1 /*-
2 * Copyright (c) 2007-2013 Kai Wang
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/param.h>
28 #include <sys/stat.h>
29
30 #include <err.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <getopt.h>
34 #include <libelftc.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39
40 #include "elfcopy.h"
41
42 ELFTC_VCSID("$Id: main.c 3577 2017-09-14 02:19:42Z emaste $");
43
44 enum options
45 {
46 ECP_ADD_GNU_DEBUGLINK,
47 ECP_ADD_SECTION,
48 ECP_CHANGE_ADDR,
49 ECP_CHANGE_SEC_ADDR,
50 ECP_CHANGE_SEC_LMA,
51 ECP_CHANGE_SEC_VMA,
52 ECP_CHANGE_START,
53 ECP_CHANGE_WARN,
54 ECP_GAP_FILL,
55 ECP_GLOBALIZE_SYMBOL,
56 ECP_GLOBALIZE_SYMBOLS,
57 ECP_KEEP_SYMBOLS,
58 ECP_KEEP_GLOBAL_SYMBOLS,
59 ECP_LOCALIZE_HIDDEN,
60 ECP_LOCALIZE_SYMBOLS,
61 ECP_NO_CHANGE_WARN,
62 ECP_ONLY_DEBUG,
63 ECP_ONLY_DWO,
64 ECP_PAD_TO,
65 ECP_PREFIX_ALLOC,
66 ECP_PREFIX_SEC,
67 ECP_PREFIX_SYM,
68 ECP_REDEF_SYMBOL,
69 ECP_REDEF_SYMBOLS,
70 ECP_RENAME_SECTION,
71 ECP_SET_OSABI,
72 ECP_SET_SEC_FLAGS,
73 ECP_SET_START,
74 ECP_SREC_FORCE_S3,
75 ECP_SREC_LEN,
76 ECP_STRIP_DWO,
77 ECP_STRIP_SYMBOLS,
78 ECP_STRIP_UNNEEDED,
79 ECP_WEAKEN_ALL,
80 ECP_WEAKEN_SYMBOLS
81 };
82
83 static struct option mcs_longopts[] =
84 {
85 { "help", no_argument, NULL, 'h' },
86 { "version", no_argument, NULL, 'V' },
87 { NULL, 0, NULL, 0 }
88 };
89
90 static struct option strip_longopts[] =
91 {
92 {"discard-all", no_argument, NULL, 'x'},
93 {"discard-locals", no_argument, NULL, 'X'},
94 {"help", no_argument, NULL, 'h'},
95 {"input-target", required_argument, NULL, 'I'},
96 {"keep-symbol", required_argument, NULL, 'K'},
97 {"only-keep-debug", no_argument, NULL, ECP_ONLY_DEBUG},
98 {"output-file", required_argument, NULL, 'o'},
99 {"output-target", required_argument, NULL, 'O'},
100 {"preserve-dates", no_argument, NULL, 'p'},
101 {"remove-section", required_argument, NULL, 'R'},
102 {"strip-all", no_argument, NULL, 's'},
103 {"strip-debug", no_argument, NULL, 'S'},
104 {"strip-symbol", required_argument, NULL, 'N'},
105 {"strip-unneeded", no_argument, NULL, ECP_STRIP_UNNEEDED},
106 {"version", no_argument, NULL, 'V'},
107 {"wildcard", no_argument, NULL, 'w'},
108 {NULL, 0, NULL, 0}
109 };
110
111 static struct option elfcopy_longopts[] =
112 {
113 {"add-gnu-debuglink", required_argument, NULL, ECP_ADD_GNU_DEBUGLINK},
114 {"add-section", required_argument, NULL, ECP_ADD_SECTION},
115 {"adjust-section-vma", required_argument, NULL, ECP_CHANGE_SEC_ADDR},
116 {"adjust-vma", required_argument, NULL, ECP_CHANGE_ADDR},
117 {"adjust-start", required_argument, NULL, ECP_CHANGE_START},
118 {"adjust-warnings", no_argument, NULL, ECP_CHANGE_WARN},
119 {"binary-architecture", required_argument, NULL, 'B'},
120 {"change-addresses", required_argument, NULL, ECP_CHANGE_ADDR},
121 {"change-section-address", required_argument, NULL,
122 ECP_CHANGE_SEC_ADDR},
123 {"change-section-lma", required_argument, NULL, ECP_CHANGE_SEC_LMA},
124 {"change-section-vma", required_argument, NULL, ECP_CHANGE_SEC_VMA},
125 {"change-start", required_argument, NULL, ECP_CHANGE_START},
126 {"change-warnings", no_argument, NULL, ECP_CHANGE_WARN},
127 {"discard-all", no_argument, NULL, 'x'},
128 {"discard-locals", no_argument, NULL, 'X'},
129 {"extract-dwo", no_argument, NULL, ECP_ONLY_DWO},
130 {"gap-fill", required_argument, NULL, ECP_GAP_FILL},
131 {"globalize-symbol", required_argument, NULL, ECP_GLOBALIZE_SYMBOL},
132 {"globalize-symbols", required_argument, NULL, ECP_GLOBALIZE_SYMBOLS},
133 {"help", no_argument, NULL, 'h'},
134 {"input-target", required_argument, NULL, 'I'},
135 {"keep-symbol", required_argument, NULL, 'K'},
136 {"keep-symbols", required_argument, NULL, ECP_KEEP_SYMBOLS},
137 {"keep-global-symbol", required_argument, NULL, 'G'},
138 {"keep-global-symbols", required_argument, NULL,
139 ECP_KEEP_GLOBAL_SYMBOLS},
140 {"localize-hidden", no_argument, NULL, ECP_LOCALIZE_HIDDEN},
141 {"localize-symbol", required_argument, NULL, 'L'},
142 {"localize-symbols", required_argument, NULL, ECP_LOCALIZE_SYMBOLS},
143 {"no-adjust-warnings", no_argument, NULL, ECP_NO_CHANGE_WARN},
144 {"no-change-warnings", no_argument, NULL, ECP_NO_CHANGE_WARN},
145 {"only-keep-debug", no_argument, NULL, ECP_ONLY_DEBUG},
146 {"only-section", required_argument, NULL, 'j'},
147 {"osabi", required_argument, NULL, ECP_SET_OSABI},
148 {"output-target", required_argument, NULL, 'O'},
149 {"pad-to", required_argument, NULL, ECP_PAD_TO},
150 {"preserve-dates", no_argument, NULL, 'p'},
151 {"prefix-alloc-sections", required_argument, NULL, ECP_PREFIX_ALLOC},
152 {"prefix-sections", required_argument, NULL, ECP_PREFIX_SEC},
153 {"prefix-symbols", required_argument, NULL, ECP_PREFIX_SYM},
154 {"redefine-sym", required_argument, NULL, ECP_REDEF_SYMBOL},
155 {"redefine-syms", required_argument, NULL, ECP_REDEF_SYMBOLS},
156 {"remove-section", required_argument, NULL, 'R'},
157 {"rename-section", required_argument, NULL, ECP_RENAME_SECTION},
158 {"set-section-flags", required_argument, NULL, ECP_SET_SEC_FLAGS},
159 {"set-start", required_argument, NULL, ECP_SET_START},
160 {"srec-forceS3", no_argument, NULL, ECP_SREC_FORCE_S3},
161 {"srec-len", required_argument, NULL, ECP_SREC_LEN},
162 {"strip-all", no_argument, NULL, 'S'},
163 {"strip-debug", no_argument, 0, 'g'},
164 {"strip-dwo", no_argument, NULL, ECP_STRIP_DWO},
165 {"strip-symbol", required_argument, NULL, 'N'},
166 {"strip-symbols", required_argument, NULL, ECP_STRIP_SYMBOLS},
167 {"strip-unneeded", no_argument, NULL, ECP_STRIP_UNNEEDED},
168 {"version", no_argument, NULL, 'V'},
169 {"weaken", no_argument, NULL, ECP_WEAKEN_ALL},
