1 /* ELF attributes support (based on ARM EABI attributes).
2 Copyright 2005, 2006, 2007
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
24 #include "libiberty.h"
28 /* Return the number of bytes needed by I in uleb128 format. */
30 uleb128_size (unsigned int i)
42 /* Return TRUE if the attribute has the default value (0/""). */
44 is_default_attr (obj_attribute *attr)
46 if ((attr->type & 1) && attr->i != 0)
48 if ((attr->type & 2) && attr->s && *attr->s)
54 /* Return the size of a single attribute. */
56 obj_attr_size (int tag, obj_attribute *attr)
60 if (is_default_attr (attr))
63 size = uleb128_size (tag);
65 size += uleb128_size (attr->i);
67 size += strlen ((char *)attr->s) + 1;
71 /* Return the vendor name for a given object attributes section. */
73 vendor_obj_attr_name (bfd *abfd, int vendor)
75 return (vendor == OBJ_ATTR_PROC
76 ? get_elf_backend_data (abfd)->obj_attrs_vendor
80 /* Return the size of the object attributes section for VENDOR
81 (OBJ_ATTR_PROC or OBJ_ATTR_GNU), or 0 if there are no attributes
82 for that vendor to record and the vendor is OBJ_ATTR_GNU. */
84 vendor_obj_attr_size (bfd *abfd, int vendor)
88 obj_attribute_list *list;
90 const char *vendor_name = vendor_obj_attr_name (abfd, vendor);
95 attr = elf_known_obj_attributes (abfd)[vendor];
97 for (i = 4; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
98 size += obj_attr_size (i, &attr[i]);
100 for (list = elf_other_obj_attributes (abfd)[vendor];
103 size += obj_attr_size (list->tag, &list->attr);
105 /* <size> <vendor_name> NUL 0x1 <size> */
106 return ((size || vendor == OBJ_ATTR_PROC)
107 ? size + 10 + strlen (vendor_name)
111 /* Return the size of the object attributes section. */
113 bfd_elf_obj_attr_size (bfd *abfd)
117 size = vendor_obj_attr_size (abfd, OBJ_ATTR_PROC);
118 size += vendor_obj_attr_size (abfd, OBJ_ATTR_GNU);
120 /* 'A' <sections for each vendor> */
121 return (size ? size + 1 : 0);
124 /* Write VAL in uleb128 format to P, returning a pointer to the
127 write_uleb128 (bfd_byte *p, unsigned int val)
142 /* Write attribute ATTR to butter P, and return a pointer to the following
145 write_obj_attribute (bfd_byte *p, int tag, obj_attribute *attr)
147 /* Suppress default entries. */
148 if (is_default_attr (attr))
151 p = write_uleb128 (p, tag);
153 p = write_uleb128 (p, attr->i);
158 len = strlen (attr->s) + 1;
159 memcpy (p, attr->s, len);
166 /* Write the contents of the object attributes section (length SIZE)
167 for VENDOR to CONTENTS. */
169 vendor_set_obj_attr_contents (bfd *abfd, bfd_byte *contents, bfd_vma size,
174 obj_attribute_list *list;
176 const char *vendor_name = vendor_obj_attr_name (abfd, vendor);
177 size_t vendor_length = strlen (vendor_name) + 1;
180 bfd_put_32 (abfd, size, p);
182 memcpy (p, vendor_name, vendor_length);
185 bfd_put_32 (abfd, size - 4 - vendor_length, p);
188 attr = elf_known_obj_attributes (abfd)[vendor];
189 for (i = 4; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
190 p = write_obj_attribute (p, i, &attr[i]);
192 for (list = elf_other_obj_attributes (abfd)[vendor];
195 p = write_obj_attribute (p, list->tag, &list->attr);
198 /* Write the contents of the object attributes section to CONTENTS. */
200 bfd_elf_set_obj_attr_contents (bfd *abfd, bfd_byte *contents, bfd_vma size)
209 for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
211 bfd_vma vendor_size = vendor_obj_attr_size (abfd, vendor);
