mirror of
https://github.com/reactos/reactos.git
synced 2024-11-11 01:04:11 +00:00
220 lines
7.9 KiB
C
220 lines
7.9 KiB
C
/*
|
|
* msvcrt.dll exception handling
|
|
*
|
|
* Copyright 2000 Jon Griffiths
|
|
* Copyright 2005 Juan Lang
|
|
*
|
|
* 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
|
|
*
|
|
* FIXME: Incomplete support for nested exceptions/try block cleanup.
|
|
*/
|
|
|
|
#include <precomp.h>
|
|
#include "excpt.h"
|
|
#include <wine/exception.h>
|
|
|
|
void CDECL _global_unwind2(EXCEPTION_REGISTRATION_RECORD* frame);
|
|
|
|
/* VC++ extensions to Win32 SEH */
|
|
typedef struct _SCOPETABLE
|
|
{
|
|
int previousTryLevel;
|
|
int (*lpfnFilter)(PEXCEPTION_POINTERS);
|
|
int (*lpfnHandler)(void);
|
|
} SCOPETABLE, *PSCOPETABLE;
|
|
|
|
typedef struct _MSVCRT_EXCEPTION_FRAME
|
|
{
|
|
EXCEPTION_REGISTRATION_RECORD *prev;
|
|
void (*handler)(PEXCEPTION_RECORD, EXCEPTION_REGISTRATION_RECORD*,
|
|
PCONTEXT, PEXCEPTION_RECORD);
|
|
PSCOPETABLE scopetable;
|
|
int trylevel;
|
|
int _ebp;
|
|
PEXCEPTION_POINTERS xpointers;
|
|
} MSVCRT_EXCEPTION_FRAME;
|
|
|
|
typedef struct
|
|
{
|
|
int gs_cookie_offset;
|
|
ULONG gs_cookie_xor;
|
|
int eh_cookie_offset;
|
|
ULONG eh_cookie_xor;
|
|
SCOPETABLE entries[1];
|
|
} SCOPETABLE_V4;
|
|
|
|
#ifdef __i386__
|
|
|
|
static const SCOPETABLE_V4 *get_scopetable_v4( MSVCRT_EXCEPTION_FRAME *frame, ULONG_PTR cookie )
|
|
{
|
|
return (const SCOPETABLE_V4 *)((ULONG_PTR)frame->scopetable ^ cookie);
|
|
}
|
|
|
|
#if defined(__GNUC__)
|
|
static inline void call_finally_block( void *code_block, void *base_ptr )
|
|
{
|
|
__asm__ __volatile__ ("movl %1,%%ebp; call *%%eax"
|
|
: : "a" (code_block), "g" (base_ptr));
|
|
}
|
|
|
|
static inline int call_filter( int (*func)(PEXCEPTION_POINTERS), void *arg, void *ebp )
|
|
{
|
|
int ret;
|
|
__asm__ __volatile__ ("pushl %%ebp; pushl %3; movl %2,%%ebp; call *%%eax; popl %%ebp; popl %%ebp"
|
|
: "=a" (ret)
|
|
: "0" (func), "r" (ebp), "r" (arg)
|
|
: "ecx", "edx", "memory" );
|
|
return ret;
|
|
}
|
|
static inline int call_unwind_func( int (*func)(void), void *ebp )
|
|
{
|
|
int ret;
|
|
__asm__ __volatile__ ("pushl %%ebp\n\t"
|
|
"pushl %%ebx\n\t"
|
|
"pushl %%esi\n\t"
|
|
"pushl %%edi\n\t"
|
|
"movl %2,%%ebp\n\t"
|
|
"call *%0\n\t"
|
|
"popl %%edi\n\t"
|
|
"popl %%esi\n\t"
|
|
"popl %%ebx\n\t"
|
|
"popl %%ebp"
|
|
: "=a" (ret)
|
|
: "0" (func), "r" (ebp)
|
|
: "ecx", "edx", "memory" );
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec,
|
|
EXCEPTION_REGISTRATION_RECORD* frame,
|
|
PCONTEXT context,
|
|
EXCEPTION_REGISTRATION_RECORD** dispatch)
|
|
{
|
|
if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
|
|
return ExceptionContinueSearch;
|
|
*dispatch = frame;
|
|
return ExceptionCollidedUnwind;
|
|
}
|
|
|
|
void msvcrt_local_unwind4( ULONG *cookie, MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp )
|
|
{
|
|
EXCEPTION_REGISTRATION_RECORD reg;
|
|
const SCOPETABLE_V4 *scopetable = get_scopetable_v4( frame, *cookie );
|
|
|
|
TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel);
|
|
|
|
/* Register a handler in case of a nested exception */
|
|
reg.Handler = (PEXCEPTION_ROUTINE)MSVCRT_nested_handler;
|
|
reg.Prev = NtCurrentTeb()->NtTib.ExceptionList;
|
|
__wine_push_frame(®);
|
|
|
|
while (frame->trylevel != -2 && frame->trylevel != trylevel)
|
|
{
|
|
int level = frame->trylevel;
|
|