170 {"weaken-symbol", required_argument, NULL, 'W'},
171 {"weaken-symbols", required_argument, NULL, ECP_WEAKEN_SYMBOLS},
172 {"wildcard", no_argument, NULL, 'w'},
173 {NULL, 0, NULL, 0}
174 };
175
176 static struct {
177 const char *name;
178 int value;
179 } sec_flags[] = {
180 {"alloc", SF_ALLOC},
181 {"load", SF_LOAD},
182 {"noload", SF_NOLOAD},
183 {"readonly", SF_READONLY},
184 {"debug", SF_DEBUG},
185 {"code", SF_CODE},
186 {"data", SF_DATA},
187 {"rom", SF_ROM},
188 {"share", SF_SHARED},
189 {"contents", SF_CONTENTS},
190 {NULL, 0}
191 };
192
193 static struct {
194 const char *name;
195 int abi;
196 } osabis[] = {
197 {"sysv", ELFOSABI_SYSV},
198 {"hpus", ELFOSABI_HPUX},
199 {"netbsd", ELFOSABI_NETBSD},
200 {"linux", ELFOSABI_LINUX},
201 {"hurd", ELFOSABI_HURD},
202 {"86open", ELFOSABI_86OPEN},
203 {"solaris", ELFOSABI_SOLARIS},
204 {"aix", ELFOSABI_AIX},
205 {"irix", ELFOSABI_IRIX},
206 {"freebsd", ELFOSABI_FREEBSD},
207 {"tru64", ELFOSABI_TRU64},
208 {"modesto", ELFOSABI_MODESTO},
209 {"openbsd", ELFOSABI_OPENBSD},
210 {"openvms", ELFOSABI_OPENVMS},
211 {"nsk", ELFOSABI_NSK},
212 {"cloudabi", ELFOSABI_CLOUDABI},
213 {"arm", ELFOSABI_ARM},
214 {"standalone", ELFOSABI_STANDALONE},
215 {NULL, 0}
216 };
217
218 static int copy_from_tempfile(const char *src, const char *dst,
219 int infd, int *outfd, int in_place);
220 static void create_file(struct elfcopy *ecp, const char *src,
221 const char *dst);
222 static void elfcopy_main(struct elfcopy *ecp, int argc, char **argv);
223 static void elfcopy_usage(void);
224 static void mcs_main(struct elfcopy *ecp, int argc, char **argv);
225 static void mcs_usage(void);
226 static void parse_sec_address_op(struct elfcopy *ecp, int optnum,
227 const char *optname, char *s);
228 static void parse_sec_flags(struct sec_action *sac, char *s);
229 static void parse_symlist_file(struct elfcopy *ecp, const char *fn,
230 unsigned int op);
231 static void print_version(void);
232 static void set_input_target(struct elfcopy *ecp, const char *target_name);
233 static void set_osabi(struct elfcopy *ecp, const char *abi);
234 static void set_output_target(struct elfcopy *ecp, const char *target_name);
235 static void strip_main(struct elfcopy *ecp, int argc, char **argv);
236 static void strip_usage(void);
237
238 /*
239 * An ELF object usually has a structure described by the
240 * diagram below.
241 * _____________
242 * | |
243 * | NULL | <- always a SHT_NULL section
244 * |_____________|
245 * | |
246 * | .interp |
247 * |_____________|
248 * | |
249 * | ... |
250 * |_____________|
251 * | |
252 * | .text |
253 * |_____________|
254 * | |
255 * | ... |
256 * |_____________|
257 * | |
258 * | .comment | <- above(include) this: normal sections
259 * |_____________|
260 * | |
261 * | add sections| <- unloadable sections added by --add-section
262 * |_____________|
263 * | |
264 * | .shstrtab | <- section name string table
265 * |_____________|
266 * | |
267 * | shdrs | <- section header table
268 * |_____________|
269 * | |
270 * | .symtab | <- symbol table, if any
271 * |_____________|
272 * | |
273 * | .strtab | <- symbol name string table, if any
274 * |_____________|
275 * | |
276 * | .rel.text | <- relocation info for .o files.
277 * |_____________|
278 */
279 void
create_elf(struct elfcopy * ecp)280 create_elf(struct elfcopy *ecp)
281 {
282 struct section *shtab;
283 GElf_Ehdr ieh;
284 GElf_Ehdr oeh;
285 size_t ishnum;
286
287 ecp->flags |= SYMTAB_INTACT;
288 ecp->flags &= ~SYMTAB_EXIST;
289
290 /* Create EHDR. */
291 if (gelf_getehdr(ecp->ein, &ieh) == NULL)
292 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
293 elf_errmsg(-1));
294 if ((ecp->iec = gelf_getclass(ecp->ein)) == ELFCLASSNONE)
295 errx(EXIT_FAILURE, "getclass() failed: %s",
296 elf_errmsg(-1));
297
298 if (ecp->oec == ELFCLASSNONE)
299 ecp->oec = ecp->iec;
300 if (ecp->oed == ELFDATANONE)
301 ecp->oed = ieh.e_ident[EI_DATA];
302
303 if (gelf_newehdr(ecp->eout, ecp->oec) == NULL)
304 errx(EXIT_FAILURE, "gelf_newehdr failed: %s",
305 elf_errmsg(-1));
306 if (gelf_getehdr(ecp->eout, &oeh) == NULL)
307 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
308 elf_errmsg(-1));
309
310 memcpy(oeh.e_ident, ieh.e_ident, sizeof(ieh.e_ident));
311 oeh.e_ident[EI_CLASS] = ecp->oec;
312 oeh.e_ident[EI_DATA] = ecp->oed;
313 if (ecp->abi != -1)
314 oeh.e_ident[EI_OSABI] = ecp->abi;
315 oeh.e_flags = ieh.e_flags;
316 oeh.e_machine = ieh.e_machine;
317 oeh.e_type = ieh.e_type;
318 oeh.e_entry = ieh.e_entry;
319 oeh.e_version = ieh.e_version;
320
321 ecp->flags &= ~(EXECUTABLE | DYNAMIC | RELOCATABLE);
322 if (ieh.e_type == ET_EXEC)
323 ecp->flags |= EXECUTABLE;
324 else if (ieh.e_type == ET_DYN)
325 ecp->flags |= DYNAMIC;
326 else if (ieh.e_type == ET_REL)
327 ecp->flags |= RELOCATABLE;
328 else
329 errx(EXIT_FAILURE, "unsupported e_type");
330
331 if (!elf_getshnum(ecp->ein, &ishnum))
332 errx(EXIT_FAILURE, "elf_getshnum failed: %s",
333 elf_errmsg(-1));
334 if (ishnum > 0 && (ecp->secndx = calloc(ishnum,
335 sizeof(*ecp->secndx))) == NULL)
336 err(EXIT_FAILURE, "calloc failed");
337
338 /* Read input object program header. */
339 setup_phdr(ecp);
340
341 /*
342 * Scan of input sections: we iterate through sections from input
343 * object, skip sections need to be stripped, allot Elf_Scn and
344 * create internal section structure for sections we want.
345 * (i.e., determine output sections)
346 */
347 create_scn(ecp);
348
349 /* Apply section address changes, if any. */
350 adjust_addr(ecp);
351
352 /*
353 * Determine if the symbol table needs to be changed based on
354 * command line options.
