding_t compactEncoding, uint32_t functionStart,
A &addressSpace, Registers_x86 &registers) {
switch (compactEncoding & UNWIND_X86_MODE_MASK) {
case UNWIND_X86_MODE_EBP_FRAME:
return stepWithCompactEncodingEBPFrame(compactEncoding, functionStart,
addressSpace, registers);
case UNWIND_X86_MODE_STACK_IMMD:
return stepWithCompactEncodingFrameless(compactEncoding, functionStart,
addressSpace, registers, false);
case UNWIND_X86_MODE_STACK_IND:
return stepWithCompactEncodingFrameless(compactEncoding, functionStart,
addressSpace, registers, true);
}
_LIBUNWIND_ABORT("invalid compact unwind encoding");
}
template <typename A>
int CompactUnwinder_x86<A>::stepWithCompactEncodingEBPFrame(
compact_unwind_encoding_t compactEncoding, uint32_t functionStart,
A &addressSpace, Registers_x86 &registers) {
uint32_t savedRegistersOffset =
EXTRACT_BITS(compactEncoding, UNWIND_X86_EBP_FRAME_OFFSET);
uint32_t savedRegistersLocations =
EXTRACT_BITS(compactEncoding, UNWIND_X86_EBP_FRAME_REGISTERS);
uint32_t savedRegisters = registers.getEBP() - 4 * savedRegistersOffset;
for (int i = 0; i < 5; ++i) {
switch (savedRegistersLocations & 0x7) {
case UNWIND_X86_REG_NONE:
// no register saved in this slot
break;
case UNWIND_X86_REG_EBX:
registers.setEBX(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_ECX:
registers.setECX(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_EDX:
registers.setEDX(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_EDI:
registers.setEDI(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_ESI:
registers.setESI(addressSpace.get32(savedRegisters));
break;
default:
(void)functionStart;
_LIBUNWIND_DEBUG_LOG("bad register for EBP frame, encoding=%08X for "
"function starting at 0x%X\n",
compactEncoding, functionStart);
_LIBUNWIND_ABORT("invalid compact unwind encoding");
}
savedRegisters += 4;
savedRegistersLocations = (savedRegistersLocations >> 3);
}
frameUnwind(addressSpace, registers);
return UNW_STEP_SUCCESS;
}
template <typename A>
int CompactUnwinder_x86<A>::stepWithCompactEncodingFrameless(
compact_unwind_encoding_t encoding, uint32_t functionStart,
A &addressSpace, Registers_x86 &registers, bool indirectStackSize) {
uint32_t stackSizeEncoded =
EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_SIZE);
uint32_t stackAdjust =
EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_ADJUST);
uint32_t regCount =
EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_REG_COUNT);
uint32_t permutation =
EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION);
uint32_t stackSize = stackSizeEncoded * 4;
if (indirectStackSize) {
// stack size is encoded in subl $xxx,%esp instruction
uint32_t subl = addressSpace.get32(functionStart + stackSizeEncoded);
stackSize = subl + 4 * stackAdjust;
}
// decompress permutation
uint32_t permunreg[6];
switch (regCount) {
case 6:
permunreg[0] = permutation / 120;
permutation -= (permunreg[0] * 120);
permunreg[1] = permutation / 24;
permutation -= (permunreg[1] * 24);
permunreg[2] = permutation / 6;
permutation -= (permunreg[2] * 6);
permunreg[3] = permutation / 2;
permutation -= (permunreg[3] * 2);
permunreg[4] = permutation;
permunreg[5] = 0;
break;
case 5:
permunreg[0] = permutation / 120;
permutation -= (permunreg[0] * 120);
permunreg[1] = permutation / 24;
permutation -= (permunreg[1] * 24);
permunreg[2] = permutation / 6;
permutation -= (permunreg[2] * 6);
permunreg[3] = permutation / 2;
permutation -= (permunreg[3] * 2);
permunreg[4] = permutation;
break;
case 4:
permunreg[0] = permutation / 60;
permutation -= (permunreg[0] * 60);
permunreg[1] = permutation / 12;
permutation -= (permunreg[1] * 12);
permunreg[2] = permutation / 3;
permutation -= (permunreg[2] * 3);
permunreg[3] = permutation;
break;
case 3:
permunreg[0] = permutation / 20;
permutation -= (permunreg[0] * 20);
permunreg[1] = permutation / 4;
permutation -= (permunreg[1] * 4);
permunreg[2] = permutation;
break;
case 2:
permunreg[0] = permutation / 5;
permutation -= (permunreg[0] * 5);
permunreg[1] = permutation;
break;
case 1:
permunreg[0] = permutation;
break;
}
// re-number registers back to standard numbers
int registersSaved[6];
bool used[7] = { false, false, false, false, false, false, false };
for (uint32_t i = 0; i < regCount; ++i) {
uint32_t renum = 0;
for (int u = 1; u < 7; ++u) {
if (!used[u]) {
if (renum == permunreg[i]) {
registersSaved[i] = u;
used[u] = true;
break;
}
++renum;
}
}
}
uint32_t savedRegisters = registers.getSP() + stackSize - 4 - 4 * regCount;
for (uint32_t i = 0; i < regCount; ++i) {
switch (registersSaved[i]) {
case UNWIND_X86_REG_EBX:
registers.setEBX(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_ECX:
registers.setECX(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_EDX:
registers.setEDX(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_EDI:
registers.setEDI(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_ESI:
registers.setESI(addressSpace.get32(savedRegisters));
break;
case UNWIND_X86_REG_EBP:
registers.setEBP(addressSpace.get32(savedRegisters));
break;
default:
_LIBUNWIND_DEBUG_LOG("bad register for frameless, encoding=%08X for "
"function starting at 0x%X\n",
encoding, functionStart);
_LIBUNWIND_ABORT("invalid compact unwind encoding");
}
savedRegisters += 4;
}
framelessUnwind(addressSpace, savedRegisters, registers);
return UNW_STEP_SUCCESS;
}
template <typename A>
void CompactUnwinder_x86<A>::frameUnwind(A &addressSpace,
Registers_x86 &registers) {
typename A::pint_t bp = registers.getEBP();
// ebp points to old ebp
registers.setEBP(addressSpace.get32(bp));
// old esp is ebp less saved ebp and return address
registers.setSP((uint32_t)bp + 8);
// pop return address into eip
registers.setIP(addressSpace.get32(bp + 4));
}
template <typename A>
void CompactUnwinder_x86<A>::framelessUnwind(
A &addressSpace, typename A::pint_t returnAddressLocation,
Registers_x86 &registers) {
// return address is on stack after last saved register
registers.setIP(addressSpace.get32(returnAddressLocation));
// old esp is before return address
registers.setSP((uint32_t)returnAddressLocation + 4);
}
/// CompactUnwinder_x86_64 uses a compact unwind info to virtually "step" (aka
/// unwind) by modifying a Registers_x86_64 register set
template <typename A>
class CompactUnwinder_x86_64 {
public:
static int stepWithCompactEncoding(compact_unwind_encoding_t compactEncoding,
uint64_t functionStart, A &addressSpace,
Registers_x86_64 &registers);
private:
typename A::pint_t pint_t;
static void frameUnwind(A &addressSpace, Registers_x86_64 &registers);
static void framelessUnwind(A &addressSpace, uint64_t returnAddressLocation,
Registers_x86_64 &registers);
static int
stepWithCompactEncodingRBPFrame(compact_unwind_encoding_t compactEncoding,
uint64_t functionStart, A &addressSpace,
Registers_x86_64 &registers);
static int stepWithCompactEncodingFrameless(
compact_unwind_encoding_t compactEncoding, uint64_t functionStart,
A &addressSpace, Registers_x86_64 &registers, bool indirectStackSize);
};
template <typename A>
int CompactUnwinder_x86_64<A>::stepWithCompactEncoding(
compact_unwind_encoding_t compactEncoding, uint64_t functionStart,
A &addressSpace, Registers_x86_64 &registers) {
switch (compactEncoding & UNWIND_X86_64_MODE_MASK) {
case UNWIND_X86_64_MODE_RBP_FRAME:
return stepWithCompactEncodingRBPFrame(compactEncoding, functionStart,
addressSpace, registers);
case UNWIND_X86_64_MODE_STACK_IMMD:
return stepWithCompactEncodingFrameless(compactEncoding, functionStart,
addressSpace, registers, false);
case UNWIND_X86_64_MODE_STACK_IND:
return stepWithCompactEncodingFrameless(compactEncoding, functionStart,
addressSpace, registers, true);
}
_LIBUNWIND_ABORT("invalid compact unwind encoding");
}
template <typename A>
int CompactUnwinder_x86_64<A>::stepWithCompactEncodingRBPFrame(
compact_unwind_encoding_t compactEncoding, uint64_t functionStart,
A &addressSpace, Registers_x86_64 &registers) {
uint32_t savedRegistersOffset =
EXTRACT_BITS(compactEncoding, UNWIND_X86_64_RBP_FRAME_OFFSET);
uint32_t savedRegistersLocations =
EXTRACT_BITS(compactEncoding, UNWIND_X86_64_RBP_FRAME_REGISTERS);
uint64_t savedRegisters = registers.getRBP() - 8 * savedRegistersOffset;
for (int i = 0; i < 5; ++i) {
switch (savedRegistersLocations & 0x7) {
case UNWIND_X86_64_REG_NONE:
// no register saved in this slot
break;
case UNWIND_X86_64_REG_RBX:
registers.setRBX(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R12:
registers.setR12(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R13:
registers.setR13(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R14:
registers.setR14(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R15:
registers.setR15(addressSpace.get64(savedRegisters));
break;
default:
(void)functionStart;
_LIBUNWIND_DEBUG_LOG("bad register for RBP frame, encoding=%08X for "
"function starting at 0x%llX\n",
compactEncoding, functionStart);
_LIBUNWIND_ABORT("invalid compact unwind encoding");
}
savedRegisters += 8;
savedRegistersLocations = (savedRegistersLocations >> 3);
}
frameUnwind(addressSpace, registers);
return UNW_STEP_SUCCESS;
}
template <typename A>
int CompactUnwinder_x86_64<A>::stepWithCompactEncodingFrameless(
compact_unwind_encoding_t encoding, uint64_t functionStart, A &addressSpace,
Registers_x86_64 &registers, bool indirectStackSize) {
uint32_t stackSizeEncoded =
EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_SIZE);
uint32_t stackAdjust =
EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_ADJUST);
uint32_t regCount =
EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT);
uint32_t permutation =
EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION);
uint32_t stackSize = stackSizeEncoded * 8;
if (indirectStackSize) {
// stack size is encoded in subl $xxx,%esp instruction
uint32_t subl = addressSpace.get32(functionStart + stackSizeEncoded);
stackSize = subl + 8 * stackAdjust;
}
// decompress permutation
uint32_t permunreg[6];
switch (regCount) {
case 6:
permunreg[0] = permutation / 120;
permutation -= (permunreg[0] * 120);
permunreg[1] = permutation / 24;
permutation -= (permunreg[1] * 24);
permunreg[2] = permutation / 6;
permutation -= (permunreg[2] * 6);
permunreg[3] = permutation / 2;
permutation -= (permunreg[3] * 2);
permunreg[4] = permutation;
permunreg[5] = 0;
break;
case 5:
permunreg[0] = permutation / 120;
permutation -= (permunreg[0] * 120);
permunreg[1] = permutation / 24;
permutation -= (permunreg[1] * 24);
permunreg[2] = permutation / 6;
permutation -= (permunreg[2] * 6);
permunreg[3] = permutation / 2;
permutation -= (permunreg[3] * 2);
permunreg[4] = permutation;
break;
case 4:
permunreg[0] = permutation / 60;
permutation -= (permunreg[0] * 60);
permunreg[1] = permutation / 12;
permutation -= (permunreg[1] * 12);
permunreg[2] = permutation / 3;
permutation -= (permunreg[2] * 3);
permunreg[3] = permutation;
break;
case 3:
permunreg[0] = permutation / 20;
permutation -= (permunreg[0] * 20);
permunreg[1] = permutation / 4;
permutation -= (permunreg[1] * 4);
permunreg[2] = permutation;
break;
case 2:
permunreg[0] = permutation / 5;
permutation -= (permunreg[0] * 5);
permunreg[1] = permutation;
break;
case 1:
permunreg[0] = permutation;
break;
}
// re-number registers back to standard numbers
int registersSaved[6];
bool used[7] = { false, false, false, false, false, false, false };
for (uint32_t i = 0; i < regCount; ++i) {
uint32_t renum = 0;
for (int u = 1; u < 7; ++u) {
if (!used[u]) {
if (renum == permunreg[i]) {
registersSaved[i] = u;
used[u] = true;
break;
}
++renum;
}
}
}
uint64_t savedRegisters = registers.getSP() + stackSize - 8 - 8 * regCount;
for (uint32_t i = 0; i < regCount; ++i) {
switch (registersSaved[i]) {
case UNWIND_X86_64_REG_RBX:
registers.setRBX(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R12:
registers.setR12(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R13:
registers.setR13(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R14:
registers.setR14(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_R15:
registers.setR15(addressSpace.get64(savedRegisters));
break;
case UNWIND_X86_64_REG_RBP:
registers.setRBP(addressSpace.get64(savedRegisters));
break;
default:
_LIBUNWIND_DEBUG_LOG("bad register for frameless, encoding=%08X for "
"function starting at 0x%llX\n",
encoding, functionStart);
_LIBUNWIND_ABORT("invalid compact unwind encoding");
}
savedRegisters += 8;
}
framelessUnwind(addressSpace, savedRegisters, registers);
return UNW_STEP_SUCCESS;
}
template <typename A>
void CompactUnwinder_x86_64<A>::frameUnwind(A &addressSpace,
Registers_x86_64 &registers) {
uint64_t rbp = registers.getRBP();
// ebp points to old ebp
registers.setRBP(addressSpace.get64(rbp));
// old esp is ebp less saved ebp and return address
registers.setSP(rbp + 16);
// pop return address into eip
registers.setIP(addressSpace.get64(rbp + 8));
}
template <typename A>
void CompactUnwinder_x86_64<A>::framelessUnwind(A &addressSpace,
uint64_t returnAddressLocation,
Registers_x86_64 &registers) {
// return address is on stack after last saved register
registers.setIP(addressSpace.get64(returnAddressLocation));
// old esp is before return address
registers.setSP(returnAddressLocation + 8);
}
/// CompactUnwinder_arm64 uses a compact unwind info to virtually "step" (aka
/// unwind) by modifying a Registers_arm64 register set
template <typename A>
class CompactUnwinder_arm64 {
public:
static int stepWithCompactEncoding(compact_unwind_encoding_t compactEncoding,
uint64_t functionStart, A &addressSpace,
Registers_arm64 &registers);
private:
typename A::pint_t pint_t;
static int
stepWithCompactEncodingFrame(compact_unwind_encoding_t compactEncoding,
uint64_t functionStart, A &addressSpace,
Registers_arm64 &registers);
static int stepWithCompactEncodingFrameless(
compact_unwind_encoding_t compactEncoding, uint64_t functionStart,
A &addressSpace, Registers_arm64 &registers);
};
template <typename A>
int CompactUnwinder_arm64<A>::stepWithCompactEncoding(
compact_unwind_encoding_t compactEncoding, uint64_t functionStart,
A &addressSpace, Registers_arm64 &registers) {
switch (compactEncoding & UNWIND_ARM64_MODE_MASK) {
case UNWIND_ARM64_MODE_FRAME:
return stepWithCompactEncodingFrame(compactEncoding, functionStart,
addressSpace, registers);
case UNWIND_ARM64_MODE_FRAMELESS:
return stepWithCompactEncodingFrameless(compactEncoding, functionStart,
addressSpace, registers);
}
_LIBUNWIND_ABORT("invalid compact unwind encoding");
}
template <typename A>
int CompactUnwinder_arm64<A>::stepWithCompactEncodingFrameless(
compact_unwind_encoding_t encoding, uint64_t, A &addressSpace,
Registers_arm64 &registers) {
uint32_t stackSize =
16 * EXTRACT_BITS(encoding, UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK);
uint64_t savedRegisterLoc = registers.getSP() + stackSize;
if (encoding & UNWIND_ARM64_FRAME_X19_X20_PAIR) {
registers.setRegister(UNW_ARM64_X19, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X20, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X21_X22_PAIR) {
registers.setRegister(UNW_ARM64_X21, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X22, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X23_X24_PAIR) {
registers.setRegister(UNW_ARM64_X23, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X24, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X25_X26_PAIR) {
registers.setRegister(UNW_ARM64_X25, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X26, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X27_X28_PAIR) {
registers.setRegister(UNW_ARM64_X27, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X28, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D8_D9_PAIR) {
registers.setFloatRegister(UNW_ARM64_D8,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D9,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D10_D11_PAIR) {
registers.setFloatRegister(UNW_ARM64_D10,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D11,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D12_D13_PAIR) {
registers.setFloatRegister(UNW_ARM64_D12,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D13,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D14_D15_PAIR) {
registers.setFloatRegister(UNW_ARM64_D14,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D15,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
// subtract stack size off of sp
registers.setSP(savedRegisterLoc);
// set pc to be value in lr
registers.setIP(registers.getRegister(UNW_ARM64_LR));
return UNW_STEP_SUCCESS;
}
template <typename A>
int CompactUnwinder_arm64<A>::stepWithCompactEncodingFrame(
compact_unwind_encoding_t encoding, uint64_t, A &addressSpace,
Registers_arm64 &registers) {
uint64_t savedRegisterLoc = registers.getFP() - 8;
if (encoding & UNWIND_ARM64_FRAME_X19_X20_PAIR) {
registers.setRegister(UNW_ARM64_X19, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X20, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X21_X22_PAIR) {
registers.setRegister(UNW_ARM64_X21, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X22, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X23_X24_PAIR) {
registers.setRegister(UNW_ARM64_X23, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X24, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X25_X26_PAIR) {
registers.setRegister(UNW_ARM64_X25, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X26, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_X27_X28_PAIR) {
registers.setRegister(UNW_ARM64_X27, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setRegister(UNW_ARM64_X28, addressSpace.get64(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D8_D9_PAIR) {
registers.setFloatRegister(UNW_ARM64_D8,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D9,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D10_D11_PAIR) {
registers.setFloatRegister(UNW_ARM64_D10,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D11,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D12_D13_PAIR) {
registers.setFloatRegister(UNW_ARM64_D12,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D13,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
if (encoding & UNWIND_ARM64_FRAME_D14_D15_PAIR) {
registers.setFloatRegister(UNW_ARM64_D14,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
registers.setFloatRegister(UNW_ARM64_D15,
addressSpace.getDouble(savedRegisterLoc));
savedRegisterLoc -= 8;
}
uint64_t fp = registers.getFP();
// fp points to old fp
registers.setFP(addressSpace.get64(fp));
// old sp is fp less saved fp and lr
registers.setSP(fp + 16);
// pop return address into pc
registers.setIP(addressSpace.get64(fp + 8));
return UNW_STEP_SUCCESS;
}
}; // namespace libunwind
#endif // __COMPACT_UNWINDER_HPP__

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//===-------------------------- DwarfInstructions.hpp ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Processor specific interpretation of dwarf unwind info.
