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[dynarmic] fix exception posix handler

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Signed-off-by: lizzie <lizzie@eden-emu.dev>
This commit is contained in:
lizzie 2025-09-16 20:20:21 +00:00 • committed by crueter
parent 189b1a1850
commit b7944e2bcf
1 changed files with 14 additions and 67 deletions
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81
src/dynarmic/src/dynarmic/backend/exception_handler_posix.cpp
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@ -7,14 +7,16 @@
*/
#include <cstring>
#include <functional>
#include <memory>
#include <mutex>
#include <shared_mutex>
#include <optional>
#include <ankerl/unordered_dense.h>
#include "dynarmic/backend/exception_handler.h"
#include "dynarmic/common/assert.h"
#include "dynarmic/common/context.h"
#include <mcl/bit_cast.hpp>
#include "dynarmic/common/common_types.h"
#if defined(ARCHITECTURE_x86_64)
# include "dynarmic/backend/x64/block_of_code.h"
#elif defined(ARCHITECTURE_arm64)
@ -111,68 +113,14 @@ void RegisterHandler() {
}
}
SigHandler::SigHandler() {
const size_t signal_stack_size = std::max<size_t>(SIGSTKSZ, 2 * 1024 * 1024);
signal_stack_memory = std::malloc(signal_stack_size);
stack_t signal_stack;
signal_stack.ss_sp = signal_stack_memory;
signal_stack.ss_size = signal_stack_size;
signal_stack.ss_flags = 0;
if (sigaltstack(&signal_stack, nullptr) != 0) {
fmt::print(stderr, "dynarmic: POSIX SigHandler: init failure at sigaltstack\n");
supports_fast_mem = false;
return;
}
struct sigaction sa;
sa.sa_handler = nullptr;
sa.sa_sigaction = &SigHandler::SigAction;
sa.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART;
sigemptyset(&sa.sa_mask);
if (sigaction(SIGSEGV, &sa, &old_sa_segv) != 0) {
fmt::print(stderr, "dynarmic: POSIX SigHandler: could not set SIGSEGV handler\n");
supports_fast_mem = false;
return;
}
#ifdef __APPLE__
if (sigaction(SIGBUS, &sa, &old_sa_bus) != 0) {
fmt::print(stderr, "dynarmic: POSIX SigHandler: could not set SIGBUS handler\n");
supports_fast_mem = false;
return;
}
#endif
}
SigHandler::~SigHandler() {
std::free(signal_stack_memory);
}
void SigHandler::AddCodeBlock(CodeBlockInfo cbi) {
std::lock_guard<std::mutex> guard(code_block_infos_mutex);
if (auto const iter = FindCodeBlockInfo(cbi.code_begin); iter != code_block_infos.end())
code_block_infos.erase(iter);
code_block_infos.push_back(cbi);
}
void SigHandler::RemoveCodeBlock(u64 host_pc) {
std::lock_guard<std::mutex> guard(code_block_infos_mutex);
const auto iter = FindCodeBlockInfo(host_pc);
if (iter != code_block_infos.end())
code_block_infos.erase(iter);
}
void SigHandler::SigAction(int sig, siginfo_t* info, void* raw_context) {
ASSERT(sig == SIGSEGV || sig == SIGBUS);
DEBUG_ASSERT(sig == SIGSEGV || sig == SIGBUS);
CTX_DECLARE(raw_context);
#if defined(ARCHITECTURE_x86_64)
{
std::lock_guard<std::mutex> guard(sig_handler->code_block_infos_mutex);
const auto iter = sig_handler->FindCodeBlockInfo(CTX_RIP);
if (iter != sig_handler->code_block_infos.end()) {
FakeCall fc = iter->cb(CTX_RIP);
std::shared_lock guard(sig_handler->code_block_infos_mutex);
if (auto const iter = sig_handler->FindCodeBlockInfo(CTX_RIP); iter != sig_handler->code_block_infos.end()) {
FakeCall fc = iter->second.cb(CTX_RIP);
CTX_RSP -= sizeof(u64);
*mcl::bit_cast<u64*>(CTX_RSP) = fc.ret_rip;
CTX_RIP = fc.call_rip;
@ -182,10 +130,9 @@ void SigHandler::SigAction(int sig, siginfo_t* info, void* raw_context) {
fmt::print(stderr, "Unhandled {} at rip {:#018x}\n", sig == SIGSEGV ? "SIGSEGV" : "SIGBUS", CTX_RIP);
#elif defined(ARCHITECTURE_arm64)
{
std::lock_guard<std::mutex> guard(sig_handler->code_block_infos_mutex);
const auto iter = sig_handler->FindCodeBlockInfo(CTX_PC);
if (iter != sig_handler->code_block_infos.end()) {
FakeCall fc = iter->cb(CTX_PC);
std::shared_lock guard(sig_handler->code_block_infos_mutex);
if (const auto iter = sig_handler->FindCodeBlockInfo(CTX_PC); iter != sig_handler->code_block_infos.end()) {
FakeCall fc = iter->second.cb(CTX_PC);
CTX_PC = fc.call_pc;
return;
}
@ -240,15 +187,15 @@ private:
ExceptionHandler::ExceptionHandler() = default;
ExceptionHandler::~ExceptionHandler() = default;
#if defined(ARCHITECTURE_x86_64)
#if defined(MCL_ARCHITECTURE_X86_64)
void ExceptionHandler::Register(X64::BlockOfCode& code) {
impl = std::make_unique<Impl>(mcl::bit_cast<u64>(code.getCode()), code.GetTotalCodeSize());
}
#elif defined(ARCHITECTURE_arm64)
#elif defined(MCL_ARCHITECTURE_ARM64)
void ExceptionHandler::Register(oaknut::CodeBlock& mem, std::size_t size) {
impl = std::make_unique<Impl>(mcl::bit_cast<u64>(mem.ptr()), size);
}
#elif defined(ARCHITECTURE_riscv64)
#elif defined(MCL_ARCHITECTURE_RISCV)
void ExceptionHandler::Register(RV64::CodeBlock& mem, std::size_t size) {
impl = std::make_unique<Impl>(mcl::bit_cast<u64>(mem.ptr<u64>()), size);
}