diff options
| -rw-r--r-- | cxxabi.h | 14 | ||||
| -rw-r--r-- | dwarf_eh.h | 7 | ||||
| -rw-r--r-- | exception.cc | 170 | ||||
| -rw-r--r-- | guard.cc | 54 | ||||
| -rw-r--r-- | unwind-arm.h | 201 | ||||
| -rw-r--r-- | unwind-itanium.h | 170 | ||||
| -rw-r--r-- | unwind.h | 18 |
7 files changed, 615 insertions, 19 deletions
@@ -1,7 +1,7 @@ #ifndef __CXXABI_H_ #define __CXXABI_H_ #include <stdint.h> -#include <unwind.h> +#include "unwind.h" namespace std { class type_info; @@ -87,6 +87,18 @@ struct __cxa_exception * handler count reaches 0 (which it doesn't with the top bit set). */ int handlerCount; +#ifdef __arm__ + /** + * The ARM EH ABI requires the unwind library to keep track of exceptions + * during cleanups. These support nesting, so we need to keep a list of + * them. + */ + _Unwind_Exception *nextCleanup; + /** + * The number of cleanups that are currently being run on this exception. + */ + int cleanupCount; +#endif /** * The selector value to be returned when installing the catch handler. * Used at the call site to determine which catch() block should execute. @@ -16,10 +16,10 @@ // that it doesn't impact the rest of the program. #ifndef _GNU_SOURCE # define _GNU_SOURCE 1 -# include <unwind.h> +# include "unwind.h" # undef _GNU_SOURCE #else -# include <unwind.h> +# include "unwind.h" #endif #include <stdint.h> @@ -340,6 +340,9 @@ static inline struct dwarf_eh_lsda parse_lsda(_Unwind_Context *context, lsda.type_table = type_table; //lsda.type_table = (uintptr_t*)(data + v); } +#if __arm__ + lsda.type_table_encoding = (DW_EH_PE_pcrel | DW_EH_PE_indirect); +#endif lsda.callsite_encoding = (enum dwarf_data_encoding)(*(data++)); diff --git a/exception.cc b/exception.cc index 66e0929..abf6a10 100644 --- a/exception.cc +++ b/exception.cc @@ -2,6 +2,7 @@ #include <dlfcn.h> #include <stdio.h> #include <string.h> +#include <stdint.h> #include <pthread.h> #include "typeinfo.h" #include "dwarf_eh.h" @@ -9,6 +10,66 @@ using namespace ABI_NAMESPACE; +/** + * Saves the result of the landing pad that we have found. For ARM, this is + * stored in the generic unwind structure, while on other platforms it is + * stored in the C++ exception. + */ +static void saveLandingPad(struct _Unwind_Context *context, + struct _Unwind_Exception *ucb, + struct __cxa_exception *ex, + int selector, + dw_eh_ptr_t landingPad) +{ +#ifdef __arm__ + // On ARM, we store the saved exception in the generic part of the structure + ucb->barrier_cache.sp = _Unwind_GetGR(context, 13); + ucb->barrier_cache.bitpattern[1] = (uint32_t)selector; + ucb->barrier_cache.bitpattern[3] = (uint32_t)landingPad; +#endif + // Cache the results for the phase 2 unwind, if we found a handler + // and this is not a foreign exception. + if (ex) + { + ex->handlerSwitchValue = selector; + ex->catchTemp = landingPad; + } +} + +/** + * Loads the saved landing pad. Returns 1 on success, 0 on failure. + */ +static int loadLandingPad(struct _Unwind_Context *context, + struct _Unwind_Exception *ucb, + struct __cxa_exception *ex, + unsigned long *selector, + dw_eh_ptr_t *landingPad) +{ +#ifdef __arm__ + *selector = ucb->barrier_cache.bitpattern[1]; + *landingPad = (dw_eh_ptr_t)ucb->barrier_cache.bitpattern[3]; + return 1; +#else + if (ex) + { + *selector = ex->handlerSwitchValue; + *landingPad = (dw_eh_ptr_t)ex->catchTemp; + return 0; + } + return 0; +#endif +} + +static inline _Unwind_Reason_Code continueUnwinding(struct _Unwind_Exception *ex, + struct _Unwind_Context *context) +{ +#ifdef __arm__ + if (__gnu_unwind_frame(ex, context) != _URC_OK) { return _URC_FAILURE; } +#endif + return _URC_CONTINUE_UNWIND; +} + + extern "C" void __cxa_free_exception(void *thrown_exception); extern "C" void __cxa_free_dependent_exception(void *thrown_exception); extern "C" void* __dynamic_cast(const void *sub, @@ -59,6 +120,10 @@ struct __cxa_thread_info */ int emergencyBuffersHeld; /** + * The exception currently running in a cleanup. + */ + _Unwind_Exception *currentCleanup; + /** * The public part of this structure, accessible from outside of this * module. */ @@ -78,6 +143,10 @@ struct __cxa_dependent_exception terminate_handler terminateHandler; __cxa_exception *nextException; int handlerCount; +#ifdef __arm__ + _Unwind_Exception *nextCleanup; + int cleanupCount; +#endif int handlerSwitchValue; const char *actionRecord; const char *languageSpecificData; @@ -519,9 +588,11 @@ static void report_failure(_Unwind_Reason_Code err, __cxa_exception *thrown_exce case _URC_FATAL_PHASE1_ERROR: fprintf(stderr, "Fatal error during phase 1 unwinding\n"); break; +#ifndef __arm__ case _URC_FATAL_PHASE2_ERROR: fprintf(stderr, "Fatal error during phase 2 unwinding\n"); break; +#endif case _URC_END_OF_STACK: fprintf(stderr, "Terminating due to uncaught exception %p", (void*)thrown_exception); @@ -696,6 +767,7 @@ static std::type_info *get_type_info_entry(_Unwind_Context *context, // Get the address of the record in the table. dw_eh_ptr_t record = lsda->type_table - dwarf_size_of_fixed_size_field(lsda->type_table_encoding)*filter; + //record -= 4; dw_eh_ptr_t start = record; // Read the value, but it's probably an indirect reference... int64_t offset = read_value(lsda->type_table_encoding, &record); @@ -709,6 +781,7 @@ static std::type_info *get_type_info_entry(_Unwind_Context *context, } + /** * Checks the type signature found in a handler against the type of the thrown * object. If ex is 0 then it is assumed to be a foreign exception and only @@ -829,9 +902,22 @@ static handler_type check_action_record(_Unwind_Context *context, } else if (filter < 0 && 0 != ex) { - unsigned char *type_index = ((unsigned char*)lsda->type_table - filter - 1); bool matched = false; *selector = filter; +#ifdef __arm__ + filter++; + std::type_info *handler_type = get_type_info_entry(context, lsda, filter--); + while (handler_type) + { + if (check_type_signature(ex, handler_type, adjustedPtr)) + { + matched = true; + break; + } + handler_type = get_type_info_entry(context, lsda, filter--); + } +#else + unsigned char *type_index = ((unsigned char*)lsda->type_table - filter - 1); while (*type_index) { std::type_info *handler_type = get_type_info_entry(context, lsda, *(type_index++)); @@ -844,6 +930,7 @@ static handler_type check_action_record(_Unwind_Context *context, break; } } +#endif if (matched) { continue; } // If we don't find an allowed exception spec, we need to install // the context for this action. The landing pad will then call the @@ -859,17 +946,32 @@ static handler_type check_action_record(_Unwind_Context *context, return found; } +static void pushCleanupException(_Unwind_Exception *exceptionObject, + __cxa_exception *ex) +{ +#ifdef __arm__ + __cxa_thread_info *info = thread_info_fast(); + if (ex) + { + ex->cleanupCount++; + if (ex->cleanupCount > 1) + { + assert(exceptionObject == info->currentCleanup); + return; + } + ex->nextCleanup = info->currentCleanup; + } + info->currentCleanup = exceptionObject; +#endif +} + /** * The exception personality function. This is referenced in the unwinding * DWARF metadata and is called by