dc2605669d45a455824503acb0737161662fa25b
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
)
56 /* Return the size of a single attribute. */
58 obj_attr_size (int tag
, obj_attribute
*attr
)
62 if (is_default_attr (attr
))
65 size
= uleb128_size (tag
);
67 size
+= uleb128_size (attr
->i
);
69 size
+= strlen ((char *)attr
->s
) + 1;
73 /* Return the vendor name for a given object attributes section. */
75 vendor_obj_attr_name (bfd
*abfd
, int vendor
)
77 return (vendor
== OBJ_ATTR_PROC
78 ? get_elf_backend_data (abfd
)->obj_attrs_vendor
82 /* Return the size of the object attributes section for VENDOR
83 (OBJ_ATTR_PROC or OBJ_ATTR_GNU), or 0 if there are no attributes
84 for that vendor to record and the vendor is OBJ_ATTR_GNU. */
86 vendor_obj_attr_size (bfd
*abfd
, int vendor
)
90 obj_attribute_list
*list
;
92 const char *vendor_name
= vendor_obj_attr_name (abfd
, vendor
);
97 attr
= elf_known_obj_attributes (abfd
)[vendor
];
99 for (i
= 4; i
< NUM_KNOWN_OBJ_ATTRIBUTES
; i
++)
100 size
+= obj_attr_size (i
, &attr
[i
]);
102 for (list
= elf_other_obj_attributes (abfd
)[vendor
];
105 size
+= obj_attr_size (list
->tag
, &list
->attr
);
107 /* <size> <vendor_name> NUL 0x1 <size> */
108 return ((size
|| vendor
== OBJ_ATTR_PROC
)
109 ? size
+ 10 + strlen (vendor_name
)
113 /* Return the size of the object attributes section. */
115 bfd_elf_obj_attr_size (bfd
*abfd
)
119 size
= vendor_obj_attr_size (abfd
, OBJ_ATTR_PROC
);
120 size
+= vendor_obj_attr_size (abfd
, OBJ_ATTR_GNU
);
122 /* 'A' <sections for each vendor> */
123 return (size
? size
+ 1 : 0);
126 /* Write VAL in uleb128 format to P, returning a pointer to the
129 write_uleb128 (bfd_byte
*p
, unsigned int val
)
144 /* Write attribute ATTR to butter P, and return a pointer to the following
147 write_obj_attribute (bfd_byte
*p
, int tag
, obj_attribute
*attr
)
149 /* Suppress default entries. */
150 if (is_default_attr (attr
))
153 p
= write_uleb128 (p
, tag
);
155 p
= write_uleb128 (p
, attr
->i
);
160 len
= strlen (attr
->s
) + 1;
161 memcpy (p
, attr
->s
, len
);
168 /* Write the contents of the object attributes section (length SIZE)
169 for VENDOR to CONTENTS. */
171 vendor_set_obj_attr_contents (bfd
*abfd
, bfd_byte
*contents
, bfd_vma size
,
176 obj_attribute_list
*list
;
178 const char *vendor_name
= vendor_obj_attr_name (abfd
, vendor
);
179 size_t vendor_length
= strlen (vendor_name
) + 1;
182 bfd_put_32 (abfd
, size
, p
);
184 memcpy (p
, vendor_name
, vendor_length
);
187 bfd_put_32 (abfd
, size
- 4 - vendor_length
, p
);
190 attr
= elf_known_obj_attributes (abfd
)[vendor
];
191 for (i
= 4; i
< NUM_KNOWN_OBJ_ATTRIBUTES
; i
++)
192 p
= write_obj_attribute (p
, i
, &attr
[i
]);
194 for (list
= elf_other_obj_attributes (abfd
)[vendor
];
197 p
= write_obj_attribute (p
, list
->tag
, &list
->attr
);
200 /* Write the contents of the object attributes section to CONTENTS. */
202 bfd_elf_set_obj_attr_contents (bfd
*abfd
, bfd_byte
*contents
, bfd_vma size
)
211 for (vendor
= OBJ_ATTR_FIRST
; vendor
<= OBJ_ATTR_LAST
; vendor
++)
213 bfd_vma vendor_size
= vendor_obj_attr_size (abfd
, vendor
);
215 vendor_set_obj_attr_contents (abfd
, p
, vendor_size
, vendor
);
217 my_size
+= vendor_size
;
224 /* Allocate/find an object attribute. */
225 static obj_attribute
*
226 elf_new_obj_attr (bfd
*abfd
, int vendor
, int tag
)
229 obj_attribute_list
*list
;
230 obj_attribute_list
*p
;
231 obj_attribute_list
**lastp
;
234 if (tag
< NUM_KNOWN_OBJ_ATTRIBUTES
