mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 20:47:44 +00:00
396 lines
11 KiB
C++
396 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* This module is supposed to abstract signal handling away from the other
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* platforms that do not support it.
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*/
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#include "nsSigHandlers.h"
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#ifdef XP_UNIX
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include "prthread.h"
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#include "plstr.h"
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#include "prenv.h"
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#include "nsDebug.h"
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#include "nsXULAppAPI.h"
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#if defined(LINUX)
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <stdlib.h> // atoi
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#ifndef ANDROID // no Android impl
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# include <ucontext.h>
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#endif
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#endif
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#if defined(SOLARIS)
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#include <sys/resource.h>
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#include <ucontext.h>
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#endif
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static char _progname[1024] = "huh?";
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static unsigned int _gdb_sleep_duration = 300;
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#if defined(LINUX) && defined(DEBUG) && \
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(defined(__i386) || defined(__x86_64) || defined(PPC))
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#define CRAWL_STACK_ON_SIGSEGV
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#endif
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#if defined(CRAWL_STACK_ON_SIGSEGV)
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#include <unistd.h>
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#include "nsISupportsUtils.h"
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#include "nsStackWalk.h"
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// NB: keep me up to date with the same variable in
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// ipc/chromium/chrome/common/ipc_channel_posix.cc
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static const int kClientChannelFd = 3;
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extern "C" {
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static void PrintStackFrame(uint32_t aFrameNumber, void *aPC, void *aSP,
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void *aClosure)
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{
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char buf[1024];
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nsCodeAddressDetails details;
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NS_DescribeCodeAddress(aPC, &details);
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NS_FormatCodeAddressDetails(buf, sizeof(buf), aFrameNumber, aPC, &details);
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fprintf(stdout, "%s\n", buf);
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fflush(stdout);
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}
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}
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void
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ah_crap_handler(int signum)
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{
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printf("\nProgram %s (pid = %d) received signal %d.\n",
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_progname,
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getpid(),
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signum);
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printf("Stack:\n");
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NS_StackWalk(PrintStackFrame, /* skipFrames */ 2, /* maxFrames */ 0,
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nullptr, 0, nullptr);
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printf("Sleeping for %d seconds.\n",_gdb_sleep_duration);
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printf("Type 'gdb %s %d' to attach your debugger to this thread.\n",
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_progname,
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getpid());
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sleep(_gdb_sleep_duration);
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printf("Done sleeping...\n");
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_exit(signum);
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}
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void
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child_ah_crap_handler(int signum)
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{
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if (!getenv("MOZ_DONT_UNBLOCK_PARENT_ON_CHILD_CRASH"))
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close(kClientChannelFd);
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ah_crap_handler(signum);
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}
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#endif // CRAWL_STACK_ON_SIGSEGV
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#ifdef MOZ_WIDGET_GTK
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// Need this include for version test below.
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#include <glib.h>
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#endif
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#if defined(MOZ_WIDGET_GTK) && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
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static GLogFunc orig_log_func = nullptr;
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extern "C" {
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static void
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my_glib_log_func(const gchar *log_domain, GLogLevelFlags log_level,
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const gchar *message, gpointer user_data);
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}
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/* static */ void
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my_glib_log_func(const gchar *log_domain, GLogLevelFlags log_level,
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const gchar *message, gpointer user_data)
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{
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if (log_level & (G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION)) {
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NS_DebugBreak(NS_DEBUG_ASSERTION, message, "glib assertion", __FILE__, __LINE__);
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} else if (log_level & (G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING)) {
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NS_DebugBreak(NS_DEBUG_WARNING, message, "glib warning", __FILE__, __LINE__);
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}
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orig_log_func(log_domain, log_level, message, nullptr);
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}
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#endif
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#ifdef SA_SIGINFO
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static void fpehandler(int signum, siginfo_t *si, void *context)
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{
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/* Integer divide by zero or integer overflow. */
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/* Note: FPE_INTOVF is ignored on Intel, PowerPC and SPARC systems. */
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if (si->si_code == FPE_INTDIV || si->si_code == FPE_INTOVF) {
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NS_DebugBreak(NS_DEBUG_ABORT, "Divide by zero", nullptr, __FILE__, __LINE__);
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}
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#ifdef XP_MACOSX
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ucontext_t *uc = (ucontext_t *)context;
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#if defined(__i386__) || defined(__amd64__)
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_STRUCT_FP_CONTROL *ctrl = &uc->uc_mcontext->__fs.__fpu_fcw;
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ctrl->__invalid = ctrl->__denorm = ctrl->__zdiv = ctrl->__ovrfl = ctrl->__undfl = ctrl->__precis = 1;
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_STRUCT_FP_STATUS *status = &uc->uc_mcontext->__fs.__fpu_fsw;
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status->__invalid = status->__denorm = status->__zdiv = status->__ovrfl = status->__undfl =
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status->__precis = status->__stkflt = status->__errsumm = 0;
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__uint32_t *mxcsr = &uc->uc_mcontext->__fs.__fpu_mxcsr;
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*mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
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*mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
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#endif
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#endif
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#if defined(LINUX) && !defined(ANDROID)
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ucontext_t *uc = (ucontext_t *)context;
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#if defined(__i386__)
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/*
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* It seems that we have no access to mxcsr on Linux. libc
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* seems to be translating cw/sw to mxcsr.
