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exception_handler_windows: Do not attempt to call cb when cb isn't callable

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This commit is contained in:
MerryMage 2020-04-13 09:55:18 +01:00
parent 4e83e81e58
commit cc012a830c
1 changed files with 15 additions and 3 deletions
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18
src/backend/x64/exception_handler_windows.cpp
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@ -169,7 +169,12 @@ struct ExceptionHandler::Impl final {
const auto prolog_info = GetPrologueInformation();
code.align(16);
const u8* exception_handler = code.getCurr<u8*>();
const u8* exception_handler_without_cb = code.getCurr<u8*>();
code.mov(code.eax, static_cast<u32>(ExceptionContinueSearch));
code.ret();
code.align(16);
const u8* exception_handler_with_cb = code.getCurr<u8*>();
// Our 3rd argument is a PCONTEXT.
code.sub(code.rsp, 8);
code.mov(code.ABI_PARAM1, Common::BitCast<u64>(&cb));
@ -187,6 +192,9 @@ struct ExceptionHandler::Impl final {
code.mov(code.eax, static_cast<u32>(ExceptionContinueExecution));
code.ret();
exception_handler_without_cb_offset = static_cast<ULONG>(exception_handler_without_cb - code.getCode<u8*>());
exception_handler_with_cb_offset = static_cast<ULONG>(exception_handler_with_cb - code.getCode<u8*>());
code.align(16);
UNWIND_INFO* unwind_info = static_cast<UNWIND_INFO*>(code.AllocateFromCodeSpace(sizeof(UNWIND_INFO)));
unwind_info->Version = 1;
@ -200,8 +208,8 @@ struct ExceptionHandler::Impl final {
UNWIND_CODE* unwind_code = static_cast<UNWIND_CODE*>(code.AllocateFromCodeSpace(size_of_unwind_code));
memcpy(unwind_code, prolog_info.unwind_code.data(), size_of_unwind_code);
// UNWIND_INFO::ExceptionInfo field:
UNW_EXCEPTION_INFO* except_info = static_cast<UNW_EXCEPTION_INFO*>(code.AllocateFromCodeSpace(sizeof(UNW_EXCEPTION_INFO)));
except_info->ExceptionHandler = static_cast<ULONG>(exception_handler - code.getCode<u8*>());
except_info = static_cast<UNW_EXCEPTION_INFO*>(code.AllocateFromCodeSpace(sizeof(UNW_EXCEPTION_INFO)));
except_info->ExceptionHandler = exception_handler_without_cb_offset;
code.align(16);
rfuncs = static_cast<RUNTIME_FUNCTION*>(code.AllocateFromCodeSpace(sizeof(RUNTIME_FUNCTION)));
@ -214,6 +222,7 @@ struct ExceptionHandler::Impl final {
void SetCallback(std::function<FakeCall(u64)> new_cb) {
cb = new_cb;
except_info->ExceptionHandler = cb ? exception_handler_with_cb_offset : exception_handler_without_cb_offset;
}
~Impl() {
@ -223,6 +232,9 @@ struct ExceptionHandler::Impl final {
private:
RUNTIME_FUNCTION* rfuncs;
std::function<FakeCall(u64)> cb;
UNW_EXCEPTION_INFO* except_info;
ULONG exception_handler_without_cb_offset;
ULONG exception_handler_with_cb_offset;
};
ExceptionHandler::ExceptionHandler() = default;