LCOV - code coverage report
Current view: directory - toolkit/xre - nsSigHandlers.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 67 25 37.3 %
Date: 2012-06-02 Functions: 6 1 16.7 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Communicator client code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *   Jerry.Kirk@Nexwarecorp.com
      24                 :  *   Chris Seawood <cls@seawood.org>
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : /*
      41                 :  * This module is supposed to abstract signal handling away from the other
      42                 :  * platforms that do not support it.
      43                 :  */
      44                 : 
      45                 : #include "nsSigHandlers.h"
      46                 : 
      47                 : #ifdef XP_UNIX
      48                 : 
      49                 : #include <signal.h>
      50                 : #include <stdio.h>
      51                 : #include <string.h>
      52                 : #include "prthread.h"
      53                 : #include "plstr.h"
      54                 : #include "prenv.h"
      55                 : #include "nsDebug.h"
      56                 : #include "nsXULAppAPI.h"
      57                 : 
      58                 : #if defined(LINUX)
      59                 : #include <sys/time.h>
      60                 : #include <sys/resource.h>
      61                 : #include <unistd.h>
      62                 : #include <stdlib.h> // atoi
      63                 : #ifndef ANDROID // no Android impl
      64                 : #  include <ucontext.h>
      65                 : #endif
      66                 : #endif
      67                 : 
      68                 : #if defined(SOLARIS)
      69                 : #include <sys/resource.h>
      70                 : #include <ucontext.h>
      71                 : #endif
      72                 : 
      73                 : static char _progname[1024] = "huh?";
      74                 : static unsigned int _gdb_sleep_duration = 300;
      75                 : 
      76                 : // NB: keep me up to date with the same variable in
      77                 : // ipc/chromium/chrome/common/ipc_channel_posix.cc
      78                 : static const int kClientChannelFd = 3;
      79                 : 
      80                 : #if defined(LINUX) && defined(DEBUG) && \
      81                 :       (defined(__i386) || defined(__x86_64) || defined(PPC))
      82                 : #define CRAWL_STACK_ON_SIGSEGV
      83                 : #endif
      84                 : 
      85                 : #if defined(CRAWL_STACK_ON_SIGSEGV)
      86                 : 
      87                 : #include <unistd.h>
      88                 : #include "nsISupportsUtils.h"
      89                 : #include "nsStackWalk.h"
      90                 : 
      91                 : extern "C" {
      92                 : 
      93               0 : static void PrintStackFrame(void *aPC, void *aClosure)
      94                 : {
      95                 :   char buf[1024];
      96                 :   nsCodeAddressDetails details;
      97                 : 
      98               0 :   NS_DescribeCodeAddress(aPC, &details);
      99               0 :   NS_FormatCodeAddressDetails(aPC, &details, buf, sizeof(buf));
     100               0 :   fputs(buf, stdout);
     101               0 : }
     102                 : 
     103                 : }
     104                 : 
     105                 : void
     106               0 : ah_crap_handler(int signum)
     107                 : {
     108                 :   printf("\nProgram %s (pid = %d) received signal %d.\n",
     109                 :          _progname,
     110                 :          getpid(),
     111               0 :          signum);
     112                 : 
     113               0 :   printf("Stack:\n");
     114               0 :   NS_StackWalk(PrintStackFrame, 2, nsnull, 0);
     115                 : 
     116               0 :   printf("Sleeping for %d seconds.\n",_gdb_sleep_duration);
     117                 :   printf("Type 'gdb %s %d' to attach your debugger to this thread.\n",
     118                 :          _progname,
     119               0 :          getpid());
     120                 : 
     121               0 :   sleep(_gdb_sleep_duration);
     122                 : 
     123               0 :   printf("Done sleeping...\n");
     124                 : 
     125               0 :   _exit(signum);
     126                 : }
     127                 : 
     128                 : void
     129               0 : child_ah_crap_handler(int signum)
     130                 : {
     131               0 :   if (!getenv("MOZ_DONT_UNBLOCK_PARENT_ON_CHILD_CRASH"))
     132               0 :     close(kClientChannelFd);
     133               0 :   ah_crap_handler(signum);
     134               0 : }
     135                 : 
     136                 : #endif // CRAWL_STACK_ON_SIGSEGV
     137                 : 
     138                 : #ifdef MOZ_WIDGET_GTK2
     139                 : // Need this include for version test below.
