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https://github.com/tobast/libunwind-eh_elf.git
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134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2003-2004 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) 2003 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 "compiler.h"
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#include <libunwind.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/mman.h>
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#include <sys/resource.h>
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#define panic(args...) \
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{ fprintf (stderr, args); exit (-1); }
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int verbose;
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struct cb_data
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{
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unw_word_t ip;
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void* reg_state;
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size_t len;
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};
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static int
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dwarf_reg_states_callback(void *token,
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void *rs,
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size_t size,
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unw_word_t start_ip, unw_word_t end_ip)
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{
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struct cb_data *data = token;
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if (start_ip <= data->ip && data->ip < end_ip)
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{
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data->reg_state = mmap(NULL, size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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memcpy(data->reg_state, rs, size);
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data->len = size;
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}
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return 0;
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}
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static void
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do_backtrace (void)
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{
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unw_cursor_t cursor;
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unw_word_t ip, sp;
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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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if (verbose)
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printf ("%016lx (sp=%016lx)\n", (long) ip, (long) sp);
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struct cb_data data = {.ip = ip, .reg_state = NULL};
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ret = unw_reg_states_iterate(&cursor, dwarf_reg_states_callback, &data);
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if (ret > 0)
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{
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ret = unw_apply_reg_state (&cursor, data.reg_state);
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munmap(data.reg_state, data.len);
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}
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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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}
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while (ret > 0);
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}
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int
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consume_some_stack_space (void)
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{
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unw_cursor_t cursor;
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unw_context_t uc;
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char string[1024];
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memset (&cursor, 0, sizeof (cursor));
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memset (&uc, 0, sizeof (uc));
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return sprintf (string, "hello %p %p\n", &cursor, &uc);
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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 rlimit rlim;
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verbose = argc > 1;
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if (consume_some_stack_space () > 9999)
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exit (-1); /* can't happen, but don't let the compiler know... */
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rlim.rlim_cur = 0;
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rlim.rlim_max = RLIM_INFINITY;
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setrlimit (RLIMIT_DATA, &rlim);
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do_backtrace ();
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return 0;
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}
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