//
//===----------------------------------------------------------------------===//
#ifndef __DWARF_INSTRUCTIONS_HPP__
#define __DWARF_INSTRUCTIONS_HPP__
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "dwarf2.h"
#include "AddressSpace.hpp"
#include "Registers.hpp"
#include "DwarfParser.hpp"
#include "config.h"
namespace libunwind {
/// DwarfInstructions maps abtract dwarf unwind instructions to a particular
/// architecture
template <typename A, typename R>
class DwarfInstructions {
public:
typedef typename A::pint_t pint_t;
typedef typename A::sint_t sint_t;
static int stepWithDwarf(A &addressSpace, pint_t pc, pint_t fdeStart,
R &registers);
private:
enum {
DW_X86_64_RET_ADDR = 16
};
enum {
DW_X86_RET_ADDR = 8
};
typedef typename CFI_Parser<A>::RegisterLocation RegisterLocation;
typedef typename CFI_Parser<A>::PrologInfo PrologInfo;
typedef typename CFI_Parser<A>::FDE_Info FDE_Info;
typedef typename CFI_Parser<A>::CIE_Info CIE_Info;
static pint_t evaluateExpression(pint_t expression, A &addressSpace,
const R &registers,
pint_t initialStackValue);
static pint_t getSavedRegister(A &addressSpace, const R &registers,
pint_t cfa, const RegisterLocation &savedReg);
static double getSavedFloatRegister(A &addressSpace, const R &registers,
pint_t cfa, const RegisterLocation &savedReg);
static v128 getSavedVectorRegister(A &addressSpace, const R &registers,
pint_t cfa, const RegisterLocation &savedReg);
// x86 specific variants
static int lastRestoreReg(const Registers_x86 &);
static bool isReturnAddressRegister(int regNum, const Registers_x86 &);
static pint_t getCFA(A &addressSpace, const PrologInfo &prolog,
const Registers_x86 &);
// x86_64 specific variants
static int lastRestoreReg(const Registers_x86_64 &);
static bool isReturnAddressRegister(int regNum, const Registers_x86_64 &);
static pint_t getCFA(A &addressSpace,
const PrologInfo &prolog,
const Registers_x86_64 &);
// ppc specific variants
static int lastRestoreReg(const Registers_ppc &);
static bool isReturnAddressRegister(int regNum, const Registers_ppc &);
static pint_t getCFA(A &addressSpace,
const PrologInfo &prolog,
const Registers_ppc &);
// arm64 specific variants
static bool isReturnAddressRegister(int regNum, const Registers_arm64 &);
static int lastRestoreReg(const Registers_arm64 &);
static pint_t getCFA(A &addressSpace,
const PrologInfo &prolog,
const Registers_arm64 &);
};
template <typename A, typename R>
typename A::pint_t DwarfInstructions<A, R>::getSavedRegister(
A &addressSpace, const R &registers, pint_t cfa,
const RegisterLocation &savedReg) {
switch (savedReg.location) {
case CFI_Parser<A>::kRegisterInCFA:
return addressSpace.getP(cfa + (pint_t)savedReg.value);
case CFI_Parser<A>::kRegisterAtExpression:
return addressSpace.getP(
evaluateExpression((pint_t)savedReg.value, addressSpace,
registers, cfa));
case CFI_Parser<A>::kRegisterIsExpression:
return evaluateExpression((pint_t)savedReg.value, addressSpace,
registers, cfa);
case CFI_Parser<A>::kRegisterInRegister:
return registers.getRegister((int)savedReg.value);
case CFI_Parser<A>::kRegisterUnused:
case CFI_Parser<A>::kRegisterOffsetFromCFA:
// FIX ME
break;
}
_LIBUNWIND_ABORT("unsupported restore location for register");
}
template <typename A, typename R>
double DwarfInstructions<A, R>::getSavedFloatRegister(
A &addressSpace, const R &registers, pint_t cfa,
const RegisterLocation &savedReg) {
switch (savedReg.location) {
case CFI_Parser<A>::kRegisterInCFA:
return addressSpace.getDouble(cfa + (pint_t)savedReg.value);
case CFI_Parser<A>::kRegisterAtExpression:
return addressSpace.getDouble(
evaluateExpression((pint_t)savedReg.value, addressSpace,
registers, cfa));
case CFI_Parser<A>::kRegisterIsExpression:
case CFI_Parser<A>::kRegisterUnused:
case CFI_Parser<A>::kRegisterOffsetFromCFA:
case CFI_Parser<A>::kRegisterInRegister:
// FIX ME
break;
}
_LIBUNWIND_ABORT("unsupported restore location for float register");
}
template <typename A, typename R>
v128 DwarfInstructions<A, R>::getSavedVectorRegister(
A &addressSpace, const R &registers, pint_t cfa,
const RegisterLocation &savedReg) {
switch (savedReg.location) {
case CFI_Parser<A>::kRegisterInCFA:
return addressSpace.getVector(cfa + (pint_t)savedReg.value);
case CFI_Parser<A>::kRegisterAtExpression:
return addressSpace.getVector(
evaluateExpression((pint_t)savedReg.value, addressSpace,
registers, cfa));
case CFI_Parser<A>::kRegisterIsExpression:
case CFI_Parser<A>::kRegisterUnused:
case CFI_Parser<A>::kRegisterOffsetFromCFA:
case CFI_Parser<A>::kRegisterInRegister:
// FIX ME
break;
}
_LIBUNWIND_ABORT("unsupported restore location for vector register");
}
template <typename A, typename R>
int DwarfInstructions<A, R>::stepWithDwarf(A &addressSpace, pint_t pc,
pint_t fdeStart, R &registers) {
FDE_Info fdeInfo;
CIE_Info cieInfo;
if (CFI_Parser<A>::decodeFDE(addressSpace, fdeStart,
&fdeInfo, &cieInfo) == NULL) {
PrologInfo prolog;
if (CFI_Parser<A>::parseFDEInstructions(addressSpace, fdeInfo, cieInfo, pc,
&prolog)) {
R newRegisters = registers;
// get pointer to cfa (architecture specific)
pint_t cfa = getCFA(addressSpace, prolog, registers);
// restore registers that dwarf says were saved
pint_t returnAddress = 0;
for (int i = 0; i <= lastRestoreReg(newRegisters); ++i) {
if (prolog.savedRegisters[i].location !=
CFI_Parser<A>::kRegisterUnused) {
if (registers.validFloatRegister(i))
newRegisters.setFloatRegister(
i, getSavedFloatRegister(addressSpace, registers, cfa,
prolog.savedRegisters[i]));
else if (registers.validVectorRegister(i))
newRegisters.setVectorRegister(
i, getSavedVectorRegister(addressSpace, registers, cfa,
prolog.savedRegisters[i]));
else if (isReturnAddressRegister(i, registers))
returnAddress = getSavedRegister(addressSpace, registers, cfa,
prolog.savedRegisters[i]);
else if (registers.validRegister(i))
newRegisters.setRegister(
i, getSavedRegister(addressSpace, registers, cfa,
prolog.savedRegisters[i]));
else
return UNW_EBADREG;
}
}
// By definition, the CFA is the stack pointer at the call site, so
// restoring SP means setting it to CFA.
newRegisters.setSP(cfa);
// Return address is address after call site instruction, so setting IP to
// that does simualates a return.
newRegisters.setIP(returnAddress);
// Simulate the step by replacing the register set with the new ones.
registers = newRegisters;
return UNW_STEP_SUCCESS;
}
}
return UNW_EBADFRAME;
}
template <typename A, typename R>
typename A::pint_t
DwarfInstructions<A, R>::evaluateExpression(pint_t expression, A &addressSpace,
const R &registers,
pint_t initialStackValue) {
const bool log = false;
pint_t p = expression;
pint_t expressionEnd = expression + 20; // temp, until len read
pint_t length = (pint_t)addressSpace.getULEB128(p, expressionEnd);
expressionEnd = p + length;
if (log)
fprintf(stderr, "evaluateExpression(): length=%llu\n", (uint64_t)length);
pint_t stack[100];
pint_t *sp = stack;
*(++sp) = initialStackValue;
while (p < expressionEnd) {
if (log) {
for (pint_t *t = sp; t > stack; --t) {
fprintf(stderr, "sp[] = 0x%llX\n", (uint64_t)(*t));
}
}
uint8_t opcode = addressSpace.get8(p++);
sint_t svalue, svalue2;
pint_t value;
uint32_t reg;
switch (opcode) {
case DW_OP_addr:
// push immediate address sized value
value = addressSpace.getP(p);
p += sizeof(pint_t);
*(++sp) = value;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) value);
break;
case DW_OP_deref:
// pop stack, dereference, push result
value = *sp--;
*(++sp) = addressSpace.getP(value);
if (log)
fprintf(stderr, "dereference 0x%llX\n", (uint64_t) value);
break;
case DW_OP_const1u:
// push immediate 1 byte value
value = addressSpace.get8(p);
p += 1;
*(++sp) = value;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) value);
break;
case DW_OP_const1s:
// push immediate 1 byte signed value
svalue = (int8_t) addressSpace.get8(p);
p += 1;
*(++sp) = (pint_t)svalue;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) svalue);
break;
case DW_OP_const2u:
// push immediate 2 byte value
value = addressSpace.get16(p);
p += 2;
*(++sp) = value;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) value);
break;
case DW_OP_const2s:
// push immediate 2 byte signed value
svalue = (int16_t) addressSpace.get16(p);
p += 2;
*(++sp) = (pint_t)svalue;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) svalue);
break;
case DW_OP_const4u:
// push immediate 4 byte value
value = addressSpace.get32(p);
p += 4;
*(++sp) = value;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) value);
break;
case DW_OP_const4s:
// push immediate 4 byte signed value
svalue = (int32_t)addressSpace.get32(p);
p += 4;
*(++sp) = (pint_t)svalue;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) svalue);
break;
case DW_OP_const8u:
// push immediate 8 byte value
value = (pint_t)addressSpace.get64(p);
p += 8;
*(++sp) = value;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) value);
break;
case DW_OP_const8s:
// push immediate 8 byte signed value
value = (pint_t)addressSpace.get64(p);
p += 8;
*(++sp) = value;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) value);
break;
case DW_OP_constu:
// push immediate ULEB128 value
value = (pint_t)addressSpace.getULEB128(p, expressionEnd);
*(++sp) = value;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) value);
break;
case DW_OP_consts:
// push immediate SLEB128 value
svalue = (sint_t)addressSpace.getSLEB128(p, expressionEnd);
*(++sp) = (pint_t)svalue;
if (log)
fprintf(stderr, "push 0x%llX\n", (uint64_t) svalue);
break;
case DW_OP_dup:
// push top of stack
value = *sp;
*(++sp) = value;
if (log)
fprintf(stderr, "duplicate top of stack\n");
break;
case DW_OP_drop:
// pop
--sp;
if (log)
fprintf(stderr, "pop top of stack\n");
break;
case DW_OP_over:
// dup second
value = sp[-1];
*(++sp) = value;
if (log)
fprintf(stderr, "duplicate second in stack\n");
break;
case DW_OP_pick:
// pick from
reg = addressSpace.get8(p);
p += 1;
value = sp[-reg];
*(++sp) = value;
if (log)
fprintf(stderr, "duplicate %d in stack\n", reg);
break;
case DW_OP_swap:
// swap top two
value = sp[0];
sp[0] = sp[-1];
sp[-1] = value;
if (log)
fprintf(stderr, "swap top of stack\n");
break;
case DW_OP_rot:
// rotate top three
value = sp[0];
sp[0] = sp[-1];
sp[-1] = sp[-2];
sp[-2] = value;
if (log)
fprintf(stderr, "rotate top three of stack\n");
break;
case DW_OP_xderef:
// pop stack, dereference, push result
value = *sp--;
*sp = *((pint_t*)value);
if (log)
fprintf(stderr, "x-dereference 0x%llX\n", (uint64_t) value);
break;
case DW_OP_abs:
svalue = (sint_t)*sp;
if (svalue < 0)
*sp = (pint_t)(-svalue);
if (log)
fprintf(stderr, "abs\n");
break;
case DW_OP_and:
value = *sp--;
*sp &= value;
if (log)
fprintf(stderr, "and\n");
break;
case DW_OP_div:
svalue = (sint_t)(*sp--);
svalue2 = (sint_t)*sp;
*sp = (pint_t)(svalue2 / svalue);
if (log)
fprintf(stderr, "div\n");
break;
case DW_OP_minus:
value = *sp--;
*sp = *sp - value;
if (log)
fprintf(stderr, "minus\n");
break;
case DW_OP_mod:
svalue = (sint_t)(*sp--);
svalue2 = (sint_t)*sp;
*sp = (pint_t)(svalue2 % svalue);
if (log)
fprintf(stderr, "module\n");
break;
case DW_OP_mul:
svalue = (sint_t)(*sp--);
svalue2 = (sint_t)*sp;
*sp = (pint_t)(svalue2 * svalue);
if (log)
fprintf(stderr, "mul\n");
break;
case DW_OP_neg:
*sp = 0 - *sp;
if (log)
fprintf(stderr, "neg\n");
break;
case DW_OP_not:
svalue = (sint_t)(*sp);
*sp = (pint_t)(~svalue);
if (log)
fprintf(stderr, "not\n");
break;
case DW_OP_or:
value = *sp--;
*sp |= value;
if (log)
fprintf(stderr, "or\n");
break;
case DW_OP_plus:
value = *sp--;
*sp += value;
if (log)
fprintf(stderr, "plus\n");
break;
case DW_OP_plus_uconst:
// pop stack, add uelb128 constant, push result
*sp += addressSpace.getULEB128(p, expressionEnd);
if (log)
fprintf(stderr, "add constant\n");
break;
case DW_OP_shl:
value = *sp--;
*sp = *sp << value;
if (log)
fprintf(stderr, "shift left\n");
break;
case DW_OP_shr:
value = *sp--;
*sp = *sp >> value;
if (log)
fprintf(stderr, "shift left\n");
break;
case DW_OP_shra:
value = *sp--;
svalue = (sint_t)*sp;
*sp = (pint_t)(svalue >> value);
if (log)
fprintf(stderr, "shift left arithmetric\n");
break;
case DW_OP_xor:
value = *sp--;
*sp ^= value;
if (log)
fprintf(stderr, "xor\n");
break;
case DW_OP_skip:
svalue = (int16_t) addressSpace.get16(p);
p += 2;
p = (pint_t)((sint_t)p + svalue);
if (log)
fprintf(stderr, "skip %lld\n", (uint64_t) svalue);
break;
case DW_OP_bra:
svalue = (int16_t) addressSpace.get16(p);
p += 2;
if (*sp--)
p = (pint_t)((sint_t)p + svalue);
if (log)
fprintf(stderr, "bra %lld\n", (uint64_t) svalue);
break;
case DW_OP_eq:
value = *sp--;
*sp = (*sp == value);
if (log)
fprintf(stderr, "eq\n");
break;
case DW_OP_ge:
value = *sp--;
*sp = (*sp >= value);
if (log)
fprintf(stderr, "ge\n");
break;
case DW_OP_gt:
value = *sp--;
*sp = (*sp > value);
if (log)
fprintf(stderr, "gt\n");
break;
case DW_OP_le:
value = *sp--;
*sp = (*sp <= value);
if (log)
fprintf(stderr, "le\n");
break;
case DW_OP_lt:
value = *sp--;
*sp = (*sp < value);
if (log)
fprintf(stderr, "lt\n");
break;
case DW_OP_ne:
value = *sp--;
*sp = (*sp != value);
if (log)
fprintf(stderr, "ne\n");
break;
case DW_OP_lit0:
case DW_OP_lit1:
case DW_OP_lit2:
case DW_OP_lit3:
case DW_OP_lit4:
case DW_OP_lit5:
case DW_OP_lit6:
case DW_OP_lit7:
case DW_OP_lit8:
case DW_OP_lit9:
case DW_OP_lit10:
case DW_OP_lit11:
case DW_OP_lit12:
case DW_OP_lit13:
case DW_OP_lit14:
case DW_OP_lit15:
case DW_OP_lit16:
case DW_OP_lit17:
case DW_OP_lit18:
case DW_OP_lit19:
case DW_OP_lit20:
case DW_OP_lit21:
case DW_OP_lit22:
case DW_OP_lit23:
case DW_OP_lit24:
case DW_OP_lit25:
case DW_OP_lit26:
case DW_OP_lit27:
case DW_OP_lit28:
case DW_OP_lit29:
case DW_OP_lit30:
case DW_OP_lit31:
value = opcode - DW_OP_lit0;
*(++sp) = value;
if (log)
fprintf(stderr, "push literal 0x%llX\n", (uint64_t) value);
break;
case DW_OP_reg0:
case DW_OP_reg1:
case DW_OP_reg2:
case DW_OP_reg3:
case DW_OP_reg4:
case DW_OP_reg5:
case DW_OP_reg6:
case DW_OP_reg7:
case DW_OP_reg8:
case DW_OP_reg9:
case DW_OP_reg10:
case DW_OP_reg11:
case DW_OP_reg12:
case DW_OP_reg13:
case DW_OP_reg14:
case DW_OP_reg15:
case DW_OP_reg16:
case DW_OP_reg17:
case DW_OP_reg18:
case DW_OP_reg19:
case DW_OP_reg20:
case DW_OP_reg21:
case DW_OP_reg22:
case DW_OP_reg23:
case DW_OP_reg24:
case DW_OP_reg25:
case DW_OP_reg26:
case DW_OP_reg27:
case DW_OP_reg28:
case DW_OP_reg29:
case DW_OP_reg30:
case DW_OP_reg31:
reg = opcode - DW_OP_reg0;
*(++sp) = registers.getRegister((int)reg);
if (log)
fprintf(stderr, "push reg %d\n", reg);
break;
case DW_OP_regx:
reg = (uint32_t)addressSpace.getULEB128(p, expressionEnd);
*(++sp) = registers.getRegister((int)reg);
if (log)
fprintf(stderr, "push reg %d + 0x%llX\n", reg, (uint64_t) svalue);
break;
case DW_OP_breg0:
case DW_OP_breg1:
case DW_OP_breg2:
case DW_OP_breg3:
case DW_OP_breg4:
case DW_OP_breg5:
case DW_OP_breg6:
case DW_OP_breg7:
case DW_OP_breg8:
case DW_OP_breg9:
case DW_OP_breg10:
case DW_OP_breg11:
case DW_OP_breg12:
case DW_OP_breg13:
case DW_OP_breg14:
case DW_OP_breg15:
case DW_OP_breg16:
case DW_OP_breg17:
case DW_OP_breg18:
case DW_OP_breg19:
case DW_OP_breg20:
case DW_OP_breg21:
case DW_OP_breg22:
case DW_OP_breg23:
case DW_OP_breg24:
case DW_OP_breg25:
case DW_OP_breg26:
case DW_OP_breg27:
case DW_OP_breg28:
case DW_OP_breg29:
case DW_OP_breg30:
case DW_OP_breg31:
reg = opcode - DW_OP_breg0;
svalue = (sint_t)addressSpace.getSLEB128(p, expressionEnd);
svalue += registers.getRegister((int)reg);
*(++sp) = (pint_t)(svalue);
if (log)
fprintf(stderr, "push reg %d + 0x%llX\n", reg, (uint64_t) svalue);
break;
case DW_OP_bregx:
reg = (uint32_t)addressSpace.getULEB128(p, expressionEnd);
svalue = (sint_t)addressSpace.getSLEB128(p, expressionEnd);
svalue += registers.getRegister((int)reg);
*(++sp) = (pint_t)(svalue);
if (log)
fprintf(stderr, "push reg %d + 0x%llX\n", reg, (uint64_t) svalue);
break;
case DW_OP_fbreg:
_LIBUNWIND_ABORT("DW_OP_fbreg not implemented");
break;
case DW_OP_piece:
_LIBUNWIND_ABORT("DW_OP_piece not implemented");
break;
case DW_OP_deref_size:
// pop stack, dereference, push result
value = *sp--;
switch (addressSpace.get8(p++)) {
case 1:
value = addressSpace.get8(value);
break;
case 2:
value = addressSpace.get16(value);
break;
case 4:
value = addressSpace.get32(value);
break;
case 8:
value = (pint_t)addressSpace.get64(value);
break;
default:
_LIBUNWIND_ABORT("DW_OP_deref_size with bad size");
}
*(++sp) = value;
if (log)
fprintf(stderr, "sized dereference 0x%llX\n", (uint64_t) value);
break;
case DW_OP_xderef_size:
case DW_OP_nop:
case DW_OP_push_object_addres:
case DW_OP_call2:
case DW_OP_call4:
case DW_OP_call_ref:
default:
_LIBUNWIND_ABORT("dwarf opcode not implemented");
}
}
if (log)
fprintf(stderr, "expression evaluates to 0x%llX\n", (uint64_t) * sp);
return *sp;
}
//
// x86_64 specific functions
//
template <typename A, typename R>
int DwarfInstructions<A, R>::lastRestoreReg(const Registers_x86_64 &) {
static_assert((int)CFI_Parser<A>::kMaxRegisterNumber
> (int)DW_X86_64_RET_ADDR, "register number out of range");
return DW_X86_64_RET_ADDR;
}
template <typename A, typename R>
bool
DwarfInstructions<A, R>::isReturnAddressRegister(int regNum,
const Registers_x86_64 &) {
return (regNum == DW_X86_64_RET_ADDR);
}
template <typename A, typename R>
typename A::pint_t DwarfInstructions<A, R>::getCFA(
A &addressSpace, const PrologInfo &prolog,
const Registers_x86_64 &registers) {
if (prolog.cfaRegister != 0)
return (pint_t)((sint_t)registers.getRegister((int)prolog.cfaRegister)
+ prolog.cfaRegisterOffset);
else if (prolog.cfaExpression != 0)
return evaluateExpression((pint_t)prolog.cfaExpression, addressSpace, registers, 0);
else
_LIBUNWIND_ABORT("getCFA(): unknown location for x86_64 cfa");
}
//
// x86 specific functions
//
template <typename A, typename R>
int DwarfInstructions<A, R>::lastRestoreReg(const Registers_x86 &) {
static_assert((int)CFI_Parser<A>::kMaxRegisterNumber
> (int)DW_X86_RET_ADDR, "register number out of range");
return DW_X86_RET_ADDR;
}
template <typename A, typename R>
bool DwarfInstructions<A, R>::isReturnAddressRegister(int regNum,
const Registers_x86 &) {
return (regNum == DW_X86_RET_ADDR);
}
template <typename A, typename R>
typename A::pint_t DwarfInstructions<A, R>::getCFA(
A &addressSpace, const PrologInfo &prolog,
const Registers_x86 &registers) {
if (prolog.cfaRegister != 0)
return (pint_t)((sint_t)registers.getRegister((int)prolog.cfaRegister)
+ prolog.cfaRegisterOffset);
else if (prolog.cfaExpression != 0)
return evaluateExpression((pint_t)prolog.cfaExpression, addressSpace,
registers, 0);
else
_LIBUNWIND_ABORT("getCFA(): unknown location for x86 cfa");
}
//
// ppc specific functions
//
template <typename A, typename R>
int DwarfInstructions<A, R>::lastRestoreReg(const Registers_ppc &) {
static_assert((int)CFI_Parser<A>::kMaxRegisterNumber
> (int)UNW_PPC_SPEFSCR, "register number out of range");
return UNW_PPC_SPEFSCR;
}
template <typename A, typename R>
bool DwarfInstructions<A, R>::isReturnAddressRegister(int regNum,
const Registers_ppc &) {
return (regNum == UNW_PPC_LR);
}
template <typename A, typename R>
typename A::pint_t DwarfInstructions<A, R>::getCFA(
A &addressSpace, const PrologInfo &prolog,
const Registers_ppc &registers) {
if (prolog.cfaRegister != 0)
return registers.getRegister(prolog.cfaRegister) + prolog.cfaRegisterOffset;
else if (prolog.cfaExpression != 0)
return evaluateExpression((pint_t)prolog.cfaExpression, addressSpace,
registers, 0);
else
_LIBUNWIND_ABORT("getCFA(): unknown location for ppc cfa");
}
//
// arm64 specific functions
//
template <typename A, typename R>
bool DwarfInstructions<A, R>::isReturnAddressRegister(int regNum,
const Registers_arm64 &) {
return (regNum == UNW_ARM64_LR);
}
template <typename A, typename R>
int DwarfInstructions<A, R>::lastRestoreReg(const Registers_arm64 &) {
static_assert((int)CFI_Parser<A>::kMaxRegisterNumber
> (int)UNW_ARM64_D31, "register number out of range");
return UNW_ARM64_D31;
}
template <typename A, typename R>
typename A::pint_t DwarfInstructions<A, R>::getCFA(A&, const PrologInfo &prolog,
const Registers_arm64 &registers) {
if (prolog.cfaRegister != 0)
return registers.getRegister(prolog.cfaRegister) + prolog.cfaRegisterOffset;
else
_LIBUNWIND_ABORT("getCFA(): unsupported location for arm64 cfa");
}
} // namespace libunwind
#endif // __DWARF_INSTRUCTIONS_HPP__

713
libcxxabi/src/Unwind/DwarfParser.hpp Normal file
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@ -0,0 +1,713 @@
//===--------------------------- DwarfParser.hpp --------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Parses DWARF CFIs (FDEs and CIEs).
