1 //===--------------------------- Unwind-seh.cpp ---------------------------===// 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 // Implements SEH-based Itanium C++ exceptions. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "config.h" 14 15 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 16 17 #include <unwind.h> 18 19 #include <stdint.h> 20 #include <stdbool.h> 21 #include <stdlib.h> 22 23 #include <windef.h> 24 #include <excpt.h> 25 #include <winnt.h> 26 #include <ntstatus.h> 27 28 #include "libunwind_ext.h" 29 #include "UnwindCursor.hpp" 30 31 using namespace libunwind; 32 33 #define STATUS_USER_DEFINED (1u << 29) 34 35 #define STATUS_GCC_MAGIC (('G' << 16) | ('C' << 8) | 'C') 36 37 #define MAKE_CUSTOM_STATUS(s, c) \ 38 ((NTSTATUS)(((s) << 30) | STATUS_USER_DEFINED | (c))) 39 #define MAKE_GCC_EXCEPTION(c) \ 40 MAKE_CUSTOM_STATUS(STATUS_SEVERITY_SUCCESS, STATUS_GCC_MAGIC | ((c) << 24)) 41 42 /// SEH exception raised by libunwind when the program calls 43 /// \c _Unwind_RaiseException. 44 #define STATUS_GCC_THROW MAKE_GCC_EXCEPTION(0) // 0x20474343 45 /// SEH exception raised by libunwind to initiate phase 2 of exception 46 /// handling. 47 #define STATUS_GCC_UNWIND MAKE_GCC_EXCEPTION(1) // 0x21474343 48 49 static int __unw_init_seh(unw_cursor_t *cursor, CONTEXT *ctx); 50 static DISPATCHER_CONTEXT *__unw_seh_get_disp_ctx(unw_cursor_t *cursor); 51 static void __unw_seh_set_disp_ctx(unw_cursor_t *cursor, 52 DISPATCHER_CONTEXT *disp); 53 54 /// Common implementation of SEH-style handler functions used by Itanium- 55 /// style frames. Depending on how and why it was called, it may do one of: 56 /// a) Delegate to the given Itanium-style personality function; or 57 /// b) Initiate a collided unwind to halt unwinding. 58 _LIBUNWIND_EXPORT EXCEPTION_DISPOSITION 59 _GCC_specific_handler(PEXCEPTION_RECORD ms_exc, PVOID frame, PCONTEXT ms_ctx, 60 DISPATCHER_CONTEXT *disp, _Unwind_Personality_Fn pers) { 61 unw_cursor_t cursor; 62 _Unwind_Exception *exc; 63 _Unwind_Action action; 64 struct _Unwind_Context *ctx = nullptr; 65 _Unwind_Reason_Code urc; 66 uintptr_t retval, target; 67 bool ours = false; 68 69 _LIBUNWIND_TRACE_UNWINDING("_GCC_specific_handler(%#010lx(%lx), %p)", 70 ms_exc->ExceptionCode, ms_exc->ExceptionFlags, 71 (void *)frame); 72 if (ms_exc->ExceptionCode == STATUS_GCC_UNWIND) { 73 if (IS_TARGET_UNWIND(ms_exc->ExceptionFlags)) { 74 // Set up the upper return value (the lower one and the target PC 75 // were set in the call to RtlUnwindEx()) for the landing pad. 76 #ifdef __x86_64__ 77 disp->ContextRecord->Rdx = ms_exc->ExceptionInformation[3]; 78 #elif defined(__arm__) 79 disp->ContextRecord->R1 = ms_exc->ExceptionInformation[3]; 80 #elif defined(__aarch64__) 81 disp->ContextRecord->X1 = ms_exc->ExceptionInformation[3]; 82 #endif 83 } 84 // This is the collided unwind to the landing pad. Nothing to do. 85 return ExceptionContinueSearch; 86 } 87 88 if (ms_exc->ExceptionCode == STATUS_GCC_THROW) { 89 // This is (probably) a libunwind-controlled exception/unwind. Recover the 90 // parameters which we set below, and pass them to the personality function. 91 ours = true; 92 exc = (_Unwind_Exception *)ms_exc->ExceptionInformation[0]; 93 if (!IS_UNWINDING(ms_exc->ExceptionFlags) && ms_exc->NumberParameters > 1) { 94 ctx = (struct _Unwind_Context *)ms_exc->ExceptionInformation[1]; 95 action = (_Unwind_Action)ms_exc->ExceptionInformation[2]; 96 } 97 } else { 98 // Foreign exception. 