Sweden-Number/dlls/msvcrt/except.c

373 lines
11 KiB
C

/*
* msvcrt.dll exception handling
*
* Copyright 2000 Jon Griffiths
*
* See http://www.microsoft.com/msj/0197/exception/exception.htm,
* but don't believe all of it.
*
* FIXME: Incomplete support for nested exceptions/try block cleanup.
*/
#include "config.h"
#include "ntddk.h"
#include "wine/exception.h"
#include "thread.h"
#include "msvcrt.h"
#include "msvcrt/setjmp.h"
DEFAULT_DEBUG_CHANNEL(msvcrt);
typedef void (*MSVCRT_sig_handler_func)(void);
/* VC++ extensions to Win32 SEH */
typedef struct _SCOPETABLE
{
DWORD previousTryLevel;
int (*lpfnFilter)(PEXCEPTION_POINTERS);
int (*lpfnHandler)(void);
} SCOPETABLE, *PSCOPETABLE;
typedef struct _MSVCRT_EXCEPTION_FRAME
{
EXCEPTION_FRAME *prev;
void (*handler)(PEXCEPTION_RECORD, PEXCEPTION_FRAME,
PCONTEXT, PEXCEPTION_RECORD);
PSCOPETABLE scopetable;
DWORD trylevel;
int _ebp;
PEXCEPTION_POINTERS xpointers;
} MSVCRT_EXCEPTION_FRAME;
#define TRYLEVEL_END 0xffffffff /* End of trylevel list */
#if defined(__GNUC__) && defined(__i386__)
inline static void call_finally_block( void *code_block, void *base_ptr )
{
__asm__ __volatile__ ("movl %1,%%ebp; call *%%eax" \
: : "a" (code_block), "g" (base_ptr));
}
static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec,
struct __EXCEPTION_FRAME* frame,
PCONTEXT context WINE_UNUSED,
struct __EXCEPTION_FRAME** dispatch)
{
if (rec->ExceptionFlags & 0x6)
return ExceptionContinueSearch;
*dispatch = frame;
return ExceptionCollidedUnwind;
}
#endif
/*********************************************************************
* _XcptFilter (MSVCRT.@)
*/
int _XcptFilter(int ex, PEXCEPTION_POINTERS ptr)
{
FIXME("(%d,%p)semi-stub\n", ex, ptr);
return UnhandledExceptionFilter(ptr);
}
/*********************************************************************
* _EH_prolog (MSVCRT.@)
*/
#ifdef __i386__
/* Provided for VC++ binary compatability only */
__ASM_GLOBAL_FUNC(_EH_prolog,
"pushl $0xff\n\t"
"pushl %eax\n\t"
"pushl %fs:0\n\t"
"movl %esp, %fs:0\n\t"
"movl 12(%esp), %eax\n\t"
"movl %ebp, 12(%esp)\n\t"
"leal 12(%esp), %ebp\n\t"
"pushl %eax\n\t"
"ret");
#endif
/*******************************************************************
* _global_unwind2 (MSVCRT.@)
*/
void _global_unwind2(PEXCEPTION_FRAME frame)
{
TRACE("(%p)\n",frame);
RtlUnwind( frame, 0, 0, 0 );
}
/*******************************************************************
* _local_unwind2 (MSVCRT.@)
*/
void _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame,
DWORD trylevel)
{
MSVCRT_EXCEPTION_FRAME *curframe = frame;
DWORD curtrylevel = 0xfe;
EXCEPTION_FRAME reg;
TRACE("(%p,%ld,%ld)\n",frame, frame->trylevel, trylevel);
/* Register a handler in case of a nested exception */
reg.Handler = (PEXCEPTION_HANDLER)MSVCRT_nested_handler;
reg.Prev = NtCurrentTeb()->except;
__wine_push_frame(&reg);
while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel)
{
curtrylevel = frame->scopetable[frame->trylevel].previousTryLevel;
curframe = frame;
curframe->trylevel = curtrylevel;
if (!frame->scopetable[curtrylevel].lpfnFilter)
{
ERR("__try block cleanup not implemented - expect crash!\n");
/* FIXME: Remove current frame, set ebp, call
* frame->scopetable[curtrylevel].lpfnHandler()
*/
}
}
__wine_pop_frame(&reg);
TRACE("unwound OK\n");
}
/*********************************************************************
* _except_handler2 (MSVCRT.@)
*/
int _except_handler2(PEXCEPTION_RECORD rec,
PEXCEPTION_FRAME frame,
PCONTEXT context,
PEXCEPTION_FRAME* dispatcher)
{
FIXME("exception %lx flags=%lx at %p handler=%p %p %p stub\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->Handler, context, dispatcher);
return ExceptionContinueSearch;
}
/*********************************************************************
* _except_handler3 (MSVCRT.@)
*/
int _except_handler3(PEXCEPTION_RECORD rec,
MSVCRT_EXCEPTION_FRAME* frame,
PCONTEXT context, void* dispatcher)
{
#if defined(__GNUC__) && defined(__i386__)
long retval, trylevel;
EXCEPTION_POINTERS exceptPtrs;
PSCOPETABLE pScopeTable;
TRACE("exception %lx flags=%lx at %p handler=%p %p %p semi-stub\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->handler, context, dispatcher);
__asm__ __volatile__ ("cld");
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
/* Unwinding the current frame */
_local_unwind2(frame, TRYLEVEL_END);
return ExceptionContinueSearch;
}
else
{
/* Hunting for handler */
exceptPtrs.ExceptionRecord = rec;
exceptPtrs.ContextRecord = context;
*((DWORD *)frame-1) = (DWORD)&exceptPtrs;
trylevel = frame->trylevel;
pScopeTable = frame->scopetable;
while (trylevel != TRYLEVEL_END)
{
if (pScopeTable[trylevel].lpfnFilter)
{
TRACE("filter = %p\n", pScopeTable[trylevel].lpfnFilter);
retval = pScopeTable[trylevel].lpfnFilter(&exceptPtrs);
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((PEXCEPTION_FRAME)frame);
_local_unwind2(frame, trylevel);
/* Set our trylevel to the enclosing block, and call the __finally
* code, which won't return
*/
frame->trylevel = pScopeTable->previousTryLevel;
TRACE("__finally block %p\n",pScopeTable[trylevel].lpfnHandler);
call_finally_block(pScopeTable[trylevel].lpfnHandler, &frame->_ebp);
ERR("Returned from __finally block - expect crash!\n");
}
}
trylevel = pScopeTable->previousTryLevel;
}
}
#else
TRACE("exception %lx flags=%lx at %p handler=%p %p %p stub\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->handler, context, dispatcher);
#endif
return ExceptionContinueSearch;
}
/*********************************************************************
* _abnormal_termination (MSVCRT.@)
*/
int _abnormal_termination(void)
{
FIXME("(void)stub\n");
return 0;
}
/*
* setjmp/longjmp implementation
*/
#ifdef __i386__
#define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */
typedef void (*MSVCRT_unwind_function)(const void*);
/*
* The signatures of the setjmp/longjmp functions do not match that
* declared in the setjmp header so they don't follow the regular naming
* convention to avoid conflicts.