//
//===----------------------------------------------------------------------===//
#ifndef __DWARF_PARSER_HPP__
#define __DWARF_PARSER_HPP__
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include "libunwind.h"
#include "dwarf2.h"
#include "AddressSpace.hpp"
namespace libunwind {
/// CFI_Parser does basic parsing of a CFI (Call Frame Information) records.
/// See Dwarf Spec for details:
/// http://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html
///
template <typename A>
class CFI_Parser {
public:
typedef typename A::pint_t pint_t;
/// Information encoded in a CIE (Common Information Entry)
struct CIE_Info {
pint_t cieStart;
pint_t cieLength;
pint_t cieInstructions;
uint8_t pointerEncoding;
uint8_t lsdaEncoding;
uint8_t personalityEncoding;
uint8_t personalityOffsetInCIE;
pint_t personality;
uint32_t codeAlignFactor;
int dataAlignFactor;
bool isSignalFrame;
bool fdesHaveAugmentationData;
};
/// Information about an FDE (Frame Description Entry)
struct FDE_Info {
pint_t fdeStart;
pint_t fdeLength;
pint_t fdeInstructions;
pint_t pcStart;
pint_t pcEnd;
pint_t lsda;
};
enum {
kMaxRegisterNumber = 120
};
enum RegisterSavedWhere {
kRegisterUnused,
kRegisterInCFA,
kRegisterOffsetFromCFA,
kRegisterInRegister,
kRegisterAtExpression,
kRegisterIsExpression
};
struct RegisterLocation {
RegisterSavedWhere location;
int64_t value;
};
/// Information about a frame layout and registers saved determined
/// by "running" the dwarf FDE "instructions"
struct PrologInfo {
uint32_t cfaRegister;
int32_t cfaRegisterOffset; // CFA = (cfaRegister)+cfaRegisterOffset
int64_t cfaExpression; // CFA = expression
uint32_t spExtraArgSize;
uint32_t codeOffsetAtStackDecrement;
bool registersInOtherRegisters;
bool sameValueUsed;
RegisterLocation savedRegisters[kMaxRegisterNumber];
};
struct PrologInfoStackEntry {
PrologInfoStackEntry(PrologInfoStackEntry *n, const PrologInfo &i)
: next(n), info(i) {}
PrologInfoStackEntry *next;
PrologInfo info;
};
static bool findFDE(A &addressSpace, pint_t pc, pint_t ehSectionStart,
uint32_t sectionLength, pint_t fdeHint, FDE_Info *fdeInfo,
CIE_Info *cieInfo);
static const char *decodeFDE(A &addressSpace, pint_t fdeStart,
FDE_Info *fdeInfo, CIE_Info *cieInfo);
static bool parseFDEInstructions(A &addressSpace, const FDE_Info &fdeInfo,
const CIE_Info &cieInfo, pint_t upToPC,
PrologInfo *results);
static const char *parseCIE(A &addressSpace, pint_t cie, CIE_Info *cieInfo);
private:
static bool parseInstructions(A &addressSpace, pint_t instructions,
pint_t instructionsEnd, const CIE_Info &cieInfo,
pint_t pcoffset,
PrologInfoStackEntry *&rememberStack,
PrologInfo *results);
};
/// Parse a FDE into a CIE_Info and an FDE_Info
template <typename A>
const char *CFI_Parser<A>::decodeFDE(A &addressSpace, pint_t fdeStart,
FDE_Info *fdeInfo, CIE_Info *cieInfo) {
pint_t p = fdeStart;
pint_t cfiLength = (pint_t)addressSpace.get32(p);
p += 4;
if (cfiLength == 0xffffffff) {
// 0xffffffff means length is really next 8 bytes
cfiLength = (pint_t)addressSpace.get64(p);
p += 8;
}
if (cfiLength == 0)
return "FDE has zero length"; // end marker
uint32_t ciePointer = addressSpace.get32(p);
if (ciePointer == 0)
return "FDE is really a CIE"; // this is a CIE not an FDE
pint_t nextCFI = p + cfiLength;
pint_t cieStart = p - ciePointer;
const char *err = parseCIE(addressSpace, cieStart, cieInfo);
if (err != NULL)
return err;
p += 4;
// parse pc begin and range
pint_t pcStart =
addressSpace.getEncodedP(p, nextCFI, cieInfo->pointerEncoding);
pint_t pcRange =
addressSpace.getEncodedP(p, nextCFI, cieInfo->pointerEncoding & 0x0F);
// parse rest of info
fdeInfo->lsda = 0;
// check for augmentation length
if (cieInfo->fdesHaveAugmentationData) {
pint_t augLen = (pint_t)addressSpace.getULEB128(p, nextCFI);
pint_t endOfAug = p + augLen;
if (cieInfo->lsdaEncoding != 0) {
// peek at value (without indirection). Zero means no lsda
pint_t lsdaStart = p;
if (addressSpace.getEncodedP(p, nextCFI, cieInfo->lsdaEncoding & 0x0F) !=
0) {
// reset pointer and re-parse lsda address
p = lsdaStart;
fdeInfo->lsda =
addressSpace.getEncodedP(p, nextCFI, cieInfo->lsdaEncoding);
}
}
p = endOfAug;
}
fdeInfo->fdeStart = fdeStart;
fdeInfo->fdeLength = nextCFI - fdeStart;
fdeInfo->fdeInstructions = p;
fdeInfo->pcStart = pcStart;
fdeInfo->pcEnd = pcStart + pcRange;
return NULL; // success
}
/// Scan an eh_frame section to find an FDE for a pc
template <typename A>
bool CFI_Parser<A>::findFDE(A &addressSpace, pint_t pc, pint_t ehSectionStart,
uint32_t sectionLength, pint_t fdeHint,
FDE_Info *fdeInfo, CIE_Info *cieInfo) {
//fprintf(stderr, "findFDE(0x%llX)\n", (long long)pc);
pint_t p = (fdeHint != 0) ? fdeHint : ehSectionStart;
const pint_t ehSectionEnd = p + sectionLength;
while (p < ehSectionEnd) {
pint_t currentCFI = p;
//fprintf(stderr, "findFDE() CFI at 0x%llX\n", (long long)p);
pint_t cfiLength = addressSpace.get32(p);
p += 4;
if (cfiLength == 0xffffffff) {
// 0xffffffff means length is really next 8 bytes
cfiLength = (pint_t)addressSpace.get64(p);
p += 8;
}
if (cfiLength == 0)
return false; // end marker
uint32_t id = addressSpace.get32(p);
if (id == 0) {
// skip over CIEs
p += cfiLength;
} else {
// process FDE to see if it covers pc
pint_t nextCFI = p + cfiLength;
uint32_t ciePointer = addressSpace.get32(p);
pint_t cieStart = p - ciePointer;
// validate pointer to CIE is within section
if ((ehSectionStart <= cieStart) && (cieStart < ehSectionEnd)) {
if (parseCIE(addressSpace, cieStart, cieInfo) == NULL) {
p += 4;
// parse pc begin and range
pint_t pcStart =
addressSpace.getEncodedP(p, nextCFI, cieInfo->pointerEncoding);
pint_t pcRange = addressSpace.getEncodedP(
p, nextCFI, cieInfo->pointerEncoding & 0x0F);
// test if pc is within the function this FDE covers
if ((pcStart < pc) && (pc <= pcStart + pcRange)) {
// parse rest of info
fdeInfo->lsda = 0;
// check for augmentation length
if (cieInfo->fdesHaveAugmentationData) {
pint_t augLen = (pint_t)addressSpace.getULEB128(p, nextCFI);
pint_t endOfAug = p + augLen;
if (cieInfo->lsdaEncoding != 0) {
// peek at value (without indirection). Zero means no lsda
pint_t lsdaStart = p;
if (addressSpace.getEncodedP(
p, nextCFI, cieInfo->lsdaEncoding & 0x0F) != 0) {
// reset pointer and re-parse lsda address
p = lsdaStart;
fdeInfo->lsda = addressSpace
.getEncodedP(p, nextCFI, cieInfo->lsdaEncoding);
}
}
p = endOfAug;
}
fdeInfo->fdeStart = currentCFI;
fdeInfo->fdeLength = nextCFI - currentCFI;
fdeInfo->fdeInstructions = p;
fdeInfo->pcStart = pcStart;
fdeInfo->pcEnd = pcStart + pcRange;
return true;
} else {
// pc is not in begin/range, skip this FDE
}
} else {
// malformed CIE, now augmentation describing pc range encoding
}
} else {
// malformed FDE. CIE is bad
}
p = nextCFI;
}
}
return false;
}
/// Extract info from a CIE
template <typename A>
const char *CFI_Parser<A>::parseCIE(A &addressSpace, pint_t cie,
CIE_Info *cieInfo) {
cieInfo->pointerEncoding = 0;
cieInfo->lsdaEncoding = 0;
cieInfo->personalityEncoding = 0;
cieInfo->personalityOffsetInCIE = 0;
cieInfo->personality = 0;
cieInfo->codeAlignFactor = 0;
cieInfo->dataAlignFactor = 0;
cieInfo->isSignalFrame = false;
cieInfo->fdesHaveAugmentationData = false;
cieInfo->cieStart = cie;
pint_t p = cie;
pint_t cieLength = (pint_t)addressSpace.get32(p);
p += 4;
pint_t cieContentEnd = p + cieLength;
if (cieLength == 0xffffffff) {
// 0xffffffff means length is really next 8 bytes
cieLength = (pint_t)addressSpace.get64(p);
p += 8;
cieContentEnd = p + cieLength;
}
if (cieLength == 0)
return NULL;
// CIE ID is always 0
if (addressSpace.get32(p) != 0)
return "CIE ID is not zero";
p += 4;
// Version is always 1 or 3
uint8_t version = addressSpace.get8(p);
if ((version != 1) && (version != 3))
return "CIE version is not 1 or 3";
++p;
// save start of augmentation string and find end
pint_t strStart = p;
while (addressSpace.get8(p) != 0)
++p;
++p;
// parse code aligment factor
cieInfo->codeAlignFactor = (uint32_t)addressSpace.getULEB128(p, cieContentEnd);
// parse data alignment factor
cieInfo->dataAlignFactor = (int)addressSpace.getSLEB128(p, cieContentEnd);
// parse return address register
addressSpace.getULEB128(p, cieContentEnd);
// parse augmentation data based on augmentation string
const char *result = NULL;
if (addressSpace.get8(strStart) == 'z') {
// parse augmentation data length
addressSpace.getULEB128(p, cieContentEnd);
for (pint_t s = strStart; addressSpace.get8(s) != '\0'; ++s) {
switch (addressSpace.get8(s)) {
case 'z':
cieInfo->fdesHaveAugmentationData = true;
break;
case 'P':
cieInfo->personalityEncoding = addressSpace.get8(p);
++p;
cieInfo->personalityOffsetInCIE = (uint8_t)(p - cie);
cieInfo->personality = addressSpace
.getEncodedP(p, cieContentEnd, cieInfo->personalityEncoding);
break;
case 'L':
cieInfo->lsdaEncoding = addressSpace.get8(p);
++p;
break;
case 'R':
cieInfo->pointerEncoding = addressSpace.get8(p);
++p;
break;
case 'S':
cieInfo->isSignalFrame = true;
break;
default:
// ignore unknown letters
break;
}
}
}
cieInfo->cieLength = cieContentEnd - cieInfo->cieStart;
cieInfo->cieInstructions = p;
return result;
}
/// "run" the dwarf instructions and create the abstact PrologInfo for an FDE
template <typename A>
bool CFI_Parser<A>::parseFDEInstructions(A &addressSpace,
const FDE_Info &fdeInfo,
const CIE_Info &cieInfo, pint_t upToPC,
PrologInfo *results) {
// clear results
bzero(results, sizeof(PrologInfo));
PrologInfoStackEntry *rememberStack = NULL;
// parse CIE then FDE instructions
return parseInstructions(addressSpace, cieInfo.cieInstructions,
cieInfo.cieStart + cieInfo.cieLength, cieInfo,
(pint_t)(-1), rememberStack, results) &&
parseInstructions(addressSpace, fdeInfo.fdeInstructions,
fdeInfo.fdeStart + fdeInfo.fdeLength, cieInfo,
upToPC - fdeInfo.pcStart, rememberStack, results);
}
/// "run" the dwarf instructions
template <typename A>
bool CFI_Parser<A>::parseInstructions(A &addressSpace, pint_t instructions,
pint_t instructionsEnd,
const CIE_Info &cieInfo, pint_t pcoffset,
PrologInfoStackEntry *&rememberStack,
PrologInfo *results) {
const bool logDwarf = false;
pint_t p = instructions;
pint_t codeOffset = 0;
PrologInfo initialState = *results;
if (logDwarf)
fprintf(stderr, "parseInstructions(instructions=0x%0llX)\n",
(uint64_t) instructionsEnd);
// see Dwarf Spec, section 6.4.2 for details on unwind opcodes
while ((p < instructionsEnd) && (codeOffset < pcoffset)) {
uint64_t reg;
uint64_t reg2;
int64_t offset;
uint64_t length;
uint8_t opcode = addressSpace.get8(p);
uint8_t operand;
PrologInfoStackEntry *entry;
++p;
switch (opcode) {
case DW_CFA_nop:
if (logDwarf)
fprintf(stderr, "DW_CFA_nop\n");
break;
case DW_CFA_set_loc:
codeOffset =
addressSpace.getEncodedP(p, instructionsEnd, cieInfo.pointerEncoding);
if (logDwarf)
fprintf(stderr, "DW_CFA_set_loc\n");
break;
case DW_CFA_advance_loc1:
codeOffset += (addressSpace.get8(p) * cieInfo.codeAlignFactor);
p += 1;
if (logDwarf)
fprintf(stderr, "DW_CFA_advance_loc1: new offset=%llu\n",
(uint64_t)codeOffset);
break;
case DW_CFA_advance_loc2:
codeOffset += (addressSpace.get16(p) * cieInfo.codeAlignFactor);
p += 2;
if (logDwarf)
fprintf(stderr, "DW_CFA_advance_loc2: new offset=%llu\n",
(uint64_t)codeOffset);
break;
case DW_CFA_advance_loc4:
codeOffset += (addressSpace.get32(p) * cieInfo.codeAlignFactor);
p += 4;
if (logDwarf)
fprintf(stderr, "DW_CFA_advance_loc4: new offset=%llu\n",
(uint64_t)codeOffset);
break;
case DW_CFA_offset_extended:
reg = addressSpace.getULEB128(p, instructionsEnd);
offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd)
* cieInfo.dataAlignFactor;
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_offset_extended dwarf unwind, reg too big\n");
return false;
}
results->savedRegisters[reg].location = kRegisterInCFA;
results->savedRegisters[reg].value = offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_offset_extended(reg=%lld, offset=%lld)\n", reg,
offset);
break;
case DW_CFA_restore_extended:
reg = addressSpace.getULEB128(p, instructionsEnd);
;
if (reg > kMaxRegisterNumber) {
fprintf(
stderr,
"malformed DW_CFA_restore_extended dwarf unwind, reg too big\n");
return false;
}
results->savedRegisters[reg] = initialState.savedRegisters[reg];
if (logDwarf)
fprintf(stderr, "DW_CFA_restore_extended(reg=%lld)\n", reg);
break;
case DW_CFA_undefined:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_undefined dwarf unwind, reg too big\n");
return false;
}
results->savedRegisters[reg].location = kRegisterUnused;
if (logDwarf)
fprintf(stderr, "DW_CFA_undefined(reg=%lld)\n", reg);
break;
case DW_CFA_same_value:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_same_value dwarf unwind, reg too big\n");
return false;
}
// <rdar://problem/8456377> DW_CFA_same_value unsupported
// "same value" means register was stored in frame, but its current
// value has not changed, so no need to restore from frame.
