635 lines
15 KiB
C
635 lines
15 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Hans Huebner.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*static char sccsid[] = "from: @(#)nm.c 5.8 (Berkeley) 5/2/91";*/
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static char rcsid[] = "$Id: nm.c,v 1.5 1994/12/24 17:26:46 cgd Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <a.out.h>
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#include <stab.h>
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#include <ar.h>
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#include <ranlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.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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int ignore_bad_archive_entries = 1;
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int print_only_external_symbols;
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int print_only_undefined_symbols;
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int print_all_symbols;
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int print_file_each_line;
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int fcount;
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int rev;
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int fname(), rname(), value();
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int (*sfunc)() = fname;
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/* some macros for symbol type (nlist.n_type) handling */
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#define IS_DEBUGGER_SYMBOL(x) ((x) & N_STAB)
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#define IS_EXTERNAL(x) ((x) & N_EXT)
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#define SYMBOL_TYPE(x) ((x) & (N_TYPE | N_STAB))
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void *emalloc(), *erealloc();
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/*
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* main()
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* parse command line, execute process_file() for each file
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* specified on the command line.
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*/
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern int optind;
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int ch, errors;
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while ((ch = getopt(argc, argv, "agnopruw")) != EOF) {
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switch (ch) {
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case 'a':
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print_all_symbols = 1;
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break;
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case 'g':
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print_only_external_symbols = 1;
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break;
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case 'n':
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sfunc = value;
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break;
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case 'o':
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print_file_each_line = 1;
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break;
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case 'p':
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sfunc = NULL;
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break;
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case 'r':
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rev = 1;
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break;
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case 'u':
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print_only_undefined_symbols = 1;
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break;
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case 'w':
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ignore_bad_archive_entries = 0;
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break;
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case '?':
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default:
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usage();
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}
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}
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fcount = argc - optind;
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argv += optind;
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if (rev && sfunc == fname)
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sfunc = rname;
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if (!fcount)
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errors = process_file("a.out");
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else {
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errors = 0;
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do {
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errors |= process_file(*argv);
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} while (*++argv);
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}
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exit(errors);
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}
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/*
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* process_file()
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* show symbols in the file given as an argument. Accepts archive and
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* object files as input.
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*/
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process_file(fname)
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char *fname;
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{
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struct exec exec_head;
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FILE *fp;
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int retval;
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char magic[SARMAG];
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if (!(fp = fopen(fname, "r"))) {
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(void)fprintf(stderr, "nm: cannot read %s.\n", fname);
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return(1);
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}
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if (fcount > 1)
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(void)printf("\n%s:\n", fname);
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/*
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* first check whether this is an object file - read a object
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* header, and skip back to the beginning
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*/
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if (fread((char *)&exec_head, sizeof(exec_head), (size_t)1, fp) != 1) {
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(void)fprintf(stderr, "nm: %s: bad format.\n", fname);
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(void)fclose(fp);
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return(1);
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}
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rewind(fp);
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/* this could be an archive */
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if (N_BADMAG(exec_head)) {
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if (fread(magic, sizeof(magic), (size_t)1, fp) != 1 ||
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strncmp(magic, ARMAG, SARMAG)) {
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(void)fprintf(stderr,
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"nm: %s: not object file or archive.\n", fname);
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(void)fclose(fp);
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return(1);
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}
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retval = show_archive(fname, fp);
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} else
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retval = show_objfile(fname, fp);
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(void)fclose(fp);
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return(retval);
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}
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/*
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* show_archive()
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* show symbols in the given archive file
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*/
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show_archive(fname, fp)
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char *fname;
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FILE *fp;
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{
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struct ar_hdr ar_head;
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struct exec exec_head;
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int i, rval;
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long last_ar_off;
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char *p, *name;
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int baselen, namelen;
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baselen = strlen(fname) + 3;
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namelen = sizeof(ar_head.ar_name);
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name = emalloc(baselen + namelen);
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rval = 0;
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/* while there are more entries in the archive */
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while (fread((char *)&ar_head, sizeof(ar_head), (size_t)1, fp) == 1) {
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/* bad archive entry - stop processing this archive */
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if (strncmp(ar_head.ar_fmag, ARFMAG, sizeof(ar_head.ar_fmag))) {
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(void)fprintf(stderr,
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"nm: %s: bad format archive header", fname);
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(void)free(name);
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return(1);
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}