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*/
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unsigned long int *cw = &uc->uc_mcontext.fpregs->cw;
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*cw |= FPU_EXCEPTION_MASK;
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unsigned long int *sw = &uc->uc_mcontext.fpregs->sw;
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*sw &= ~FPU_STATUS_FLAGS;
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#endif
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#if defined(__amd64__)
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__uint16_t *cw = &uc->uc_mcontext.fpregs->cwd;
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*cw |= FPU_EXCEPTION_MASK;
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__uint16_t *sw = &uc->uc_mcontext.fpregs->swd;
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*sw &= ~FPU_STATUS_FLAGS;
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__uint32_t *mxcsr = &uc->uc_mcontext.fpregs->mxcsr;
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*mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
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*mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
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#endif
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#endif
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#ifdef SOLARIS
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ucontext_t *uc = (ucontext_t *)context;
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#if defined(__i386)
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uint32_t *cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[0];
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*cw |= FPU_EXCEPTION_MASK;
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uint32_t *sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[1];
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*sw &= ~FPU_STATUS_FLAGS;
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/* address of the instruction that caused the exception */
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uint32_t *ip = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[3];
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uc->uc_mcontext.gregs[REG_PC] = *ip;
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#endif
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#if defined(__amd64__)
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uint16_t *cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.cw;
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*cw |= FPU_EXCEPTION_MASK;
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uint16_t *sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.sw;
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*sw &= ~FPU_STATUS_FLAGS;
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uint32_t *mxcsr = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.mxcsr;
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*mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
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*mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
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#endif
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#endif
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}
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#endif
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void InstallSignalHandlers(const char *ProgramName)
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{
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PL_strncpy(_progname,ProgramName, (sizeof(_progname)-1) );
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const char *gdbSleep = PR_GetEnv("MOZ_GDB_SLEEP");
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if (gdbSleep && *gdbSleep)
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{
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unsigned int s;
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if (1 == sscanf(gdbSleep, "%u", &s)) {
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_gdb_sleep_duration = s;
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}
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}
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#if defined(CRAWL_STACK_ON_SIGSEGV)
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if (!getenv("XRE_NO_WINDOWS_CRASH_DIALOG")) {
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void (*crap_handler)(int) =
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GeckoProcessType_Default != XRE_GetProcessType() ?
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child_ah_crap_handler :
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ah_crap_handler;
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signal(SIGSEGV, crap_handler);
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signal(SIGILL, crap_handler);
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signal(SIGABRT, crap_handler);
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}
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#endif // CRAWL_STACK_ON_SIGSEGV
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#ifdef SA_SIGINFO
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/* Install a handler for floating point exceptions and disable them if they occur. */
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struct sigaction sa, osa;
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sa.sa_flags = SA_ONSTACK | SA_RESTART | SA_SIGINFO;
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sa.sa_sigaction = fpehandler;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGFPE, &sa, &osa);
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#endif
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if (XRE_GetProcessType() == GeckoProcessType_Content) {
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/*
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* If the user is debugging a Gecko parent process in gdb and hits ^C to
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* suspend, a SIGINT signal will be sent to the child. We ignore this signal
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* so the child isn't killed.
