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  1. //===----------------------------------------------------------------------===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //
  8. // C++ ABI Level 1 ABI documented at:
  9. //   https://github.com/ARM-software/abi-aa/blob/main/ehabi32/ehabi32.rst
  10. //
  11. //===----------------------------------------------------------------------===//
  12.  
  13. #ifndef __ARM_EHABI_UNWIND_H__
  14. #define __ARM_EHABI_UNWIND_H__
  15.  
  16. typedef uint32_t _Unwind_State;
  17.  
  18. static const _Unwind_State _US_VIRTUAL_UNWIND_FRAME   = 0;
  19. static const _Unwind_State _US_UNWIND_FRAME_STARTING  = 1;
  20. static const _Unwind_State _US_UNWIND_FRAME_RESUME    = 2;
  21. static const _Unwind_State _US_ACTION_MASK            = 3;
  22. /* Undocumented flag for force unwinding. */
  23. static const _Unwind_State _US_FORCE_UNWIND           = 8;
  24.  
  25. typedef uint32_t _Unwind_EHT_Header;
  26.  
  27. struct _Unwind_Control_Block;
  28. typedef struct _Unwind_Control_Block _Unwind_Control_Block;
  29. #define _Unwind_Exception _Unwind_Control_Block /* Alias */
  30. typedef uint8_t _Unwind_Exception_Class[8];
  31.  
  32. struct _Unwind_Control_Block {
  33.   _Unwind_Exception_Class exception_class;
  34.   void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block*);
  35.  
  36.   /* Unwinder cache, private fields for the unwinder's use */
  37.   struct {
  38.     uint32_t reserved1; /* init reserved1 to 0, then don't touch */
  39.     uint32_t reserved2;
  40.     uint32_t reserved3;
  41.     uint32_t reserved4;
  42.     uint32_t reserved5;
  43.   } unwinder_cache;
  44.  
  45.   /* Propagation barrier cache (valid after phase 1): */
  46.   struct {
  47.     uint32_t sp;
  48.     uint32_t bitpattern[5];
  49.   } barrier_cache;
  50.  
  51.   /* Cleanup cache (preserved over cleanup): */
  52.   struct {
  53.     uint32_t bitpattern[4];
  54.   } cleanup_cache;
  55.  
  56.   /* Pr cache (for pr's benefit): */
  57.   struct {
  58.     uint32_t fnstart; /* function start address */
  59.     _Unwind_EHT_Header* ehtp; /* pointer to EHT entry header word */
  60.     uint32_t additional;
  61.     uint32_t reserved1;
  62.   } pr_cache;
  63.  
  64.   long long int :0; /* Enforce the 8-byte alignment */
  65. } __attribute__((__aligned__(8)));
  66.  
  67. typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(
  68.     _Unwind_State state, _Unwind_Exception *exceptionObject,
  69.     struct _Unwind_Context *context);
  70.  
  71. #ifdef __cplusplus
  72. extern "C" {
  73. #endif
  74.  
  75. //
  76. // The following are the base functions documented by the C++ ABI
  77. //
  78. #ifdef __USING_SJLJ_EXCEPTIONS__
  79. extern _Unwind_Reason_Code
  80.     _Unwind_SjLj_RaiseException(_Unwind_Exception *exception_object);
  81. extern void _Unwind_SjLj_Resume(_Unwind_Exception *exception_object);
  82. #else
  83. extern _Unwind_Reason_Code
  84.     _Unwind_RaiseException(_Unwind_Exception *exception_object);
  85. extern void _Unwind_Resume(_Unwind_Exception *exception_object);
  86. #endif
  87. extern void _Unwind_DeleteException(_Unwind_Exception *exception_object);
  88.  
