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LoongArch: Add ORC stack unwinder support 

commit cb8a2ef0848ca80d67d6d56e2df757cfdf6b3355 upstream.

The kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which is
similar in concept to a DWARF unwinder. The difference is that the format
of the ORC data is much simpler than DWARF, which in turn allows the ORC
unwinder to be much simpler and faster.

The ORC data consists of unwind tables which are generated by objtool.
After analyzing all the code paths of a .o file, it determines information
about the stack state at each instruction address in the file and outputs
that information to the .orc_unwind and .orc_unwind_ip sections.

The per-object ORC sections are combined at link time and are sorted and
post-processed at boot time. The unwinder uses the resulting data to
correlate instruction addresses with their stack states at run time.

Most of the logic are similar with x86, in order to get ra info before ra
is saved into stack, add ra_reg and ra_offset into orc_entry. At the same
time, modify some arch-specific code to silence the objtool warnings.

Co-developed-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Co-developed-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tiezhu Yang 2024-03-11 22:23:47 +08:00
parent 69b3f5cd6e
commit 559ae71cef
37 changed files with 875 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/loongarch/Kconfig
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@ -135,6 +135,7 @@ config LOONGARCH
select HAVE_KVM select HAVE_KVM
select HAVE_MOD_ARCH_SPECIFIC select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI select HAVE_NMI
select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS
select HAVE_PCI select HAVE_PCI
select HAVE_PERF_EVENTS select HAVE_PERF_EVENTS
select HAVE_PERF_REGS select HAVE_PERF_REGS
@ -145,6 +146,7 @@ config LOONGARCH
select HAVE_SAMPLE_FTRACE_DIRECT select HAVE_SAMPLE_FTRACE_DIRECT
select HAVE_SAMPLE_FTRACE_DIRECT_MULTI select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
select HAVE_SETUP_PER_CPU_AREA if NUMA select HAVE_SETUP_PER_CPU_AREA if NUMA
select HAVE_STACK_VALIDATION if HAVE_OBJTOOL
select HAVE_STACKPROTECTOR select HAVE_STACKPROTECTOR
select ARCH_HAS_PHYS_TO_DMA select ARCH_HAS_PHYS_TO_DMA
select HAVE_SYSCALL_TRACEPOINTS select HAVE_SYSCALL_TRACEPOINTS

11
arch/loongarch/Kconfig.debug
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@ -26,4 +26,15 @@ config UNWINDER_PROLOGUE
Some of the addresses it reports may be incorrect (but better than the Some of the addresses it reports may be incorrect (but better than the
Guess unwinder). Guess unwinder).
config UNWINDER_ORC
bool "ORC unwinder"
select OBJTOOL
help
This option enables the ORC (Oops Rewind Capability) unwinder for
unwinding kernel stack traces. It uses a custom data format which is
a simplified version of the DWARF Call Frame Information standard.
Enabling this option will increase the kernel's runtime memory usage
by roughly 2-4MB, depending on your kernel config.
endchoice endchoice

23
arch/loongarch/Makefile
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@ -25,6 +25,18 @@ endif
32bit-emul = elf32loongarch 32bit-emul = elf32loongarch
64bit-emul = elf64loongarch 64bit-emul = elf64loongarch
ifdef CONFIG_UNWINDER_ORC
orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h
orc_hash_sh := $(srctree)/scripts/orc_hash.sh
targets += $(orc_hash_h)
quiet_cmd_orc_hash = GEN $@
cmd_orc_hash = mkdir -p $(dir $@); \
$(CONFIG_SHELL) $(orc_hash_sh) < $< > $@
$(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE
$(call if_changed,orc_hash)
archprepare: $(orc_hash_h)
endif
ifdef CONFIG_DYNAMIC_FTRACE ifdef CONFIG_DYNAMIC_FTRACE
KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
CC_FLAGS_FTRACE := -fpatchable-function-entry=2 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
@ -68,8 +80,6 @@ LDFLAGS_vmlinux += -static -n -nostdlib
ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
cflags-y += $(call cc-option,-mexplicit-relocs) cflags-y += $(call cc-option,-mexplicit-relocs)
KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access) KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access)
KBUILD_AFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
else else
cflags-y += $(call cc-option,-mno-explicit-relocs) cflags-y += $(call cc-option,-mno-explicit-relocs)
KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
@ -78,6 +88,15 @@ KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs
KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
endif endif
KBUILD_AFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_CFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_AFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
ifdef CONFIG_OBJTOOL
KBUILD_CFLAGS += -fno-jump-tables
endif
ifeq ($(CONFIG_RELOCATABLE),y) ifeq ($(CONFIG_RELOCATABLE),y)
KBUILD_CFLAGS_KERNEL += -fPIE KBUILD_CFLAGS_KERNEL += -fPIE
LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs) LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)

2
arch/loongarch/include/asm/Kbuild
View File

@ -1,4 +1,6 @@
# SPDX-License-Identifier: GPL-2.0 # SPDX-License-Identifier: GPL-2.0
generated-y += orc_hash.h
generic-y += dma-contiguous.h generic-y += dma-contiguous.h
generic-y += mcs_spinlock.h generic-y += mcs_spinlock.h
generic-y += parport.h generic-y += parport.h

1
arch/loongarch/include/asm/bug.h
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@ -44,6 +44,7 @@
do { \ do { \
instrumentation_begin(); \ instrumentation_begin(); \
__BUG_FLAGS(BUGFLAG_WARNING|(flags)); \ __BUG_FLAGS(BUGFLAG_WARNING|(flags)); \
annotate_reachable(); \
instrumentation_end(); \ instrumentation_end(); \
} while (0) } while (0)

2
arch/loongarch/include/asm/exception.h
View File

@ -6,6 +6,8 @@
#include <asm/ptrace.h> #include <asm/ptrace.h>
#include <linux/kprobes.h> #include <linux/kprobes.h>
extern void *exception_table[];
void show_registers(struct pt_regs *regs); void show_registers(struct pt_regs *regs);
asmlinkage void cache_parity_error(void); asmlinkage void cache_parity_error(void);

7
arch/loongarch/include/asm/module.h
View File

@ -6,6 +6,7 @@
#define _ASM_MODULE_H #define _ASM_MODULE_H
#include <asm/inst.h> #include <asm/inst.h>
#include <asm/orc_types.h>
#include <asm-generic/module.h> #include <asm-generic/module.h>
#define RELA_STACK_DEPTH 16 #define RELA_STACK_DEPTH 16
@ -21,6 +22,12 @@ struct mod_arch_specific {
struct mod_section plt; struct mod_section plt;
struct mod_section plt_idx; struct mod_section plt_idx;
#ifdef CONFIG_UNWINDER_ORC
unsigned int num_orcs;
int *orc_unwind_ip;
struct orc_entry *orc_unwind;
#endif
/* For CONFIG_DYNAMIC_FTRACE */ /* For CONFIG_DYNAMIC_FTRACE */
struct plt_entry *ftrace_trampolines; struct plt_entry *ftrace_trampolines;
}; };

18
arch/loongarch/include/asm/orc_header.h Normal file
View File

@ -0,0 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_HEADER_H
#define _ORC_HEADER_H
#include <linux/types.h>
#include <linux/compiler.h>
#include <asm/orc_hash.h>
/*
* The header is currently a 20-byte hash of the ORC entry definition; see
* scripts/orc_hash.sh.
*/
#define ORC_HEADER \
__used __section(".orc_header") __aligned(4) \
static const u8 orc_header[] = { ORC_HASH }
#endif /* _ORC_HEADER_H */

31
arch/loongarch/include/asm/orc_lookup.h Normal file
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@ -0,0 +1,31 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_LOOKUP_H
#define _ORC_LOOKUP_H
/*
* This is a lookup table for speeding up access to the .orc_unwind table.
* Given an input address offset, the corresponding lookup table entry
* specifies a subset of the .orc_unwind table to search.
*
* Each block represents the end of the previous range and the start of the
* next range. An extra block is added to give the last range an end.
*
* The block size should be a power of 2 to avoid a costly 'div' instruction.
*
* A block size of 256 was chosen because it roughly doubles unwinder
* performance while only adding ~5% to the ORC data footprint.
*/
#define LOOKUP_BLOCK_ORDER 8
#define LOOKUP_BLOCK_SIZE (1 << LOOKUP_BLOCK_ORDER)
#ifndef LINKER_SCRIPT
extern unsigned int orc_lookup[];
extern unsigned int orc_lookup_end[];
#define LOOKUP_START_IP (unsigned long)_stext
#define LOOKUP_STOP_IP (unsigned long)_etext
#endif /* LINKER_SCRIPT */
#endif /* _ORC_LOOKUP_H */