the unwind library for each C++ stack frame * containing catch or cleanup code. */ -extern "C" _Unwind_Reason_Code __gxx_personality_v0(int version, - _Unwind_Action actions, - uint64_t exceptionClass, - struct _Unwind_Exception *exceptionObject, - struct _Unwind_Context *context) -{ +extern "C" +BEGIN_PERSONALITY_FUNCTION(__gxx_personality_v0) // This personality function is for version 1 of the ABI. If you use it // with a future version of the ABI, it won't know what to do, so it // reports a fatal error and give up before it breaks anything. @@ -896,7 +998,7 @@ extern "C" _Unwind_Reason_Code __gxx_personality_v0(int version, (unsigned char*)_Unwind_GetLanguageSpecificData(context); // No LSDA implies no landing pads - try the next frame - if (0 == lsda_addr) { return _URC_CONTINUE_UNWIND; } + if (0 == lsda_addr) { return continueUnwinding(exceptionObject, context); } // These two variables define how the exception will be handled. dwarf_eh_action action = {0}; @@ -941,15 +1043,14 @@ extern "C" _Unwind_Reason_Code __gxx_personality_v0(int version, // and this is not a foreign exception. if (ex) { - ex->handlerSwitchValue = selector; - ex->actionRecord = (const char*)action.action_record; + saveLandingPad(context, exceptionObject, ex, selector, action.landing_pad); ex->languageSpecificData = (const char*)lsda_addr; - ex->catchTemp = action.landing_pad; + ex->actionRecord = (const char*)action.action_record; // ex->adjustedPtr is set when finding the action record. } return _URC_HANDLER_FOUND; } - return _URC_CONTINUE_UNWIND; + return continueUnwinding(exceptionObject, context); } @@ -962,11 +1063,12 @@ extern "C" _Unwind_Reason_Code __gxx_personality_v0(int version, // cleanup struct dwarf_eh_lsda lsda = parse_lsda(context, lsda_addr); dwarf_eh_find_callsite(context, &lsda, &action); - if (0 == action.landing_pad) { return _URC_CONTINUE_UNWIND; } + if (0 == action.landing_pad) { return continueUnwinding(exceptionObject, context); } handler_type found_handler = check_action_record(context, &lsda, action.action_record, realEx, &selector, ex->adjustedPtr); // Ignore handlers this time. - if (found_handler != handler_cleanup) { return _URC_CONTINUE_UNWIND; } + if (found_handler != handler_cleanup) { return continueUnwinding(exceptionObject, context); } + pushCleanupException(exceptionObject, ex); } else if (foreignException) { @@ -983,9 +1085,8 @@ extern "C" _Unwind_Reason_Code __gxx_personality_v0(int version, else { // Restore the saved info if we saved some last time. - action.landing_pad = (dw_eh_ptr_t)ex->catchTemp; + loadLandingPad(context, exceptionObject, ex, &selector, &action.landing_pad); ex->catchTemp = 0; - selector = (unsigned long)ex->handlerSwitchValue; ex->handlerSwitchValue = 0; } @@ -1063,6 +1164,8 @@ extern "C" void *__cxa_begin_catch(void *e) return ((char*)exceptionObject + sizeof(_Unwind_Exception)); } + + /** * ABI function called when exiting a catch block. This will free the current * exception if it is no longer referenced in other catch blocks. @@ -1281,3 +1384,38 @@ namespace std return terminateHandler; } } +#ifdef __arm__ +extern "C" _Unwind_Exception *__cxa_get_cleanup(void) +{ + __cxa_thread_info *info = thread_info_fast(); + _Unwind_Exception *exceptionObject = info->currentCleanup; + if (isCXXException(exceptionObject->exception_class)) + { + __cxa_exception *ex = exceptionFromPointer(exceptionObject); + ex->cleanupCount--; + if (ex->cleanupCount == 0) + { + info->currentCleanup = ex->nextCleanup; + ex->nextCleanup = 0; + } + } + else + { + info->currentCleanup = 0; + } + return exceptionObject; +} + +asm ( +".pushsection .text.