1 /* elfcomm.c -- common code for ELF format file.
2 Copyright (C) 2010-2016 Free Software Foundation, Inc.
4 Originally developed by Eric Youngdale <eric@andante.jic.com>
5 Modifications by Nick Clifton <nickc@redhat.com>
7 This file is part of GNU Binutils.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
25 #include "libiberty.h"
26 #include "filenames.h"
34 error (const char *message, ...)
38 /* Try to keep error messages in sync with the program's normal output. */
41 va_start (args, message);
42 fprintf (stderr, _("%s: Error: "), program_name);
43 vfprintf (stderr, message, args);
48 warn (const char *message, ...)
52 /* Try to keep warning messages in sync with the program's normal output. */
55 va_start (args, message);
56 fprintf (stderr, _("%s: Warning: "), program_name);
57 vfprintf (stderr, message, args);
61 void (*byte_put) (unsigned char *, elf_vma, int);
64 byte_put_little_endian (unsigned char * field, elf_vma value, int size)
69 field[7] = (((value >> 24) >> 24) >> 8) & 0xff;
70 field[6] = ((value >> 24) >> 24) & 0xff;
71 field[5] = ((value >> 24) >> 16) & 0xff;
72 field[4] = ((value >> 24) >> 8) & 0xff;
75 field[3] = (value >> 24) & 0xff;
78 field[2] = (value >> 16) & 0xff;
81 field[1] = (value >> 8) & 0xff;
84 field[0] = value & 0xff;
88 error (_("Unhandled data length: %d\n"), size);
94 byte_put_big_endian (unsigned char * field, elf_vma value, int size)
99 field[7] = value & 0xff;
100 field[6] = (value >> 8) & 0xff;
101 field[5] = (value >> 16) & 0xff;
102 field[4] = (value >> 24) & 0xff;
107 field[3] = value & 0xff;
111 field[2] = value & 0xff;
115 field[1] = value & 0xff;
119 field[0] = value & 0xff;
123 error (_("Unhandled data length: %d\n"), size);
128 elf_vma (*byte_get) (unsigned char *, int);
131 byte_get_little_endian (unsigned char *field, int size)
139 return ((unsigned int) (field[0]))
140 | (((unsigned int) (field[1])) << 8);
143 return ((unsigned long) (field[0]))
144 | (((unsigned long) (field[1])) << 8)
145 | (((unsigned long) (field[2])) << 16);
148 return ((unsigned long) (field[0]))
149 | (((unsigned long) (field[1])) << 8)
150 | (((unsigned long) (field[2])) << 16)
151 | (((unsigned long) (field[3])) << 24);
154 if (sizeof (elf_vma) == 8)
155 return ((elf_vma) (field[0]))
156 | (((elf_vma) (field[1])) << 8)
157 | (((elf_vma) (field[2])) << 16)
158 | (((elf_vma) (field[3])) << 24)
159 | (((elf_vma) (field[4])) << 32);
160 else if (sizeof (elf_vma) == 4)
161 /* We want to extract data from an 8 byte wide field and
162 place it into a 4 byte wide field. Since this is a little
163 endian source we can just use the 4 byte extraction code. */
164 return ((unsigned long) (field[0]))
165 | (((unsigned long) (field[1])) << 8)
166 | (((unsigned long) (field[2])) << 16)
167 | (((unsigned long) (field[3])) << 24);
171 if (sizeof (elf_vma) == 8)
172 return ((elf_vma) (field[0]))
173 | (((elf_vma) (field[1])) << 8)
174 | (((elf_vma) (field[2])) << 16)
175 | (((elf_vma) (field[3])) << 24)
176 | (((elf_vma) (field[4])) << 32)
177 | (((elf_vma) (field[5])) << 40);
178 else if (sizeof (elf_vma) == 4)
179 /* We want to extract data from an 8 byte wide field and
180 place it into a 4 byte wide field. Since this is a little
181 endian source we can just use the 4 byte extraction code. */
182 return ((unsigned long) (field[0]))
183 | (((unsigned long) (field[1])) << 8)
184 | (((unsigned long) (field[2])) << 16)
