46fb43d099
the copy in libcxxrt for it, fix the arm-specific header to define the _Unwind_Action type. Submitted by: andrew MFC after: 3 days
226 lines
7.2 KiB
C
226 lines
7.2 KiB
C
/*
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* Copyright 2012 David Chisnall. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* ARM-specific unwind definitions. These are taken from the ARM EHABI
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* specification.
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*/
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typedef enum
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{
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_URC_OK = 0, /* operation completed successfully */
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_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
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_URC_END_OF_STACK = 5,
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_URC_HANDLER_FOUND = 6,
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_URC_INSTALL_CONTEXT = 7,
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_URC_CONTINUE_UNWIND = 8,
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_URC_FAILURE = 9, /* unspecified failure of some kind */
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_URC_FATAL_PHASE1_ERROR = _URC_FAILURE
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} _Unwind_Reason_Code;
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typedef int _Unwind_Action;
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typedef uint32_t _Unwind_State;
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#ifdef __clang__
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static const _Unwind_State _US_VIRTUAL_UNWIND_FRAME = 0;
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static const _Unwind_State _US_UNWIND_FRAME_STARTING = 1;
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static const _Unwind_State _US_UNWIND_FRAME_RESUME = 2;
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#else // GCC fails at knowing what a constant expression is
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# define _US_VIRTUAL_UNWIND_FRAME 0
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# define _US_UNWIND_FRAME_STARTING 1
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# define _US_UNWIND_FRAME_RESUME 2
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#endif
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typedef struct _Unwind_Context _Unwind_Context;
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typedef uint32_t _Unwind_EHT_Header;
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struct _Unwind_Exception
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{
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uint64_t exception_class;
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void (*exception_cleanup)(_Unwind_Reason_Code, struct _Unwind_Exception *);
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/* Unwinder cache, private fields for the unwinder's use */
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struct
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{
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uint32_t reserved1;
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uint32_t reserved2;
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uint32_t reserved3;
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uint32_t reserved4;
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uint32_t reserved5;
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/* init reserved1 to 0, then don't touch */
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} unwinder_cache;
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/* Propagation barrier cache (valid after phase 1): */
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struct
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{
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uint32_t sp;
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uint32_t bitpattern[5];
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} barrier_cache;
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/* Cleanup cache (preserved over cleanup): */
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struct
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{
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uint32_t bitpattern[4];
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} cleanup_cache;
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/* Pr cache (for pr's benefit): */
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struct
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{
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/** function start address */
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uint32_t fnstart;
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/** pointer to EHT entry header word */
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_Unwind_EHT_Header *ehtp;
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/** additional data */
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uint32_t additional;
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uint32_t reserved1;
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} pr_cache;
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/** Force alignment of next item to 8-byte boundary */
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long long int :0;
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};
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/* Unwinding functions */
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_Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception *ucbp);
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void _Unwind_Resume(struct _Unwind_Exception *ucbp);
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void _Unwind_Complete(struct _Unwind_Exception *ucbp);
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void _Unwind_DeleteException(struct _Unwind_Exception *ucbp);
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void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context*);
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typedef enum
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{
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_UVRSR_OK = 0,
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_UVRSR_NOT_IMPLEMENTED = 1,
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_UVRSR_FAILED = 2
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} _Unwind_VRS_Result;
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typedef enum
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{
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_UVRSC_CORE = 0,
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_UVRSC_VFP = 1,
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_UVRSC_WMMXD = 3,
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_UVRSC_WMMXC = 4
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} _Unwind_VRS_RegClass;
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typedef enum
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{
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_UVRSD_UINT32 = 0,
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_UVRSD_VFPX = 1,
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_UVRSD_UINT64 = 3,
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_UVRSD_FLOAT = 4,
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_UVRSD_DOUBLE = 5
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} _Unwind_VRS_DataRepresentation;
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_Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *context,
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_Unwind_VRS_RegClass regclass,
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uint32_t regno,
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_Unwind_VRS_DataRepresentation representation,
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void *valuep);
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_Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *context,
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_Unwind_VRS_RegClass regclass,
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uint32_t regno,
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_Unwind_VRS_DataRepresentation representation,
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void *valuep);
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/* Return the base-address for data references. */
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extern unsigned long _Unwind_GetDataRelBase(struct _Unwind_Context *);
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/* Return the base-address for text references. */
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extern unsigned long _Unwind_GetTextRelBase(struct _Unwind_Context *);
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extern unsigned long _Unwind_GetRegionStart(struct _Unwind_Context *);
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typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (struct _Unwind_Context *,
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void *);
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extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *);
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extern _Unwind_Reason_Code
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_Unwind_Resume_or_Rethrow (struct _Unwind_Exception *);
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/**
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* The next set of functions are compatibility extensions, implementing Itanium
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* ABI functions on top of ARM ones.