213 vendor_set_obj_attr_contents (abfd, p, vendor_size, vendor);
215 my_size += vendor_size;
222 /* Allocate/find an object attribute. */
223 static obj_attribute *
224 elf_new_obj_attr (bfd *abfd, int vendor, int tag)
227 obj_attribute_list *list;
228 obj_attribute_list *p;
229 obj_attribute_list **lastp;
232 if (tag < NUM_KNOWN_OBJ_ATTRIBUTES)
234 /* Knwon tags are preallocated. */
235 attr = &elf_known_obj_attributes (abfd)[vendor][tag];
239 /* Create a new tag. */
240 list = (obj_attribute_list *)
241 bfd_alloc (abfd, sizeof (obj_attribute_list));
242 memset (list, 0, sizeof (obj_attribute_list));
244 /* Keep the tag list in order. */
245 lastp = &elf_other_obj_attributes (abfd)[vendor];
246 for (p = *lastp; p; p = p->next)
260 /* Return the value of an integer object attribute. */
262 bfd_elf_get_obj_attr_int (bfd *abfd, int vendor, int tag)
264 obj_attribute_list *p;
266 if (tag < NUM_KNOWN_OBJ_ATTRIBUTES)
268 /* Knwon tags are preallocated. */
269 return elf_known_obj_attributes (abfd)[vendor][tag].i;
273 for (p = elf_other_obj_attributes (abfd)[vendor];
286 /* Add an integer object attribute. */
288 bfd_elf_add_obj_attr_int (bfd *abfd, int vendor, int tag, unsigned int i)
292 attr = elf_new_obj_attr (abfd, vendor, tag);
297 /* Duplicate an object attribute string value. */
299 _bfd_elf_attr_strdup (bfd *abfd, const char * s)
304 len = strlen (s) + 1;
305 p = (char *) bfd_alloc (abfd, len);
306 return memcpy (p, s, len);
309 /* Add a string object attribute. */
311 bfd_elf_add_obj_attr_string (bfd *abfd, int vendor, int tag, const char *s)
315 attr = elf_new_obj_attr (abfd, vendor, tag);
317 attr->s = _bfd_elf_attr_strdup (abfd, s);
320 /* Add a int+string object attribute. */
322 bfd_elf_add_obj_attr_int_string (bfd *abfd, int vendor, int tag,
323 unsigned int i, const char *s)
327 attr = elf_new_obj_attr (abfd, vendor, tag);
330 attr->s = _bfd_elf_attr_strdup (abfd, s);
333 /* Copy the object attributes from IBFD to OBFD. */
335 _bfd_elf_copy_obj_attributes (bfd *ibfd, bfd *obfd)
337 obj_attribute *in_attr;
338 obj_attribute *out_attr;
339 obj_attribute_list *list;
343 for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
345 in_attr = &elf_known_obj_attributes (ibfd)[vendor][4];
346 out_attr = &elf_known_obj_attributes (obfd)[vendor][4];
347 for (i = 4; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
349 out_attr->type = in_attr->type;
350 out_attr->i = in_attr->i;
351 if (in_attr->s && *in_attr->s)
352 out_attr->s = _bfd_elf_attr_strdup (obfd, in_attr->s);
357 for (list = elf_other_obj_attributes (ibfd)[vendor];
361 in_attr = &list->attr;
362 switch (in_attr->type)
365 bfd_elf_add_obj_attr_int (obfd, vendor, list->tag, in_attr->i);
368 bfd_elf_add_obj_attr_string (obfd, vendor, list->tag,
372 bfd_elf_add_obj_attr_int_string (obfd, vendor, list->tag,
373 in_attr->i, in_attr->s);
382 /* Determine whether a GNU object attribute tag takes an integer, a
385 gnu_obj_attrs_arg_type (int tag)
387 /* Except for Tag_compatibility, for GNU attributes we follow the
388 same rule ARM ones > 32 follow: odd-numbered tags take strings
389 and even-numbered tags take integers. In addition, tag & 2 is
390 nonzero for architecture-independent tags and zero for
391 architecture-dependent ones. */
392 if (tag == Tag_compatibility)
395 return (tag & 1) != 0 ? 2 : 1;
398 /* Determine what arguments an attribute tag takes. */
