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llvm-project/libunwind/src/Unwind-seh.cpp
Martin Storsjö a17afee7ec
[libunwind] Fix aarch64 SEH unwinding with a debugger attached (#162867) 
See https://github.com/LuaJIT/LuaJIT/issues/593#issuecomment-1717728494
for the original explanation of the problem.

In short; when a debugger is attached, there's a
function KiUserExceptionDispatcher in the stack that is being unwound.
The function KiUserExceptionDispatcher contains a CONTEXT, with a copy
of the context from where the exception was raised. When unwinding
through this function, this whole CONTEXT gets restored.

This CONTEXT is what we receive a pointer to in the callbacks, as the
ms_ctx pointer.

When we unwind manually using RtlUnwindEx, the unwinding overwrites the
CONTEXT that is passed to it. Thus, to avoid clobbering the CONTEXT that
needs to be restored by KiUserExceptionDispatcher, we could either
declare a new temporary CONTEXT on the stack before calling RtlUnwindEx,
or just use disp->ContextRecord as we already have available.

Fixes: https://github.com/llvm/llvm-project/issues/161851

Co-authored-by: Peter Cawley <corsix@corsix.org>
Co-authored-by: Hannes Domani <ssbssa@yahoo.de>
2025-10-16 22:47:08 +03:00

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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
//
//===----------------------------------------------------------------------===//
//
// Implements SEH-based Itanium C++ exceptions.
//
//===----------------------------------------------------------------------===//
#include "config.h"
#if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
#include <unwind.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <windef.h>
#include <excpt.h>
#include <winnt.h>
#include <ntstatus.h>
#include "libunwind_ext.h"
#include "UnwindCursor.hpp"
using namespace libunwind;
#define STATUS_USER_DEFINED (1u << 29)
#define STATUS_GCC_MAGIC (('G' << 16) | ('C' << 8) | 'C')
#define MAKE_CUSTOM_STATUS(s, c) \
((NTSTATUS)(((s) << 30) | STATUS_USER_DEFINED | (c)))
#define MAKE_GCC_EXCEPTION(c) \
MAKE_CUSTOM_STATUS(STATUS_SEVERITY_SUCCESS, STATUS_GCC_MAGIC | ((c) << 24))
/// SEH exception raised by libunwind when the program calls
/// \c _Unwind_RaiseException.
#define STATUS_GCC_THROW MAKE_GCC_EXCEPTION(0) // 0x20474343
/// SEH exception raised by libunwind to initiate phase 2 of exception
/// handling.
#define STATUS_GCC_UNWIND MAKE_GCC_EXCEPTION(1) // 0x21474343
static int __unw_init_seh(unw_cursor_t *cursor, CONTEXT *ctx);
static DISPATCHER_CONTEXT *__unw_seh_get_disp_ctx(unw_cursor_t *cursor);
static void __unw_seh_set_disp_ctx(unw_cursor_t *cursor,
DISPATCHER_CONTEXT *disp);
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wgnu-anonymous-struct"
// Local redefinition of this type; mingw-w64 headers lack the
// DISPATCHER_CONTEXT_NONVOLREG_ARM64 type as of May 2025, so locally redefine
// it and use that definition, to avoid needing to test/guess whether the real
// type is available of not.
union LOCAL_DISPATCHER_CONTEXT_NONVOLREG_ARM64 {
BYTE Buffer[11 * sizeof(DWORD64) + 8 * sizeof(double)];
struct {
DWORD64 GpNvRegs[11];
double FpNvRegs[8];
};
};
// Custom data type definition; this type is not defined in WinSDK.
union LOCAL_DISPATCHER_CONTEXT_NONVOLREG_ARM {
BYTE Buffer[8 * sizeof(DWORD) + 8 * sizeof(double)];
struct {
DWORD GpNvRegs[8];
double FpNvRegs[8];
};
};
#pragma clang diagnostic pop
/// Common implementation of SEH-style handler functions used by Itanium-
/// style frames. Depending on how and why it was called, it may do one of:
/// a) Delegate to the given Itanium-style personality function; or
/// b) Initiate a collided unwind to halt unwinding.
