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Diffstat (limited to 'contrib/libcxxrt/unwind-arm.h')
| -rw-r--r-- | contrib/libcxxrt/unwind-arm.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/contrib/libcxxrt/unwind-arm.h b/contrib/libcxxrt/unwind-arm.h new file mode 100644 index 0000000..f9ed429 --- /dev/null +++ b/contrib/libcxxrt/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) |
