| //===--------------------- 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 && _LIBUNWIND_BUILD_SJLJ_APIS |
| |
| #include <System/pthread_machdep.h> |
| |
| // Accessors to get get/set linked list of frames for sjlj based execeptions. |
| _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 |
| |
| |
| |
| |
