dlls/msvcrt/except.c

   1 /*
   2  * msvcrt.dll exception handling
   3  *
   4  * Copyright 2000 Jon Griffiths
   5  * Copyright 2005 Juan Lang
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * FIXME: Incomplete support for nested exceptions/try block cleanup.
  22  */
  23
  24 #include "config.h"
  25 #include "wine/port.h"
  26
  27 #include <stdarg.h>
  28
  29 #include "ntstatus.h"
  30 #define WIN32_NO_STATUS
  31 #include "windef.h"
  32 #include "winbase.h"
  33 #include "winternl.h"
  34 #include "wine/exception.h"
  35 #include "msvcrt.h"
  36 #include "excpt.h"
  37 #include "wincon.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  41
  42 static MSVCRT_security_error_handler security_error_handler;
  43
  44 static MSVCRT___sighandler_t sighandlers[MSVCRT_NSIG] = { MSVCRT_SIG_DFL };
  45
  46 static BOOL WINAPI msvcrt_console_handler(DWORD ctrlType)
  47 {
  48     BOOL ret = FALSE;
  49
  50     switch (ctrlType)
  51     {
  52     case CTRL_C_EVENT:
  53         if (sighandlers[MSVCRT_SIGINT])
  54         {
  55             if (sighandlers[MSVCRT_SIGINT] != MSVCRT_SIG_IGN)
  56                 sighandlers[MSVCRT_SIGINT](MSVCRT_SIGINT);
  57             ret = TRUE;
  58         }
  59         break;
  60     }
  61     return ret;
  62 }
  63
  64 /*********************************************************************
  65  *              __pxcptinfoptrs (MSVCRT.@)
  66  */
  67 void** CDECL MSVCRT___pxcptinfoptrs(void)
  68 {
  69     return (void**)&msvcrt_get_thread_data()->xcptinfo;
  70 }
  71
  72 typedef void (CDECL *float_handler)(int, int);
  73
  74 /* The exception codes are actually NTSTATUS values */
  75 static const struct
  76 {
  77     NTSTATUS status;
  78     int signal;
  79 } float_exception_map[] = {
  80  { EXCEPTION_FLT_DENORMAL_OPERAND, MSVCRT__FPE_DENORMAL },
  81  { EXCEPTION_FLT_DIVIDE_BY_ZERO, MSVCRT__FPE_ZERODIVIDE },
  82  { EXCEPTION_FLT_INEXACT_RESULT, MSVCRT__FPE_INEXACT },
  83  { EXCEPTION_FLT_INVALID_OPERATION, MSVCRT__FPE_INVALID },
  84  { EXCEPTION_FLT_OVERFLOW, MSVCRT__FPE_OVERFLOW },
  85  { EXCEPTION_FLT_STACK_CHECK, MSVCRT__FPE_STACKOVERFLOW },
  86  { EXCEPTION_FLT_UNDERFLOW, MSVCRT__FPE_UNDERFLOW },
  87 };
  88
  89 static LONG msvcrt_exception_filter(struct _EXCEPTION_POINTERS *except)
  90 {
  91     LONG ret = EXCEPTION_CONTINUE_SEARCH;
  92     MSVCRT___sighandler_t handler;
  93
  94     if (!except || !except->ExceptionRecord)
  95         return EXCEPTION_CONTINUE_SEARCH;
  96
  97     switch (except->ExceptionRecord->ExceptionCode)
  98     {
  99     case EXCEPTION_ACCESS_VIOLATION:
 100         if ((handler = sighandlers[MSVCRT_SIGSEGV]) != MSVCRT_SIG_DFL)
 101         {
 102             if (handler != MSVCRT_SIG_IGN)
 103             {
 104                 EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)MSVCRT___pxcptinfoptrs(), *old_ep;
 105
 106                 old_ep = *ep;
 107                 *ep = except;
 108                 sighandlers[MSVCRT_SIGSEGV] = MSVCRT_SIG_DFL;
 109                 handler(MSVCRT_SIGSEGV);
 110                 *ep = old_ep;
 111             }
 112             ret = EXCEPTION_CONTINUE_EXECUTION;
 113         }
 114         break;
 115     /* According to msdn,
 116      * the FPE signal handler takes as a second argument the type of
 117      * floating point exception.
