1288149Semaste//===--------------------- Unwind_AppleExtras.cpp -------------------------===// 2288149Semaste// 3353358Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4353358Sdim// See https://llvm.org/LICENSE.txt for license information. 5353358Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6288149Semaste// 7288149Semaste// 8288149Semaste//===----------------------------------------------------------------------===// 9288149Semaste 10288149Semaste#include "config.h" 11345018Sdim#include "AddressSpace.hpp" 12288149Semaste#include "DwarfParser.hpp" 13288149Semaste 14288149Semaste 15288149Semaste// private keymgr stuff 16288149Semaste#define KEYMGR_GCC3_DW2_OBJ_LIST 302 17288149Semasteextern "C" { 18288149Semaste extern void _keymgr_set_and_unlock_processwide_ptr(int key, void *ptr); 19288149Semaste extern void *_keymgr_get_and_lock_processwide_ptr(int key); 20288149Semaste} 21288149Semaste 22288149Semaste// undocumented libgcc "struct object" 23288149Semastestruct libgcc_object { 24288149Semaste void *start; 25288149Semaste void *unused1; 26288149Semaste void *unused2; 27288149Semaste void *fde; 28288149Semaste unsigned long encoding; 29288149Semaste void *fde_end; 30288149Semaste libgcc_object *next; 31288149Semaste}; 32288149Semaste 33288149Semaste// undocumented libgcc "struct km_object_info" referenced by 34288149Semaste// KEYMGR_GCC3_DW2_OBJ_LIST 35288149Semastestruct libgcc_object_info { 36288149Semaste libgcc_object *seen_objects; 37288149Semaste libgcc_object *unseen_objects; 38288149Semaste unsigned spare[2]; 39288149Semaste}; 40288149Semaste 41288149Semaste 42288149Semaste// static linker symbols to prevent wrong two level namespace for _Unwind symbols 43288149Semaste#if defined(__arm__) 44288149Semaste #define NOT_HERE_BEFORE_5_0(sym) \ 45288149Semaste extern const char sym##_tmp30 __asm("$ld$hide$os3.0$_" #sym ); \ 46288149Semaste __attribute__((visibility("default"))) const char sym##_tmp30 = 0; \ 47288149Semaste extern const char sym##_tmp31 __asm("$ld$hide$os3.1$_" #sym ); \ 48288149Semaste __attribute__((visibility("default"))) const char sym##_tmp31 = 0; \ 49288149Semaste extern const char sym##_tmp32 __asm("$ld$hide$os3.2$_" #sym );\ 50288149Semaste __attribute__((visibility("default"))) const char sym##_tmp32 = 0; \ 51288149Semaste extern const char sym##_tmp40 __asm("$ld$hide$os4.0$_" #sym ); \ 52288149Semaste __attribute__((visibility("default"))) const char sym##_tmp40 = 0; \ 53288149Semaste extern const char sym##_tmp41 __asm("$ld$hide$os4.1$_" #sym ); \ 54288149Semaste __attribute__((visibility("default"))) const char sym##_tmp41 = 0; \ 55288149Semaste extern const char sym##_tmp42 __asm("$ld$hide$os4.2$_" #sym ); \ 56288149Semaste __attribute__((visibility("default"))) const char sym##_tmp42 = 0; \ 57288149Semaste extern const char sym##_tmp43 __asm("$ld$hide$os4.3$_" #sym ); \ 58288149Semaste __attribute__((visibility("default"))) const char sym##_tmp43 = 0; 59288149Semaste#elif defined(__arm64__) 60288149Semaste #define NOT_HERE_BEFORE_10_6(sym) 61288149Semaste #define NEVER_HERE(sym) 62288149Semaste#else 63288149Semaste #define NOT_HERE_BEFORE_10_6(sym) \ 64288149Semaste extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \ 65288149Semaste __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \ 66288149Semaste extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \ 67288149Semaste __attribute__((visibility("default"))) const char sym##_tmp5 = 0; 68288149Semaste #define NEVER_HERE(sym) \ 69288149Semaste extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \ 70288149Semaste __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \ 71288149Semaste extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \ 72288149Semaste __attribute__((visibility("default"))) const char sym##_tmp5 = 0; \ 73288149Semaste extern const char sym##_tmp6 __asm("$ld$hide$os10.6$_" #sym ); \ 74288149Semaste __attribute__((visibility("default"))) const char sym##_tmp6 = 0; 75288149Semaste#endif 76288149Semaste 77288149Semaste 78345018Sdim#if defined(_LIBUNWIND_BUILD_ZERO_COST_APIS) 79288149Semaste 80288149Semaste// 81288149Semaste// symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in 82288149Semaste// earlier versions 83288149Semaste// 84288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_DeleteException) 85288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_Find_FDE) 86288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_ForcedUnwind) 87288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetGR) 88288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetIP) 89288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetLanguageSpecificData) 90288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetRegionStart) 