58
arch/loongarch/include/asm/orc_types.h Normal file
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@ -0,0 +1,58 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_TYPES_H
#define _ORC_TYPES_H
#include <linux/types.h>
/*
* The ORC_REG_* registers are base registers which are used to find other
* registers on the stack.
*
* ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
* address of the previous frame: the caller's SP before it called the current
* function.
*
* ORC_REG_UNDEFINED means the corresponding register's value didn't change in
* the current frame.
*
* The most commonly used base registers are SP and FP -- which the previous SP
* is usually based on -- and PREV_SP and UNDEFINED -- which the previous FP is
* usually based on.
*
* The rest of the base registers are needed for special cases like entry code
* and GCC realigned stacks.
*/
#define ORC_REG_UNDEFINED 0
#define ORC_REG_PREV_SP 1
#define ORC_REG_SP 2
#define ORC_REG_FP 3
#define ORC_REG_MAX 4
#define ORC_TYPE_UNDEFINED 0
#define ORC_TYPE_END_OF_STACK 1
#define ORC_TYPE_CALL 2
#define ORC_TYPE_REGS 3
#define ORC_TYPE_REGS_PARTIAL 4
#ifndef __ASSEMBLY__
/*
* This struct is more or less a vastly simplified version of the DWARF Call
* Frame Information standard. It contains only the necessary parts of DWARF
* CFI, simplified for ease of access by the in-kernel unwinder. It tells the
* unwinder how to find the previous SP and FP (and sometimes entry regs) on
* the stack for a given code address. Each instance of the struct corresponds
* to one or more code locations.
*/
struct orc_entry {
s16 sp_offset;
s16 fp_offset;
s16 ra_offset;
unsigned int sp_reg:4;
unsigned int fp_reg:4;
unsigned int ra_reg:4;
unsigned int type:3;
unsigned int signal:1;
};
#endif /* __ASSEMBLY__ */
#endif /* _ORC_TYPES_H */

3
arch/loongarch/include/asm/stackframe.h
View File

@ -13,6 +13,7 @@
#include <asm/asm-offsets.h> #include <asm/asm-offsets.h>
#include <asm/loongarch.h> #include <asm/loongarch.h>
#include <asm/thread_info.h> #include <asm/thread_info.h>
#include <asm/unwind_hints.h>
/* Make the addition of cfi info a little easier. */ /* Make the addition of cfi info a little easier. */
.macro cfi_rel_offset reg offset=0 docfi=0 .macro cfi_rel_offset reg offset=0 docfi=0
@ -173,6 +174,7 @@
li.w t0, CSR_CRMD_WE li.w t0, CSR_CRMD_WE
csrxchg t0, t0, LOONGARCH_CSR_CRMD csrxchg t0, t0, LOONGARCH_CSR_CRMD
#endif #endif
UNWIND_HINT_REGS
.endm .endm
.macro SAVE_ALL docfi=0 .macro SAVE_ALL docfi=0
@ -230,6 +232,7 @@
.macro RESTORE_SP_AND_RET docfi=0 .macro RESTORE_SP_AND_RET docfi=0
cfi_ld sp, PT_R3, \docfi cfi_ld sp, PT_R3, \docfi
UNWIND_HINT_FUNC
ertn ertn
.endm .endm

20
arch/loongarch/include/asm/unwind.h
View File

@ -16,6 +16,7 @@
enum unwinder_type { enum unwinder_type {
UNWINDER_GUESS, UNWINDER_GUESS,
UNWINDER_PROLOGUE, UNWINDER_PROLOGUE,
UNWINDER_ORC,
}; };
struct unwind_state { struct unwind_state {
@ -24,7 +25,7 @@ struct unwind_state {
struct task_struct *task; struct task_struct *task;
bool first, error, reset; bool first, error, reset;
int graph_idx; int graph_idx;
unsigned long sp, pc, ra; unsigned long sp, fp, pc, ra;
}; };
bool default_next_frame(struct unwind_state *state); bool default_next_frame(struct unwind_state *state);
@ -61,14 +62,17 @@ static __always_inline void __unwind_start(struct unwind_state *state,
state->sp = regs->regs[3]; state->sp = regs->regs[3];
state->pc = regs->csr_era; state->pc = regs->csr_era;
state->ra = regs->regs[1]; state->ra = regs->regs[1];
state->fp = regs->regs[22];
} else if (task && task != current) { } else if (task && task != current) {
state->sp = thread_saved_fp(task); state->sp = thread_saved_fp(task);
state->pc = thread_saved_ra(task); state->pc = thread_saved_ra(task);
state->ra = 0; state->ra = 0;
state->fp = 0;
} else { } else {
state->sp = (unsigned long)__builtin_frame_address(0); state->sp = (unsigned long)__builtin_frame_address(0);
state->pc = (unsigned long)__builtin_return_address(0); state->pc = (unsigned long)__builtin_return_address(0);
state->ra = 0; state->ra = 0;
state->fp = 0;
} }
state->task = task; state->task = task;
get_stack_info(state->sp, state->task, &state->stack_info); get_stack_info(state->sp, state->task, &state->stack_info);
@ -77,6 +81,18 @@ static __always_inline void __unwind_start(struct unwind_state *state,
static __always_inline unsigned long __unwind_get_return_address(struct unwind_state *state) static __always_inline unsigned long __unwind_get_return_address(struct unwind_state *state)
{ {
return unwind_done(state) ? 0 : state->pc; if (unwind_done(state))
return 0;
return __kernel_text_address(state->pc) ? state->pc : 0;
} }
#ifdef CONFIG_UNWINDER_ORC
void unwind_init(void);
void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size);
#else
static inline void unwind_init(void) {}
static inline void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size) {}
#endif
#endif /* _ASM_UNWIND_H */ #endif /* _ASM_UNWIND_H */

28
arch/loongarch/include/asm/unwind_hints.h Normal file
View File

@ -0,0 +1,28 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_LOONGARCH_UNWIND_HINTS_H
#define _ASM_LOONGARCH_UNWIND_HINTS_H
#include <linux/objtool.h>
#include <asm/orc_types.h>
#ifdef __ASSEMBLY__
.macro UNWIND_HINT_UNDEFINED
UNWIND_HINT type=UNWIND_HINT_TYPE_UNDEFINED
.endm
.macro UNWIND_HINT_END_OF_STACK
UNWIND_HINT type=UNWIND_HINT_TYPE_END_OF_STACK
.endm
.macro UNWIND_HINT_REGS
UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_REGS
.endm
.macro UNWIND_HINT_FUNC
UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_CALL
.endm
#endif /* __ASSEMBLY__ */
#endif /* _ASM_LOONGARCH_UNWIND_HINTS_H */

4
arch/loongarch/kernel/Makefile
View File

@ -3,6 +3,8 @@
# Makefile for the Linux/LoongArch kernel. # Makefile for the Linux/LoongArch kernel.
# #
OBJECT_FILES_NON_STANDARD_head.o := y
extra-y := vmlinux.lds extra-y := vmlinux.lds
obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \ obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
@ -22,6 +24,7 @@ obj-$(CONFIG_ARCH_STRICT_ALIGN) += unaligned.o
CFLAGS_module.o += $(call cc-option,-Wno-override-init,) CFLAGS_module.o += $(call cc-option,-Wno-override-init,)
CFLAGS_syscall.o += $(call cc-option,-Wno-override-init,) CFLAGS_syscall.o += $(call cc-option,-Wno-override-init,)
CFLAGS_traps.o += $(call cc-option,-Wno-override-init,)
CFLAGS_perf_event.o += $(call cc-option,-Wno-override-init,) CFLAGS_perf_event.o += $(call cc-option,-Wno-override-init,)
ifdef CONFIG_FUNCTION_TRACER ifdef CONFIG_FUNCTION_TRACER
@ -64,6 +67,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o
obj-$(CONFIG_UNWINDER_ORC) += unwind_orc.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o