99 // We can't interact with them (we don't know the original target frame 100 // that we should pass on to RtlUnwindEx in _Unwind_Resume), so just 101 // pass without calling our destructors here. 102 return ExceptionContinueSearch; 103 } 104 if (!ctx) { 105 __unw_init_seh(&cursor, disp->ContextRecord); 106 __unw_seh_set_disp_ctx(&cursor, disp); 107 __unw_set_reg(&cursor, UNW_REG_IP, disp->ControlPc - 1); 108 ctx = (struct _Unwind_Context *)&cursor; 109 110 if (!IS_UNWINDING(ms_exc->ExceptionFlags)) { 111 if (ours && ms_exc->NumberParameters > 1) 112 action = (_Unwind_Action)(_UA_CLEANUP_PHASE | _UA_FORCE_UNWIND); 113 else 114 action = _UA_SEARCH_PHASE; 115 } else { 116 if (ours && ms_exc->ExceptionInformation[1] == (ULONG_PTR)frame) 117 action = (_Unwind_Action)(_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME); 118 else 119 action = _UA_CLEANUP_PHASE; 120 } 121 } 122 123 _LIBUNWIND_TRACE_UNWINDING("_GCC_specific_handler() calling personality " 124 "function %p(1, %d, %llx, %p, %p)", 125 (void *)pers, action, exc->exception_class, 126 (void *)exc, (void *)ctx); 127 urc = pers(1, action, exc->exception_class, exc, ctx); 128 _LIBUNWIND_TRACE_UNWINDING("_GCC_specific_handler() personality returned %d", urc); 129 switch (urc) { 130 case _URC_CONTINUE_UNWIND: 131 // If we're in phase 2, and the personality routine said to continue 132 // at the target frame, we're in real trouble. 133 if (action & _UA_HANDLER_FRAME) 134 _LIBUNWIND_ABORT("Personality continued unwind at the target frame!"); 135 return ExceptionContinueSearch; 136 case _URC_HANDLER_FOUND: 137 // If we were called by __libunwind_seh_personality(), indicate that 138 // a handler was found; otherwise, initiate phase 2 by unwinding. 139 if (ours && ms_exc->NumberParameters > 1) 140 return 4 /* ExecptionExecuteHandler in mingw */; 141 // This should never happen in phase 2. 142 if (IS_UNWINDING(ms_exc->ExceptionFlags)) 143 _LIBUNWIND_ABORT("Personality indicated exception handler in phase 2!"); 144 exc->private_[1] = (ULONG_PTR)frame; 145 if (ours) { 146 ms_exc->NumberParameters = 4; 147 ms_exc->ExceptionInformation[1] = (ULONG_PTR)frame; 148 } 149 // FIXME: Indicate target frame in foreign case! 150 // phase 2: the clean up phase 151 RtlUnwindEx(frame, (PVOID)disp->ControlPc, ms_exc, exc, ms_ctx, disp->HistoryTable); 152 _LIBUNWIND_ABORT("RtlUnwindEx() failed"); 153 case _URC_INSTALL_CONTEXT: { 154 // If we were called by __libunwind_seh_personality(), indicate that 155 // a handler was found; otherwise, it's time to initiate a collided 156 // unwind to the target. 157 if (ours && !IS_UNWINDING(ms_exc->ExceptionFlags) && ms_exc->NumberParameters > 1) 158 return 4 /* ExecptionExecuteHandler in mingw */; 159 // This should never happen in phase 1. 