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/* remember start position of current archive object */
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last_ar_off = ftell(fp);
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/* skip ranlib entries */
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if (!strncmp(ar_head.ar_name, RANLIBMAG, sizeof(RANLIBMAG) - 1))
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goto skip;
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/*
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* construct a name of the form "archive.a:obj.o:" for the
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* current archive entry if the object name is to be printed
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* on each output line
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*/
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p = name;
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if (print_file_each_line)
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p += sprintf(p, "%s:", fname);
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#ifdef AR_EFMT1
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/*
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* BSD 4.4 extended AR format: #1/<namelen>, with name as the
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* first <namelen> bytes of the file
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*/
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if ( (ar_head.ar_name[0] == '#') &&
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(ar_head.ar_name[1] == '1') &&
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(ar_head.ar_name[2] == '/') &&
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(isdigit(ar_head.ar_name[3]))) {
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int len = atoi(&ar_head.ar_name[3]);
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if (len > namelen) {
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p -= (long)name;
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name = (char *)erealloc(name, baselen+len);
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namelen = len;
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p += (long)name;
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}
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if (fread(p, len, 1, fp) != 1) {
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(void)fprintf(stderr,
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"nm: %s: premature EOF.\n", name);
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(void)free(name);
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return 1;
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}
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p += len;
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} else
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#endif
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for (i = 0; i < sizeof(ar_head.ar_name); ++i)
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if (ar_head.ar_name[i] && ar_head.ar_name[i] != ' ')
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*p++ = ar_head.ar_name[i];
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*p++ = '\0';
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/* get and check current object's header */
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if (fread((char *)&exec_head, sizeof(exec_head),
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(size_t)1, fp) != 1) {
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(void)fprintf(stderr, "nm: %s: premature EOF.\n", name);
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(void)free(name);
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return(1);
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}
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if (N_BADMAG(exec_head)) {
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if (!ignore_bad_archive_entries) {
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(void)fprintf(stderr,
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"nm: %s: bad format.\n", name);
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rval = 1;
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}
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} else {
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(void)fseek(fp, (long)-sizeof(exec_head),
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SEEK_CUR);
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if (!print_file_each_line)
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(void)printf("\n%s:\n", name);
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rval |= show_objfile(name, fp);
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}
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/*
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* skip to next archive object - it starts at the next
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* even byte boundary
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*/
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#define even(x) (((x) + 1) & ~1)
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skip: if (fseek(fp, last_ar_off + even(atol(ar_head.ar_size)),
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SEEK_SET)) {
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(void)fprintf(stderr,
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"nm: %s: %s\n", fname, strerror(errno));
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(void)free(name);
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return(1);
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}
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}
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(void)free(name);
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return(rval);
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}
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/*
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* show_objfile()
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* show symbols from the object file pointed to by fp. The current
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* file pointer for fp is expected to be at the beginning of an a.out
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* header.
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*/
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show_objfile(objname, fp)
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char *objname;
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FILE *fp;
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{
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register struct nlist *names, *np;
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register int i, nnames, nrawnames;
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struct exec head;
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long stabsize;
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char *stab;
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/* read a.out header */
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if (fread((char *)&head, sizeof(head), (size_t)1, fp) != 1) {
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(void)fprintf(stderr,
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"nm: %s: cannot read header.\n", objname);
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return(1);
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}
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/*
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* skip back to the header - the N_-macros return values relative
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* to the beginning of the a.out header
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*/
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if (fseek(fp, (long)-sizeof(head), SEEK_CUR)) {
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(void)fprintf(stderr,
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"nm: %s: %s\n", objname, strerror(errno));
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return(1);
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}
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/* stop if this is no valid object file */
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if (N_BADMAG(head)) {
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(void)fprintf(stderr,
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"nm: %s: bad format.\n", objname);
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return(1);
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}
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/* stop if the object file contains no symbol table */
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if (!head.a_syms) {
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(void)fprintf(stderr,
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"nm: %s: no name list.\n", objname);
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return(1);
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}
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if (fseek(fp, (long)N_SYMOFF(head), SEEK_CUR)) {
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(void)fprintf(stderr,
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"nm: %s: %s\n", objname, strerror(errno));
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return(1);
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}
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/* get memory for the symbol table */
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names = emalloc((size_t)head.a_syms);
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nrawnames = head.a_syms / sizeof(*names);
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if (fread((char *)names, (size_t)head.a_syms, (size_t)1, fp) != 1) {
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(void)fprintf(stderr,
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"nm: %s: cannot read symbol table.\n", objname);
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(void)free((char *)names);
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return(1);
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}
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/*
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* Following the symbol table comes the string table. The first
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* 4-byte-integer gives the total size of the string table
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* _including_ the size specification itself.