5
arch/loongarch/kernel/entry.S
View File

@ -14,11 +14,13 @@
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/stackframe.h> #include <asm/stackframe.h>
#include <asm/thread_info.h> #include <asm/thread_info.h>
#include <asm/unwind_hints.h>
.text .text
.cfi_sections .debug_frame .cfi_sections .debug_frame
.align 5 .align 5
SYM_CODE_START(handle_syscall) SYM_CODE_START(handle_syscall)
UNWIND_HINT_UNDEFINED
csrrd t0, PERCPU_BASE_KS csrrd t0, PERCPU_BASE_KS
la.pcrel t1, kernelsp la.pcrel t1, kernelsp
add.d t1, t1, t0 add.d t1, t1, t0
@ -57,6 +59,7 @@ SYM_CODE_START(handle_syscall)
cfi_st fp, PT_R22 cfi_st fp, PT_R22
SAVE_STATIC SAVE_STATIC
UNWIND_HINT_REGS
#ifdef CONFIG_KGDB #ifdef CONFIG_KGDB
li.w t1, CSR_CRMD_WE li.w t1, CSR_CRMD_WE
@ -75,6 +78,7 @@ SYM_CODE_END(handle_syscall)
_ASM_NOKPROBE(handle_syscall) _ASM_NOKPROBE(handle_syscall)
SYM_CODE_START(ret_from_fork) SYM_CODE_START(ret_from_fork)
UNWIND_HINT_REGS
bl schedule_tail # a0 = struct task_struct *prev bl schedule_tail # a0 = struct task_struct *prev
move a0, sp move a0, sp
bl syscall_exit_to_user_mode bl syscall_exit_to_user_mode
@ -84,6 +88,7 @@ SYM_CODE_START(ret_from_fork)
SYM_CODE_END(ret_from_fork) SYM_CODE_END(ret_from_fork)
SYM_CODE_START(ret_from_kernel_thread) SYM_CODE_START(ret_from_kernel_thread)
UNWIND_HINT_REGS
bl schedule_tail # a0 = struct task_struct *prev bl schedule_tail # a0 = struct task_struct *prev
move a0, s1 move a0, s1
jirl ra, s0, 0 jirl ra, s0, 0

7
arch/loongarch/kernel/fpu.S
View File

@ -15,6 +15,7 @@
#include <asm/fpregdef.h> #include <asm/fpregdef.h>
#include <asm/loongarch.h> #include <asm/loongarch.h>
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/unwind_hints.h>
#define FPU_REG_WIDTH 8 #define FPU_REG_WIDTH 8
#define LSX_REG_WIDTH 16 #define LSX_REG_WIDTH 16
@ -526,3 +527,9 @@ SYM_FUNC_END(_restore_lasx_context)
.L_fpu_fault: .L_fpu_fault:
li.w a0, -EFAULT # failure li.w a0, -EFAULT # failure
jr ra jr ra
#ifdef CONFIG_CPU_HAS_LBT
STACK_FRAME_NON_STANDARD _restore_fp
STACK_FRAME_NON_STANDARD _restore_lsx
STACK_FRAME_NON_STANDARD _restore_lasx
#endif

6
arch/loongarch/kernel/genex.S
View File

@ -32,6 +32,7 @@ SYM_FUNC_START(__arch_cpu_idle)
SYM_FUNC_END(__arch_cpu_idle) SYM_FUNC_END(__arch_cpu_idle)
SYM_CODE_START(handle_vint) SYM_CODE_START(handle_vint)
UNWIND_HINT_UNDEFINED
BACKUP_T0T1 BACKUP_T0T1
SAVE_ALL SAVE_ALL
la_abs t1, __arch_cpu_idle la_abs t1, __arch_cpu_idle
@ -49,6 +50,7 @@ SYM_CODE_START(handle_vint)
SYM_CODE_END(handle_vint) SYM_CODE_END(handle_vint)
SYM_CODE_START(except_vec_cex) SYM_CODE_START(except_vec_cex)
UNWIND_HINT_UNDEFINED
b cache_parity_error b cache_parity_error
SYM_CODE_END(except_vec_cex) SYM_CODE_END(except_vec_cex)
@ -67,6 +69,7 @@ SYM_CODE_END(except_vec_cex)
.macro BUILD_HANDLER exception handler prep .macro BUILD_HANDLER exception handler prep
.align 5 .align 5
SYM_CODE_START(handle_\exception) SYM_CODE_START(handle_\exception)
UNWIND_HINT_UNDEFINED
666: 666:
BACKUP_T0T1 BACKUP_T0T1
SAVE_ALL SAVE_ALL
@ -77,7 +80,9 @@ SYM_CODE_END(except_vec_cex)
668: 668:
RESTORE_ALL_AND_RET RESTORE_ALL_AND_RET
SYM_CODE_END(handle_\exception) SYM_CODE_END(handle_\exception)
.pushsection ".data", "aw", %progbits
SYM_DATA(unwind_hint_\exception, .word 668b - 666b) SYM_DATA(unwind_hint_\exception, .word 668b - 666b)
.popsection
.endm .endm
BUILD_HANDLER ade ade badv BUILD_HANDLER ade ade badv
@ -94,6 +99,7 @@ SYM_CODE_END(except_vec_cex)
BUILD_HANDLER reserved reserved none /* others */ BUILD_HANDLER reserved reserved none /* others */
SYM_CODE_START(handle_sys) SYM_CODE_START(handle_sys)
UNWIND_HINT_UNDEFINED
la_abs t0, handle_syscall la_abs t0, handle_syscall
jr t0 jr t0
SYM_CODE_END(handle_sys) SYM_CODE_END(handle_sys)

3
arch/loongarch/kernel/lbt.S
View File

@ -11,6 +11,7 @@
#include <asm/asm-offsets.h> #include <asm/asm-offsets.h>
#include <asm/errno.h> #include <asm/errno.h>
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/unwind_hints.h>
#define SCR_REG_WIDTH 8 #define SCR_REG_WIDTH 8
@ -153,3 +154,5 @@ SYM_FUNC_END(_restore_ftop_context)
.L_lbt_fault: .L_lbt_fault:
li.w a0, -EFAULT # failure li.w a0, -EFAULT # failure
jr ra jr ra
STACK_FRAME_NON_STANDARD _restore_ftop_context

