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Editing: unwind-arm.h

/* 
 * Copyright 2012 David Chisnall. All rights reserved.
 *
 * 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.
 */

/* For uint32_t and uint64_t */
#include <stdint.h>

/**
 * 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 int _Unwind_Action;

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;
static const _Unwind_State _US_ACTION_MASK           = 3;
#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
#	define _US_ACTION_MASK           3
#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, reinterpret_cast<unsigned long>(exceptionObject));\

#define CALL_PERSONALITY_FUNCTION(name) name(state,exceptionObject,context)

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