__cxa_end_cleanup \n" +".global __cxa_end_cleanup \n" +".type __cxa_end_cleanup, \"function\" \n" +"__cxa_end_cleanup: \n" +" push {r1, r2, r3, r4} \n" +" bl __cxa_get_cleanup \n" +" push {r1, r2, r3, r4} \n" +" b _Unwind_Resume \n" +" bl abort \n" +".popsection \n" +); +#endif @@ -16,6 +16,59 @@ */ #include <stdint.h> #include <pthread.h> +#include <assert.h> + +#ifdef __arm__ +// ARM ABI - 32-bit guards. + +/** + * Acquires a lock on a guard, returning 0 if the object has already been + * initialised, and 1 if it has not. If the object is already constructed then + * this function just needs to read a byte from memory and return. + */ +extern "C" int __cxa_guard_acquire(volatile int32_t *guard_object) +{ + if ((1<<31) == *guard_object) { return 0; } + // If we can atomically move the value from 0 -> 1, then this is + // uninitialised. + if (__sync_bool_compare_and_swap(guard_object, 0, 1)) + { + return 1; + } + // If the value is not 0, some other thread was initialising this. Spin + // until it's finished. + while (__sync_bool_compare_and_swap(guard_object, (1<<31), (1<<31))) + { + // If the other thread aborted, then we grab the lock + if (__sync_bool_compare_and_swap(guard_object, 0, 1)) + { + return 1; + } + sched_yield(); + } + return 0; +} + +/** + * Releases the lock without marking the object as initialised. This function + * is called if initialising a static causes an exception to be thrown. + */ +extern "C" void __cxa_guard_abort(int32_t *guard_object) +{ + assert(__sync_bool_compare_and_swap(guard_object, 1, 0)); +} +/** + * Releases the guard and marks the object as initialised. This function is + * called after successful initialisation of a static. + */ +extern "C" void __cxa_guard_release(int32_t *guard_object) +{ + assert(__sync_bool_compare_and_swap(guard_object, 1, (1<<31))); +} + + +#else +// Itanium ABI: 64-bit guards /** * Returns a pointer to the low 32 bits in a 64-bit value, respecting the @@ -78,3 +131,4 @@ extern "C" void __cxa_guard_release(int64_t *guard_object) __cxa_guard_abort(guard_object); } +#endif diff --git a/unwind-arm.h b/unwind-arm.h new file mode 100644 index 0000000..f9ed429 --- /dev/null +++ b/unwind-arm.h @@ -0,0 +1,201 @@ +/** + * ARM-specific unwind definitions. These are taken from the ARM EHABI + * specification. + */ + typedef enum +{ + _URC_OK = 0, /* operation completed successfully */ + _URC_FOREIGN_EXCEPTION_CAUGHT = 1, + _URC_END_OF_STACK = 5, + _URC_HANDLER_FOUND = 6, + _URC_INSTALL_CONTEXT = 7, + _URC_CONTINUE_UNWIND = 8, + _URC_FAILURE = 9, /* unspecified failure of some kind */ + _URC_FATAL_PHASE1_ERROR = _URC_FAILURE +} _Unwind_Reason_Code; + +typedef uint32_t _Unwind_State; +#ifdef __clang__ +static const _Unwind_State _US_VIRTUAL_UNWIND_FRAME = 0; +static const _Unwind_State _US_UNWIND_FRAME_STARTING = 1; +static const _Unwind_State _US_UNWIND_FRAME_RESUME = 2; +#else // GCC fails at knowing what a constant expression is +# define _US_VIRTUAL_UNWIND_FRAME 0 +# define _US_UNWIND_FRAME_STARTING 1 +# define _US_UNWIND_FRAME_RESUME 2 +#endif + +typedef struct _Unwind_Context _Unwind_Context; + +typedef uint32_t _Unwind_EHT_Header; + +struct _Unwind_Exception +{ + uint64_t exception_class; + void (*exception_cleanup)(_Unwind_Reason_Code, struct _Unwind_Exception *); + /* Unwinder cache, private fields for the unwinder's use */ + struct + { + uint32_t reserved1; + uint32_t reserved2; + uint32_t reserved3; + uint32_t