6
arch/loongarch/kernel/mcount_dyn.S
View File

@ -73,6 +73,7 @@ SYM_FUNC_START(ftrace_stub)
SYM_FUNC_END(ftrace_stub) SYM_FUNC_END(ftrace_stub)
SYM_CODE_START(ftrace_common) SYM_CODE_START(ftrace_common)
UNWIND_HINT_UNDEFINED
PTR_ADDI a0, ra, -8 /* arg0: ip */ PTR_ADDI a0, ra, -8 /* arg0: ip */
move a1, t0 /* arg1: parent_ip */ move a1, t0 /* arg1: parent_ip */
la.pcrel t1, function_trace_op la.pcrel t1, function_trace_op
@ -113,12 +114,14 @@ ftrace_common_return:
SYM_CODE_END(ftrace_common) SYM_CODE_END(ftrace_common)
SYM_CODE_START(ftrace_caller) SYM_CODE_START(ftrace_caller)
UNWIND_HINT_UNDEFINED
ftrace_regs_entry allregs=0 ftrace_regs_entry allregs=0
b ftrace_common b ftrace_common
SYM_CODE_END(ftrace_caller) SYM_CODE_END(ftrace_caller)
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
SYM_CODE_START(ftrace_regs_caller) SYM_CODE_START(ftrace_regs_caller)
UNWIND_HINT_UNDEFINED
ftrace_regs_entry allregs=1 ftrace_regs_entry allregs=1
b ftrace_common b ftrace_common
SYM_CODE_END(ftrace_regs_caller) SYM_CODE_END(ftrace_regs_caller)
@ -126,6 +129,7 @@ SYM_CODE_END(ftrace_regs_caller)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER #ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_CODE_START(ftrace_graph_caller) SYM_CODE_START(ftrace_graph_caller)
UNWIND_HINT_UNDEFINED
PTR_L a0, sp, PT_ERA PTR_L a0, sp, PT_ERA
PTR_ADDI a0, a0, -8 /* arg0: self_addr */ PTR_ADDI a0, a0, -8 /* arg0: self_addr */
PTR_ADDI a1, sp, PT_R1 /* arg1: parent */ PTR_ADDI a1, sp, PT_R1 /* arg1: parent */
@ -134,6 +138,7 @@ SYM_CODE_START(ftrace_graph_caller)
SYM_CODE_END(ftrace_graph_caller) SYM_CODE_END(ftrace_graph_caller)
SYM_CODE_START(return_to_handler) SYM_CODE_START(return_to_handler)
UNWIND_HINT_UNDEFINED
/* Save return value regs */ /* Save return value regs */
PTR_ADDI sp, sp, -FGRET_REGS_SIZE PTR_ADDI sp, sp, -FGRET_REGS_SIZE
PTR_S a0, sp, FGRET_REGS_A0 PTR_S a0, sp, FGRET_REGS_A0
@ -155,6 +160,7 @@ SYM_CODE_END(return_to_handler)
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
SYM_CODE_START(ftrace_stub_direct_tramp) SYM_CODE_START(ftrace_stub_direct_tramp)
UNWIND_HINT_UNDEFINED
jr t0 jr t0
SYM_CODE_END(ftrace_stub_direct_tramp) SYM_CODE_END(ftrace_stub_direct_tramp)
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */

22
arch/loongarch/kernel/module.c
View File

@ -20,6 +20,7 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <asm/alternative.h> #include <asm/alternative.h>
#include <asm/inst.h> #include <asm/inst.h>
#include <asm/unwind.h>
static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top) static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top)
{ {
@ -515,15 +516,28 @@ static void module_init_ftrace_plt(const Elf_Ehdr *hdr,
int module_finalize(const Elf_Ehdr *hdr, int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs, struct module *mod) const Elf_Shdr *sechdrs, struct module *mod)
{ {
const Elf_Shdr *s, *se;
const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
const Elf_Shdr *s, *alt = NULL, *orc = NULL, *orc_ip = NULL, *ftrace = NULL;
for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) { for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
if (!strcmp(".altinstructions", secstrs + s->sh_name)) if (!strcmp(".altinstructions", secstrs + s->sh_name))
apply_alternatives((void *)s->sh_addr, (void *)s->sh_addr + s->sh_size); alt = s;
if (!strcmp(".orc_unwind", secstrs + s->sh_name))
orc = s;
if (!strcmp(".orc_unwind_ip", secstrs + s->sh_name))
orc_ip = s;
if (!strcmp(".ftrace_trampoline", secstrs + s->sh_name)) if (!strcmp(".ftrace_trampoline", secstrs + s->sh_name))
module_init_ftrace_plt(hdr, s, mod); ftrace = s;
} }
if (alt)
apply_alternatives((void *)alt->sh_addr, (void *)alt->sh_addr + alt->sh_size);
if (orc && orc_ip)
unwind_module_init(mod, (void *)orc_ip->sh_addr, orc_ip->sh_size, (void *)orc->sh_addr, orc->sh_size);
if (ftrace)
module_init_ftrace_plt(hdr, ftrace, mod);
return 0; return 0;
} }

7
arch/loongarch/kernel/relocate_kernel.S
View File

@ -15,6 +15,7 @@
#include <asm/addrspace.h> #include <asm/addrspace.h>
SYM_CODE_START(relocate_new_kernel) SYM_CODE_START(relocate_new_kernel)
UNWIND_HINT_UNDEFINED
/* /*
* a0: EFI boot flag for the new kernel * a0: EFI boot flag for the new kernel
* a1: Command line pointer for the new kernel * a1: Command line pointer for the new kernel
@ -90,6 +91,7 @@ SYM_CODE_END(relocate_new_kernel)
* then start at the entry point from LOONGARCH_IOCSR_MBUF0. * then start at the entry point from LOONGARCH_IOCSR_MBUF0.
*/ */
SYM_CODE_START(kexec_smp_wait) SYM_CODE_START(kexec_smp_wait)
UNWIND_HINT_UNDEFINED
1: li.w t0, 0x100 /* wait for init loop */ 1: li.w t0, 0x100 /* wait for init loop */
2: addi.w t0, t0, -1 /* limit mailbox access */ 2: addi.w t0, t0, -1 /* limit mailbox access */
bnez t0, 2b bnez t0, 2b
@ -106,6 +108,5 @@ SYM_CODE_END(kexec_smp_wait)
relocate_new_kernel_end: relocate_new_kernel_end:
SYM_DATA_START(relocate_new_kernel_size) .section ".data"
PTR relocate_new_kernel_end - relocate_new_kernel SYM_DATA(relocate_new_kernel_size, .long relocate_new_kernel_end - relocate_new_kernel)
SYM_DATA_END(relocate_new_kernel_size)

1
arch/loongarch/kernel/rethook_trampoline.S
View File

@ -76,6 +76,7 @@
.endm .endm
SYM_CODE_START(arch_rethook_trampoline) SYM_CODE_START(arch_rethook_trampoline)
UNWIND_HINT_UNDEFINED
addi.d sp, sp, -PT_SIZE addi.d sp, sp, -PT_SIZE
save_all_base_regs save_all_base_regs

2
arch/loongarch/kernel/setup.c
View File

@ -48,6 +48,7 @@
#include <asm/sections.h> #include <asm/sections.h>
#include <asm/setup.h> #include <asm/setup.h>
#include <asm/time.h> #include <asm/time.h>
#include <asm/unwind.h>
#include "legacy_boot.h" #include "legacy_boot.h"
#define SMBIOS_BIOSSIZE_OFFSET 0x09 #define SMBIOS_BIOSSIZE_OFFSET 0x09
@ -649,6 +650,7 @@ static void __init prefill_possible_map(void)
void __init setup_arch(char **cmdline_p) void __init setup_arch(char **cmdline_p)
{ {
cpu_probe(); cpu_probe();
unwind_init();
init_environ(); init_environ();
efi_init(); efi_init();

1
arch/loongarch/kernel/stacktrace.c
View File

@ -29,6 +29,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
regs->csr_era = thread_saved_ra(task); regs->csr_era = thread_saved_ra(task);
} }
regs->regs[1] = 0; regs->regs[1] = 0;
regs->regs[22] = 0;
} }
for (unwind_start(&state, task, regs); for (unwind_start(&state, task, regs);