160 if (!IS_UNWINDING(ms_exc->ExceptionFlags)) 161 _LIBUNWIND_ABORT("Personality installed context during phase 1!"); 162 #ifdef __x86_64__ 163 exc->private_[2] = disp->TargetIp; 164 __unw_get_reg(&cursor, UNW_X86_64_RAX, &retval); 165 __unw_get_reg(&cursor, UNW_X86_64_RDX, &exc->private_[3]); 166 #elif defined(__arm__) 167 exc->private_[2] = disp->TargetPc; 168 __unw_get_reg(&cursor, UNW_ARM_R0, &retval); 169 __unw_get_reg(&cursor, UNW_ARM_R1, &exc->private_[3]); 170 #elif defined(__aarch64__) 171 exc->private_[2] = disp->TargetPc; 172 __unw_get_reg(&cursor, UNW_ARM64_X0, &retval); 173 __unw_get_reg(&cursor, UNW_ARM64_X1, &exc->private_[3]); 174 #endif 175 __unw_get_reg(&cursor, UNW_REG_IP, &target); 176 ms_exc->ExceptionCode = STATUS_GCC_UNWIND; 177 #ifdef __x86_64__ 178 ms_exc->ExceptionInformation[2] = disp->TargetIp; 179 #elif defined(__arm__) || defined(__aarch64__) 180 ms_exc->ExceptionInformation[2] = disp->TargetPc; 181 #endif 182 ms_exc->ExceptionInformation[3] = exc->private_[3]; 183 // Give NTRTL some scratch space to keep track of the collided unwind. 184 // Don't use the one that was passed in; we don't want to overwrite the 185 // context in the DISPATCHER_CONTEXT. 186 CONTEXT new_ctx; 187 RtlUnwindEx(frame, (PVOID)target, ms_exc, (PVOID)retval, &new_ctx, disp->HistoryTable); 188 _LIBUNWIND_ABORT("RtlUnwindEx() failed"); 189 } 190 // Anything else indicates a serious problem. 191 default: return ExceptionContinueExecution; 192 } 193 } 194 195 /// Personality function returned by \c __unw_get_proc_info() in SEH contexts. 196 /// This is a wrapper that calls the real SEH handler function, which in 197 /// turn (at least, for Itanium-style frames) calls the real Itanium 198 /// personality function (see \c _GCC_specific_handler()). 199 extern "C" _Unwind_Reason_Code 200 __libunwind_seh_personality(int version, _Unwind_Action state, 201 uint64_t klass, _Unwind_Exception *exc, 202 struct _Unwind_Context *context) { 203 (void)version; 204 (void)klass; 205 EXCEPTION_RECORD ms_exc; 206 bool phase2 = (state & (_UA_SEARCH_PHASE|_UA_CLEANUP_PHASE)) == _UA_CLEANUP_PHASE; 207 ms_exc.ExceptionCode = STATUS_GCC_THROW; 208 ms_exc.ExceptionFlags = 0; 209 ms_exc.NumberParameters = 3; 210 ms_exc.ExceptionInformation[0] = (ULONG_PTR)exc; 211 ms_exc.ExceptionInformation[1] = (ULONG_PTR)context; 212 ms_exc.ExceptionInformation[2] = state; 213 DISPATCHER_CONTEXT *disp_ctx = 214 __unw_seh_get_disp_ctx((unw_cursor_t *)context); 215 EXCEPTION_DISPOSITION ms_act = disp_ctx->LanguageHandler(&ms_exc, 216 (PVOID)disp_ctx->EstablisherFrame, 217 disp_ctx->ContextRecord, 218 disp_ctx); 219 switch (ms_act) { 220 case ExceptionContinueSearch: return _URC_CONTINUE_UNWIND; 221 case 4 /*ExceptionExecuteHandler*/: 222 return phase2 ? _URC_INSTALL_CONTEXT : _URC_HANDLER_FOUND; 223 default: 224 return phase2 ? _URC_FATAL_PHASE2_ERROR : _URC_FATAL_PHASE1_ERROR; 225 } 226 } 227 228 static _Unwind_Reason_Code 229 unwind_phase2_forced(unw_context_t *uc, 230 _Unwind_Exception *exception_object, 231 _Unwind_Stop_Fn stop, void *stop_parameter) { 232 unw_cursor_t cursor2; 233 __unw_init_local(&cursor2, uc); 234 235 // Walk each frame until we reach where search phase said to stop 236 while (__unw_step(&cursor2) > 0) { 237 238 // Update info about this frame. 239 unw_proc_info_t frameInfo; 240 if (__unw_get_proc_info(&cursor2, &frameInfo) != UNW_ESUCCESS) { 241 _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): __unw_step " 242 "failed => _URC_END_OF_STACK", 243 (void *)exception_object); 244 return _URC_FATAL_PHASE2_ERROR; 245 } 246 247 // When tracing, print state information. 