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1 | /* ELF support for BFD. |
2 | Copyright (C) 1991, 92, 93, 94, 95, 97, 1998 Free Software Foundation, Inc. | |
3 | ||
4 | Written by Fred Fish @ Cygnus Support, from information published | |
5 | in "UNIX System V Release 4, Programmers Guide: ANSI C and | |
6 | Programming Support Tools". | |
7 | ||
8 | This file is part of BFD, the Binary File Descriptor library. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | ||
25 | /* This file is part of ELF support for BFD, and contains the portions | |
26 | that describe how ELF is represented internally in the BFD library. | |
27 | I.E. it describes the in-memory representation of ELF. It requires | |
28 | the elf-common.h file which contains the portions that are common to | |
29 | both the internal and external representations. */ | |
30 | ||
31 | ||
32 | /* NOTE that these structures are not kept in the same order as they appear | |
33 | in the object file. In some cases they've been reordered for more optimal | |
34 | packing under various circumstances. */ | |
35 | ||
36 | #ifndef _ELF_INTERNAL_H | |
37 | #define _ELF_INTERNAL_H | |
38 | ||
39 | /* ELF Header */ | |
40 | ||
41 | #define EI_NIDENT 16 /* Size of e_ident[] */ | |
42 | ||
43 | typedef struct elf_internal_ehdr { | |
44 | unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ | |
45 | bfd_vma e_entry; /* Entry point virtual address */ | |
46 | bfd_size_type e_phoff; /* Program header table file offset */ | |
47 | bfd_size_type e_shoff; /* Section header table file offset */ | |
48 | unsigned long e_version; /* Identifies object file version */ | |
49 | unsigned long e_flags; /* Processor-specific flags */ | |
50 | unsigned short e_type; /* Identifies object file type */ | |
51 | unsigned short e_machine; /* Specifies required architecture */ | |
52 | unsigned short e_ehsize; /* ELF header size in bytes */ | |
53 | unsigned short e_phentsize; /* Program header table entry size */ | |
54 | unsigned short e_phnum; /* Program header table entry count */ | |
55 | unsigned short e_shentsize; /* Section header table entry size */ | |
56 | unsigned short e_shnum; /* Section header table entry count */ | |
57 | unsigned short e_shstrndx; /* Section header string table index */ | |
58 | } Elf_Internal_Ehdr; | |
59 | ||
60 | #define elf32_internal_ehdr elf_internal_ehdr | |
61 | #define Elf32_Internal_Ehdr Elf_Internal_Ehdr | |
62 | #define elf64_internal_ehdr elf_internal_ehdr | |
63 | #define Elf64_Internal_Ehdr Elf_Internal_Ehdr | |
64 | ||
65 | /* Program header */ | |
66 | ||
67 | struct elf_internal_phdr { | |
68 | unsigned long p_type; /* Identifies program segment type */ | |
69 | unsigned long p_flags; /* Segment flags */ | |
70 | bfd_vma p_offset; /* Segment file offset */ | |
71 | bfd_vma p_vaddr; /* Segment virtual address */ | |
72 | bfd_vma p_paddr; /* Segment physical address */ | |
73 | bfd_vma p_filesz; /* Segment size in file */ | |
74 | bfd_vma p_memsz; /* Segment size in memory */ | |
75 | bfd_vma p_align; /* Segment alignment, file & memory */ | |
76 | }; | |
77 | ||
78 | typedef struct elf_internal_phdr Elf_Internal_Phdr; | |
79 | #define elf32_internal_phdr elf_internal_phdr | |
80 | #define Elf32_Internal_Phdr Elf_Internal_Phdr | |
81 | #define elf64_internal_phdr elf_internal_phdr | |
82 | #define Elf64_Internal_Phdr Elf_Internal_Phdr | |
83 | ||
84 | /* Section header */ | |
85 | ||
86 | typedef struct elf_internal_shdr { | |
87 | unsigned int sh_name; /* Section name, index in string tbl */ | |