_LIBUNWIND_EXPORT EXCEPTION_DISPOSITION
_GCC_specific_handler(PEXCEPTION_RECORD ms_exc, PVOID frame, PCONTEXT ms_ctx,
DISPATCHER_CONTEXT *disp, _Unwind_Personality_Fn pers) {
unw_cursor_t cursor;
_Unwind_Exception *exc;
_Unwind_Action action;
struct _Unwind_Context *ctx = nullptr;
_Unwind_Reason_Code urc;
uintptr_t retval, target;
bool ours = false;
_LIBUNWIND_TRACE_UNWINDING("_GCC_specific_handler(%#010lx(%lx), %p)",
ms_exc->ExceptionCode, ms_exc->ExceptionFlags,
(void *)frame);
if (ms_exc->ExceptionCode == STATUS_GCC_UNWIND) {
if (IS_TARGET_UNWIND(ms_exc->ExceptionFlags)) {
// Set up the upper return value (the lower one and the target PC
// were set in the call to RtlUnwindEx()) for the landing pad.
#ifdef __x86_64__
disp->ContextRecord->Rdx = ms_exc->ExceptionInformation[3];
#elif defined(__arm__)
disp->ContextRecord->R1 = ms_exc->ExceptionInformation[3];
#elif defined(__aarch64__)
disp->ContextRecord->X1 = ms_exc->ExceptionInformation[3];
#endif
}
// This is the collided unwind to the landing pad. Nothing to do.
return ExceptionContinueSearch;
}
if (ms_exc->ExceptionCode == STATUS_GCC_THROW) {
// This is (probably) a libunwind-controlled exception/unwind. Recover the
// parameters which we set below, and pass them to the personality function.
ours = true;
exc = (_Unwind_Exception *)ms_exc->ExceptionInformation[0];
if (!IS_UNWINDING(ms_exc->ExceptionFlags) && ms_exc->NumberParameters > 1) {
ctx = (struct _Unwind_Context *)ms_exc->ExceptionInformation[1];
action = (_Unwind_Action)ms_exc->ExceptionInformation[2];
}
} else {
// Foreign exception.
// We can't interact with them (we don't know the original target frame
// that we should pass on to RtlUnwindEx in _Unwind_Resume), so just
// pass without calling our destructors here.
return ExceptionContinueSearch;
}
if (!ctx) {
__unw_init_seh(&cursor, disp->ContextRecord);
__unw_seh_set_disp_ctx(&cursor, disp);
__unw_set_reg(&cursor, UNW_REG_IP, disp->ControlPc);
ctx = (struct _Unwind_Context *)&cursor;
if (!IS_UNWINDING(ms_exc->ExceptionFlags)) {
if (ours && ms_exc->NumberParameters > 1)
action = (_Unwind_Action)(_UA_CLEANUP_PHASE | _UA_FORCE_UNWIND);
else
action = _UA_SEARCH_PHASE;
} else {
if (ours && ms_exc->ExceptionInformation[1] == (ULONG_PTR)frame)
action = (_Unwind_Action)(_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME);
else
action = _UA_CLEANUP_PHASE;
}
}
_LIBUNWIND_TRACE_UNWINDING("_GCC_specific_handler() calling personality "
"function %p(1, %d, %llx, %p, %p)",
(void *)pers, action, exc->exception_class,
(void *)exc, (void *)ctx);
urc = pers(1, action, exc->exception_class, exc, ctx);
_LIBUNWIND_TRACE_UNWINDING("_GCC_specific_handler() personality returned %d", urc);
switch (urc) {
case _URC_CONTINUE_UNWIND:
// If we're in phase 2, and the personality routine said to continue
// at the target frame, we're in real trouble.
if (action & _UA_HANDLER_FRAME)
_LIBUNWIND_ABORT("Personality continued unwind at the target frame!");
return ExceptionContinueSearch;
case _URC_HANDLER_FOUND:
// If we were called by __libunwind_seh_personality(), indicate that
// a handler was found; otherwise, initiate phase 2 by unwinding.
if (ours && ms_exc->NumberParameters > 1)
return 4 /* ExceptionExecuteHandler in mingw */;
// This should never happen in phase 2.
if (IS_UNWINDING(ms_exc->ExceptionFlags))
_LIBUNWIND_ABORT("Personality indicated exception handler in phase 2!");
exc->private_[1] = (ULONG_PTR)frame;
if (ours) {
ms_exc->NumberParameters = 4;
ms_exc->ExceptionInformation[1] = (ULONG_PTR)frame;
}
// FIXME: Indicate target frame in foreign case!
