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c074abee DHW |
1 | /*** strip.c -- strip certain symbols from a rel file. |
2 | Copyright (C) 1986, 1990 Free Software Foundation, Inc. | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 1, or (at your option) | |
7 | any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
17 | ||
18 | /* BUGS: When there's not enough memory, this should do the copy | |
19 | in pieces rather than just fail as it does now */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "bfd.h" | |
23 | ||
24 | #include "getopt.h" | |
25 | ||
26 | ||
27 | ||
28 | #include <signal.h> | |
29 | ||
30 | /* Various program options */ | |
31 | ||
32 | int show_version = 0; | |
33 | ||
34 | /* Which symbols to remove. */ | |
35 | enum strip_action { | |
36 | strip_undef, | |
37 | strip_all, /* strip all symbols */ | |
38 | strip_debug, /* strip all debugger symbols */ | |
39 | } strip_symbols; | |
40 | ||
41 | /* Which local symbols to remove. */ | |
42 | enum { | |
43 | locals_undef, | |
44 | locals_start_L, /* discard locals starting with L */ | |
45 | locals_all, /* discard all locals */ | |
46 | } discard_locals; | |
47 | ||
48 | extern char *mktemp(); | |
49 | ||
50 | /* IMPORTS */ | |
51 | extern char *program_version; | |
52 | extern char *program_name; | |
53 | extern char *target; | |
54 | extern char *xmalloc(); | |
55 | ||
56 | PROTO(static boolean, strip_file, (char *filetostrip)); | |
57 | PROTO(static void, copy_sections, (bfd *ibfd, sec_ptr isection, bfd *obfd)); | |
58 | PROTO(static void, setup_sections, (bfd *ibfd, sec_ptr isection, bfd *obfd)); | |
59 | \f | |
60 | /** main, etc */ | |
61 | ||
62 | static void | |
63 | usage () | |
64 | { | |
65 | fprintf (stderr, "strip %s\nUsage: %s [-gsxSX] files ...\n", | |
66 | program_version, program_name); | |
67 | exit (1); | |
68 | } | |
69 | ||
70 | struct option long_options[] = {{"strip-all", 0, 0, 's'}, | |
71 | {"strip-debug", 0, 0, 'S'}, | |
72 | {"discard-all", 0, 0, 'x'}, | |
73 | {"discard-locals", 0, 0, 'X'}, | |
74 | {0, 0, 0, 0} | |
75 | }; | |
76 | ||
77 | int | |
78 | main (argc, argv) | |
79 | char **argv; | |
80 | int argc; | |
81 | { | |
82 | int ind; | |
83 | int c; | |
84 | program_name = argv[0]; | |
85 | ||
86 | strip_symbols = strip_undef; /* default is to strip everything. */ | |
87 | discard_locals = locals_undef; | |
88 | ||
89 | while ((c = getopt_long (argc, argv, "gsST:xX", long_options, &ind)) != EOF) { | |
90 | switch (c) { | |
91 | case 0: | |
92 | break; | |
93 | case 's': | |
94 | strip_symbols = strip_all; | |
95 | break; | |
96 | case 'g': | |
97 | case 'S': | |
98 | strip_symbols = strip_debug; | |
99 | break; | |
100 | case 'T': | |
101 | target = optarg; | |
102 | break; | |
103 | case 'x': | |
104 | discard_locals = locals_all; | |
105 | break; | |
106 | case 'X': | |
107 | discard_locals = locals_start_L; | |
108 | break; | |
109 | default: | |
110 | usage (); | |
111 | } | |
112 | } | |
113 | ||
114 | /* Default is to strip all symbols: */ | |
115 | if (strip_symbols == strip_undef && discard_locals == locals_undef) { | |
116 | strip_symbols = strip_all; | |
117 | } | |
118 | ||
119 | /* OK, all options now parsed. If no filename specified, do a.out. */ | |
120 | if (optind == argc) return !strip_file ("a.out"); | |
121 | ||
122 | /* We were given several filenames to do: */ | |
123 | while (optind < argc) | |
124 | if (!strip_file (argv[optind++])) return 1; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | \f | |
129 | /** Hack signals */ | |
130 | ||
131 | /* Why does strip need to do this, and anyway, if it does shouldn't this be | |
132 | handled by bfd? */ | |