185 | (((unsigned long) (field[3])) << 24);
189 if (sizeof (elf_vma) == 8)
190 return ((elf_vma) (field[0]))
191 | (((elf_vma) (field[1])) << 8)
192 | (((elf_vma) (field[2])) << 16)
193 | (((elf_vma) (field[3])) << 24)
194 | (((elf_vma) (field[4])) << 32)
195 | (((elf_vma) (field[5])) << 40)
196 | (((elf_vma) (field[6])) << 48);
197 else if (sizeof (elf_vma) == 4)
198 /* We want to extract data from an 8 byte wide field and
199 place it into a 4 byte wide field. Since this is a little
200 endian source we can just use the 4 byte extraction code. */
201 return ((unsigned long) (field[0]))
202 | (((unsigned long) (field[1])) << 8)
203 | (((unsigned long) (field[2])) << 16)
204 | (((unsigned long) (field[3])) << 24);
208 if (sizeof (elf_vma) == 8)
209 return ((elf_vma) (field[0]))
210 | (((elf_vma) (field[1])) << 8)
211 | (((elf_vma) (field[2])) << 16)
212 | (((elf_vma) (field[3])) << 24)
213 | (((elf_vma) (field[4])) << 32)
214 | (((elf_vma) (field[5])) << 40)
215 | (((elf_vma) (field[6])) << 48)
216 | (((elf_vma) (field[7])) << 56);
217 else if (sizeof (elf_vma) == 4)
218 /* We want to extract data from an 8 byte wide field and
219 place it into a 4 byte wide field. Since this is a little
220 endian source we can just use the 4 byte extraction code. */
221 return ((unsigned long) (field[0]))
222 | (((unsigned long) (field[1])) << 8)
223 | (((unsigned long) (field[2])) << 16)
224 | (((unsigned long) (field[3])) << 24);
228 error (_("Unhandled data length: %d\n"), size);
234 byte_get_big_endian (unsigned char *field, int size)
242 return ((unsigned int) (field[1])) | (((int) (field[0])) << 8);
245 return ((unsigned long) (field[2]))
246 | (((unsigned long) (field[1])) << 8)
247 | (((unsigned long) (field[0])) << 16);
250 return ((unsigned long) (field[3]))
251 | (((unsigned long) (field[2])) << 8)
252 | (((unsigned long) (field[1])) << 16)
253 | (((unsigned long) (field[0])) << 24);
256 if (sizeof (elf_vma) == 8)
257 return ((elf_vma) (field[4]))
258 | (((elf_vma) (field[3])) << 8)
259 | (((elf_vma) (field[2])) << 16)
260 | (((elf_vma) (field[1])) << 24)
261 | (((elf_vma) (field[0])) << 32);
262 else if (sizeof (elf_vma) == 4)
264 /* Although we are extracting data from an 8 byte wide field,
265 we are returning only 4 bytes of data. */
267 return ((unsigned long) (field[3]))
268 | (((unsigned long) (field[2])) << 8)
269 | (((unsigned long) (field[1])) << 16)
270 | (((unsigned long) (field[0])) << 24);
275 if (sizeof (elf_vma) == 8)
276 return ((elf_vma) (field[5]))
277 | (((elf_vma) (field[4])) << 8)
278 | (((elf_vma) (field[3])) << 16)
279 | (((elf_vma) (field[2])) << 24)
280 | (((elf_vma) (field[1])) << 32)
281 | (((elf_vma) (field[0])) << 40);
282 else if (sizeof (elf_vma) == 4)
284 /* Although we are extracting data from an 8 byte wide field,
285 we are returning only 4 bytes of data. */
287 return ((unsigned long) (field[3]))
288 | (((unsigned long) (field[2])) << 8)
289 | (((unsigned long) (field[1])) << 16)
290 | (((unsigned long) (field[0])) << 24);
295 if (sizeof (elf_vma) == 8)
296 return ((elf_vma) (field[6]))
297 | (((elf_vma) (field[5])) << 8)
298 | (((elf_vma) (field[4])) << 16)
299 | (((elf_vma) (field[3])) << 24)
300 | (((elf_vma) (field[2])) << 32)
301 | (((elf_vma) (field[1])) << 40)
302 | (((elf_vma) (field[0])) << 48);
303 else if (sizeof (elf_vma) == 4)
305 /* Although we are extracting data from an 8 byte wide field,