88 | unsigned int sh_type; /* Type of section */ | |
89 | bfd_vma sh_flags; /* Miscellaneous section attributes */ | |
90 | bfd_vma sh_addr; /* Section virtual addr at execution */ | |
91 | bfd_size_type sh_size; /* Size of section in bytes */ | |
92 | bfd_size_type sh_entsize; /* Entry size if section holds table */ | |
93 | unsigned long sh_link; /* Index of another section */ | |
94 | unsigned long sh_info; /* Additional section information */ | |
95 | file_ptr sh_offset; /* Section file offset */ | |
96 | unsigned int sh_addralign; /* Section alignment */ | |
97 | ||
98 | /* The internal rep also has some cached info associated with it. */ | |
99 | asection * bfd_section; /* Associated BFD section. */ | |
100 | PTR contents; /* Section contents. */ | |
101 | } Elf_Internal_Shdr; | |
102 | ||
103 | #define elf32_internal_shdr elf_internal_shdr | |
104 | #define Elf32_Internal_Shdr Elf_Internal_Shdr | |
105 | #define elf64_internal_shdr elf_internal_shdr | |
106 | #define Elf64_Internal_Shdr Elf_Internal_Shdr | |
107 | ||
108 | /* Symbol table entry */ | |
109 | ||
110 | struct elf_internal_sym { | |
111 | bfd_vma st_value; /* Value of the symbol */ | |
112 | bfd_vma st_size; /* Associated symbol size */ | |
113 | unsigned long st_name; /* Symbol name, index in string tbl */ | |
114 | unsigned char st_info; /* Type and binding attributes */ | |
115 | unsigned char st_other; /* No defined meaning, 0 */ | |
116 | unsigned short st_shndx; /* Associated section index */ | |
117 | }; | |
118 | ||
119 | typedef struct elf_internal_sym Elf_Internal_Sym; | |
120 | ||
121 | #define elf32_internal_sym elf_internal_sym | |
122 | #define elf64_internal_sym elf_internal_sym | |
123 | #define Elf32_Internal_Sym Elf_Internal_Sym | |
124 | #define Elf64_Internal_Sym Elf_Internal_Sym | |
125 | ||
126 | /* Note segments */ | |
127 | ||
128 | typedef struct elf_internal_note { | |
129 | unsigned long namesz; /* Size of entry's owner string */ | |
130 | unsigned long descsz; /* Size of the note descriptor */ | |
131 | unsigned long type; /* Interpretation of the descriptor */ | |
132 | char * namedata; /* Start of the name+desc data */ | |
133 | char * descdata; /* Start of the desc data */ | |
134 | bfd_vma descpos; /* File offset of the descdata */ | |
135 | } Elf_Internal_Note; | |
136 | #define Elf32_Internal_Note Elf_Internal_Note | |
137 | #define elf32_internal_note elf_internal_note | |
138 | ||
139 | /* Relocation Entries */ | |
140 | ||
141 | typedef struct elf_internal_rel { | |
142 | bfd_vma r_offset; /* Location at which to apply the action */ | |
143 | /* This needs to support 64-bit values in elf64. */ | |
144 | bfd_vma r_info; /* index and type of relocation */ | |
145 | } Elf_Internal_Rel; | |
146 | ||
147 | #define elf32_internal_rel elf_internal_rel | |
148 | #define Elf32_Internal_Rel Elf_Internal_Rel | |
149 | #define elf64_internal_rel elf_internal_rel | |
150 | #define Elf64_Internal_Rel Elf_Internal_Rel | |
151 | ||
152 | typedef struct elf_internal_rela { | |
153 | bfd_vma r_offset; /* Location at which to apply the action */ | |
154 | bfd_vma r_info; /* Index and Type of relocation */ | |
155 | bfd_signed_vma r_addend; /* Constant addend used to compute value */ | |
156 | } Elf_Internal_Rela; | |
157 | ||
158 | #define elf32_internal_rela elf_internal_rela | |
159 | #define elf64_internal_rela elf_internal_rela | |
160 | #define Elf32_Internal_Rela Elf_Internal_Rela | |
161 | #define Elf64_Internal_Rela Elf_Internal_Rela | |
162 | ||
