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/*
* 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 "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "wine/exception.h"
#include "msvcrt.h"
#include "excpt.h"
#include "wincon.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
/* 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;
#define TRYLEVEL_END (-1) /* End of trylevel list */
#if defined(__GNUC__) && defined(__i386__)
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
#ifdef __i386__
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;
}
/*********************************************************************
* _EH_prolog (MSVCRT.@)
*/
/* Provided for VC++ binary compatibility only */
__ASM_GLOBAL_FUNC(_EH_prolog,
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") /* skip ret addr */
"pushl $-1\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl %fs:0\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\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"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"ret")
static void msvcrt_local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp)
{
EXCEPTION_REGISTRATION_RECORD reg;
TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel);
/* Register a handler in case of a nested exception */
reg.Handler = MSVCRT_nested_handler;
reg.Prev = NtCurrentTeb()->Tib.ExceptionList;
__wine_push_frame(&reg);
while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel)
{
int level = frame->trylevel;
frame->trylevel = frame->scopetable[level].previousTryLevel;
if (!frame->scopetable[level].lpfnFilter)
{
TRACE( "__try block cleanup level %d handler %p ebp %p\n",
level, frame->scopetable[level].lpfnHandler, ebp );
call_unwind_func( frame->scopetable[level].lpfnHandler, ebp );
}
}
__wine_pop_frame(&reg);
TRACE("unwound OK\n");
}
/*******************************************************************
* _local_unwind2 (MSVCRT.@)
*/
void CDECL _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel)
{
msvcrt_local_unwind2( frame, trylevel, &frame->_ebp );
}
#endif /* __i386__ */
/*******************************************************************
* _global_unwind2 (MSVCRT.@)
*/
void CDECL _global_unwind2(EXCEPTION_REGISTRATION_RECORD* frame)
{
TRACE("(%p)\n",frame);
RtlUnwind( frame, 0, 0, 0 );
}
/*********************************************************************
* _except_handler2 (MSVCRT.@)
*/
int CDECL _except_handler2(PEXCEPTION_RECORD rec,
EXCEPTION_REGISTRATION_RECORD* frame,
PCONTEXT context,
EXCEPTION_REGISTRATION_RECORD** dispatcher)
{
FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->Handler, context, dispatcher);
return ExceptionContinueSearch;
}
/*********************************************************************
* _except_handler3 (MSVCRT.@)
*/
int CDECL _except_handler3(PEXCEPTION_RECORD rec,
MSVCRT_EXCEPTION_FRAME* frame,
PCONTEXT context, void* dispatcher)
{
#if defined(__GNUC__) && defined(__i386__)
int retval, trylevel;
EXCEPTION_POINTERS exceptPtrs;
PSCOPETABLE pScopeTable;
TRACE("exception %x flags=%x 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 */
msvcrt_local_unwind2(frame, TRYLEVEL_END, &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;
pScopeTable = frame->scopetable;
while (trylevel != TRYLEVEL_END)
{
TRACE( "level %d prev %d filter %p\n", trylevel, pScopeTable[trylevel].previousTryLevel,
pScopeTable[trylevel].lpfnFilter );
if (pScopeTable[trylevel].lpfnFilter)
{
retval = call_filter( pScopeTable[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_unwind2(frame, trylevel, &frame->_ebp);
/* Set our trylevel to the enclosing block, and call the __finally
* code, which won't return
*/
frame->trylevel = pScopeTable[trylevel].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[trylevel].previousTryLevel;
}
}
#else
FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->handler, context, dispatcher);
#endif
TRACE("reached TRYLEVEL_END, returning ExceptionContinueSearch\n");
return ExceptionContinueSearch;
}
/*********************************************************************
* _abnormal_termination (MSVCRT.@)
*/
int CDECL _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 (__stdcall *MSVCRT_unwind_function)(const struct MSVCRT___JUMP_BUFFER *);
/* define an entrypoint for setjmp/setjmp3 that stores the registers in the jmp buf */
/* and then jumps to the C backend function */
#define DEFINE_SETJMP_ENTRYPOINT(name) \
__ASM_GLOBAL_FUNC( name, \
"movl 4(%esp),%ecx\n\t" /* jmp_buf */ \
"movl %ebp,0(%ecx)\n\t" /* jmp_buf.Ebp */ \
"movl %ebx,4(%ecx)\n\t" /* jmp_buf.Ebx */ \
