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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /toolkit/xre/nsSigHandlers.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'toolkit/xre/nsSigHandlers.cpp')
-rw-r--r--toolkit/xre/nsSigHandlers.cpp404
1 files changed, 404 insertions, 0 deletions
diff --git a/toolkit/xre/nsSigHandlers.cpp b/toolkit/xre/nsSigHandlers.cpp
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+++ b/toolkit/xre/nsSigHandlers.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This module is supposed to abstract signal handling away from the other
+ * platforms that do not support it.
+ */
+
+#include "nsSigHandlers.h"
+
+#ifdef XP_UNIX
+
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include "prthread.h"
+#include "plstr.h"
+#include "prenv.h"
+#include "nsDebug.h"
+#include "nsXULAppAPI.h"
+
+#if defined(LINUX)
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <unistd.h>
+#include <stdlib.h> // atoi
+#include <sys/prctl.h>
+#ifndef ANDROID // no Android impl
+# include <ucontext.h>
+#endif
+#endif
+
+#if defined(SOLARIS)
+#include <sys/resource.h>
+#include <ucontext.h>
+#endif
+
+static const char* gProgname = "huh?";
+
+// Note: some tests manipulate this value.
+unsigned int _gdb_sleep_duration = 300;
+
+#if defined(LINUX) && defined(DEBUG) && \
+ (defined(__i386) || defined(__x86_64) || defined(PPC))
+#define CRAWL_STACK_ON_SIGSEGV
+#endif
+
+#ifndef PR_SET_PTRACER
+#define PR_SET_PTRACER 0x59616d61
+#endif
+#ifndef PR_SET_PTRACER_ANY
+#define PR_SET_PTRACER_ANY ((unsigned long)-1)
+#endif
+
+#if defined(CRAWL_STACK_ON_SIGSEGV)
+
+#include <unistd.h>
+#include "nsISupportsUtils.h"
+#include "mozilla/StackWalk.h"
+
+// NB: keep me up to date with the same variable in
+// ipc/chromium/chrome/common/ipc_channel_posix.cc
+static const int kClientChannelFd = 3;
+
+extern "C" {
+
+static void PrintStackFrame(uint32_t aFrameNumber, void *aPC, void *aSP,
+ void *aClosure)
+{
+ char buf[1024];
+ MozCodeAddressDetails details;
+
+ MozDescribeCodeAddress(aPC, &details);
+ MozFormatCodeAddressDetails(buf, sizeof(buf), aFrameNumber, aPC, &details);
+ fprintf(stdout, "%s\n", buf);
+ fflush(stdout);
+}
+
+}
+
+void
+ah_crap_handler(int signum)
+{
+ printf("\nProgram %s (pid = %d) received signal %d.\n",
+ gProgname,
+ getpid(),
+ signum);
+
+ printf("Stack:\n");
+ MozStackWalk(PrintStackFrame, /* skipFrames */ 2, /* maxFrames */ 0,
+ nullptr, 0, nullptr);
+
+ printf("Sleeping for %d seconds.\n",_gdb_sleep_duration);
+ printf("Type 'gdb %s %d' to attach your debugger to this thread.\n",
+ gProgname,
+ getpid());
+
+ // Allow us to be ptraced by gdb on Linux with Yama restrictions enabled.
+ prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY);
+
+ sleep(_gdb_sleep_duration);
+
+ printf("Done sleeping...\n");
+
+ _exit(signum);
+}
+
+void
+child_ah_crap_handler(int signum)
+{
+ if (!getenv("MOZ_DONT_UNBLOCK_PARENT_ON_CHILD_CRASH"))
+ close(kClientChannelFd);
+ ah_crap_handler(signum);
+}
+
+#endif // CRAWL_STACK_ON_SIGSEGV
+
+#ifdef MOZ_WIDGET_GTK
+// Need this include for version test below.
