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/*-
* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2006-2022 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
* Author: Guillaume Quintard <guillaume@varnish-software.com>
* Author: Dridi Boukelmoune <dridi.boukelmoune@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* We tend to print back-traces when there is a fatal error, so the VBT code
* should avoid assertions.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef WITH_UNWIND
# include <libunwind.h>
#endif
#ifdef HAVE_EXECINFO_H
# include <execinfo.h>
#endif
#include "vdef.h"
#include "vas.h"
#include "vbt.h"
#include "vsb.h"
#include "miniobj.h"
#ifdef WITH_UNWIND
static int
vbt_unwind(struct vsb *vsb)
{
unw_cursor_t cursor; unw_context_t uc;
unw_word_t ip, sp;
unw_word_t offp;
char fname[1024];
const char *sep;
int ret;
ret = unw_getcontext(&uc);
if (ret != 0) {
VSB_printf(vsb, "Backtrace not available "
"(unw_getcontext returned %d)\n", ret);
return (-1);
}
ret = unw_init_local(&cursor, &uc);
if (ret != 0) {
VSB_printf(vsb, "Backtrace not available "
"(unw_init_local returned %d)\n", ret);
return (-1);
}
while (unw_step(&cursor) > 0) {
fname[0] = '\0';
sep = "";
if (!unw_get_reg(&cursor, UNW_REG_IP, &ip)) {
VSB_printf(vsb, "ip=0x%lx", (long) ip);
sep = " ";
}
if (!unw_get_reg(&cursor, UNW_REG_SP, &sp)) {
VSB_printf(vsb, "%ssp=0x%lx", sep, (long) sp);
sep = " ";
}
if (!unw_get_proc_name(&cursor, fname, sizeof(fname), &offp)) {
VSB_printf(vsb, "%s<%s+0x%lx>",
sep, fname[0] ? fname : "<unknown>", (long)offp);
}
VSB_putc(vsb, '\n');
}
return (0);
}
#endif
#ifdef HAVE_EXECINFO_H
# define BACKTRACE_LEVELS 20
static void
vbt_execinfo(struct vsb *vsb)
{
void *array[BACKTRACE_LEVELS];
size_t size;
size_t i;
char **strings;
char *p;
char buf[32];
size = backtrace (array, BACKTRACE_LEVELS);
if (size > BACKTRACE_LEVELS) {
VSB_printf(vsb, "Backtrace not available (ret=%zu)\n", size);
return;
}
for (i = 0; i < size; i++) {
bprintf(buf, "%p", array[i]);
VSB_printf(vsb, "%s: ", buf);
strings = backtrace_symbols(&array[i], 1);
if (strings == NULL || strings[0] == NULL) {
VSB_cat(vsb, "(?)");
} else {
p = strings[0];
if (!memcmp(buf, p, strlen(buf))) {
p += strlen(buf);
if (*p == ':')
p++;
while (*p == ' ')
p++;
}
VSB_cat(vsb, p);
}
VSB_cat(vsb, "\n");
free(strings);
}
}
#endif
void
VBT_format(struct vsb *vsb)
{
if (!VALID_OBJ(vsb, VSB_MAGIC))
return;
#ifdef WITH_UNWIND
if (!vbt_unwind(vsb))
return;
# ifdef HAVE_EXECINFO_H
VSB_cat(vsb, "Falling back to execinfo backtrace\n");
# endif
#endif
#ifdef HAVE_EXECINFO_H
vbt_execinfo(vsb);
#endif
}
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