"movl %edi,8(%ecx)\n\t" /* jmp_buf.Edi */ \
"movl %esi,12(%ecx)\n\t" /* jmp_buf.Esi */ \
"movl %esp,16(%ecx)\n\t" /* jmp_buf.Esp */ \
"movl 0(%esp),%eax\n\t" \
"movl %eax,20(%ecx)\n\t" /* jmp_buf.Eip */ \
"jmp " __ASM_NAME("__regs_") # name )
/* restore the registers from the jmp buf upon longjmp */
extern void DECLSPEC_NORETURN longjmp_set_regs( struct MSVCRT___JUMP_BUFFER *jmp, int retval );
__ASM_GLOBAL_FUNC( longjmp_set_regs,
"movl 4(%esp),%ecx\n\t" /* jmp_buf */
"movl 8(%esp),%eax\n\t" /* retval */
"movl 0(%ecx),%ebp\n\t" /* jmp_buf.Ebp */
"movl 4(%ecx),%ebx\n\t" /* jmp_buf.Ebx */
"movl 8(%ecx),%edi\n\t" /* jmp_buf.Edi */
"movl 12(%ecx),%esi\n\t" /* jmp_buf.Esi */
"movl 16(%ecx),%esp\n\t" /* jmp_buf.Esp */
"addl $4,%esp\n\t" /* get rid of return address */
"jmp *20(%ecx)\n\t" /* jmp_buf.Eip */ )
/*
* 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.@)
*/
DEFINE_SETJMP_ENTRYPOINT(MSVCRT__setjmp)
int CDECL __regs_MSVCRT__setjmp(struct MSVCRT___JUMP_BUFFER *jmp)
{
jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
if (jmp->Registration == ~0UL)
jmp->TryLevel = TRYLEVEL_END;
else
jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
return 0;
}
/*******************************************************************
* _setjmp3 (MSVCRT.@)
*/
DEFINE_SETJMP_ENTRYPOINT( MSVCRT__setjmp3 )
int CDECL __regs_MSVCRT__setjmp3(struct MSVCRT___JUMP_BUFFER *jmp, int nb_args, ...)
{
jmp->Cookie = MSVCRT_JMP_MAGIC;
jmp->UnwindFunc = 0;
jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
if (jmp->Registration == ~0UL)
{
jmp->TryLevel = TRYLEVEL_END;
}
else
{
int i;
va_list args;
va_start( args, nb_args );
if (nb_args > 0) jmp->UnwindFunc = va_arg( args, unsigned long );
if (nb_args > 1) jmp->TryLevel = va_arg( args, unsigned long );
else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
for (i = 0; i < 6 && i < nb_args - 2; i++)
jmp->UnwindData[i] = va_arg( args, unsigned long );
va_end( args );
}
TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
return 0;
}
/*********************************************************************
* longjmp (MSVCRT.@)
*/
int CDECL MSVCRT_longjmp(struct MSVCRT___JUMP_BUFFER *jmp, int retval)
{
unsigned long cur_frame = 0;
TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx retval=%08x\n",
jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration, retval );
cur_frame=(unsigned long)NtCurrentTeb()->Tib.ExceptionList;
TRACE("cur_frame=%lx\n",cur_frame);
if (cur_frame != jmp->Registration)
_global_unwind2((EXCEPTION_REGISTRATION_RECORD*)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
msvcrt_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration,
jmp->TryLevel, (void *)jmp->Ebp);
}
if (!retval)
retval = 1;
longjmp_set_regs( jmp, retval );
}
/*********************************************************************
* _seh_longjmp_unwind (MSVCRT.@)
*/
void __stdcall _seh_longjmp_unwind(struct MSVCRT___JUMP_BUFFER *jmp)
{
msvcrt_local_unwind2( (MSVCRT_EXCEPTION_FRAME *)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp );
}
#endif /* i386 */
static MSVCRT___sighandler_t sighandlers[MSVCRT_NSIG] = { MSVCRT_SIG_DFL };
static BOOL WINAPI msvcrt_console_handler(DWORD ctrlType)
{
BOOL ret = FALSE;
switch (ctrlType)
{
case CTRL_C_EVENT:
if (sighandlers[MSVCRT_SIGINT])
{
if (sighandlers[MSVCRT_SIGINT] != MSVCRT_SIG_IGN)
sighandlers[MSVCRT_SIGINT](MSVCRT_SIGINT);
ret = TRUE;
}
break;
}
return ret;
}
typedef void (*float_handler)(int, int);
/* The exception codes are actually NTSTATUS values */
static const struct
{
NTSTATUS status;
int signal;
} float_exception_map[] = {
{ EXCEPTION_FLT_DENORMAL_OPERAND, MSVCRT__FPE_DENORMAL },
{ EXCEPTION_FLT_DIVIDE_BY_ZERO, MSVCRT__FPE_ZERODIVIDE },
{ EXCEPTION_FLT_INEXACT_RESULT, MSVCRT__FPE_INEXACT },
{ EXCEPTION_FLT_INVALID_OPERATION, MSVCRT__FPE_INVALID },
{ EXCEPTION_FLT_OVERFLOW, MSVCRT__FPE_OVERFLOW },
{ EXCEPTION_FLT_STACK_CHECK, MSVCRT__FPE_STACKOVERFLOW },
{ EXCEPTION_FLT_UNDERFLOW, MSVCRT__FPE_UNDERFLOW },
};
static LONG WINAPI msvcrt_exception_filter(struct _EXCEPTION_POINTERS *except)
{
LONG ret = EXCEPTION_CONTINUE_SEARCH;
MSVCRT___sighandler_t handler;
if (!except || !except->ExceptionRecord)
return EXCEPTION_CONTINUE_SEARCH;
switch (except->ExceptionRecord->ExceptionCode)
{
case EXCEPTION_ACCESS_VIOLATION:
if ((handler = sighandlers[MSVCRT_SIGSEGV]) != MSVCRT_SIG_DFL)
{
if (handler != MSVCRT_SIG_IGN)
{
sighandlers[MSVCRT_SIGSEGV] = MSVCRT_SIG_DFL;
handler(MSVCRT_SIGSEGV);
}
ret = EXCEPTION_CONTINUE_EXECUTION;
}
break;
/* According to msdn,
* the FPE signal handler takes as a second argument the type of
* floating point exception.