// We model this as if the register was never saved.
results->savedRegisters[reg].location = kRegisterUnused;
// set flag to disable conversion to compact unwind
results->sameValueUsed = true;
if (logDwarf)
fprintf(stderr, "DW_CFA_same_value(reg=%lld)\n", reg);
break;
case DW_CFA_register:
reg = addressSpace.getULEB128(p, instructionsEnd);
reg2 = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_register dwarf unwind, reg too big\n");
return false;
}
if (reg2 > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_register dwarf unwind, reg2 too big\n");
return false;
}
results->savedRegisters[reg].location = kRegisterInRegister;
results->savedRegisters[reg].value = (int64_t)reg2;
// set flag to disable conversion to compact unwind
results->registersInOtherRegisters = true;
if (logDwarf)
fprintf(stderr, "DW_CFA_register(reg=%lld, reg2=%lld)\n", reg, reg2);
break;
case DW_CFA_remember_state:
// avoid operator new, because that would be an upward dependency
entry = (PrologInfoStackEntry *)malloc(sizeof(PrologInfoStackEntry));
if (entry != NULL) {
entry->next = rememberStack;
entry->info = *results;
rememberStack = entry;
} else {
return false;
}
if (logDwarf)
fprintf(stderr, "DW_CFA_remember_state\n");
break;
case DW_CFA_restore_state:
if (rememberStack != NULL) {
PrologInfoStackEntry *top = rememberStack;
*results = top->info;
rememberStack = top->next;
free((char *)top);
} else {
return false;
}
if (logDwarf)
fprintf(stderr, "DW_CFA_restore_state\n");
break;
case DW_CFA_def_cfa:
reg = addressSpace.getULEB128(p, instructionsEnd);
offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr, "malformed DW_CFA_def_cfa dwarf unwind, reg too big\n");
return false;
}
results->cfaRegister = (uint32_t)reg;
results->cfaRegisterOffset = (int32_t)offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_def_cfa(reg=%lld, offset=%lld)\n", reg, offset);
break;
case DW_CFA_def_cfa_register:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(
stderr,
"malformed DW_CFA_def_cfa_register dwarf unwind, reg too big\n");
return false;
}
results->cfaRegister = (uint32_t)reg;
if (logDwarf)
fprintf(stderr, "DW_CFA_def_cfa_register(%lld)\n", reg);
break;
case DW_CFA_def_cfa_offset:
results->cfaRegisterOffset = (int32_t)
addressSpace.getULEB128(p, instructionsEnd);
results->codeOffsetAtStackDecrement = (uint32_t)codeOffset;
if (logDwarf)
fprintf(stderr, "DW_CFA_def_cfa_offset(%d)\n",
results->cfaRegisterOffset);
break;
case DW_CFA_def_cfa_expression:
results->cfaRegister = 0;
results->cfaExpression = (int64_t)p;
length = addressSpace.getULEB128(p, instructionsEnd);
p += length;
if (logDwarf)
fprintf(stderr,
"DW_CFA_def_cfa_expression(expression=0x%llX, length=%llu)\n",
results->cfaExpression, length);
break;
case DW_CFA_expression:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_expression dwarf unwind, reg too big\n");
return false;
}
results->savedRegisters[reg].location = kRegisterAtExpression;
results->savedRegisters[reg].value = (int64_t)p;
length = addressSpace.getULEB128(p, instructionsEnd);
p += length;
if (logDwarf)
fprintf(stderr,
"DW_CFA_expression(reg=%lld, expression=0x%llX, length=%llu)\n",
reg, results->savedRegisters[reg].value, length);
break;
case DW_CFA_offset_extended_sf:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(
stderr,
"malformed DW_CFA_offset_extended_sf dwarf unwind, reg too big\n");
return false;
}
offset =
addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor;
results->savedRegisters[reg].location = kRegisterInCFA;
results->savedRegisters[reg].value = offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_offset_extended_sf(reg=%lld, offset=%lld)\n",
reg, offset);
break;
case DW_CFA_def_cfa_sf:
reg = addressSpace.getULEB128(p, instructionsEnd);
offset =
addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor;
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_def_cfa_sf dwarf unwind, reg too big\n");
return false;
}
results->cfaRegister = (uint32_t)reg;
results->cfaRegisterOffset = (int32_t)offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_def_cfa_sf(reg=%lld, offset=%lld)\n", reg,
offset);
break;
case DW_CFA_def_cfa_offset_sf:
results->cfaRegisterOffset = (int32_t)
(addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor);
results->codeOffsetAtStackDecrement = (uint32_t)codeOffset;
if (logDwarf)
fprintf(stderr, "DW_CFA_def_cfa_offset_sf(%d)\n",
results->cfaRegisterOffset);
break;
case DW_CFA_val_offset:
reg = addressSpace.getULEB128(p, instructionsEnd);
offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd)
* cieInfo.dataAlignFactor;
results->savedRegisters[reg].location = kRegisterOffsetFromCFA;
results->savedRegisters[reg].value = offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_val_offset(reg=%lld, offset=%lld\n", reg,
offset);
break;
case DW_CFA_val_offset_sf:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_val_offset_sf dwarf unwind, reg too big\n");
return false;
}
offset =
addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor;
results->savedRegisters[reg].location = kRegisterOffsetFromCFA;
results->savedRegisters[reg].value = offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_val_offset_sf(reg=%lld, offset=%lld\n", reg,
offset);
break;
case DW_CFA_val_expression:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr,
"malformed DW_CFA_val_expression dwarf unwind, reg too big\n");
return false;
}
results->savedRegisters[reg].location = kRegisterIsExpression;
results->savedRegisters[reg].value = (int64_t)p;
length = addressSpace.getULEB128(p, instructionsEnd);
p += length;
if (logDwarf)
fprintf(
stderr,
"DW_CFA_val_expression(reg=%lld, expression=0x%llX, length=%lld)\n",
reg, results->savedRegisters[reg].value, length);
break;
case DW_CFA_GNU_args_size:
length = addressSpace.getULEB128(p, instructionsEnd);
results->spExtraArgSize = (uint32_t)length;
if (logDwarf)
fprintf(stderr, "DW_CFA_GNU_args_size(%lld)\n", length);
break;
case DW_CFA_GNU_negative_offset_extended:
reg = addressSpace.getULEB128(p, instructionsEnd);
if (reg > kMaxRegisterNumber) {
fprintf(stderr, "malformed DW_CFA_GNU_negative_offset_extended dwarf "
"unwind, reg too big\n");
return false;
}
offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd)
* cieInfo.dataAlignFactor;
results->savedRegisters[reg].location = kRegisterInCFA;
results->savedRegisters[reg].value = -offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_GNU_negative_offset_extended(%lld)\n", offset);
break;
default:
operand = opcode & 0x3F;
switch (opcode & 0xC0) {
case DW_CFA_offset:
reg = operand;
offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd)
* cieInfo.dataAlignFactor;
results->savedRegisters[reg].location = kRegisterInCFA;
results->savedRegisters[reg].value = offset;
if (logDwarf)
fprintf(stderr, "DW_CFA_offset(reg=%d, offset=%lld)\n", operand,
offset);
break;
case DW_CFA_advance_loc:
codeOffset += operand * cieInfo.codeAlignFactor;
if (logDwarf)
fprintf(stderr, "DW_CFA_advance_loc: new offset=%llu\n",
(uint64_t)codeOffset);
break;
case DW_CFA_restore:
reg = operand;
results->savedRegisters[reg] = initialState.savedRegisters[reg];
if (logDwarf)
fprintf(stderr, "DW_CFA_restore(reg=%lld)\n", reg);
break;
default:
if (logDwarf)
fprintf(stderr, "unknown CFA opcode 0x%02X\n", opcode);
return false;
}
}
}
return true;
}
} // namespace libunwind
#endif // __DWARF_PARSER_HPP__

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//===--------------------------- Unwind-sjlj.c ----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Implements setjump-longjump based C++ exceptions
//
//===----------------------------------------------------------------------===//
#include <unwind.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include "config.h"
#include "unwind_ext.h"
//
// 32-bit iOS uses setjump/longjump based C++ exceptions.
// Other architectures use "zero cost" exceptions.
//
// With SJLJ based exceptions, any function that has a catch clause or needs to
// do any clean up when an exception propagates through it, needs to call
// _Unwind_SjLj_Register() at the start of the function and
// _Unwind_SjLj_Unregister() at the end. The register function is called with
// the address of a block of memory in the function's stack frame. The runtime
// keeps a linked list (stack) of these blocks - one per thread. The calling
// function also sets the personality and lsda fields of the block.
//
#if _LIBUNWIND_BUILD_SJLJ_APIS
struct _Unwind_FunctionContext {
// next function in stack of handlers
struct _Unwind_FunctionContext *prev;
// set by calling function before registering to be the landing pad
uintptr_t resumeLocation;
// set by personality handler to be parameters passed to landing pad function
uintptr_t resumeParameters[4];
// set by calling function before registering
__personality_routine personality; // arm offset=24
uintptr_t lsda; // arm offset=28
// variable length array, contains registers to restore
// 0 = r7, 1 = pc, 2 = sp
void *jbuf[];
};
/// Called at start of each function that catches exceptions
_LIBUNWIND_EXPORT void
_Unwind_SjLj_Register(struct _Unwind_FunctionContext *fc) {
fc->prev = __Unwind_SjLj_GetTopOfFunctionStack();
__Unwind_SjLj_SetTopOfFunctionStack(fc);
}
/// Called at end of each function that catches exceptions
_LIBUNWIND_EXPORT void
_Unwind_SjLj_Unregister(struct _Unwind_FunctionContext *fc) {
__Unwind_SjLj_SetTopOfFunctionStack(fc->prev);
}
static _Unwind_Reason_Code
unwind_phase1(struct _Unwind_Exception *exception_object) {
_Unwind_FunctionContext_t c = __Unwind_SjLj_GetTopOfFunctionStack();
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1: initial function-context=%p\n", c);
// walk each frame looking for a place to stop
for (bool handlerNotFound = true; handlerNotFound; c = c->prev) {
// check for no more frames
if (c == NULL) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): reached "
"bottom => _URC_END_OF_STACK\n",
exception_object);
return _URC_END_OF_STACK;
}
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1: function-context=%p\n", c);
// if there is a personality routine, ask it if it will want to stop at this
// frame
if (c->personality != NULL) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): calling "
"personality function %p\n",
exception_object, c->personality);
_Unwind_Reason_Code personalityResult = (*c->personality)(
1, _UA_SEARCH_PHASE, exception_object->exception_class,
exception_object, (struct _Unwind_Context *)c);
switch (personalityResult) {
case _URC_HANDLER_FOUND:
// found a catch clause or locals that need destructing in this frame
// stop search and remember function context
handlerNotFound = false;
exception_object->private_2 = (uintptr_t) c;
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): "
"_URC_HANDLER_FOUND\n", exception_object);
return _URC_NO_REASON;
case _URC_CONTINUE_UNWIND:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): "
"_URC_CONTINUE_UNWIND\n", exception_object);
// continue unwinding
break;
default:
// something went wrong
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase1(ex_ojb=%p): _URC_FATAL_PHASE1_ERROR\n",
exception_object);
return _URC_FATAL_PHASE1_ERROR;
}
}
}
return _URC_NO_REASON;
}
static _Unwind_Reason_Code
unwind_phase2(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p)\n", exception_object);
// walk each frame until we reach where search phase said to stop
_Unwind_FunctionContext_t c = __Unwind_SjLj_GetTopOfFunctionStack();
while (true) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2s(ex_ojb=%p): context=%p\n",
exception_object, c);
// check for no more frames
if (c == NULL) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached "
"bottom => _URC_END_OF_STACK\n",
exception_object);
return _URC_END_OF_STACK;
}
// if there is a personality routine, tell it we are unwinding
if (c->personality != NULL) {
_Unwind_Action action = _UA_CLEANUP_PHASE;
if ((uintptr_t) c == exception_object->private_2)
action = (_Unwind_Action)(
_UA_CLEANUP_PHASE |
_UA_HANDLER_FRAME); // tell personality this was the frame it marked
// in phase 1
_Unwind_Reason_Code personalityResult =
(*c->personality)(1, action, exception_object->exception_class,
exception_object, (struct _Unwind_Context *)c);
switch (personalityResult) {
case _URC_CONTINUE_UNWIND:
// continue unwinding
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2(ex_ojb=%p): _URC_CONTINUE_UNWIND\n",
exception_object);
if ((uintptr_t) c == exception_object->private_2) {
// phase 1 said we would stop at this frame, but we did not...
_LIBUNWIND_ABORT("during phase1 personality function said it would "
"stop here, but now if phase2 it did not stop here");
}
break;
case _URC_INSTALL_CONTEXT:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): "
"_URC_INSTALL_CONTEXT, will resume at "
"landing pad %p\n",
exception_object, c->jbuf[1]);
// personality routine says to transfer control to landing pad
// we may get control back if landing pad calls _Unwind_Resume()
__Unwind_SjLj_SetTopOfFunctionStack(c);
__builtin_longjmp(c->jbuf, 1);
// unw_resume() only returns if there was an error
return _URC_FATAL_PHASE2_ERROR;
default:
// something went wrong
_LIBUNWIND_DEBUG_LOG("personality function returned unknown result %d",
personalityResult);
return _URC_FATAL_PHASE2_ERROR;
}
}
c = c->prev;
}
// clean up phase did not resume at the frame that the search phase said it
// would
return _URC_FATAL_PHASE2_ERROR;
}
static _Unwind_Reason_Code
unwind_phase2_forced(struct _Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter) {
// walk each frame until we reach where search phase said to stop
_Unwind_FunctionContext_t c = __Unwind_SjLj_GetTopOfFunctionStack();
while (true) {
// get next frame (skip over first which is _Unwind_RaiseException)
if (c == NULL) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached "
"bottom => _URC_END_OF_STACK\n",
exception_object);
return _URC_END_OF_STACK;
}
// call stop function at each frame
_Unwind_Action action =
(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE);
_Unwind_Reason_Code stopResult =
(*stop)(1, action, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)c, stop_parameter);
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"stop function returned %d\n",
exception_object, stopResult);
if (stopResult != _URC_NO_REASON) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"stopped by stop function\n",
exception_object);
return _URC_FATAL_PHASE2_ERROR;
}
// if there is a personality routine, tell it we are unwinding
if (c->personality != NULL) {
__personality_routine p = (__personality_routine) c->personality;
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"calling personality function %p\n",
exception_object, p);
_Unwind_Reason_Code personalityResult =
(*p)(1, action, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)c);
switch (personalityResult) {
case _URC_CONTINUE_UNWIND:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned _URC_CONTINUE_UNWIND\n",
exception_object);
// destructors called, continue unwinding
break;
case _URC_INSTALL_CONTEXT:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned _URC_INSTALL_CONTEXT\n",
exception_object);
// we may get control back if landing pad calls _Unwind_Resume()
__Unwind_SjLj_SetTopOfFunctionStack(c);
__builtin_longjmp(c->jbuf, 1);
break;
default:
// something went wrong
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned %d, "
"_URC_FATAL_PHASE2_ERROR\n",
exception_object, personalityResult);
return _URC_FATAL_PHASE2_ERROR;
}
}
c = c->prev;
}
// call stop function one last time and tell it we've reached the end of the
// stack
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): calling stop "
"function with _UA_END_OF_STACK\n",
exception_object);
_Unwind_Action lastAction =
(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE | _UA_END_OF_STACK);
(*stop)(1, lastAction, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)c, stop_parameter);
// clean up phase did not resume at the frame that the search phase said it
// would
return _URC_FATAL_PHASE2_ERROR;
}
/// Called by __cxa_throw. Only returns if there is a fatal error
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_SjLj_RaiseException(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_SjLj_RaiseException(ex_obj=%p)\n", exception_object);
// mark that this is a non-forced unwind, so _Unwind_Resume() can do the right
// thing
exception_object->private_1 = 0;
exception_object->private_2 = 0;
// phase 1: the search phase
_Unwind_Reason_Code phase1 = unwind_phase1(exception_object);
if (phase1 != _URC_NO_REASON)
return phase1;
// phase 2: the clean up phase
return unwind_phase2(exception_object);
}
/// When _Unwind_RaiseException() is in phase2, it hands control
/// to the personality function at each frame. The personality
/// may force a jump to a landing pad in that function, the landing
/// pad code may then call _Unwind_Resume() to continue with the
/// unwinding. Note: the call to _Unwind_Resume() is from compiler
/// geneated user code. All other _Unwind_* routines are called
/// by the C++ runtime __cxa_* routines.
///
/// Re-throwing an exception is implemented by having the code call
/// __cxa_rethrow() which in turn calls _Unwind_Resume_or_Rethrow()
_LIBUNWIND_EXPORT void
_Unwind_SjLj_Resume(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_SjLj_Resume(ex_obj=%p)\n", exception_object);
if (exception_object->private_1 != 0)
unwind_phase2_forced(exception_object,
(_Unwind_Stop_Fn) exception_object->private_1,
(void *)exception_object->private_2);
else
unwind_phase2(exception_object);
// clients assume _Unwind_Resume() does not return, so all we can do is abort.
_LIBUNWIND_ABORT("_Unwind_SjLj_Resume() can't return");
}
/// Called by __cxa_rethrow().
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("__Unwind_SjLj_Resume_or_Rethrow(ex_obj=%p), "
"private_1=%ld\n",
exception_object, exception_object->private_1);
// If this is non-forced and a stopping place was found, then this is a
// re-throw.
// Call _Unwind_RaiseException() as if this was a new exception.
if (exception_object->private_1 == 0) {
return _Unwind_SjLj_RaiseException(exception_object);
// should return if there is no catch clause, so that __cxa_rethrow can call
// std::terminate()
}
// Call through to _Unwind_Resume() which distiguishes between forced and
// regular exceptions.
_Unwind_SjLj_Resume(exception_object);
_LIBUNWIND_ABORT("__Unwind_SjLj_Resume_or_Rethrow() called "
"_Unwind_SjLj_Resume() which unexpectedly returned");
}
/// Called by personality handler during phase 2 to get LSDA for current frame.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
_Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
_LIBUNWIND_TRACE_API("_Unwind_GetLanguageSpecificData(context=%p) "
"=> 0x%0lX\n", context, ufc->lsda);
return ufc->lsda;
}
/// Called by personality handler during phase 2 to get register values.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetGR(struct _Unwind_Context *context,
int index) {
_LIBUNWIND_TRACE_API("_Unwind_GetGR(context=%p, reg=%d)\n",
context, index);
_Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
return ufc->resumeParameters[index];
}
/// Called by personality handler during phase 2 to alter register values.
_LIBUNWIND_EXPORT void _Unwind_SetGR(struct _Unwind_Context *context, int index,
uintptr_t new_value) {
_LIBUNWIND_TRACE_API("_Unwind_SetGR(context=%p, reg=%d, value=0x%0lX)\n"
, context, index, new_value);
_Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
ufc->resumeParameters[index] = new_value;
}
/// Called by personality handler during phase 2 to get instruction pointer.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
_Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
_LIBUNWIND_TRACE_API("_Unwind_GetIP(context=%p) => 0x%lX\n", context,
ufc->resumeLocation + 1);
return ufc->resumeLocation + 1;
}
/// Called by personality handler during phase 2 to get instruction pointer.
/// ipBefore is a boolean that says if IP is already adjusted to be the call
/// site address. Normally IP is the return address.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context,
int *ipBefore) {
_Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
*ipBefore = 0;
_LIBUNWIND_TRACE_API("_Unwind_GetIPInfo(context=%p, %p) => 0x%lX\n",
context, ipBefore, ufc->resumeLocation + 1);
return ufc->resumeLocation + 1;
}
/// Called by personality handler during phase 2 to alter instruction pointer.
_LIBUNWIND_EXPORT void _Unwind_SetIP(struct _Unwind_Context *context,
uintptr_t new_value) {
_LIBUNWIND_TRACE_API("_Unwind_SetIP(context=%p, value=0x%0lX)\n",
context, new_value);
_Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
ufc->resumeLocation = new_value - 1;
}
/// Called by personality handler during phase 2 to find the start of the
/// function.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetRegionStart(struct _Unwind_Context *context) {
// Not supported or needed for sjlj based unwinding
(void)context;
_LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p)\n", context);
return 0;
}
/// Called by personality handler during phase 2 if a foreign exception
/// is caught.
_LIBUNWIND_EXPORT void
_Unwind_DeleteException(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_DeleteException(ex_obj=%p)\n",
exception_object);
if (exception_object->exception_cleanup != NULL)
(*exception_object->exception_cleanup)(_URC_FOREIGN_EXCEPTION_CAUGHT,
exception_object);
}
/// Called by personality handler during phase 2 to get base address for data
/// relative encodings.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetDataRelBase(struct _Unwind_Context *context) {
// Not supported or needed for sjlj based unwinding
(void)context;
_LIBUNWIND_TRACE_API("_Unwind_GetDataRelBase(context=%p)\n", context);
_LIBUNWIND_ABORT("_Unwind_GetDataRelBase() not implemented");
}
/// Called by personality handler during phase 2 to get base address for text
/// relative encodings.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetTextRelBase(struct _Unwind_Context *context) {
// Not supported or needed for sjlj based unwinding
(void)context;
_LIBUNWIND_TRACE_API("_Unwind_GetTextRelBase(context=%p)\n", context);
_LIBUNWIND_ABORT("_Unwind_GetTextRelBase() not implemented");
}
/// Called by personality handler to get "Call Frame Area" for current frame.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetCFA(struct _Unwind_Context *context) {
_LIBUNWIND_TRACE_API("_Unwind_GetCFA(context=%p)\n", context);
if (context != NULL) {
_Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
// Setjmp/longjmp based exceptions don't have a true CFA.