     140                 : #include <glib.h>
     141                 : #endif
     142                 : 
     143                 : #if defined(MOZ_WIDGET_GTK2) && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
     144                 : 
     145                 : static GLogFunc orig_log_func = NULL;
     146                 : 
     147                 : extern "C" {
     148                 : static void
     149                 : my_glib_log_func(const gchar *log_domain, GLogLevelFlags log_level,
     150                 :                  const gchar *message, gpointer user_data);
     151                 : }
     152                 : 
     153                 : /* static */ void
     154               0 : my_glib_log_func(const gchar *log_domain, GLogLevelFlags log_level,
     155                 :                  const gchar *message, gpointer user_data)
     156                 : {
     157               0 :   if (log_level & (G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION)) {
     158               0 :     NS_DebugBreak(NS_DEBUG_ASSERTION, message, "glib assertion", __FILE__, __LINE__);
     159               0 :   } else if (log_level & (G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING)) {
     160               0 :     NS_DebugBreak(NS_DEBUG_WARNING, message, "glib warning", __FILE__, __LINE__);
     161                 :   }
     162                 : 
     163               0 :   orig_log_func(log_domain, log_level, message, NULL);
     164               0 : }
     165                 : 
     166                 : #endif
     167                 : 
     168                 : #ifdef SA_SIGINFO
     169               0 : static void fpehandler(int signum, siginfo_t *si, void *context)
     170                 : {
     171                 :   /* Integer divide by zero or integer overflow. */
     172                 :   /* Note: FPE_INTOVF is ignored on Intel, PowerPC and SPARC systems. */
     173               0 :   if (si->si_code == FPE_INTDIV || si->si_code == FPE_INTOVF) {
     174               0 :     NS_DebugBreak(NS_DEBUG_ABORT, "Divide by zero", nsnull, __FILE__, __LINE__);
     175                 :   }
     176                 : 
     177                 : #ifdef XP_MACOSX
     178                 :   ucontext_t *uc = (ucontext_t *)context;
     179                 : 
     180                 : #if defined(__i386__) || defined(__amd64__)
     181                 :   _STRUCT_FP_CONTROL *ctrl = &uc->uc_mcontext->__fs.__fpu_fcw;
     182                 :   ctrl->__invalid = ctrl->__denorm = ctrl->__zdiv = ctrl->__ovrfl = ctrl->__undfl = ctrl->__precis = 1;
     183                 : 
     184                 :   _STRUCT_FP_STATUS *status = &uc->uc_mcontext->__fs.__fpu_fsw;
     185                 :   status->__invalid = status->__denorm = status->__zdiv = status->__ovrfl = status->__undfl =
     186                 :     status->__precis = status->__stkflt = status->__errsumm = 0;
     187                 : 
     188                 :   __uint32_t *mxcsr = &uc->uc_mcontext->__fs.__fpu_mxcsr;
     189                 :   *mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
     190                 :   *mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
     191                 : #endif
     192                 : #endif
     193                 : #if defined(LINUX) && !defined(ANDROID)
     194               0 :   ucontext_t *uc = (ucontext_t *)context;
     195                 : 
     196                 : #if defined(__i386__)
     197                 :   /*
     198                 :    * It seems that we have no access to mxcsr on Linux. libc
     199                 :    * seems to be translating cw/sw to mxcsr.
     200                 :    */
     201               0 :   unsigned long int *cw = &uc->uc_mcontext.fpregs->cw;
     202               0 :   *cw |= FPU_EXCEPTION_MASK;
     203                 : 
     204               0 :   unsigned long int *sw = &uc->uc_mcontext.fpregs->sw;
     205               0 :   *sw &= ~FPU_STATUS_FLAGS;
     206                 : #endif
     207                 : #if defined(__amd64__)
     208                 :   __uint16_t *cw = &uc->uc_mcontext.fpregs->cwd;
     209                 :   *cw |= FPU_EXCEPTION_MASK;
     210                 : 
     211                 :   __uint16_t *sw = &uc->uc_mcontext.fpregs->swd;
     212                 :   *sw &= ~FPU_STATUS_FLAGS;
     213                 : 
     214                 :   __uint32_t *mxcsr = &uc->uc_mcontext.fpregs->mxcsr;
     215                 :   *mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
     216                 :   *mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
     217                 : #endif
     218                 : #endif
     219                 : #ifdef SOLARIS
     220                 :   ucontext_t *uc = (ucontext_t *)context;
     221                 : 
     222                 : #if defined(__i386)
     223                 :   uint32_t *cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[0];
     224                 :   *cw |= FPU_EXCEPTION_MASK;
     225                 : 
     226                 :   uint32_t *sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[1];
     227                 :   *sw &= ~FPU_STATUS_FLAGS;
     228                 : 
     229                 :   /* address of the instruction that caused the exception */
     230                 :   uint32_t *ip = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[3];
