mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-23 12:03:41 +01:00
0d7738ed4f
Cleanup dynamically allocated memory before exit in tests in a few places where missing. While such cleanups right before exit do not usually make much sense (as the operating system would cleanup anyway, so manual cleanups only burn CPU cycles), we will want to catch any potential problems in libunwind related to the cleanups. This also stops valgrind complaining about unreleased memory.
262 lines
7.2 KiB
C
262 lines
7.2 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 "compiler.h"
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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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#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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unw_context_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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if (unw_get_proc_info (&cursor, &pi) == 0)
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{
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printf ("\tproc=0x%lx-0x%lx\n\thandler=0x%lx lsda=0x%lx gp=0x%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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}
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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 __attribute__((unused)))
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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 __attribute__((unused)), void *context)
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{
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ucontext_t *uc UNUSED;
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int sp;
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uc = context;
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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 __attribute__((unused)))
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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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signal (SIGTERM, SIG_DFL);
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stk.ss_flags = SS_DISABLE;
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sigaltstack (&stk, NULL);
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free (stk.ss_sp);
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return 0;
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}
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