// Instead, the SP in the jmpbuf is the closest approximation.
return (uintptr_t) ufc->jbuf[2];
}
return 0;
}
#endif // _LIBUNWIND_BUILD_SJLJ_APIS

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//===--------------------- UnwindLevel1-gcc-ext.c -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Implements gcc extensions to the C++ ABI Exception Handling Level 1.
//
//===----------------------------------------------------------------------===//
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include "libunwind.h"
#include "unwind.h"
#include "libunwind_ext.h"
#include "config.h"
#if _LIBUNWIND_BUILD_ZERO_COST_APIS
/// Called by __cxa_rethrow().
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_Resume_or_Rethrow(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_Resume_or_Rethrow(ex_obj=%p), "
"private_1=%ld\n",
exception_object, exception_object->private_1);
// If this is non-forced and a stopping place was found, then this is a
// re-throw.
// Call _Unwind_RaiseException() as if this was a new exception
if (exception_object->private_1 == 0) {
return _Unwind_RaiseException(exception_object);
// Will return if there is no catch clause, so that __cxa_rethrow can call
// std::terminate().
}
// Call through to _Unwind_Resume() which distiguishes between forced and
// regular exceptions.
_Unwind_Resume(exception_object);
_LIBUNWIND_ABORT("_Unwind_Resume_or_Rethrow() called _Unwind_RaiseException()"
" which unexpectedly returned");
}
/// Called by personality handler during phase 2 to get base address for data
/// relative encodings.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetDataRelBase(struct _Unwind_Context *context) {
(void)context;
_LIBUNWIND_TRACE_API("_Unwind_GetDataRelBase(context=%p)\n", context);
_LIBUNWIND_ABORT("_Unwind_GetDataRelBase() not implemented");
}
/// Called by personality handler during phase 2 to get base address for text
/// relative encodings.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetTextRelBase(struct _Unwind_Context *context) {
(void)context;
_LIBUNWIND_TRACE_API("_Unwind_GetTextRelBase(context=%p)\n", context);
_LIBUNWIND_ABORT("_Unwind_GetTextRelBase() not implemented");
}
/// Scans unwind information to find the function that contains the
/// specified code address "pc".
_LIBUNWIND_EXPORT void *_Unwind_FindEnclosingFunction(void *pc) {
_LIBUNWIND_TRACE_API("_Unwind_FindEnclosingFunction(pc=%p)\n", pc);
// This is slow, but works.
// We create an unwind cursor then alter the IP to be pc
unw_cursor_t cursor;
unw_context_t uc;
unw_proc_info_t info;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)(long) pc);
if (unw_get_proc_info(&cursor, &info) == UNW_ESUCCESS)
return (void *)(long) info.start_ip;
else
return NULL;
}
/// Walk every frame and call trace function at each one. If trace function
/// returns anything other than _URC_NO_REASON, then walk is terminated.
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_Backtrace(_Unwind_Trace_Fn callback, void *ref) {
unw_cursor_t cursor;
unw_context_t uc;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
_LIBUNWIND_TRACE_API("_Unwind_Backtrace(callback=%p)\n", callback);
// walk each frame
while (true) {
// ask libuwind to get next frame (skip over first frame which is
// _Unwind_Backtrace())
if (unw_step(&cursor) <= 0) {
_LIBUNWIND_TRACE_UNWINDING(" _backtrace: ended because cursor reached "
"bottom of stack, returning %d\n",
_URC_END_OF_STACK);
return _URC_END_OF_STACK;
}
// debugging
if (_LIBUNWIND_TRACING_UNWINDING) {
char functionName[512];
unw_proc_info_t frameInfo;
unw_word_t offset;
unw_get_proc_name(&cursor, functionName, 512, &offset);
unw_get_proc_info(&cursor, &frameInfo);
_LIBUNWIND_TRACE_UNWINDING(
" _backtrace: start_ip=0x%llX, func=%s, lsda=0x%llX, context=%p\n",
frameInfo.start_ip, functionName, frameInfo.lsda, &cursor);
}
// call trace function with this frame
_Unwind_Reason_Code result =
(*callback)((struct _Unwind_Context *)(&cursor), ref);
if (result != _URC_NO_REASON) {
_LIBUNWIND_TRACE_UNWINDING(" _backtrace: ended because callback "
"returned %d\n",
result);
return result;
}
}
}
/// Find dwarf unwind info for an address 'pc' in some function.
_LIBUNWIND_EXPORT const void *_Unwind_Find_FDE(const void *pc,
struct dwarf_eh_bases *bases) {
// This is slow, but works.
// We create an unwind cursor then alter the IP to be pc
unw_cursor_t cursor;
unw_context_t uc;
unw_proc_info_t info;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)(long) pc);
unw_get_proc_info(&cursor, &info);
bases->tbase = (uintptr_t)info.extra;
bases->dbase = 0; // dbase not used on Mac OS X
bases->func = (uintptr_t)info.start_ip;
_LIBUNWIND_TRACE_API("_Unwind_Find_FDE(pc=%p) => %p\n", pc,
(void *)(long) info.unwind_info);
return (void *)(long) info.unwind_info;
}
/// Returns the CFA (call frame area, or stack pointer at start of function)
/// for the current context.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetCFA(struct _Unwind_Context *context) {
unw_cursor_t *cursor = (unw_cursor_t *)context;
unw_word_t result;
unw_get_reg(cursor, UNW_REG_SP, &result);
_LIBUNWIND_TRACE_API("_Unwind_GetCFA(context=%p) => 0x%llX\n", context,
(uint64_t) result);
return (uintptr_t)result;
}
/// Called by personality handler during phase 2 to get instruction pointer.
/// ipBefore is a boolean that says if IP is already adjusted to be the call
/// site address. Normally IP is the return address.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context,
int *ipBefore) {
_LIBUNWIND_TRACE_API("_Unwind_GetIPInfo(context=%p)\n", context);
*ipBefore = 0;
return _Unwind_GetIP(context);
}
#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
/// Called by programs with dynamic code generators that want
/// to register a dynamically generated FDE.
/// This function has existed on Mac OS X since 10.4, but
/// was broken until 10.6.
_LIBUNWIND_EXPORT void __register_frame(const void *fde) {
_LIBUNWIND_TRACE_API("__register_frame(%p)\n", fde);
_unw_add_dynamic_fde((unw_word_t)(uintptr_t) fde);
}
/// Called by programs with dynamic code generators that want
/// to unregister a dynamically generated FDE.
/// This function has existed on Mac OS X since 10.4, but
/// was broken until 10.6.
_LIBUNWIND_EXPORT void __deregister_frame(const void *fde) {
_LIBUNWIND_TRACE_API("__deregister_frame(%p)\n", fde);
_unw_remove_dynamic_fde((unw_word_t)(uintptr_t) fde);
}
// The following register/deregister functions are gcc extensions.
// They have existed on Mac OS X, but have never worked because Mac OS X
// before 10.6 used keymgr to track known FDEs, but these functions
// never got updated to use keymgr.
// For now, we implement these as do-nothing functions to keep any existing
// applications working. We also add the not in 10.6 symbol so that nwe
// application won't be able to use them.
#if _LIBUNWIND_SUPPORT_FRAME_APIS
_LIBUNWIND_EXPORT void __register_frame_info_bases(const void *fde, void *ob,
void *tb, void *db) {
(void)fde;
(void)ob;
(void)tb;
(void)db;
_LIBUNWIND_TRACE_API("__register_frame_info_bases(%p,%p, %p, %p)\n",
fde, ob, tb, db);
// do nothing, this function never worked in Mac OS X
}
_LIBUNWIND_EXPORT void __register_frame_info(const void *fde, void *ob) {
(void)fde;
(void)ob;
_LIBUNWIND_TRACE_API("__register_frame_info(%p, %p)\n", fde, ob);
// do nothing, this function never worked in Mac OS X
}
_LIBUNWIND_EXPORT void __register_frame_info_table_bases(const void *fde,
void *ob, void *tb,
void *db) {
(void)fde;
(void)ob;
(void)tb;
(void)db;
_LIBUNWIND_TRACE_API("__register_frame_info_table_bases"
"(%p,%p, %p, %p)\n", fde, ob, tb, db);
// do nothing, this function never worked in Mac OS X
}
_LIBUNWIND_EXPORT void __register_frame_info_table(const void *fde, void *ob) {
(void)fde;
(void)ob;
_LIBUNWIND_TRACE_API("__register_frame_info_table(%p, %p)\n", fde, ob);
// do nothing, this function never worked in Mac OS X
}
_LIBUNWIND_EXPORT void __register_frame_table(const void *fde) {
(void)fde;
_LIBUNWIND_TRACE_API("__register_frame_table(%p)\n", fde);
// do nothing, this function never worked in Mac OS X
}
_LIBUNWIND_EXPORT void *__deregister_frame_info(const void *fde) {
(void)fde;
_LIBUNWIND_TRACE_API("__deregister_frame_info(%p)\n", fde);
// do nothing, this function never worked in Mac OS X
return NULL;
}
_LIBUNWIND_EXPORT void *__deregister_frame_info_bases(const void *fde) {
(void)fde;
_LIBUNWIND_TRACE_API("__deregister_frame_info_bases(%p)\n", fde);
// do nothing, this function never worked in Mac OS X
return NULL;
}
#endif // _LIBUNWIND_SUPPORT_FRAME_APIS
#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS

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//===------------------------- UnwindLevel1.c -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Implements C++ ABI Exception Handling Level 1 as documented at:
// http://mentorembedded.github.io/cxx-abi/abi-eh.html
// using libunwind
//
//===----------------------------------------------------------------------===//
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "libunwind.h"
#include "unwind.h"
#include "config.h"
#if _LIBUNWIND_BUILD_ZERO_COST_APIS
static _Unwind_Reason_Code
unwind_phase1(unw_context_t *uc, struct _Unwind_Exception *exception_object) {
unw_cursor_t cursor1;
unw_init_local(&cursor1, uc);
// Walk each frame looking for a place to stop.
for (bool handlerNotFound = true; handlerNotFound;) {
// Ask libuwind to get next frame (skip over first which is
// _Unwind_RaiseException).
int stepResult = unw_step(&cursor1);
if (stepResult == 0) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_step() reached "
"bottom => _URC_END_OF_STACK\n",
exception_object);
return _URC_END_OF_STACK;
} else if (stepResult < 0) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_step failed => "
"_URC_FATAL_PHASE1_ERROR\n",
exception_object);
return _URC_FATAL_PHASE1_ERROR;
}
// See if frame has code to run (has personality routine).
unw_proc_info_t frameInfo;
unw_word_t sp;
if (unw_get_proc_info(&cursor1, &frameInfo) != UNW_ESUCCESS) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_get_proc_info "
"failed => _URC_FATAL_PHASE1_ERROR\n",
exception_object);
return _URC_FATAL_PHASE1_ERROR;
}
// When tracing, print state information.
if (_LIBUNWIND_TRACING_UNWINDING) {
char functionName[512];
unw_word_t offset;
if ((unw_get_proc_name(&cursor1, functionName, 512, &offset) !=
UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
strcpy(functionName, ".anonymous.");
unw_word_t pc;
unw_get_reg(&cursor1, UNW_REG_IP, &pc);
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase1(ex_ojb=%p): pc=0x%llX, start_ip=0x%llX, func=%s, "
"lsda=0x%llX, personality=0x%llX\n",
exception_object, pc, frameInfo.start_ip, functionName,
frameInfo.lsda, frameInfo.handler);
}
// If there is a personality routine, ask it if it will want to stop at
// this frame.
if (frameInfo.handler != 0) {
__personality_routine p =
(__personality_routine)(long)(frameInfo.handler);
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase1(ex_ojb=%p): calling personality function %p\n",
exception_object, p);
_Unwind_Reason_Code personalityResult =
(*p)(1, _UA_SEARCH_PHASE, exception_object->exception_class,
exception_object, (struct _Unwind_Context *)(&cursor1));
switch (personalityResult) {
case _URC_HANDLER_FOUND:
// found a catch clause or locals that need destructing in this frame
// stop search and remember stack pointer at the frame
handlerNotFound = false;
unw_get_reg(&cursor1, UNW_REG_SP, &sp);
exception_object->private_2 = (uintptr_t)sp;
_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): "
"_URC_HANDLER_FOUND \n",
exception_object);
return _URC_NO_REASON;
case _URC_CONTINUE_UNWIND:
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase1(ex_ojb=%p): _URC_CONTINUE_UNWIND\n",
exception_object);
// continue unwinding
break;
default:
// something went wrong
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase1(ex_ojb=%p): _URC_FATAL_PHASE1_ERROR\n",
exception_object);
return _URC_FATAL_PHASE1_ERROR;
}
}
}
return _URC_NO_REASON;
}
static _Unwind_Reason_Code
unwind_phase2(unw_context_t *uc, struct _Unwind_Exception *exception_object) {
unw_cursor_t cursor2;
unw_init_local(&cursor2, uc);
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p)\n", exception_object);
// Walk each frame until we reach where search phase said to stop.
while (true) {
// Ask libuwind to get next frame (skip over first which is
// _Unwind_RaiseException).
int stepResult = unw_step(&cursor2);
if (stepResult == 0) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached "
"bottom => _URC_END_OF_STACK\n",
exception_object);
return _URC_END_OF_STACK;
} else if (stepResult < 0) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step failed => "
"_URC_FATAL_PHASE1_ERROR\n",
exception_object);
return _URC_FATAL_PHASE2_ERROR;
}
// Get info about this frame.
unw_word_t sp;
unw_proc_info_t frameInfo;
unw_get_reg(&cursor2, UNW_REG_SP, &sp);
if (unw_get_proc_info(&cursor2, &frameInfo) != UNW_ESUCCESS) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_get_proc_info "
"failed => _URC_FATAL_PHASE1_ERROR\n",
exception_object);
return _URC_FATAL_PHASE2_ERROR;
}
// When tracing, print state information.
if (_LIBUNWIND_TRACING_UNWINDING) {
char functionName[512];
unw_word_t offset;
if ((unw_get_proc_name(&cursor2, functionName, 512, &offset) !=
UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
strcpy(functionName, ".anonymous.");
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2(ex_ojb=%p): start_ip=0x%llX, func=%s, sp=0x%llX, "
"lsda=0x%llX, personality=0x%llX\n",
exception_object, frameInfo.start_ip, functionName, sp,
frameInfo.lsda, frameInfo.handler);
}
// If there is a personality routine, tell it we are unwinding.
if (frameInfo.handler != 0) {
__personality_routine p =
(__personality_routine)(long)(frameInfo.handler);
_Unwind_Action action = _UA_CLEANUP_PHASE;
if (sp == exception_object->private_2) {
// Tell personality this was the frame it marked in phase 1.
action = (_Unwind_Action)(_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME);
}
_Unwind_Reason_Code personalityResult =
(*p)(1, action, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)(&cursor2));
switch (personalityResult) {
case _URC_CONTINUE_UNWIND:
// Continue unwinding
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2(ex_ojb=%p): _URC_CONTINUE_UNWIND\n",
exception_object);
if (sp == exception_object->private_2) {
// Phase 1 said we would stop at this frame, but we did not...
_LIBUNWIND_ABORT("during phase1 personality function said it would "
"stop here, but now if phase2 it did not stop here");
}
break;
case _URC_INSTALL_CONTEXT:
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2(ex_ojb=%p): _URC_INSTALL_CONTEXT\n",
exception_object);
// Personality routine says to transfer control to landing pad.
// We may get control back if landing pad calls _Unwind_Resume().
if (_LIBUNWIND_TRACING_UNWINDING) {
unw_word_t pc;
unw_get_reg(&cursor2, UNW_REG_IP, &pc);
unw_get_reg(&cursor2, UNW_REG_SP, &sp);
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): re-entering "
"user code with ip=0x%llX, sp=0x%llX\n",
exception_object, pc, sp);
}
unw_resume(&cursor2);
// unw_resume() only returns if there was an error.
return _URC_FATAL_PHASE2_ERROR;
default:
// Personality routine returned an unknown result code.
_LIBUNWIND_DEBUG_LOG("personality function returned unknown result %d",
personalityResult);
return _URC_FATAL_PHASE2_ERROR;
}
}
}
// Clean up phase did not resume at the frame that the search phase
// said it would...
return _URC_FATAL_PHASE2_ERROR;
}
static _Unwind_Reason_Code
unwind_phase2_forced(unw_context_t *uc,
struct _Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter) {
unw_cursor_t cursor2;
unw_init_local(&cursor2, uc);
// Walk each frame until we reach where search phase said to stop
while (unw_step(&cursor2) > 0) {
// Update info about this frame.
unw_proc_info_t frameInfo;
if (unw_get_proc_info(&cursor2, &frameInfo) != UNW_ESUCCESS) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): unw_step "
"failed => _URC_END_OF_STACK\n",
exception_object);
return _URC_FATAL_PHASE1_ERROR;
}
// When tracing, print state information.
if (_LIBUNWIND_TRACING_UNWINDING) {
char functionName[512];
unw_word_t offset;
if ((unw_get_proc_name(&cursor2, functionName, 512, &offset) !=
UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
strcpy(functionName, ".anonymous.");
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"start_ip=0x%llX, func=%s, lsda=0x%llX, "
" personality=0x%llX\n",
exception_object, frameInfo.start_ip,
functionName, frameInfo.lsda,
frameInfo.handler);
}
// Call stop function at each frame.
_Unwind_Action action =
(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE);
_Unwind_Reason_Code stopResult =
(*stop)(1, action, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)(&cursor2), stop_parameter);
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2_forced(ex_ojb=%p): stop function returned %d\n",
exception_object, stopResult);
if (stopResult != _URC_NO_REASON) {
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2_forced(ex_ojb=%p): stopped by stop function\n",
exception_object);
return _URC_FATAL_PHASE2_ERROR;
}
// If there is a personality routine, tell it we are unwinding.
if (frameInfo.handler != 0) {
__personality_routine p =
(__personality_routine)(long)(frameInfo.handler);
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2_forced(ex_ojb=%p): calling personality function %p\n",
exception_object, p);
_Unwind_Reason_Code personalityResult =
(*p)(1, action, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)(&cursor2));
switch (personalityResult) {
case _URC_CONTINUE_UNWIND:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned _URC_CONTINUE_UNWIND\n",
exception_object);
// Destructors called, continue unwinding
break;
case _URC_INSTALL_CONTEXT:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned _URC_INSTALL_CONTEXT\n",
exception_object);
// We may get control back if landing pad calls _Unwind_Resume().
unw_resume(&cursor2);
break;
default:
// Personality routine returned an unknown result code.
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned %d, "
"_URC_FATAL_PHASE2_ERROR\n",
exception_object, personalityResult);
return _URC_FATAL_PHASE2_ERROR;
}
}
}
// Call stop function one last time and tell it we've reached the end
// of the stack.
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): calling stop "
"function with _UA_END_OF_STACK\n",
exception_object);
_Unwind_Action lastAction =
(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE | _UA_END_OF_STACK);
(*stop)(1, lastAction, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)(&cursor2), stop_parameter);
// Clean up phase did not resume at the frame that the search phase said it
// would.
return _URC_FATAL_PHASE2_ERROR;
}
/// Called by __cxa_throw. Only returns if there is a fatal error.
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_RaiseException(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_RaiseException(ex_obj=%p)\n",
exception_object);
unw_context_t uc;
unw_getcontext(&uc);
// Mark that this is a non-forced unwind, so _Unwind_Resume()
// can do the right thing.
exception_object->private_1 = 0;
exception_object->private_2 = 0;
// phase 1: the search phase
_Unwind_Reason_Code phase1 = unwind_phase1(&uc, exception_object);
if (phase1 != _URC_NO_REASON)
return phase1;
// phase 2: the clean up phase
return unwind_phase2(&uc, exception_object);
}
/// When _Unwind_RaiseException() is in phase2, it hands control
/// to the personality function at each frame. The personality
/// may force a jump to a landing pad in that function, the landing
/// pad code may then call _Unwind_Resume() to continue with the
/// unwinding. Note: the call to _Unwind_Resume() is from compiler
/// geneated user code. All other _Unwind_* routines are called
/// by the C++ runtime __cxa_* routines.