// phase 2: the clean up phase
RtlUnwindEx(frame, (PVOID)disp->ControlPc, ms_exc, exc, disp->ContextRecord,
disp->HistoryTable);
_LIBUNWIND_ABORT("RtlUnwindEx() failed");
case _URC_INSTALL_CONTEXT: {
// If we were called by __libunwind_seh_personality(), indicate that
// a handler was found; otherwise, it's time to initiate a collided
// unwind to the target.
if (ours && !IS_UNWINDING(ms_exc->ExceptionFlags) && ms_exc->NumberParameters > 1)
return 4 /* ExceptionExecuteHandler in mingw */;
// This should never happen in phase 1.
if (!IS_UNWINDING(ms_exc->ExceptionFlags))
_LIBUNWIND_ABORT("Personality installed context during phase 1!");
#ifdef __x86_64__
exc->private_[2] = disp->TargetIp;
__unw_get_reg(&cursor, UNW_X86_64_RAX, &retval);
__unw_get_reg(&cursor, UNW_X86_64_RDX, &exc->private_[3]);
#elif defined(__arm__)
exc->private_[2] = disp->TargetPc;
__unw_get_reg(&cursor, UNW_ARM_R0, &retval);
__unw_get_reg(&cursor, UNW_ARM_R1, &exc->private_[3]);
#elif defined(__aarch64__)
exc->private_[2] = disp->TargetPc;
__unw_get_reg(&cursor, UNW_AARCH64_X0, &retval);
__unw_get_reg(&cursor, UNW_AARCH64_X1, &exc->private_[3]);
#endif
__unw_get_reg(&cursor, UNW_REG_IP, &target);
ms_exc->ExceptionCode = STATUS_GCC_UNWIND;
#ifdef __x86_64__
ms_exc->ExceptionInformation[2] = disp->TargetIp;
#elif defined(__arm__) || defined(__aarch64__)
ms_exc->ExceptionInformation[2] = disp->TargetPc;
#endif
ms_exc->ExceptionInformation[3] = exc->private_[3];
// Give NTRTL some scratch space to keep track of the collided unwind.
// Don't use the one that was passed in; we don't want to overwrite the
// context in the DISPATCHER_CONTEXT.
CONTEXT new_ctx;
RtlUnwindEx(frame, (PVOID)target, ms_exc, (PVOID)retval, &new_ctx, disp->HistoryTable);
_LIBUNWIND_ABORT("RtlUnwindEx() failed");
}
// Anything else indicates a serious problem.
default: return ExceptionContinueExecution;
}
}
/// Personality function returned by \c __unw_get_proc_info() in SEH contexts.
/// This is a wrapper that calls the real SEH handler function, which in
/// turn (at least, for Itanium-style frames) calls the real Itanium
/// personality function (see \c _GCC_specific_handler()).
