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159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2003 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Copyright (c) 2002 Hewlett-Packard Co.
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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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#include <errno.h>
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#include <execinfo.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 <libunwind.h>
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#define panic(args...) \
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{ fprintf (stderr, args); exit (-1); }
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static void
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do_backtrace (void)
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{
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char buf[512], name[256];
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unw_word_t ip, sp, off;
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unw_cursor_t cursor;
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unw_proc_info_t pi;
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unw_context_t uc;
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int ret;
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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 (unw_get_proc_name (&cursor, name, sizeof (name), &off) == 0)
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{
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if (off)
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snprintf (buf, sizeof (buf), "<%s+0x%lx>", name, off);
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else
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snprintf (buf, sizeof (buf), "<%s>", name);
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}
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printf ("%016lx %-32s (sp=%016lx)\n", (long) ip, buf, (long) sp);
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unw_get_proc_info (&cursor, &pi);
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printf ("\tproc=%016lx-%016lx\n\thandler=%lx lsda=%lx",
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(long) pi.start_ip, (long) pi.end_ip,
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(long) pi.handler, (long) pi.lsda);
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#if UNW_TARGET_IA64
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{
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unw_word_t bsp;
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unw_get_reg (&cursor, UNW_IA64_BSP, &bsp);
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printf (" bsp=%lx", bsp);
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}
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#endif
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printf ("\n");
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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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printf ("FAILURE: unw_step() returned %d for ip=%lx\n",
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ret, (long) ip);
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}
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}
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while (ret > 0);
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}
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static void
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foo (void)
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{
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void *buffer[20];
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int i, n;
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printf ("\texplicit backtrace:\n");
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do_backtrace ();
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printf ("\tvia backtrace():\n");
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n = backtrace (buffer, 20);
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for (i = 0; i < n; ++i)
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printf ("[%d] ip=%p\n", i, buffer[i]);
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}
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void
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#ifdef UNW_TARGET_X86
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sighandler (int signal, struct sigcontext sc)
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#else
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sighandler (int signal, void *siginfo, struct sigcontext *sc)
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#endif
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{
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int sp;
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printf ("sighandler: got signal %d, sp=%p", signal, &sp);
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#if UNW_TARGET_IA64
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printf (" @ %lx", sc->sc_ip);
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#elif UNW_TARGET_X86
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printf (" @ %lx", sc.eip);
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#endif
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printf ("\n");
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do_backtrace();
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}
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int
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main (int argc, char **argv)
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{
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struct sigaction act;
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stack_t stk;
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printf ("Normal backtrace:\n");
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foo ();
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printf ("\nBacktrace across signal handler:\n");
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signal (SIGTERM, (sighandler_t) sighandler);
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kill (getpid (), SIGTERM);
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printf ("Backtrace across signal handler on alternate stack:\n");
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stk.ss_sp = malloc (SIGSTKSZ);
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if (!stk.ss_sp)
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panic ("failed to allocate SIGSTKSZ (%u) bytes\n", SIGSTKSZ);
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stk.ss_size = SIGSTKSZ;
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stk.ss_flags = 0;
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if (sigaltstack (&stk, NULL) < 0)
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panic ("sigaltstack: %s\n", strerror (errno));
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memset (&act, 0, sizeof (act));
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act.sa_handler = (void (*)(int)) sighandler;
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act.sa_flags = SA_ONSTACK;
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if (sigaction (SIGTERM, &act, NULL) < 0)
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panic ("sigaction: %s\n", strerror (errno));
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kill (getpid (), SIGTERM);
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return 0;
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}
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