///
/// Note: re-throwing an exception (as opposed to continuing the unwind)
/// is implemented by having the code call __cxa_rethrow() which
/// in turn calls _Unwind_Resume_or_Rethrow().
_LIBUNWIND_EXPORT void
_Unwind_Resume(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_Resume(ex_obj=%p)\n", exception_object);
unw_context_t uc;
unw_getcontext(&uc);
if (exception_object->private_1 != 0)
unwind_phase2_forced(&uc, exception_object,
(_Unwind_Stop_Fn) exception_object->private_1,
(void *)exception_object->private_2);
else
unwind_phase2(&uc, exception_object);
// Clients assume _Unwind_Resume() does not return, so all we can do is abort.
_LIBUNWIND_ABORT("_Unwind_Resume() can't return");
}
/// Not used by C++.
/// Unwinds stack, calling "stop" function at each frame.
/// Could be used to implement longjmp().
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_ForcedUnwind(struct _Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter) {
_LIBUNWIND_TRACE_API("_Unwind_ForcedUnwind(ex_obj=%p, stop=%p)\n",
exception_object, stop);
unw_context_t uc;
unw_getcontext(&uc);
// Mark that this is a forced unwind, so _Unwind_Resume() can do
// the right thing.
exception_object->private_1 = (uintptr_t) stop;
exception_object->private_2 = (uintptr_t) stop_parameter;
// do it
return unwind_phase2_forced(&uc, exception_object, stop, stop_parameter);
}
/// Called by personality handler during phase 2 to get LSDA for current frame.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
unw_cursor_t *cursor = (unw_cursor_t *)context;
unw_proc_info_t frameInfo;
uintptr_t result = 0;
if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
result = (uintptr_t)frameInfo.lsda;
_LIBUNWIND_TRACE_API("_Unwind_GetLanguageSpecificData(context=%p)"
"=> 0x%lX\n", context, result);
if (result != 0) {
if (*((uint8_t *)result) != 0xFF)
_LIBUNWIND_DEBUG_LOG("lsda at 0x%lX does not start with 0xFF\n", result);
}
return result;
}
/// Called by personality handler during phase 2 to get register values.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetGR(struct _Unwind_Context *context,
int index) {
unw_cursor_t *cursor = (unw_cursor_t *)context;
unw_word_t result;
unw_get_reg(cursor, index, &result);
_LIBUNWIND_TRACE_API("_Unwind_GetGR(context=%p, reg=%d) => 0x%llX\n",
context,
index, (uint64_t) result);
return (uintptr_t)result;
}
/// Called by personality handler during phase 2 to alter register values.
_LIBUNWIND_EXPORT void _Unwind_SetGR(struct _Unwind_Context *context, int index,
uintptr_t new_value) {
_LIBUNWIND_TRACE_API("_Unwind_SetGR(context=%p, reg=%d, "
"value=0x%0llX)\n", context,
index, (uint64_t) new_value);
unw_cursor_t *cursor = (unw_cursor_t *)context;
unw_set_reg(cursor, index, new_value);
}
/// Called by personality handler during phase 2 to get instruction pointer.
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
unw_cursor_t *cursor = (unw_cursor_t *)context;
unw_word_t result;
unw_get_reg(cursor, UNW_REG_IP, &result);
_LIBUNWIND_TRACE_API("_Unwind_GetIP(context=%p) => 0x%llX\n", context,
(uint64_t) result);
return (uintptr_t)result;
}
/// Called by personality handler during phase 2 to alter instruction pointer,
/// such as setting where the landing pad is, so _Unwind_Resume() will
/// start executing in the landing pad.
_LIBUNWIND_EXPORT void _Unwind_SetIP(struct _Unwind_Context *context,
uintptr_t new_value) {
_LIBUNWIND_TRACE_API("_Unwind_SetIP(context=%p, value=0x%0llX)\n",
context, (uint64_t) new_value);
unw_cursor_t *cursor = (unw_cursor_t *)context;
unw_set_reg(cursor, UNW_REG_IP, new_value);
}
/// Called by personality handler during phase 2 to find the start of the
/// function.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetRegionStart(struct _Unwind_Context *context) {
unw_cursor_t *cursor = (unw_cursor_t *)context;
unw_proc_info_t frameInfo;
uintptr_t result = 0;
if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
result = (uintptr_t)frameInfo.start_ip;
_LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p) => 0x%lX\n",
context, result);
return result;
}
/// Called by personality handler during phase 2 if a foreign exception
// is caught.
_LIBUNWIND_EXPORT void
_Unwind_DeleteException(struct _Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_DeleteException(ex_obj=%p)\n",
exception_object);
if (exception_object->exception_cleanup != NULL)
(*exception_object->exception_cleanup)(_URC_FOREIGN_EXCEPTION_CAUGHT,
exception_object);
}
#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS

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//===-------------------- UnwindRegistersRestore.s ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
.text
#if __i386__
#
# extern int unw_getcontext(unw_context_t* thread_state)
#
# On entry:
# + +
# +-----------------------+
# + thread_state pointer +
# +-----------------------+
# + return address +
# +-----------------------+ <-- SP
# + +
#
.globl _unw_getcontext
_unw_getcontext:
push %eax
movl 8(%esp), %eax
movl %ebx, 4(%eax)
movl %ecx, 8(%eax)
movl %edx, 12(%eax)
movl %edi, 16(%eax)
movl %esi, 20(%eax)
movl %ebp, 24(%eax)
movl %esp, %edx
addl $8, %edx
movl %edx, 28(%eax) # store what sp was at call site as esp
# skip ss
# skip eflags
movl 4(%esp), %edx
movl %edx, 40(%eax) # store return address as eip
# skip cs
# skip ds
# skip es
# skip fs
# skip gs
movl (%esp), %edx
movl %edx, (%eax) # store original eax
popl %eax
xorl %eax, %eax # return UNW_ESUCCESS
ret
#elif __x86_64__
#
# extern int unw_getcontext(unw_context_t* thread_state)
#
# On entry:
# thread_state pointer is in rdi
#
.globl _unw_getcontext
_unw_getcontext:
movq %rax, (%rdi)
movq %rbx, 8(%rdi)
movq %rcx, 16(%rdi)
movq %rdx, 24(%rdi)
movq %rdi, 32(%rdi)
movq %rsi, 40(%rdi)
movq %rbp, 48(%rdi)
movq %rsp, 56(%rdi)
addq $8, 56(%rdi)
movq %r8, 64(%rdi)
movq %r9, 72(%rdi)
movq %r10, 80(%rdi)
movq %r11, 88(%rdi)
movq %r12, 96(%rdi)
movq %r13,104(%rdi)
movq %r14,112(%rdi)
movq %r15,120(%rdi)
movq (%rsp),%rsi
movq %rsi,128(%rdi) # store return address as rip
# skip rflags
# skip cs
# skip fs
# skip gs
xorl %eax, %eax # return UNW_ESUCCESS
ret
#elif __ppc__
;
; extern int unw_getcontext(unw_context_t* thread_state)
;
; On entry:
; thread_state pointer is in r3
;
.globl _unw_getcontext
_unw_getcontext:
stw r0, 8(r3)
mflr r0
stw r0, 0(r3) ; store lr as ssr0
stw r1, 12(r3)
stw r2, 16(r3)
stw r3, 20(r3)
stw r4, 24(r3)
stw r5, 28(r3)
stw r6, 32(r3)
stw r7, 36(r3)
stw r8, 40(r3)
stw r9, 44(r3)
stw r10, 48(r3)
stw r11, 52(r3)
stw r12, 56(r3)
stw r13, 60(r3)
stw r14, 64(r3)
stw r15, 68(r3)
stw r16, 72(r3)
stw r17, 76(r3)
stw r18, 80(r3)
stw r19, 84(r3)
stw r20, 88(r3)
stw r21, 92(r3)
stw r22, 96(r3)
stw r23,100(r3)
stw r24,104(r3)
stw r25,108(r3)
stw r26,112(r3)
stw r27,116(r3)
stw r28,120(r3)
stw r29,124(r3)
stw r30,128(r3)
stw r31,132(r3)
; save VRSave register
mfspr r0,256
stw r0,156(r3)
; save CR registers
mfcr r0
stw r0,136(r3)
; save CTR register
mfctr r0
stw r0,148(r3)
; save float registers
stfd f0, 160(r3)
stfd f1, 168(r3)
stfd f2, 176(r3)
stfd f3, 184(r3)
stfd f4, 192(r3)
stfd f5, 200(r3)
stfd f6, 208(r3)
stfd f7, 216(r3)
stfd f8, 224(r3)
stfd f9, 232(r3)
stfd f10,240(r3)
stfd f11,248(r3)
stfd f12,256(r3)
stfd f13,264(r3)
stfd f14,272(r3)
stfd f15,280(r3)
stfd f16,288(r3)
stfd f17,296(r3)
stfd f18,304(r3)
stfd f19,312(r3)
stfd f20,320(r3)
stfd f21,328(r3)
stfd f22,336(r3)
stfd f23,344(r3)
stfd f24,352(r3)
stfd f25,360(r3)
stfd f26,368(r3)
stfd f27,376(r3)
stfd f28,384(r3)
stfd f29,392(r3)
stfd f30,400(r3)
stfd f31,408(r3)
; save vector registers
subi r4,r1,16
rlwinm r4,r4,0,0,27 ; mask low 4-bits
; r4 is now a 16-byte aligned pointer into the red zone
#define SAVE_VECTOR_UNALIGNED(_vec, _offset) \
stvx _vec,0,r4 @\
lwz r5, 0(r4) @\
stw r5, _offset(r3) @\
lwz r5, 4(r4) @\
stw r5, _offset+4(r3) @\
lwz r5, 8(r4) @\
stw r5, _offset+8(r3) @\
lwz r5, 12(r4) @\
stw r5, _offset+12(r3)
SAVE_VECTOR_UNALIGNED( v0, 424+0x000)
SAVE_VECTOR_UNALIGNED( v1, 424+0x010)
SAVE_VECTOR_UNALIGNED( v2, 424+0x020)
SAVE_VECTOR_UNALIGNED( v3, 424+0x030)
SAVE_VECTOR_UNALIGNED( v4, 424+0x040)
SAVE_VECTOR_UNALIGNED( v5, 424+0x050)
SAVE_VECTOR_UNALIGNED( v6, 424+0x060)
SAVE_VECTOR_UNALIGNED( v7, 424+0x070)
SAVE_VECTOR_UNALIGNED( v8, 424+0x080)
SAVE_VECTOR_UNALIGNED( v9, 424+0x090)
SAVE_VECTOR_UNALIGNED(v10, 424+0x0A0)
SAVE_VECTOR_UNALIGNED(v11, 424+0x0B0)
SAVE_VECTOR_UNALIGNED(v12, 424+0x0C0)
SAVE_VECTOR_UNALIGNED(v13, 424+0x0D0)
SAVE_VECTOR_UNALIGNED(v14, 424+0x0E0)
SAVE_VECTOR_UNALIGNED(v15, 424+0x0F0)
SAVE_VECTOR_UNALIGNED(v16, 424+0x100)
SAVE_VECTOR_UNALIGNED(v17, 424+0x110)
SAVE_VECTOR_UNALIGNED(v18, 424+0x120)
SAVE_VECTOR_UNALIGNED(v19, 424+0x130)
SAVE_VECTOR_UNALIGNED(v20, 424+0x140)
SAVE_VECTOR_UNALIGNED(v21, 424+0x150)
SAVE_VECTOR_UNALIGNED(v22, 424+0x160)
SAVE_VECTOR_UNALIGNED(v23, 424+0x170)
SAVE_VECTOR_UNALIGNED(v24, 424+0x180)
SAVE_VECTOR_UNALIGNED(v25, 424+0x190)
SAVE_VECTOR_UNALIGNED(v26, 424+0x1A0)
SAVE_VECTOR_UNALIGNED(v27, 424+0x1B0)
SAVE_VECTOR_UNALIGNED(v28, 424+0x1C0)
SAVE_VECTOR_UNALIGNED(v29, 424+0x1D0)
SAVE_VECTOR_UNALIGNED(v30, 424+0x1E0)
SAVE_VECTOR_UNALIGNED(v31, 424+0x1F0)
li r3, 0 ; return UNW_ESUCCESS
blr
#elif __arm64__
;
; extern int unw_getcontext(unw_context_t* thread_state)
;
; On entry:
; thread_state pointer is in x0
;
.globl _unw_getcontext
_unw_getcontext:
stp x0, x1, [x0, #0x000]
stp x2, x3, [x0, #0x010]
stp x4, x5, [x0, #0x020]
stp x6, x7, [x0, #0x030]
stp x8, x9, [x0, #0x040]
stp x10,x11, [x0, #0x050]
stp x12,x13, [x0, #0x060]
stp x14,x15, [x0, #0x070]
stp x16,x17, [x0, #0x080]
stp x18,x19, [x0, #0x090]
stp x20,x21, [x0, #0x0A0]
stp x22,x23, [x0, #0x0B0]
stp x24,x25, [x0, #0x0C0]
stp x26,x27, [x0, #0x0D0]
stp x28,fp, [x0, #0x0E0]
str lr, [x0, #0x0F0]
mov x1,sp
str x1, [x0, #0x0F8]
str lr, [x0, #0x100] ; store return address as pc
; skip cpsr
stp d0, d1, [x0, #0x110]
stp d2, d3, [x0, #0x120]
stp d4, d5, [x0, #0x130]
stp d6, d7, [x0, #0x140]
stp d8, d9, [x0, #0x150]
stp d10,d11, [x0, #0x160]
stp d12,d13, [x0, #0x170]
stp d14,d15, [x0, #0x180]
stp d16,d17, [x0, #0x190]
stp d18,d19, [x0, #0x1A0]
stp d20,d21, [x0, #0x1B0]
stp d22,d23, [x0, #0x1C0]
stp d24,d25, [x0, #0x1D0]
stp d26,d27, [x0, #0x1E0]
stp d28,d29, [x0, #0x1F0]
str d30, [x0, #0x200]
str d31, [x0, #0x208]
ldr x0, #0 ; return UNW_ESUCCESS
ret
#endif

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libcxxabi/src/Unwind/UnwindRegistersSave.s Normal file
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//===------------------------ UnwindRegistersSave.s -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#if __i386__
.text
.globl __ZN9libunwind13Registers_x866jumptoEv
.private_extern __ZN9libunwind13Registers_x866jumptoEv
__ZN9libunwind13Registers_x866jumptoEv:
#
# void libunwind::Registers_x86::jumpto()
#
# On entry:
# + +
# +-----------------------+
# + thread_state pointer +
# +-----------------------+
# + return address +
# +-----------------------+ <-- SP
# + +
movl 4(%esp), %eax
# set up eax and ret on new stack location
movl 28(%eax), %edx # edx holds new stack pointer
subl $8,%edx
movl %edx, 28(%eax)
movl 0(%eax), %ebx
movl %ebx, 0(%edx)
movl 40(%eax), %ebx
movl %ebx, 4(%edx)
# we now have ret and eax pushed onto where new stack will be
# restore all registers
movl 4(%eax), %ebx
movl 8(%eax), %ecx
movl 12(%eax), %edx
movl 16(%eax), %edi
movl 20(%eax), %esi
movl 24(%eax), %ebp
movl 28(%eax), %esp
# skip ss
# skip eflags
pop %eax # eax was already pushed on new stack
ret # eip was already pushed on new stack
# skip cs
# skip ds
# skip es
# skip fs
# skip gs
#elif __x86_64__
.text
.globl __ZN9libunwind16Registers_x86_646jumptoEv
.private_extern __ZN9libunwind16Registers_x86_646jumptoEv
__ZN9libunwind16Registers_x86_646jumptoEv:
#
# void libunwind::Registers_x86_64::jumpto()
#
# On entry, thread_state pointer is in rdi
movq 56(%rdi), %rax # rax holds new stack pointer
subq $16, %rax
movq %rax, 56(%rdi)
movq 32(%rdi), %rbx # store new rdi on new stack
movq %rbx, 0(%rax)
movq 128(%rdi), %rbx # store new rip on new stack
movq %rbx, 8(%rax)
# restore all registers
movq 0(%rdi), %rax
movq 8(%rdi), %rbx
movq 16(%rdi), %rcx
movq 24(%rdi), %rdx
# restore rdi later
movq 40(%rdi), %rsi
movq 48(%rdi), %rbp
# restore rsp later
movq 64(%rdi), %r8
movq 72(%rdi), %r9
movq 80(%rdi), %r10
movq 88(%rdi), %r11
movq 96(%rdi), %r12
movq 104(%rdi), %r13
movq 112(%rdi), %r14
movq 120(%rdi), %r15
# skip rflags
# skip cs
# skip fs
# skip gs
movq 56(%rdi), %rsp # cut back rsp to new location
pop %rdi # rdi was saved here earlier
ret # rip was saved here
#elif __ppc__
.text
.globl __ZN9libunwind13Registers_ppc6jumptoEv
.private_extern __ZN9libunwind13Registers_ppc6jumptoEv
__ZN9libunwind13Registers_ppc6jumptoEv:
;
; void libunwind::Registers_ppc::jumpto()
;
; On entry:
; thread_state pointer is in r3
;
; restore integral registerrs
; skip r0 for now
; skip r1 for now
lwz r2, 16(r3)
; skip r3 for now
; skip r4 for now
; skip r5 for now
lwz r6, 32(r3)
lwz r7, 36(r3)
lwz r8, 40(r3)
lwz r9, 44(r3)
lwz r10, 48(r3)
lwz r11, 52(r3)
lwz r12, 56(r3)
lwz r13, 60(r3)
lwz r14, 64(r3)
lwz r15, 68(r3)
lwz r16, 72(r3)
lwz r17, 76(r3)
lwz r18, 80(r3)
lwz r19, 84(r3)
lwz r20, 88(r3)
lwz r21, 92(r3)
lwz r22, 96(r3)
lwz r23,100(r3)
lwz r24,104(r3)
lwz r25,108(r3)
lwz r26,112(r3)
lwz r27,116(r3)
lwz r28,120(r3)
lwz r29,124(r3)
lwz r30,128(r3)
lwz r31,132(r3)
