//===--------------------- Unwind_AppleExtras.cpp -------------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // // //===----------------------------------------------------------------------===// #include "config.h" #include "AddressSpace.hpp" #include "DwarfParser.hpp" // 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 defined(__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 defined(__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 defined(_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 // defined(_LIBUNWIND_BUILD_ZERO_COST_APIS) #if defined(_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 // defined(_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::FDE_Info fdeInfo; CFI_Parser::CIE_Info cieInfo; const char *msg = CFI_Parser::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; } }