355 */
356 if (ecp->strip == STRIP_DEBUG ||
357 ecp->strip == STRIP_UNNEEDED ||
358 ecp->flags & WEAKEN_ALL ||
359 ecp->flags & LOCALIZE_HIDDEN ||
360 ecp->flags & DISCARD_LOCAL ||
361 ecp->flags & DISCARD_LLABEL ||
362 ecp->prefix_sym != NULL ||
363 !STAILQ_EMPTY(&ecp->v_symop))
364 ecp->flags &= ~SYMTAB_INTACT;
365
366 /*
367 * Create symbol table. Symbols are filtered or stripped according to
368 * command line args specified by user, and later updated for the new
369 * layout of sections in the output object.
370 */
371 if ((ecp->flags & SYMTAB_EXIST) != 0)
372 create_symtab(ecp);
373
374 /*
375 * Write the underlying ehdr. Note that it should be called
376 * before elf_setshstrndx() since it will overwrite e->e_shstrndx.
377 */
378 if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
379 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
380 elf_errmsg(-1));
381
382 /*
383 * First processing of output sections: at this stage we copy the
384 * content of each section from input to output object. Section
385 * content will be modified and printed (mcs) if need. Also content of
386 * relocation section probably will be filtered and updated according
387 * to symbol table changes.
388 */
389 copy_content(ecp);
390
391 /*
392 * Second processing of output sections: Update section headers.
393 * At this stage we set name string index, update st_link and st_info
394 * for output sections.
395 */
396 update_shdr(ecp, 1);
397
398 /* Renew oeh to get the updated e_shstrndx. */
399 if (gelf_getehdr(ecp->eout, &oeh) == NULL)
400 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
401 elf_errmsg(-1));
402
403 /*
404 * Insert SHDR table into the internal section list as a "pseudo"
405 * section, so later it will get sorted and resynced just as "normal"
406 * sections.
407 *
408 * Under FreeBSD, Binutils objcopy always put the section header
409 * at the end of all the sections. We want to do the same here.
410 *
411 * However, note that the behaviour is still different with Binutils:
412 * elfcopy checks the FreeBSD OSABI tag to tell whether it needs to
413 * move the section headers, while Binutils is probably configured
414 * this way when it's compiled on FreeBSD.
415 */
416 if (oeh.e_ident[EI_OSABI] == ELFOSABI_FREEBSD)
417 shtab = insert_shtab(ecp, 1);
418 else
419 shtab = insert_shtab(ecp, 0);
420
421 /*
422 * Resync section offsets in the output object. This is needed
423 * because probably sections are modified or new sections are added,
424 * as a result overlap/gap might appears.
425 */
426 resync_sections(ecp);
427
428 /* Store SHDR offset in EHDR. */
429 oeh.e_shoff = shtab->off;
430
431 /* Put program header table immediately after the Elf header. */
432 if (ecp->ophnum > 0) {
433 oeh.e_phoff = gelf_fsize(ecp->eout, ELF_T_EHDR, 1, EV_CURRENT);
434 if (oeh.e_phoff == 0)
435 errx(EXIT_FAILURE, "gelf_fsize() failed: %s",
436 elf_errmsg(-1));
437 }
438
439 /*
440 * Update ELF object entry point if requested.
441 */
442 if (ecp->change_addr != 0)
443 oeh.e_entry += ecp->change_addr;
444 if (ecp->flags & SET_START)
445 oeh.e_entry = ecp->set_start;
446 if (ecp->change_start != 0)
447 oeh.e_entry += ecp->change_start;
448
449 /*
450 * Update ehdr again before we call elf_update(), since we
451 * modified e_shoff and e_phoff.
452 */
453 if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
454 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
455 elf_errmsg(-1));
456
457 if (ecp->ophnum > 0)
458 copy_phdr(ecp);
459
460 /* Write out the output elf object. */
461 if (elf_update(ecp->eout, ELF_C_WRITE) < 0)
462 errx(EXIT_FAILURE, "elf_update() failed: %s",
463 elf_errmsg(-1));
464
465 /* Release allocated resource. */
466 free_elf(ecp);
467 }
468
469 void
free_elf(struct elfcopy * ecp)470 free_elf(struct elfcopy *ecp)
471 {
472 struct segment *seg, *seg_temp;
473 struct section *sec, *sec_temp;
474
475 /* Free internal segment list. */
476 if (!STAILQ_EMPTY(&ecp->v_seg)) {
477 STAILQ_FOREACH_SAFE(seg, &ecp->v_seg, seg_list, seg_temp) {
478 STAILQ_REMOVE(&ecp->v_seg, seg, segment, seg_list);
479 free(seg);
480 }
481 }
482
483 /* Free symbol table buffers. */
484 free_symtab(ecp);
485
486 /* Free section name string table. */
487 elftc_string_table_destroy(ecp->shstrtab->strtab);
488
489 /* Free internal section list. */
490 if (!TAILQ_EMPTY(&ecp->v_sec)) {
491 TAILQ_FOREACH_SAFE(sec, &ecp->v_sec, sec_list, sec_temp) {
492 TAILQ_REMOVE(&ecp->v_sec, sec, sec_list);
493 if (sec->buf != NULL)
494 free(sec->buf);
495 if (sec->newname != NULL)
496 free(sec->newname);
497 if (sec->pad != NULL)
498 free(sec->pad);
499 free(sec);
500 }
501 }
502
503 ecp->symtab = NULL;
504 ecp->strtab = NULL;
505 ecp->shstrtab = NULL;
506
507 if (ecp->secndx != NULL) {
508 free(ecp->secndx);
509 ecp->secndx = NULL;
510 }
511 }
512
513 /* Create a temporary file. */
514 void
create_tempfile(char ** fn,int * fd)515 create_tempfile(char **fn, int *fd)
516 {
517 const char *tmpdir;
518 char *cp, *tmpf;
519 size_t tlen, plen;
520
521 #define _TEMPFILE "ecp.XXXXXXXX"
522 #define _TEMPFILEPATH "/tmp/ecp.XXXXXXXX"
523
524 if (fn == NULL || fd == NULL)
525 return;
526 /* Repect TMPDIR environment variable. */
527 tmpdir = getenv("TMPDIR");
528 if (tmpdir != NULL && *tmpdir != '\0') {
529 tlen = strlen(tmpdir);
530 plen = strlen(_TEMPFILE);
531 tmpf = malloc(tlen + plen + 2);
532 if (tmpf == NULL)
533 err(EXIT_FAILURE, "malloc failed");
534 strncpy(tmpf, tmpdir, tlen);
535 cp = &tmpf[tlen - 1];
536 if (*cp++ != '/')
537 *cp++ = '/';
538 strncpy(cp, _TEMPFILE, plen);
539 cp[plen] = '\0';
540 } else {
541 tmpf = strdup(_TEMPFILEPATH);
542 if (tmpf == NULL)
543 err(EXIT_FAILURE, "strdup failed");
544 }
545 if ((*fd = mkstemp(tmpf)) == -1)
546 err(EXIT_FAILURE, "mkstemp %s failed", tmpf);
547 if (fchmod(*fd, 0644) == -1)
548 err(EXIT_FAILURE, "fchmod %s failed", tmpf);
549 *fn = tmpf;
550
551 #undef _TEMPFILE
552 #undef _TEMPFILEPATH
553 }
554
555 /*
556 * Copy temporary file with path src and file descriptor infd to path dst.
557 * If in_place is set act as if editing the file in place, avoiding rename()
558 * to preserve hard and symbolic links. Output file remains open, with file
559 * descriptor returned in outfd.
560 */
561 static int
copy_from_tempfile(const char * src,const char * dst,int infd,int * outfd,int in_place)562 copy_from_tempfile(const char *src, const char *dst, int infd, int *outfd,
563 int in_place)
564 {
565 int tmpfd;
566
567 /*
568 * First, check if we can use rename().
569 */
570 if (in_place == 0) {
571 if (rename(src, dst) >= 0) {
572 *outfd = infd;
573 return (0);
574 } else if (errno != EXDEV)
575 return (-1);
576
577 /*
578 * If the rename() failed due to 'src' and 'dst' residing in
579 * two different file systems, invoke a helper function in
580 * libelftc to do the copy.