)
236 /* Knwon tags are preallocated. */
237 attr
= &elf_known_obj_attributes (abfd
)[vendor
][tag
];
241 /* Create a new tag. */
242 list
= (obj_attribute_list
*)
243 bfd_alloc (abfd
, sizeof (obj_attribute_list
));
244 memset (list
, 0, sizeof (obj_attribute_list
));
246 /* Keep the tag list in order. */
247 lastp
= &elf_other_obj_attributes (abfd
)[vendor
];
248 for (p
= *lastp
; p
; p
= p
->next
)
262 /* Return the value of an integer object attribute. */
264 bfd_elf_get_obj_attr_int (bfd
*abfd
, int vendor
, int tag
)
266 obj_attribute_list
*p
;
268 if (tag
< NUM_KNOWN_OBJ_ATTRIBUTES
)
270 /* Knwon tags are preallocated. */
271 return elf_known_obj_attributes (abfd
)[vendor
][tag
].i
;
275 for (p
= elf_other_obj_attributes (abfd
)[vendor
];
288 /* Add an integer object attribute. */
290 bfd_elf_add_obj_attr_int (bfd
*abfd
, int vendor
, int tag
, unsigned int i
)
294 attr
= elf_new_obj_attr (abfd
, vendor
, tag
);
295 attr
->type
= _bfd_elf_obj_attrs_arg_type (abfd
, vendor
, tag
);
299 /* Duplicate an object attribute string value. */
301 _bfd_elf_attr_strdup (bfd
*abfd
, const char * s
)
306 len
= strlen (s
) + 1;
307 p
= (char *) bfd_alloc (abfd
, len
);
308 return memcpy (p
, s
, len
);
311 /* Add a string object attribute. */
313 bfd_elf_add_obj_attr_string (bfd
*abfd
, int vendor
, int tag
, const char *s
)
317 attr
= elf_new_obj_attr (abfd
, vendor
, tag
);
318 attr
->type
= _bfd_elf_obj_attrs_arg_type (abfd
, vendor
, tag
);
319 attr
->s
= _bfd_elf_attr_strdup (abfd
, s
);
322 /* Add a int+string object attribute. */
324 bfd_elf_add_obj_attr_int_string (bfd
*abfd
, int vendor
, int tag
,
325 unsigned int i
, const char *s
)
329 attr
= elf_new_obj_attr (abfd
, vendor
, tag
);
330 attr
->type
= _bfd_elf_obj_attrs_arg_type (abfd
, vendor
, tag
);
332 attr
->s
= _bfd_elf_attr_strdup (abfd
, s
);
335 /* Copy the object attributes from IBFD to OBFD. */
337 _bfd_elf_copy_obj_attributes (bfd
*ibfd
, bfd
*obfd
)
339 obj_attribute
*in_attr
;
340 obj_attribute
*out_attr
;
341 obj_attribute_list
*list
;
345 for (vendor
= OBJ_ATTR_FIRST
; vendor
<= OBJ_ATTR_LAST
; vendor
++)
347 in_attr
= &elf_known_obj_attributes (ibfd
)[vendor
][4];
348 out_attr
= &elf_known_obj_attributes (obfd
)[vendor
][4];
349 for (i
= 4; i
< NUM_KNOWN_OBJ_ATTRIBUTES
; i
++)
351 out_attr
->type
= in_attr
->type
;
352 out_attr
->i
= in_attr
->i
;
353 if (in_attr
->s
&& *in_attr
->s
)
354 out_attr
->s
= _bfd_elf_attr_strdup (obfd
, in_attr
->s
);
359 for (list
= elf_other_obj_attributes (ibfd
)[vendor
];
363 in_attr
= &list
->attr
;
364 switch (in_attr
->type
)
367 bfd_elf_add_obj_attr_int (obfd
, vendor
, list
->tag
, in_attr
->i
);
370 bfd_elf_add_obj_attr_string (obfd
, vendor
, list
->tag
,
374 bfd_elf_add_obj_attr_int_string (obfd
, vendor
, list
->tag
,
375 in_attr
->i
, in_attr
->s
);
384 /* Determine whether a GNU object attribute tag takes an integer, a
387 gnu_obj_attrs_arg_type (int tag
)
389 /* Except for Tag_compatibility, for GNU attributes we follow the
390 same rule ARM ones > 32 follow: odd-numbered tags take strings
391 and even-numbered tags take integers. In addition, tag & 2 is
392 nonzero for architecture-independent tags and zero for
393 architecture-dependent ones. */
394 if (tag
== Tag_compatibility
)
397 return (tag
& 1) != 0 ? 2 : 1;
400 /* Determine what arguments an attribute tag takes. */
402 _bfd_elf_obj_attrs_arg_type (bfd
*abfd
, int vendor
, int tag
)
407 return get_elf_backend_data (abfd
