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/* Copyright 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <execinfo.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include "host_task.h"
#include "host_test.h"
#include "timer.h"
#define SIGNAL_TRACE_DUMP SIGTERM
#define MAX_TRACE 30
/*
* When trace dump is requested from signal handler, skip:
* _task_dump_trace_impl
* _task_dump_trace_dispath
* A function in libc
*/
#define SIGNAL_TRACE_OFFSET 3
/*
* When trace dump is requested from task_dump_trace(), skip:
* task_dump_trace
* _task_dump_trace_impl
*/
#define DIRECT_TRACE_OFFSET 2
static pthread_t main_thread;
static void __attribute__((noinline)) _task_dump_trace_impl(int offset)
{
void *trace[MAX_TRACE];
size_t sz;
char **messages;
char buf[256];
FILE *file;
int i, nb;
sz = backtrace(trace, MAX_TRACE);
messages = backtrace_symbols(trace + offset, sz - offset);
for (i = 0; i < sz - offset; ++i) {
fprintf(stderr, "#%-2d %s\n", i, messages[i]);
/* %p is correct (as opposed to %pP) since this is the host */
sprintf(buf, "addr2line %p -e %s",
trace[i + offset], __get_prog_name());
file = popen(buf, "r");
if (file) {
nb = fread(buf, 1, sizeof(buf) - 1, file);
buf[nb] = '\0';
fprintf(stderr, " %s", buf);
pclose(file);
}
}
fflush(stderr);
free(messages);
}
void __attribute__((noinline)) task_dump_trace(void)
{
_task_dump_trace_impl(DIRECT_TRACE_OFFSET);
}
static void __attribute__((noinline)) _task_dump_trace_dispatch(int sig)
{
int need_dispatch = 1;
task_id_t running = task_get_running();
if (!pthread_equal(pthread_self(), main_thread)) {
need_dispatch = 0;
} else if (!task_start_called()) {
fprintf(stderr, "Stack trace of main thread:\n");
need_dispatch = 0;
} else if (in_interrupt_context()) {
fprintf(stderr, "Stack trace of ISR:\n");
} else {
fprintf(stderr, "Stack trace of task %d (%s):\n",
running, task_get_name(running));
}
if (need_dispatch) {
pthread_kill(task_get_thread(running), SIGNAL_TRACE_DUMP);
} else {
_task_dump_trace_impl(SIGNAL_TRACE_OFFSET);
exit(1);
}
}
void task_register_tracedump(void)
{
/* Trace dumper MUST be registered from main thread */
main_thread = pthread_self();
signal(SIGNAL_TRACE_DUMP, _task_dump_trace_dispatch);
}
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