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__) || defined(__ARM_DWARF_EH__)) 66 struct _Unwind_Control_Block; 67 typedef struct _Unwind_Control_Block _Unwind_Exception; /* Alias */ 68 #else 69 struct _Unwind_Exception; 70 typedef struct _Unwind_Exception _Unwind_Exception; 71 #endif 72 typedef enum { 73 _URC_NO_REASON = 0, 74 #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \ 75 !defined(__ARM_DWARF_EH__) 76 _URC_OK = 0, /* used by ARM EHABI */ 77 #endif 78 _URC_FOREIGN_EXCEPTION_CAUGHT = 1, 79 80 _URC_FATAL_PHASE2_ERROR = 2, 81 _URC_FATAL_PHASE1_ERROR = 3, 82 _URC_NORMAL_STOP = 4, 83 84 _URC_END_OF_STACK = 5, 85 _URC_HANDLER_FOUND = 6, 86 _URC_INSTALL_CONTEXT = 7, 87 _URC_CONTINUE_UNWIND = 8, 88 #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \ 89 !defined(__ARM_DWARF_EH__) 90 _URC_FAILURE = 9 /* used by ARM EHABI */ 91 #endif 92 } _Unwind_Reason_Code; 93 94 typedef enum { 95 _UA_SEARCH_PHASE = 1, 96 _UA_CLEANUP_PHASE = 2, 97 98 _UA_HANDLER_FRAME = 4, 99 _UA_FORCE_UNWIND = 8, 100 _UA_END_OF_STACK = 16 /* gcc extension to C++ ABI */ 101 } _Unwind_Action; 102 103 typedef void (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code, 104 _Unwind_Exception *); 105 106 #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH__)) 107 typedef struct _Unwind_Control_Block _Unwind_Control_Block; 108 typedef uint32_t _Unwind_EHT_Header; 109 110 struct _Unwind_Control_Block { 111 uint64_t exception_class; 112 void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *); 113 /* unwinder cache (private fields for the unwinder's use) */ 114 struct { 115 uint32_t reserved1; /* forced unwind stop function, 0 if not forced */ 116 uint32_t reserved2; /* personality routine */ 117 uint32_t reserved3; /* callsite */ 118 uint32_t reserved4; /* forced unwind stop argument */ 119 uint32_t reserved5; 120 } unwinder_cache; 121 /* propagation barrier cache (valid after phase 1) */ 122 struct { 123 uint32_t sp; 124 uint32_t bitpattern[5]; 125 } barrier_cache; 126 /* cleanup cache (preserved over cleanup) */ 127 struct { 128 uint32_t bitpattern[4]; 129 } cleanup_cache; 130 /* personality cache (for personality's benefit) */ 131 struct { 132 uint32_t fnstart; /* function start address */ 133 _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */ 134 uint32_t additional; /* additional data */ 135 uint32_t reserved1; 136 } pr_cache; 137 long long int : 0; /* force alignment of next item to 8-byte boundary */ 138 } __attribute__((__aligned__(8))); 139 #else 140 struct _Unwind_Exception { 141 _Unwind_Exception_Class exception_class; 142 _Unwind_Exception_Cleanup_Fn exception_cleanup; 143 #if !defined (__USING_SJLJ_EXCEPTIONS__) && defined (__SEH__) 144 _Unwind_Word private_[6]; 145 #else 146 _Unwind_Word private_1; 147 _Unwind_Word private_2; 148 #endif 149 /* The Itanium ABI requires that _Unwind_Exception objects are "double-word 150 * aligned". GCC has interpreted this to mean "use the maximum useful 151 * alignment for the target"; so do we. */ 152 } __attribute__((__aligned__)); 153 #endif 154 155 typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)(int, _Unwind_Action, 156 _Unwind_Exception_Class, 157 _Unwind_Exception *, 158 struct _Unwind_Context *, 159 void *); 160 161 typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(int, _Unwind_Action, 162 _Unwind_Exception_Class, 163 _Unwind_Exception *, 164 struct _Unwind_Context *); 165 typedef _Unwind_Personality_Fn __personality_routine; 166 167 typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *, 168 void *); 169 170 #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH__)) 171 typedef enum { 172 _UVRSC_CORE = 0, /* integer register */ 173 _UVRSC_VFP = 1, /* vfp */ 174 _UVRSC_WMMXD = 3, /* Intel WMMX data register */ 175 _UVRSC_WMMXC = 4 /* Intel WMMX control register */ 176 } _Unwind_VRS_RegClass; 177 178 typedef enum { 179 _UVRSD_UINT32 = 0, 180 _UVRSD_VFPX = 1, 181 _UVRSD_UINT64 = 3, 182 _UVRSD_FLOAT = 4, 183 _UVRSD_DOUBLE = 5 184 } _Unwind_VRS_DataRepresentation; 185 186 typedef enum { 187 _UVRSR_OK = 0, 188 _UVRSR_NOT_IMPLEMENTED = 1, 189 _UVRSR_FAILED = 2 190 } _Unwind_VRS_Result; 191 192 typedef uint32_t _Unwind_State; 193 #define _US_VIRTUAL_UNWIND_FRAME ((_Unwind_State)0) 194 #define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1) 195 #define _US_UNWIND_FRAME_RESUME ((_Unwind_State)2) 196 #define _US_ACTION_MASK ((_Unwind_State)3) 197 #define _US_FORCE_UNWIND ((_Unwind_State)8) 198 199 _Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context, 200 _Unwind_VRS_RegClass __regclass, 201 uint32_t __regno, 202 _Unwind_VRS_DataRepresentation __representation, 203 void *__valuep); 204 205 _Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *__context, 206 _Unwind_VRS_RegClass __regclass, 207 uint32_t __regno, 208 _Unwind_VRS_DataRepresentation __representation, 209 void *__valuep); 210 211 static __inline__ 212 _Unwind_Word _Unwind_GetGR(struct _Unwind_Context *__context, int __index) { 213 _Unwind_Word __value; 214 _Unwind_VRS_Get(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value); 215 return __value; 216 } 217 218 static __inline__ 219 void _Unwind_SetGR(struct _Unwind_Context *__context, int __index, 220 _Unwind_Word __value) { 221 _Unwind_VRS_Set(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value); 222 } 223 224 static __inline__ 225 _Unwind_Word _Unwind_GetIP(struct _Unwind_Context *__context) { 226 _Unwind_Word __ip = _Unwind_GetGR(__context, 15); 227 return __ip & ~(_Unwind_Word)(0x1); /* Remove thumb mode bit. */ 228 } 229 230 static __inline__ 231 void _Unwind_SetIP(struct _Unwind_Context *__context, _Unwind_Word __value) { 232 _Unwind_Word __thumb_mode_bit = _Unwind_GetGR(__context, 15) & 0x1; 233 _Unwind_SetGR(__context, 15, __value | __thumb_mode_bit); 234 } 235 #else 236 _Unwind_Word _Unwind_GetGR(struct _Unwind_Context *, int); 237 void _Unwind_SetGR(struct _Unwind_Context *, int, _Unwind_Word); 238 239 _Unwind_Word _Unwind_GetIP(struct _Unwind_Context *); 240 void _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Word); 241 #endif 242 243 244 _Unwind_Word _Unwind_GetIPInfo(struct _Unwind_Context *, int *); 245 246 _Unwind_Word _Unwind_GetCFA(struct _Unwind_Context *); 247 248 _Unwind_Word _Unwind_GetBSP(struct _Unwind_Context *); 249 250 void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *); 251 252 _Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *); 253 254 /* DWARF EH functions; currently not available on Darwin/ARM */ 255 #if !defined(__APPLE__) || !defined(__arm__) 256 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception *); 257 _Unwind_Reason_Code _Unwind_ForcedUnwind(_Unwind_Exception *, _Unwind_Stop_Fn, 258 void *); 259 void _Unwind_DeleteException(_Unwind_Exception *); 260 void _Unwind_Resume(_Unwind_Exception *); 261 _Unwind_Reason_Code _Unwind_Resume_or_Rethrow(_Unwind_Exception *); 262 263 #endif 264 265 _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *); 266 267 /* setjmp(3)/longjmp(3) stuff */ 268 typedef struct SjLj_Function_Context *_Unwind_FunctionContext_t; 269 270 void _Unwind_SjLj_Register(_Unwind_FunctionContext_t); 271 void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t); 272 _Unwind_Reason_Code _Unwind_SjLj_RaiseException(_Unwind_Exception *); 273 _Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(_Unwind_Exception *, 274 _Unwind_Stop_Fn, void *); 275 void _Unwind_SjLj_Resume(_Unwind_Exception *); 276 _Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *); 277 278 void *_Unwind_FindEnclosingFunction(void *); 279 280 #ifdef __APPLE__ 281 282 _Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *) 283 __attribute__((__unavailable__)); 284 _Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *) 285 __attribute__((__unavailable__)); 286 287 /* Darwin-specific functions */ 288 void __register_frame(const void *); 289 void __deregister_frame(const void *); 290 291 struct dwarf_eh_bases { 292 uintptr_t tbase; 293 uintptr_t dbase; 294 uintptr_t func; 295 }; 296 void *_Unwind_Find_FDE(const void *, struct dwarf_eh_bases *); 297 298 void __register_frame_info_bases(const void *, void *, void *, void *) 299 __attribute__((__unavailable__)); 300 void __register_frame_info(const void *, void *) __attribute__((__unavailable__)); 301 void __register_frame_info_table_bases(const void *, void*, void *, void *) 302 __attribute__((__unavailable__)); 303 void __register_frame_info_table(const void *, void *) 304 __attribute__((__unavailable__)); 305 void __register_frame_table(const void *) __attribute__((__unavailable__)); 306 void __deregister_frame_info(const void *) __attribute__((__unavailable__)); 307 void __deregister_frame_info_bases(const void *)__attribute__((__unavailable__)); 308 309 #else 310 311 _Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *); 312 _Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *); 313 314 #endif 315 316 317 #ifndef HIDE_EXPORTS 318 #pragma GCC visibility pop 319 #endif 320 321 #ifdef __cplusplus 322 } 323 #endif 324 325 #endif 326 327 #endif /* __CLANG_UNWIND_H */ 328