248 if (_LIBUNWIND_TRACING_UNWINDING) { 249 char functionBuf[512]; 250 const char *functionName = functionBuf; 251 unw_word_t offset; 252 if ((__unw_get_proc_name(&cursor2, functionBuf, sizeof(functionBuf), 253 &offset) != UNW_ESUCCESS) || 254 (frameInfo.start_ip + offset > frameInfo.end_ip)) 255 functionName = ".anonymous."; 256 _LIBUNWIND_TRACE_UNWINDING( 257 "unwind_phase2_forced(ex_ojb=%p): start_ip=0x%" PRIx64 258 ", func=%s, lsda=0x%" PRIx64 ", personality=0x%" PRIx64, 259 (void *)exception_object, frameInfo.start_ip, functionName, 260 frameInfo.lsda, frameInfo.handler); 261 } 262 263 // Call stop function at each frame. 264 _Unwind_Action action = 265 (_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE); 266 _Unwind_Reason_Code stopResult = 267 (*stop)(1, action, exception_object->exception_class, exception_object, 268 (struct _Unwind_Context *)(&cursor2), stop_parameter); 269 _LIBUNWIND_TRACE_UNWINDING( 270 "unwind_phase2_forced(ex_ojb=%p): stop function returned %d", 271 (void *)exception_object, stopResult); 272 if (stopResult != _URC_NO_REASON) { 273 _LIBUNWIND_TRACE_UNWINDING( 274 "unwind_phase2_forced(ex_ojb=%p): stopped by stop function", 275 (void *)exception_object); 276 return _URC_FATAL_PHASE2_ERROR; 277 } 278 279 // If there is a personality routine, tell it we are unwinding. 280 if (frameInfo.handler != 0) { 281 _Unwind_Personality_Fn p = 282 (_Unwind_Personality_Fn)(intptr_t)(frameInfo.handler); 283 _LIBUNWIND_TRACE_UNWINDING( 284 "unwind_phase2_forced(ex_ojb=%p): calling personality function %p", 285 (void *)exception_object, (void *)(uintptr_t)p); 286 _Unwind_Reason_Code personalityResult = 287 (*p)(1, action, exception_object->exception_class, exception_object, 288 (struct _Unwind_Context *)(&cursor2)); 289 switch (personalityResult) { 290 case _URC_CONTINUE_UNWIND: 291 _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 292 "personality returned " 293 "_URC_CONTINUE_UNWIND", 294 (void *)exception_object); 295 // Destructors called, continue unwinding 296 break; 297 case _URC_INSTALL_CONTEXT: 298 _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 299 "personality returned " 300 "_URC_INSTALL_CONTEXT", 301 (void *)exception_object); 302 // We may get control back if landing pad calls _Unwind_Resume(). 303 __unw_resume(&cursor2); 304 break; 305 default: 306 // Personality routine returned an unknown result code. 307 _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 308 "personality returned %d, " 309 "_URC_FATAL_PHASE2_ERROR", 310 (void *)exception_object, personalityResult); 311 return _URC_FATAL_PHASE2_ERROR; 312 } 313 } 314 } 315 316 // Call stop function one last time and tell it we've reached the end 317 // of the stack. 318 _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): calling stop " 319 "function with _UA_END_OF_STACK", 320 (void *)exception_object); 321 _Unwind_Action lastAction = 322 (_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE | _UA_END_OF_STACK); 323 (*stop)(1, lastAction, exception_object->exception_class, exception_object, 324 (struct _Unwind_Context *)(&cursor2), stop_parameter); 325 326 // Clean up phase did not resume at the frame that the search phase said it 327 // would. 328 return _URC_FATAL_PHASE2_ERROR; 329 } 330 331 /// Called by \c __cxa_throw(). Only returns if there is a fatal error. 332 _LIBUNWIND_EXPORT _Unwind_Reason_Code 333 _Unwind_RaiseException(_Unwind_Exception *exception_object) { 334 _LIBUNWIND_TRACE_API("_Unwind_RaiseException(ex_obj=%p)", 335 (void *)exception_object); 336 337 // Mark that this is a non-forced unwind, so _Unwind_Resume() 338 // can do the right thing. 