external.h revision 33965 
1/* ELF support for BFD.
2   Copyright (C) 1991, 92, 93, 95, 1997 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
8This file is part of BFD, the Binary File Descriptor library.
9
10This program is free software; you can redistribute it and/or modify
11it under the terms of the GNU General Public License as published by
12the Free Software Foundation; either version 2 of the License, or
13(at your option) any later version.
14
15This program is distributed in the hope that it will be useful,
16but WITHOUT ANY WARRANTY; without even the implied warranty of
17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18GNU General Public License for more details.
19
20You should have received a copy of the GNU General Public License
21along with this program; if not, write to the Free Software
22Foundation, 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 externally by the BFD library.
27   I.E. it describes the in-file 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/* The 64-bit stuff is kind of random.  Perhaps someone will publish a
32   spec someday.  */
33
34#ifndef _ELF_EXTERNAL_H
35#define _ELF_EXTERNAL_H
36
37/* ELF Header (32-bit implementations) */
38
39typedef struct {
40  unsigned char	e_ident[16];		/* ELF "magic number" */
41  unsigned char	e_type[2];		/* Identifies object file type */
42  unsigned char	e_machine[2];		/* Specifies required architecture */
43  unsigned char	e_version[4];		/* Identifies object file version */
44  unsigned char	e_entry[4];		/* Entry point virtual address */
45  unsigned char	e_phoff[4];		/* Program header table file offset */
46  unsigned char	e_shoff[4];		/* Section header table file offset */
47  unsigned char	e_flags[4];		/* Processor-specific flags */
48  unsigned char	e_ehsize[2];		/* ELF header size in bytes */
49  unsigned char	e_phentsize[2];		/* Program header table entry size */
50  unsigned char	e_phnum[2];		/* Program header table entry count */
51  unsigned char	e_shentsize[2];		/* Section header table entry size */
52  unsigned char	e_shnum[2];		/* Section header table entry count */
53  unsigned char	e_shstrndx[2];		/* Section header string table index */
54} Elf32_External_Ehdr;
55
56typedef struct {
57  unsigned char	e_ident[16];		/* ELF "magic number" */
58  unsigned char	e_type[2];		/* Identifies object file type */
59  unsigned char	e_machine[2];		/* Specifies required architecture */
60  unsigned char	e_version[4];		/* Identifies object file version */
61  unsigned char	e_entry[8];		/* Entry point virtual address */
62  unsigned char	e_phoff[8];		/* Program header table file offset */
63  unsigned char	e_shoff[8];		/* Section header table file offset */
64  unsigned char	e_flags[4];		/* Processor-specific flags */
65  unsigned char	e_ehsize[2];		/* ELF header size in bytes */
66  unsigned char	e_phentsize[2];		/* Program header table entry size */
67  unsigned char	e_phnum[2];		/* Program header table entry count */
68  unsigned char	e_shentsize[2];		/* Section header table entry size */
69  unsigned char	e_shnum[2];		/* Section header table entry count */
70  unsigned char	e_shstrndx[2];		/* Section header string table index */
71} Elf64_External_Ehdr;
72
73/* Program header */
74
75typedef struct {
76  unsigned char	p_type[4];		/* Identifies program segment type */
77  unsigned char	p_offset[4];		/* Segment file offset */
78  unsigned char	p_vaddr[4];		/* Segment virtual address */
79  unsigned char	p_paddr[4];		/* Segment physical address */
80  unsigned char	p_filesz[4];		/* Segment size in file */
81  unsigned char	p_memsz[4];		/* Segment size in memory */
82  unsigned char	p_flags[4];		/* Segment flags */
83  unsigned char	p_align[4];		/* Segment alignment, file & memory */
84} Elf32_External_Phdr;
85
86typedef struct {
87  unsigned char	p_type[4];		/* Identifies program segment type */
88  unsigned char	p_flags[4];		/* Segment flags */
89  unsigned char	p_offset[8];		/* Segment file offset */
90  unsigned char	p_vaddr[8];		/* Segment virtual address */
91  unsigned char	p_paddr[8];		/* Segment physical address */
92  unsigned char	p_filesz[8];		/* Segment size in file */
93  unsigned char	p_memsz[8];		/* Segment size in memory */
94  unsigned char	p_align[8];		/* Segment alignment, file & memory */
95} Elf64_External_Phdr;
96
97/* Section header */
98
99typedef struct {
100  unsigned char	sh_name[4];		/* Section name, index in string tbl */
101  unsigned char	sh_type[4];		/* Type of section */
102  unsigned char	sh_flags[4];		/* Miscellaneous section attributes */
103  unsigned char	sh_addr[4];		/* Section virtual addr at execution */
104  unsigned char	sh_offset[4];		/* Section file offset */
105  unsigned char	sh_size[4];		/* Size of section in bytes */
106  unsigned char	sh_link[4];		/* Index of another section */
107  unsigned char	sh_info[4];		/* Additional section information */
108  unsigned char	sh_addralign[4];	/* Section alignment */