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*/
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if (fread((char *)&stabsize, sizeof(stabsize), (size_t)1, fp) != 1) {
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(void)fprintf(stderr,
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"nm: %s: cannot read stab size.\n", objname);
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(void)free((char *)names);
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return(1);
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}
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stab = emalloc((size_t)stabsize);
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/*
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* read the string table offset by 4 - all indices into the string
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* table include the size specification.
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*/
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stabsize -= 4; /* we already have the size */
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if (fread(stab + 4, (size_t)stabsize, (size_t)1, fp) != 1) {
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(void)fprintf(stderr,
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"nm: %s: stab truncated..\n", objname);
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(void)free((char *)names);
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(void)free(stab);
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return(1);
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}
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/*
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* fix up the symbol table and filter out unwanted entries
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*
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* common symbols are characterized by a n_type of N_UNDF and a
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* non-zero n_value -- change n_type to N_COMM for all such
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* symbols to make life easier later.
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*
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* filter out all entries which we don't want to print anyway
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*/
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for (np = names, i = nnames = 0; i < nrawnames; np++, i++) {
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if (SYMBOL_TYPE(np->n_type) == N_UNDF && np->n_value)
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np->n_type = N_COMM | (np->n_type & N_EXT);
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if (!print_all_symbols && IS_DEBUGGER_SYMBOL(np->n_type))
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continue;
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if (print_only_external_symbols && !IS_EXTERNAL(np->n_type))
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continue;
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if (print_only_undefined_symbols &&
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SYMBOL_TYPE(np->n_type) != N_UNDF)
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continue;
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/*
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* make n_un.n_name a character pointer by adding the string
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* table's base to n_un.n_strx
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*
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* don't mess with zero offsets
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*/
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if (np->n_un.n_strx)
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np->n_un.n_name = stab + np->n_un.n_strx;
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else
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np->n_un.n_name = "";
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names[nnames++] = *np;
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}
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/* sort the symbol table if applicable */
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if (sfunc)
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qsort((char *)names, (size_t)nnames, sizeof(*names), sfunc);
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/* print out symbols */
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for (np = names, i = 0; i < nnames; np++, i++)
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print_symbol(objname, np);
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(void)free((char *)names);
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(void)free(stab);
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return(0);
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}
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/*
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* print_symbol()
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* show one symbol
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*/
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print_symbol(objname, sym)
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char *objname;
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register struct nlist *sym;
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{
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char *typestring(), typeletter();
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if (print_file_each_line)
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(void)printf("%s:", objname);
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/*
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* handle undefined-only format seperately (no space is
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* left for symbol values, no type field is printed)
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*/
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if (print_only_undefined_symbols) {
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(void)puts(sym->n_un.n_name);
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return;
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}
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/* print symbol's value */
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if (SYMBOL_TYPE(sym->n_type) == N_UNDF)
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(void)printf(" ");
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else
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(void)printf("%08lx", sym->n_value);
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/* print type information */
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if (IS_DEBUGGER_SYMBOL(sym->n_type))
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(void)printf(" - %02x %04x %5s ", sym->n_other,
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sym->n_desc&0xffff, typestring(sym->n_type));
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else
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(void)printf(" %c ", typeletter(sym->n_type));
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/* print the symbol's name */
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(void)puts(sym->n_un.n_name);
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}
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/*
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* typestring()
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* return the a description string for an STAB entry
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*/
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char *
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typestring(type)
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register u_char type;
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{
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switch(type) {
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case N_BCOMM:
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return("BCOMM");
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case N_ECOML:
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return("ECOML");
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case N_ECOMM:
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return("ECOMM");
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case N_ENTRY:
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return("ENTRY");
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case N_FNAME:
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return("FNAME");
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case N_FUN:
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return("FUN");
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case N_GSYM:
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return("GSYM");
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case N_LBRAC:
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return("LBRAC");
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case N_LCSYM:
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return("LCSYM");
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case N_LENG:
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return("LENG");
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case N_LSYM:
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return("LSYM");
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case N_PC:
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return("PC");
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case N_PSYM:
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return("PSYM");
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case N_RBRAC:
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return("RBRAC");
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case N_RSYM:
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return("RSYM");
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case N_SLINE:
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return("SLINE");
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case N_SO:
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return("SO");
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case N_SOL:
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return("SOL");
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case N_SSYM:
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return("SSYM");
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case N_STSYM:
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return("STSYM");
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}
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return("???");
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}
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/*
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* typeletter()
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* return a description letter for the given basic type code of an
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* symbol table entry. The return value will be upper case for
|
|
* external, lower case for internal symbols.
