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sim: Add support for generating back traces on errors

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Add functionality to generate a back trace if gem5 crashes (SIGABRT or
SIGSEGV). The current implementation uses glibc's stack traversal
support if available and stubs out the call to print_backtrace()
otherwise.
This commit is contained in:
Andreas Sandberg 2015-12-04 00:12:58 +00:00
parent a1aeff27ce
commit daa53da594
7 changed files with 286 additions and 19 deletions
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17
SConstruct
View file

@ -983,6 +983,21 @@ if not GetOption('without_tcmalloc'):
"installing tcmalloc (libgoogle-perftools-dev package "\
"on Ubuntu or RedHat)." + termcap.Normal
# Detect back trace implementations. The last implementation in the
# list will be used by default.
backtrace_impls = [ "none" ]
if conf.CheckLibWithHeader(None, 'execinfo.h', 'C',
'backtrace_symbols_fd((void*)0, 0, 0);'):
backtrace_impls.append("glibc")
if backtrace_impls[-1] == "none":
default_backtrace_impl = "none"
print termcap.Yellow + termcap.Bold + \
"No suitable back trace implementation found." + \
termcap.Normal
if not have_posix_clock:
print "Can't find library for POSIX clocks."
@ -1131,6 +1146,8 @@ sticky_vars.AddVariables(
BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm),
EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
all_protocols),
EnumVariable('BACKTRACE_IMPL', 'Post-mortem dump implementation',
backtrace_impls[-1], backtrace_impls)
)
# These variables get exported to #defines in config/*.hh (see src/SConscript).

24
src/base/atomicio.hh
View file

@ -41,4 +41,28 @@
ssize_t atomic_read(int fd, void *s, size_t n);
ssize_t atomic_write(int fd, const void *s, size_t n);
/**
* Statically allocate a string and write it to a file descriptor.
*
* @warning The return value will from atomic_write will be ignored
* which means that errors will be ignored. This is normally fine as
* this macro is intended to be used in fatal signal handlers where
* error handling might not be feasible.
*/
#define STATIC_MSG(fd, m) \
do { \
static const char msg[] = m; \
atomic_write(fd, msg, sizeof(msg) - 1); \
} while(0)
/**
* Statically allocate a string and write it to STDERR.
*
* @warning The return value will from atomic_write will be ignored
* which means that errors will be ignored. This is normally fine as
* this macro is intended to be used in fatal signal handlers where
* error handling might not be feasible.
*/
#define STATIC_ERR(m) STATIC_MSG(STDERR_FILENO, m)
#endif // __BASE_ATOMICIO_HH__

1
src/sim/SConscript
View file

@ -41,6 +41,7 @@ SimObject('SubSystem.py')
Source('arguments.cc')
Source('async.cc')
Source('backtrace_%s.cc' % env['BACKTRACE_IMPL'])
Source('core.cc')
Source('tags.cc')
Source('cxx_config.cc')

50
src/sim/backtrace.hh Normal file
View file

@ -0,0 +1,50 @@
/*
* Copyright (c) 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
*/
#ifndef __SIM_BACKTRACE_HH__
#define __SIM_BACKTRACE_HH__
/**
* Print a gem5 post-mortem report
*
* @note This is usually called from a signal handler. Implementations
* must support this use case.
*/
void print_backtrace();
#endif // __SIM_BACKTRACE_HH__

66
src/sim/backtrace_glibc.cc Normal file
View file

@ -0,0 +1,66 @@
/*
* Copyright (c) 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
*/
#include "sim/backtrace.hh"
#include <execinfo.h>
#include <unistd.h>
#include "base/atomicio.hh"
#define SAFE_MSG(m) \
do { \
static const char msg[] = m; \
atomic_write(STDERR_FILENO, msg, sizeof(msg) - 1); \
} while(0)
void
print_backtrace()
{
void *buffer[32];
int size;
size = backtrace(buffer, sizeof(buffer) / sizeof(*buffer));
STATIC_ERR("--- BEGIN LIBC BACKTRACE ---\n");
backtrace_symbols_fd(buffer, size, STDERR_FILENO);
if (size == sizeof(buffer))
STATIC_ERR("Warning: Backtrace may have been truncated.\n");
STATIC_ERR("--- END LIBC BACKTRACE ---\n");
}