42
arch/loongarch/kernel/traps.c
View File

@ -53,6 +53,32 @@
#include "access-helper.h" #include "access-helper.h"
void *exception_table[EXCCODE_INT_START] = {
[0 ... EXCCODE_INT_START - 1] = handle_reserved,
[EXCCODE_TLBI] = handle_tlb_load,
[EXCCODE_TLBL] = handle_tlb_load,
[EXCCODE_TLBS] = handle_tlb_store,
[EXCCODE_TLBM] = handle_tlb_modify,
[EXCCODE_TLBNR] = handle_tlb_protect,
[EXCCODE_TLBNX] = handle_tlb_protect,
[EXCCODE_TLBPE] = handle_tlb_protect,
[EXCCODE_ADE] = handle_ade,
[EXCCODE_ALE] = handle_ale,
[EXCCODE_BCE] = handle_bce,
[EXCCODE_SYS] = handle_sys,
[EXCCODE_BP] = handle_bp,
[EXCCODE_INE] = handle_ri,
[EXCCODE_IPE] = handle_ri,
[EXCCODE_FPDIS] = handle_fpu,
[EXCCODE_LSXDIS] = handle_lsx,
[EXCCODE_LASXDIS] = handle_lasx,
[EXCCODE_FPE] = handle_fpe,
[EXCCODE_WATCH] = handle_watch,
[EXCCODE_BTDIS] = handle_lbt,
};
EXPORT_SYMBOL_GPL(exception_table);
static void show_backtrace(struct task_struct *task, const struct pt_regs *regs, static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
const char *loglvl, bool user) const char *loglvl, bool user)
{ {
@ -1150,19 +1176,9 @@ void __init trap_init(void)
for (i = EXCCODE_INT_START; i <= EXCCODE_INT_END; i++) for (i = EXCCODE_INT_START; i <= EXCCODE_INT_END; i++)
set_handler(i * VECSIZE, handle_vint, VECSIZE); set_handler(i * VECSIZE, handle_vint, VECSIZE);
set_handler(EXCCODE_ADE * VECSIZE, handle_ade, VECSIZE); /* Set exception vector handler */
set_handler(EXCCODE_ALE * VECSIZE, handle_ale, VECSIZE); for (i = EXCCODE_ADE; i <= EXCCODE_BTDIS; i++)
set_handler(EXCCODE_BCE * VECSIZE, handle_bce, VECSIZE); set_handler(i * VECSIZE, exception_table[i], VECSIZE);
set_handler(EXCCODE_SYS * VECSIZE, handle_sys, VECSIZE);
set_handler(EXCCODE_BP * VECSIZE, handle_bp, VECSIZE);
set_handler(EXCCODE_INE * VECSIZE, handle_ri, VECSIZE);
set_handler(EXCCODE_IPE * VECSIZE, handle_ri, VECSIZE);
set_handler(EXCCODE_FPDIS * VECSIZE, handle_fpu, VECSIZE);
set_handler(EXCCODE_LSXDIS * VECSIZE, handle_lsx, VECSIZE);
set_handler(EXCCODE_LASXDIS * VECSIZE, handle_lasx, VECSIZE);
set_handler(EXCCODE_FPE * VECSIZE, handle_fpe, VECSIZE);
set_handler(EXCCODE_BTDIS * VECSIZE, handle_lbt, VECSIZE);
set_handler(EXCCODE_WATCH * VECSIZE, handle_watch, VECSIZE);
cache_error_setup(); cache_error_setup();