|
|
*/
|
|
char
|
|
typeletter(type)
|
|
u_char type;
|
|
{
|
|
switch(SYMBOL_TYPE(type)) {
|
|
case N_ABS:
|
|
return(IS_EXTERNAL(type) ? 'A' : 'a');
|
|
case N_BSS:
|
|
return(IS_EXTERNAL(type) ? 'B' : 'b');
|
|
case N_COMM:
|
|
return(IS_EXTERNAL(type) ? 'C' : 'c');
|
|
case N_DATA:
|
|
return(IS_EXTERNAL(type) ? 'D' : 'd');
|
|
case N_FN:
|
|
/* NOTE: N_FN == N_WARNING,
|
|
* in this case, the N_EXT bit is to considered as
|
|
* part of the symbol's type itself.
|
|
*/
|
|
return(IS_EXTERNAL(type) ? 'F' : 'W');
|
|
case N_TEXT:
|
|
return(IS_EXTERNAL(type) ? 'T' : 't');
|
|
case N_INDR:
|
|
return(IS_EXTERNAL(type) ? 'I' : 'i');
|
|
case N_SIZE:
|
|
return(IS_EXTERNAL(type) ? 'S' : 's');
|
|
case N_UNDF:
|
|
return(IS_EXTERNAL(type) ? 'U' : 'u');
|
|
}
|
|
return('?');
|
|
}
|
|
|
|
fname(a0, b0)
|
|
void *a0, *b0;
|
|
{
|
|
struct nlist *a = a0, *b = b0;
|
|
|
|
return(strcmp(a->n_un.n_name, b->n_un.n_name));
|
|
}
|
|
|
|
rname(a0, b0)
|
|
void *a0, *b0;
|
|
{
|
|
struct nlist *a = a0, *b = b0;
|
|
|
|
return(strcmp(b->n_un.n_name, a->n_un.n_name));
|
|
}
|
|
|
|
value(a0, b0)
|
|
void *a0, *b0;
|
|
{
|
|
register struct nlist *a = a0, *b = b0;
|
|
|
|
if (SYMBOL_TYPE(a->n_type) == N_UNDF)
|
|
if (SYMBOL_TYPE(b->n_type) == N_UNDF)
|
|
return(0);
|
|
else
|
|
return(-1);
|
|
else if (SYMBOL_TYPE(b->n_type) == N_UNDF)
|
|
return(1);
|
|
if (rev) {
|
|
if (a->n_value == b->n_value)
|
|
return(rname(a0, b0));
|
|
return(b->n_value > a->n_value ? 1 : -1);
|
|
} else {
|
|
if (a->n_value == b->n_value)
|
|
return(fname(a0, b0));
|
|
return(a->n_value > b->n_value ? 1 : -1);
|
|
}
|
|
}
|
|
|
|
void *
|
|
emalloc(size)
|
|
size_t size;
|
|
{
|
|
char *p;
|
|
|
|
/* NOSTRICT */
|
|
if (p = malloc(size))
|
|
return(p);
|
|
(void)fprintf(stderr, "nm: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
void *
|
|
erealloc(p, size)
|
|
void *p;
|
|
size_t size;
|
|
{
|
|
/* NOSTRICT */
|
|
if (p = realloc(p, size))
|
|
return(p);
|
|
(void)fprintf(stderr, "nm: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
usage()
|
|
{
|
|
(void)fprintf(stderr, "usage: nm [-agnopruw] [file ...]\n");
|
|
exit(1);
|
|
}
|