Unwind_AppleExtras.cpp revision 288149
1263363Semaste//===--------------------- Unwind_AppleExtras.cpp -------------------------===// 2254721Semaste// 3254721Semaste// The LLVM Compiler Infrastructure 4254721Semaste// 5254721Semaste// This file is dual licensed under the MIT and the University of Illinois Open 6254721Semaste// Source Licenses. See LICENSE.TXT for details. 7254721Semaste// 8254721Semaste// 9254721Semaste//===----------------------------------------------------------------------===// 10254721Semaste 11254721Semaste#include "config.h" 12254721Semaste#include "DwarfParser.hpp" 13263363Semaste#include "unwind_ext.h" 14263363Semaste 15263363Semaste 16263363Semaste// private keymgr stuff 17263363Semaste#define KEYMGR_GCC3_DW2_OBJ_LIST 302 18263363Semasteextern "C" { 19263363Semaste extern void _keymgr_set_and_unlock_processwide_ptr(int key, void *ptr); 20263363Semaste extern void *_keymgr_get_and_lock_processwide_ptr(int key); 21263363Semaste} 22263363Semaste 23263363Semaste// undocumented libgcc "struct object" 24263363Semastestruct libgcc_object { 25263363Semaste void *start; 26263363Semaste void *unused1; 27263363Semaste void *unused2; 28263363Semaste void *fde; 29254721Semaste unsigned long encoding; 30254721Semaste void *fde_end; 31263363Semaste libgcc_object *next; 32263363Semaste}; 33263363Semaste 34263363Semaste// undocumented libgcc "struct km_object_info" referenced by 35263363Semaste// KEYMGR_GCC3_DW2_OBJ_LIST 36263363Semastestruct libgcc_object_info { 37263363Semaste libgcc_object *seen_objects; 38263363Semaste libgcc_object *unseen_objects; 39263363Semaste unsigned spare[2]; 40263363Semaste}; 41263363Semaste 42263363Semaste 43263363Semaste// static linker symbols to prevent wrong two level namespace for _Unwind symbols 44263363Semaste#if defined(__arm__) 45263363Semaste #define NOT_HERE_BEFORE_5_0(sym) \ 46263363Semaste extern const char sym##_tmp30 __asm("$ld$hide$os3.0$_" #sym ); \ 47263363Semaste __attribute__((visibility("default"))) const char sym##_tmp30 = 0; \ 48263363Semaste extern const char sym##_tmp31 __asm("$ld$hide$os3.1$_" #sym ); \ 49263363Semaste __attribute__((visibility("default"))) const char sym##_tmp31 = 0; \ 50263363Semaste extern const char sym##_tmp32 __asm("$ld$hide$os3.2$_" #sym );\ 51263363Semaste __attribute__((visibility("default"))) const char sym##_tmp32 = 0; \ 52263363Semaste extern const char sym##_tmp40 __asm("$ld$hide$os4.0$_" #sym ); \ 53263363Semaste __attribute__((visibility("default"))) const char sym##_tmp40 = 0; \ 54263363Semaste extern const char sym##_tmp41 __asm("$ld$hide$os4.1$_" #sym ); \ 55263363Semaste __attribute__((visibility("default"))) const char sym##_tmp41 = 0; \ 56263363Semaste extern const char sym##_tmp42 __asm("$ld$hide$os4.2$_" #sym ); \ 57263363Semaste __attribute__((visibility("default"))) const char sym##_tmp42 = 0; \ 58263363Semaste extern const char sym##_tmp43 __asm("$ld$hide$os4.3$_" #sym ); \ 59263363Semaste __attribute__((visibility("default"))) const char sym##_tmp43 = 0; 60263363Semaste#elif defined(__arm64__) 61263363Semaste #define NOT_HERE_BEFORE_10_6(sym) 62263363Semaste #define NEVER_HERE(sym) 63263363Semaste#else 64263363Semaste #define NOT_HERE_BEFORE_10_6(sym) \ 65263363Semaste extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \ 66263363Semaste __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \ 67254721Semaste extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \ 68254721Semaste __attribute__((visibility("default"))) const char sym##_tmp5 = 0; 69263363Semaste #define NEVER_HERE(sym) \ 70263363Semaste extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \ 71254721Semaste __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \ 72254721Semaste extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \ 73263363Semaste __attribute__((visibility("default"))) const char sym##_tmp5 = 0; \ 74263363Semaste extern const char sym##_tmp6 __asm("$ld$hide$os10.6$_" #sym ); \ 75263363Semaste __attribute__((visibility("default"))) const char sym##_tmp6 = 0; 76263363Semaste#endif 77263363Semaste 78263363Semaste 79263363Semaste#if _LIBUNWIND_BUILD_ZERO_COST_APIS 80263363Semaste 81263363Semaste// 82263363Semaste// symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in 83263363Semaste// earlier versions 84263363Semaste// 85263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_DeleteException) 86263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_Find_FDE) 87263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_ForcedUnwind) 88263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetGR) 89263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetIP) 90263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetLanguageSpecificData) 91263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetRegionStart) 92263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_RaiseException) 93263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_Resume) 94263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_SetGR) 95263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_SetIP) 96263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_Backtrace) 97263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_FindEnclosingFunction) 