581 */
582
583 if (unlink(dst) < 0)
584 return (-1);
585 }
586
587 if ((tmpfd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, 0755)) < 0)
588 return (-1);
589
590 if (elftc_copyfile(infd, tmpfd) < 0)
591 return (-1);
592
593 /*
594 * Remove the temporary file from the file system
595 * namespace, and close its file descriptor.
596 */
597 if (unlink(src) < 0)
598 return (-1);
599
600 (void) close(infd);
601
602 /*
603 * Return the file descriptor for the destination.
604 */
605 *outfd = tmpfd;
606
607 return (0);
608 }
609
610 static void
create_file(struct elfcopy * ecp,const char * src,const char * dst)611 create_file(struct elfcopy *ecp, const char *src, const char *dst)
612 {
613 struct stat sb;
614 char *tempfile, *elftemp;
615 int efd, ifd, ofd, ofd0, tfd;
616 int in_place;
617
618 tempfile = NULL;
619
620 if (src == NULL)
621 errx(EXIT_FAILURE, "internal: src == NULL");
622 if ((ifd = open(src, O_RDONLY)) == -1)
623 err(EXIT_FAILURE, "open %s failed", src);
624
625 if (fstat(ifd, &sb) == -1)
626 err(EXIT_FAILURE, "fstat %s failed", src);
627
628 if (dst == NULL)
629 create_tempfile(&tempfile, &ofd);
630 else
631 if ((ofd = open(dst, O_RDWR|O_CREAT, 0755)) == -1)
632 err(EXIT_FAILURE, "open %s failed", dst);
633
634 #ifndef LIBELF_AR
635 /* Detect and process ar(1) archive using libarchive. */
636 if (ac_detect_ar(ifd)) {
637 ac_create_ar(ecp, ifd, ofd);
638 goto copy_done;
639 }
640 #endif
641
642 if (lseek(ifd, 0, SEEK_SET) < 0)
643 err(EXIT_FAILURE, "lseek failed");
644
645 /*
646 * If input object is not ELF file, convert it to an intermediate
647 * ELF object before processing.
648 */
649 if (ecp->itf != ETF_ELF) {
650 /*
651 * If the output object is not an ELF file, choose an arbitrary
652 * ELF format for the intermediate file. srec, ihex and binary
653 * formats are independent of class, endianness and machine
654 * type so these choices do not affect the output.
655 */
656 if (ecp->otf != ETF_ELF) {
657 if (ecp->oec == ELFCLASSNONE)
658 ecp->oec = ELFCLASS64;
659 if (ecp->oed == ELFDATANONE)
660 ecp->oed = ELFDATA2LSB;
661 }
662 create_tempfile(&elftemp, &efd);
663 if ((ecp->eout = elf_begin(efd, ELF_C_WRITE, NULL)) == NULL)
664 errx(EXIT_FAILURE, "elf_begin() failed: %s",
665 elf_errmsg(-1));
666 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
667 if (ecp->itf == ETF_BINARY)
668 create_elf_from_binary(ecp, ifd, src);
669 else if (ecp->itf == ETF_IHEX)
670 create_elf_from_ihex(ecp, ifd);
671 else if (ecp->itf == ETF_SREC)
672 create_elf_from_srec(ecp, ifd);
673 else
674 errx(EXIT_FAILURE, "Internal: invalid target flavour");
675 elf_end(ecp->eout);
676
677 /* Open intermediate ELF object as new input object. */
678 close(ifd);
679 if ((ifd = open(elftemp, O_RDONLY)) == -1)
680 err(EXIT_FAILURE, "open %s failed", src);
681 close(efd);
682 if (unlink(elftemp) < 0)
683 err(EXIT_FAILURE, "unlink %s failed", elftemp);
684 free(elftemp);
685 }
686
687 if ((ecp->ein = elf_begin(ifd, ELF_C_READ, NULL)) == NULL)
688 errx(EXIT_FAILURE, "elf_begin() failed: %s",
689 elf_errmsg(-1));
690
691 switch (elf_kind(ecp->ein)) {
692 case ELF_K_NONE:
693 errx(EXIT_FAILURE, "file format not recognized");
694 case ELF_K_ELF:
695 if ((ecp->eout = elf_begin(ofd, ELF_C_WRITE, NULL)) == NULL)
696 errx(EXIT_FAILURE, "elf_begin() failed: %s",
697 elf_errmsg(-1));
698
699 /* elfcopy(1) manage ELF layout by itself. */
700 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
701
702 /*
703 * Create output ELF object.
704 */
705 create_elf(ecp);
706 elf_end(ecp->eout);
707
708 /*
709 * Convert the output ELF object to binary/srec/ihex if need.
710 */
711 if (ecp->otf != ETF_ELF) {
712 /*
713 * Create (another) tempfile for binary/srec/ihex
714 * output object.
715 */
716 if (tempfile != NULL) {
717 if (unlink(tempfile) < 0)
718 err(EXIT_FAILURE, "unlink %s failed",
719 tempfile);
720 free(tempfile);
721 }
722 create_tempfile(&tempfile, &ofd0);
723
724
725 /*
726 * Rewind the file descriptor being processed.
727 */
728 if (lseek(ofd, 0, SEEK_SET) < 0)
729 err(EXIT_FAILURE,
730 "lseek failed for the output object");
731
732 /*
733 * Call flavour-specific conversion routine.
734 */
735 switch (ecp->otf) {
736 case ETF_BINARY:
737 create_binary(ofd, ofd0);
738 break;
739 case ETF_IHEX:
740 create_ihex(ofd, ofd0);
741 break;
742 case ETF_SREC:
743 create_srec(ecp, ofd, ofd0,
744 dst != NULL ? dst : src);
745 break;
746 case ETF_PE:
747 case ETF_EFI:
748 #if WITH_PE
749 create_pe(ecp, ofd, ofd0);
750 #else
751 errx(EXIT_FAILURE, "PE/EFI support not enabled"
752 " at compile time");
753 #endif
754 break;
755 default:
756 errx(EXIT_FAILURE, "Internal: unsupported"
757 " output flavour %d", ecp->oec);
758 }
759
760 close(ofd);
761 ofd = ofd0;
762 }
763
764 break;
765
766 case ELF_K_AR:
767 /* XXX: Not yet supported. */
768 break;
769 default:
770 errx(EXIT_FAILURE, "file format not supported");
771 }
772
773 elf_end(ecp->ein);
774
775 #ifndef LIBELF_AR
776 copy_done:
777 #endif
778
779 if (tempfile != NULL) {
780 in_place = 0;
781 if (dst == NULL) {
782 dst = src;
783 if (lstat(dst, &sb) != -1 &&
784 (sb.st_nlink > 1 || S_ISLNK(sb.st_mode)))
785 in_place = 1;
786 }
787
788 if (copy_from_tempfile(tempfile, dst, ofd, &tfd, in_place) < 0)
789 err(EXIT_FAILURE, "creation of %s failed", dst);
790
791 free(tempfile);
792 tempfile = NULL;
793
794 ofd = tfd;
795 }
796
797 if (strcmp(dst, "/dev/null") && fchmod(ofd, sb.st_mode) == -1)
798 err(EXIT_FAILURE, "fchmod %s failed", dst);
799
800 if ((ecp->flags & PRESERVE_DATE) &&
801 elftc_set_timestamps(dst, &sb) < 0)
802 err(EXIT_FAILURE, "setting timestamps failed");
803
804 close(ifd);
805 close(ofd);
806 }
807
808 static void
elfcopy_main(struct elfcopy * ecp,int argc,char ** argv)809 elfcopy_main(struct elfcopy *ecp, int argc, char **argv)
810 {
811 struct sec_action *sac;
812 const char *infile, *outfile;
813 char *fn, *s;
814 int opt;
815
816 while ((opt = getopt_long(argc, argv, "dB:gG:I:j:K:L:N:O:pR:s:SwW:xXV",
817 elfcopy_longopts, NULL)) != -1) {
818 switch(opt) {
819 case 'B':
820 /* ignored */
821 break;
822 case 'R':
823 sac = lookup_sec_act(ecp, optarg, 1);
824 if (sac->copy != 0)
825 errx(EXIT_FAILURE,
826 "both copy and remove specified");
827 sac->remove = 1;
828 ecp->flags |= SEC_REMOVE;
829 break;
830 case 'S':
831 ecp->strip = STRIP_ALL;
832 break;
833 case 'g':
834 ecp->strip = STRIP_DEBUG;
835 break;
836 case 'G':