*/
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:
if ((handler = sighandlers[MSVCRT_SIGFPE]) != MSVCRT_SIG_DFL)
{
if (handler != MSVCRT_SIG_IGN)
{
unsigned int i;
int float_signal = MSVCRT__FPE_INVALID;
sighandlers[MSVCRT_SIGFPE] = MSVCRT_SIG_DFL;
for (i = 0; i < sizeof(float_exception_map) /
sizeof(float_exception_map[0]); i++)
{
if (float_exception_map[i].status ==
except->ExceptionRecord->ExceptionCode)
{
float_signal = float_exception_map[i].signal;
break;
}
}
((float_handler)handler)(MSVCRT_SIGFPE, float_signal);
}
ret = EXCEPTION_CONTINUE_EXECUTION;
}
break;
case EXCEPTION_ILLEGAL_INSTRUCTION:
case EXCEPTION_PRIV_INSTRUCTION:
if ((handler = sighandlers[MSVCRT_SIGILL]) != MSVCRT_SIG_DFL)
{
if (handler != MSVCRT_SIG_IGN)
{
sighandlers[MSVCRT_SIGILL] = MSVCRT_SIG_DFL;
handler(MSVCRT_SIGILL);
}
ret = EXCEPTION_CONTINUE_EXECUTION;
}
break;
}
return ret;
}
void msvcrt_init_signals(void)
{
SetConsoleCtrlHandler(msvcrt_console_handler, TRUE);
SetUnhandledExceptionFilter(msvcrt_exception_filter);
}
void msvcrt_free_signals(void)
{
SetConsoleCtrlHandler(msvcrt_console_handler, FALSE);
SetUnhandledExceptionFilter(NULL);
}
/*********************************************************************
* signal (MSVCRT.@)
* Some signals may never be generated except through an explicit call to
* raise.
*/
MSVCRT___sighandler_t CDECL MSVCRT_signal(int sig, MSVCRT___sighandler_t func)
{
MSVCRT___sighandler_t ret = MSVCRT_SIG_ERR;
TRACE("(%d, %p)\n", sig, func);
if (func == MSVCRT_SIG_ERR) return MSVCRT_SIG_ERR;
switch (sig)
{
/* Cases handled internally. Note SIGTERM is never generated by Windows,
* so we effectively mask it.
*/
case MSVCRT_SIGABRT:
case MSVCRT_SIGFPE:
case MSVCRT_SIGILL:
case MSVCRT_SIGSEGV:
case MSVCRT_SIGINT:
case MSVCRT_SIGTERM:
case MSVCRT_SIGBREAK:
ret = sighandlers[sig];
sighandlers[sig] = func;
break;
default:
ret = MSVCRT_SIG_ERR;
}
return ret;
}
/*********************************************************************
* raise (MSVCRT.@)
*/
int CDECL MSVCRT_raise(int sig)
{
MSVCRT___sighandler_t handler;
TRACE("(%d)\n", sig);
switch (sig)
{
case MSVCRT_SIGABRT:
case MSVCRT_SIGFPE:
case MSVCRT_SIGILL:
case MSVCRT_SIGSEGV:
case MSVCRT_SIGINT:
case MSVCRT_SIGTERM:
case MSVCRT_SIGBREAK:
handler = sighandlers[sig];
if (handler == MSVCRT_SIG_DFL) MSVCRT__exit(3);
if (handler != MSVCRT_SIG_IGN)
{
sighandlers[sig] = MSVCRT_SIG_DFL;
if (sig == MSVCRT_SIGFPE)
((float_handler)handler)(sig, MSVCRT__FPE_EXPLICITGEN);
else
handler(sig);
}
break;
default:
return -1;
}
return 0;
}
/*********************************************************************
* _XcptFilter (MSVCRT.@)
*/
int CDECL _XcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
{
TRACE("(%08x,%p)\n", ex, ptr);
/* I assume ptr->ExceptionRecord->ExceptionCode is the same as ex */
return msvcrt_exception_filter(ptr);
}
/******************************************************************
* MSVCRT___uncaught_exception
*/
BOOL CDECL MSVCRT___uncaught_exception(void)
{
return FALSE;
}
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