400 _bfd_elf_obj_attrs_arg_type (bfd *abfd, int vendor, int tag)
405 return get_elf_backend_data (abfd)->obj_attrs_arg_type (tag);
408 return gnu_obj_attrs_arg_type (tag);
415 /* Parse an object attributes section. */
417 _bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr)
422 const char *std_section;
424 contents = bfd_malloc (hdr->sh_size);
427 if (!bfd_get_section_contents (abfd, hdr->bfd_section, contents, 0,
434 std_section = get_elf_backend_data (abfd)->obj_attrs_vendor;
437 len = hdr->sh_size - 1;
444 section_len = bfd_get_32 (abfd, p);
446 if (section_len > len)
449 namelen = strlen ((char *)p) + 1;
450 section_len -= namelen + 4;
451 if (std_section && strcmp ((char *)p, std_section) == 0)
452 vendor = OBJ_ATTR_PROC;
453 else if (strcmp ((char *)p, "gnu") == 0)
454 vendor = OBJ_ATTR_GNU;
457 /* Other vendor section. Ignore it. */
458 p += namelen + section_len;
463 while (section_len > 0)
468 bfd_vma subsection_len;
471 tag = read_unsigned_leb128 (abfd, p, &n);
473 subsection_len = bfd_get_32 (abfd, p);
475 if (subsection_len > section_len)
476 subsection_len = section_len;
477 section_len -= subsection_len;
478 subsection_len -= n + 4;
479 end = p + subsection_len;
487 tag = read_unsigned_leb128 (abfd, p, &n);
489 type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag);
493 val = read_unsigned_leb128 (abfd, p, &n);
495 bfd_elf_add_obj_attr_int_string (abfd, vendor, tag,
497 p += strlen ((char *)p) + 1;
500 bfd_elf_add_obj_attr_string (abfd, vendor, tag,
502 p += strlen ((char *)p) + 1;
505 val = read_unsigned_leb128 (abfd, p, &n);
507 bfd_elf_add_obj_attr_int (abfd, vendor, tag, val);
516 /* Don't have anywhere convenient to attach these.
517 Fall through for now. */
519 /* Ignore things we don't kow about. */
530 /* Merge common object attributes from IBFD into OBFD. Raise an error
531 if there are conflicting attributes. Any processor-specific
532 attributes have already been merged. This must be called from the
533 bfd_elfNN_bfd_merge_private_bfd_data hook for each individual
534 target, along with any target-specific merging. Because there are
535 no common attributes other than Tag_compatibility at present, and
536 non-"gnu" Tag_compatibility is not expected in "gnu" sections, this
537 is not presently called for targets without their own
541 _bfd_elf_merge_object_attributes (bfd *ibfd, bfd *obfd)
543 obj_attribute *in_attr;
544 obj_attribute *out_attr;
547 /* The only common attribute is currently Tag_compatibility,
548 accepted in both processor and "gnu" sections. */
549 for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
551 /* Handle Tag_compatibility. The tags are only compatible if the flags
552 are identical and, if the flags are '1', the strings are identical.
553 If the flags are non-zero, then we can only use the string "gnu". */
554 in_attr = &elf_known_obj_attributes (ibfd)[vendor][Tag_compatibility];
555 out_attr = &elf_known_obj_attributes (obfd)[vendor][Tag_compatibility];
557 if (in_attr->i > 0 && strcmp (in_attr->s, "gnu") != 0)
560 (_("ERROR: %B: Must be processed by '%s' toolchain"),
565 if (in_attr->i != out_attr->i
566 || (in_attr->i != 0 && strcmp (in_attr->s, out_attr->s) != 0))
568 _bfd_error_handler (_("ERROR: %B: Object tag '%d, %s' is "
569 "incompatible with tag '%d, %s'"),
571 in_attr->i, in_attr->s ? in_attr->s : "",
572 out_attr->i, out_attr->s ? out_attr->s : "");