+#include <glib.h>
+#endif
+
+#if defined(MOZ_WIDGET_GTK) && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
+
+static GLogFunc orig_log_func = nullptr;
+
+extern "C" {
+static void
+my_glib_log_func(const gchar *log_domain, GLogLevelFlags log_level,
+ const gchar *message, gpointer user_data);
+}
+
+/* static */ void
+my_glib_log_func(const gchar *log_domain, GLogLevelFlags log_level,
+ const gchar *message, gpointer user_data)
+{
+ if (log_level & (G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION)) {
+ NS_DebugBreak(NS_DEBUG_ASSERTION, message, "glib assertion", __FILE__, __LINE__);
+ } else if (log_level & (G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING)) {
+ NS_DebugBreak(NS_DEBUG_WARNING, message, "glib warning", __FILE__, __LINE__);
+ }
+
+ orig_log_func(log_domain, log_level, message, nullptr);
+}
+
+#endif
+
+#ifdef SA_SIGINFO
+static void fpehandler(int signum, siginfo_t *si, void *context)
+{
+ /* Integer divide by zero or integer overflow. */
+ /* Note: FPE_INTOVF is ignored on Intel, PowerPC and SPARC systems. */
+ if (si->si_code == FPE_INTDIV || si->si_code == FPE_INTOVF) {
+ NS_DebugBreak(NS_DEBUG_ABORT, "Divide by zero", nullptr, __FILE__, __LINE__);
+ }
+
+#ifdef XP_MACOSX
+ ucontext_t *uc = (ucontext_t *)context;
+
+#if defined(__i386__) || defined(__amd64__)
+ _STRUCT_FP_CONTROL *ctrl = &uc->uc_mcontext->__fs.__fpu_fcw;
+ ctrl->__invalid = ctrl->__denorm = ctrl->__zdiv = ctrl->__ovrfl = ctrl->__undfl = ctrl->__precis = 1;
+
+ _STRUCT_FP_STATUS *status = &uc->uc_mcontext->__fs.__fpu_fsw;
+ status->__invalid = status->__denorm = status->__zdiv = status->__ovrfl = status->__undfl =
+ status->__precis = status->__stkflt = status->__errsumm = 0;
+
+ uint32_t *mxcsr = &uc->uc_mcontext->__fs.__fpu_mxcsr;
+ *mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
+ *mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
+#endif
+#endif
+#if defined(LINUX) && !defined(ANDROID)
+ ucontext_t *uc = (ucontext_t *)context;
+
+#if defined(__i386__)
+ /*
+ * It seems that we have no access to mxcsr on Linux. libc
+ * seems to be translating cw/sw to mxcsr.
+ */
+ unsigned long int *cw = &uc->uc_mcontext.fpregs->cw;
+ *cw |= FPU_EXCEPTION_MASK;
+
+ unsigned long int *sw = &uc->uc_mcontext.fpregs->sw;
+ *sw &= ~FPU_STATUS_FLAGS;
+#endif
+#if defined(__amd64__)
+ uint16_t *cw = &uc->uc_mcontext.fpregs->cwd;
+ *cw |= FPU_EXCEPTION_MASK;
+
+ uint16_t *sw = &uc->uc_mcontext.fpregs->swd;
+ *sw &= ~FPU_STATUS_FLAGS;
+
+ uint32_t *mxcsr = &uc->uc_mcontext.fpregs->mxcsr;
+ *mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
+ *mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
+#endif
+#endif
+#ifdef SOLARIS
+ ucontext_t *uc = (ucontext_t *)context;
+
+#if defined(__i386)
+ uint32_t *cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[0];
+ *cw |= FPU_EXCEPTION_MASK;
+
+ uint32_t *sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[1];
+ *sw &= ~FPU_STATUS_FLAGS;
+
+ /* address of the instruction that caused the exception */
+ uint32_t *ip = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[3];
+ uc->uc_mcontext.gregs[REG_PC] = *ip;
+#endif
+#if defined(__amd64__)
+ uint16_t *cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.cw;
+ *cw |= FPU_EXCEPTION_MASK;
+
+ uint16_t *sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.sw;
+ *sw &= ~FPU_STATUS_FLAGS;
+
+ uint32_t *mxcsr = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.mxcsr;
+ *mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
+ *mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
+#endif
+#endif
+}
+#endif
+
+void InstallSignalHandlers(const char *aProgname)
+{
+ const char* tmp = PL_strdup(aProgname);
+ if (tmp) {
+ gProgname = tmp;
+ }
+
+ const char *gdbSleep = PR_GetEnv("MOZ_GDB_SLEEP");
+ if (gdbSleep && *gdbSleep)
+ {
+ unsigned int s;
+ if (1 == sscanf(gdbSleep, "%u", &s)) {
+ _gdb_sleep_duration = s;
+ }
+ }
+
+#if defined(CRAWL_STACK_ON_SIGSEGV)
+ if (!getenv("XRE_NO_WINDOWS_CRASH_DIALOG")) {
+ void (*crap_handler)(int) =
+ GeckoProcessType_Default != XRE_GetProcessType() ?
+ child_ah_crap_handler :
+ ah_crap_handler;
+ signal(SIGSEGV, crap_handler);
+ signal(SIGILL, crap_handler);
+ signal(SIGABRT, crap_handler);
+ }
+#endif // CRAWL_STACK_ON_SIGSEGV
+
+#ifdef SA_SIGINFO
+ /* Install a handler for floating point exceptions and disable them if they occur. */
+ struct sigaction sa, osa;
+ sa.sa_flags = SA_ONSTACK | SA_RESTART | SA_SIGINFO;
+ sa.sa_sigaction = fpehandler;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGFPE, &sa, &osa);
+#endif
+
+ if (!XRE_IsParentProcess()) {
+ /*
+ * If the user is debugging a Gecko parent process in gdb and hits ^C to
+ * suspend, a SIGINT signal will be sent to the child. We ignore this signal
+ * so the child isn't killed.
