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