reserved4; + uint32_t reserved5; + /* init reserved1 to 0, then don't touch */ + } unwinder_cache; + /* Propagation barrier cache (valid after phase 1): */ + struct + { + uint32_t sp; + uint32_t bitpattern[5]; + } barrier_cache; + /* Cleanup cache (preserved over cleanup): */ + struct + { + uint32_t bitpattern[4]; + } cleanup_cache; + /* Pr cache (for pr's benefit): */ + struct + { + /** function start address */ + uint32_t fnstart; + /** pointer to EHT entry header word */ + _Unwind_EHT_Header *ehtp; + /** additional data */ + uint32_t additional; + uint32_t reserved1; + } pr_cache; + /** Force alignment of next item to 8-byte boundary */ + long long int :0; +}; + +/* Unwinding functions */ +_Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception *ucbp); +void _Unwind_Resume(struct _Unwind_Exception *ucbp); +void _Unwind_Complete(struct _Unwind_Exception *ucbp); +void _Unwind_DeleteException(struct _Unwind_Exception *ucbp); +void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context*); + +typedef enum +{ + _UVRSR_OK = 0, + _UVRSR_NOT_IMPLEMENTED = 1, + _UVRSR_FAILED = 2 +} _Unwind_VRS_Result; +typedef enum +{ + _UVRSC_CORE = 0, + _UVRSC_VFP = 1, + _UVRSC_WMMXD = 3, + _UVRSC_WMMXC = 4 +} _Unwind_VRS_RegClass; +typedef enum +{ + _UVRSD_UINT32 = 0, + _UVRSD_VFPX = 1, + _UVRSD_UINT64 = 3, + _UVRSD_FLOAT = 4, + _UVRSD_DOUBLE = 5 +} _Unwind_VRS_DataRepresentation; + +_Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *context, + _Unwind_VRS_RegClass regclass, + uint32_t regno, + _Unwind_VRS_DataRepresentation representation, + void *valuep); +_Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *context, + _Unwind_VRS_RegClass regclass, + uint32_t regno, + _Unwind_VRS_DataRepresentation representation, + void *valuep); + +/* Return the base-address for data references. */ +extern unsigned long _Unwind_GetDataRelBase(struct _Unwind_Context *); + +/* Return the base-address for text references. */ +extern unsigned long _Unwind_GetTextRelBase(struct _Unwind_Context *); +extern unsigned long _Unwind_GetRegionStart(struct _Unwind_Context *); + +typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (struct _Unwind_Context *, + void *); +extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *); +extern _Unwind_Reason_Code + _Unwind_Resume_or_Rethrow (struct _Unwind_Exception *); + +/** + * The next set of functions are compatibility extensions, implementing Itanium + * ABI functions on top of ARM ones. + */ + +#define _UA_SEARCH_PHASE 1 +#define _UA_CLEANUP_PHASE 2 +#define _UA_HANDLER_FRAME 4 +#define _UA_FORCE_UNWIND 8 + +static inline unsigned long _Unwind_GetGR(struct _Unwind_Context *context, int reg) +{ + unsigned long val; + _Unwind_VRS_Get(context, _UVRSC_CORE, reg, _UVRSD_UINT32, &val); + return val; +} +static inline void _Unwind_SetGR(struct _Unwind_Context *context, int reg, unsigned long val) +{ + _Unwind_VRS_Set(context, _UVRSC_CORE, reg, _UVRSD_UINT32, &val); +} +static inline unsigned long _Unwind_GetIP(_Unwind_Context *context) +{ + // Low bit store the thumb state - discard it + return _Unwind_GetGR(context, 15) & ~1; +} +static inline void _Unwind_SetIP(_Unwind_Context *context, unsigned long val) +{ + // The lowest bit of the instruction pointer indicates whether we're in + // thumb or ARM mode. This is assumed to be fixed throughout a function, + // so must be propagated when setting the program counter. + unsigned long thumbState = _Unwind_GetGR(context, 15) & 1; + _Unwind_SetGR(context, 15, (val | thumbState)); +} + +/** GNU API