837 ecp->flags |= KEEP_GLOBAL;
838 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEPG);
839 break;
840 case 'I':
841 case 's':
842 set_input_target(ecp, optarg);
843 break;
844 case 'j':
845 sac = lookup_sec_act(ecp, optarg, 1);
846 if (sac->remove != 0)
847 errx(EXIT_FAILURE,
848 "both copy and remove specified");
849 sac->copy = 1;
850 ecp->flags |= SEC_COPY;
851 break;
852 case 'K':
853 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
854 break;
855 case 'L':
856 add_to_symop_list(ecp, optarg, NULL, SYMOP_LOCALIZE);
857 break;
858 case 'N':
859 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
860 break;
861 case 'O':
862 set_output_target(ecp, optarg);
863 break;
864 case 'p':
865 ecp->flags |= PRESERVE_DATE;
866 break;
867 case 'V':
868 print_version();
869 break;
870 case 'w':
871 ecp->flags |= WILDCARD;
872 break;
873 case 'W':
874 add_to_symop_list(ecp, optarg, NULL, SYMOP_WEAKEN);
875 break;
876 case 'x':
877 ecp->flags |= DISCARD_LOCAL;
878 break;
879 case 'X':
880 ecp->flags |= DISCARD_LLABEL;
881 break;
882 case ECP_ADD_GNU_DEBUGLINK:
883 ecp->debuglink = optarg;
884 break;
885 case ECP_ADD_SECTION:
886 add_section(ecp, optarg);
887 break;
888 case ECP_CHANGE_ADDR:
889 ecp->change_addr = (int64_t) strtoll(optarg, NULL, 0);
890 break;
891 case ECP_CHANGE_SEC_ADDR:
892 parse_sec_address_op(ecp, opt, "--change-section-addr",
893 optarg);
894 break;
895 case ECP_CHANGE_SEC_LMA:
896 parse_sec_address_op(ecp, opt, "--change-section-lma",
897 optarg);
898 break;
899 case ECP_CHANGE_SEC_VMA:
900 parse_sec_address_op(ecp, opt, "--change-section-vma",
901 optarg);
902 break;
903 case ECP_CHANGE_START:
904 ecp->change_start = (int64_t) strtoll(optarg, NULL, 0);
905 break;
906 case ECP_CHANGE_WARN:
907 /* default */
908 break;
909 case ECP_GAP_FILL:
910 ecp->fill = (uint8_t) strtoul(optarg, NULL, 0);
911 ecp->flags |= GAP_FILL;
912 break;
913 case ECP_GLOBALIZE_SYMBOL:
914 add_to_symop_list(ecp, optarg, NULL, SYMOP_GLOBALIZE);
915 break;
916 case ECP_GLOBALIZE_SYMBOLS:
917 parse_symlist_file(ecp, optarg, SYMOP_GLOBALIZE);
918 break;
919 case ECP_KEEP_SYMBOLS:
920 parse_symlist_file(ecp, optarg, SYMOP_KEEP);
921 break;
922 case ECP_KEEP_GLOBAL_SYMBOLS:
923 parse_symlist_file(ecp, optarg, SYMOP_KEEPG);
924 break;
925 case ECP_LOCALIZE_HIDDEN:
926 ecp->flags |= LOCALIZE_HIDDEN;
927 break;
928 case ECP_LOCALIZE_SYMBOLS:
929 parse_symlist_file(ecp, optarg, SYMOP_LOCALIZE);
930 break;
931 case ECP_NO_CHANGE_WARN:
932 ecp->flags |= NO_CHANGE_WARN;
933 break;
934 case ECP_ONLY_DEBUG:
935 ecp->strip = STRIP_NONDEBUG;
936 break;
937 case ECP_ONLY_DWO:
938 ecp->strip = STRIP_NONDWO;
939 break;
940 case ECP_PAD_TO:
941 ecp->pad_to = (uint64_t) strtoull(optarg, NULL, 0);
942 break;
943 case ECP_PREFIX_ALLOC:
944 ecp->prefix_alloc = optarg;
945 break;
946 case ECP_PREFIX_SEC:
947 ecp->prefix_sec = optarg;
948 break;
949 case ECP_PREFIX_SYM:
950 ecp->prefix_sym = optarg;
951 break;
952 case ECP_REDEF_SYMBOL:
953 if ((s = strchr(optarg, '=')) == NULL)
954 errx(EXIT_FAILURE,
955 "illegal format for --redefine-sym");
956 *s++ = '\0';
957 add_to_symop_list(ecp, optarg, s, SYMOP_REDEF);
958 break;
959 case ECP_REDEF_SYMBOLS:
960 parse_symlist_file(ecp, optarg, SYMOP_REDEF);
961 break;
962 case ECP_RENAME_SECTION:
963 if ((fn = strchr(optarg, '=')) == NULL)
964 errx(EXIT_FAILURE,
965 "illegal format for --rename-section");
966 *fn++ = '\0';
967
968 /* Check for optional flags. */
969 if ((s = strchr(fn, ',')) != NULL)
970 *s++ = '\0';
971
972 sac = lookup_sec_act(ecp, optarg, 1);
973 sac->rename = 1;
974 sac->newname = fn;
975 if (s != NULL)
976 parse_sec_flags(sac, s);
977 break;
978 case ECP_SET_OSABI:
979 set_osabi(ecp, optarg);
980 break;
981 case ECP_SET_SEC_FLAGS:
982 if ((s = strchr(optarg, '=')) == NULL)
983 errx(EXIT_FAILURE,
984 "illegal format for --set-section-flags");
985 *s++ = '\0';
986 sac = lookup_sec_act(ecp, optarg, 1);
987 parse_sec_flags(sac, s);
988 break;
989 case ECP_SET_START:
990 ecp->flags |= SET_START;
991 ecp->set_start = (uint64_t) strtoull(optarg, NULL, 0);
992 break;
993 case ECP_SREC_FORCE_S3:
994 ecp->flags |= SREC_FORCE_S3;
995 break;
996 case ECP_SREC_LEN:
997 ecp->flags |= SREC_FORCE_LEN;
998 ecp->srec_len = strtoul(optarg, NULL, 0);
999 break;
1000 case ECP_STRIP_DWO:
1001 ecp->strip = STRIP_DWO;
1002 break;
1003 case ECP_STRIP_SYMBOLS:
1004 parse_symlist_file(ecp, optarg, SYMOP_STRIP);
1005 break;
1006 case ECP_STRIP_UNNEEDED:
1007 ecp->strip = STRIP_UNNEEDED;
1008 break;
1009 case ECP_WEAKEN_ALL:
1010 ecp->flags |= WEAKEN_ALL;
1011 break;
1012 case ECP_WEAKEN_SYMBOLS:
1013 parse_symlist_file(ecp, optarg, SYMOP_WEAKEN);
1014 break;
1015 default:
1016 elfcopy_usage();
1017 }
1018 }
1019
1020 argc -= optind;
1021 argv += optind;
1022
1023 if (argc == 0 || argc > 2)
1024 elfcopy_usage();
1025
1026 infile = argv[0];
1027 outfile = NULL;
1028 if (argc > 1)
1029 outfile = argv[1];
1030
1031 create_file(ecp, infile, outfile);
1032 }
1033
1034 static void
mcs_main(struct elfcopy * ecp,int argc,char ** argv)1035 mcs_main(struct elfcopy *ecp, int argc, char **argv)
1036 {
1037 struct sec_action *sac;
1038 const char *string;
1039 int append, delete, compress, name, print;
1040 int opt, i;
1041
1042 append = delete = compress = name = print = 0;
1043 string = NULL;
1044 while ((opt = getopt_long(argc, argv, "a:cdhn:pV", mcs_longopts,
1045 NULL)) != -1) {
1046 switch(opt) {
1047 case 'a':
1048 append = 1;
1049 string = optarg; /* XXX multiple -a not supported */
1050 break;
1051 case 'c':
1052 compress = 1;
1053 break;
1054 case 'd':
1055 delete = 1;
1056 break;
1057 case 'n':
1058 name = 1;
1059 (void)lookup_sec_act(ecp, optarg, 1);
1060 break;
1061 case 'p':
1062 print = 1;
1063 break;
1064 case 'V':
1065 print_version();
1066 break;
1067 case 'h':
1068 default:
1069 mcs_usage();
1070 }
1071 }
1072
1073 argc -= optind;
1074 argv += optind;
1075
1076 if (argc == 0)
1077 mcs_usage();
1078
1079 /* Must specify one operation at least. */
1080 if (!append && !compress && !delete && !print)
1081 mcs_usage();
1082
1083 /*
1084 * If we are going to delete, ignore other operations. This is
1085 * different from the Solaris implementation, which can print
1086 * and delete a section at the same time, for example. Also, this
1087 * implementation do not respect the order between operations that
1088 * user specified, i.e., "mcs -pc a.out" equals to "mcs -cp a.out".