163 | /* dynamic section structure */ | |
164 | ||
165 | typedef struct elf_internal_dyn { | |
166 | /* This needs to support 64-bit values in elf64. */ | |
167 | bfd_vma d_tag; /* entry tag value */ | |
168 | union { | |
169 | /* This needs to support 64-bit values in elf64. */ | |
170 | bfd_vma d_val; | |
171 | bfd_vma d_ptr; | |
172 | } d_un; | |
173 | } Elf_Internal_Dyn; | |
174 | ||
175 | #define elf32_internal_dyn elf_internal_dyn | |
176 | #define elf64_internal_dyn elf_internal_dyn | |
177 | #define Elf32_Internal_Dyn Elf_Internal_Dyn | |
178 | #define Elf64_Internal_Dyn Elf_Internal_Dyn | |
179 | ||
180 | /* This structure appears in a SHT_GNU_verdef section. */ | |
181 | ||
182 | typedef struct elf_internal_verdef { | |
183 | unsigned short vd_version; /* Version number of structure. */ | |
184 | unsigned short vd_flags; /* Flags (VER_FLG_*). */ | |
185 | unsigned short vd_ndx; /* Version index. */ | |
186 | unsigned short vd_cnt; /* Number of verdaux entries. */ | |
187 | unsigned long vd_hash; /* Hash of name. */ | |
188 | unsigned long vd_aux; /* Offset to verdaux entries. */ | |
189 | unsigned long vd_next; /* Offset to next verdef. */ | |
190 | ||
191 | /* These fields are set up when BFD reads in the structure. FIXME: | |
192 | It would be cleaner to store these in a different structure. */ | |
193 | bfd *vd_bfd; /* BFD. */ | |
194 | const char *vd_nodename; /* Version name. */ | |
195 | struct elf_internal_verdef *vd_nextdef; /* vd_next as pointer. */ | |
196 | struct elf_internal_verdaux *vd_auxptr; /* vd_aux as pointer. */ | |
197 | unsigned int vd_exp_refno; /* Used by the linker. */ | |
198 | } Elf_Internal_Verdef; | |
199 | ||
200 | /* This structure appears in a SHT_GNU_verdef section. */ | |
201 | ||
202 | typedef struct elf_internal_verdaux { | |
203 | unsigned long vda_name; /* String table offset of name. */ | |
204 | unsigned long vda_next; /* Offset to next verdaux. */ | |
205 | ||
206 | /* These fields are set up when BFD reads in the structure. FIXME: | |
207 | It would be cleaner to store these in a different structure. */ | |
208 | const char *vda_nodename; /* vda_name as pointer. */ | |
209 | struct elf_internal_verdaux *vda_nextptr; /* vda_next as pointer. */ | |
210 | } Elf_Internal_Verdaux; | |
211 | ||
212 | /* This structure appears in a SHT_GNU_verneed section. */ | |
213 | ||
214 | typedef struct elf_internal_verneed { | |
215 | unsigned short vn_version; /* Version number of structure. */ | |
216 | unsigned short vn_cnt; /* Number of vernaux entries. */ | |
217 | unsigned long vn_file; /* String table offset of library name. */ | |
218 | unsigned long vn_aux; /* Offset to vernaux entries. */ | |
219 | unsigned long vn_next; /* Offset to next verneed. */ | |
220 | ||
221 | /* These fields are set up when BFD reads in the structure. FIXME: | |
222 | It would be cleaner to store these in a different structure. */ | |
223 | bfd *vn_bfd; /* BFD. */ | |
224 | const char *vn_filename; /* vn_file as pointer. */ | |
225 | struct elf_internal_vernaux *vn_auxptr; /* vn_aux as pointer. */ | |
226 | struct elf_internal_verneed *vn_nextref; /* vn_nextref as pointer. */ | |
227 | } Elf_Internal_Verneed; | |
228 | ||
229 | /* This structure appears in a SHT_GNU_verneed section. */ | |
230 | ||
231 | typedef struct elf_internal_vernaux { | |
232 | unsigned long vna_hash; /* Hash of dependency name. */ | |
233 | unsigned short vna_flags; /* Flags (VER_FLG_*). */ | |
234 | unsigned short vna_other; /* Unused. */ | |
235 | unsigned long vna_name; /* String table offset to version name. */ | |