+ */
+ signal(SIGINT, SIG_IGN);
+ }
+
+#if defined(DEBUG) && defined(LINUX)
+ const char *memLimit = PR_GetEnv("MOZ_MEM_LIMIT");
+ if (memLimit && *memLimit)
+ {
+ long m = atoi(memLimit);
+ m *= (1024*1024);
+ struct rlimit r;
+ r.rlim_cur = m;
+ r.rlim_max = m;
+ setrlimit(RLIMIT_AS, &r);
+ }
+#endif
+
+#if defined(SOLARIS)
+#define NOFILES 512
+
+ // Boost Solaris file descriptors
+ {
+ struct rlimit rl;
+
+ if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
+
+ if (rl.rlim_cur < NOFILES) {
+ rl.rlim_cur = NOFILES;
+
+ if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
+ perror("setrlimit(RLIMIT_NOFILE)");
+ fprintf(stderr, "Cannot exceed hard limit for open files");
+ }
+#if defined(DEBUG)
+ if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
+ printf("File descriptors set to %d\n", rl.rlim_cur);
+#endif //DEBUG
+ }
+ }
+#endif //SOLARIS
+
+#if defined(MOZ_WIDGET_GTK) && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
+ const char *assertString = PR_GetEnv("XPCOM_DEBUG_BREAK");
+ if (assertString &&
+ (!strcmp(assertString, "suspend") ||
+ !strcmp(assertString, "stack") ||
+ !strcmp(assertString, "abort") ||
+ !strcmp(assertString, "trap") ||
+ !strcmp(assertString, "break"))) {
+ // Override the default glib logging function so we get stacks for it too.
+ orig_log_func = g_log_set_default_handler(my_glib_log_func, nullptr);
+ }
+#endif
+}
+
+#elif XP_WIN
+
+#include <windows.h>
+
+#ifdef _M_IX86
+/*
+ * WinNT.h prior to SDK7 does not expose the structure of the ExtendedRegisters for ia86.
+ * We known that MxCsr is at offset 0x18 and is a DWORD.
+ */
+#define MXCSR(ctx) (*(DWORD *)(((BYTE *)(ctx)->ExtendedRegisters) + 0x18))
+#endif
+
+#ifdef _M_X64
+#define MXCSR(ctx) (ctx)->MxCsr
+#endif
+
+#if defined(_M_IX86) || defined(_M_X64)
+
+#ifdef _M_X64
+#define X87CW(ctx) (ctx)->FltSave.ControlWord
+#define X87SW(ctx) (ctx)->FltSave.StatusWord
+#else
+#define X87CW(ctx) (ctx)->FloatSave.ControlWord
+#define X87SW(ctx) (ctx)->FloatSave.StatusWord
+#endif
+
+static LPTOP_LEVEL_EXCEPTION_FILTER gFPEPreviousFilter;
+
+LONG __stdcall FpeHandler(PEXCEPTION_POINTERS pe)
+{
+ PEXCEPTION_RECORD e = (PEXCEPTION_RECORD)pe->ExceptionRecord;
+ CONTEXT *c = (CONTEXT*)pe->ContextRecord;
+
+ switch (e->ExceptionCode) {
+ case STATUS_FLOAT_DENORMAL_OPERAND:
+ case STATUS_FLOAT_DIVIDE_BY_ZERO:
+ case STATUS_FLOAT_INEXACT_RESULT:
+ case STATUS_FLOAT_INVALID_OPERATION:
+ case STATUS_FLOAT_OVERFLOW:
+ case STATUS_FLOAT_STACK_CHECK:
+ case STATUS_FLOAT_UNDERFLOW:
+ case STATUS_FLOAT_MULTIPLE_FAULTS:
+ case STATUS_FLOAT_MULTIPLE_TRAPS:
+ X87CW(c) |= FPU_EXCEPTION_MASK; /* disable all FPU exceptions */
+ X87SW(c) &= ~FPU_STATUS_FLAGS; /* clear all pending FPU exceptions */
+#ifdef _M_IX86
+ if (c->ContextFlags & CONTEXT_EXTENDED_REGISTERS) {
+#endif
+ MXCSR(c) |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
+ MXCSR(c) &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
+#ifdef _M_IX86
+ }
+#endif
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+ LONG action = EXCEPTION_CONTINUE_SEARCH;
+ if (gFPEPreviousFilter)
+ action = gFPEPreviousFilter(pe);
+
+ return action;
+}
+
+void InstallSignalHandlers(const char *aProgname)
+{
+ gFPEPreviousFilter = SetUnhandledExceptionFilter(FpeHandler);
+}
+
+#else
+
+void InstallSignalHandlers(const char *aProgname)
+{
+}
+
+#endif
+
+#else
+#error No signal handling implementation for this platform.
+#endif