339 memset(exception_object->private_, 0, sizeof(exception_object->private_)); 340 341 // phase 1: the search phase 342 // We'll let the system do that for us. 343 RaiseException(STATUS_GCC_THROW, 0, 1, (ULONG_PTR *)&exception_object); 344 345 // If we get here, either something went horribly wrong or we reached the 346 // top of the stack. Either way, let libc++abi call std::terminate(). 347 return _URC_END_OF_STACK; 348 } 349 350 /// When \c _Unwind_RaiseException() is in phase2, it hands control 351 /// to the personality function at each frame. The personality 352 /// may force a jump to a landing pad in that function; the landing 353 /// pad code may then call \c _Unwind_Resume() to continue with the 354 /// unwinding. Note: the call to \c _Unwind_Resume() is from compiler 355 /// geneated user code. All other \c _Unwind_* routines are called 356 /// by the C++ runtime \c __cxa_* routines. 357 /// 358 /// Note: re-throwing an exception (as opposed to continuing the unwind) 359 /// is implemented by having the code call \c __cxa_rethrow() which 360 /// in turn calls \c _Unwind_Resume_or_Rethrow(). 361 _LIBUNWIND_EXPORT void 362 _Unwind_Resume(_Unwind_Exception *exception_object) { 363 _LIBUNWIND_TRACE_API("_Unwind_Resume(ex_obj=%p)", (void *)exception_object); 364 365 if (exception_object->private_[0] != 0) { 366 unw_context_t uc; 367 368 __unw_getcontext(&uc); 369 unwind_phase2_forced(&uc, exception_object, 370 (_Unwind_Stop_Fn) exception_object->private_[0], 371 (void *)exception_object->private_[4]); 372 } else { 373 // Recover the parameters for the unwind from the exception object 374 // so we can start unwinding again. 375 EXCEPTION_RECORD ms_exc; 376 CONTEXT ms_ctx; 377 UNWIND_HISTORY_TABLE hist; 378 379 memset(&ms_exc, 0, sizeof(ms_exc)); 380 memset(&hist, 0, sizeof(hist)); 381 ms_exc.ExceptionCode = STATUS_GCC_THROW; 382 ms_exc.ExceptionFlags = EXCEPTION_NONCONTINUABLE; 383 ms_exc.NumberParameters = 4; 384 ms_exc.ExceptionInformation[0] = (ULONG_PTR)exception_object; 385 ms_exc.ExceptionInformation[1] = exception_object->private_[1]; 386 ms_exc.ExceptionInformation[2] = exception_object->private_[2]; 387 ms_exc.ExceptionInformation[3] = exception_object->private_[3]; 388 RtlUnwindEx((PVOID)exception_object->private_[1], 389 (PVOID)exception_object->private_[2], &ms_exc, 390 exception_object, &ms_ctx, &hist); 391 } 392 393 // Clients assume _Unwind_Resume() does not return, so all we can do is abort. 394 _LIBUNWIND_ABORT("_Unwind_Resume() can't return"); 395 } 396 397 /// Not used by C++. 398 /// Unwinds stack, calling "stop" function at each frame. 399 /// Could be used to implement \c longjmp(). 400 _LIBUNWIND_EXPORT _Unwind_Reason_Code 401 _Unwind_ForcedUnwind(_Unwind_Exception *exception_object, 402 _Unwind_Stop_Fn stop, void *stop_parameter) { 403 _LIBUNWIND_TRACE_API("_Unwind_ForcedUnwind(ex_obj=%p, stop=%p)", 404 (void *)exception_object, (void *)(uintptr_t)stop); 405 unw_context_t uc; 406 __unw_getcontext(&uc); 407 408 // Mark that this is a forced unwind, so _Unwind_Resume() can do 409 // the right thing. 