306 we are returning only 4 bytes of data. */
308 return ((unsigned long) (field[3]))
309 | (((unsigned long) (field[2])) << 8)
310 | (((unsigned long) (field[1])) << 16)
311 | (((unsigned long) (field[0])) << 24);
316 if (sizeof (elf_vma) == 8)
317 return ((elf_vma) (field[7]))
318 | (((elf_vma) (field[6])) << 8)
319 | (((elf_vma) (field[5])) << 16)
320 | (((elf_vma) (field[4])) << 24)
321 | (((elf_vma) (field[3])) << 32)
322 | (((elf_vma) (field[2])) << 40)
323 | (((elf_vma) (field[1])) << 48)
324 | (((elf_vma) (field[0])) << 56);
325 else if (sizeof (elf_vma) == 4)
327 /* Although we are extracting data from an 8 byte wide field,
328 we are returning only 4 bytes of data. */
330 return ((unsigned long) (field[3]))
331 | (((unsigned long) (field[2])) << 8)
332 | (((unsigned long) (field[1])) << 16)
333 | (((unsigned long) (field[0])) << 24);
338 error (_("Unhandled data length: %d\n"), size);
344 byte_get_signed (unsigned char *field, int size)
346 elf_vma x = byte_get (field, size);
351 return (x ^ 0x80) - 0x80;
353 return (x ^ 0x8000) - 0x8000;
355 return (x ^ 0x800000) - 0x800000;
357 return (x ^ 0x80000000) - 0x80000000;
362 /* Reads of 5-, 6-, and 7-byte numbers are the result of
363 trying to read past the end of a buffer, and will therefore
364 not have meaningful values, so we don't try to deal with
365 the sign in these cases. */
372 /* Return the high-order 32-bits and the low-order 32-bits
373 of an 8-byte value separately. */
376 byte_get_64 (unsigned char *field, elf_vma *high, elf_vma *low)
378 if (byte_get == byte_get_big_endian)
380 *high = byte_get_big_endian (field, 4);
381 *low = byte_get_big_endian (field + 4, 4);
385 *high = byte_get_little_endian (field + 4, 4);
386 *low = byte_get_little_endian (field, 4);
391 /* Return the path name for a proxy entry in a thin archive, adjusted
392 relative to the path name of the thin archive itself if necessary.
393 Always returns a pointer to malloc'ed memory. */
396 adjust_relative_path (const char *file_name, const char *name,
397 unsigned long name_len)
399 char * member_file_name;
400 const char * base_name = lbasename (file_name);
403 /* This is a proxy entry for a thin archive member.
404 If the extended name table contains an absolute path
405 name, or if the archive is in the current directory,
406 use the path name as given. Otherwise, we need to
407 find the member relative to the directory where the
408 archive is located. */
409 if (IS_ABSOLUTE_PATH (name) || base_name == file_name)
414 member_file_name = (char *) malloc (amt);
415 if (member_file_name == NULL)
417 error (_("Out of memory\n"));
420 memcpy (member_file_name, name, name_len);
421 member_file_name[name_len] = '\0';
425 /* Concatenate the path components of the archive file name
426 to the relative path name from the extended name table. */
427 size_t prefix_len = base_name - file_name;
429 amt = prefix_len + name_len + 1;
430 /* PR 17531: file: 2896dc8b
432 if (amt < prefix_len || amt < name_len)
434 error (_("Abnormal length of thin archive member name: %lx\n"),
439 member_file_name = (char *) malloc (amt);
440 if (member_file_name == NULL)
442 error (_("Out of memory\n"));
445 memcpy (member_file_name, file_name, prefix_len);
446 memcpy (member_file_name + prefix_len, name, name_len);
447 member_file_name[prefix_len + name_len] = '\0';
449 return member_file_name;
452 /* Processes the archive index table and symbol table in ARCH.