45
src/sim/backtrace_none.cc Normal file
View file

@ -0,0 +1,45 @@
/*
* Copyright (c) 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
*/
#include "sim/backtrace.hh"
void
print_backtrace()
{
}

102
src/sim/init_signals.cc
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2012 ARM Limited
* Copyright (c) 2012, 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@ -41,18 +41,67 @@
* Authors: Nathan Binkert
*/
#include "sim/init_signals.hh"
#include <sys/types.h>
#include <unistd.h>
#include <csignal>
#include <iostream>
#include <string>
#include "base/atomicio.hh"
#include "base/cprintf.hh"
#include "sim/async.hh"
#include "sim/backtrace.hh"
#include "sim/core.hh"
#include "sim/eventq.hh"
#include "sim/init_signals.hh"
using namespace std;
// Use an separate stack for fatal signal handlers
static uint8_t fatalSigStack[2 * SIGSTKSZ];
static bool
setupAltStack()
{
stack_t stack;
stack.ss_sp = fatalSigStack;
stack.ss_size = sizeof(fatalSigStack);
stack.ss_flags = 0;
return sigaltstack(&stack, NULL) == 0;
}
static void
installSignalHandler(int signal, void (*handler)(int sigtype),
int flags = SA_RESTART)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = handler;
sa.sa_flags = flags;
if (sigaction(signal, &sa, NULL) == -1)
panic("Failed to setup handler for signal %i\n", signal);
}
static void
raiseFatalSignal(int signo)
{
// The signal handler should have been reset and unmasked (it was
// registered with SA_RESETHAND | SA_NODEFER), just raise the
// signal again to invoke the default handler.
pthread_kill(pthread_self(), signo);
// Something is really wrong if the process is alive at this
// point, manually try to exit it.
STATIC_ERR("Failed to execute default signal handler!\n");
_exit(127);
}
/// Stats signal handler.
void
dumpStatsHandler(int sigtype)
@ -87,7 +136,25 @@ exitNowHandler(int sigtype)
void
abortHandler(int sigtype)
{
ccprintf(cerr, "Program aborted at tick %llu\n", curTick());
const EventQueue *const eq(curEventQueue());
if (eq) {
ccprintf(cerr, "Program aborted at tick %llu\n", eq->getCurTick());
} else {
STATIC_ERR("Program aborted\n\n");
}
print_backtrace();
raiseFatalSignal(sigtype);
}
/// Segmentation fault signal handler.
static void
segvHandler(int sigtype)
{
STATIC_ERR("gem5 has encountered a segmentation fault!\n\n");
print_backtrace();
raiseFatalSignal(SIGSEGV);
}
// Handle SIGIO
@ -100,20 +167,6 @@ ioHandler(int sigtype)
getEventQueue(0)->wakeup();
}
static void
installSignalHandler(int signal, void (*handler)(int sigtype))
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = handler;
sa.sa_flags = SA_RESTART;
if (sigaction(signal, &sa, NULL) == -1)
panic("Failed to setup handler for signal %i\n", signal);
}
/*
* M5 can do several special things when various signals are sent.
* None are mandatory.
@ -137,8 +190,19 @@ initSignals()
// Exit cleanly on Interrupt (Ctrl-C)
installSignalHandler(SIGINT, exitNowHandler);
// Print out cycle number on abort
installSignalHandler(SIGABRT, abortHandler);
// Print the current cycle number and a backtrace on abort. Make
// sure the signal is unmasked and the handler reset when a signal
// is delivered to be able to invoke the default handler.
installSignalHandler(SIGABRT, abortHandler, SA_RESETHAND | SA_NODEFER);
// Setup a SIGSEGV handler with a private stack
if (setupAltStack()) {
installSignalHandler(SIGSEGV, segvHandler,
SA_RESETHAND | SA_NODEFER | SA_ONSTACK);
} else {
warn("Failed to setup stack for SIGSEGV handler, "
"using default signal handler.\n");
}
// Install a SIGIO handler to handle asynchronous file IO. See the
// PollQueue class.