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*/
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#define _UA_SEARCH_PHASE 1
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#define _UA_CLEANUP_PHASE 2
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#define _UA_HANDLER_FRAME 4
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#define _UA_FORCE_UNWIND 8
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static inline unsigned long _Unwind_GetGR(struct _Unwind_Context *context, int reg)
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{
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unsigned long val;
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_Unwind_VRS_Get(context, _UVRSC_CORE, reg, _UVRSD_UINT32, &val);
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return val;
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}
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static inline void _Unwind_SetGR(struct _Unwind_Context *context, int reg, unsigned long val)
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{
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_Unwind_VRS_Set(context, _UVRSC_CORE, reg, _UVRSD_UINT32, &val);
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}
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static inline unsigned long _Unwind_GetIP(_Unwind_Context *context)
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{
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// Low bit store the thumb state - discard it
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return _Unwind_GetGR(context, 15) & ~1;
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}
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static inline void _Unwind_SetIP(_Unwind_Context *context, unsigned long val)
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{
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// The lowest bit of the instruction pointer indicates whether we're in
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// thumb or ARM mode. This is assumed to be fixed throughout a function,
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// so must be propagated when setting the program counter.
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unsigned long thumbState = _Unwind_GetGR(context, 15) & 1;
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_Unwind_SetGR(context, 15, (val | thumbState));
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}
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/** GNU API function that unwinds the frame */
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_Unwind_Reason_Code __gnu_unwind_frame(struct _Unwind_Exception*, struct _Unwind_Context*);
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#define DECLARE_PERSONALITY_FUNCTION(name) \
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_Unwind_Reason_Code name(_Unwind_State state,\
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struct _Unwind_Exception *exceptionObject,\
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struct _Unwind_Context *context);
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#define BEGIN_PERSONALITY_FUNCTION(name) \
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_Unwind_Reason_Code name(_Unwind_State state,\
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struct _Unwind_Exception *exceptionObject,\
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struct _Unwind_Context *context)\
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{\
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int version = 1;\
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uint64_t exceptionClass = exceptionObject->exception_class;\
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int actions;\
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switch (state)\
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{\
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default: return _URC_FAILURE;\
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case _US_VIRTUAL_UNWIND_FRAME:\
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{\
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actions = _UA_SEARCH_PHASE;\
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break;\
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}\
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case _US_UNWIND_FRAME_STARTING:\
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{\
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actions = _UA_CLEANUP_PHASE;\
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if (exceptionObject->barrier_cache.sp == _Unwind_GetGR(context, 13))\
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{\
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actions |= _UA_HANDLER_FRAME;\
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}\
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break;\
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}\
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case _US_UNWIND_FRAME_RESUME:\
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{\
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return continueUnwinding(exceptionObject, context);\
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break;\
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}\
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}\
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_Unwind_SetGR (context, 12, reinterpret_cast<unsigned long>(exceptionObject));\
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#define CALL_PERSONALITY_FUNCTION(name) name(state,exceptionObject,context)
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