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Diffstat (limited to 'lldb/source/Plugins/Process/Utility/libunwind/src/UnwindLevel1-gcc-ext.c')
| -rw-r--r-- | lldb/source/Plugins/Process/Utility/libunwind/src/UnwindLevel1-gcc-ext.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/lldb/source/Plugins/Process/Utility/libunwind/src/UnwindLevel1-gcc-ext.c b/lldb/source/Plugins/Process/Utility/libunwind/src/UnwindLevel1-gcc-ext.c new file mode 100644 index 00000000000..7103c719ba2 --- /dev/null +++ b/lldb/source/Plugins/Process/Utility/libunwind/src/UnwindLevel1-gcc-ext.c @@ -0,0 +1,282 @@ +/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 vi:set tabstop=4 expandtab: -*/ +//===-- UnwindLevel1-gcc-ext.c ----------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +/* + * Implements gcc extensions to the C++ ABI Exception Handling Level 1 as documented at: + * <http://www.codesourcery.com/cxx-abi/abi-eh.html> + * using libunwind + * + */ + +#include <stdint.h> +#include <stdbool.h> +#include <stdlib.h> +#include <stdio.h> + +#include "libunwind.h" +#include "unwind.h" +#include "libunwind_priv.h" +#include "InternalMacros.h" + + +#if __ppc__ || __i386__ || __x86_64__ + +// +// Called by __cxa_rethrow() +// +EXPORT _Unwind_Reason_Code _Unwind_Resume_or_Rethrow(struct _Unwind_Exception* exception_object) +{ + DEBUG_PRINT_API("_Unwind_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_RaiseException(exception_object); + + // call through to _Unwind_Resume() which distiguishes between forced and regular exceptions + _Unwind_Resume(exception_object); + ABORT("_Unwind_Resume_or_Rethrow() called _Unwind_RaiseException() which unexpectedly returned"); +} + + + +// +// Called by personality handler during phase 2 to get base address for data relative encodings +// +EXPORT uintptr_t _Unwind_GetDataRelBase(struct _Unwind_Context* context) +{ + DEBUG_PRINT_API("_Unwind_GetDataRelBase(context=%p)\n", context); + ABORT("_Unwind_GetDataRelBase() not implemented"); +} + +// +// Called by personality handler during phase 2 to get base address for text relative encodings +// +EXPORT uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context* context) +{ + DEBUG_PRINT_API("_Unwind_GetTextRelBase(context=%p)\n", context); + ABORT("_Unwind_GetTextRelBase() not implemented"); +} + + + +// +// Scans unwind information to find the function that contains the +// specified code address "pc". +// +EXPORT void* _Unwind_FindEnclosingFunction(void* pc) +{ + DEBUG_PRINT_API("_Unwind_FindEnclosingFunction(pc=%p)\n", pc); + ABORT("_Unwind_FindEnclosingFunction() not implemented"); +} + + +// +// Walk every frame and call trace function at each one. If trace function +// returns anything other than _URC_NO_REASON, then walk is terminated. +// +EXPORT _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn callback, void* ref) +{ + unw_cursor_t cursor; + unw_context_t uc; + unw_getcontext(&uc); + unw_init_local(&cursor, &uc); + + DEBUG_PRINT_API("_Unwind_Backtrace(callback=%p)\n", callback); + + // walk each frame + while ( true ) { + + // ask libuwind to get next frame (skip over first frame which is _Unwind_Backtrace()) + if ( unw_step(&cursor) <= 0 ) { + DEBUG_PRINT_UNWINDING(" _backtrace: ended because cursor reached bottom of stack, returning %d\n", _URC_END_OF_STACK); + return _URC_END_OF_STACK; + } + + // debugging + if ( DEBUG_PRINT_UNWINDING_TEST ) { + char functionName[512]; + unw_proc_info_t frameInfo; + unw_word_t offset; + unw_get_proc_name(&cursor, functionName, 512, &offset); + unw_get_proc_info(&cursor, &frameInfo); + DEBUG_PRINT_UNWINDING(" _backtrace: start_ip=0x%llX, func=%s, lsda=0x%llX, context=%p\n", + frameInfo.start_ip, functionName, frameInfo.lsda, &cursor); + } + + // call trace function with this frame + _Unwind_Reason_Code result = (*callback)((struct _Unwind_Context*)(&cursor), ref); + if ( result != _URC_NO_REASON ) { + DEBUG_PRINT_UNWINDING(" _backtrace: ended because callback returned %d\n", result); + return result; + } + } +} + + +// +// Find