1 /*===---- unwind.h - Stack unwinding ----------------------------------------=== 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 */ 9 10 /* See "Data Definitions for libgcc_s" in the Linux Standard Base.*/ 11 12 #ifndef __CLANG_UNWIND_H 13 #define __CLANG_UNWIND_H 14 15 #if defined(__APPLE__) && __has_include_next(<unwind.h>) 16 /* Darwin (from 11.x on) provide an unwind.h. If that's available, 17 * use it. libunwind wraps some of its definitions in #ifdef _GNU_SOURCE, 18 * so define that around the include.*/ 19 # ifndef _GNU_SOURCE 20 # define _SHOULD_UNDEFINE_GNU_SOURCE 21 # define _GNU_SOURCE 22 # endif 23 // libunwind's unwind.h reflects the current visibility. However, Mozilla 24 // builds with -fvisibility=hidden and relies on gcc's unwind.h to reset the 25 // visibility to default and export its contents. gcc also allows users to 26 // override its override by #defining HIDE_EXPORTS (but note, this only obeys 27 // the user's -fvisibility setting; it doesn't hide any exports on its own). We 28 // imitate gcc's header here: 29 # ifdef HIDE_EXPORTS 30 # include_next <unwind.h> 31 # else 32 # pragma GCC visibility push(default) 33 # include_next <unwind.h> 34 # pragma GCC visibility pop 35 # endif 36 # ifdef _SHOULD_UNDEFINE_GNU_SOURCE 37 # undef _GNU_SOURCE 38 # undef _SHOULD_UNDEFINE_GNU_SOURCE 39 # endif 40 #else 41 42 #include <stdint.h> 43 44 #ifdef __cplusplus 45 extern "C" { 46 #endif 47 48 /* It is a bit strange for a header to play with the visibility of the 49 symbols it declares, but this matches gcc's behavior and some programs 50 depend on it */ 51 #ifndef HIDE_EXPORTS 52 #pragma GCC visibility push(default) 53 #endif 54 55 typedef uintptr_t _Unwind_Word __attribute__((__mode__(__unwind_word__))); 56 typedef intptr_t _Unwind_Sword __attribute__((__mode__(__unwind_word__))); 57 typedef uintptr_t _Unwind_Ptr; 58 typedef uintptr_t _Unwind_Internal_Ptr; 59 typedef uint64_t _Unwind_Exception_Class; 60 61 typedef intptr_t _sleb128_t; 62 typedef uintptr_t _uleb128_t; 63 64 struct _Unwind_Context; 65 #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || \ 66 defined(__ARM_DWARF_EH__) || defined(__SEH__)) 67 struct _Unwind_Control_Block; 68 typedef struct _Unwind_Control_Block _Unwind_Control_Block; 69 #define _Unwind_Exception _Unwind_Control_Block /* Alias */ 70 #else 71 struct _Unwind_Exception; 72 typedef struct _Unwind_Exception _Unwind_Exception; 73 #endif 74 typedef enum { 75 _URC_NO_REASON = 0, 76 #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \ 77 !defined(__ARM_DWARF_EH__) && !defined(__SEH__) 78 _URC_OK = 0, /* used by ARM EHABI */ 79 #endif 80 _URC_FOREIGN_EXCEPTION_CAUGHT = 1, 81 82 _URC_FATAL_PHASE2_ERROR = 2, 83 _URC_FATAL_PHASE1_ERROR = 3, 84 _URC_NORMAL_STOP = 4, 85 86 _URC_END_OF_STACK = 5, 87 _URC_HANDLER_FOUND = 6, 88 _URC_INSTALL_CONTEXT = 7, 89 _URC_CONTINUE_UNWIND = 8, 90 #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \ 91 !defined(__ARM_DWARF_EH__) && !defined(__SEH__) 92 _URC_FAILURE = 9 /* used by ARM EHABI */ 93 #endif 94 } _Unwind_Reason_Code; 95 96 typedef enum { 97 _UA_SEARCH_PHASE = 1, 98 _UA_CLEANUP_PHASE = 2, 99 100 _UA_HANDLER_FRAME = 4, 101 _UA_FORCE_UNWIND = 8, 102 _UA_END_OF_STACK = 16 /* gcc extension to C++ ABI */ 103 } _Unwind_Action; 104 105 typedef void (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code, 106 _Unwind_Exception *); 107 108 #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || \ 109 defined(__ARM_DWARF_EH__) || defined(__SEH__)) 110 typedef struct _Unwind_Control_Block _Unwind_Control_Block; 111 typedef uint32_t _Unwind_EHT_Header; 112 113 struct _Unwind_Control_Block { 114 uint64_t exception_class; 115 void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *); 116 /* unwinder cache (private fields for the unwinder's