91288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_RaiseException) 92288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_Resume) 93288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_SetGR) 94288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_SetIP) 95288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_Backtrace) 96288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_FindEnclosingFunction) 97288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetCFA) 98288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetDataRelBase) 99288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetTextRelBase) 100288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_Resume_or_Rethrow) 101288149SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetIPInfo) 102288149SemasteNOT_HERE_BEFORE_10_6(__register_frame) 103288149SemasteNOT_HERE_BEFORE_10_6(__deregister_frame) 104288149Semaste 105288149Semaste// 106288149Semaste// symbols in libSystem.dylib for compatibility, but we don't want any new code 107288149Semaste// using them 108288149Semaste// 109288149SemasteNEVER_HERE(__register_frame_info_bases) 110288149SemasteNEVER_HERE(__register_frame_info) 111288149SemasteNEVER_HERE(__register_frame_info_table_bases) 112288149SemasteNEVER_HERE(__register_frame_info_table) 113288149SemasteNEVER_HERE(__register_frame_table) 114288149SemasteNEVER_HERE(__deregister_frame_info) 115288149SemasteNEVER_HERE(__deregister_frame_info_bases) 116288149Semaste 117345018Sdim#endif // defined(_LIBUNWIND_BUILD_ZERO_COST_APIS) 118288149Semaste 119288149Semaste 120288149Semaste 121288149Semaste 122345018Sdim#if defined(_LIBUNWIND_BUILD_SJLJ_APIS) 123288149Semaste// 124288149Semaste// symbols in libSystem.dylib in iOS 5.0 and later, but are in libgcc_s.dylib in 125288149Semaste// earlier versions 126288149Semaste// 127288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetLanguageSpecificData) 128288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetRegionStart) 129288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetIP) 130288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_SetGR) 131288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_SetIP) 132288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_DeleteException) 133288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Register) 134288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetGR) 135288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetIPInfo) 136288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetCFA) 137288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume) 138288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_RaiseException) 139288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume_or_Rethrow) 140288149SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Unregister) 141288149Semaste 142345018Sdim#endif // defined(_LIBUNWIND_BUILD_SJLJ_APIS) 143288149Semaste 144288149Semaste 145288149Semastenamespace libunwind { 146288149Semaste 147288149Semaste_LIBUNWIND_HIDDEN 148288149Semastebool checkKeyMgrRegisteredFDEs(uintptr_t pc, void *&fde) { 149288149Semaste#if __MAC_OS_X_VERSION_MIN_REQUIRED 150288149Semaste // lastly check for old style keymgr registration of dynamically generated 151288149Semaste // FDEs acquire exclusive access to libgcc_object_info 152288149Semaste libgcc_object_info *head = (libgcc_object_info *) 153288149Semaste _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST); 154288149Semaste if (head != NULL) { 155288149Semaste // look at each FDE in keymgr 156288149Semaste for (libgcc_object *ob = head->unseen_objects; ob != NULL; ob = ob->next) { 157288149Semaste CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; 158288149Semaste CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; 159288149Semaste const char *msg = CFI_Parser<LocalAddressSpace>::decodeFDE( 160288149Semaste LocalAddressSpace::sThisAddressSpace, 161288149Semaste (uintptr_t)ob->fde, &fdeInfo, &cieInfo); 162288149Semaste if (msg == NULL) { 163288149Semaste // Check if this FDE is for a function that includes the pc 164288149Semaste if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) { 165288149Semaste fde = (void*)fdeInfo.pcStart; 166288149Semaste _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, 167288149Semaste head); 168288149Semaste return true; 169288149Semaste } 170288149Semaste } 171288149Semaste } 172288149Semaste } 173288149Semaste // release libgcc_object_info 174288149Semaste _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, head); 175288149Semaste#else 176288149Semaste (void)pc; 177288149Semaste (void)fde; 178288149Semaste#endif 179288149Semaste return false; 180288149Semaste} 181288149Semaste 182288149Semaste} 183288149Semaste 184