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365 lines
8.7 KiB
C
Executable File
365 lines
8.7 KiB
C
Executable File
/*** strip.c -- strip certain symbols from a rel file.
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Copyright (C) 1986, 1990 Free Software Foundation, Inc.
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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 1, 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, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* BUGS: When there's not enough memory, this should do the copy
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in pieces rather than just fail as it does now */
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#include "sysdep.h"
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#include "bfd.h"
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#include "getopt.h"
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#include <signal.h>
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/* Various program options */
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int show_version = 0;
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/* Which symbols to remove. */
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enum strip_action {
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strip_undef,
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strip_all, /* strip all symbols */
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strip_debug, /* strip all debugger symbols */
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} strip_symbols;
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/* Which local symbols to remove. */
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enum {
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locals_undef,
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locals_start_L, /* discard locals starting with L */
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locals_all, /* discard all locals */
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} discard_locals;
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extern char *mktemp();
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/* IMPORTS */
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extern char *program_version;
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extern char *program_name;
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extern char *target;
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extern char *xmalloc();
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PROTO(static boolean, strip_file, (char *filetostrip));
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PROTO(static void, copy_sections, (bfd *ibfd, sec_ptr isection, bfd *obfd));
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PROTO(static void, setup_sections, (bfd *ibfd, sec_ptr isection, bfd *obfd));
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/** main, etc */
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static void
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usage ()
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{
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fprintf (stderr, "strip %s\nUsage: %s [-gsxSX] files ...\n",
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program_version, program_name);
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exit (1);
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}
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struct option long_options[] = {{"strip-all", 0, 0, 's'},
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{"strip-debug", 0, 0, 'S'},
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{"discard-all", 0, 0, 'x'},
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{"discard-locals", 0, 0, 'X'},
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{0, 0, 0, 0}
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};
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int
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main (argc, argv)
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char **argv;
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int argc;
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{
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int ind;
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int c;
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program_name = argv[0];
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strip_symbols = strip_undef; /* default is to strip everything. */
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discard_locals = locals_undef;
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while ((c = getopt_long (argc, argv, "gsST:xX", long_options, &ind)) != EOF) {
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switch (c) {
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case 0:
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break;
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case 's':
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strip_symbols = strip_all;
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break;
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case 'g':
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case 'S':
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strip_symbols = strip_debug;
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break;
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case 'T':
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target = optarg;
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break;
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case 'x':
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discard_locals = locals_all;
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break;
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case 'X':
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discard_locals = locals_start_L;
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break;
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default:
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usage ();
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}
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}
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/* Default is to strip all symbols: */
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if (strip_symbols == strip_undef && discard_locals == locals_undef) {
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strip_symbols = strip_all;
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}
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/* OK, all options now parsed. If no filename specified, do a.out. */
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if (optind == argc) return !strip_file ("a.out");
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/* We were given several filenames to do: */
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while (optind < argc)
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if (!strip_file (argv[optind++])) return 1;
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return 0;
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}
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/** Hack signals */
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/* Why does strip need to do this, and anyway, if it does shouldn't this be
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handled by bfd? */
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static int delayed_signal;
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static int sigint_handled = 0;
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static int sighup_handled = 0;
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static int sigterm_handled = 0;
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void
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delay_signal (signo)
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int signo;
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{
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delayed_signal = signo;
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signal (signo, delay_signal);
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}
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/* Effectively defer handling of asynchronous kill signals. */
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void
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handle_sigs () /* puff puff */
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{
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delayed_signal = 0;
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if (signal (SIGINT, SIG_IGN) != SIG_IGN) {
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sigint_handled = 1;
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signal (SIGINT, delay_signal);
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}
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if (signal (SIGHUP, SIG_IGN) != SIG_IGN) {
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sighup_handled = 1;
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signal (SIGHUP, delay_signal);
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}
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if (signal (SIGTERM, SIG_IGN) != SIG_IGN) {
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sigterm_handled = 1;
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signal (SIGTERM, delay_signal);
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}
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return;
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}
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/* Effectively undefer handling. */
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void
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unhandle_sigs () /* put them down */
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{
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if (sigint_handled) signal (SIGINT, SIG_DFL);
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if (sighup_handled) signal (SIGHUP, SIG_DFL);
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if (sigterm_handled) signal (SIGTERM, SIG_DFL);
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/* Handle any signal that came in while they were deferred. */
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if (delayed_signal)
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kill (getpid (), delayed_signal);
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return;
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}
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static boolean
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strip_file (filetostrip)
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char *filetostrip;
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{
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static char template[] = "stXXXXXX";