function that unwinds the frame */ +_Unwind_Reason_Code __gnu_unwind_frame(struct _Unwind_Exception*, struct _Unwind_Context*); + + +#define DECLARE_PERSONALITY_FUNCTION(name) \ +_Unwind_Reason_Code name(_Unwind_State state,\ + struct _Unwind_Exception *exceptionObject,\ + struct _Unwind_Context *context); + +#define BEGIN_PERSONALITY_FUNCTION(name) \ +_Unwind_Reason_Code name(_Unwind_State state,\ + struct _Unwind_Exception *exceptionObject,\ + struct _Unwind_Context *context)\ +{\ + int version = 1;\ + uint64_t exceptionClass = exceptionObject->exception_class;\ + int actions;\ + switch (state)\ + {\ + default: return _URC_FAILURE;\ + case _US_VIRTUAL_UNWIND_FRAME:\ + {\ + actions = _UA_SEARCH_PHASE;\ + break;\ + }\ + case _US_UNWIND_FRAME_STARTING:\ + {\ + actions = _UA_CLEANUP_PHASE;\ + if (exceptionObject->barrier_cache.sp == _Unwind_GetGR(context, 13))\ + {\ + actions |= _UA_HANDLER_FRAME;\ + }\ + break;\ + }\ + case _US_UNWIND_FRAME_RESUME:\ + {\ + return continueUnwinding(exceptionObject, context);\ + break;\ + }\ + }\ + _Unwind_SetGR (context, 12, (unsigned long)exceptionObject);\ + +#define CALL_PERSONALITY_FUNCTION(name) name(state,exceptionObject,context) diff --git a/unwind-itanium.h b/unwind-itanium.h new file mode 100644 index 0000000..16b3eed --- /dev/null +++ b/unwind-itanium.h @@ -0,0 +1,170 @@ +/* libunwind - a platform-independent unwind library + Copyright (C) 2003 Hewlett-Packard Co + Contributed by David Mosberger-Tang <davidm@hpl.hp.com> + +This file is part of libunwind. + +Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ + +#ifndef _UNWIND_H +#define _UNWIND_H + +/* For uint64_t */ +#include <stdint.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* Minimal interface as per C++ ABI draft standard: + + http://www.codesourcery.com/cxx-abi/abi-eh.html */ + +typedef enum + { + _URC_NO_REASON = 0, + _URC_FOREIGN_EXCEPTION_CAUGHT = 1, + _URC_FATAL_PHASE2_ERROR = 2, + _URC_FATAL_PHASE1_ERROR = 3, + _URC_NORMAL_STOP = 4, + _URC_END_OF_STACK = 5, + _URC_HANDLER_FOUND = 6, + _URC_INSTALL_CONTEXT = 7, + _URC_CONTINUE_UNWIND = 8 + } +_Unwind_Reason_Code; + +typedef int _Unwind_Action; + +#define _UA_SEARCH_PHASE 1 +#define _UA_CLEANUP_PHASE 2 +#define _UA_HANDLER_FRAME 4 +#define _UA_FORCE_UNWIND 8 + +struct _Unwind_Context; /* opaque data-structure */ +struct _Unwind_Exception; /* forward-declaration */ + +typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code, + struct _Unwind_Exception *); + +typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn) (int, _Unwind_Action, + uint64_t, + struct _Unwind_Exception *, + struct _Unwind_Context *, + void *); + +/* The C++ ABI requires exception_class, private_1, and private_2 to + be of type uint64 and the entire structure to be + double-word-aligned. Please note that exception_class stays 64-bit + even on 32-bit machines for gcc compatibility. */ +struct _Unwind_Exception + { + uint64_t exception_class; + _Unwind_Exception_Cleanup_Fn exception_cleanup; + unsigned long private_1; + unsigned long private_2; + } __attribute__((__aligned__)); + +extern _Unwind_Reason_Code _Unwind_RaiseException (struct _Unwind_Exception *); +extern _Unwind_Reason_Code _Unwind_ForcedUnwind (struct _Unwind_Exception *, + _Unwind_Stop_Fn, void *); +extern void _Unwind_Resume (struct _Unwind_Exception *); +extern void _Unwind_DeleteException (struct _Unwind_Exception *); +extern unsigned long _Unwind_GetGR (struct _Unwind_Context *, int); +extern void _Unwind_SetGR (struct _Unwind_Context *, int, unsigned long); +extern