528
arch/loongarch/kernel/unwind_orc.c Normal file
View File

@ -0,0 +1,528 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/objtool.h>
#include <linux/module.h>
#include <linux/sort.h>
#include <asm/exception.h>
#include <asm/orc_header.h>
#include <asm/orc_lookup.h>
#include <asm/orc_types.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/stacktrace.h>
#include <asm/tlb.h>
#include <asm/unwind.h>
ORC_HEADER;
#define orc_warn(fmt, ...) \
printk_deferred_once(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__)
extern int __start_orc_unwind_ip[];
extern int __stop_orc_unwind_ip[];
extern struct orc_entry __start_orc_unwind[];
extern struct orc_entry __stop_orc_unwind[];
static bool orc_init __ro_after_init;
static unsigned int lookup_num_blocks __ro_after_init;
/* Fake frame pointer entry -- used as a fallback for generated code */
static struct orc_entry orc_fp_entry = {
.sp_reg = ORC_REG_FP,
.sp_offset = 16,
.fp_reg = ORC_REG_PREV_SP,
.fp_offset = -16,
.ra_reg = ORC_REG_PREV_SP,
.ra_offset = -8,
.type = ORC_TYPE_CALL
};
/*
* If we crash with IP==0, the last successfully executed instruction
* was probably an indirect function call with a NULL function pointer,
* and we don't have unwind information for NULL.
* This hardcoded ORC entry for IP==0 allows us to unwind from a NULL function
* pointer into its parent and then continue normally from there.
*/
static struct orc_entry orc_null_entry = {
.sp_reg = ORC_REG_SP,
.sp_offset = sizeof(long),
.fp_reg = ORC_REG_UNDEFINED,
.type = ORC_TYPE_CALL
};
static inline unsigned long orc_ip(const int *ip)
{
return (unsigned long)ip + *ip;
}
static struct orc_entry *__orc_find(int *ip_table, struct orc_entry *u_table,
unsigned int num_entries, unsigned long ip)
{
int *first = ip_table;
int *mid = first, *found = first;
int *last = ip_table + num_entries - 1;
if (!num_entries)
return NULL;
/*
* Do a binary range search to find the rightmost duplicate of a given
* starting address. Some entries are section terminators which are
* "weak" entries for ensuring there are no gaps. They should be
* ignored when they conflict with a real entry.
*/
while (first <= last) {
mid = first + ((last - first) / 2);
if (orc_ip(mid) <= ip) {
found = mid;
first = mid + 1;
} else
last = mid - 1;
}
return u_table + (found - ip_table);
}
#ifdef CONFIG_MODULES
static struct orc_entry *orc_module_find(unsigned long ip)
{
struct module *mod;
mod = __module_address(ip);
if (!mod || !mod->arch.orc_unwind || !mod->arch.orc_unwind_ip)
return NULL;
return __orc_find(mod->arch.orc_unwind_ip, mod->arch.orc_unwind, mod->arch.num_orcs, ip);
}
#else
static struct orc_entry *orc_module_find(unsigned long ip)
{
return NULL;
}
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
static struct orc_entry *orc_find(unsigned long ip);
/*
* Ftrace dynamic trampolines do not have orc entries of their own.
* But they are copies of the ftrace entries that are static and
* defined in ftrace_*.S, which do have orc entries.
*
* If the unwinder comes across a ftrace trampoline, then find the
* ftrace function that was used to create it, and use that ftrace
* function's orc entry, as the placement of the return code in
* the stack will be identical.
*/
static struct orc_entry *orc_ftrace_find(unsigned long ip)
{
struct ftrace_ops *ops;
unsigned long tramp_addr, offset;
ops = ftrace_ops_trampoline(ip);
if (!ops)
return NULL;
/* Set tramp_addr to the start of the code copied by the trampoline */
if (ops->flags & FTRACE_OPS_FL_SAVE_REGS)
tramp_addr = (unsigned long)ftrace_regs_caller;
else
tramp_addr = (unsigned long)ftrace_caller;
/* Now place tramp_addr to the location within the trampoline ip is at */
offset = ip - ops->trampoline;
tramp_addr += offset;
/* Prevent unlikely recursion */
if (ip == tramp_addr)
return NULL;
return orc_find(tramp_addr);
}
#else
static struct orc_entry *orc_ftrace_find(unsigned long ip)
{
return NULL;
}
#endif
static struct orc_entry *orc_find(unsigned long ip)
{
static struct orc_entry *orc;
if (ip == 0)
return &orc_null_entry;
/* For non-init vmlinux addresses, use the fast lookup table: */
if (ip >= LOOKUP_START_IP && ip < LOOKUP_STOP_IP) {
unsigned int idx, start, stop;
idx = (ip - LOOKUP_START_IP) / LOOKUP_BLOCK_SIZE;
if (unlikely((idx >= lookup_num_blocks-1))) {
orc_warn("WARNING: bad lookup idx: idx=%u num=%u ip=%pB\n",
idx, lookup_num_blocks, (void *)ip);
return NULL;
}
start = orc_lookup[idx];
stop = orc_lookup[idx + 1] + 1;
if (unlikely((__start_orc_unwind + start >= __stop_orc_unwind) ||
(__start_orc_unwind + stop > __stop_orc_unwind))) {
orc_warn("WARNING: bad lookup value: idx=%u num=%u start=%u stop=%u ip=%pB\n",
idx, lookup_num_blocks, start, stop, (void *)ip);
return NULL;
}
return __orc_find(__start_orc_unwind_ip + start,
__start_orc_unwind + start, stop - start, ip);
}
/* vmlinux .init slow lookup: */
if (is_kernel_inittext(ip))
return __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
__stop_orc_unwind_ip - __start_orc_unwind_ip, ip);
/* Module lookup: */
orc = orc_module_find(ip);
if (orc)
return orc;
return orc_ftrace_find(ip);
}
#ifdef CONFIG_MODULES
static DEFINE_MUTEX(sort_mutex);
static int *cur_orc_ip_table = __start_orc_unwind_ip;
static struct orc_entry *cur_orc_table = __start_orc_unwind;
static void orc_sort_swap(void *_a, void *_b, int size)
{
int delta = _b - _a;
int *a = _a, *b = _b, tmp;
struct orc_entry *orc_a, *orc_b;
/* Swap the .orc_unwind_ip entries: */
tmp = *a;
*a = *b + delta;
*b = tmp - delta;
/* Swap the corresponding .orc_unwind entries: */
orc_a = cur_orc_table + (a - cur_orc_ip_table);
orc_b = cur_orc_table + (b - cur_orc_ip_table);
swap(*orc_a, *orc_b);
}
static int orc_sort_cmp(const void *_a, const void *_b)
{
const int *a = _a, *b = _b;
unsigned long a_val = orc_ip(a);
unsigned long b_val = orc_ip(b);
struct orc_entry *orc_a;
if (a_val > b_val)
return 1;
if (a_val < b_val)
return -1;
/*
* The "weak" section terminator entries need to always be first
* to ensure the lookup code skips them in favor of real entries.
* These terminator entries exist to handle any gaps created by
* whitelisted .o files which didn't get objtool generation.
*/
orc_a = cur_orc_table + (a - cur_orc_ip_table);
return orc_a->type == ORC_TYPE_UNDEFINED ? -1 : 1;
}
void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size,
void *_orc, size_t orc_size)
{
int *orc_ip = _orc_ip;
struct orc_entry *orc = _orc;
unsigned int num_entries = orc_ip_size / sizeof(int);
WARN_ON_ONCE(orc_ip_size % sizeof(int) != 0 ||
orc_size % sizeof(*orc) != 0 ||
num_entries != orc_size / sizeof(*orc));
/*
* The 'cur_orc_*' globals allow the orc_sort_swap() callback to
* associate an .orc_unwind_ip table entry with its corresponding
* .orc_unwind entry so they can both be swapped.
*/
mutex_lock(&sort_mutex);
cur_orc_ip_table = orc_ip;
cur_orc_table = orc;
sort(orc_ip, num_entries, sizeof(int), orc_sort_cmp, orc_sort_swap);
mutex_unlock(&sort_mutex);
mod->arch.orc_unwind_ip = orc_ip;
mod->arch.orc_unwind = orc;
mod->arch.num_orcs = num_entries;
}
#endif
void __init unwind_init(void)
{
int i;
size_t orc_size = (void *)__stop_orc_unwind - (void *)__start_orc_unwind;
size_t orc_ip_size = (void *)__stop_orc_unwind_ip - (void *)__start_orc_unwind_ip;
size_t num_entries = orc_ip_size / sizeof(int);
struct orc_entry *orc;
if (!num_entries || orc_ip_size % sizeof(int) != 0 ||
orc_size % sizeof(struct orc_entry) != 0 ||
num_entries != orc_size / sizeof(struct orc_entry)) {
orc_warn("WARNING: Bad or missing .orc_unwind table. Disabling unwinder.\n");
return;
}
/*
* Note, the orc_unwind and orc_unwind_ip tables were already
* sorted at build time via the 'sorttable' tool.
* It's ready for binary search straight away, no need to sort it.
*/
/* Initialize the fast lookup table: */
lookup_num_blocks = orc_lookup_end - orc_lookup;
for (i = 0; i < lookup_num_blocks-1; i++) {
orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
num_entries, LOOKUP_START_IP + (LOOKUP_BLOCK_SIZE * i));
if (!orc) {
orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
return;
}
orc_lookup[i] = orc - __start_orc_unwind;
}
/* Initialize the ending block: */
orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind, num_entries, LOOKUP_STOP_IP);
if (!orc) {
orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
return;
}
orc_lookup[lookup_num_blocks-1] = orc - __start_orc_unwind;
orc_init = true;
}
static inline bool on_stack(struct stack_info *info, unsigned long addr, size_t len)
{
unsigned long begin = info->begin;
unsigned long end = info->end;
return (info->type != STACK_TYPE_UNKNOWN &&
addr >= begin && addr < end && addr + len > begin && addr + len <= end);
}
static bool stack_access_ok(struct unwind_state *state, unsigned long addr, size_t len)
{
struct stack_info *info = &state->stack_info;
if (on_stack(info, addr, len))
return true;
return !get_stack_info(addr, state->task, info) && on_stack(info, addr, len);
}
unsigned long unwind_get_return_address(struct unwind_state *state)
{
return __unwind_get_return_address(state);
}
EXPORT_SYMBOL_GPL(unwind_get_return_address);
void unwind_start(struct unwind_state *state, struct task_struct *task,
struct pt_regs *regs)
{
__unwind_start(state, task, regs);
state->type = UNWINDER_ORC;
if (!unwind_done(state) && !__kernel_text_address(state->pc))
unwind_next_frame(state);
}
EXPORT_SYMBOL_GPL(unwind_start);
static bool is_entry_func(unsigned long addr)
{
extern u32 kernel_entry;
extern u32 kernel_entry_end;
return addr >= (unsigned long)&kernel_entry && addr < (unsigned long)&kernel_entry_end;
}
static inline unsigned long bt_address(unsigned long ra)
{
extern unsigned long eentry;
if (__kernel_text_address(ra))
return ra;
if (__module_text_address(ra))
return ra;
if (ra >= eentry && ra < eentry + EXCCODE_INT_END * VECSIZE) {
unsigned long func;
unsigned long type = (ra - eentry) / VECSIZE;
unsigned long offset = (ra - eentry) % VECSIZE;
switch (type) {
case 0 ... EXCCODE_INT_START - 1:
func = (unsigned long)exception_table[type];
break;
case EXCCODE_INT_START ... EXCCODE_INT_END:
func = (unsigned long)handle_vint;
break;
default:
func = (unsigned long)handle_reserved;
break;
}
return func + offset;
}
return ra;
}
bool unwind_next_frame(struct unwind_state *state)
{
unsigned long *p, pc;
struct pt_regs *regs;
struct orc_entry *orc;
struct stack_info *info = &state->stack_info;
if (unwind_done(state))
return false;
/* Don't let modules unload while we're reading their ORC data. */
preempt_disable();
if (is_entry_func(state->pc))
goto end;
orc = orc_find(state->pc);
if (!orc) {
/*
* As a fallback, try to assume this code uses a frame pointer.
* This is useful for generated code, like BPF, which ORC
* doesn't know about. This is just a guess, so the rest of
* the unwind is no longer considered reliable.
*/
orc = &orc_fp_entry;
state->error = true;
} else {
if (orc->type == ORC_TYPE_UNDEFINED)
goto err;
if (orc->type == ORC_TYPE_END_OF_STACK)
goto end;
}
switch (orc->sp_reg) {
case ORC_REG_SP:
if (info->type == STACK_TYPE_IRQ && state->sp == info->end)
orc->type = ORC_TYPE_REGS;
else
state->sp = state->sp + orc->sp_offset;
break;
case ORC_REG_FP:
state->sp = state->fp;
break;
default:
orc_warn("unknown SP base reg %d at %pB\n", orc->sp_reg, (void *)state->pc);
goto err;
}
switch (orc->fp_reg) {
case ORC_REG_PREV_SP:
p = (unsigned long *)(state->sp + orc->fp_offset);
if (!stack_access_ok(state, (unsigned long)p, sizeof(unsigned long)))
goto err;
state->fp = *p;
break;
case ORC_REG_UNDEFINED:
/* Nothing. */
break;
default:
orc_warn("unknown FP base reg %d at %pB\n", orc->fp_reg, (void *)state->pc);
goto err;
}
switch (orc->type) {
case ORC_TYPE_CALL:
if (orc->ra_reg == ORC_REG_PREV_SP) {
p = (unsigned long *)(state->sp + orc->ra_offset);
if (!stack_access_ok(state, (unsigned long)p, sizeof(unsigned long)))
goto err;
pc = unwind_graph_addr(state, *p, state->sp);
pc -= LOONGARCH_INSN_SIZE;
} else if (orc->ra_reg == ORC_REG_UNDEFINED) {
if (!state->ra || state->ra == state->pc)
goto err;
pc = unwind_graph_addr(state, state->ra, state->sp);
pc -= LOONGARCH_INSN_SIZE;
state->ra = 0;
} else {
orc_warn("unknown ra base reg %d at %pB\n", orc->ra_reg, (void *)state->pc);
goto err;
}
break;
case ORC_TYPE_REGS:
if (info->type == STACK_TYPE_IRQ && state->sp == info->end)
regs = (struct pt_regs *)info->next_sp;
else
regs = (struct pt_regs *)state->sp;
if (!stack_access_ok(state, (unsigned long)regs, sizeof(*regs)))
goto err;
if ((info->end == (unsigned long)regs + sizeof(*regs)) &&
!regs->regs[3] && !regs->regs[1])
goto end;
if (user_mode(regs))
goto end;
pc = regs->csr_era;
if (!__kernel_text_address(pc))
goto err;
state->sp = regs->regs[3];
state->ra = regs->regs[1];
state->fp = regs->regs[22];
get_stack_info(state->sp, state->task, info);
break;
default:
orc_warn("unknown .orc_unwind entry type %d at %pB\n", orc->type, (void *)state->pc);
goto err;
}
state->pc = bt_address(pc);
if (!state->pc) {
pr_err("cannot find unwind pc at %pK\n", (void *)pc);
goto err;
}
if (!__kernel_text_address(state->pc))
goto err;
preempt_enable();
return true;
err:
state->error = true;
end:
preempt_enable();
state->stack_info.type = STACK_TYPE_UNKNOWN;
return false;
}
EXPORT_SYMBOL_GPL(unwind_next_frame);

