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 Tag_compatibility object attribute. */
322 bfd_elf_add_obj_attr_compat (bfd *abfd, int vendor, unsigned int i,
325 obj_attribute_list *list;
326 obj_attribute_list *p;
327 obj_attribute_list **lastp;
329 list = (obj_attribute_list *)
330 bfd_alloc (abfd, sizeof (obj_attribute_list));
331 memset (list, 0, sizeof (obj_attribute_list));
332 list->tag = Tag_compatibility;
335 list->attr.s = _bfd_elf_attr_strdup (abfd, s);
337 lastp = &elf_other_obj_attributes (abfd)[vendor];
338 for (p = *lastp; p; p = p->next)
341 if (p->tag != Tag_compatibility)
343 cmp = strcmp(s, p->attr.s);
344 if (cmp < 0 || (cmp == 0 && i < p->attr.i))
352 /* Copy the object attributes from IBFD to OBFD. */
354 _bfd_elf_copy_obj_attributes (bfd *ibfd, bfd *obfd)
356 obj_attribute *in_attr;
357 obj_attribute *out_attr;
358 obj_attribute_list *list;
362 for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
364 in_attr = &elf_known_obj_attributes (ibfd)[vendor][4];
365 out_attr = &elf_known_obj_attributes (obfd)[vendor][4];
366 for (i = 4; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
368 out_attr->type = in_attr->type;
369 out_attr->i = in_attr->i;
370 if (in_attr->s && *in_attr->s)
371 out_attr->s = _bfd_elf_attr_strdup (obfd, in_attr->s);
376 for (list = elf_other_obj_attributes (ibfd)[vendor];
380 in_attr = &list->attr;
381 switch (in_attr->type)
384 bfd_elf_add_obj_attr_int (obfd, vendor, list->tag, in_attr->i);
387 bfd_elf_add_obj_attr_string (obfd, vendor, list->tag,
391 bfd_elf_add_obj_attr_compat (obfd, vendor, in_attr->i,
401 /* Determine whether a GNU object attribute tag takes an integer, a
404 gnu_obj_attrs_arg_type (int tag)
406 /* Except for Tag_compatibility, for GNU attributes we follow the
407 same rule ARM ones > 32 follow: odd-numbered tags take strings
408 and even-numbered tags take integers. In addition, tag & 2 is
409 nonzero for architecture-independent tags and zero for
410 architecture-dependent ones. */
411 if (tag == Tag_compatibility)
414 return (tag & 1) != 0 ? 2 : 1;
417 /* Determine what arguments an attribute tag takes. */
419 _bfd_elf_obj_attrs_arg_type (bfd *abfd, int vendor, int tag)
424 return get_elf_backend_data (abfd)->obj_attrs_arg_type (tag);
427 return gnu_obj_attrs_arg_type (tag);
434 /* Parse an object attributes section. */
436 _bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr)
441 const char *std_section;
443 contents = bfd_malloc (hdr->sh_size);
446 if (!bfd_get_section_contents (abfd, hdr->bfd_section, contents, 0,
453 std_section = get_elf_backend_data (abfd)->obj_attrs_vendor;
456 len = hdr->sh_size - 1;
463 section_len = bfd_get_32 (abfd, p);
465 if (section_len > len)
468 namelen = strlen ((char *)p) + 1;
469 section_len -= namelen + 4;
470 if (std_section && strcmp ((char *)p, std_section) == 0)
471 vendor = OBJ_ATTR_PROC;
472 else if (strcmp ((char *)p, "gnu") == 0)
473 vendor = OBJ_ATTR_GNU;
476 /* Other vendor section. Ignore it. */
477 p += namelen + section_len;
482 while (section_len > 0)
487 bfd_vma subsection_len;
490 tag = read_unsigned_leb128 (abfd, p, &n);
492 subsection_len = bfd_get_32 (abfd, p);
494 if (subsection_len > section_len)
495 subsection_len = section_len;
496 section_len -= subsection_len;
497 subsection_len -= n + 4;
498 end = p + subsection_len;
506 tag = read_unsigned_leb128 (abfd, p, &n);
508 type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag);
512 val = read_unsigned_leb128 (abfd, p, &n);
514 bfd_elf_add_obj_attr_compat (abfd, vendor, val,
516 p += strlen ((char *)p) + 1;
519 bfd_elf_add_obj_attr_string (abfd, vendor, tag,
521 p += strlen ((char *)p) + 1;
524 val = read_unsigned_leb128 (abfd, p, &n);
526 bfd_elf_add_obj_attr_int (abfd, vendor, tag, val);
535 /* Don't have anywhere convenient to attach these.
536 Fall through for now. */
538 /* Ignore things we don't kow about. */
549 /* Merge common object attributes from IBFD into OBFD. Raise an error
550 if there are conflicting attributes. Any processor-specific
551 attributes have already been merged. This must be called from the
552 bfd_elfNN_bfd_merge_private_bfd_data hook for each individual
553 target, along with any target-specific merging. Because there are
554 no common attributes other than Tag_compatibility at present, and
555 non-"gnu" Tag_compatibility is not expected in "gnu" sections, this
556 is not presently called for targets without their own
560 _bfd_elf_merge_object_attributes (bfd *ibfd, bfd *obfd)
562 obj_attribute *in_attr;
563 obj_attribute *out_attr;
564 obj_attribute_list *in_list;
565 obj_attribute_list *out_list;
568 /* The only common attribute is currently Tag_compatibility,
569 accepted in both processor and "gnu" sections. */
570 for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
572 in_list = elf_other_obj_attributes (ibfd)[vendor];
573 out_list = elf_other_obj_attributes (ibfd)[vendor];
574 while (in_list && in_list->tag == Tag_compatibility)
576 in_attr = &in_list->attr;
579 if (in_attr->i == 1 && strcmp (in_attr->s, "gnu") != 0)
582 (_("ERROR: %B: Must be processed by '%s' toolchain"),
586 if (!out_list || out_list->tag != Tag_compatibility
587 || strcmp (in_attr->s, out_list->attr.s) != 0)
589 /* Add this compatibility tag to the output. */
590 bfd_elf_add_proc_attr_compat (obfd, in_attr->i, in_attr->s);
593 out_attr = &out_list->attr;
594 /* Check all the input tags with the same identifier. */
597 if (out_list->tag != Tag_compatibility
598 || in_attr->i != out_attr->i
599 || strcmp (in_attr->s, out_attr->s) != 0)
602 (_("ERROR: %B: Incompatible object tag '%s':%d"),
603 ibfd, in_attr->s, in_attr->i);
606 in_list = in_list->next;
607 if (in_list->tag != Tag_compatibility
608 || strcmp (in_attr->s, in_list->attr.s) != 0)
610 in_attr = &in_list->attr;
611 out_list = out_list->next;
613 out_attr = &out_list->attr;
616 /* Check the output doesn't have extra tags with this identifier. */
617 if (out_list && out_list->tag == Tag_compatibility
618 && strcmp (in_attr->s, out_list->attr.s) == 0)
621 (_("ERROR: %B: Incompatible object tag '%s':%d"),
622 ibfd, in_attr->s, out_list->attr.i);