// // Called by personality handler during phase 2 to get instruction pointer // ipBefore is a boolean that says if IP is already adjusted to be the call // site address. Normally IP is the return address. // EXPORT uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context* context, int* ipBefore) { _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t)context; *ipBefore = 0; DEBUG_PRINT_API("_Unwind_GetIPInfo(context=%p, %p) => 0x%lX\n", context, ipBefore, ufc->resumeLocation+1); return ufc->resumeLocation+1; }
// // Called by personality handler during phase 2 to get register values // EXPORT uintptr_t _Unwind_GetGR(struct _Unwind_Context* context, int index) { unw_cursor_t* cursor = (unw_cursor_t*)context; unw_word_t result; unw_get_reg(cursor, index, &result); DEBUG_PRINT_API("_Unwind_GetGR(context=%p, reg=%d) => 0x%llX\n", context, index, (uint64_t)result); return result; }
// // Called by personality handler during phase 2 to get instruction pointer // EXPORT uintptr_t _Unwind_GetIP(struct _Unwind_Context* context) { unw_cursor_t* cursor = (unw_cursor_t*)context; unw_word_t result; unw_get_reg(cursor, UNW_REG_IP, &result); DEBUG_PRINT_API("_Unwind_GetIP(context=%p) => 0x%llX\n", context, (uint64_t)result); return result; }
// // Called by personality handler during phase 2 to find the start of the function // EXPORT uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context* context) { unw_cursor_t* cursor = (unw_cursor_t*)context; unw_proc_info_t frameInfo; uintptr_t result = 0; if ( unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS ) result = frameInfo.start_ip; DEBUG_PRINT_API("_Unwind_GetRegionStart(context=%p) => 0x%lX\n", context, result); return result; }
// // Called by personality handler to get Call Frame Area for current frame // EXPORT uintptr_t _Unwind_GetCFA(struct _Unwind_Context* context) { DEBUG_PRINT_API("_Unwind_GetCFA(context=%p)\n", context); if ( context != NULL ) { _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t)context; // setjmp/longjmp based exceptions don't have a true CFA // the SP in the jmpbuf is the closest approximation return (uintptr_t)ufc->jbuf[2]; } return 0; }
// // When _Unwind_RaiseException() is in phase2, it hands control // to the personality function at each frame. The personality // may force a jump to a landing pad in that function, the landing // pad code may then call _Unwind_Resume() to continue with the // unwinding. Note: the call to _Unwind_Resume() is from compiler // geneated user code. All other _Unwind_* routines are called // by the C++ runtime __cxa_* routines. // // Re-throwing an exception is implemented by having the code call // __cxa_rethrow() which in turn calls _Unwind_Resume_or_Rethrow() // EXPORT void _Unwind_SjLj_Resume(struct _Unwind_Exception* exception_object) { DEBUG_PRINT_API("_Unwind_SjLj_Resume(ex_obj=%p)\n", exception_object); if ( exception_object->private_1 != 0 ) unwind_phase2_forced(exception_object, (_Unwind_Stop_Fn)exception_object->private_1, (void*)exception_object->private_2); else unwind_phase2(exception_object); // clients assume _Unwind_Resume() does not return, so all we can do is abort. ABORT("_Unwind_SjLj_Resume() can't return"); }
// // Called by __cxa_rethrow() // EXPORT _Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception* exception_object) { DEBUG_PRINT_API("__Unwind_SjLj_Resume_or_Rethrow(ex_obj=%p), private_1=%ld\n", exception_object, exception_object->private_1); // if this is non-forced and a stopping place was found, then this is a re-throw // call _Unwind_RaiseException() as if this was a new exception if ( exception_object->private_1 == 0 ) _Unwind_SjLj_RaiseException(exception_object); // call through to _Unwind_Resume() which distiguishes between forced and regular exceptions _Unwind_SjLj_Resume(exception_object); ABORT("__Unwind_SjLj_Resume_or_Rethrow() called _Unwind_SjLj_Resume() which unexpectedly returned"); }
// // Not used by C++. // Unwinds stack, calling "stop" function at each frame // Could be used to implement longjmp(). // EXPORT _Unwind_Reason_Code _Unwind_ForcedUnwind(struct _Unwind_Exception* exception_object, _Unwind_Stop_Fn stop, void* stop_parameter) { DEBUG_PRINT_API("_Unwind_ForcedUnwind(ex_obj=%p, stop=%p)\n", exception_object, stop); unw_context_t uc; unw_getcontext(&uc); // mark that this is a forced unwind, so _Unwind_Resume() can do the right thing exception_object->private_1 = (uintptr_t)stop; exception_object->private_2 = (uintptr_t)stop_parameter; // doit return unwind_phase2_forced(&uc, exception_object, stop, stop_parameter); }