extern "C" _Unwind_Reason_Code
__libunwind_seh_personality(int version, _Unwind_Action state,
uint64_t klass, _Unwind_Exception *exc,
struct _Unwind_Context *context) {
(void)version;
(void)klass;
EXCEPTION_RECORD ms_exc;
bool phase2 = (state & (_UA_SEARCH_PHASE|_UA_CLEANUP_PHASE)) == _UA_CLEANUP_PHASE;
ms_exc.ExceptionCode = STATUS_GCC_THROW;
ms_exc.ExceptionFlags = 0;
ms_exc.NumberParameters = 3;
ms_exc.ExceptionInformation[0] = (ULONG_PTR)exc;
ms_exc.ExceptionInformation[1] = (ULONG_PTR)context;
ms_exc.ExceptionInformation[2] = state;
DISPATCHER_CONTEXT *disp_ctx =
__unw_seh_get_disp_ctx((unw_cursor_t *)context);
#if defined(__aarch64__)
LOCAL_DISPATCHER_CONTEXT_NONVOLREG_ARM64 nonvol;
memcpy(&nonvol.GpNvRegs, &disp_ctx->ContextRecord->X19,
sizeof(nonvol.GpNvRegs));
for (int i = 0; i < 8; i++)
nonvol.FpNvRegs[i] = disp_ctx->ContextRecord->V[i + 8].D[0];
disp_ctx->NonVolatileRegisters = nonvol.Buffer;
#elif defined(__arm__)
LOCAL_DISPATCHER_CONTEXT_NONVOLREG_ARM nonvol;
memcpy(&nonvol.GpNvRegs, &disp_ctx->ContextRecord->R4,
sizeof(nonvol.GpNvRegs));
memcpy(&nonvol.FpNvRegs, &disp_ctx->ContextRecord->D[8],
sizeof(nonvol.FpNvRegs));
disp_ctx->NonVolatileRegisters = nonvol.Buffer;
#endif
_LIBUNWIND_TRACE_UNWINDING("__libunwind_seh_personality() calling "
"LanguageHandler %p(%p, %p, %p, %p)",
(void *)disp_ctx->LanguageHandler, (void *)&ms_exc,
(void *)disp_ctx->EstablisherFrame,
(void *)disp_ctx->ContextRecord, (void *)disp_ctx);
EXCEPTION_DISPOSITION ms_act = disp_ctx->LanguageHandler(&ms_exc,
(PVOID)disp_ctx->EstablisherFrame,
disp_ctx->ContextRecord,
disp_ctx);
_LIBUNWIND_TRACE_UNWINDING("__libunwind_seh_personality() LanguageHandler "
"returned %d",
(int)ms_act);
switch (ms_act) {
case ExceptionContinueExecution: return _URC_END_OF_STACK;
case ExceptionContinueSearch: return _URC_CONTINUE_UNWIND;
case 4 /*ExceptionExecuteHandler*/:
return phase2 ? _URC_INSTALL_CONTEXT : _URC_HANDLER_FOUND;
default:
return phase2 ? _URC_FATAL_PHASE2_ERROR : _URC_FATAL_PHASE1_ERROR;
}
}
static _Unwind_Reason_Code
unwind_phase2_forced(unw_context_t *uc,
_Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter) {
unw_cursor_t cursor2;
__unw_init_local(&cursor2, uc);
// Walk each frame until we reach where search phase said to stop
while (__unw_step(&cursor2) > 0) {
// Update info about this frame.
unw_proc_info_t frameInfo;
if (__unw_get_proc_info(&cursor2, &frameInfo) != UNW_ESUCCESS) {
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): __unw_get_proc_info "
"failed => _URC_END_OF_STACK",
(void *)exception_object);
return _URC_FATAL_PHASE2_ERROR;
}
#ifndef NDEBUG
// When tracing, print state information.
if (_LIBUNWIND_TRACING_UNWINDING) {
char functionBuf[512];
const char *functionName = functionBuf;
unw_word_t offset;
if ((__unw_get_proc_name(&cursor2, functionBuf, sizeof(functionBuf),
&offset) != UNW_ESUCCESS) ||
(frameInfo.start_ip + offset > frameInfo.end_ip))
functionName = ".anonymous.";
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2_forced(ex_ojb=%p): start_ip=0x%" PRIxPTR
", func=%s, lsda=0x%" PRIxPTR ", personality=0x%" PRIxPTR,
(void *)exception_object, frameInfo.start_ip, functionName,
frameInfo.lsda, frameInfo.handler);
}
#endif
// Call stop function at each frame.
_Unwind_Action action =
(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE);
_Unwind_Reason_Code stopResult =
(*stop)(1, action, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)(&cursor2), stop_parameter);
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2_forced(ex_ojb=%p): stop function returned %d",
(void *)exception_object, stopResult);
if (stopResult != _URC_NO_REASON) {
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2_forced(ex_ojb=%p): stopped by stop function",
(void *)exception_object);
return _URC_FATAL_PHASE2_ERROR;
}
// If there is a personality routine, tell it we are unwinding.
if (frameInfo.handler != 0) {
_Unwind_Personality_Fn p =
(_Unwind_Personality_Fn)(intptr_t)(frameInfo.handler);
_LIBUNWIND_TRACE_UNWINDING(
"unwind_phase2_forced(ex_ojb=%p): calling personality function %p",
(void *)exception_object, (void *)(uintptr_t)p);
_Unwind_Reason_Code personalityResult =
(*p)(1, action, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)(&cursor2));
switch (personalityResult) {
case _URC_CONTINUE_UNWIND:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned "
"_URC_CONTINUE_UNWIND",
(void *)exception_object);
// Destructors called, continue unwinding
break;
case _URC_INSTALL_CONTEXT:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned "
"_URC_INSTALL_CONTEXT",
(void *)exception_object);
// We may get control back if landing pad calls _Unwind_Resume().
