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a5ba7ad712
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/*
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A hacky replacement for backtrace_symbols in glibc
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backtrace_symbols in glibc looks up symbols using dladdr which is limited in
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the symbols that it sees. libbacktracesymbols opens the executable and shared
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libraries using libbfd and will look up backtrace information using the symbol
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table and the dwarf line information.
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It may make more sense for this program to use libelf instead of libbfd.
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However, I have not investigated that yet.
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Derived from addr2line.c from GNU Binutils by Jeff Muizelaar
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Copyright 2007 Jeff Muizelaar
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Copyright 2012 Timothy Pearson
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*/
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/* addr2line.c -- convert addresses to line number and function name
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Copyright 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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Contributed by Ulrich Lauther <Ulrich.Lauther@mchp.siemens.de>
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This file was part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define fatal(a, b) exit(1)
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#define bfd_fatal(a) exit(1)
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#define bfd_nonfatal(a) exit(1)
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#define list_matching_formats(a) exit(1)
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/* 2 characters for each byte, plus 1 each for 0, x, and NULL */
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#define PTRSTR_LEN (sizeof(void *) * 2 + 3)
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#define true 1
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#define false 0
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#define _GNU_SOURCE
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <execinfo.h>
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#include <bfd.h>
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#include <libiberty.h>
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#include <dlfcn.h>
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#include <link.h>
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#include <demangle.h>
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static asymbol **syms; /* Symbol table. */
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/* 150 isn't special; it's just an arbitrary non-ASCII char value. */
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#define OPTION_DEMANGLER (150)
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static void slurp_symtab(bfd * abfd);
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static void find_address_in_section(bfd *abfd, asection *section, void *data);
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/* Read in the symbol table. */
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static void slurp_symtab(bfd * abfd)
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{
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long symcount;
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unsigned int size;
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if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
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return;
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symcount = (long)bfd_read_minisymbols(abfd, false, (void**) & syms, &size);
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if (symcount == 0)
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symcount = bfd_read_minisymbols(abfd, true /* dynamic */ ,
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(void**) & syms, &size);
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if (symcount < 0)
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bfd_fatal(bfd_get_filename(abfd));
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}
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/* These global variables are used to pass information between
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translate_addresses and find_address_in_section. */
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static bfd_vma pc;
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static const char *filename;
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static const char *functionname;
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static unsigned int line;
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static int found;
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/* Look for an address in a section. This is called via
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bfd_map_over_sections. */
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static void find_address_in_section(bfd *abfd, asection *section, void *data __attribute__ ((__unused__)) )
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{
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bfd_vma vma;
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bfd_size_type size;
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if (found)
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return;
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if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0)
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return;
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vma = bfd_get_section_vma(abfd, section);
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if (pc < vma)
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return;
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size = bfd_section_size(abfd, section);
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if (pc >= vma + size)
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return;
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found = bfd_find_nearest_line(abfd, section, syms, pc - vma,
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&filename, &functionname, &line);
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}
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/* Read hexadecimal addresses from stdin, translate into
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file_name:line_number and optionally function name. */
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enum { Count, Print };
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static char** translate_addresses_buf(bfd * abfd, bfd_vma *addr, int naddr)
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{
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int naddr_orig = naddr;
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char b;
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int total = 0;
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int state;
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char *buf = &b;
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int len = 0;
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char **ret_buf = NULL;
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/* iterate over the formating twice.