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*/
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signal(SIGINT, SIG_IGN);
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}
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#if defined(DEBUG) && defined(LINUX)
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const char *memLimit = PR_GetEnv("MOZ_MEM_LIMIT");
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if (memLimit && *memLimit)
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{
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long m = atoi(memLimit);
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m *= (1024*1024);
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struct rlimit r;
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r.rlim_cur = m;
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r.rlim_max = m;
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setrlimit(RLIMIT_AS, &r);
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}
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#endif
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#if defined(SOLARIS)
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#define NOFILES 512
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// Boost Solaris file descriptors
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{
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struct rlimit rl;
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if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
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if (rl.rlim_cur < NOFILES) {
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rl.rlim_cur = NOFILES;
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if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
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perror("setrlimit(RLIMIT_NOFILE)");
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fprintf(stderr, "Cannot exceed hard limit for open files");
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}
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#if defined(DEBUG)
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if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
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printf("File descriptors set to %d\n", rl.rlim_cur);
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#endif //DEBUG
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}
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}
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#endif //SOLARIS
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#if defined(MOZ_WIDGET_GTK) && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
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const char *assertString = PR_GetEnv("XPCOM_DEBUG_BREAK");
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if (assertString &&
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(!strcmp(assertString, "suspend") ||
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!strcmp(assertString, "stack") ||
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!strcmp(assertString, "abort") ||
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!strcmp(assertString, "trap") ||
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!strcmp(assertString, "break"))) {
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// Override the default glib logging function so we get stacks for it too.
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orig_log_func = g_log_set_default_handler(my_glib_log_func, nullptr);
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}
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#endif
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}
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#elif XP_WIN
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#include <windows.h>
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#ifdef _M_IX86
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/*
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* WinNT.h prior to SDK7 does not expose the structure of the ExtendedRegisters for ia86.
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* We known that MxCsr is at offset 0x18 and is a DWORD.
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*/
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#define MXCSR(ctx) (*(DWORD *)(((BYTE *)(ctx)->ExtendedRegisters) + 0x18))
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#endif
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#ifdef _M_X64
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#define MXCSR(ctx) (ctx)->MxCsr
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#endif
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#if defined(_M_IX86) || defined(_M_X64)
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#ifdef _M_X64
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#define X87CW(ctx) (ctx)->FltSave.ControlWord
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#define X87SW(ctx) (ctx)->FltSave.StatusWord
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#else
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#define X87CW(ctx) (ctx)->FloatSave.ControlWord
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#define X87SW(ctx) (ctx)->FloatSave.StatusWord
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#endif
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/*
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* SSE traps raise these exception codes, which are defined in internal NT headers
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* but not winbase.h
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*/
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#define STATUS_FLOAT_MULTIPLE_FAULTS 0xC00002B4
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#define STATUS_FLOAT_MULTIPLE_TRAPS 0xC00002B5
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static LPTOP_LEVEL_EXCEPTION_FILTER gFPEPreviousFilter;
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LONG __stdcall FpeHandler(PEXCEPTION_POINTERS pe)
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{
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PEXCEPTION_RECORD e = (PEXCEPTION_RECORD)pe->ExceptionRecord;
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CONTEXT *c = (CONTEXT*)pe->ContextRecord;
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switch (e->ExceptionCode) {
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case STATUS_FLOAT_DENORMAL_OPERAND:
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case STATUS_FLOAT_DIVIDE_BY_ZERO:
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case STATUS_FLOAT_INEXACT_RESULT:
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case STATUS_FLOAT_INVALID_OPERATION:
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case STATUS_FLOAT_OVERFLOW:
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case STATUS_FLOAT_STACK_CHECK:
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case STATUS_FLOAT_UNDERFLOW:
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case STATUS_FLOAT_MULTIPLE_FAULTS:
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case STATUS_FLOAT_MULTIPLE_TRAPS:
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X87CW(c) |= FPU_EXCEPTION_MASK; /* disable all FPU exceptions */
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X87SW(c) &= ~FPU_STATUS_FLAGS; /* clear all pending FPU exceptions */
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#ifdef _M_IX86
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if (c->ContextFlags & CONTEXT_EXTENDED_REGISTERS) {
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#endif
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MXCSR(c) |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
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MXCSR(c) &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
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#ifdef _M_IX86
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}
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#endif
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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LONG action = EXCEPTION_CONTINUE_SEARCH;
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if (gFPEPreviousFilter)
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action = gFPEPreviousFilter(pe);
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return action;
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}
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void InstallSignalHandlers(const char *ProgramName)
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{
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gFPEPreviousFilter = SetUnhandledExceptionFilter(FpeHandler);
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}
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#else
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void InstallSignalHandlers(const char *ProgramName)
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{
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}
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#endif
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#else
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#error No signal handling implementation for this platform.
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#endif
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