109  unsigned char	sh_entsize[4];		/* Entry size if section holds table */
110} Elf32_External_Shdr;
111
112typedef struct {
113  unsigned char	sh_name[4];		/* Section name, index in string tbl */
114  unsigned char	sh_type[4];		/* Type of section */
115  unsigned char	sh_flags[8];		/* Miscellaneous section attributes */
116  unsigned char	sh_addr[8];		/* Section virtual addr at execution */
117  unsigned char	sh_offset[8];		/* Section file offset */
118  unsigned char	sh_size[8];		/* Size of section in bytes */
119  unsigned char	sh_link[4];		/* Index of another section */
120  unsigned char	sh_info[4];		/* Additional section information */
121  unsigned char	sh_addralign[8];	/* Section alignment */
122  unsigned char	sh_entsize[8];		/* Entry size if section holds table */
123} Elf64_External_Shdr;
124
125/* Symbol table entry */
126
127typedef struct {
128  unsigned char	st_name[4];		/* Symbol name, index in string tbl */
129  unsigned char	st_value[4];		/* Value of the symbol */
130  unsigned char	st_size[4];		/* Associated symbol size */
131  unsigned char	st_info[1];		/* Type and binding attributes */
132  unsigned char	st_other[1];		/* No defined meaning, 0 */
133  unsigned char	st_shndx[2];		/* Associated section index */
134} Elf32_External_Sym;
135
136typedef struct {
137  unsigned char	st_name[4];		/* Symbol name, index in string tbl */
138  unsigned char	st_info[1];		/* Type and binding attributes */
139  unsigned char	st_other[1];		/* No defined meaning, 0 */
140  unsigned char	st_shndx[2];		/* Associated section index */
141  unsigned char	st_value[8];		/* Value of the symbol */
142  unsigned char	st_size[8];		/* Associated symbol size */
143} Elf64_External_Sym;
144
145/* Note segments */
146
147typedef struct {
148  unsigned char	namesz[4];		/* Size of entry's owner string */
149  unsigned char	descsz[4];		/* Size of the note descriptor */
150  unsigned char	type[4];		/* Interpretation of the descriptor */
151  char		name[1];		/* Start of the name+desc data */
152} Elf_External_Note;
153
154/* Relocation Entries */
155typedef struct {
156  unsigned char r_offset[4];	/* Location at which to apply the action */
157  unsigned char	r_info[4];	/* index and type of relocation */
158} Elf32_External_Rel;
159
160typedef struct {
161  unsigned char r_offset[4];	/* Location at which to apply the action */
162  unsigned char	r_info[4];	/* index and type of relocation */
163  unsigned char	r_addend[4];	/* Constant addend used to compute value */
164} Elf32_External_Rela;
165
166typedef struct {
167  unsigned char r_offset[8];	/* Location at which to apply the action */
168  unsigned char	r_info[8];	/* index and type of relocation */
169} Elf64_External_Rel;
170
171typedef struct {
172  unsigned char r_offset[8];	/* Location at which to apply the action */
173  unsigned char	r_info[8];	/* index and type of relocation */
174  unsigned char	r_addend[8];	/* Constant addend used to compute value */
175} Elf64_External_Rela;
176
177/* dynamic section structure */
178
179typedef struct {
180  unsigned char	d_tag[4];		/* entry tag value */
181  union {
182    unsigned char	d_val[4];
183    unsigned char	d_ptr[4];
184  } d_un;
185} Elf32_External_Dyn;
186
187typedef struct {
188  unsigned char	d_tag[8];		/* entry tag value */
189  union {
190    unsigned char	d_val[8];
191    unsigned char	d_ptr[8];
192  } d_un;
193} Elf64_External_Dyn;
194
195/* The version structures are currently size independent.  They are
196   named without a 32 or 64.  If that ever changes, these structures
197   will need to be renamed.  */
198
199/* This structure appears in a SHT_GNU_verdef section.  */
200
201typedef struct {
202  unsigned char		vd_version[2];
203  unsigned char		vd_flags[2];
204  unsigned char		vd_ndx[2];
205  unsigned char		vd_cnt[2];
206  unsigned char		vd_hash[4];
207  unsigned char		vd_aux[4];
208  unsigned char		vd_next[4];
209} Elf_External_Verdef;
210
211/* This structure appears in a SHT_GNU_verdef section.  */
212
213typedef struct {
214  unsigned char		vda_name[4];
215  unsigned char		vda_next[4];
216} Elf_External_Verdaux;
217
218/* This structure appears in a SHT_GNU_verneed section.  */
219
220typedef struct {
221  unsigned char		vn_version[2];
222  unsigned char		vn_cnt[2];
223  unsigned char		vn_file[4];
224  unsigned char		vn_aux[4];
225  unsigned char		vn_next[4];
226} Elf_External_Verneed;
227
228/* This structure appears in a SHT_GNU_verneed section.  */
229
230typedef struct {
231  unsigned char		vna_hash[4];
232  unsigned char		vna_flags[2];
233  unsigned char		vna_other[2];
234  unsigned char		vna_name[4];
235  unsigned char		vna_next[4];
236} Elf_External_Vernaux;
237
238/* This structure appears in a SHT_GNU_versym section.  This is not a
239   standard ELF structure; ELF just uses Elf32_Half.  */
240
241typedef struct {
242  unsigned char		vs_vers[2];
243} Elf_External_Versym;
244
245#endif /* _ELF_EXTERNAL_H */
246