From 475b2cc3be25e8c69c9f178b0d6835845a65b0a3 Mon Sep 17 00:00:00 2001
From: Owen Shepherd <owen.shepherd@e43.eu>
Date: Wed, 15 Aug 2012 23:53:54 +0100
Subject: [PATCH] win32: add a last chance exception handler which invokes the
 appropriate signal handler

---
 platform/win32/crt0.c | 58 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/platform/win32/crt0.c b/platform/win32/crt0.c
index fcdee08..f7f6a92 100644
--- a/platform/win32/crt0.c
+++ b/platform/win32/crt0.c
@@ -2,6 +2,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <signal.h>
 
 static char ** argvToAnsi( wchar_t ** wargv, int argc )
 {
@@ -40,6 +41,60 @@ static void freeArgs( void )
     LocalFree( wargv );
 }
 
+extern void (*_PDCLIB_sigfpe)( int );
+extern void (*_PDCLIB_sigill)( int );
+extern void (*_PDCLIB_sigsegv)( int );
+
+static LPTOP_LEVEL_EXCEPTION_FILTER oldFilter;
+static LONG CALLBACK sehExceptionFilter( EXCEPTION_POINTERS * exInfo )
+{
+    int sig;
+    void (*handler)( int );
+
+    switch( exInfo->ExceptionRecord->ExceptionCode ) {
+        case EXCEPTION_ACCESS_VIOLATION:
+        case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
+        case EXCEPTION_DATATYPE_MISALIGNMENT:
+        case EXCEPTION_GUARD_PAGE:
+        case EXCEPTION_IN_PAGE_ERROR:
+        case EXCEPTION_STACK_OVERFLOW:
+            sig = SIGSEGV;
+            handler = _PDCLIB_sigsegv;
+            break;
+
+        case EXCEPTION_ILLEGAL_INSTRUCTION:
+        case EXCEPTION_PRIV_INSTRUCTION:
+            sig = SIGILL;
+            handler = _PDCLIB_sigill;
+            break;
+
+        case EXCEPTION_INT_DIVIDE_BY_ZERO:
+        case EXCEPTION_INT_OVERFLOW:
+        case EXCEPTION_FLT_DENORMAL_OPERAND:
+        case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+        case EXCEPTION_FLT_INEXACT_RESULT:
+        case EXCEPTION_FLT_INVALID_OPERATION:
+        case EXCEPTION_FLT_OVERFLOW:
+        case EXCEPTION_FLT_STACK_CHECK:
+        case EXCEPTION_FLT_UNDERFLOW:
+            sig = SIGFPE;
+            handler = _PDCLIB_sigfpe;
+            break;
+
+        default:
+            return oldFilter ? oldFilter( exInfo ) : EXCEPTION_EXECUTE_HANDLER;
+    }
+
+    if(handler == SIG_DFL) {
+        return EXCEPTION_EXECUTE_HANDLER;
+    } else if(handler == SIG_IGN) {
+        return EXCEPTION_CONTINUE_EXECUTION;
+    } else {
+        handler( sig );
+        return EXCEPTION_CONTINUE_EXECUTION;
+    }
+}
+
 extern int main( int argc, char ** argv, char ** envp );
 _PDCLIB_noreturn void mainCRTStartup( void ) 
 {
@@ -47,11 +102,14 @@ _PDCLIB_noreturn void mainCRTStartup( void )
     stdout->handle = GetStdHandle(STD_OUTPUT_HANDLE);
     stderr->handle = GetStdHandle(STD_ERROR_HANDLE);
 
+    oldFilter = SetUnhandledExceptionFilter( sehExceptionFilter );
+
     cl    = GetCommandLineW();
     wargv = CommandLineToArgvW(cl, &argc);
     argv  = argvToAnsi(wargv, argc);
     atexit(freeArgs);
 
     int exitStatus = main(argc, argv, NULL);
+
     exit(exitStatus);
 }
-- 
2.40.0