133 | ||
134 | static int delayed_signal; | |
135 | ||
136 | static int sigint_handled = 0; | |
137 | static int sighup_handled = 0; | |
138 | static int sigterm_handled = 0; | |
139 | ||
140 | void | |
141 | delay_signal (signo) | |
142 | int signo; | |
143 | { | |
144 | delayed_signal = signo; | |
145 | signal (signo, delay_signal); | |
146 | } | |
147 | ||
148 | /* Effectively defer handling of asynchronous kill signals. */ | |
149 | void | |
150 | handle_sigs () /* puff puff */ | |
151 | { | |
152 | delayed_signal = 0; | |
153 | ||
154 | if (signal (SIGINT, SIG_IGN) != SIG_IGN) { | |
155 | sigint_handled = 1; | |
156 | signal (SIGINT, delay_signal); | |
157 | } | |
158 | ||
159 | if (signal (SIGHUP, SIG_IGN) != SIG_IGN) { | |
160 | sighup_handled = 1; | |
161 | signal (SIGHUP, delay_signal); | |
162 | } | |
163 | ||
164 | if (signal (SIGTERM, SIG_IGN) != SIG_IGN) { | |
165 | sigterm_handled = 1; | |
166 | signal (SIGTERM, delay_signal); | |
167 | } | |
168 | ||
169 | return; | |
170 | } | |
171 | ||
172 | /* Effectively undefer handling. */ | |
173 | void | |
174 | unhandle_sigs () /* put them down */ | |
175 | { | |
176 | if (sigint_handled) signal (SIGINT, SIG_DFL); | |
177 | ||
178 | if (sighup_handled) signal (SIGHUP, SIG_DFL); | |
179 | ||
180 | if (sigterm_handled) signal (SIGTERM, SIG_DFL); | |
181 | ||
182 | /* Handle any signal that came in while they were deferred. */ | |
183 | if (delayed_signal) | |
184 | kill (getpid (), delayed_signal); | |
185 | ||
186 | return; | |
187 | } | |
188 | \f | |
189 | ||
190 | static boolean | |
191 | strip_file (filetostrip) | |
192 | char *filetostrip; | |
193 | { | |
194 | static char template[] = "stXXXXXX"; | |
195 | char *slash; | |
196 | char *tmpname; | |
197 | bfd *ibfd; | |
198 | bfd *obfd; | |
199 | ||
200 | ibfd = bfd_openr (filetostrip, target); | |
201 | ||
202 | if (ibfd == NULL) bfd_fatal (filetostrip); | |
203 | ||
204 | handle_sigs (); /* light up */ | |
205 | ||
206 | if (!bfd_check_format (ibfd, bfd_object)) { | |
207 | fprintf (stderr, "Can't strip %s file %s.\n", | |
208 | bfd_format_string (bfd_get_format (ibfd)), filetostrip); | |
209 | exit (1); | |
210 | } | |
211 | ||
212 | slash = strrchr( filetostrip, '/' ); | |
213 | if ( slash ){ | |
214 | *slash = 0; | |
215 | tmpname = xmalloc( strlen(filetostrip) + sizeof(template) + 1 ); | |
216 | strcpy( tmpname, filetostrip ); | |
217 | strcat( tmpname, "/" ); | |
218 | strcat( tmpname, template ); | |
219 | mktemp( tmpname ); | |
220 | *slash = '/'; | |
221 | } else { | |
222 | tmpname = xmalloc( sizeof(template) ); | |
223 | strcpy( tmpname, template ); | |
224 | mktemp( tmpname ); | |
225 | } | |
226 | ||
227 | obfd = bfd_openw (mktemp(tmpname), (target ? target : bfd_get_target (ibfd))); | |
228 | if (obfd == NULL) bfd_fatal (tmpname); | |
229 | ||
230 | if (!bfd_set_format (obfd, bfd_get_format (ibfd))) | |
231 | bfd_fatal (tmpname); | |
232 | ||
233 | ||
234 | if ((bfd_set_start_address (obfd, bfd_get_start_address (ibfd)) == false) || | |
235 | (bfd_set_file_flags (obfd, (bfd_get_file_flags (ibfd) & | |
236 | ~(HAS_LINENO | HAS_DEBUG | HAS_SYMS | | |
237 | HAS_LOCALS))) == false) || | |
238 | bfd_set_start_address (obfd, bfd_get_start_address (ibfd)) == false) | |
239 | bfd_fatal (bfd_get_filename (ibfd)); | |
240 | ||
241 | /* Copy architecture of input file to output file */ | |
242 | if (!bfd_set_arch_mach (obfd, bfd_get_architecture (ibfd), | |
243 | bfd_get_machine (ibfd))) { | |
244 | fprintf(stderr, "Output file cannot represent architecture %s", | |
245 | bfd_printable_arch_mach (bfd_get_architecture(ibfd), | |
246 | bfd_get_machine (ibfd))); | |
247 | } | |
248 | ||
