mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-05-18 19:25:16 +02:00
9e98f15e9a
Adds new function to perform a pure stack walk without unwinding, functionally similar to backtrace() but accelerated by an address attribute cache the caller maintains across calls.
266 lines
7.3 KiB
C
266 lines
7.3 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2010 by Lassi Tuura <lat@iki.fi>
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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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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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void *addresses[2][128];
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unw_cursor_t cursor;
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ucontext_t uc;
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#if UNW_TARGET_X86_64
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unw_tdep_frame_t *cache;
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#endif
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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;
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int ret = -UNW_ENOINFO;
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int depth = 128;
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int i, n;
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if (verbose)
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printf ("\tfast 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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#if UNW_TARGET_X86_64
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if ((ret = unw_tdep_trace (&cursor, addresses[0], &depth, cache)) < 0)
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{
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unw_get_reg (&cursor, UNW_REG_IP, &ip);
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printf ("FAILURE: unw_tdep_trace() returned %d for ip=%lx\n", ret, (long) ip);
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++num_errors;
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}
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#endif
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if (ret < 0)
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{
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i = 0;
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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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addresses[0][i] = (void *) ip;
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}
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while ((ret = unw_step (&cursor)) >= 0 && ++i < 128);
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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", ret, (long) ip);
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++num_errors;
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}
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}
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if (verbose)
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for (i = 0; i < depth; ++i)
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printf ("\t #%-3d ip=%p\n", i, addresses[0][i]);
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if (verbose)
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printf ("\n\tvia backtrace():\n");
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n = backtrace (addresses[1], 128);
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if (verbose)
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for (i = 0; i < n; ++i)
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printf ("\t #%-3d ip=%p\n", i, addresses[1][i]);
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if (n != depth)
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{
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printf ("FAILURE: unw_tdep_trace() and backtrace() depths differ: %d vs. %d\n", depth, n);
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++num_errors;
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}
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else
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for (i = 1; i < depth; ++i)
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/* Allow one in difference in comparison, trace returns adjusted addresses. */
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if (labs((unw_word_t) addresses[0][i] - (unw_word_t) addresses[1][i]) > 1)
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{
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printf ("FAILURE: unw_tdep_trace() and backtrace() addresses differ at %d: %p vs. %p\n",
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i, addresses[0][n], addresses[1][n]);
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++num_errors;
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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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#if UNW_TARGET_X86_64
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cache = unw_tdep_make_frame_cache (0);
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#endif
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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 (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 | 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 UNW_TARGET_X86_64
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unw_tdep_free_frame_cache (cache);
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#endif
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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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