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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//
// C++ ABI Level 1 ABI documented at:
// https://github.com/ARM-software/abi-aa/blob/main/ehabi32/ehabi32.rst
//
//===----------------------------------------------------------------------===//
#ifndef __ARM_EHABI_UNWIND_H__
#define __ARM_EHABI_UNWIND_H__
typedef uint32_t _Unwind_State;
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;
/* Undocumented flag for force unwinding. */
static const _Unwind_State _US_FORCE_UNWIND = 8;
typedef uint32_t _Unwind_EHT_Header;
/*
* gcc_personality_v0 references 'struct _Unwind_Exception' all over the place.
* Nothing in libunwind cares about 'struct _Unwind_Control_Block,' so make it
* the alias of struct _Unwind_Exception, instead of the other way around.
*/
struct _Unwind_Exception;
typedef struct _Unwind_Exception _Unwind_Exception;
typedef struct _Unwind_Exception _Unwind_Control_Block; /* Alias */
typedef uint8_t _Unwind_Exception_Class[8];
struct _Unwind_Exception {
_Unwind_Exception_Class exception_class;
void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block*);
/* Unwinder cache, private fields for the unwinder's use */
struct {
uint32_t reserved1; /* init reserved1 to 0, then don't touch */
uint32_t reserved2;
uint32_t reserved3;
uint32_t reserved4;
uint32_t reserved5;
} 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 {
uint32_t fnstart; /* function start address */
_Unwind_EHT_Header* ehtp; /* pointer to EHT entry header word */
uint32_t additional;
uint32_t reserved1;
} pr_cache;
long long int :0; /* Enforce the 8-byte alignment */
} __attribute__((__aligned__(8)));
typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(
_Unwind_State state, _Unwind_Exception *exceptionObject,
struct _Unwind_Context *context);
#ifdef __cplusplus
extern "C" {
#endif
//
// The following are the base functions documented by the C++ ABI
//
#ifdef __USING_SJLJ_EXCEPTIONS__
extern _Unwind_Reason_Code
_Unwind_SjLj_RaiseException(_Unwind_Exception *exception_object);
extern void _Unwind_SjLj_Resume(_Unwind_Exception *exception_object);
#else
extern _Unwind_Reason_Code
_Unwind_RaiseException(_Unwind_Exception *exception_object);
extern void _Unwind_Resume(_Unwind_Exception *exception_object);
#endif
extern void _Unwind_DeleteException(_Unwind_Exception *exception_object);
typedef enum {
_UVRSC_CORE = 0, /* integer register */
_UVRSC_VFP = 1, /* vfp */
_UVRSC_WMMXD = 3, /* Intel WMMX data register */
_UVRSC_WMMXC = 4 /* Intel WMMX control register */
} _Unwind_VRS_RegClass;
typedef enum {
_UVRSD_UINT32 = 0,
_UVRSD_VFPX = 1,
_UVRSD_UINT64 = 3,
_UVRSD_FLOAT = 4,
_UVRSD_DOUBLE = 5
} _Unwind_VRS_DataRepresentation;
typedef enum {
_UVRSR_OK = 0,
_UVRSR_NOT_IMPLEMENTED = 1,
_UVRSR_FAILED = 2
} _Unwind_VRS_Result;
extern void _Unwind_Complete(_Unwind_Exception* exception_object);
extern _Unwind_VRS_Result
_Unwind_VRS_Get(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
uint32_t regno, _Unwind_VRS_DataRepresentation representation,
void *valuep);
extern _Unwind_VRS_Result
_Unwind_VRS_Set(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
uint32_t regno, _Unwind_VRS_DataRepresentation representation,
void *valuep);
extern _Unwind_VRS_Result
_Unwind_VRS_Pop(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
uint32_t discriminator,
_Unwind_VRS_DataRepresentation representation);
#if defined(_LIBUNWIND_UNWIND_LEVEL1_EXTERNAL_LINKAGE)
#define _LIBUNWIND_EXPORT_UNWIND_LEVEL1 extern
#else
#define _LIBUNWIND_EXPORT_UNWIND_LEVEL1 static __inline__
#endif
// These are de facto helper functions for ARM, which delegate the function
// calls to _Unwind_VRS_Get/Set(). These are not a part of ARM EHABI
// specification, thus these function MUST be inlined. Please don't replace
// these with the "extern" function declaration; otherwise, the program
// including this <unwind.h> header won't be ABI compatible and will result in
// link error when we are linking the program with libgcc.
_LIBUNWIND_EXPORT_UNWIND_LEVEL1
uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, int index) {
uintptr_t value = 0;
_Unwind_VRS_Get(context, _UVRSC_CORE, (uint32_t)index, _UVRSD_UINT32, &value);
return value;
}
_LIBUNWIND_EXPORT_UNWIND_LEVEL1
void _Unwind_SetGR(struct _Unwind_Context *context, int index,
uintptr_t value) {
_Unwind_VRS_Set(context, _UVRSC_CORE, (uint32_t)index, _UVRSD_UINT32, &value);
}
_LIBUNWIND_EXPORT_UNWIND_LEVEL1
uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
// remove the thumb-bit before returning
return _Unwind_GetGR(context, 15) & (~(uintptr_t)0x1);
}
_LIBUNWIND_EXPORT_UNWIND_LEVEL1
void _Unwind_SetIP(struct _Unwind_Context *context, uintptr_t value) {
uintptr_t thumb_bit = _Unwind_GetGR(context, 15) & ((uintptr_t)0x1);
_Unwind_SetGR(context, 15, value | thumb_bit);
}
#ifdef __cplusplus
}
#endif
#endif // __ARM_EHABI_UNWIND_H__
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