249 | ||
250 | /* bfd mandates that all output sections be created and sizes set before | |
251 | any output is done. Thus, we traverse all sections twice. */ | |
252 | bfd_map_over_sections (ibfd, setup_sections, (void *)obfd); | |
253 | bfd_map_over_sections (ibfd, copy_sections, (void *)obfd); | |
254 | ||
255 | if (!bfd_close (obfd)) bfd_fatal (filetostrip); | |
256 | if (!bfd_close (ibfd)) bfd_fatal (filetostrip); | |
257 | ||
258 | rename(tmpname, filetostrip); | |
259 | free(tmpname); | |
260 | ||
261 | unhandle_sigs(); | |
262 | ||
263 | return true; | |
264 | } | |
265 | \f | |
266 | /** Actually do the work */ | |
267 | static void | |
268 | setup_sections (ibfd, isection, obfd) | |
269 | bfd *ibfd; | |
270 | sec_ptr isection; | |
271 | bfd *obfd; | |
272 | { | |
273 | sec_ptr osection; | |
274 | char *err; | |
275 | ||
276 | osection = bfd_make_section (obfd, bfd_section_name (ibfd, isection)); | |
277 | if (osection == NULL) { | |
278 | err = "making"; | |
279 | goto loser; | |
280 | } | |
281 | ||
282 | if (!bfd_set_section_size(obfd, osection, bfd_section_size(ibfd, isection))) { | |
283 | err = "size"; | |
284 | goto loser; | |
285 | } | |
286 | ||
287 | if (!bfd_set_section_vma (obfd, osection, bfd_section_vma (ibfd, isection))) { | |
288 | err = "vma"; | |
289 | goto loser; | |
290 | } | |
291 | ||
292 | if (bfd_set_section_alignment (obfd, osection, | |
293 | bfd_section_alignment (ibfd, isection)) | |
294 | != true) { | |
295 | err = "alignment"; | |
296 | goto loser; | |
297 | } /* on error, I presume. */ | |
298 | ||
299 | if (!bfd_set_section_flags (obfd, osection, | |
300 | bfd_get_section_flags (ibfd, isection))) { | |
301 | err = "flags"; | |
302 | goto loser; | |
303 | } | |
304 | ||
305 | /* All went well */ | |
306 | return; | |
307 | ||
308 | loser: | |
309 | fprintf (stderr, "%s: file \"%s\", section \"%s\": error in %s: %s\n", | |
310 | program_name, | |
311 | bfd_get_filename (ibfd), bfd_section_name (ibfd, isection), | |
312 | err, bfd_errmsg (bfd_error)); | |
313 | exit (1); | |
314 | } | |
315 | ||
316 | static void | |
317 | copy_sections (ibfd, isection, obfd) | |
318 | bfd *ibfd; | |
319 | sec_ptr isection; | |
320 | bfd *obfd; | |
321 | { | |
322 | static unsigned char *memhunk = NULL; | |
323 | static unsigned memhunksize = 0; | |
324 | ||
325 | sec_ptr osection; | |
326 | unsigned long size; | |
327 | flagword iflg; | |
328 | unsigned char *temp; | |
329 | ||
330 | osection = bfd_get_section_by_name (obfd, bfd_section_name (ibfd, isection)); | |
331 | ||
332 | size = bfd_section_size (ibfd, isection); | |
333 | iflg = bfd_get_section_flags (ibfd, isection); | |
334 | ||
335 | /* either: | |
336 | we don't need any memory because there's nothing in this section, | |
337 | we had no memory so we got some, | |
338 | we had some memory but not enough so we got more, | |
339 | or we fail to allocat. */ | |
340 | ||
341 | if (size == 0) | |
342 | return; | |
343 | ||
344 | if ((iflg & SEC_HAS_CONTENTS) == 0) | |
345 | return; | |
346 | ||
347 | if (memhunk == NULL) { | |
348 | memhunk = (unsigned char *) xmalloc (size); | |
349 | memhunksize = size; | |
350 | } | |
351 | ||
352 | if (size > memhunksize) { | |
353 | temp = (unsigned char *) xrealloc ((char *) memhunk, size); | |
354 | memhunksize = size; | |
355 | memhunk = temp; | |
356 | } | |
357 | ||
358 | /* now we have enough memory, just do it: */ | |
359 | if (!bfd_get_section_contents (ibfd, isection, memhunk, 0, size)) | |
360 | bfd_fatal (bfd_get_filename (ibfd)); | |
361 | ||
362 | if (!bfd_set_section_contents (obfd, osection, memhunk, 0, size)) | |
363 | bfd_fatal (bfd_get_filename (obfd)); | |
364 | } |