453 Entries in the index table are SIZEOF_AR_INDEX bytes long.
454 Fills in ARCH->next_arhdr_offset and ARCH->arhdr.
455 If READ_SYMBOLS is true then fills in ARCH->index_num, ARCH->index_array,
456 ARCH->sym_size and ARCH->sym_table.
457 It is the caller's responsibility to free ARCH->index_array and
459 Returns TRUE upon success, FALSE otherwise.
460 If failure occurs an error message is printed. */
463 process_archive_index_and_symbols (struct archive_info * arch,
464 unsigned int sizeof_ar_index,
465 bfd_boolean read_symbols)
470 size = strtoul (arch->arhdr.ar_size, NULL, 10);
471 /* PR 17531: file: 912bd7de. */
472 if ((signed long) size < 0)
474 error (_("%s: invalid archive header size: %ld\n"),
475 arch->file_name, size);
479 size = size + (size & 1);
481 arch->next_arhdr_offset += sizeof arch->arhdr + size;
485 if (fseek (arch->file, size, SEEK_CUR) != 0)
487 error (_("%s: failed to skip archive symbol table\n"),
495 /* A buffer used to hold numbers read in from an archive index.
496 These are always SIZEOF_AR_INDEX bytes long and stored in
497 big-endian format. */
498 unsigned char integer_buffer[sizeof arch->index_num];
499 unsigned char * index_buffer;
501 assert (sizeof_ar_index <= sizeof integer_buffer);
503 /* Check the size of the archive index. */
504 if (size < sizeof_ar_index)
506 error (_("%s: the archive index is empty\n"), arch->file_name);
510 /* Read the number of entries in the archive index. */
511 got = fread (integer_buffer, 1, sizeof_ar_index, arch->file);
512 if (got != sizeof_ar_index)
514 error (_("%s: failed to read archive index\n"), arch->file_name);
518 arch->index_num = byte_get_big_endian (integer_buffer, sizeof_ar_index);
519 size -= sizeof_ar_index;
521 if (size < arch->index_num * sizeof_ar_index
522 /* PR 17531: file: 585515d1. */
523 || size < arch->index_num)
525 error (_("%s: the archive index is supposed to have 0x%lx entries of %d bytes, but the size is only 0x%lx\n"),
526 arch->file_name, (long) arch->index_num, sizeof_ar_index, size);
530 /* Read in the archive index. */
531 index_buffer = (unsigned char *)
532 malloc (arch->index_num * sizeof_ar_index);
533 if (index_buffer == NULL)
535 error (_("Out of memory whilst trying to read archive symbol index\n"));
539 got = fread (index_buffer, sizeof_ar_index, arch->index_num, arch->file);
540 if (got != arch->index_num)
543 error (_("%s: failed to read archive index\n"), arch->file_name);
547 size -= arch->index_num * sizeof_ar_index;
549 /* Convert the index numbers into the host's numeric format. */
550 arch->index_array = (elf_vma *)
551 malloc (arch->index_num * sizeof (* arch->index_array));
552 if (arch->index_array == NULL)
555 error (_("Out of memory whilst trying to convert the archive symbol index\n"));
559 for (i = 0; i < arch->index_num; i++)
560 arch->index_array[i] =
561 byte_get_big_endian ((unsigned char *) (index_buffer + (i * sizeof_ar_index)),
565 /* The remaining space in the header is taken up by the symbol table. */
568 error (_("%s: the archive has an index but no symbols\n"),
573 arch->sym_table = (char *) malloc (size);
574 if (arch->sym_table == NULL)
576 error (_("Out of memory whilst trying to read archive index symbol table\n"));
580 arch->sym_size = size;
581 got = fread (arch->sym_table, 1, size, arch->file);
584 error (_("%s: failed to read archive index symbol table\n"),
590 /* Read the next archive header. */
591 got = fread (&arch->arhdr, 1, sizeof arch->arhdr, arch->file);
592 if (got != sizeof arch->arhdr && got != 0)
