mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-23 12:03:41 +01:00
e4593e2493
Creating an alternate signal stack with a size of SIGSTKSZ (usually 8k) is not enough on some targets because unw_cursor_t is bigger than that already. Since the size of unw_cursor_t is part of the ABI the UNW_TDEP_CURSOR_LEN can't be changed without breaking existent code. Therefore size of the alternate signal stack has been increased to 1 MiB. Signed-off-by: Ken Werner <ken.werner@linaro.org>
254 lines
7 KiB
C
254 lines
7 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2004 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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <errno.h>
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#if HAVE_EXECINFO_H
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# include <execinfo.h>
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#else
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extern int backtrace (void **, int);
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#endif
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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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#ifndef HAVE_SIGHANDLER_T
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typedef RETSIGTYPE (*sighandler_t) (int);
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#endif
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#define SIG_STACK_SIZE 0x100000
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int verbose;
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int num_errors;
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/* These variables are global because they
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* cause the signal stack to overflow */
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char buf[512], name[256];
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unw_cursor_t cursor;
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ucontext_t uc;
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static void
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do_backtrace (void)
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{
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unw_word_t ip, sp, off;
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unw_proc_info_t pi;
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int ret;
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if (verbose)
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printf ("\texplicit backtrace:\n");
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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, (long) off);
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else
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snprintf (buf, sizeof (buf), "<%s>", name);
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}
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if (verbose)
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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=%lx-%lx\n\thandler=%lx lsda=%lx gp=%lx",
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(long) pi.start_ip, (long) pi.end_ip,
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(long) pi.handler, (long) pi.lsda, (long) pi.gp);
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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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}
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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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++num_errors;
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}
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}
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while (ret > 0);
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{
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void *buffer[20];
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int i, n;
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if (verbose)
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printf ("\n\tvia backtrace():\n");
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n = backtrace (buffer, 20);
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if (verbose)
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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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}
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void
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foo (long val)
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{
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do_backtrace ();
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}
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void
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bar (long v)
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{
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extern long f (long);
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int arr[v];
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/* This is a vain attempt to use up lots of registers to force
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the frame-chain info to be saved on the memory stack on ia64.
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It happens to work with gcc v3.3.4 and gcc v3.4.1 but perhaps
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not with any other compiler. */
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foo (f (arr[0]) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
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+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + f (v))
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))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
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)))))))))))))))))))))))))))))))))))))))))))))))))))))));
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}
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void
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sighandler (int signal, void *siginfo, void *context)
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{
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ucontext_t *uc = context;
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int sp;
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if (verbose)
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{
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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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# if defined(__linux__)
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printf (" @ %lx", uc->uc_mcontext.sc_ip);
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# else
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{
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uint16_t reason;
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uint64_t ip;
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__uc_get_reason (uc, &reason);
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__uc_get_ip (uc, &ip);
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printf (" @ %lx (reason=%d)", ip, reason);
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}
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# endif
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#elif UNW_TARGET_X86
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#if defined __linux__
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printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_EIP]);
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#elif defined __FreeBSD__
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printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_eip);
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#endif
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#elif UNW_TARGET_X86_64
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#if defined __linux__
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printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_RIP]);
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#elif defined __FreeBSD__
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printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_rip);
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#endif
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#endif
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printf ("\n");
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}
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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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verbose = (argc > 1);
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if (verbose)
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printf ("Normal backtrace:\n");
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bar (1);
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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_SIGINFO;
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if (sigaction (SIGTERM, &act, NULL) < 0)
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panic ("sigaction: %s\n", strerror (errno));
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if (verbose)
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printf ("\nBacktrace across signal handler:\n");
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kill (getpid (), SIGTERM);
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if (verbose)
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printf ("\nBacktrace across signal handler on alternate stack:\n");
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stk.ss_sp = malloc (SIG_STACK_SIZE);
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if (!stk.ss_sp)
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panic ("failed to allocate %u bytes\n", SIG_STACK_SIZE);
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stk.ss_size = SIG_STACK_SIZE;
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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 | SA_SIGINFO;
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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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if (num_errors > 0)
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{
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fprintf (stderr, "FAILURE: detected %d errors\n", num_errors);
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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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return 0;
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}
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