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char *slash;
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char *tmpname;
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bfd *ibfd;
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bfd *obfd;
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ibfd = bfd_openr (filetostrip, target);
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if (ibfd == NULL) bfd_fatal (filetostrip);
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handle_sigs (); /* light up */
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if (!bfd_check_format (ibfd, bfd_object)) {
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fprintf (stderr, "Can't strip %s file %s.\n",
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bfd_format_string (bfd_get_format (ibfd)), filetostrip);
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exit (1);
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}
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slash = strrchr( filetostrip, '/' );
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if ( slash ){
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*slash = 0;
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tmpname = xmalloc( strlen(filetostrip) + sizeof(template) + 1 );
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strcpy( tmpname, filetostrip );
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strcat( tmpname, "/" );
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strcat( tmpname, template );
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mktemp( tmpname );
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*slash = '/';
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} else {
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tmpname = xmalloc( sizeof(template) );
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strcpy( tmpname, template );
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mktemp( tmpname );
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}
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obfd = bfd_openw (mktemp(tmpname), (target ? target : bfd_get_target (ibfd)));
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if (obfd == NULL) bfd_fatal (tmpname);
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if (!bfd_set_format (obfd, bfd_get_format (ibfd)))
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bfd_fatal (tmpname);
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if ((bfd_set_start_address (obfd, bfd_get_start_address (ibfd)) == false) ||
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(bfd_set_file_flags (obfd, (bfd_get_file_flags (ibfd) &
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~(HAS_LINENO | HAS_DEBUG | HAS_SYMS |
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HAS_LOCALS))) == false) ||
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bfd_set_start_address (obfd, bfd_get_start_address (ibfd)) == false)
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bfd_fatal (bfd_get_filename (ibfd));
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/* Copy architecture of input file to output file */
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if (!bfd_set_arch_mach (obfd, bfd_get_architecture (ibfd),
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bfd_get_machine (ibfd))) {
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fprintf(stderr, "Output file cannot represent architecture %s",
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bfd_printable_arch_mach (bfd_get_architecture(ibfd),
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bfd_get_machine (ibfd)));
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}
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/* bfd mandates that all output sections be created and sizes set before
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any output is done. Thus, we traverse all sections twice. */
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bfd_map_over_sections (ibfd, setup_sections, (void *)obfd);
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bfd_map_over_sections (ibfd, copy_sections, (void *)obfd);
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if (!bfd_close (obfd)) bfd_fatal (filetostrip);
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if (!bfd_close (ibfd)) bfd_fatal (filetostrip);
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rename(tmpname, filetostrip);
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free(tmpname);
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unhandle_sigs();
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return true;
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}
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/** Actually do the work */
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static void
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setup_sections (ibfd, isection, obfd)
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bfd *ibfd;
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sec_ptr isection;
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bfd *obfd;
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{
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sec_ptr osection;
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char *err;
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osection = bfd_make_section (obfd, bfd_section_name (ibfd, isection));
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if (osection == NULL) {
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err = "making";
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goto loser;
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}
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if (!bfd_set_section_size(obfd, osection, bfd_section_size(ibfd, isection))) {
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err = "size";
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goto loser;
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}
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if (!bfd_set_section_vma (obfd, osection, bfd_section_vma (ibfd, isection))) {
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err = "vma";
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goto loser;
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}
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if (bfd_set_section_alignment (obfd, osection,
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bfd_section_alignment (ibfd, isection))
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!= true) {
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err = "alignment";
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goto loser;
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} /* on error, I presume. */
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if (!bfd_set_section_flags (obfd, osection,
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bfd_get_section_flags (ibfd, isection))) {
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err = "flags";
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goto loser;
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}
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/* All went well */
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return;
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loser:
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fprintf (stderr, "%s: file \"%s\", section \"%s\": error in %s: %s\n",
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program_name,
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bfd_get_filename (ibfd), bfd_section_name (ibfd, isection),
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err, bfd_errmsg (bfd_error));
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exit (1);
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}
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static void
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copy_sections (ibfd, isection, obfd)
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bfd *ibfd;
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sec_ptr isection;
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bfd *obfd;
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{
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static unsigned char *memhunk = NULL;
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static unsigned memhunksize = 0;
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sec_ptr osection;
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unsigned long size;
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flagword iflg;
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unsigned char *temp;
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osection = bfd_get_section_by_name (obfd, bfd_section_name (ibfd, isection));
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size = bfd_section_size (ibfd, isection);
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iflg = bfd_get_section_flags (ibfd, isection);
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/* either:
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we don't need any memory because there's nothing in this section,
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we had no memory so we got some,
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we had some memory but not enough so we got more,
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or we fail to allocat. */
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if (size == 0)
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return;
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if ((iflg & SEC_HAS_CONTENTS) == 0)
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return;
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if (memhunk == NULL) {
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memhunk = (unsigned char *) xmalloc (size);
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memhunksize = size;
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}
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if (size > memhunksize) {
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temp = (unsigned char *) xrealloc ((char *) memhunk, size);
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memhunksize = size;
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memhunk = temp;
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}
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/* now we have enough memory, just do it: */
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if (!bfd_get_section_contents (ibfd, isection, memhunk, 0, size))
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bfd_fatal (bfd_get_filename (ibfd));
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if (!bfd_set_section_contents (obfd, osection, memhunk, 0, size))
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bfd_fatal (bfd_get_filename (obfd));
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}
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