use) */ 117 struct { 118 uint32_t reserved1; /* forced unwind stop function, 0 if not forced */ 119 uint32_t reserved2; /* personality routine */ 120 uint32_t reserved3; /* callsite */ 121 uint32_t reserved4; /* forced unwind stop argument */ 122 uint32_t reserved5; 123 } unwinder_cache; 124 /* propagation barrier cache (valid after phase 1) */ 125 struct { 126 uint32_t sp; 127 uint32_t bitpattern[5]; 128 } barrier_cache; 129 /* cleanup cache (preserved over cleanup) */ 130 struct { 131 uint32_t bitpattern[4]; 132 } cleanup_cache; 133 /* personality cache (for personality's benefit) */ 134 struct { 135 uint32_t fnstart; /* function start address */ 136 _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */ 137 uint32_t additional; /* additional data */ 138 uint32_t reserved1; 139 } pr_cache; 140 long long int : 0; /* force alignment of next item to 8-byte boundary */ 141 } __attribute__((__aligned__(8))); 142 #else 143 struct _Unwind_Exception { 144 _Unwind_Exception_Class exception_class; 145 _Unwind_Exception_Cleanup_Fn exception_cleanup; 146 #if !defined (__USING_SJLJ_EXCEPTIONS__) && defined (__SEH__) 147 _Unwind_Word private_[6]; 148 #else 149 _Unwind_Word private_1; 150 _Unwind_Word private_2; 151 #endif 152 /* The Itanium ABI requires that _Unwind_Exception objects are "double-word 153 * aligned". GCC has interpreted this to mean "use the maximum useful 154 * alignment for the target"; so do we. */ 155 } __attribute__((__aligned__)); 156 #endif 157 158 typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)(int, _Unwind_Action, 159 _Unwind_Exception_Class, 160 _Unwind_Exception *, 161 struct _Unwind_Context *, 162 void *); 163 164 typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(int, _Unwind_Action, 165 _Unwind_Exception_Class, 166 _Unwind_Exception *, 167 struct _Unwind_Context *); 168 typedef _Unwind_Personality_Fn __personality_routine; 169 170 typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *, 171 void *); 172 173 #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || \ 174 defined(__ARM_DWARF_EH__) || defined(__SEH__)) 175 typedef enum { 176 _UVRSC_CORE = 0, /* integer register */ 177 _UVRSC_VFP = 1, /* vfp */ 178 _UVRSC_WMMXD = 3, /* Intel WMMX data register */ 179 _UVRSC_WMMXC = 4, /* Intel WMMX control register */ 180 _UVRSC_PSEUDO = 5 /* Special purpose pseudo register */ 181 } _Unwind_VRS_RegClass; 182 183 typedef enum { 184 _UVRSD_UINT32 = 0, 185 _UVRSD_VFPX = 1, 186 _UVRSD_UINT64 = 3, 187 _UVRSD_FLOAT = 4, 188 _UVRSD_DOUBLE = 5 189 } _Unwind_VRS_DataRepresentation; 190 191 typedef enum { 192 _UVRSR_OK = 0, 193 _UVRSR_NOT_IMPLEMENTED = 1, 194 _UVRSR_FAILED = 2 195 } _Unwind_VRS_Result; 196 197 typedef uint32_t _Unwind_State; 198 #define _US_VIRTUAL_UNWIND_FRAME ((_Unwind_State)0) 199 #define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1) 200 #define _US_UNWIND_FRAME_RESUME ((_Unwind_State)2) 201 #define _US_ACTION_MASK ((_Unwind_State)3) 202 #define _US_FORCE_UNWIND ((_Unwind_State)8) 203 204 _Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context, 205 _Unwind_VRS_RegClass __regclass, 206 uint32_t __regno, 207 _Unwind_VRS_DataRepresentation __representation, 208 void *__valuep); 209 210 _Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *__context, 211 _Unwind_VRS_RegClass __regclass, 212 uint32_t __regno, 213 _Unwind_VRS_DataRepresentation __representation, 214 void *__valuep); 215 216 static __inline__ 217 _Unwind_Word _Unwind_GetGR(struct _Unwind_Context *__context, int __index) { 218 _Unwind_Word __value; 219 _Unwind_VRS_Get(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value); 220 return __value; 221 } 222 223 static __inline__ 224 void _Unwind_SetGR(struct _Unwind_Context *__context, int __index, 225 _Unwind_Word __value) { 226 _Unwind_VRS_Set(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value); 227 } 228 229 static __inline__ 230 _Unwind_Word _Unwind_GetIP(struct _Unwind_Context *__context) { 231 _Unwind_Word __ip = _Unwind_GetGR(__context, 15); 232 return __ip & ~(_Unwind_Word)(0x1); /* Remove thumb mode bit. */ 233 } 234 235 static __inline__ 236 void _Unwind_SetIP(struct _Unwind_Context *__context, _Unwind_Word __value) { 237 _Unwind_Word __thumb_mode_bit = _Unwind_GetGR(__context, 15) & 0x1; 238 _Unwind_SetGR(__context, 15, __value | __thumb_mode_bit); 239 } 240 #else 241 _Unwind_Word _Unwind_GetGR(struct _Unwind_Context *, int); 242 void _Unwind_SetGR(struct _Unwind_Context *, int, _Unwind_Word); 243 244 _Unwind_Word _Unwind_GetIP(struct _Unwind_Context *); 245 void _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Word); 246 #endif 247 248 249 _Unwind_Word _Unwind_GetIPInfo(struct _Unwind_Context *, int *); 250 251 _Unwind_Word _Unwind_GetCFA(struct _Unwind_Context *); 252 253 _Unwind_Word _Unwind_GetBSP(struct _Unwind_Context *); 254 255 void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *); 256 257 _Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *); 258 259 /* DWARF EH functions; currently not available on Darwin/ARM */ 260 #if !defined(__APPLE__) || !defined(__arm__) 261 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception *); 262 _Unwind_Reason_Code _Unwind_ForcedUnwind(_Unwind_Exception *, _Unwind_Stop_Fn, 263 void *); 264 void _Unwind_DeleteException(_Unwind_Exception *); 265 void _Unwind_Resume(_Unwind_Exception *); 266 _Unwind_Reason_Code _Unwind_Resume_or_Rethrow(_Unwind_Exception *); 267 268 #endif 269 270 _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *); 271 272 /* setjmp(3)/longjmp(3) stuff */ 273 typedef struct SjLj_Function_Context *_Unwind_FunctionContext_t; 274 275 void _Unwind_SjLj_Register(_Unwind_FunctionContext_t); 276 void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t); 277 _Unwind_Reason_Code _Unwind_SjLj_RaiseException(_Unwind_Exception *); 278 _Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(_Unwind_Exception *, 279 _Unwind_Stop_Fn, void *); 280 void _Unwind_SjLj_Resume(_Unwind_Exception *); 281 _Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *); 282 283 void *_Unwind_FindEnclosingFunction(void *); 284 285 #ifdef __APPLE__ 286 287 _Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *) 288 __attribute__((__unavailable__)); 289 _Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *) 290 __attribute__((__unavailable__)); 291 292 /* Darwin-specific functions */ 293 void __register_frame(const void *); 294 void __deregister_frame(const void *); 295 296 struct dwarf_eh_bases { 297 uintptr_t tbase; 298 uintptr_t dbase; 299 uintptr_t func; 300 }; 301 void *_Unwind_Find_FDE(const void *, struct dwarf_eh_bases *); 302 303 void __register_frame_info_bases(const void *, void *, void *, void *) 304 __attribute__((__unavailable__)); 305 void __register_frame_info(const void *, void *) __attribute__((__unavailable__)); 306 void __register_frame_info_table_bases(const void *, void*, void *, void *) 307 __attribute__((__unavailable__)); 308 void __register_frame_info_table(const void *, void *) 309 __attribute__((__unavailable__)); 310 void __register_frame_table(const void *) __attribute__((__unavailable__)); 311 void __deregister_frame_info(const void *) __attribute__((__unavailable__)); 312 void __deregister_frame_info_bases(const void *)__attribute__((__unavailable__)); 313 314 #else 315 316 _Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *); 317 _Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *); 318 319 #endif 320 321 322 #ifndef HIDE_EXPORTS 323 #pragma GCC visibility pop 324 #endif 325 326 #ifdef __cplusplus 327 } 328 #endif 329 330 #endif 331 332 #endif /* __CLANG_UNWIND_H */ 333