     231                 :   uc->uc_mcontext.gregs[REG_PC] = *ip;
     232                 : #endif
     233                 : #if defined(__amd64__)
     234                 :   uint16_t *cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.cw;
     235                 :   *cw |= FPU_EXCEPTION_MASK;
     236                 : 
     237                 :   uint16_t *sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.sw;
     238                 :   *sw &= ~FPU_STATUS_FLAGS;
     239                 : 
     240                 :   uint32_t *mxcsr = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.mxcsr;
     241                 :   *mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
     242                 :   *mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
     243                 : #endif
     244                 : #endif
     245               0 : }
     246                 : #endif
     247                 : 
     248              24 : void InstallSignalHandlers(const char *ProgramName)
     249                 : {
     250              24 :   PL_strncpy(_progname,ProgramName, (sizeof(_progname)-1) );
     251                 : 
     252              24 :   const char *gdbSleep = PR_GetEnv("MOZ_GDB_SLEEP");
     253              24 :   if (gdbSleep && *gdbSleep)
     254                 :   {
     255                 :     unsigned int s;
     256               0 :     if (1 == sscanf(gdbSleep, "%u", &s)) {
     257               0 :       _gdb_sleep_duration = s;
     258                 :     }
     259                 :   }
     260                 : 
     261                 : #if defined(CRAWL_STACK_ON_SIGSEGV)
     262              24 :   if (!getenv("XRE_NO_WINDOWS_CRASH_DIALOG")) {
     263                 :     void (*crap_handler)(int) =
     264               2 :       GeckoProcessType_Default != XRE_GetProcessType() ?
     265                 :           child_ah_crap_handler :
     266               2 :           ah_crap_handler;
     267               2 :     signal(SIGSEGV, crap_handler);
     268               2 :     signal(SIGILL, crap_handler);
     269               2 :     signal(SIGABRT, crap_handler);
     270                 :   }
     271                 : #endif // CRAWL_STACK_ON_SIGSEGV
     272                 : 
     273                 : #ifdef SA_SIGINFO
     274                 :   /* Install a handler for floating point exceptions and disable them if they occur. */
     275                 :   struct sigaction sa, osa;
     276              24 :   sa.sa_flags = SA_ONSTACK | SA_RESTART | SA_SIGINFO;
     277              24 :   sa.sa_sigaction = fpehandler;
     278              24 :   sigemptyset(&sa.sa_mask);
     279              24 :   sigaction(SIGFPE, &sa, &osa);
     280                 : #endif
     281                 : 
     282                 : #if defined(DEBUG) && defined(LINUX)
     283              24 :   const char *memLimit = PR_GetEnv("MOZ_MEM_LIMIT");
     284              24 :   if (memLimit && *memLimit)
     285                 :   {
     286               0 :     long m = atoi(memLimit);
     287               0 :     m *= (1024*1024);
     288                 :     struct rlimit r;
     289               0 :     r.rlim_cur = m;
     290               0 :     r.rlim_max = m;
     291               0 :     setrlimit(RLIMIT_AS, &r);
     292                 :   }
     293                 : #endif
     294                 : 
     295                 : #if defined(SOLARIS)
     296                 : #define NOFILES 512
     297                 : 
     298                 :     // Boost Solaris file descriptors
     299                 :     {
     300                 :         struct rlimit rl;
     301                 :         
     302                 :         if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
     303                 : 
     304                 :             if (rl.rlim_cur < NOFILES) {
     305                 :                 rl.rlim_cur = NOFILES;
     306                 : 
     307                 :                 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
     308                 :                     perror("setrlimit(RLIMIT_NOFILE)");
     309                 :                     fprintf(stderr, "Cannot exceed hard limit for open files");
     310                 :                 }
     311                 : #if defined(DEBUG)
     312                 :                 if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
     313                 :                     printf("File descriptors set to %d\n", rl.rlim_cur);
     314                 : #endif //DEBUG
     315                 :             }
     316                 :     }
     317                 : #endif //SOLARIS
     318                 : 
     319                 : #if defined(MOZ_WIDGET_GTK2) && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
     320              24 :   const char *assertString = PR_GetEnv("XPCOM_DEBUG_BREAK");
     321              78 :   if (assertString &&
     322              24 :       (!strcmp(assertString, "suspend") ||
     323              24 :        !strcmp(assertString, "stack") ||
     324               2 :        !strcmp(assertString, "abort") ||
     325               2 :        !strcmp(assertString, "trap") ||
     326               2 :        !strcmp(assertString, "break"))) {
     327                 :     // Override the default glib logging function so we get stacks for it too.