*/
/*******************************************************************
* _setjmp (MSVCRT.@)
*/
void _MSVCRT__setjmp(_JUMP_BUFFER *jmp, CONTEXT86* context)
{
TRACE("(%p)\n",jmp);
jmp->Ebp = context->Ebp;
jmp->Ebx = context->Ebx;
jmp->Edi = context->Edi;
jmp->Esi = context->Esi;
jmp->Esp = context->Esp;
jmp->Eip = context->Eip;
jmp->Registration = (unsigned long)NtCurrentTeb()->except;
if (jmp->Registration == TRYLEVEL_END)
jmp->TryLevel = TRYLEVEL_END;
else
jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
TRACE("returning 0\n");
context->Eax=0;
}
/*******************************************************************
* _setjmp3 (MSVCRT.@)
*/
void _MSVCRT__setjmp3(_JUMP_BUFFER *jmp, int nb_args, CONTEXT86* context)
{
TRACE("(%p,%d)\n",jmp,nb_args);
jmp->Ebp = context->Ebp;
jmp->Ebx = context->Ebx;
jmp->Edi = context->Edi;
jmp->Esi = context->Esi;
jmp->Esp = context->Esp;
jmp->Eip = context->Eip;
jmp->Cookie = MSVCRT_JMP_MAGIC;
jmp->UnwindFunc = 0;
jmp->Registration = (unsigned long)NtCurrentTeb()->except;
if (jmp->Registration == TRYLEVEL_END)
{
jmp->TryLevel = TRYLEVEL_END;
}
else
{
void **args = ((void**)context->Esp)+2;
if (nb_args > 0) jmp->UnwindFunc = (unsigned long)*args++;
if (nb_args > 1) jmp->TryLevel = (unsigned long)*args++;
else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
if (nb_args > 2)
{
size_t size = (nb_args - 2) * sizeof(DWORD);
memcpy( jmp->UnwindData, args, min( size, sizeof(jmp->UnwindData) ));
}
}
TRACE("returning 0\n");
context->Eax = 0;
}
/*********************************************************************
* longjmp (MSVCRT.@)
*/
void _MSVCRT_longjmp(_JUMP_BUFFER *jmp, int retval, CONTEXT86* context)
{
unsigned long cur_frame = 0;
TRACE("(%p,%d)\n", jmp, retval);
cur_frame=(unsigned long)NtCurrentTeb()->except;
TRACE("cur_frame=%lx\n",cur_frame);
if (cur_frame != jmp->Registration)
_global_unwind2((PEXCEPTION_FRAME)jmp->Registration);
if (jmp->Registration)
{
if (!IsBadReadPtr(&jmp->Cookie, sizeof(long)) &&
jmp->Cookie == MSVCRT_JMP_MAGIC && jmp->UnwindFunc)
{
MSVCRT_unwind_function unwind_func;
unwind_func=(MSVCRT_unwind_function)jmp->UnwindFunc;
unwind_func(jmp);
}
else
_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration,
jmp->TryLevel);
}
if (!retval)
retval = 1;
TRACE("Jump to %lx returning %d\n",jmp->Eip,retval);
context->Ebp = jmp->Ebp;
context->Ebx = jmp->Ebx;
context->Edi = jmp->Edi;
context->Esi = jmp->Esi;
context->Esp = jmp->Esp;
context->Eip = jmp->Eip;
context->Eax = retval;
}
#endif /* i386 */
/*********************************************************************
* signal (MSVCRT.@)
*/
void* MSVCRT_signal(int sig, MSVCRT_sig_handler_func func)
{
FIXME("(%d %p):stub\n", sig, func);
return (void*)-1;
}
/*********************************************************************
* __CxxFrameHandler (MSVCRT.@)
*/
DWORD __CxxFrameHandler(PEXCEPTION_RECORD rec, struct __EXCEPTION_FRAME* frame,
PCONTEXT context, struct __EXCEPTION_FRAME** dispatch)
{
FIXME("(%p,%p,%p,%p):stub?\n",rec,frame,context,dispatch);
/* Copied from MSVCRT_nested_handler, I hope this is more
* or less the right thing to do
*/
if (rec->ExceptionFlags & 0x6)
return ExceptionContinueSearch;
*dispatch = frame;
return ExceptionCollidedUnwind;
}