Unwind_AppleExtras.cpp revision 355940
1//===--------------------- Unwind_AppleExtras.cpp -------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7// 8//===----------------------------------------------------------------------===// 9 10#include "config.h" 11#include "AddressSpace.hpp" 12#include "DwarfParser.hpp" 13 14 15// private keymgr stuff 16#define KEYMGR_GCC3_DW2_OBJ_LIST 302 17extern "C" { 18 extern void _keymgr_set_and_unlock_processwide_ptr(int key, void *ptr); 19 extern void *_keymgr_get_and_lock_processwide_ptr(int key); 20} 21 22// undocumented libgcc "struct object" 23struct libgcc_object { 24 void *start; 25 void *unused1; 26 void *unused2; 27 void *fde; 28 unsigned long encoding; 29 void *fde_end; 30 libgcc_object *next; 31}; 32 33// undocumented libgcc "struct km_object_info" referenced by 34// KEYMGR_GCC3_DW2_OBJ_LIST 35struct libgcc_object_info { 36 libgcc_object *seen_objects; 37 libgcc_object *unseen_objects; 38 unsigned spare[2]; 39}; 40 41 42// static linker symbols to prevent wrong two level namespace for _Unwind symbols 43#if defined(__arm__) 44 #define NOT_HERE_BEFORE_5_0(sym) \ 45 extern const char sym##_tmp30 __asm("$ld$hide$os3.0$_" #sym ); \ 46 __attribute__((visibility("default"))) const char sym##_tmp30 = 0; \ 47 extern const char sym##_tmp31 __asm("$ld$hide$os3.1$_" #sym ); \ 48 __attribute__((visibility("default"))) const char sym##_tmp31 = 0; \ 49 extern const char sym##_tmp32 __asm("$ld$hide$os3.2$_" #sym );\ 50 __attribute__((visibility("default"))) const char sym##_tmp32 = 0; \ 51 extern const char sym##_tmp40 __asm("$ld$hide$os4.0$_" #sym ); \ 52 __attribute__((visibility("default"))) const char sym##_tmp40 = 0; \ 53 extern const char sym##_tmp41 __asm("$ld$hide$os4.1$_" #sym ); \ 54 __attribute__((visibility("default"))) const char sym##_tmp41 = 0; \ 55 extern const char sym##_tmp42 __asm("$ld$hide$os4.2$_" #sym ); \ 56 __attribute__((visibility("default"))) const char sym##_tmp42 = 0; \ 57 extern const char sym##_tmp43 __asm("$ld$hide$os4.3$_" #sym ); \ 58 __attribute__((visibility("default"))) const char sym##_tmp43 = 0; 59#elif defined(__arm64__) 60 #define NOT_HERE_BEFORE_10_6(sym) 61 #define NEVER_HERE(sym) 62#else 63 #define NOT_HERE_BEFORE_10_6(sym) \ 64 extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \ 65 __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \ 66 extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \ 67 __attribute__((visibility("default"))) const char sym##_tmp5 = 0; 68 #define NEVER_HERE(sym) \ 69 extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \ 70 __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \ 71 extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \ 72 __attribute__((visibility("default"))) const char sym##_tmp5 = 0; \ 73 extern const char sym##_tmp6 __asm("$ld$hide$os10.6$_" #sym ); \ 74 __attribute__((visibility("default"))) const char sym##_tmp6 = 0; 75#endif 76 77 78#if defined(_LIBUNWIND_BUILD_ZERO_COST_APIS) 79 80// 81// symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in 82// earlier versions 83// 84NOT_HERE_BEFORE_10_6(_Unwind_DeleteException) 85NOT_HERE_BEFORE_10_6(_Unwind_Find_FDE) 86NOT_HERE_BEFORE_10_6(_Unwind_ForcedUnwind) 87NOT_HERE_BEFORE_10_6(_Unwind_GetGR) 88NOT_HERE_BEFORE_10_6(_Unwind_GetIP) 89NOT_HERE_BEFORE_10_6(_Unwind_GetLanguageSpecificData) 