3
arch/loongarch/kernel/vmlinux.lds.S
View File

@ -2,6 +2,7 @@
#include <linux/sizes.h> #include <linux/sizes.h>
#include <asm/asm-offsets.h> #include <asm/asm-offsets.h>
#include <asm/thread_info.h> #include <asm/thread_info.h>
#include <asm/orc_lookup.h>
#define PAGE_SIZE _PAGE_SIZE #define PAGE_SIZE _PAGE_SIZE
#define RO_EXCEPTION_TABLE_ALIGN 4 #define RO_EXCEPTION_TABLE_ALIGN 4
@ -123,6 +124,8 @@ SECTIONS
} }
#endif #endif
ORC_UNWIND_TABLE
.sdata : { .sdata : {
*(.sdata) *(.sdata)
} }

9
arch/loongarch/kvm/switch.S
View File

@ -8,7 +8,7 @@
#include <asm/asmmacro.h> #include <asm/asmmacro.h>
#include <asm/loongarch.h> #include <asm/loongarch.h>
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/stackframe.h> #include <asm/unwind_hints.h>
#define HGPR_OFFSET(x) (PT_R0 + 8*x) #define HGPR_OFFSET(x) (PT_R0 + 8*x)
#define GGPR_OFFSET(x) (KVM_ARCH_GGPR + 8*x) #define GGPR_OFFSET(x) (KVM_ARCH_GGPR + 8*x)
@ -112,6 +112,7 @@
.text .text
.cfi_sections .debug_frame .cfi_sections .debug_frame
SYM_CODE_START(kvm_exc_entry) SYM_CODE_START(kvm_exc_entry)
UNWIND_HINT_UNDEFINED
csrwr a2, KVM_TEMP_KS csrwr a2, KVM_TEMP_KS
csrrd a2, KVM_VCPU_KS csrrd a2, KVM_VCPU_KS
addi.d a2, a2, KVM_VCPU_ARCH addi.d a2, a2, KVM_VCPU_ARCH
@ -273,3 +274,9 @@ SYM_FUNC_END(kvm_restore_lasx)
.section ".rodata" .section ".rodata"
SYM_DATA(kvm_exception_size, .quad kvm_exc_entry_end - kvm_exc_entry) SYM_DATA(kvm_exception_size, .quad kvm_exc_entry_end - kvm_exc_entry)
SYM_DATA(kvm_enter_guest_size, .quad kvm_enter_guest_end - kvm_enter_guest) SYM_DATA(kvm_enter_guest_size, .quad kvm_enter_guest_end - kvm_enter_guest)
#ifdef CONFIG_CPU_HAS_LBT
STACK_FRAME_NON_STANDARD kvm_restore_fpu
STACK_FRAME_NON_STANDARD kvm_restore_lsx
STACK_FRAME_NON_STANDARD kvm_restore_lasx
#endif

3
arch/loongarch/lib/clear_user.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-extable.h> #include <asm/asm-extable.h>
#include <asm/cpu.h> #include <asm/cpu.h>
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/unwind_hints.h>
SYM_FUNC_START(__clear_user) SYM_FUNC_START(__clear_user)
/* /*
@ -204,3 +205,5 @@ SYM_FUNC_START(__clear_user_fast)
_asm_extable 28b, .Lsmall_fixup _asm_extable 28b, .Lsmall_fixup
_asm_extable 29b, .Lexit _asm_extable 29b, .Lexit
SYM_FUNC_END(__clear_user_fast) SYM_FUNC_END(__clear_user_fast)
STACK_FRAME_NON_STANDARD __clear_user_fast

3
arch/loongarch/lib/copy_user.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-extable.h> #include <asm/asm-extable.h>
#include <asm/cpu.h> #include <asm/cpu.h>
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/unwind_hints.h>
SYM_FUNC_START(__copy_user) SYM_FUNC_START(__copy_user)
/* /*
@ -278,3 +279,5 @@ SYM_FUNC_START(__copy_user_fast)
_asm_extable 58b, .Lexit _asm_extable 58b, .Lexit
_asm_extable 59b, .Lexit _asm_extable 59b, .Lexit
SYM_FUNC_END(__copy_user_fast) SYM_FUNC_END(__copy_user_fast)
STACK_FRAME_NON_STANDARD __copy_user_fast

3
arch/loongarch/lib/memcpy.S
View File

@ -9,6 +9,7 @@
#include <asm/asmmacro.h> #include <asm/asmmacro.h>
#include <asm/cpu.h> #include <asm/cpu.h>
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/unwind_hints.h>
.section .noinstr.text, "ax" .section .noinstr.text, "ax"
@ -197,3 +198,5 @@ SYM_FUNC_START(__memcpy_fast)
jr ra jr ra
SYM_FUNC_END(__memcpy_fast) SYM_FUNC_END(__memcpy_fast)
_ASM_NOKPROBE(__memcpy_fast) _ASM_NOKPROBE(__memcpy_fast)
STACK_FRAME_NON_STANDARD __memcpy_small

3
arch/loongarch/lib/memset.S
View File

@ -9,6 +9,7 @@
#include <asm/asmmacro.h> #include <asm/asmmacro.h>
#include <asm/cpu.h> #include <asm/cpu.h>
#include <asm/regdef.h> #include <asm/regdef.h>
#include <asm/unwind_hints.h>
.macro fill_to_64 r0 .macro fill_to_64 r0
bstrins.d \r0, \r0, 15, 8 bstrins.d \r0, \r0, 15, 8
@ -166,3 +167,5 @@ SYM_FUNC_START(__memset_fast)
jr ra jr ra
SYM_FUNC_END(__memset_fast) SYM_FUNC_END(__memset_fast)
_ASM_NOKPROBE(__memset_fast) _ASM_NOKPROBE(__memset_fast)
STACK_FRAME_NON_STANDARD __memset_fast