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* the first time we count how much space we need
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* the second time we do the actual printing */
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for (state=Count; state<=Print; state++) {
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if (state == Print) {
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ret_buf = (char**)malloc(total + sizeof(char*)*naddr);
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buf = (char*)(ret_buf + naddr);
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len = total;
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}
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while (naddr) {
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if (state == Print)
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ret_buf[naddr-1] = buf;
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pc = addr[naddr-1];
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found = false;
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bfd_map_over_sections(abfd, find_address_in_section,
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(PTR) NULL);
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if (!found) {
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total += snprintf(buf, len, "[0x%llx] \?\?() \?\?:0",(long long unsigned int) addr[naddr-1]) + 1;
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} else {
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const char *name;
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name = functionname;
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if (name == NULL || *name == '\0')
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name = "??";
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if (filename != NULL) {
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const char *h;
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h = strrchr(filename, '/');
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if (h != NULL)
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filename = h + 1;
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}
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char* funcname = cplus_demangle(name, DMGL_AUTO);
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if (funcname) {
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// demangling succeeded
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total += snprintf(buf, len, "%s:%u\t%s()", filename ? filename : "??", line, funcname) + 1;
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}
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else {
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// demangling failed
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total += snprintf(buf, len, "%s:%u\t%s()", filename ? filename : "??", line, name) + 1;
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}
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}
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if (state == Print) {
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/* set buf just past the end of string */
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buf = buf + total + 1;
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}
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naddr--;
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}
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naddr = naddr_orig;
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}
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return ret_buf;
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}
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/* Process a file. */
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static char **process_file(const char *file_name, bfd_vma *addr, int naddr)
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{
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bfd *abfd;
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char **matching;
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char **ret_buf;
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abfd = bfd_openr(file_name, NULL);
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if (abfd == NULL)
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bfd_fatal(file_name);
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if (bfd_check_format(abfd, bfd_archive))
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fatal("%s: can not get addresses from archive", file_name);
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if (!bfd_check_format_matches(abfd, bfd_object, &matching)) {
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bfd_nonfatal(bfd_get_filename(abfd));
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if (bfd_get_error() ==
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bfd_error_file_ambiguously_recognized) {
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list_matching_formats(matching);
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free(matching);
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}
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xexit(1);
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}
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slurp_symtab(abfd);
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ret_buf = translate_addresses_buf(abfd, addr, naddr);
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if (syms != NULL) {
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free(syms);
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syms = NULL;
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}
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bfd_close(abfd);
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return ret_buf;
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}
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#define MAX_DEPTH 16
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struct file_match {
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const char *file;
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void *address;
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void *base;
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void *hdr;
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};
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static int find_matching_file(struct dl_phdr_info *info,
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size_t size, void *data)
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{
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struct file_match *match = data;
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/* This code is modeled from Gfind_proc_info-lsb.c:callback() from libunwind */
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long n;
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const ElfW(Phdr) *phdr;
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ElfW(Addr) load_base = info->dlpi_addr;
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phdr = info->dlpi_phdr;
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for (n = info->dlpi_phnum; --n >= 0; phdr++) {
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if (phdr->p_type == PT_LOAD) {
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ElfW(Addr) vaddr = phdr->p_vaddr + load_base;
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if (match->address >= (void*)vaddr && match->address < (void*)(vaddr + phdr->p_memsz)) {
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/* we found a match */
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match->file = info->dlpi_name;
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match->base = (void*)info->dlpi_addr;
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}
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}
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}
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return 0;
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}
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char **backtrace_symbols(void *const *buffer, int size)
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{
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int stack_depth = size - 1;
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int x,y;
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/* discard calling function */
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int total = 0;
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char ***locations;
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char **final;
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char *f_strings;
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locations = (char***)malloc(sizeof(char**) * (stack_depth+1));
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bfd_init();
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for(x=stack_depth, y=0; x>=0; x--, y++){
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struct file_match match = { .address = buffer[x] };
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char **ret_buf;
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bfd_vma addr;
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dl_iterate_phdr(find_matching_file, &match);
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addr = buffer[x] - match.base;
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if (match.file && strlen(match.file))
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ret_buf = process_file(match.file, &addr, 1);
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else
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ret_buf = process_file("/proc/self/exe", &addr, 1);
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locations[x] = ret_buf;
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total += strlen(ret_buf[0]) + 1;
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}
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/* allocate the array of char* we are going to return and extra space for
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* all of the strings */
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final = (char**)malloc(total + (stack_depth + 1) * sizeof(char*));
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/* get a pointer to the extra space */
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f_strings = (char*)(final + stack_depth + 1);
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/* fill in all of strings and pointers */
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for(x=stack_depth; x>=0; x--){
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strcpy(f_strings, locations[x][0]);
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free(locations[x]);
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final[x] = f_strings;
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f_strings += strlen(f_strings) + 1;
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}
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free(locations);
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return final;
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}
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void
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backtrace_symbols_fd(void *const *buffer, int size, int fd)
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{
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int j;
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char **strings;
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strings = backtrace_symbols(buffer, size);
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if (strings == NULL) {
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perror("backtrace_symbols");
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exit(EXIT_FAILURE);
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}
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for (j = 0; j < size; j++)
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printf("%s\n", strings[j]);
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free(strings);
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}
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