90NOT_HERE_BEFORE_10_6(_Unwind_GetRegionStart) 91NOT_HERE_BEFORE_10_6(_Unwind_RaiseException) 92NOT_HERE_BEFORE_10_6(_Unwind_Resume) 93NOT_HERE_BEFORE_10_6(_Unwind_SetGR) 94NOT_HERE_BEFORE_10_6(_Unwind_SetIP) 95NOT_HERE_BEFORE_10_6(_Unwind_Backtrace) 96NOT_HERE_BEFORE_10_6(_Unwind_FindEnclosingFunction) 97NOT_HERE_BEFORE_10_6(_Unwind_GetCFA) 98NOT_HERE_BEFORE_10_6(_Unwind_GetDataRelBase) 99NOT_HERE_BEFORE_10_6(_Unwind_GetTextRelBase) 100NOT_HERE_BEFORE_10_6(_Unwind_Resume_or_Rethrow) 101NOT_HERE_BEFORE_10_6(_Unwind_GetIPInfo) 102NOT_HERE_BEFORE_10_6(__register_frame) 103NOT_HERE_BEFORE_10_6(__deregister_frame) 104 105// 106// symbols in libSystem.dylib for compatibility, but we don't want any new code 107// using them 108// 109NEVER_HERE(__register_frame_info_bases) 110NEVER_HERE(__register_frame_info) 111NEVER_HERE(__register_frame_info_table_bases) 112NEVER_HERE(__register_frame_info_table) 113NEVER_HERE(__register_frame_table) 114NEVER_HERE(__deregister_frame_info) 115NEVER_HERE(__deregister_frame_info_bases) 116 117#endif // defined(_LIBUNWIND_BUILD_ZERO_COST_APIS) 118 119 120 121 122#if defined(_LIBUNWIND_BUILD_SJLJ_APIS) 123// 124// symbols in libSystem.dylib in iOS 5.0 and later, but are in libgcc_s.dylib in 125// earlier versions 126// 127NOT_HERE_BEFORE_5_0(_Unwind_GetLanguageSpecificData) 128NOT_HERE_BEFORE_5_0(_Unwind_GetRegionStart) 129NOT_HERE_BEFORE_5_0(_Unwind_GetIP) 130NOT_HERE_BEFORE_5_0(_Unwind_SetGR) 131NOT_HERE_BEFORE_5_0(_Unwind_SetIP) 132NOT_HERE_BEFORE_5_0(_Unwind_DeleteException) 133NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Register) 134NOT_HERE_BEFORE_5_0(_Unwind_GetGR) 135NOT_HERE_BEFORE_5_0(_Unwind_GetIPInfo) 136NOT_HERE_BEFORE_5_0(_Unwind_GetCFA) 137NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume) 138NOT_HERE_BEFORE_5_0(_Unwind_SjLj_RaiseException) 139NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume_or_Rethrow) 140NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Unregister) 141 142#endif // defined(_LIBUNWIND_BUILD_SJLJ_APIS) 143 144 145namespace libunwind { 146 147_LIBUNWIND_HIDDEN 148bool checkKeyMgrRegisteredFDEs(uintptr_t pc, void *&fde) { 149#if __MAC_OS_X_VERSION_MIN_REQUIRED 150 // lastly check for old style keymgr registration of dynamically generated 151 // FDEs acquire exclusive access to libgcc_object_info 152 libgcc_object_info *head = (libgcc_object_info *) 153 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST); 154 if (head != NULL) { 155 // look at each FDE in keymgr 156 for (libgcc_object *ob = head->unseen_objects; ob != NULL; ob = ob->next) { 157 CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; 158 CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; 159 const char *msg = CFI_Parser<LocalAddressSpace>::decodeFDE( 160 LocalAddressSpace::sThisAddressSpace, 161 (uintptr_t)ob->fde, &fdeInfo, &cieInfo); 162 if (msg == NULL) { 163 // Check if this FDE is for a function that includes the pc 164 if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) { 165 fde = (void*)fdeInfo.pcStart; 166 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, 167 head); 168 return true; 169 } 170 } 171 } 172 } 173 // release libgcc_object_info 174 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, head); 175#else 176 (void)pc; 177 (void)fde; 178#endif 179 return false; 180} 181 182} 183 184