 118      */
 119     case EXCEPTION_FLT_DENORMAL_OPERAND:
 120     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
 121     case EXCEPTION_FLT_INEXACT_RESULT:
 122     case EXCEPTION_FLT_INVALID_OPERATION:
 123     case EXCEPTION_FLT_OVERFLOW:
 124     case EXCEPTION_FLT_STACK_CHECK:
 125     case EXCEPTION_FLT_UNDERFLOW:
 126         if ((handler = sighandlers[MSVCRT_SIGFPE]) != MSVCRT_SIG_DFL)
 127         {
 128             if (handler != MSVCRT_SIG_IGN)
 129             {
 130                 EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)MSVCRT___pxcptinfoptrs(), *old_ep;
 131                 unsigned int i;
 132                 int float_signal = MSVCRT__FPE_INVALID;
 133
 134                 sighandlers[MSVCRT_SIGFPE] = MSVCRT_SIG_DFL;
 135                 for (i = 0; i < sizeof(float_exception_map) /
 136                          sizeof(float_exception_map[0]); i++)
 137                 {
 138                     if (float_exception_map[i].status ==
 139                         except->ExceptionRecord->ExceptionCode)
 140                     {
 141                         float_signal = float_exception_map[i].signal;
 142                         break;
 143                     }
 144                 }
 145
 146                 old_ep = *ep;
 147                 *ep = except;
 148                 ((float_handler)handler)(MSVCRT_SIGFPE, float_signal);
 149                 *ep = old_ep;
 150             }
 151             ret = EXCEPTION_CONTINUE_EXECUTION;
 152         }
 153         break;
 154     case EXCEPTION_ILLEGAL_INSTRUCTION:
 155     case EXCEPTION_PRIV_INSTRUCTION:
 156         if ((handler = sighandlers[MSVCRT_SIGILL]) != MSVCRT_SIG_DFL)
 157         {
 158             if (handler != MSVCRT_SIG_IGN)
 159             {
 160                 EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)MSVCRT___pxcptinfoptrs(), *old_ep;
 161
 162                 old_ep = *ep;
 163                 *ep = except;
 164                 sighandlers[MSVCRT_SIGILL] = MSVCRT_SIG_DFL;
 165                 handler(MSVCRT_SIGILL);
 166                 *ep = old_ep;
 167             }
 168             ret = EXCEPTION_CONTINUE_EXECUTION;
 169         }
 170         break;
 171     }
 172     return ret;
 173 }
 174
 175 void msvcrt_init_signals(void)
 176 {
 177     SetConsoleCtrlHandler(msvcrt_console_handler, TRUE);
 178 }
 179
 180 void msvcrt_free_signals(void)
 181 {
 182     SetConsoleCtrlHandler(msvcrt_console_handler, FALSE);
 183 }
 184
 185 /*********************************************************************
 186  *              signal (MSVCRT.@)
 187  * Some signals may never be generated except through an explicit call to
 188  * raise.
 189  */
 190 MSVCRT___sighandler_t CDECL MSVCRT_signal(int sig, MSVCRT___sighandler_t func)
 191 {
 192     MSVCRT___sighandler_t ret = MSVCRT_SIG_ERR;
 193
 194     TRACE("(%d, %p)\n", sig, func);
 195
 196     if (func == MSVCRT_SIG_ERR) return MSVCRT_SIG_ERR;
 197
 198     switch (sig)
 199     {
 200     /* Cases handled internally.  Note SIGTERM is never generated by Windows,
 201      * so we effectively mask it.