     328              22 :     orig_log_func = g_log_set_default_handler(my_glib_log_func, NULL);
     329                 :   }
     330                 : #endif
     331              24 : }
     332                 : 
     333                 : #elif XP_WIN
     334                 : 
     335                 : #include <windows.h>
     336                 : 
     337                 : #ifdef _M_IX86
     338                 : /*
     339                 :  * WinNT.h prior to SDK7 does not expose the structure of the ExtendedRegisters for ia86.
     340                 :  * We known that MxCsr is at offset 0x18 and is a DWORD.
     341                 :  */
     342                 : #define MXCSR(ctx) (*(DWORD *)(((BYTE *)(ctx)->ExtendedRegisters) + 0x18))
     343                 : #endif
     344                 : 
     345                 : #ifdef _M_X64
     346                 : #define MXCSR(ctx) (ctx)->MxCsr
     347                 : #endif
     348                 : 
     349                 : #if defined(_M_IX86) || defined(_M_X64)
     350                 : 
     351                 : #ifdef _M_X64
     352                 : #define X87CW(ctx) (ctx)->FltSave.ControlWord
     353                 : #define X87SW(ctx) (ctx)->FltSave.StatusWord
     354                 : #else
     355                 : #define X87CW(ctx) (ctx)->FloatSave.ControlWord
     356                 : #define X87SW(ctx) (ctx)->FloatSave.StatusWord
     357                 : #endif
     358                 : 
     359                 : /*
     360                 :  * SSE traps raise these exception codes, which are defined in internal NT headers
     361                 :  * but not winbase.h
     362                 :  */
     363                 : #define STATUS_FLOAT_MULTIPLE_FAULTS 0xC00002B4
     364                 : #define STATUS_FLOAT_MULTIPLE_TRAPS  0xC00002B5
     365                 : 
     366                 : static LPTOP_LEVEL_EXCEPTION_FILTER gFPEPreviousFilter;
     367                 : 
     368                 : LONG __stdcall FpeHandler(PEXCEPTION_POINTERS pe)
     369                 : {
     370                 :   PEXCEPTION_RECORD e = (PEXCEPTION_RECORD)pe->ExceptionRecord;
     371                 :   CONTEXT *c = (CONTEXT*)pe->ContextRecord;
     372                 : 
     373                 :   switch (e->ExceptionCode) {
     374                 :     case STATUS_FLOAT_DENORMAL_OPERAND:
     375                 :     case STATUS_FLOAT_DIVIDE_BY_ZERO:
     376                 :     case STATUS_FLOAT_INEXACT_RESULT:
     377                 :     case STATUS_FLOAT_INVALID_OPERATION:
     378                 :     case STATUS_FLOAT_OVERFLOW:
     379                 :     case STATUS_FLOAT_STACK_CHECK:
     380                 :     case STATUS_FLOAT_UNDERFLOW:
     381                 :     case STATUS_FLOAT_MULTIPLE_FAULTS:
     382                 :     case STATUS_FLOAT_MULTIPLE_TRAPS:
     383                 :       X87CW(c) |= FPU_EXCEPTION_MASK; /* disable all FPU exceptions */
     384                 :       X87SW(c) &= ~FPU_STATUS_FLAGS;  /* clear all pending FPU exceptions */
     385                 : #ifdef _M_IX86
     386                 :       if (c->ContextFlags & CONTEXT_EXTENDED_REGISTERS) {
     387                 : #endif
     388                 :         MXCSR(c) |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
     389                 :         MXCSR(c) &= ~SSE_STATUS_FLAGS;  /* clear all pending SSE exceptions */
     390                 : #ifdef _M_IX86
     391                 :       }
     392                 : #endif
     393                 :       return EXCEPTION_CONTINUE_EXECUTION;
     394                 :   }
     395                 :   LONG action = EXCEPTION_CONTINUE_SEARCH;
     396                 :   if (gFPEPreviousFilter)
     397                 :     action = gFPEPreviousFilter(pe);
     398                 : 
     399                 :   return action;
     400                 : }
     401                 : 
     402                 : void InstallSignalHandlers(const char *ProgramName)
     403                 : {
     404                 :   gFPEPreviousFilter = SetUnhandledExceptionFilter(FpeHandler);
     405                 : }
     406                 : 
     407                 : #else
     408                 : 
     409                 : void InstallSignalHandlers(const char *ProgramName)
     410                 : {
     411                 : }
     412                 : 
     413                 : #endif
     414                 : 
     415                 : #elif defined(XP_OS2)
     416                 : /* OS/2's FPE handler is implemented in NSPR */
     417                 : 
     418                 : #else
     419                 : #error No signal handling implementation for this platform.
     420                 : #endif

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