  89. typedef enum {
  90.   _UVRSC_CORE = 0,  /* integer register */
  91.   _UVRSC_VFP = 1,   /* vfp */
  92.   _UVRSC_WMMXD = 3, /* Intel WMMX data register */
  93.   _UVRSC_WMMXC = 4, /* Intel WMMX control register */
  94.   _UVRSC_PSEUDO = 5 /* Special purpose pseudo register */
  95. } _Unwind_VRS_RegClass;
  96.  
  97. typedef enum {
  98.   _UVRSD_UINT32 = 0,
  99.   _UVRSD_VFPX = 1,
  100.   _UVRSD_UINT64 = 3,
  101.   _UVRSD_FLOAT = 4,
  102.   _UVRSD_DOUBLE = 5
  103. } _Unwind_VRS_DataRepresentation;
  104.  
  105. typedef enum {
  106.   _UVRSR_OK = 0,
  107.   _UVRSR_NOT_IMPLEMENTED = 1,
  108.   _UVRSR_FAILED = 2
  109. } _Unwind_VRS_Result;
  110.  
  111. extern void _Unwind_Complete(_Unwind_Exception* exception_object);
  112.  
  113. extern _Unwind_VRS_Result
  114. _Unwind_VRS_Get(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
  115.                 uint32_t regno, _Unwind_VRS_DataRepresentation representation,
  116.                 void *valuep);
  117.  
  118. extern _Unwind_VRS_Result
  119. _Unwind_VRS_Set(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
  120.                 uint32_t regno, _Unwind_VRS_DataRepresentation representation,
  121.                 void *valuep);
  122.  
  123. extern _Unwind_VRS_Result
  124. _Unwind_VRS_Pop(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
  125.                 uint32_t discriminator,
  126.                 _Unwind_VRS_DataRepresentation representation);
  127.  
  128. #if defined(_LIBUNWIND_UNWIND_LEVEL1_EXTERNAL_LINKAGE)
  129. #define _LIBUNWIND_EXPORT_UNWIND_LEVEL1 extern
  130. #else
  131. #define _LIBUNWIND_EXPORT_UNWIND_LEVEL1 static __inline__
  132. #endif
  133.  
  134. // These are de facto helper functions for ARM, which delegate the function
  135. // calls to _Unwind_VRS_Get/Set().  These are not a part of ARM EHABI
  136. // specification, thus these function MUST be inlined.  Please don't replace
  137. // these with the "extern" function declaration; otherwise, the program
  138. // including this <unwind.h> header won't be ABI compatible and will result in
  139. // link error when we are linking the program with libgcc.
  140.  
  141. _LIBUNWIND_EXPORT_UNWIND_LEVEL1
  142. uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, int index) {
  143.   uintptr_t value = 0;
  144.   _Unwind_VRS_Get(context, _UVRSC_CORE, (uint32_t)index, _UVRSD_UINT32, &value);
  145.   return value;
  146. }
  147.  
  148. _LIBUNWIND_EXPORT_UNWIND_LEVEL1
  149. void _Unwind_SetGR(struct _Unwind_Context *context, int index,
  150.                    uintptr_t value) {
  151.   _Unwind_VRS_Set(context, _UVRSC_CORE, (uint32_t)index, _UVRSD_UINT32, &value);
  152. }
  153.  
  154. _LIBUNWIND_EXPORT_UNWIND_LEVEL1
  155. uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
  156.   // remove the thumb-bit before returning
  157.   return _Unwind_GetGR(context, 15) & (~(uintptr_t)0x1);
  158. }
  159.  
  160. _LIBUNWIND_EXPORT_UNWIND_LEVEL1
  161. void _Unwind_SetIP(struct _Unwind_Context *context, uintptr_t value) {
  162.   uintptr_t thumb_bit = _Unwind_GetGR(context, 15) & ((uintptr_t)0x1);
  163.   _Unwind_SetGR(context, 15, value | thumb_bit);
  164. }
  165.  
  166. #ifdef __cplusplus
  167. }
  168. #endif
  169.  
  170. #endif // __ARM_EHABI_UNWIND_H__
  171.