 202      */
 203     case MSVCRT_SIGABRT:
 204     case MSVCRT_SIGFPE:
 205     case MSVCRT_SIGILL:
 206     case MSVCRT_SIGSEGV:
 207     case MSVCRT_SIGINT:
 208     case MSVCRT_SIGTERM:
 209     case MSVCRT_SIGBREAK:
 210         ret = sighandlers[sig];
 211         sighandlers[sig] = func;
 212         break;
 213     default:
 214         ret = MSVCRT_SIG_ERR;
 215     }
 216     return ret;
 217 }
 218
 219 /*********************************************************************
 220  *              raise (MSVCRT.@)
 221  */
 222 int CDECL MSVCRT_raise(int sig)
 223 {
 224     MSVCRT___sighandler_t handler;
 225
 226     TRACE("(%d)\n", sig);
 227
 228     switch (sig)
 229     {
 230     case MSVCRT_SIGFPE:
 231     case MSVCRT_SIGILL:
 232     case MSVCRT_SIGSEGV:
 233         handler = sighandlers[sig];
 234         if (handler == MSVCRT_SIG_DFL) MSVCRT__exit(3);
 235         if (handler != MSVCRT_SIG_IGN)
 236         {
 237             EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)MSVCRT___pxcptinfoptrs(), *old_ep;
 238
 239             sighandlers[sig] = MSVCRT_SIG_DFL;
 240
 241             old_ep = *ep;
 242             *ep = NULL;
 243             if (sig == MSVCRT_SIGFPE)
 244                 ((float_handler)handler)(sig, MSVCRT__FPE_EXPLICITGEN);
 245             else
 246                 handler(sig);
 247             *ep = old_ep;
 248         }
 249         break;
 250     case MSVCRT_SIGABRT:
 251     case MSVCRT_SIGINT:
 252     case MSVCRT_SIGTERM:
 253     case MSVCRT_SIGBREAK:
 254         handler = sighandlers[sig];
 255         if (handler == MSVCRT_SIG_DFL) MSVCRT__exit(3);
 256         if (handler != MSVCRT_SIG_IGN)
 257         {
 258             sighandlers[sig] = MSVCRT_SIG_DFL;
 259             handler(sig);
 260         }
 261         break;
 262     default:
 263         return -1;
 264     }
 265     return 0;
 266 }
 267
 268 /*********************************************************************
 269  *              _XcptFilter (MSVCRT.@)
 270  */
 271 int CDECL _XcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
 272 {
 273     TRACE("(%08x,%p)\n", ex, ptr);
 274     /* I assume ptr->ExceptionRecord->ExceptionCode is the same as ex */
 275     return msvcrt_exception_filter(ptr);
 276 }
 277
 278 /*********************************************************************
 279  *              _abnormal_termination (MSVCRT.@)
 280  */
 281 int CDECL _abnormal_termination(void)
 282 {
 283   FIXME("(void)stub\n");
 284   return 0;
 285 }
 286
 287 /******************************************************************
 288  *              __uncaught_exception (MSVCRT.@)
 289  */
 290 BOOL CDECL MSVCRT___uncaught_exception(void)
 291 {
 292     return FALSE;
 293 }
 294
 295 /*********************************************************************
 296  *              _set_security_error_handler (MSVCR70.@)
 297  */
 298 MSVCRT_security_error_handler CDECL _set_security_error_handler(
 299     MSVCRT_security_error_handler handler )
 300 {
 301     MSVCRT_security_error_handler old = security_error_handler;
 302
 303     TRACE("(%p)\n", handler);
 304
 305     security_error_handler = handler;
 306     return old;
 307 }
 308
 309 /*********************************************************************
 310  *              __security_error_handler (MSVCR70.@)
 311  */
 312 void CDECL __security_error_handler(int code, void *data)
 313 {
 314     if(security_error_handler)
 315         security_error_handler(code, data);
 316     else
 317         FIXME("(%d, %p) stub\n", code, data);
 318
 319     MSVCRT__exit(3);
 320 }
 321
 322 /*********************************************************************
 323  *  __crtSetUnhandledExceptionFilter (MSVCR110.@)
 324  */
 325 LPTOP_LEVEL_EXCEPTION_FILTER CDECL MSVCR110__crtSetUnhandledExceptionFilter(LPTOP_LEVEL_EXCEPTION_FILTER filter)
 326 {
 327     return SetUnhandledExceptionFilter(filter);
 328 }