wine/dlls/winecrt0/exception.c

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/*
* Support functions for Wine exception handling
*
* Copyright (c) 1999, 2010 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include <stdarg.h>
#include "winternl.h"
#include "wine/exception.h"
#if defined(__x86_64__) && defined(__ASM_GLOBAL_FUNC)
extern void __wine_unwind_trampoline(void);
/* we need an extra call to make sure the stack is correctly aligned */
__ASM_GLOBAL_FUNC( __wine_unwind_trampoline, "callq *%rax" );
#endif
/* wrapper for RtlUnwind since it clobbers registers on Windows */
void __wine_rtl_unwind( EXCEPTION_REGISTRATION_RECORD* frame, EXCEPTION_RECORD *record,
void (*target)(void) )
{
#if defined(__GNUC__) && defined(__i386__)
int dummy1, dummy2, dummy3, dummy4;
__asm__ __volatile__("pushl %%ebp\n\t"
"pushl %%ebx\n\t"
"pushl $0\n\t"
"pushl %3\n\t"
"pushl %2\n\t"
"pushl %1\n\t"
"call *%0\n\t"
"popl %%ebx\n\t"
"popl %%ebp"
: "=a" (dummy1), "=S" (dummy2), "=D" (dummy3), "=c" (dummy4)
: "0" (RtlUnwind), "1" (frame), "2" (target), "3" (record)
: "edx", "memory" );
#elif defined(__x86_64__) && defined(__ASM_GLOBAL_FUNC)
RtlUnwind( frame, __wine_unwind_trampoline, record, target );
#else
RtlUnwind( frame, target, record, 0 );
#endif
for (;;) target();
}
static void DECLSPEC_NORETURN unwind_target(void)
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)__wine_get_frame();
__wine_pop_frame( &wine_frame->frame );
siglongjmp( wine_frame->jmp, 1 );
}
static void DECLSPEC_NORETURN unwind_frame( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame )
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
/* hack to make GetExceptionCode() work in handler */
wine_frame->ExceptionCode = record->ExceptionCode;
wine_frame->ExceptionRecord = wine_frame;
__wine_rtl_unwind( frame, record, unwind_target );
}
DWORD __wine_exception_handler( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
EXCEPTION_POINTERS ptrs;
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
return ExceptionContinueSearch;
ptrs.ExceptionRecord = record;
ptrs.ContextRecord = context;
switch(wine_frame->u.filter( &ptrs ))
{
case EXCEPTION_CONTINUE_SEARCH:
return ExceptionContinueSearch;
case EXCEPTION_CONTINUE_EXECUTION:
return ExceptionContinueExecution;
case EXCEPTION_EXECUTE_HANDLER:
break;
}
unwind_frame( record, frame );
}
DWORD __wine_exception_handler_page_fault( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
return ExceptionContinueSearch;
if (record->ExceptionCode != STATUS_ACCESS_VIOLATION)
return ExceptionContinueSearch;
unwind_frame( record, frame );
}
DWORD __wine_exception_handler_all( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
return ExceptionContinueSearch;
unwind_frame( record, frame );
}
DWORD __wine_finally_handler( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
wine_frame->u.finally_func( FALSE );
}
return ExceptionContinueSearch;
}