)->obj_attrs_arg_type (tag
);
410 return gnu_obj_attrs_arg_type (tag
);
417 /* Parse an object attributes section. */
419 _bfd_elf_parse_attributes (bfd
*abfd
, Elf_Internal_Shdr
* hdr
)
424 const char *std_section
;
426 contents
= bfd_malloc (hdr
->sh_size
);
429 if (!bfd_get_section_contents (abfd
, hdr
->bfd_section
, contents
, 0,
436 std_section
= get_elf_backend_data (abfd
)->obj_attrs_vendor
;
439 len
= hdr
->sh_size
- 1;
446 section_len
= bfd_get_32 (abfd
, p
);
448 if (section_len
> len
)
451 namelen
= strlen ((char *)p
) + 1;
452 section_len
-= namelen
+ 4;
453 if (std_section
&& strcmp ((char *)p
, std_section
) == 0)
454 vendor
= OBJ_ATTR_PROC
;
455 else if (strcmp ((char *)p
, "gnu") == 0)
456 vendor
= OBJ_ATTR_GNU
;
459 /* Other vendor section. Ignore it. */
460 p
+= namelen
+ section_len
;
465 while (section_len
> 0)
470 bfd_vma subsection_len
;
473 tag
= read_unsigned_leb128 (abfd
, p
, &n
);
475 subsection_len
= bfd_get_32 (abfd
, p
);
477 if (subsection_len
> section_len
)
478 subsection_len
= section_len
;
479 section_len
-= subsection_len
;
480 subsection_len
-= n
+ 4;
481 end
= p
+ subsection_len
;
489 tag
= read_unsigned_leb128 (abfd
, p
, &n
);
491 type
= _bfd_elf_obj_attrs_arg_type (abfd
, vendor
, tag
);
495 val
= read_unsigned_leb128 (abfd
, p
, &n
);
497 bfd_elf_add_obj_attr_int_string (abfd
, vendor
, tag
,
499 p
+= strlen ((char *)p
) + 1;
502 bfd_elf_add_obj_attr_string (abfd
, vendor
, tag
,
504 p
+= strlen ((char *)p
) + 1;
507 val
= read_unsigned_leb128 (abfd
, p
, &n
);
509 bfd_elf_add_obj_attr_int (abfd
, vendor
, tag
, val
);
518 /* Don't have anywhere convenient to attach these.
519 Fall through for now. */
521 /* Ignore things we don't kow about. */
532 /* Merge common object attributes from IBFD into OBFD. Raise an error
533 if there are conflicting attributes. Any processor-specific
534 attributes have already been merged. This must be called from the
535 bfd_elfNN_bfd_merge_private_bfd_data hook for each individual
536 target, along with any target-specific merging. Because there are
537 no common attributes other than Tag_compatibility at present, and
538 non-"gnu" Tag_compatibility is not expected in "gnu" sections, this
539 is not presently called for targets without their own
543 _bfd_elf_merge_object_attributes (bfd
*ibfd
, bfd
*obfd
)
545 obj_attribute
*in_attr
;
546 obj_attribute
*out_attr
;
549 /* The only common attribute is currently Tag_compatibility,
550 accepted in both processor and "gnu" sections. */
551 for (vendor
= OBJ_ATTR_FIRST
; vendor
<= OBJ_ATTR_LAST
; vendor
++)
553 /* Handle Tag_compatibility. The tags are only compatible if the flags
554 are identical and, if the flags are '1', the strings are identical.
555 If the flags are non-zero, then we can only use the string "gnu". */
556 in_attr
= &elf_known_obj_attributes (ibfd
)[vendor
][Tag_compatibility
];
557 out_attr
= &elf_known_obj_attributes (obfd
)[vendor
][Tag_compatibility
];
559 if (in_attr
->i
> 0 && strcmp (in_attr
->s
, "gnu") != 0)
562 (_("ERROR: %B: Must be processed by '%s' toolchain"),
567 if (in_attr
->i
!= out_attr
->i
568 || (in_attr
->i
!= 0 && strcmp (in_attr
->s
, out_attr
->s
) != 0))
570 _bfd_error_handler (_("ERROR: %B: Object tag '%d, %s' is "
571 "incompatible with tag '%d, %s'"),
573 in_attr
->i
, in_attr
->s
? in_attr
->s
: "",
574 out_attr
->i
, out_attr
->s
? out_attr
->s
: "");
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