594 error (_("%s: failed to read archive header following archive index\n"),
602 /* Read the symbol table and long-name table from an archive. */
605 setup_archive (struct archive_info *arch, const char *file_name,
606 FILE *file, bfd_boolean is_thin_archive,
607 bfd_boolean read_symbols)
611 arch->file_name = strdup (file_name);
614 arch->index_array = NULL;
615 arch->sym_table = NULL;
617 arch->longnames = NULL;
618 arch->longnames_size = 0;
619 arch->nested_member_origin = 0;
620 arch->is_thin_archive = is_thin_archive;
621 arch->uses_64bit_indicies = FALSE;
622 arch->next_arhdr_offset = SARMAG;
624 /* Read the first archive member header. */
625 if (fseek (file, SARMAG, SEEK_SET) != 0)
627 error (_("%s: failed to seek to first archive header\n"), file_name);
630 got = fread (&arch->arhdr, 1, sizeof arch->arhdr, file);
631 if (got != sizeof arch->arhdr)
636 error (_("%s: failed to read archive header\n"), file_name);
640 /* See if this is the archive symbol table. */
641 if (const_strneq (arch->arhdr.ar_name, "/ "))
643 if (! process_archive_index_and_symbols (arch, 4, read_symbols))
646 else if (const_strneq (arch->arhdr.ar_name, "/SYM64/ "))
648 arch->uses_64bit_indicies = TRUE;
649 if (! process_archive_index_and_symbols (arch, 8, read_symbols))
652 else if (read_symbols)
653 printf (_("%s has no archive index\n"), file_name);
655 if (const_strneq (arch->arhdr.ar_name, "// "))
657 /* This is the archive string table holding long member names. */
658 arch->longnames_size = strtoul (arch->arhdr.ar_size, NULL, 10);
659 /* PR 17531: file: 01068045. */
660 if (arch->longnames_size < 8)
662 error (_("%s: long name table is too small, (size = %ld)\n"),
663 file_name, arch->longnames_size);
666 /* PR 17531: file: 639d6a26. */
667 if ((signed long) arch->longnames_size < 0)
669 error (_("%s: long name table is too big, (size = 0x%lx)\n"),
670 file_name, arch->longnames_size);
674 arch->next_arhdr_offset += sizeof arch->arhdr + arch->longnames_size;
676 /* Plus one to allow for a string terminator. */
677 arch->longnames = (char *) malloc (arch->longnames_size + 1);
678 if (arch->longnames == NULL)
680 error (_("Out of memory reading long symbol names in archive\n"));
684 if (fread (arch->longnames, arch->longnames_size, 1, file) != 1)
686 free (arch->longnames);
687 arch->longnames = NULL;
688 error (_("%s: failed to read long symbol name string table\n"),
693 if ((arch->longnames_size & 1) != 0)
696 arch->longnames[arch->longnames_size] = 0;
702 /* Open and setup a nested archive, if not already open. */
705 setup_nested_archive (struct archive_info *nested_arch,
706 const char *member_file_name)
710 /* Have we already setup this archive? */
711 if (nested_arch->file_name != NULL
712 && streq (nested_arch->file_name, member_file_name))
715 /* Close previous file and discard cached information. */
716 if (nested_arch->file != NULL)
717 fclose (nested_arch->file);
718 release_archive (nested_arch);
720 member_file = fopen (member_file_name, "rb");
721 if (member_file == NULL)
723 return setup_archive (nested_arch, member_file_name, member_file,
727 /* Release the memory used for the archive information. */
730 release_archive (struct archive_info * arch)
732 if (arch->file_name != NULL)
733 free (arch->file_name);
734 if (arch->index_array != NULL)
735 free (arch->index_array);
736 if (arch->sym_table != NULL)
737 free (arch->sym_table);
738 if (arch->longnames != NULL)
739 free (arch->longnames);
742 /* Get the name of an archive member from the current archive header.