236 | unsigned long vna_next; /* Offset to next vernaux. */ | |
237 | ||
238 | /* These fields are set up when BFD reads in the structure. FIXME: | |
239 | It would be cleaner to store these in a different structure. */ | |
240 | const char *vna_nodename; /* vna_name as pointer. */ | |
241 | struct elf_internal_vernaux *vna_nextptr; /* vna_next as pointer. */ | |
242 | } Elf_Internal_Vernaux; | |
243 | ||
244 | /* This structure appears in a SHT_GNU_versym section. This is not a | |
245 | standard ELF structure; ELF just uses Elf32_Half. */ | |
246 | ||
247 | typedef struct elf_internal_versym { | |
248 | unsigned short vs_vers; | |
249 | } Elf_Internal_Versym; | |
250 | ||
251 | /* Structure for syminfo section. */ | |
252 | typedef struct | |
253 | { | |
254 | unsigned short int si_boundto; | |
255 | unsigned short int si_flags; | |
256 | } Elf_Internal_Syminfo; | |
257 | ||
258 | ||
259 | #define elf32_internal_verdef elf_internal_verdef | |
260 | #define elf64_internal_verdef elf_internal_verdef | |
261 | #define elf32_internal_verdaux elf_internal_verdaux | |
262 | #define elf64_internal_verdaux elf_internal_verdaux | |
263 | #define elf32_internal_verneed elf_internal_verneed | |
264 | #define elf64_internal_verneed elf_internal_verneed | |
265 | #define elf32_internal_vernaux elf_internal_vernaux | |
266 | #define elf64_internal_vernaux elf_internal_vernaux | |
267 | #define elf32_internal_versym elf_internal_versym | |
268 | #define elf64_internal_versym elf_internal_versym | |
269 | ||
270 | #define Elf32_Internal_Verdef Elf_Internal_Verdef | |
271 | #define Elf64_Internal_Verdef Elf_Internal_Verdef | |
272 | #define Elf32_Internal_Verdaux Elf_Internal_Verdaux | |
273 | #define Elf64_Internal_Verdaux Elf_Internal_Verdaux | |
274 | #define Elf32_Internal_Verneed Elf_Internal_Verneed | |
275 | #define Elf64_Internal_Verneed Elf_Internal_Verneed | |
276 | #define Elf32_Internal_Vernaux Elf_Internal_Vernaux | |
277 | #define Elf64_Internal_Vernaux Elf_Internal_Vernaux | |
278 | #define Elf32_Internal_Versym Elf_Internal_Versym | |
279 | #define Elf64_Internal_Versym Elf_Internal_Versym | |
280 | #define Elf32_Internal_Syminfo Elf_Internal_Syminfo | |
281 | #define Elf64_Internal_Syminfo Elf_Internal_Syminfo | |
282 | ||
283 | /* This structure is used to describe how sections should be assigned | |
284 | to program segments. */ | |
285 | ||
286 | struct elf_segment_map | |
287 | { | |
288 | /* Next program segment. */ | |
289 | struct elf_segment_map *next; | |
290 | /* Program segment type. */ | |
291 | unsigned long p_type; | |
292 | /* Program segment flags. */ | |
293 | unsigned long p_flags; | |
294 | /* Program segment physical address. */ | |
295 | bfd_vma p_paddr; | |
296 | /* Whether the p_flags field is valid; if not, the flags are based | |
297 | on the section flags. */ | |
298 | unsigned int p_flags_valid : 1; | |
299 | /* Whether the p_paddr field is valid; if not, the physical address | |
300 | is based on the section lma values. */ | |
301 | unsigned int p_paddr_valid : 1; | |
302 | /* Whether this segment includes the file header. */ | |
303 | unsigned int includes_filehdr : 1; | |
304 | /* Whether this segment includes the program headers. */ | |
305 | unsigned int includes_phdrs : 1; | |
306 | /* Number of sections (may be 0). */ | |
307 | unsigned int count; | |
308 | /* Sections. Actual number of elements is in count field. */ | |
309 | asection *sections[1]; | |
310 | }; | |
311 | ||
312 | #endif /* _ELF_INTERNAL_H */ |