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tweak exception handler

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This commit is contained in:
FunkyFr3sh 2024-09-24 23:36:11 +02:00
parent e0e59cd9fa
commit 80b8a996a7
3 changed files with 61 additions and 97 deletions
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2
inc/debug.h
View File

@ -6,6 +6,7 @@
#include <intrin.h>
LONG WINAPI dbg_exception_handler(EXCEPTION_POINTERS* exception);
LONG WINAPI dbg_vectored_exception_handler(EXCEPTION_POINTERS* exception);
void dbg_counter_start();
double dbg_counter_stop();
void dbg_debug_string(const char* format, ...);
@ -33,6 +34,7 @@ void __cdecl dbg_invoke_watson(wchar_t const*, wchar_t const*, wchar_t const*, u
extern double g_dbg_frame_time;
extern DWORD g_dbg_frame_count;
extern LPTOP_LEVEL_EXCEPTION_FILTER g_dbg_exception_filter;
extern PVOID g_dbg_exception_handle;
#if defined(__GNUC__) /* wrap msvc intrinsics onto gcc builtins */
#undef _ReturnAddress

57
src/debug.c
View File

@ -15,12 +15,12 @@
#include "utils.h"
#include "dllmain.h"
#include "config.h"
#include "patch.h"
double g_dbg_frame_time = 0;
DWORD g_dbg_frame_count = 0;
LPTOP_LEVEL_EXCEPTION_FILTER g_dbg_exception_filter;
PVOID g_dbg_exception_handle;
static LONGLONG g_dbg_counter_start_time = 0;
static double g_dbg_counter_freq = 0.0;
@ -37,16 +37,6 @@ static int g_dbg_crash_count = 0;
LONG WINAPI dbg_exception_handler(EXCEPTION_POINTERS* exception)
{
if (!exception || !exception->ExceptionRecord)
{
if (g_dbg_exception_filter)
return g_dbg_exception_filter(exception);
return EXCEPTION_EXECUTE_HANDLER;
}
if (exception->ExceptionRecord->ExceptionCode != STATUS_PRIVILEGED_INSTRUCTION || !g_config.ignore_exceptions)
{
g_dbg_crash_count++;
HANDLE dmp =
@ -77,8 +67,9 @@ LONG WINAPI dbg_exception_handler(EXCEPTION_POINTERS* exception)
CloseHandle(dmp);
}
}
if (exception && exception->ExceptionRecord)
{
HMODULE mod = NULL;
char filename[MAX_PATH] = { 0 };
@ -99,36 +90,6 @@ LONG WINAPI dbg_exception_handler(EXCEPTION_POINTERS* exception)
(int)exception->ExceptionRecord->ExceptionAddress - (int)mod,
exception->ExceptionRecord->ExceptionCode,
filename);
if (g_config.ignore_exceptions &&
exception->ContextRecord &&
exception->ExceptionRecord->ExceptionAddress &&
exception->ExceptionRecord->ExceptionCode == STATUS_PRIVILEGED_INSTRUCTION)
{
size_t size = 0;
BYTE* addr = exception->ExceptionRecord->ExceptionAddress;
switch (*addr)
{
case 0xE4: // IN ib
case 0xE5: // IN id
case 0xE6: // OUT ib
case 0xE7: // OUT ib
size = 2;
break;
case 0xEC: // IN ib
case 0xED: // IN id
case 0xEE: // OUT
case 0xEF: // OUT
size = 1;
break;
}
if (size)
{
exception->ContextRecord->Eip += size;
patch_clear((void*)addr, 0x90, (char*)addr + size);
return EXCEPTION_CONTINUE_EXECUTION;
}
}
if (g_dbg_exception_filter)
@ -152,8 +113,9 @@ void __cdecl dbg_invoke_watson(
TerminateProcess(GetCurrentProcess(), STATUS_INVALID_CRUNTIME_PARAMETER);
}
#else
LONG WINAPI dbg_exception_handler(EXCEPTION_POINTERS* exception)
#endif
LONG WINAPI dbg_vectored_exception_handler(EXCEPTION_POINTERS* exception)
{
if (exception &&
exception->ContextRecord &&
@ -182,17 +144,12 @@ LONG WINAPI dbg_exception_handler(EXCEPTION_POINTERS* exception)
if (size)
{
exception->ContextRecord->Eip += size;
patch_clear((void*)addr, 0x90, (char*)addr + size);
return EXCEPTION_CONTINUE_EXECUTION;
}
}
if (g_dbg_exception_filter)
return g_dbg_exception_filter(exception);
return EXCEPTION_EXECUTE_HANDLER;
return EXCEPTION_CONTINUE_SEARCH;
}
#endif
void dbg_init()
{

13
src/dllmain.c
View File

@ -43,14 +43,15 @@ BOOL WINAPI DllMain(HANDLE hDll, DWORD dwReason, LPVOID lpReserved)
#ifdef _DEBUG
dbg_init();
g_dbg_exception_filter = real_SetUnhandledExceptionFilter((LPTOP_LEVEL_EXCEPTION_FILTER)dbg_exception_handler);
#endif
cfg_load();
#else
cfg_load();
if (g_config.ignore_exceptions)
{
g_dbg_exception_filter = real_SetUnhandledExceptionFilter((LPTOP_LEVEL_EXCEPTION_FILTER)dbg_exception_handler);
g_dbg_exception_handle =
AddVectoredExceptionHandler(1, (PVECTORED_EXCEPTION_HANDLER)dbg_vectored_exception_handler);
}
#endif
char buf[1024];
@ -147,6 +148,10 @@ BOOL WINAPI DllMain(HANDLE hDll, DWORD dwReason, LPVOID lpReserved)
keyboard_hook_exit();
dinput_hook_exit();
hook_exit();
if (g_dbg_exception_handle)
RemoveVectoredExceptionHandler(g_dbg_exception_handle);
break;
}
}