743 For simple names, this will modify the ar_name field of the current
744 archive header. For long names, it will return a pointer to the
745 longnames table. For nested archives, it will open the nested archive
746 and get the name recursively. NESTED_ARCH is a single-entry cache so
747 we don't keep rereading the same information from a nested archive. */
750 get_archive_member_name (struct archive_info *arch,
751 struct archive_info *nested_arch)
755 if (arch->arhdr.ar_name[0] == '/')
757 /* We have a long name. */
759 char *member_file_name;
762 if (arch->longnames == NULL || arch->longnames_size == 0)
764 error (_("Archive member uses long names, but no longname table found\n"));
768 arch->nested_member_origin = 0;
769 k = j = strtoul (arch->arhdr.ar_name + 1, &endp, 10);
770 if (arch->is_thin_archive && endp != NULL && * endp == ':')
771 arch->nested_member_origin = strtoul (endp + 1, NULL, 10);
773 if (j > arch->longnames_size)
775 error (_("Found long name index (%ld) beyond end of long name table\n"),j);
778 while ((j < arch->longnames_size)
779 && (arch->longnames[j] != '\n')
780 && (arch->longnames[j] != '\0'))
782 if (j > 0 && arch->longnames[j-1] == '/')
784 if (j > arch->longnames_size)
785 j = arch->longnames_size;
786 arch->longnames[j] = '\0';
788 if (!arch->is_thin_archive || arch->nested_member_origin == 0)
789 return arch->longnames + k;
791 /* PR 17531: file: 2896dc8b. */
794 error (_("Invalid Thin archive member name\n"));
798 /* This is a proxy for a member of a nested archive.
799 Find the name of the member in that archive. */
800 member_file_name = adjust_relative_path (arch->file_name,
801 arch->longnames + k, j - k);
802 if (member_file_name != NULL
803 && setup_nested_archive (nested_arch, member_file_name) == 0)
805 member_name = get_archive_member_name_at (nested_arch,
806 arch->nested_member_origin,
808 if (member_name != NULL)
810 free (member_file_name);
814 free (member_file_name);
816 /* Last resort: just return the name of the nested archive. */
817 return arch->longnames + k;
820 /* We have a normal (short) name. */
821 for (j = 0; j < sizeof (arch->arhdr.ar_name); j++)
822 if (arch->arhdr.ar_name[j] == '/')
824 arch->arhdr.ar_name[j] = '\0';
825 return arch->arhdr.ar_name;
828 /* The full ar_name field is used. Don't rely on ar_date starting
831 char *name = xmalloc (sizeof (arch->arhdr.ar_name) + 1);
832 memcpy (name, arch->arhdr.ar_name, sizeof (arch->arhdr.ar_name));
833 name[sizeof (arch->arhdr.ar_name)] = '\0';
838 /* Get the name of an archive member at a given OFFSET within an archive
842 get_archive_member_name_at (struct archive_info *arch,
843 unsigned long offset,
844 struct archive_info *nested_arch)
848 if (fseek (arch->file, offset, SEEK_SET) != 0)
850 error (_("%s: failed to seek to next file name\n"), arch->file_name);
853 got = fread (&arch->arhdr, 1, sizeof arch->arhdr, arch->file);
854 if (got != sizeof arch->arhdr)
856 error (_("%s: failed to read archive header\n"), arch->file_name);
859 if (memcmp (arch->arhdr.ar_fmag, ARFMAG, 2) != 0)
861 error (_("%s: did not find a valid archive header\n"),
866 return get_archive_member_name (arch, nested_arch);
869 /* Construct a string showing the name of the archive member, qualified
870 with the name of the containing archive file. For thin archives, we
871 use square brackets to denote the indirection. For nested archives,
872 we show the qualified name of the external member inside the square
873 brackets (e.g., "thin.a[normal.a(foo.o)]"). */
876 make_qualified_name (struct archive_info * arch,
877 struct archive_info * nested_arch,
878 const char *member_name)
880 const char * error_name = _("<corrupt>");
884 len = strlen (arch->file_name) + strlen (member_name) + 3;
885 if (arch->is_thin_archive
886 && arch->nested_member_origin != 0)
888 /* PR 15140: Allow for corrupt thin archives. */
889 if (nested_arch->file_name)
890 len += strlen (nested_arch->file_name) + 2;
892 len += strlen (error_name) + 2;
895 name = (char *) malloc (len);
898 error (_("Out of memory\n"));
902 if (arch->is_thin_archive
903 && arch->nested_member_origin != 0)
905 if (nested_arch->file_name)
906 snprintf (name, len, "%s[%s(%s)]", arch->file_name,
907 nested_arch->file_name, member_name);
909 snprintf (name, len, "%s[%s(%s)]", arch->file_name,
910 error_name, member_name);
912 else if (arch->is_thin_archive)
913 snprintf (name, len, "%s[%s]", arch->file_name, member_name);
915 snprintf (name, len, "%s(%s)", arch->file_name, member_name);