mirror of
https://github.com/tobast/libunwind-eh_elf.git
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193 lines
4.7 KiB
C
193 lines
4.7 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/* Check whether basic unwinding truly is async-signal safe. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "compiler.h"
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/time.h>
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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static const int nerrors_max = 100;
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struct itimerval interval =
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{
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.it_interval = { .tv_sec = 0, .tv_usec = 0 },
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.it_value = { .tv_sec = 0, .tv_usec = 1000 }
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};
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int verbose;
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int nerrors;
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int sigcount;
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#ifndef CONFIG_BLOCK_SIGNALS
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/* When libunwind is configured with --enable-block-signals=no, the caller
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is responsible for preventing recursion via signal handlers.
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We use a simple global here. In a multithreaded program, one would use
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a thread-local variable. */
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int recurcount;
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#endif
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#define panic(args...) \
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{ ++nerrors; fprintf (stderr, args); return; }
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static void
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do_backtrace (int may_print, int get_proc_name)
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{
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char buf[512], name[256];
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unw_cursor_t cursor;
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unw_word_t ip, sp, off;
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unw_context_t uc;
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int ret;
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int depth = 0;
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#ifndef CONFIG_BLOCK_SIGNALS
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if (recurcount > 0)
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return;
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recurcount += 1;
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#endif
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unw_getcontext (&uc);
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if (unw_init_local (&cursor, &uc) < 0)
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panic ("unw_init_local failed!\n");
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do
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{
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unw_get_reg (&cursor, UNW_REG_IP, &ip);
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unw_get_reg (&cursor, UNW_REG_SP, &sp);
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buf[0] = '\0';
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if (get_proc_name || (may_print && verbose))
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{
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ret = unw_get_proc_name (&cursor, name, sizeof (name), &off);
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if (ret == 0 && (may_print && verbose))
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{
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if (off)
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snprintf (buf, sizeof (buf), "<%s+0x%lx>", name, (long) off);
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else
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{
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size_t len = strlen (name);
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buf[0] = '<';
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memcpy (buf + 1, name, len);
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buf[len + 1] = '>';
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buf[len + 2] = '\0';
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}
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}
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}
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if (may_print && verbose)
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printf ("%016lx %-32s (sp=%016lx)\n", (long) ip, buf, (long) sp);
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ret = unw_step (&cursor);
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if (ret < 0)
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{
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unw_get_reg (&cursor, UNW_REG_IP, &ip);
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panic ("FAILURE: unw_step() returned %d for ip=%lx\n",
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ret, (long) ip);
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}
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if (depth++ > 100)
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{
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panic ("FAILURE: unw_step() looping over %d iterations\n", depth);
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break;
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}
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}
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while (ret > 0);
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#ifndef CONFIG_BLOCK_SIGNALS
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recurcount -= 1;
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#endif
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}
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void
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sighandler (int signal)
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{
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if (verbose)
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printf ("sighandler(signal=%d, count=%d)\n", signal, sigcount);
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do_backtrace (1, 1);
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++sigcount;
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if (sigcount == 100)
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unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_GLOBAL);
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else if (sigcount == 200)
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unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
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else if (sigcount == 300 || nerrors > nerrors_max)
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{
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if (nerrors > nerrors_max)
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panic ("Too many errors (%d)\n", nerrors);
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if (nerrors)
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{
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fprintf (stderr, "FAILURE: detected %d errors\n", nerrors);
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exit (-1);
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}
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if (verbose)
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printf ("SUCCESS.\n");
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exit (0);
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}
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setitimer (ITIMER_VIRTUAL, &interval, NULL);
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}
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int
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main (int argc, char **argv UNUSED)
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{
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struct sigaction act;
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long i = 0;
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if (argc > 1)
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verbose = 1;
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unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_NONE);
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memset (&act, 0, sizeof (act));
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act.sa_handler = sighandler;
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act.sa_flags = SA_SIGINFO;
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sigaction (SIGVTALRM, &act, NULL);
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setitimer (ITIMER_VIRTUAL, &interval, NULL);
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while (1)
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{
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if (0 && verbose)
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printf ("%s: starting backtrace\n", __FUNCTION__);
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do_backtrace (0, (i++ % 100) == 0);
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if (nerrors > nerrors_max)
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{
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fprintf (stderr, "Too many errors (%d)\n", nerrors);
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exit (-1);
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}
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}
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return (0);
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}
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