__unw_resume(&cursor2);
break;
case _URC_END_OF_STACK:
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned "
"_URC_END_OF_STACK",
(void *)exception_object);
break;
default:
// Personality routine returned an unknown result code.
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
"personality returned %d, "
"_URC_FATAL_PHASE2_ERROR",
(void *)exception_object, personalityResult);
return _URC_FATAL_PHASE2_ERROR;
}
if (personalityResult == _URC_END_OF_STACK)
break;
}
}
// Call stop function one last time and tell it we've reached the end
// of the stack.
_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): calling stop "
"function with _UA_END_OF_STACK",
(void *)exception_object);
_Unwind_Action lastAction =
(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE | _UA_END_OF_STACK);
(*stop)(1, lastAction, exception_object->exception_class, exception_object,
(struct _Unwind_Context *)(&cursor2), stop_parameter);
// Clean up phase did not resume at the frame that the search phase said it
// would.
return _URC_FATAL_PHASE2_ERROR;
}
/// Called by \c __cxa_throw(). Only returns if there is a fatal error.
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_RaiseException(_Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_RaiseException(ex_obj=%p)",
(void *)exception_object);
// Mark that this is a non-forced unwind, so _Unwind_Resume()
// can do the right thing.
memset(exception_object->private_, 0, sizeof(exception_object->private_));
// phase 1: the search phase
// We'll let the system do that for us.
RaiseException(STATUS_GCC_THROW, 0, 1, (ULONG_PTR *)&exception_object);
// If we get here, either something went horribly wrong or we reached the
// top of the stack. Either way, let libc++abi call std::terminate().
return _URC_END_OF_STACK;
}
/// When \c _Unwind_RaiseException() is in phase2, it hands control
/// to the personality function at each frame. The personality
/// may force a jump to a landing pad in that function; the landing
/// pad code may then call \c _Unwind_Resume() to continue with the
/// unwinding. Note: the call to \c _Unwind_Resume() is from compiler
/// generated user code. All other \c _Unwind_* routines are called
/// by the C++ runtime \c __cxa_* routines.
///
/// Note: re-throwing an exception (as opposed to continuing the unwind)
/// is implemented by having the code call \c __cxa_rethrow() which
/// in turn calls \c _Unwind_Resume_or_Rethrow().
_LIBUNWIND_EXPORT void
_Unwind_Resume(_Unwind_Exception *exception_object) {
_LIBUNWIND_TRACE_API("_Unwind_Resume(ex_obj=%p)", (void *)exception_object);
if (exception_object->private_[0] != 0) {
unw_context_t uc;
__unw_getcontext(&uc);
unwind_phase2_forced(&uc, exception_object,
(_Unwind_Stop_Fn) exception_object->private_[0],
(void *)exception_object->private_[4]);
} else {
// Recover the parameters for the unwind from the exception object
// so we can start unwinding again.
EXCEPTION_RECORD ms_exc;
CONTEXT ms_ctx;
UNWIND_HISTORY_TABLE hist;
memset(&ms_exc, 0, sizeof(ms_exc));
memset(&hist, 0, sizeof(hist));
ms_exc.ExceptionCode = STATUS_GCC_THROW;
ms_exc.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
ms_exc.NumberParameters = 4;
ms_exc.ExceptionInformation[0] = (ULONG_PTR)exception_object;
ms_exc.ExceptionInformation[1] = exception_object->private_[1];
ms_exc.ExceptionInformation[2] = exception_object->private_[2];
ms_exc.ExceptionInformation[3] = exception_object->private_[3];
RtlUnwindEx((PVOID)exception_object->private_[1],
(PVOID)exception_object->private_[2], &ms_exc,
exception_object, &ms_ctx, &hist);
}
// Clients assume _Unwind_Resume() does not return, so all we can do is abort.