frame->trylevel = scopetable->entries[level].previousTryLevel;
|
|
if (!scopetable->entries[level].lpfnFilter)
|
|
{
|
|
TRACE( "__try block cleanup level %d handler %p ebp %p\n",
|
|
level, scopetable->entries[level].lpfnHandler, ebp );
|
|
call_unwind_func( scopetable->entries[level].lpfnHandler, ebp );
|
|
}
|
|
}
|
|
__wine_pop_frame(®);
|
|
TRACE("unwound OK\n");
|
|
}
|
|
|
|
/*********************************************************************
|
|
* _except_handler4_common (MSVCRT.@)
|
|
*/
|
|
int CDECL _except_handler4_common( ULONG *cookie, void (*check_cookie)(void),
|
|
EXCEPTION_RECORD *rec, MSVCRT_EXCEPTION_FRAME *frame,
|
|
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
|
|
{
|
|
int retval, trylevel;
|
|
EXCEPTION_POINTERS exceptPtrs;
|
|
const SCOPETABLE_V4 *scope_table = get_scopetable_v4( frame, *cookie );
|
|
|
|
TRACE( "exception %x flags=%x at %p handler=%p %p %p cookie=%x scope table=%p cookies=%d/%x,%d/%x\n",
|
|
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
|
|
frame->handler, context, dispatcher, *cookie, scope_table,
|
|
scope_table->gs_cookie_offset, scope_table->gs_cookie_xor,
|
|
scope_table->eh_cookie_offset, scope_table->eh_cookie_xor );
|
|
|
|
/* FIXME: no cookie validation yet */
|
|
|
|
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
|
|
{
|
|
/* Unwinding the current frame */
|
|
msvcrt_local_unwind4( cookie, frame, -2, &frame->_ebp );
|
|
TRACE("unwound current frame, returning ExceptionContinueSearch\n");
|
|
return ExceptionContinueSearch;
|
|
}
|
|
else
|
|
{
|
|
/* Hunting for handler */
|
|
exceptPtrs.ExceptionRecord = rec;
|
|
exceptPtrs.ContextRecord = context;
|
|
*((DWORD *)frame-1) = (DWORD)&exceptPtrs;
|
|
trylevel = frame->trylevel;
|
|
|
|
while (trylevel != -2)
|
|
{
|
|
TRACE( "level %d prev %d filter %p\n", trylevel,
|
|
scope_table->entries[trylevel].previousTryLevel,
|
|
scope_table->entries[trylevel].lpfnFilter );
|
|
if (scope_table->entries[trylevel].lpfnFilter)
|
|
{
|
|
retval = call_filter( scope_table->entries[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp );
|
|
|
|
TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ?
|
|
"CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ?
|
|
"EXECUTE_HANDLER" : "CONTINUE_SEARCH");
|
|
|
|
if (retval == EXCEPTION_CONTINUE_EXECUTION)
|
|
return ExceptionContinueExecution;
|
|
|
|
if (retval == EXCEPTION_EXECUTE_HANDLER)
|
|
{
|
|
/* Unwind all higher frames, this one will handle the exception */
|
|
_global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame);
|
|
msvcrt_local_unwind4( cookie, frame, trylevel, &frame->_ebp );
|
|
|
|
/* Set our trylevel to the enclosing block, and call the __finally
|
|
* code, which won't return
|
|
*/
|
|
frame->trylevel = scope_table->entries[trylevel].previousTryLevel;
|
|
TRACE("__finally block %p\n",scope_table->entries[trylevel].lpfnHandler);
|
|
call_finally_block(scope_table->entries[trylevel].lpfnHandler, &frame->_ebp);
|
|
ERR("Returned from __finally block - expect crash!\n");
|
|
}
|
|
}
|
|
trylevel = scope_table->entries[trylevel].previousTryLevel;
|
|
}
|
|
}
|
|
TRACE("reached -2, returning ExceptionContinueSearch\n");
|
|
return ExceptionContinueSearch;
|
|
}
|
|
|
|
#endif
|
|
|
|
/******************************************************************
|
|
* __uncaught_exception
|
|
*/
|
|
BOOL CDECL __uncaught_exception(void)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|