98263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetCFA) 99263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetDataRelBase) 100263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetTextRelBase) 101263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_Resume_or_Rethrow) 102263363SemasteNOT_HERE_BEFORE_10_6(_Unwind_GetIPInfo) 103263363SemasteNOT_HERE_BEFORE_10_6(__register_frame) 104263363SemasteNOT_HERE_BEFORE_10_6(__deregister_frame) 105263363Semaste 106263363Semaste// 107263363Semaste// symbols in libSystem.dylib for compatibility, but we don't want any new code 108263363Semaste// using them 109263363Semaste// 110263363SemasteNEVER_HERE(__register_frame_info_bases) 111263363SemasteNEVER_HERE(__register_frame_info) 112263363SemasteNEVER_HERE(__register_frame_info_table_bases) 113263363SemasteNEVER_HERE(__register_frame_info_table) 114263363SemasteNEVER_HERE(__register_frame_table) 115263363SemasteNEVER_HERE(__deregister_frame_info) 116263363SemasteNEVER_HERE(__deregister_frame_info_bases) 117263363Semaste 118263363Semaste#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS 119263363Semaste 120263363Semaste 121263363Semaste 122263363Semaste 123254721Semaste#if _LIBUNWIND_BUILD_SJLJ_APIS 124254721Semaste// 125263363Semaste// symbols in libSystem.dylib in iOS 5.0 and later, but are in libgcc_s.dylib in 126263363Semaste// earlier versions 127263363Semaste// 128254721SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetLanguageSpecificData) 129254721SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetRegionStart) 130263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetIP) 131263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_SetGR) 132263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_SetIP) 133263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_DeleteException) 134263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Register) 135263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetGR) 136263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetIPInfo) 137263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_GetCFA) 138263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume) 139263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_RaiseException) 140263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume_or_Rethrow) 141263363SemasteNOT_HERE_BEFORE_5_0(_Unwind_SjLj_Unregister) 142263363Semaste 143263363Semaste#endif // _LIBUNWIND_BUILD_SJLJ_APIS 144263363Semaste 145263363Semaste 146263363Semastenamespace libunwind { 147263363Semaste 148263363Semaste_LIBUNWIND_HIDDEN 149263363Semastebool checkKeyMgrRegisteredFDEs(uintptr_t pc, void *&fde) { 150263363Semaste#if __MAC_OS_X_VERSION_MIN_REQUIRED 151263363Semaste // lastly check for old style keymgr registration of dynamically generated 152263363Semaste // FDEs acquire exclusive access to libgcc_object_info 153263363Semaste libgcc_object_info *head = (libgcc_object_info *) 154263363Semaste _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST); 155263363Semaste if (head != NULL) { 156263363Semaste // look at each FDE in keymgr 157263363Semaste for (libgcc_object *ob = head->unseen_objects; ob != NULL; ob = ob->next) { 158263363Semaste CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; 159263363Semaste CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; 160263363Semaste const char *msg = CFI_Parser<LocalAddressSpace>::decodeFDE( 161263363Semaste LocalAddressSpace::sThisAddressSpace, 162263363Semaste (uintptr_t)ob->fde, &fdeInfo, &cieInfo); 163263363Semaste if (msg == NULL) { 164263363Semaste // Check if this FDE is for a function that includes the pc 165263363Semaste if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) { 166263363Semaste fde = (void*)fdeInfo.pcStart; 167263363Semaste _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, 168263363Semaste head); 169263363Semaste return true; 170263363Semaste } 171263363Semaste } 172263363Semaste } 173263363Semaste } 174263363Semaste // release libgcc_object_info 175263363Semaste _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, head); 176263363Semaste#else 177263363Semaste (void)pc; 178263363Semaste (void)fde; 179263363Semaste#endif 180263363Semaste return false; 181263363Semaste} 182263363Semaste 183263363Semaste} 184263363Semaste 185263363Semaste 186263363Semaste#if !defined(FOR_DYLD) && _LIBUNWIND_BUILD_SJLJ_APIS 187254721Semaste 188254721Semaste#include <System/pthread_machdep.h> 189263363Semaste 190263363Semaste// Accessors to get get/set linked list of frames for sjlj based execeptions. 191263363Semaste_LIBUNWIND_HIDDEN 192263363Semastestruct _Unwind_FunctionContext *__Unwind_SjLj_GetTopOfFunctionStack() { 193263363Semaste return (struct _Unwind_FunctionContext *) 194263363Semaste _pthread_getspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key); 195263363Semaste} 196263363Semaste 197263363Semaste_LIBUNWIND_HIDDEN 198263363Semastevoid __Unwind_SjLj_SetTopOfFunctionStack(struct _Unwind_FunctionContext *fc) { 199263363Semaste _pthread_setspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key, fc); 200263363Semaste} 201263363Semaste#endif 202263363Semaste 203263363Semaste 204263363Semaste 205263363Semaste 206263363Semaste