// // Called by personality handler during phase 2 to get LSDA for current frame // EXPORT uintptr_t _Unwind_GetLanguageSpecificData(struct _Unwind_Context* context) { unw_cursor_t* cursor = (unw_cursor_t*)context; unw_proc_info_t frameInfo; uintptr_t result = 0; if ( unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS ) result = frameInfo.lsda; DEBUG_PRINT_API("_Unwind_GetLanguageSpecificData(context=%p) => 0x%lX\n", context, result); if ( result != 0 ) { if ( *((uint8_t*)result) != 0xFF ) DEBUG_MESSAGE("lsda at 0x%lX does not start with 0xFF\n", result); } return result; }
// // Called by __cxa_throw. Only returns if there is a fatal error // EXPORT _Unwind_Reason_Code _Unwind_SjLj_RaiseException(struct _Unwind_Exception* exception_object) { DEBUG_PRINT_API("_Unwind_SjLj_RaiseException(ex_obj=%p)\n", exception_object); // mark that this is a non-forced unwind, so _Unwind_Resume() can do the right thing exception_object->private_1 = 0; exception_object->private_2 = 0; // phase 1: the search phase _Unwind_Reason_Code phase1 = unwind_phase1(exception_object); if ( phase1 != _URC_NO_REASON ) return phase1; // phase 2: the clean up phase return unwind_phase2(exception_object); }
// // Called by personality handler during phase 2 to alter register values // EXPORT void _Unwind_SetGR(struct _Unwind_Context* context, int index, uintptr_t new_value) { DEBUG_PRINT_API("_Unwind_SetGR(context=%p, reg=%d, value=0x%0llX)\n", context, index, (uint64_t)new_value); unw_cursor_t* cursor = (unw_cursor_t*)context; unw_set_reg(cursor, index, new_value); }
// // Called by personality handler during phase 2 to alter instruction pointer // EXPORT void _Unwind_SetIP(struct _Unwind_Context* context, uintptr_t new_value) { DEBUG_PRINT_API("_Unwind_SetIP(context=%p, value=0x%0lX)\n", context, new_value); _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t)context; ufc->resumeLocation = new_value-1; }
// // Called by personality handler during phase 2 to get instruction pointer // EXPORT uintptr_t _Unwind_GetIP(struct _Unwind_Context* context) { _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t)context; DEBUG_PRINT_API("_Unwind_GetIP(context=%p) => 0x%lX\n", context, ufc->resumeLocation+1); return ufc->resumeLocation+1; }
// // Called by personality handler during phase 2 to alter register values // EXPORT void _Unwind_SetGR(struct _Unwind_Context* context, int index, uintptr_t new_value) { DEBUG_PRINT_API("_Unwind_SetGR(context=%p, reg=%d, value=0x%0lX)\n", context, index, new_value); _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t)context; ufc->resumeParameters[index] = new_value; }
// // Called by personality handler during phase 2 to get register values // EXPORT uintptr_t _Unwind_GetGR(struct _Unwind_Context* context, int index) { DEBUG_PRINT_API("_Unwind_GetGR(context=%p, reg=%d)\n", context, index); _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t)context; return ufc->resumeParameters[index]; }
// // Called by personality handler during phase 2 to get LSDA for current frame // EXPORT uintptr_t _Unwind_GetLanguageSpecificData(struct _Unwind_Context* context) { _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t)context; DEBUG_PRINT_API("_Unwind_GetLanguageSpecificData(context=%p) => 0x%0lX\n", context, ufc->lsda); return ufc->lsda; }
// // Called by personality handler during phase 2 to alter instruction pointer // EXPORT void _Unwind_SetIP(struct _Unwind_Context* context, uintptr_t new_value) { DEBUG_PRINT_API("_Unwind_SetIP(context=%p, value=0x%0llX)\n", context, (uint64_t)new_value); unw_cursor_t* cursor = (unw_cursor_t*)context; unw_set_reg(cursor, UNW_REG_IP, new_value); }
// // Called by personality handler during phase 2 to find the start of the function // EXPORT uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context* context) { // Not supported or needed for sjlj based unwinding DEBUG_PRINT_API("_Unwind_GetRegionStart(context=%p)\n", context); return 0; }
// // Called by personality handler during phase 2 if a foreign exception is caught // EXPORT void _Unwind_DeleteException(struct _Unwind_Exception* exception_object) { DEBUG_PRINT_API("_Unwind_DeleteException(ex_obj=%p)\n", exception_object); if ( exception_object->exception_cleanup != NULL ) (*exception_object->exception_cleanup)(_URC_FOREIGN_EXCEPTION_CAUGHT, exception_object); }
// // Called by personality handler during phase 2 to get base address for text relative encodings // EXPORT uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context* context) { // Not supported or needed for sjlj based unwinding DEBUG_PRINT_API("_Unwind_GetTextRelBase(context=%p)\n", context); ABORT("_Unwind_GetTextRelBase() not implemented"); }