1089 */
1090 if (delete) {
1091 append = compress = print = 0;
1092 ecp->flags |= SEC_REMOVE;
1093 }
1094 if (append)
1095 ecp->flags |= SEC_APPEND;
1096 if (compress)
1097 ecp->flags |= SEC_COMPRESS;
1098 if (print)
1099 ecp->flags |= SEC_PRINT;
1100
1101 /* .comment is the default section to operate on. */
1102 if (!name)
1103 (void)lookup_sec_act(ecp, ".comment", 1);
1104
1105 STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) {
1106 sac->append = append;
1107 sac->compress = compress;
1108 sac->print = print;
1109 sac->remove = delete;
1110 sac->string = string;
1111 }
1112
1113 for (i = 0; i < argc; i++) {
1114 /* If only -p is specified, output to /dev/null */
1115 if (print && !append && !compress && !delete)
1116 create_file(ecp, argv[i], "/dev/null");
1117 else
1118 create_file(ecp, argv[i], NULL);
1119 }
1120 }
1121
1122 static void
strip_main(struct elfcopy * ecp,int argc,char ** argv)1123 strip_main(struct elfcopy *ecp, int argc, char **argv)
1124 {
1125 struct sec_action *sac;
1126 const char *outfile;
1127 int opt;
1128 int i;
1129
1130 outfile = NULL;
1131 while ((opt = getopt_long(argc, argv, "hI:K:N:o:O:pR:sSdgVxXw",
1132 strip_longopts, NULL)) != -1) {
1133 switch(opt) {
1134 case 'R':
1135 sac = lookup_sec_act(ecp, optarg, 1);
1136 sac->remove = 1;
1137 ecp->flags |= SEC_REMOVE;
1138 break;
1139 case 's':
1140 ecp->strip = STRIP_ALL;
1141 break;
1142 case 'S':
1143 case 'g':
1144 case 'd':
1145 ecp->strip = STRIP_DEBUG;
1146 break;
1147 case 'I':
1148 /* ignored */
1149 break;
1150 case 'K':
1151 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
1152 break;
1153 case 'N':
1154 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
1155 break;
1156 case 'o':
1157 outfile = optarg;
1158 break;
1159 case 'O':
1160 set_output_target(ecp, optarg);
1161 break;
1162 case 'p':
1163 ecp->flags |= PRESERVE_DATE;
1164 break;
1165 case 'V':
1166 print_version();
1167 break;
1168 case 'w':
1169 ecp->flags |= WILDCARD;
1170 break;
1171 case 'x':
1172 ecp->flags |= DISCARD_LOCAL;
1173 break;
1174 case 'X':
1175 ecp->flags |= DISCARD_LLABEL;
1176 break;
1177 case ECP_ONLY_DEBUG:
1178 ecp->strip = STRIP_NONDEBUG;
1179 break;
1180 case ECP_STRIP_UNNEEDED:
1181 ecp->strip = STRIP_UNNEEDED;
1182 break;
1183 case 'h':
1184 default:
1185 strip_usage();
1186 }
1187 }
1188
1189 argc -= optind;
1190 argv += optind;
1191
1192 if (ecp->strip == 0 &&
1193 ((ecp->flags & DISCARD_LOCAL) == 0) &&
1194 ((ecp->flags & DISCARD_LLABEL) == 0) &&
1195 lookup_symop_list(ecp, NULL, SYMOP_STRIP) == NULL)
1196 ecp->strip = STRIP_ALL;
1197 if (argc == 0)
1198 strip_usage();
1199 /*
1200 * Only accept a single input file if an output file had been
1201 * specified.
