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Turn off exception callback filtering on WoW64. #12

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Turn off exception callback filtering on WoW64. #12

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25 changes: 25 additions & 0 deletions mono/mini/exceptions-x86.c
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,10 @@ static MonoW32ExceptionHandler segv_handler;

static LPTOP_LEVEL_EXCEPTION_FILTER old_handler;

#ifndef PROCESS_CALLBACK_FILTER_ENABLED
# define PROCESS_CALLBACK_FILTER_ENABLED 1
#endif

#define W32_SEH_HANDLE_EX(_ex) \
if (_ex##_handler) _ex##_handler(0, er, sctx)

Expand Down Expand Up @@ -833,6 +837,27 @@ mono_arch_get_throw_corlib_exception (void)
void
mono_arch_exceptions_init (void)
{
/*
* If we're running WoW64, we need to set the usermode exception policy
* for SEHs to behave. This requires hotfix http://support.microsoft.com/kb/976038
* or (eventually) Windows 7 SP1.
*/
#ifdef PLATFORM_WIN32
DWORD flags;
FARPROC getter;
FARPROC setter;
HMODULE kernel32 = LoadLibraryW (L"kernel32.dll");

if (kernel32) {
getter = GetProcAddress (kernel32, "GetProcessUserModeExceptionPolicy");
setter = GetProcAddress (kernel32, "SetProcessUserModeExceptionPolicy");
if (getter && setter) {
if (getter (&flags))
setter (flags & ~PROCESS_CALLBACK_FILTER_ENABLED);
}
}
#endif

if (mono_aot_only) {
signal_exception_trampoline = mono_aot_get_named_code ("x86_signal_exception_trampoline");
return;
Expand Down