dwarf unwind info for an address 'pc' in some function. +// +EXPORT const void* _Unwind_Find_FDE(const void* pc, struct dwarf_eh_bases* bases) +{ + // This is slow, but works. + // We create an unwind cursor then alter the IP to be pc + unw_cursor_t cursor; + unw_context_t uc; + unw_proc_info_t info; + unw_getcontext(&uc); + unw_init_local(&cursor, &uc); + unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)(long)pc); + unw_get_proc_info(&cursor, &info); + bases->tbase = info.extra; + bases->dbase = 0; // dbase not used on Mac OS X + bases->func = info.start_ip; + DEBUG_PRINT_API("_Unwind_Find_FDE(pc=%p) => %p\n", pc, (void*)(long)info.unwind_info); + return (void*)(long)info.unwind_info; +} + + + +EXPORT uintptr_t _Unwind_GetCFA(struct _Unwind_Context* context) +{ + unw_cursor_t* cursor = (unw_cursor_t*)context; + unw_word_t result; + unw_get_reg(cursor, UNW_REG_SP, &result); + DEBUG_PRINT_API("_Unwind_GetCFA(context=%p) => 0x%llX\n", context, (uint64_t)result); + return result; +} + + +// +// 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) +{ + DEBUG_PRINT_API("_Unwind_GetIPInfo(context=%p)\n", context); + *ipBefore = 0; + return _Unwind_GetIP(context); +} + + +// +// Called by programs with dynamic code generators that want +// to register a dynamically generated FDE. +// This function has existed on Mac OS X since 10.4, but +// never worked before. +// +EXPORT void __register_frame(const void* fde) +{ + DEBUG_PRINT_API("__register_frame(%p)\n", fde); + _unw_add_dynamic_fde((unw_word_t)(uintptr_t)fde); +} + + +// +// Called by programs with dynamic code generators that want +// to unregister a dynamically generated FDE. +// This function has existed on Mac OS X since 10.4, but +// never worked before. +// +EXPORT void __deregister_frame(const void* fde) +{ + DEBUG_PRINT_API("__deregister_frame(%p)\n", fde); + _unw_remove_dynamic_fde((unw_word_t)(uintptr_t)fde); +} + + + +// +// The following register/deregister functions are gcc extensions. +// They have existed on Mac OS X, but have never worked because Mac OS X +// before 10.6 used keymgr to track known FDEs, but these functions +// never got updated to use keymgr. +// For now, we implement these as do-nothing functions to keep any existing +// applications working. We also add the not in 10.6 symbol so that nwe +// application won't be able to use them. +// + +EXPORT void __register_frame_info_bases(const void* fde, void* ob, void* tb, void* db) +{ + DEBUG_PRINT_API("__register_frame_info_bases(%p,%p, %p, %p)\n", fde, ob, tb, db); + // do nothing, this function never worked in Mac OS X +} + +EXPORT void __register_frame_info(const void* fde, void* ob) +{ + DEBUG_PRINT_API("__register_frame_info(%p, %p)\n", fde, ob); + // do nothing, this function never worked in Mac OS X +} + + +EXPORT void __register_frame_info_table_bases(const void* fde, void* ob, void* tb, void* db) +{ + DEBUG_PRINT_API("__register_frame_info_table_bases(%p,%p, %p, %p)\n", fde, ob, tb, db); + // do nothing, this function never worked in Mac OS X +} + +EXPORT void __register_frame_info_table(const void* fde, void* ob) +{ + DEBUG_PRINT_API("__register_frame_info_table(%p, %p)\n", fde, ob); + // do nothing, this function never worked in Mac OS X +} + +EXPORT void __register_frame_table(const void* fde) +{ + DEBUG_PRINT_API("__register_frame_table(%p)\n", fde); + // do nothing, this function never worked in Mac OS X +} + +EXPORT void* __deregister_frame_info(const void* fde) +{ + DEBUG_PRINT_API("__deregister_frame_info(%p)\n", fde); + // do nothing, this function never worked in Mac OS X + return NULL; +} + +EXPORT void* __deregister_frame_info_bases(const void* fde) +{ + DEBUG_PRINT_API("__deregister_frame_info_bases(%p)\n", fde); + // do nothing, this function never worked in Mac OS X + return NULL; +} + + + + +// +// symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in earlier versions +// +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 // __ppc__ || __i386__ || __x86_64__ + |