410 exception_object->private_[0] = (uintptr_t) stop; 411 exception_object->private_[4] = (uintptr_t) stop_parameter; 412 413 // do it 414 return unwind_phase2_forced(&uc, exception_object, stop, stop_parameter); 415 } 416 417 /// Called by personality handler during phase 2 to get LSDA for current frame. 418 _LIBUNWIND_EXPORT uintptr_t 419 _Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) { 420 uintptr_t result = 421 (uintptr_t)__unw_seh_get_disp_ctx((unw_cursor_t *)context)->HandlerData; 422 _LIBUNWIND_TRACE_API( 423 "_Unwind_GetLanguageSpecificData(context=%p) => 0x%" PRIxPTR, 424 (void *)context, result); 425 return result; 426 } 427 428 /// Called by personality handler during phase 2 to find the start of the 429 /// function. 430 _LIBUNWIND_EXPORT uintptr_t 431 _Unwind_GetRegionStart(struct _Unwind_Context *context) { 432 DISPATCHER_CONTEXT *disp = __unw_seh_get_disp_ctx((unw_cursor_t *)context); 433 uintptr_t result = (uintptr_t)disp->FunctionEntry->BeginAddress + disp->ImageBase; 434 _LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p) => 0x%" PRIxPTR, 435 (void *)context, result); 436 return result; 437 } 438 439 static int __unw_init_seh(unw_cursor_t *cursor, CONTEXT *context) { 440 #ifdef _LIBUNWIND_TARGET_X86_64 441 new (reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor)) 442 UnwindCursor<LocalAddressSpace, Registers_x86_64>( 443 context, LocalAddressSpace::sThisAddressSpace); 444 auto *co = reinterpret_cast<AbstractUnwindCursor *>(cursor); 445 co->setInfoBasedOnIPRegister(); 446 return UNW_ESUCCESS; 447 #elif defined(_LIBUNWIND_TARGET_ARM) 448 new (reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm> *>(cursor)) 449 UnwindCursor<LocalAddressSpace, Registers_arm>( 450 context, LocalAddressSpace::sThisAddressSpace); 451 auto *co = reinterpret_cast<AbstractUnwindCursor *>(cursor); 452 co->setInfoBasedOnIPRegister(); 453 return UNW_ESUCCESS; 454 #elif defined(_LIBUNWIND_TARGET_AARCH64) 455 new (reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm64> *>(cursor)) 456 UnwindCursor<LocalAddressSpace, Registers_arm64>( 457 context, LocalAddressSpace::sThisAddressSpace); 458 auto *co = reinterpret_cast<AbstractUnwindCursor *>(cursor); 459 co->setInfoBasedOnIPRegister(); 460 return UNW_ESUCCESS; 461 #else 462 return UNW_EINVAL; 463 #endif 464 } 465 466 static DISPATCHER_CONTEXT *__unw_seh_get_disp_ctx(unw_cursor_t *cursor) { 467 #ifdef _LIBUNWIND_TARGET_X86_64 468 return reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor)->getDispatcherContext(); 469 #elif defined(_LIBUNWIND_TARGET_ARM) 470 return reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm> *>(cursor)->getDispatcherContext(); 471 #elif defined(_LIBUNWIND_TARGET_AARCH64) 472 return reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm64> *>(cursor)->getDispatcherContext(); 473 #else 474 return nullptr; 475 #endif 476 } 477 478 static void __unw_seh_set_disp_ctx(unw_cursor_t *cursor, 479 DISPATCHER_CONTEXT *disp) { 480 #ifdef _LIBUNWIND_TARGET_X86_64 481 reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor)->setDispatcherContext(disp); 482 #elif defined(_LIBUNWIND_TARGET_ARM) 483 reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm> *>(cursor)->setDispatcherContext(disp); 484 #elif defined(_LIBUNWIND_TARGET_AARCH64) 485 reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm64> *>(cursor)->setDispatcherContext(disp); 486 #endif 487 } 488 489 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 490