; restore float registers
lfd f0, 160(r3)
lfd f1, 168(r3)
lfd f2, 176(r3)
lfd f3, 184(r3)
lfd f4, 192(r3)
lfd f5, 200(r3)
lfd f6, 208(r3)
lfd f7, 216(r3)
lfd f8, 224(r3)
lfd f9, 232(r3)
lfd f10,240(r3)
lfd f11,248(r3)
lfd f12,256(r3)
lfd f13,264(r3)
lfd f14,272(r3)
lfd f15,280(r3)
lfd f16,288(r3)
lfd f17,296(r3)
lfd f18,304(r3)
lfd f19,312(r3)
lfd f20,320(r3)
lfd f21,328(r3)
lfd f22,336(r3)
lfd f23,344(r3)
lfd f24,352(r3)
lfd f25,360(r3)
lfd f26,368(r3)
lfd f27,376(r3)
lfd f28,384(r3)
lfd f29,392(r3)
lfd f30,400(r3)
lfd f31,408(r3)
; restore vector registers if any are in use
lwz r5,156(r3) ; test VRsave
cmpwi r5,0
beq Lnovec
subi r4,r1,16
rlwinm r4,r4,0,0,27 ; mask low 4-bits
; r4 is now a 16-byte aligned pointer into the red zone
; the _vectorRegisters may not be 16-byte aligned so copy via red zone temp buffer
#define LOAD_VECTOR_UNALIGNEDl(_index) \
andis. r0,r5,(1<<(15-_index)) @\
beq Ldone ## _index @\
lwz r0, 424+_index*16(r3) @\
stw r0, 0(r4) @\
lwz r0, 424+_index*16+4(r3) @\
stw r0, 4(r4) @\
lwz r0, 424+_index*16+8(r3) @\
stw r0, 8(r4) @\
lwz r0, 424+_index*16+12(r3)@\
stw r0, 12(r4) @\
lvx v ## _index,0,r4 @\
Ldone ## _index:
#define LOAD_VECTOR_UNALIGNEDh(_index) \
andi. r0,r5,(1<<(31-_index)) @\
beq Ldone ## _index @\
lwz r0, 424+_index*16(r3) @\
stw r0, 0(r4) @\
lwz r0, 424+_index*16+4(r3) @\
stw r0, 4(r4) @\
lwz r0, 424+_index*16+8(r3) @\
stw r0, 8(r4) @\
lwz r0, 424+_index*16+12(r3)@\
stw r0, 12(r4) @\
lvx v ## _index,0,r4 @\
Ldone ## _index:
LOAD_VECTOR_UNALIGNEDl(0)
LOAD_VECTOR_UNALIGNEDl(1)
LOAD_VECTOR_UNALIGNEDl(2)
LOAD_VECTOR_UNALIGNEDl(3)
LOAD_VECTOR_UNALIGNEDl(4)
LOAD_VECTOR_UNALIGNEDl(5)
LOAD_VECTOR_UNALIGNEDl(6)
LOAD_VECTOR_UNALIGNEDl(7)
LOAD_VECTOR_UNALIGNEDl(8)
LOAD_VECTOR_UNALIGNEDl(9)
LOAD_VECTOR_UNALIGNEDl(10)
LOAD_VECTOR_UNALIGNEDl(11)
LOAD_VECTOR_UNALIGNEDl(12)
LOAD_VECTOR_UNALIGNEDl(13)
LOAD_VECTOR_UNALIGNEDl(14)
LOAD_VECTOR_UNALIGNEDl(15)
LOAD_VECTOR_UNALIGNEDh(16)
LOAD_VECTOR_UNALIGNEDh(17)
LOAD_VECTOR_UNALIGNEDh(18)
LOAD_VECTOR_UNALIGNEDh(19)
LOAD_VECTOR_UNALIGNEDh(20)
LOAD_VECTOR_UNALIGNEDh(21)
LOAD_VECTOR_UNALIGNEDh(22)
LOAD_VECTOR_UNALIGNEDh(23)
LOAD_VECTOR_UNALIGNEDh(24)
LOAD_VECTOR_UNALIGNEDh(25)
LOAD_VECTOR_UNALIGNEDh(26)
LOAD_VECTOR_UNALIGNEDh(27)
LOAD_VECTOR_UNALIGNEDh(28)
LOAD_VECTOR_UNALIGNEDh(29)
LOAD_VECTOR_UNALIGNEDh(30)
LOAD_VECTOR_UNALIGNEDh(31)
Lnovec:
lwz r0, 136(r3) ; __cr
mtocrf 255,r0
lwz r0, 148(r3) ; __ctr
mtctr r0
lwz r0, 0(r3) ; __ssr0
mtctr r0
lwz r0, 8(r3) ; do r0 now
lwz r5,28(r3) ; do r5 now
lwz r4,24(r3) ; do r4 now
lwz r1,12(r3) ; do sp now
lwz r3,20(r3) ; do r3 last
bctr
#elif __arm64__
.text
.globl __ZN9libunwind15Registers_arm646jumptoEv
.private_extern __ZN9libunwind15Registers_arm646jumptoEv
__ZN9libunwind15Registers_arm646jumptoEv:
;
; void libunwind::Registers_arm64::jumpto()
;
; On entry:
; thread_state pointer is in x0
;
; skip restore of x0,x1 for now
ldp x2, x3, [x0, #0x010]
ldp x4, x5, [x0, #0x020]
ldp x6, x7, [x0, #0x030]
ldp x8, x9, [x0, #0x040]
ldp x10,x11, [x0, #0x050]
ldp x12,x13, [x0, #0x060]
ldp x14,x15, [x0, #0x070]
ldp x16,x17, [x0, #0x080]
ldp x18,x19, [x0, #0x090]
ldp x20,x21, [x0, #0x0A0]
ldp x22,x23, [x0, #0x0B0]
ldp x24,x25, [x0, #0x0C0]
ldp x26,x27, [x0, #0x0D0]
ldp x28,fp, [x0, #0x0E0]
ldr lr, [x0, #0x100] ; restore pc into lr
ldr x1, [x0, #0x0F8]
mov sp,x1 ; restore sp
ldp d0, d1, [x0, #0x110]
ldp d2, d3, [x0, #0x120]
ldp d4, d5, [x0, #0x130]
ldp d6, d7, [x0, #0x140]
ldp d8, d9, [x0, #0x150]
ldp d10,d11, [x0, #0x160]
ldp d12,d13, [x0, #0x170]
ldp d14,d15, [x0, #0x180]
ldp d16,d17, [x0, #0x190]
ldp d18,d19, [x0, #0x1A0]
ldp d20,d21, [x0, #0x1B0]
ldp d22,d23, [x0, #0x1C0]
ldp d24,d25, [x0, #0x1D0]
ldp d26,d27, [x0, #0x1E0]
ldp d28,d29, [x0, #0x1F0]
ldr d30, [x0, #0x200]
ldr d31, [x0, #0x208]
ldp x0, x1, [x0, #0x000] ; restore x0,x1
ret lr ; jump to pc
#endif

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//===--------------------- Unwind_AppleExtras.cpp -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
//===----------------------------------------------------------------------===//
#include "config.h"
#include "DwarfParser.hpp"
#include "unwind_ext.h"
// private keymgr stuff
#define KEYMGR_GCC3_DW2_OBJ_LIST 302
extern "C" {
extern void _keymgr_set_and_unlock_processwide_ptr(int key, void *ptr);
extern void *_keymgr_get_and_lock_processwide_ptr(int key);
}
// undocumented libgcc "struct object"
struct libgcc_object {
void *start;
void *unused1;
void *unused2;
void *fde;
unsigned long encoding;
void *fde_end;
libgcc_object *next;
};
// undocumented libgcc "struct km_object_info" referenced by
// KEYMGR_GCC3_DW2_OBJ_LIST
struct libgcc_object_info {
libgcc_object *seen_objects;
libgcc_object *unseen_objects;
unsigned spare[2];
};
// static linker symbols to prevent wrong two level namespace for _Unwind symbols
#if __arm__
#define NOT_HERE_BEFORE_5_0(sym) \
extern const char sym##_tmp30 __asm("$ld$hide$os3.0$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp30 = 0; \
extern const char sym##_tmp31 __asm("$ld$hide$os3.1$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp31 = 0; \
extern const char sym##_tmp32 __asm("$ld$hide$os3.2$_" #sym );\
__attribute__((visibility("default"))) const char sym##_tmp32 = 0; \
extern const char sym##_tmp40 __asm("$ld$hide$os4.0$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp40 = 0; \
extern const char sym##_tmp41 __asm("$ld$hide$os4.1$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp41 = 0; \
extern const char sym##_tmp42 __asm("$ld$hide$os4.2$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp42 = 0; \
extern const char sym##_tmp43 __asm("$ld$hide$os4.3$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp43 = 0;
#elif __arm64__
#define NOT_HERE_BEFORE_10_6(sym)
#define NEVER_HERE(sym)
#else
#define NOT_HERE_BEFORE_10_6(sym) \
extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp5 = 0;
#define NEVER_HERE(sym) \
extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp5 = 0; \
extern const char sym##_tmp6 __asm("$ld$hide$os10.6$_" #sym ); \
__attribute__((visibility("default"))) const char sym##_tmp6 = 0;
#endif
#if _LIBUNWIND_BUILD_ZERO_COST_APIS
//
// symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in
// earlier versions
//
NOT_HERE_BEFORE_10_6(_Unwind_DeleteException)
NOT_HERE_BEFORE_10_6(_Unwind_Find_FDE)
NOT_HERE_BEFORE_10_6(_Unwind_ForcedUnwind)
NOT_HERE_BEFORE_10_6(_Unwind_GetGR)
NOT_HERE_BEFORE_10_6(_Unwind_GetIP)
NOT_HERE_BEFORE_10_6(_Unwind_GetLanguageSpecificData)
NOT_HERE_BEFORE_10_6(_Unwind_GetRegionStart)
NOT_HERE_BEFORE_10_6(_Unwind_RaiseException)
NOT_HERE_BEFORE_10_6(_Unwind_Resume)
NOT_HERE_BEFORE_10_6(_Unwind_SetGR)
NOT_HERE_BEFORE_10_6(_Unwind_SetIP)
NOT_HERE_BEFORE_10_6(_Unwind_Backtrace)
NOT_HERE_BEFORE_10_6(_Unwind_FindEnclosingFunction)
NOT_HERE_BEFORE_10_6(_Unwind_GetCFA)
NOT_HERE_BEFORE_10_6(_Unwind_GetDataRelBase)
NOT_HERE_BEFORE_10_6(_Unwind_GetTextRelBase)
NOT_HERE_BEFORE_10_6(_Unwind_Resume_or_Rethrow)
NOT_HERE_BEFORE_10_6(_Unwind_GetIPInfo)
NOT_HERE_BEFORE_10_6(__register_frame)
NOT_HERE_BEFORE_10_6(__deregister_frame)
//
// symbols in libSystem.dylib for compatibility, but we don't want any new code
// using them
//
NEVER_HERE(__register_frame_info_bases)
NEVER_HERE(__register_frame_info)
NEVER_HERE(__register_frame_info_table_bases)
NEVER_HERE(__register_frame_info_table)
NEVER_HERE(__register_frame_table)
NEVER_HERE(__deregister_frame_info)
NEVER_HERE(__deregister_frame_info_bases)
#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS
#if _LIBUNWIND_BUILD_SJLJ_APIS
//
// symbols in libSystem.dylib in iOS 5.0 and later, but are in libgcc_s.dylib in
// earlier versions
//
NOT_HERE_BEFORE_5_0(_Unwind_GetLanguageSpecificData)
NOT_HERE_BEFORE_5_0(_Unwind_GetRegionStart)
NOT_HERE_BEFORE_5_0(_Unwind_GetIP)
NOT_HERE_BEFORE_5_0(_Unwind_SetGR)
NOT_HERE_BEFORE_5_0(_Unwind_SetIP)
NOT_HERE_BEFORE_5_0(_Unwind_DeleteException)
NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Register)
NOT_HERE_BEFORE_5_0(_Unwind_GetGR)
NOT_HERE_BEFORE_5_0(_Unwind_GetIPInfo)
NOT_HERE_BEFORE_5_0(_Unwind_GetCFA)
NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume)
NOT_HERE_BEFORE_5_0(_Unwind_SjLj_RaiseException)
NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume_or_Rethrow)
NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Unregister)
#endif // _LIBUNWIND_BUILD_SJLJ_APIS
namespace libunwind {
_LIBUNWIND_HIDDEN
bool checkKeyMgrRegisteredFDEs(uintptr_t pc, void *&fde) {
#if __MAC_OS_X_VERSION_MIN_REQUIRED
// lastly check for old style keymgr registration of dynamically generated
// FDEs acquire exclusive access to libgcc_object_info
libgcc_object_info *head = (libgcc_object_info *)
_keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
if (head != NULL) {
// look at each FDE in keymgr
for (libgcc_object *ob = head->unseen_objects; ob != NULL; ob = ob->next) {
CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
const char *msg = CFI_Parser<LocalAddressSpace>::decodeFDE(
LocalAddressSpace::sThisAddressSpace,
(uintptr_t)ob->fde, &fdeInfo, &cieInfo);
if (msg == NULL) {
// Check if this FDE is for a function that includes the pc
if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) {
fde = (void*)fdeInfo.pcStart;
_keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
head);
return true;
}
}
}
}
// release libgcc_object_info
_keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, head);
#else
(void)pc;
(void)fde;
#endif
return false;
}
}
#if !FOR_DYLD
#include <System/pthread_machdep.h>
_LIBUNWIND_HIDDEN
struct _Unwind_FunctionContext *__Unwind_SjLj_GetTopOfFunctionStack() {
return (struct _Unwind_FunctionContext *)
_pthread_getspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key);
}
_LIBUNWIND_HIDDEN
void __Unwind_SjLj_SetTopOfFunctionStack(struct _Unwind_FunctionContext *fc) {
_pthread_setspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key, fc);
}
#endif

108
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//===----------------------------- config.h -------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Defines macros used within libuwind project.
//
//===----------------------------------------------------------------------===//
#ifndef LIBUNWIND_CONFIG_H
#define LIBUNWIND_CONFIG_H
#include <assert.h>
// Define static_assert() unless already defined by compiler.
#ifndef __has_feature
#define __has_feature(__x) 0
#endif
#if !(__has_feature(cxx_static_assert))
#define static_assert(__b, __m) \
extern int compile_time_assert_failed[ ( __b ) ? 1 : -1 ] \
__attribute__( ( unused ) );
#endif
// Platform specific configuration defines.
#if __APPLE__
#include <Availability.h>
#ifdef __cplusplus
extern "C" {
#endif
void __assert_rtn(const char *, const char *, int, const char *)
__attribute__((noreturn));
#ifdef __cplusplus
}
#endif
#define _LIBUNWIND_BUILD_ZERO_COST_APIS (__i386__ || __x86_64__ || __arm64__)
#define _LIBUNWIND_BUILD_SJLJ_APIS (__arm__)
#define _LIBUNWIND_SUPPORT_FRAME_APIS (__i386__ || __x86_64__)
#define _LIBUNWIND_EXPORT __attribute__((visibility("default")))
#define _LIBUNWIND_HIDDEN __attribute__((visibility("hidden")))
#define _LIBUNWIND_LOG(msg, ...) fprintf(stderr, "libuwind: " msg, __VA_ARGS__)
#define _LIBUNWIND_ABORT(msg) __assert_rtn(__func__, __FILE__, __LINE__, msg)
#if FOR_DYLD
#define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1
#define _LIBUNWIND_SUPPORT_DWARF_UNWIND 0
#define _LIBUNWIND_SUPPORT_DWARF_INDEX 0
#else
#define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1
#define _LIBUNWIND_SUPPORT_DWARF_UNWIND 1
#define _LIBUNWIND_SUPPORT_DWARF_INDEX 0
#endif
#else
// #define _LIBUNWIND_BUILD_ZERO_COST_APIS
// #define _LIBUNWIND_BUILD_SJLJ_APIS
// #define _LIBUNWIND_SUPPORT_FRAME_APIS
// #define _LIBUNWIND_EXPORT
// #define _LIBUNWIND_HIDDEN
// #define _LIBUNWIND_LOG()
// #define _LIBUNWIND_ABORT()
// #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND
// #define _LIBUNWIND_SUPPORT_DWARF_UNWIND
// #define _LIBUNWIND_SUPPORT_DWARF_INDEX
#endif
// Macros that define away in non-Debug builds
#ifdef NDEBUG
#define _LIBUNWIND_DEBUG_LOG(msg, ...)
#define _LIBUNWIND_TRACE_API(msg, ...)
#define _LIBUNWIND_TRACING_UNWINDING 0
#define _LIBUNWIND_TRACE_UNWINDING(msg, ...)
#define _LIBUNWIND_LOG_NON_ZERO(x) x
#else
#ifdef __cplusplus
extern "C" {
#endif
extern bool logAPIs();
extern bool logUnwinding();
#ifdef __cplusplus
}
#endif
#define _LIBUNWIND_DEBUG_LOG(msg, ...) _LIBUNWIND_LOG(msg, __VA_ARGS__)
#define _LIBUNWIND_LOG_NON_ZERO(x) \
do { \
int _err = x; \
if ( _err != 0 ) \
_LIBUNWIND_LOG("" #x "=%d in %s", _err, __FUNCTION__); \
} while (0)
#define _LIBUNWIND_TRACE_API(msg, ...) \
do { \
if ( logAPIs() ) _LIBUNWIND_LOG(msg, __VA_ARGS__); \
} while(0)
#define _LIBUNWIND_TRACE_UNWINDING(msg, ...) \
do { \
if ( logUnwinding() ) _LIBUNWIND_LOG(msg, __VA_ARGS__); \
} while(0)
#define _LIBUNWIND_TRACING_UNWINDING logUnwinding()
#endif
#endif // LIBUNWIND_CONFIG_H

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libcxxabi/src/Unwind/dwarf2.h Normal file
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//===------------------------------- dwarf2.h -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/*
These constants were taken from version 3 of the DWARF standard,
which is Copyright (c) 2005 Free Standards Group, and
Copyright (c) 1992, 1993 UNIX International, Inc.
