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1 | /* simple.c -- BFD simple client routines |
2 | Copyright 2002 | |
3 | Free Software Foundation, Inc. | |
4 | Contributed by MontaVista Software, Inc. | |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "bfd.h" | |
23 | #include "sysdep.h" | |
24 | #include "libbfd.h" | |
25 | #include "bfdlink.h" | |
26 | ||
27 | static boolean | |
28 | simple_dummy_warning (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, | |
29 | const char *warning ATTRIBUTE_UNUSED, | |
30 | const char *symbol ATTRIBUTE_UNUSED, | |
31 | bfd *abfd ATTRIBUTE_UNUSED, | |
32 | asection *section ATTRIBUTE_UNUSED, | |
33 | bfd_vma address ATTRIBUTE_UNUSED) | |
34 | { | |
35 | return true; | |
36 | } | |
37 | ||
38 | static boolean | |
39 | simple_dummy_undefined_symbol (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, | |
40 | const char *name ATTRIBUTE_UNUSED, | |
41 | bfd *abfd ATTRIBUTE_UNUSED, | |
42 | asection *section ATTRIBUTE_UNUSED, | |
43 | bfd_vma address ATTRIBUTE_UNUSED, | |
44 | boolean fatal ATTRIBUTE_UNUSED) | |
45 | { | |
46 | return true; | |
47 | } | |
48 | ||
49 | static boolean | |
50 | simple_dummy_reloc_overflow (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, | |
51 | const char *name ATTRIBUTE_UNUSED, | |
52 | const char *reloc_name ATTRIBUTE_UNUSED, | |
53 | bfd_vma addend ATTRIBUTE_UNUSED, | |
54 | bfd *abfd ATTRIBUTE_UNUSED, | |
55 | asection *section ATTRIBUTE_UNUSED, | |
56 | bfd_vma address ATTRIBUTE_UNUSED) | |
57 | { | |
58 | return true; | |
59 | } | |
60 | ||
61 | static boolean | |
62 | simple_dummy_reloc_dangerous (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, | |
63 | const char *message ATTRIBUTE_UNUSED, | |
64 | bfd *abfd ATTRIBUTE_UNUSED, | |
65 | asection *section ATTRIBUTE_UNUSED, | |
66 | bfd_vma address ATTRIBUTE_UNUSED) | |
67 | { | |
68 | return true; | |
69 | } | |
70 | ||
71 | static boolean | |
72 | simple_dummy_unattached_reloc (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, | |
73 | const char *name ATTRIBUTE_UNUSED, | |
74 | bfd *abfd ATTRIBUTE_UNUSED, | |
75 | asection *section ATTRIBUTE_UNUSED, | |
76 | bfd_vma address ATTRIBUTE_UNUSED) | |
77 | { | |
78 | return true; | |
79 | } | |
80 | ||
81 | /* | |
82 | FUNCTION | |
83 | bfd_simple_relocate_secton | |
84 | ||
85 | SYNOPSIS | |
86 | bfd_byte *bfd_simple_get_relocated_section_contents (bfd *abfd, asection *sec, bfd_byte *outbuf); | |
87 | ||
88 | DESCRIPTION | |
89 | Returns the relocated contents of section @var{sec}. Only symbols | |
90 | from @var{abfd} and the output offsets assigned to sections in | |
91 | @var{abfd} are used. The result will be stored at @var{outbuf} | |
92 | or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}. | |
93 | ||
94 | Generally all sections in @var{abfd} should have their | |
95 | @code{output_section} pointing back to the original section. | |
96 | ||
97 | Returns @code{NULL} on a fatal error; ignores errors applying | |
98 | particular relocations. | |
99 | */ | |
100 | ||
101 | bfd_byte * | |
102 | bfd_simple_get_relocated_section_contents (bfd *abfd, asection *sec, | |
103 | bfd_byte *outbuf) | |
104 | { | |
105 | struct bfd_link_info link_info; | |
106 | struct bfd_link_order link_order; | |
107 | struct bfd_link_callbacks callbacks; | |
108 | bfd_byte *contents, *data; | |
109 | int storage_needed, number_of_symbols; | |
110 | asymbol **symbol_table; | |
111 | ||
112 | /* In order to use bfd_get_relocated_section_contents, we need | |
113 | to forge some data structures that it expects. */ | |
114 | ||
115 | /* Fill in the bare minimum number of fields for our purposes. */ | |
116 | memset (&link_info, 0, sizeof (link_info)); | |
117 | link_info.input_bfds = abfd; | |
118 | ||
119 | link_info.hash = bfd_link_hash_table_create (abfd); | |
120 | link_info.callbacks = &callbacks; | |
121 | callbacks.warning = simple_dummy_warning; | |
122 | callbacks.undefined_symbol = simple_dummy_undefined_symbol; | |
123 | callbacks.reloc_overflow = simple_dummy_reloc_overflow; | |
124 | callbacks.reloc_dangerous = simple_dummy_reloc_dangerous; | |
125 | callbacks.unattached_reloc = simple_dummy_unattached_reloc; | |
126 | ||
127 | memset (&link_order, 0, sizeof (link_order)); | |
128 | link_order.next = NULL; | |
129 | link_order.type = bfd_indirect_link_order; | |
130 | link_order.offset = 0; | |
131 | link_order.size = bfd_section_size (abfd, sec); | |
132 | link_order.u.indirect.section = sec; | |
133 | ||
134 | data = NULL; | |
135 | if (outbuf == NULL) | |
136 | { | |
137 | data = bfd_malloc (bfd_section_size (abfd, sec)); | |
138 | if (data == NULL) | |
139 | return NULL; | |
140 | outbuf = data; | |
141 | } | |
142 | bfd_link_add_symbols (abfd, &link_info); | |
143 | ||
144 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
145 | symbol_table = (asymbol **) bfd_malloc (storage_needed); | |
146 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
147 | ||
148 | contents = bfd_get_relocated_section_contents (abfd, | |
149 | &link_info, | |
150 | &link_order, | |
151 | outbuf, | |
152 | 0, | |
153 | symbol_table); | |
154 | if (contents == NULL && data != NULL) | |
155 | free (data); | |
156 | ||
157 | /* Foul hack to prevent bfd_section_size aborts. This flag only controls | |
158 | that macro (and the related size macros), selecting between _raw_size | |
159 | and _cooked_size. Debug sections won't change size while we're only | |
160 | relocating. There may be trouble here someday if it tries to run | |
161 | relaxation unexpectedly, so make sure. */ | |
162 | BFD_ASSERT (sec->_raw_size == sec->_cooked_size); | |
163 | sec->reloc_done = 0; | |
164 | ||
165 | bfd_link_hash_table_free (abfd, link_info.hash); | |
166 | ||
167 | return contents; | |
168 | } |