unsigned long _Unwind_GetIP (struct _Unwind_Context *); +extern unsigned long _Unwind_GetIPInfo (struct _Unwind_Context *, int *); +extern void _Unwind_SetIP (struct _Unwind_Context *, unsigned long); +extern unsigned long _Unwind_GetLanguageSpecificData (struct _Unwind_Context*); +extern unsigned long _Unwind_GetRegionStart (struct _Unwind_Context *); + +#ifdef _GNU_SOURCE + +/* Callback for _Unwind_Backtrace(). The backtrace stops immediately + if the callback returns any value other than _URC_NO_REASON. */ +typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (struct _Unwind_Context *, + void *); + +/* See http://gcc.gnu.org/ml/gcc-patches/2001-09/msg00082.html for why + _UA_END_OF_STACK exists. */ +# define _UA_END_OF_STACK 16 + +/* If the unwind was initiated due to a forced unwind, resume that + operation, else re-raise the exception. This is used by + __cxa_rethrow(). */ +extern _Unwind_Reason_Code + _Unwind_Resume_or_Rethrow (struct _Unwind_Exception *); + +/* See http://gcc.gnu.org/ml/gcc-patches/2003-09/msg00154.html for why + _Unwind_GetBSP() exists. */ +extern unsigned long _Unwind_GetBSP (struct _Unwind_Context *); + +/* Return the "canonical frame address" for the given context. + This is used by NPTL... */ +extern unsigned long _Unwind_GetCFA (struct _Unwind_Context *); + +/* Return the base-address for data references. */ +extern unsigned long _Unwind_GetDataRelBase (struct _Unwind_Context *); + +/* Return the base-address for text references. */ +extern unsigned long _Unwind_GetTextRelBase (struct _Unwind_Context *); + +/* Call _Unwind_Trace_Fn once for each stack-frame, without doing any + cleanup. The first frame for which the callback is invoked is the + one for the caller of _Unwind_Backtrace(). _Unwind_Backtrace() + returns _URC_END_OF_STACK when the backtrace stopped due to + reaching the end of the call-chain or _URC_FATAL_PHASE1_ERROR if it + stops for any other reason. */ +extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *); + +/* Find the start-address of the procedure containing the specified IP + or NULL if it cannot be found (e.g., because the function has no + unwind info). Note: there is not necessarily a one-to-one + correspondence between source-level functions and procedures: some + functions don't have unwind-info and others are split into multiple + procedures. */ +extern void *_Unwind_FindEnclosingFunction (void *); + +/* See also Linux Standard Base Spec: + http://www.linuxbase.org/spec/refspecs/LSB_1.3.0/gLSB/gLSB/libgcc-s.html */ + +#endif /* _GNU_SOURCE */ + +#define DECLARE_PERSONALITY_FUNCTION(name) \ +_Unwind_Reason_Code name(int version,\ + _Unwind_Action actions,\ + uint64_t exceptionClass,\ + struct _Unwind_Exception *exceptionObject,\ + struct _Unwind_Context *context); +#define BEGIN_PERSONALITY_FUNCTION(name) \ +_Unwind_Reason_Code name(int version,\ + _Unwind_Action actions,\ + uint64_t exceptionClass,\ + struct _Unwind_Exception *exceptionObject,\ + struct _Unwind_Context *context)\ +{ + +#define CALL_PERSONALITY_FUNCTION(name) name(version, actions, exceptionClass, exceptionObject, context) + +#ifdef __cplusplus +} +#endif + +#endif /* _UNWIND_H */ diff --git a/unwind.h b/unwind.h new file mode 100644 index 0000000..5089491 --- /dev/null +++ b/unwind.h @@ -0,0 +1,18 @@ +#ifndef UNWIND_H_INCLUDED +#define UNWIND_H_INCLUDED + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef __arm__ +#include "unwind-arm.h" +#else +#include "unwind-itanium.h" +#endif + +#ifdef __cplusplus +} +#endif + +#endif |