27
arch/loongarch/mm/tlb.c
View File

@ -9,8 +9,9 @@
#include <linux/hugetlb.h> #include <linux/hugetlb.h>
#include <linux/export.h> #include <linux/export.h>
#include <asm/cpu.h>
#include <asm/bootinfo.h> #include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/exception.h>
#include <asm/mmu_context.h> #include <asm/mmu_context.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
#include <asm/tlb.h> #include <asm/tlb.h>
@ -266,24 +267,20 @@ static void setup_tlb_handler(int cpu)
setup_ptwalker(); setup_ptwalker();
local_flush_tlb_all(); local_flush_tlb_all();
if (cpu_has_ptw) {
exception_table[EXCCODE_TLBI] = handle_tlb_load_ptw;
exception_table[EXCCODE_TLBL] = handle_tlb_load_ptw;
exception_table[EXCCODE_TLBS] = handle_tlb_store_ptw;
exception_table[EXCCODE_TLBM] = handle_tlb_modify_ptw;
}
/* The tlb handlers are generated only once */ /* The tlb handlers are generated only once */
if (cpu == 0) { if (cpu == 0) {
memcpy((void *)tlbrentry, handle_tlb_refill, 0x80); memcpy((void *)tlbrentry, handle_tlb_refill, 0x80);
local_flush_icache_range(tlbrentry, tlbrentry + 0x80); local_flush_icache_range(tlbrentry, tlbrentry + 0x80);
if (!cpu_has_ptw) {
set_handler(EXCCODE_TLBI * VECSIZE, handle_tlb_load, VECSIZE); for (int i = EXCCODE_TLBL; i <= EXCCODE_TLBPE; i++)
set_handler(EXCCODE_TLBL * VECSIZE, handle_tlb_load, VECSIZE); set_handler(i * VECSIZE, exception_table[i], VECSIZE);
set_handler(EXCCODE_TLBS * VECSIZE, handle_tlb_store, VECSIZE);
set_handler(EXCCODE_TLBM * VECSIZE, handle_tlb_modify, VECSIZE);
} else {
set_handler(EXCCODE_TLBI * VECSIZE, handle_tlb_load_ptw, VECSIZE);
set_handler(EXCCODE_TLBL * VECSIZE, handle_tlb_load_ptw, VECSIZE);
set_handler(EXCCODE_TLBS * VECSIZE, handle_tlb_store_ptw, VECSIZE);
set_handler(EXCCODE_TLBM * VECSIZE, handle_tlb_modify_ptw, VECSIZE);
}
set_handler(EXCCODE_TLBNR * VECSIZE, handle_tlb_protect, VECSIZE);
set_handler(EXCCODE_TLBNX * VECSIZE, handle_tlb_protect, VECSIZE);
set_handler(EXCCODE_TLBPE * VECSIZE, handle_tlb_protect, VECSIZE);
} else { } else {
int vec_sz __maybe_unused; int vec_sz __maybe_unused;
void *addr __maybe_unused; void *addr __maybe_unused;

9
arch/loongarch/mm/tlbex.S
View File

@ -18,6 +18,7 @@
.macro tlb_do_page_fault, write .macro tlb_do_page_fault, write
SYM_CODE_START(tlb_do_page_fault_\write) SYM_CODE_START(tlb_do_page_fault_\write)
UNWIND_HINT_UNDEFINED
SAVE_ALL SAVE_ALL
csrrd a2, LOONGARCH_CSR_BADV csrrd a2, LOONGARCH_CSR_BADV
move a0, sp move a0, sp
@ -32,6 +33,7 @@
tlb_do_page_fault 1 tlb_do_page_fault 1
SYM_CODE_START(handle_tlb_protect) SYM_CODE_START(handle_tlb_protect)
UNWIND_HINT_UNDEFINED
BACKUP_T0T1 BACKUP_T0T1
SAVE_ALL SAVE_ALL
move a0, sp move a0, sp
@ -44,6 +46,7 @@ SYM_CODE_START(handle_tlb_protect)
SYM_CODE_END(handle_tlb_protect) SYM_CODE_END(handle_tlb_protect)
SYM_CODE_START(handle_tlb_load) SYM_CODE_START(handle_tlb_load)
UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0 csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1 csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2 csrwr ra, EXCEPTION_KS2
@ -190,6 +193,7 @@ nopage_tlb_load:
SYM_CODE_END(handle_tlb_load) SYM_CODE_END(handle_tlb_load)
SYM_CODE_START(handle_tlb_load_ptw) SYM_CODE_START(handle_tlb_load_ptw)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0 csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1 csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_0 la_abs t0, tlb_do_page_fault_0
@ -197,6 +201,7 @@ SYM_CODE_START(handle_tlb_load_ptw)
SYM_CODE_END(handle_tlb_load_ptw) SYM_CODE_END(handle_tlb_load_ptw)
SYM_CODE_START(handle_tlb_store) SYM_CODE_START(handle_tlb_store)
UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0 csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1 csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2 csrwr ra, EXCEPTION_KS2
@ -346,6 +351,7 @@ nopage_tlb_store:
SYM_CODE_END(handle_tlb_store) SYM_CODE_END(handle_tlb_store)
SYM_CODE_START(handle_tlb_store_ptw) SYM_CODE_START(handle_tlb_store_ptw)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0 csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1 csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_1 la_abs t0, tlb_do_page_fault_1
@ -353,6 +359,7 @@ SYM_CODE_START(handle_tlb_store_ptw)
SYM_CODE_END(handle_tlb_store_ptw) SYM_CODE_END(handle_tlb_store_ptw)
SYM_CODE_START(handle_tlb_modify) SYM_CODE_START(handle_tlb_modify)
UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0 csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1 csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2 csrwr ra, EXCEPTION_KS2
@ -500,6 +507,7 @@ nopage_tlb_modify:
SYM_CODE_END(handle_tlb_modify) SYM_CODE_END(handle_tlb_modify)
SYM_CODE_START(handle_tlb_modify_ptw) SYM_CODE_START(handle_tlb_modify_ptw)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0 csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1 csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_1 la_abs t0, tlb_do_page_fault_1
@ -507,6 +515,7 @@ SYM_CODE_START(handle_tlb_modify_ptw)
SYM_CODE_END(handle_tlb_modify_ptw) SYM_CODE_END(handle_tlb_modify_ptw)
SYM_CODE_START(handle_tlb_refill) SYM_CODE_START(handle_tlb_refill)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_TLBRSAVE csrwr t0, LOONGARCH_CSR_TLBRSAVE
csrrd t0, LOONGARCH_CSR_PGD csrrd t0, LOONGARCH_CSR_PGD
lddir t0, t0, 3 lddir t0, t0, 3

1
arch/loongarch/vdso/Makefile
View File

@ -4,6 +4,7 @@
KASAN_SANITIZE := n KASAN_SANITIZE := n
UBSAN_SANITIZE := n UBSAN_SANITIZE := n
KCOV_INSTRUMENT := n KCOV_INSTRUMENT := n
OBJECT_FILES_NON_STANDARD := y
# Include the generic Makefile to check the built vdso. # Include the generic Makefile to check the built vdso.
include $(srctree)/lib/vdso/Makefile include $(srctree)/lib/vdso/Makefile

9
include/linux/compiler.h
View File

@ -116,6 +116,14 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
*/ */
#define __stringify_label(n) #n #define __stringify_label(n) #n
#define __annotate_reachable(c) ({ \
asm volatile(__stringify_label(c) ":\n\t" \
".pushsection .discard.reachable\n\t" \
".long " __stringify_label(c) "b - .\n\t" \
".popsection\n\t"); \
})
#define annotate_reachable() __annotate_reachable(__COUNTER__)
#define __annotate_unreachable(c) ({ \ #define __annotate_unreachable(c) ({ \
asm volatile(__stringify_label(c) ":\n\t" \ asm volatile(__stringify_label(c) ":\n\t" \
".pushsection .discard.unreachable\n\t" \ ".pushsection .discard.unreachable\n\t" \
@ -128,6 +136,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#define __annotate_jump_table __section(".rodata..c_jump_table") #define __annotate_jump_table __section(".rodata..c_jump_table")
#else /* !CONFIG_OBJTOOL */ #else /* !CONFIG_OBJTOOL */
#define annotate_reachable()
#define annotate_unreachable() #define annotate_unreachable()
#define __annotate_jump_table #define __annotate_jump_table
#endif /* CONFIG_OBJTOOL */ #endif /* CONFIG_OBJTOOL */

7
scripts/Makefile
View File

@ -31,9 +31,12 @@ HOSTLDLIBS_sign-file = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null |
ifdef CONFIG_UNWINDER_ORC ifdef CONFIG_UNWINDER_ORC
ifeq ($(ARCH),x86_64) ifeq ($(ARCH),x86_64)
ARCH := x86 SRCARCH := x86
endif endif
HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/x86/include ifeq ($(ARCH),loongarch)
SRCARCH := loongarch
endif
HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/$(SRCARCH)/include
HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
endif endif