_LIBUNWIND_ABORT("_Unwind_Resume() can't return");
}
/// Not used by C++.
/// Unwinds stack, calling "stop" function at each frame.
/// Could be used to implement \c longjmp().
_LIBUNWIND_EXPORT _Unwind_Reason_Code
_Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter) {
_LIBUNWIND_TRACE_API("_Unwind_ForcedUnwind(ex_obj=%p, stop=%p)",
(void *)exception_object, (void *)(uintptr_t)stop);
unw_context_t uc;
__unw_getcontext(&uc);
// Mark that this is a forced unwind, so _Unwind_Resume() can do
// the right thing.
exception_object->private_[0] = (uintptr_t) stop;
exception_object->private_[4] = (uintptr_t) stop_parameter;
// do it
return unwind_phase2_forced(&uc, exception_object, stop, stop_parameter);
}
/// Called by personality handler during phase 2 to get LSDA for current frame.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
uintptr_t result =
(uintptr_t)__unw_seh_get_disp_ctx((unw_cursor_t *)context)->HandlerData;
_LIBUNWIND_TRACE_API(
"_Unwind_GetLanguageSpecificData(context=%p) => 0x%" PRIxPTR,
(void *)context, result);
return result;
}
/// Called by personality handler during phase 2 to find the start of the
/// function.
_LIBUNWIND_EXPORT uintptr_t
_Unwind_GetRegionStart(struct _Unwind_Context *context) {
DISPATCHER_CONTEXT *disp = __unw_seh_get_disp_ctx((unw_cursor_t *)context);
uintptr_t result = (uintptr_t)disp->FunctionEntry->BeginAddress + disp->ImageBase;
_LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p) => 0x%" PRIxPTR,
(void *)context, result);
return result;
}
static int __unw_init_seh(unw_cursor_t *cursor, CONTEXT *context) {
#ifdef _LIBUNWIND_TARGET_X86_64
new (reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor))
UnwindCursor<LocalAddressSpace, Registers_x86_64>(
context, LocalAddressSpace::sThisAddressSpace);
auto *co = reinterpret_cast<AbstractUnwindCursor *>(cursor);
co->setInfoBasedOnIPRegister();
return UNW_ESUCCESS;
#elif defined(_LIBUNWIND_TARGET_ARM)
new (reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm> *>(cursor))
UnwindCursor<LocalAddressSpace, Registers_arm>(
context, LocalAddressSpace::sThisAddressSpace);
auto *co = reinterpret_cast<AbstractUnwindCursor *>(cursor);
co->setInfoBasedOnIPRegister();
return UNW_ESUCCESS;
#elif defined(_LIBUNWIND_TARGET_AARCH64)
new (reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm64> *>(cursor))
UnwindCursor<LocalAddressSpace, Registers_arm64>(
context, LocalAddressSpace::sThisAddressSpace);
auto *co = reinterpret_cast<AbstractUnwindCursor *>(cursor);
co->setInfoBasedOnIPRegister();
return UNW_ESUCCESS;
#else
return UNW_EINVAL;
#endif
}
static DISPATCHER_CONTEXT *__unw_seh_get_disp_ctx(unw_cursor_t *cursor) {
#ifdef _LIBUNWIND_TARGET_X86_64
return reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor)->getDispatcherContext();
#elif defined(_LIBUNWIND_TARGET_ARM)
return reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm> *>(cursor)->getDispatcherContext();
#elif defined(_LIBUNWIND_TARGET_AARCH64)
return reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm64> *>(cursor)->getDispatcherContext();
#else
return nullptr;
#endif
}
static void __unw_seh_set_disp_ctx(unw_cursor_t *cursor,
DISPATCHER_CONTEXT *disp) {
#ifdef _LIBUNWIND_TARGET_X86_64
reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor)->setDispatcherContext(disp);
#elif defined(_LIBUNWIND_TARGET_ARM)
reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm> *>(cursor)->setDispatcherContext(disp);
#elif defined(_LIBUNWIND_TARGET_AARCH64)
reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_arm64> *>(cursor)->setDispatcherContext(disp);
#endif
}
#endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
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