1202 */
1203 if (outfile != NULL && argc != 1)
1204 strip_usage();
1205
1206 for (i = 0; i < argc; i++)
1207 create_file(ecp, argv[i], outfile);
1208 }
1209
1210 static void
parse_sec_flags(struct sec_action * sac,char * s)1211 parse_sec_flags(struct sec_action *sac, char *s)
1212 {
1213 const char *flag;
1214 int found, i;
1215
1216 for (flag = strtok(s, ","); flag; flag = strtok(NULL, ",")) {
1217 found = 0;
1218 for (i = 0; sec_flags[i].name != NULL; i++)
1219 if (strcasecmp(sec_flags[i].name, flag) == 0) {
1220 sac->flags |= sec_flags[i].value;
1221 found = 1;
1222 break;
1223 }
1224 if (!found)
1225 errx(EXIT_FAILURE, "unrecognized section flag %s",
1226 flag);
1227 }
1228 }
1229
1230 static void
parse_sec_address_op(struct elfcopy * ecp,int optnum,const char * optname,char * s)1231 parse_sec_address_op(struct elfcopy *ecp, int optnum, const char *optname,
1232 char *s)
1233 {
1234 struct sec_action *sac;
1235 const char *name;
1236 char *v;
1237 char op;
1238
1239 name = v = s;
1240 do {
1241 v++;
1242 } while (*v != '\0' && *v != '=' && *v != '+' && *v != '-');
1243 if (*v == '\0' || *(v + 1) == '\0')
1244 errx(EXIT_FAILURE, "invalid format for %s", optname);
1245 op = *v;
1246 *v++ = '\0';
1247 sac = lookup_sec_act(ecp, name, 1);
1248 switch (op) {
1249 case '=':
1250 if (optnum == ECP_CHANGE_SEC_LMA ||
1251 optnum == ECP_CHANGE_SEC_ADDR) {
1252 sac->setlma = 1;
1253 sac->lma = (uint64_t) strtoull(v, NULL, 0);
1254 }
1255 if (optnum == ECP_CHANGE_SEC_VMA ||
1256 optnum == ECP_CHANGE_SEC_ADDR) {
1257 sac->setvma = 1;
1258 sac->vma = (uint64_t) strtoull(v, NULL, 0);
1259 }
1260 break;
1261 case '+':
1262 if (optnum == ECP_CHANGE_SEC_LMA ||
1263 optnum == ECP_CHANGE_SEC_ADDR)
1264 sac->lma_adjust = (int64_t) strtoll(v, NULL, 0);
1265 if (optnum == ECP_CHANGE_SEC_VMA ||
1266 optnum == ECP_CHANGE_SEC_ADDR)
1267 sac->vma_adjust = (int64_t) strtoll(v, NULL, 0);
1268 break;
1269 case '-':
1270 if (optnum == ECP_CHANGE_SEC_LMA ||
1271 optnum == ECP_CHANGE_SEC_ADDR)
1272 sac->lma_adjust = (int64_t) -strtoll(v, NULL, 0);
1273 if (optnum == ECP_CHANGE_SEC_VMA ||
1274 optnum == ECP_CHANGE_SEC_ADDR)
1275 sac->vma_adjust = (int64_t) -strtoll(v, NULL, 0);
1276 break;
1277 default:
1278 break;
1279 }
1280 }
1281
1282 static void
parse_symlist_file(struct elfcopy * ecp,const char * fn,unsigned int op)1283 parse_symlist_file(struct elfcopy *ecp, const char *fn, unsigned int op)
1284 {
1285 struct symfile *sf;
1286 struct stat sb;
1287 FILE *fp;
1288 char *data, *p, *line, *end, *e, *n;
1289
1290 if (stat(fn, &sb) == -1)
1291 err(EXIT_FAILURE, "stat %s failed", fn);
1292
1293 /* Check if we already read and processed this file. */
1294 STAILQ_FOREACH(sf, &ecp->v_symfile, symfile_list) {
1295 if (sf->dev == sb.st_dev && sf->ino == sb.st_ino)
1296 goto process_symfile;
1297 }
1298
1299 if ((fp = fopen(fn, "r")) == NULL)
1300 err(EXIT_FAILURE, "can not open %s", fn);
1301 if ((data = malloc(sb.st_size + 1)) == NULL)
1302 err(EXIT_FAILURE, "malloc failed");
1303 if (sb.st_size > 0)
1304 if (fread(data, sb.st_size, 1, fp) != 1)
1305 err(EXIT_FAILURE, "fread failed");
1306 fclose(fp);
1307 data[sb.st_size] = '\0';
1308
1309 if ((sf = calloc(1, sizeof(*sf))) == NULL)
1310 err(EXIT_FAILURE, "malloc failed");
1311 sf->dev = sb.st_dev;
1312 sf->ino = sb.st_ino;
1313 sf->size = sb.st_size + 1;
1314 sf->data = data;
1315
1316 process_symfile:
1317
1318 /*
1319 * Basically what we do here is to convert EOL to '\0', and remove
1320 * leading and trailing whitespaces for each line.
1321 */
1322
1323 end = sf->data + sf->size;
1324 line = NULL;
1325 for(p = sf->data; p < end; p++) {
1326 if ((*p == '\t' || *p == ' ') && line == NULL)
1327 continue;
1328 if (*p == '\r' || *p == '\n' || *p == '\0') {
1329 *p = '\0';
1330 if (line == NULL)
1331 continue;
1332
1333 /* Skip comment. */
1334 if (*line == '#') {
1335 line = NULL;
1336 continue;
1337 }
1338
1339 e = p - 1;
1340 while(e != line && (*e == '\t' || *e == ' '))
1341 *e-- = '\0';
1342 if (op != SYMOP_REDEF)
1343 add_to_symop_list(ecp, line, NULL, op);
1344 else {
1345 if (strlen(line) < 3)
1346 errx(EXIT_FAILURE,
1347 "illegal format for"
1348 " --redefine-sym");
1349 for(n = line + 1; n < e; n++) {
1350 if (*n == ' ' || *n == '\t') {
1351 while(*n == ' ' || *n == '\t')
1352 *n++ = '\0';
1353 break;
1354 }
1355 }
1356 if (n >= e)
1357 errx(EXIT_FAILURE,
1358 "illegal format for"
1359 " --redefine-sym");
1360 add_to_symop_list(ecp, line, n, op);
1361 }
1362 line = NULL;
1363 continue;
1364 }
1365
1366 if (line == NULL)
1367 line = p;
1368 }
1369 }
1370
1371 static void
set_input_target(struct elfcopy * ecp,const char * target_name)1372 set_input_target(struct elfcopy *ecp, const char *target_name)
1373 {
1374 Elftc_Bfd_Target *tgt;
1375
1376 if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1377 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1378 ecp->itf = elftc_bfd_target_flavor(tgt);
1379 }
1380
1381 static void
set_output_target(struct elfcopy * ecp,const char * target_name)1382 set_output_target(struct elfcopy *ecp, const char *target_name)
1383 {
1384 Elftc_Bfd_Target *tgt;
1385
1386 if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1387 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1388 ecp->otf = elftc_bfd_target_flavor(tgt);
1389 if (ecp->otf == ETF_ELF) {
1390 ecp->oec = elftc_bfd_target_class(tgt);
1391 ecp->oed = elftc_bfd_target_byteorder(tgt);
1392 ecp->oem = elftc_bfd_target_machine(tgt);
1393 }
1394 if (ecp->otf == ETF_EFI || ecp->otf == ETF_PE)
1395 ecp->oem = elftc_bfd_target_machine(tgt);
1396
1397 ecp->otgt = target_name;
1398 }
1399
1400 static void
set_osabi(struct elfcopy * ecp,const char * abi)1401 set_osabi(struct elfcopy *ecp, const char *abi)
1402 {
1403 int i, found;
1404
1405 found = 0;
1406 for (i = 0; osabis[i].name != NULL; i++)
1407 if (strcasecmp(osabis[i].name, abi) == 0) {
1408 ecp->abi = osabis[i].abi;
1409 found = 1;
1410 break;
1411 }
1412 if (!found)
1413 errx(EXIT_FAILURE, "unrecognized OSABI %s", abi);
1414 }
1415
1416 #define ELFCOPY_USAGE_MESSAGE "\
1417 Usage: %s [options] infile [outfile]\n\
1418 Transform object files.\n\n\
1419 Options:\n\
1420 -d | -g | --strip-debug Remove debugging information from the output.\n\
1421 -j SECTION | --only-section=SECTION\n\
1422 Copy only the named section to the output.\n\
1423 -p | --preserve-dates Preserve access and modification times.\n\
1424 -w | --wildcard Use shell-style patterns to name symbols.\n\
1425 -x | --discard-all Do not copy non-globals to the output.\n\
1426 -I FORMAT | --input-target=FORMAT\n\
1427 Specify object format for the input file.\n\
1428 -K SYM | --keep-symbol=SYM Copy symbol SYM to the output.\n\
1429 -L SYM | --localize-symbol=SYM\n\
1430 Make symbol SYM local to the output file.\n\
1431 -N SYM | --strip-symbol=SYM Do not copy symbol SYM to the output.\n\
1432 -O FORMAT | --output-target=FORMAT\n\
1433 Specify object format for the output file.\n\