*/
#ifndef __DWARF2__
#define __DWARF2__
// dwarf unwind instructions
enum {
DW_CFA_nop = 0x0,
DW_CFA_set_loc = 0x1,
DW_CFA_advance_loc1 = 0x2,
DW_CFA_advance_loc2 = 0x3,
DW_CFA_advance_loc4 = 0x4,
DW_CFA_offset_extended = 0x5,
DW_CFA_restore_extended = 0x6,
DW_CFA_undefined = 0x7,
DW_CFA_same_value = 0x8,
DW_CFA_register = 0x9,
DW_CFA_remember_state = 0xA,
DW_CFA_restore_state = 0xB,
DW_CFA_def_cfa = 0xC,
DW_CFA_def_cfa_register = 0xD,
DW_CFA_def_cfa_offset = 0xE,
DW_CFA_def_cfa_expression = 0xF,
DW_CFA_expression = 0x10,
DW_CFA_offset_extended_sf = 0x11,
DW_CFA_def_cfa_sf = 0x12,
DW_CFA_def_cfa_offset_sf = 0x13,
DW_CFA_val_offset = 0x14,
DW_CFA_val_offset_sf = 0x15,
DW_CFA_val_expression = 0x16,
DW_CFA_advance_loc = 0x40, // high 2 bits are 0x1, lower 6 bits are delta
DW_CFA_offset = 0x80, // high 2 bits are 0x2, lower 6 bits are register
DW_CFA_restore = 0xC0, // high 2 bits are 0x3, lower 6 bits are register
// GNU extensions
DW_CFA_GNU_window_save = 0x2D,
DW_CFA_GNU_args_size = 0x2E,
DW_CFA_GNU_negative_offset_extended = 0x2F
};
// FSF exception handling Pointer-Encoding constants
// Used in CFI augmentation by gcc compiler
enum {
DW_EH_PE_ptr = 0x00,
DW_EH_PE_uleb128 = 0x01,
DW_EH_PE_udata2 = 0x02,
DW_EH_PE_udata4 = 0x03,
DW_EH_PE_udata8 = 0x04,
DW_EH_PE_signed = 0x08,
DW_EH_PE_sleb128 = 0x09,
DW_EH_PE_sdata2 = 0x0A,
DW_EH_PE_sdata4 = 0x0B,
DW_EH_PE_sdata8 = 0x0C,
DW_EH_PE_absptr = 0x00,
DW_EH_PE_pcrel = 0x10,
DW_EH_PE_textrel = 0x20,
DW_EH_PE_datarel = 0x30,
DW_EH_PE_funcrel = 0x40,
DW_EH_PE_aligned = 0x50,
DW_EH_PE_indirect = 0x80,
DW_EH_PE_omit = 0xFF
};
// DWARF expressions
enum {
DW_OP_addr = 0x03, // constant address (size target specific)
DW_OP_deref = 0x06,
DW_OP_const1u = 0x08, // 1-byte constant
DW_OP_const1s = 0x09, // 1-byte constant
DW_OP_const2u = 0x0A, // 2-byte constant
DW_OP_const2s = 0x0B, // 2-byte constant
DW_OP_const4u = 0x0C, // 4-byte constant
DW_OP_const4s = 0x0D, // 4-byte constant
DW_OP_const8u = 0x0E, // 8-byte constant
DW_OP_const8s = 0x0F, // 8-byte constant
DW_OP_constu = 0x10, // ULEB128 constant
DW_OP_consts = 0x11, // SLEB128 constant
DW_OP_dup = 0x12,
DW_OP_drop = 0x13,
DW_OP_over = 0x14,
DW_OP_pick = 0x15, // 1-byte stack index
DW_OP_swap = 0x16,
DW_OP_rot = 0x17,
DW_OP_xderef = 0x18,
DW_OP_abs = 0x19,
DW_OP_and = 0x1A,
DW_OP_div = 0x1B,
DW_OP_minus = 0x1C,
DW_OP_mod = 0x1D,
DW_OP_mul = 0x1E,
DW_OP_neg = 0x1F,
DW_OP_not = 0x20,
DW_OP_or = 0x21,
DW_OP_plus = 0x22,
DW_OP_plus_uconst = 0x23, // ULEB128 addend
DW_OP_shl = 0x24,
DW_OP_shr = 0x25,
DW_OP_shra = 0x26,
DW_OP_xor = 0x27,
DW_OP_skip = 0x2F, // signed 2-byte constant
DW_OP_bra = 0x28, // signed 2-byte constant
DW_OP_eq = 0x29,
DW_OP_ge = 0x2A,
DW_OP_gt = 0x2B,
DW_OP_le = 0x2C,
DW_OP_lt = 0x2D,
DW_OP_ne = 0x2E,
DW_OP_lit0 = 0x30, // Literal 0
DW_OP_lit1 = 0x31, // Literal 1
DW_OP_lit2 = 0x32, // Literal 2
DW_OP_lit3 = 0x33, // Literal 3
DW_OP_lit4 = 0x34, // Literal 4
DW_OP_lit5 = 0x35, // Literal 5
DW_OP_lit6 = 0x36, // Literal 6
DW_OP_lit7 = 0x37, // Literal 7
DW_OP_lit8 = 0x38, // Literal 8
DW_OP_lit9 = 0x39, // Literal 9
DW_OP_lit10 = 0x3A, // Literal 10
DW_OP_lit11 = 0x3B, // Literal 11
DW_OP_lit12 = 0x3C, // Literal 12
DW_OP_lit13 = 0x3D, // Literal 13
DW_OP_lit14 = 0x3E, // Literal 14
DW_OP_lit15 = 0x3F, // Literal 15
DW_OP_lit16 = 0x40, // Literal 16
DW_OP_lit17 = 0x41, // Literal 17
DW_OP_lit18 = 0x42, // Literal 18
DW_OP_lit19 = 0x43, // Literal 19
DW_OP_lit20 = 0x44, // Literal 20
DW_OP_lit21 = 0x45, // Literal 21
DW_OP_lit22 = 0x46, // Literal 22
DW_OP_lit23 = 0x47, // Literal 23
DW_OP_lit24 = 0x48, // Literal 24
DW_OP_lit25 = 0x49, // Literal 25
DW_OP_lit26 = 0x4A, // Literal 26
DW_OP_lit27 = 0x4B, // Literal 27
DW_OP_lit28 = 0x4C, // Literal 28
DW_OP_lit29 = 0x4D, // Literal 29
DW_OP_lit30 = 0x4E, // Literal 30
DW_OP_lit31 = 0x4F, // Literal 31
DW_OP_reg0 = 0x50, // Contents of reg0
DW_OP_reg1 = 0x51, // Contents of reg1
DW_OP_reg2 = 0x52, // Contents of reg2
DW_OP_reg3 = 0x53, // Contents of reg3
DW_OP_reg4 = 0x54, // Contents of reg4
DW_OP_reg5 = 0x55, // Contents of reg5
DW_OP_reg6 = 0x56, // Contents of reg6
DW_OP_reg7 = 0x57, // Contents of reg7
DW_OP_reg8 = 0x58, // Contents of reg8
DW_OP_reg9 = 0x59, // Contents of reg9
DW_OP_reg10 = 0x5A, // Contents of reg10
DW_OP_reg11 = 0x5B, // Contents of reg11
DW_OP_reg12 = 0x5C, // Contents of reg12
DW_OP_reg13 = 0x5D, // Contents of reg13
DW_OP_reg14 = 0x5E, // Contents of reg14
DW_OP_reg15 = 0x5F, // Contents of reg15
DW_OP_reg16 = 0x60, // Contents of reg16
DW_OP_reg17 = 0x61, // Contents of reg17
DW_OP_reg18 = 0x62, // Contents of reg18
DW_OP_reg19 = 0x63, // Contents of reg19
DW_OP_reg20 = 0x64, // Contents of reg20
DW_OP_reg21 = 0x65, // Contents of reg21
DW_OP_reg22 = 0x66, // Contents of reg22
DW_OP_reg23 = 0x67, // Contents of reg23
DW_OP_reg24 = 0x68, // Contents of reg24
DW_OP_reg25 = 0x69, // Contents of reg25
DW_OP_reg26 = 0x6A, // Contents of reg26
DW_OP_reg27 = 0x6B, // Contents of reg27
DW_OP_reg28 = 0x6C, // Contents of reg28
DW_OP_reg29 = 0x6D, // Contents of reg29
DW_OP_reg30 = 0x6E, // Contents of reg30
DW_OP_reg31 = 0x6F, // Contents of reg31
DW_OP_breg0 = 0x70, // base register 0 + SLEB128 offset
DW_OP_breg1 = 0x71, // base register 1 + SLEB128 offset
DW_OP_breg2 = 0x72, // base register 2 + SLEB128 offset
DW_OP_breg3 = 0x73, // base register 3 + SLEB128 offset
DW_OP_breg4 = 0x74, // base register 4 + SLEB128 offset
DW_OP_breg5 = 0x75, // base register 5 + SLEB128 offset
DW_OP_breg6 = 0x76, // base register 6 + SLEB128 offset
DW_OP_breg7 = 0x77, // base register 7 + SLEB128 offset
DW_OP_breg8 = 0x78, // base register 8 + SLEB128 offset
DW_OP_breg9 = 0x79, // base register 9 + SLEB128 offset
DW_OP_breg10 = 0x7A, // base register 10 + SLEB128 offset
DW_OP_breg11 = 0x7B, // base register 11 + SLEB128 offset
DW_OP_breg12 = 0x7C, // base register 12 + SLEB128 offset
DW_OP_breg13 = 0x7D, // base register 13 + SLEB128 offset
DW_OP_breg14 = 0x7E, // base register 14 + SLEB128 offset
DW_OP_breg15 = 0x7F, // base register 15 + SLEB128 offset
DW_OP_breg16 = 0x80, // base register 16 + SLEB128 offset
DW_OP_breg17 = 0x81, // base register 17 + SLEB128 offset
DW_OP_breg18 = 0x82, // base register 18 + SLEB128 offset
DW_OP_breg19 = 0x83, // base register 19 + SLEB128 offset
DW_OP_breg20 = 0x84, // base register 20 + SLEB128 offset
DW_OP_breg21 = 0x85, // base register 21 + SLEB128 offset
DW_OP_breg22 = 0x86, // base register 22 + SLEB128 offset
DW_OP_breg23 = 0x87, // base register 23 + SLEB128 offset
DW_OP_breg24 = 0x88, // base register 24 + SLEB128 offset
DW_OP_breg25 = 0x89, // base register 25 + SLEB128 offset
DW_OP_breg26 = 0x8A, // base register 26 + SLEB128 offset
DW_OP_breg27 = 0x8B, // base register 27 + SLEB128 offset
DW_OP_breg28 = 0x8C, // base register 28 + SLEB128 offset
DW_OP_breg29 = 0x8D, // base register 29 + SLEB128 offset
DW_OP_breg30 = 0x8E, // base register 30 + SLEB128 offset
DW_OP_breg31 = 0x8F, // base register 31 + SLEB128 offset
DW_OP_regx = 0x90, // ULEB128 register
DW_OP_fbreg = 0x91, // SLEB128 offset
DW_OP_bregx = 0x92, // ULEB128 register followed by SLEB128 offset
DW_OP_piece = 0x93, // ULEB128 size of piece addressed
DW_OP_deref_size = 0x94, // 1-byte size of data retrieved
DW_OP_xderef_size = 0x95, // 1-byte size of data retrieved
DW_OP_nop = 0x96,
DW_OP_push_object_addres = 0x97,
DW_OP_call2 = 0x98, // 2-byte offset of DIE
DW_OP_call4 = 0x99, // 4-byte offset of DIE
DW_OP_call_ref = 0x9A, // 4- or 8-byte offset of DIE
DW_OP_lo_user = 0xE0,
DW_OP_APPLE_uninit = 0xF0,
DW_OP_hi_user = 0xFF
};
#endif

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//===--------------------------- libuwind.cpp -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Implements unw_* functions from <libunwind.h>
//
//===----------------------------------------------------------------------===//
#include <libunwind.h>
#include <new>
#include "libunwind_ext.h"
#include "config.h"
#if _LIBUNWIND_BUILD_ZERO_COST_APIS
#include "UnwindCursor.hpp"
using namespace libunwind;
/// internal object to represent this processes address space
LocalAddressSpace LocalAddressSpace::sThisAddressSpace;
/// record the registers and stack position of the caller
extern int unw_getcontext(unw_context_t *);
// note: unw_getcontext() implemented in assembly
/// Create a cursor of a thread in this process given 'context' recorded by
/// unw_getcontext().
_LIBUNWIND_EXPORT int unw_init_local(unw_cursor_t *cursor,
unw_context_t *context) {
_LIBUNWIND_TRACE_API("unw_init_local(cursor=%p, context=%p)\n",
cursor, context);
// Use "placement new" to allocate UnwindCursor in the cursor buffer.
#if __i386__
new ((void *)cursor) UnwindCursor<LocalAddressSpace, Registers_x86>(
context, LocalAddressSpace::sThisAddressSpace);
#elif __x86_64__
new ((void *)cursor) UnwindCursor<LocalAddressSpace, Registers_x86_64>(
context, LocalAddressSpace::sThisAddressSpace);
#elif __ppc__
new ((void *)cursor) UnwindCursor<LocalAddressSpace, Registers_ppc>(
context, LocalAddressSpace::sThisAddressSpace);
#elif __arm64__
new ((void *)cursor) UnwindCursor<LocalAddressSpace, Registers_arm64>(
context, LocalAddressSpace::sThisAddressSpace);
#endif
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
co->setInfoBasedOnIPRegister();
return UNW_ESUCCESS;
}
#if UNW_REMOTE
_LIBUNWIND_EXPORT unw_addr_space_t unw_local_addr_space =
(unw_addr_space_t) & sThisAddressSpace;
/// Create a cursor into a thread in another process.
_LIBUNWIND_EXPORT int unw_init_remote_thread(unw_cursor_t *cursor,
unw_addr_space_t as,
thread_t thread) {
// special case: unw_init_remote(xx, unw_local_addr_space, xx)
if (as == (unw_addr_space_t) & sThisAddressSpace)
return unw_init_local(cursor, NULL); //FIXME
// use "placement new" to allocate UnwindCursor in the cursor buffer
switch (as->cpuType) {
case CPU_TYPE_I386:
new ((void *)cursor)
UnwindCursor<OtherAddressSpace<Pointer32<LittleEndian> >,
Registers_x86>(((unw_addr_space_i386 *)as)->oas, thread);
break;
case CPU_TYPE_X86_64:
new ((void *)cursor) UnwindCursor<
OtherAddressSpace<Pointer64<LittleEndian> >, Registers_x86_64>(
((unw_addr_space_x86_64 *)as)->oas, thread);
break;
case CPU_TYPE_POWERPC:
new ((void *)cursor)
UnwindCursor<OtherAddressSpace<Pointer32<BigEndian> >, Registers_ppc>(
((unw_addr_space_ppc *)as)->oas, thread);
break;
default:
return UNW_EUNSPEC;
}
return UNW_ESUCCESS;
}
static bool is64bit(task_t task) {
return false; // FIXME
}
/// Create an address_space object for use in examining another task.
_LIBUNWIND_EXPORT unw_addr_space_t unw_create_addr_space_for_task(task_t task) {
#if __i386__
if (is64bit(task)) {
unw_addr_space_x86_64 *as = new unw_addr_space_x86_64(task);
as->taskPort = task;
as->cpuType = CPU_TYPE_X86_64;
//as->oas
} else {
unw_addr_space_i386 *as = new unw_addr_space_i386(task);
as->taskPort = task;
as->cpuType = CPU_TYPE_I386;
//as->oas
}
#else
// FIXME
#endif
}
/// Delete an address_space object.
_LIBUNWIND_EXPORT void unw_destroy_addr_space(unw_addr_space_t asp) {
switch (asp->cpuType) {
#if __i386__ || __x86_64__
case CPU_TYPE_I386: {
unw_addr_space_i386 *as = (unw_addr_space_i386 *)asp;
delete as;
}
break;
case CPU_TYPE_X86_64: {
unw_addr_space_x86_64 *as = (unw_addr_space_x86_64 *)asp;
delete as;
}
break;
#endif
case CPU_TYPE_POWERPC: {
unw_addr_space_ppc *as = (unw_addr_space_ppc *)asp;
delete as;
}
break;
}
}
#endif // UNW_REMOTE
/// Get value of specified register at cursor position in stack frame.
_LIBUNWIND_EXPORT int unw_get_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
unw_word_t *value) {
_LIBUNWIND_TRACE_API("unw_get_reg(cursor=%p, regNum=%d, &value=%p)\n",
cursor, regNum, value);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
if (co->validReg(regNum)) {
*value = co->getReg(regNum);
return UNW_ESUCCESS;
}
return UNW_EBADREG;
}
/// Set value of specified register at cursor position in stack frame.
_LIBUNWIND_EXPORT int unw_set_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
unw_word_t value) {
_LIBUNWIND_TRACE_API("unw_set_reg(cursor=%p, regNum=%d, value=0x%llX)\n",
cursor, regNum, value);
typedef LocalAddressSpace::pint_t pint_t;
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
if (co->validReg(regNum)) {
co->setReg(regNum, (pint_t)value);
// specical case altering IP to re-find info (being called by personality
// function)
if (regNum == UNW_REG_IP) {
unw_proc_info_t info;
co->getInfo(&info);
pint_t orgArgSize = (pint_t)info.gp;
uint64_t orgFuncStart = info.start_ip;
co->setInfoBasedOnIPRegister(false);
// and adjust REG_SP if there was a DW_CFA_GNU_args_size
if ((orgFuncStart == info.start_ip) && (orgArgSize != 0))
co->setReg(UNW_REG_SP, co->getReg(UNW_REG_SP) + orgArgSize);
}
return UNW_ESUCCESS;
}
return UNW_EBADREG;
}
/// Get value of specified float register at cursor position in stack frame.
_LIBUNWIND_EXPORT int unw_get_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
unw_fpreg_t *value) {
_LIBUNWIND_TRACE_API("unw_get_fpreg(cursor=%p, regNum=%d, &value=%p)\n",
cursor, regNum, value);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
if (co->validFloatReg(regNum)) {
*value = co->getFloatReg(regNum);
return UNW_ESUCCESS;
}
return UNW_EBADREG;
}
/// Set value of specified float register at cursor position in stack frame.
_LIBUNWIND_EXPORT int unw_set_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
unw_fpreg_t value) {
_LIBUNWIND_TRACE_API("unw_set_fpreg(cursor=%p, regNum=%d, value=%g)\n",
cursor, regNum, value);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
if (co->validFloatReg(regNum)) {
co->setFloatReg(regNum, value);
return UNW_ESUCCESS;
}
return UNW_EBADREG;
}
/// Move cursor to next frame.
_LIBUNWIND_EXPORT int unw_step(unw_cursor_t *cursor) {
_LIBUNWIND_TRACE_API("unw_step(cursor=%p)\n", cursor);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
return co->step();
}
/// Get unwind info at cursor position in stack frame.
_LIBUNWIND_EXPORT int unw_get_proc_info(unw_cursor_t *cursor,
unw_proc_info_t *info) {
_LIBUNWIND_TRACE_API("unw_get_proc_info(cursor=%p, &info=%p)\n",
cursor, info);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
co->getInfo(info);
if (info->end_ip == 0)
return UNW_ENOINFO;
else
return UNW_ESUCCESS;
}
/// Resume execution at cursor position (aka longjump).
_LIBUNWIND_EXPORT int unw_resume(unw_cursor_t *cursor) {
_LIBUNWIND_TRACE_API("unw_resume(cursor=%p)\n", cursor);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
co->jumpto();
return UNW_EUNSPEC;
}
/// Get name of function at cursor position in stack frame.
_LIBUNWIND_EXPORT int unw_get_proc_name(unw_cursor_t *cursor, char *buf,
size_t bufLen, unw_word_t *offset) {
_LIBUNWIND_TRACE_API("unw_get_proc_name(cursor=%p, &buf=%p,"
"bufLen=%ld)\n", cursor, buf, bufLen);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
if (co->getFunctionName(buf, bufLen, offset))
return UNW_ESUCCESS;
else
return UNW_EUNSPEC;
}
/// Checks if a register is a floating-point register.
_LIBUNWIND_EXPORT int unw_is_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum) {
_LIBUNWIND_TRACE_API("unw_is_fpreg(cursor=%p, regNum=%d)\n",
cursor, regNum);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
return co->validFloatReg(regNum);
}
/// Checks if a register is a floating-point register.
_LIBUNWIND_EXPORT const char *unw_regname(unw_cursor_t *cursor,
unw_regnum_t regNum) {
_LIBUNWIND_TRACE_API("unw_regname(cursor=%p, regNum=%d)\n",
cursor, regNum);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
return co->getRegisterName(regNum);
}
/// Checks if current frame is signal trampoline.
_LIBUNWIND_EXPORT int unw_is_signal_frame(unw_cursor_t *cursor) {
_LIBUNWIND_TRACE_API("unw_is_signal_frame(cursor=%p)\n", cursor);
AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
return co->isSignalFrame();
}
#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
/// SPI: walks cached dwarf entries
_LIBUNWIND_EXPORT void unw_iterate_dwarf_unwind_cache(void (*func)(
unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) {
_LIBUNWIND_TRACE_API("unw_iterate_dwarf_unwind_cache(func=%p)\n", func);
DwarfFDECache<LocalAddressSpace>::iterateCacheEntries(func);
}
/// IPI: for __register_frame()
void _unw_add_dynamic_fde(unw_word_t fde) {
CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
const char *message = CFI_Parser<LocalAddressSpace>::decodeFDE(
LocalAddressSpace::sThisAddressSpace,
(LocalAddressSpace::pint_t) fde, &fdeInfo, &cieInfo);
if (message == NULL) {
// dynamically registered FDEs don't have a mach_header group they are in.
// Use fde as mh_group
unw_word_t mh_group = fdeInfo.fdeStart;
DwarfFDECache<LocalAddressSpace>::add((LocalAddressSpace::pint_t)mh_group,
fdeInfo.pcStart, fdeInfo.pcEnd,
fdeInfo.fdeStart);
} else {
_LIBUNWIND_DEBUG_LOG("_unw_add_dynamic_fde: bad fde: %s", message);
}
}
/// IPI: for __deregister_frame()
void _unw_remove_dynamic_fde(unw_word_t fde) {
// fde is own mh_group
DwarfFDECache<LocalAddressSpace>::removeAllIn((LocalAddressSpace::pint_t)fde);
}
#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS
// Add logging hooks in Debug builds only
#ifndef NDEBUG
_LIBUNWIND_HIDDEN
bool logAPIs() {
// do manual lock to avoid use of _cxa_guard_acquire or initializers
static bool checked = false;
static bool log = false;
if (!checked) {
log = (getenv("LIBUNWIND_PRINT_APIS") != NULL);
checked = true;
}
return log;
}
_LIBUNWIND_HIDDEN
bool logUnwinding() {
// do manual lock to avoid use of _cxa_guard_acquire or initializers
static bool checked = false;
static bool log = false;
if (!checked) {
log = (getenv("LIBUNWIND_PRINT_UNWINDING") != NULL);
checked = true;
}
return log;
}
#endif // NDEBUG

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//===------------------------ libunwind_ext.h -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Extensions to libunwind API.
//
//===----------------------------------------------------------------------===//
#ifndef __LIBUNWIND_EXT__
#define __LIBUNWIND_EXT__
#include <libunwind.h>
#define UNW_STEP_SUCCESS 1
#define UNW_STEP_END 0
#ifdef __cplusplus
extern "C" {
#endif
// SPI
extern void unw_iterate_dwarf_unwind_cache(void (*func)(unw_word_t ip_start,
unw_word_t ip_end,
unw_word_t fde,
unw_word_t mh));
// IPI
extern void _unw_add_dynamic_fde(unw_word_t fde);
extern void _unw_remove_dynamic_fde(unw_word_t fde);
#ifdef __cplusplus
}
#endif
#endif // __LIBUNWIND_EXT__

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//===-------------------------- unwind_ext.h ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// Extensions to unwind API.
//
//===----------------------------------------------------------------------===//
#ifndef __UNWIND_EXT__
#define __UNWIND_EXT__
#include "unwind.h"
#ifdef __cplusplus
extern "C" {
#endif
// These platform specific functions to get and set the top context are
// implemented elsewhere.
extern struct _Unwind_FunctionContext *
__Unwind_SjLj_GetTopOfFunctionStack();
extern void
__Unwind_SjLj_SetTopOfFunctionStack(struct _Unwind_FunctionContext *fc);
#ifdef __cplusplus
}
#endif
#endif // __UNWIND_EXT__