1434 FORMAT should be a target name understood by\n\
1435 elftc_bfd_find_target(3).\n\
1436 -R NAME | --remove-section=NAME\n\
1437 Remove the named section.\n\
1438 -S | --strip-all Remove all symbol and relocation information\n\
1439 from the output.\n\
1440 -V | --version Print a version identifier and exit.\n\
1441 -W SYM | --weaken-symbol=SYM Mark symbol SYM as weak in the output.\n\
1442 -X | --discard-locals Do not copy compiler generated symbols to\n\
1443 the output.\n\
1444 --add-section NAME=FILE Add the contents of FILE to the ELF object as\n\
1445 a new section named NAME.\n\
1446 --adjust-section-vma SECTION{=,+,-}VAL | \\\n\
1447 --change-section-address SECTION{=,+,-}VAL\n\
1448 Set or adjust the VMA and the LMA of the\n\
1449 named section by VAL.\n\
1450 --adjust-start=INCR | --change-start=INCR\n\
1451 Add INCR to the start address for the ELF\n\
1452 object.\n\
1453 --adjust-vma=INCR | --change-addresses=INCR\n\
1454 Increase the VMA and LMA of all sections by\n\
1455 INCR.\n\
1456 --adjust-warning | --change-warnings\n\
1457 Issue warnings for non-existent sections.\n\
1458 --change-section-lma SECTION{=,+,-}VAL\n\
1459 Set or adjust the LMA address of the named\n\
1460 section by VAL.\n\
1461 --change-section-vma SECTION{=,+,-}VAL\n\
1462 Set or adjust the VMA address of the named\n\
1463 section by VAL.\n\
1464 --gap-fill=VAL Fill the gaps between sections with bytes\n\
1465 of value VAL.\n\
1466 --localize-hidden Make all hidden symbols local to the output\n\
1467 file.\n\
1468 --no-adjust-warning| --no-change-warnings\n\
1469 Do not issue warnings for non-existent\n\
1470 sections.\n\
1471 --only-keep-debug Copy only debugging information.\n\
1472 --output-target=FORMAT Use the specified format for the output.\n\
1473 --pad-to=ADDRESS Pad the output object up to the given address.\n\
1474 --prefix-alloc-sections=STRING\n\
1475 Prefix the section names of all the allocated\n\
1476 sections with STRING.\n\
1477 --prefix-sections=STRING Prefix the section names of all the sections\n\
1478 with STRING.\n\
1479 --prefix-symbols=STRING Prefix the symbol names of all the symbols\n\
1480 with STRING.\n\
1481 --rename-section OLDNAME=NEWNAME[,FLAGS]\n\
1482 Rename and optionally change section flags.\n\
1483 --set-section-flags SECTION=FLAGS\n\
1484 Set section flags for the named section.\n\
1485 Supported flags are: 'alloc', 'code',\n\
1486 'contents', 'data', 'debug', 'load',\n\
1487 'noload', 'readonly', 'rom', and 'shared'.\n\
1488 --set-start=ADDRESS Set the start address of the ELF object.\n\
1489 --srec-forceS3 Only generate S3 S-Records.\n\
1490 --srec-len=LEN Set the maximum length of a S-Record line.\n\
1491 --strip-unneeded Do not copy relocation information.\n"
1492
1493 static void
elfcopy_usage(void)1494 elfcopy_usage(void)
1495 {
1496 (void) fprintf(stderr, ELFCOPY_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1497 exit(EXIT_FAILURE);
1498 }
1499
1500 #define MCS_USAGE_MESSAGE "\
1501 Usage: %s [options] file...\n\
1502 Manipulate the comment section in an ELF object.\n\n\
1503 Options:\n\
1504 -a STRING Append 'STRING' to the comment section.\n\
1505 -c Remove duplicate entries from the comment section.\n\
1506 -d Delete the comment section.\n\
1507 -h | --help Print a help message and exit.\n\
1508 -n NAME Operate on the ELF section with name 'NAME'.\n\
1509 -p Print the contents of the comment section.\n\
1510 -V | --version Print a version identifier and exit.\n"
1511
1512 static void
mcs_usage(void)1513 mcs_usage(void)
1514 {
1515 (void) fprintf(stderr, MCS_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1516 exit(EXIT_FAILURE);
1517 }
1518
1519 #define STRIP_USAGE_MESSAGE "\
1520 Usage: %s [options] file...\n\
1521 Discard information from ELF objects.\n\n\
1522 Options:\n\
1523 -d | -g | -S | --strip-debug Remove debugging symbols.\n\
1524 -h | --help Print a help message.\n\
1525 -o FILE | --output-file FILE Write output to FILE.\n\
1526 --only-keep-debug Keep debugging information only.\n\
1527 -p | --preserve-dates Preserve access and modification times.\n\
1528 -s | --strip-all Remove all symbols.\n\
1529 --strip-unneeded Remove symbols not needed for relocation\n\
1530 processing.\n\
1531 -w | --wildcard Use shell-style patterns to name symbols.\n\
1532 -x | --discard-all Discard all non-global symbols.\n\
1533 -I TGT| --input-target=TGT (Accepted, but ignored).\n\
1534 -K SYM | --keep-symbol=SYM Keep symbol 'SYM' in the output.\n\
1535 -N SYM | --strip-symbol=SYM Remove symbol 'SYM' from the output.\n\
1536 -O TGT | --output-target=TGT Set the output file format to 'TGT'.\n\
1537 -R SEC | --remove-section=SEC Remove the section named 'SEC'.\n\
1538 -V | --version Print a version identifier and exit.\n\
1539 -X | --discard-locals Remove compiler-generated local symbols.\n"
1540
1541 static void
strip_usage(void)1542 strip_usage(void)
1543 {
1544 (void) fprintf(stderr, STRIP_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1545 exit(EXIT_FAILURE);
1546 }
1547
1548 static void
print_version(void)1549 print_version(void)
1550 {
1551 (void) printf("%s (%s)\n", ELFTC_GETPROGNAME(), elftc_version());
1552 exit(EXIT_SUCCESS);
1553 }
1554
1555 /*
1556 * Compare the ending of s with end.
1557 */
1558 static int
strrcmp(const char * s,const char * end)1559 strrcmp(const char *s, const char *end)
1560 {
1561 size_t endlen, slen;
1562
1563 slen = strlen(s);
1564 endlen = strlen(end);
1565
1566 if (slen >= endlen)
1567 s += slen - endlen;
1568 return (strcmp(s, end));
1569 }
1570
1571 int
main(int argc,char ** argv)1572 main(int argc, char **argv)
1573 {
1574 struct elfcopy *ecp;
1575
1576 if (elf_version(EV_CURRENT) == EV_NONE)
1577 errx(EXIT_FAILURE, "ELF library initialization failed: %s",
1578 elf_errmsg(-1));
1579
1580 ecp = calloc(1, sizeof(*ecp));
1581 if (ecp == NULL)
1582 err(EXIT_FAILURE, "calloc failed");
1583
1584 ecp->itf = ecp->otf = ETF_ELF;
1585 ecp->iec = ecp->oec = ELFCLASSNONE;
1586 ecp->oed = ELFDATANONE;
1587 ecp->abi = -1;
1588 /* There is always an empty section. */
1589 ecp->nos = 1;
1590 ecp->fill = 0;
1591
1592 STAILQ_INIT(&ecp->v_seg);
1593 STAILQ_INIT(&ecp->v_sac);
1594 STAILQ_INIT(&ecp->v_sadd);
1595 STAILQ_INIT(&ecp->v_symop);
1596 STAILQ_INIT(&ecp->v_symfile);
1597 STAILQ_INIT(&ecp->v_arobj);
1598 TAILQ_INIT(&ecp->v_sec);
1599
1600 if ((ecp->progname = ELFTC_GETPROGNAME()) == NULL)
1601 ecp->progname = "elfcopy";
1602
1603 if (strrcmp(ecp->progname, "strip") == 0)
1604 strip_main(ecp, argc, argv);
1605 else if (strrcmp(ecp->progname, "mcs") == 0)
1606 mcs_main(ecp, argc, argv);
1607 else {
1608 if (strrcmp(ecp->progname, "elfcopy") != 0 &&
1609 strrcmp(ecp->progname, "objcopy") != 0)
1610 warnx("program mode not known, defaulting to elfcopy");
1611 elfcopy_main(ecp, argc, argv);
1612 }
1613
1614 free_sec_add(ecp);
1615 free_sec_act(ecp);
1616 free(ecp);
1617
1618 exit(EXIT_SUCCESS);
1619 }
1620