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252b5132 | 1 | /* ELF support for BFD. |
c3aa17e9 | 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1997, 1998, 2000, 2001, 2002, |
9957b18f | 3 | 2003, 2006, 2007, 2008, 2010 Free Software Foundation, Inc. |
252b5132 RH |
4 | |
5 | Written by Fred Fish @ Cygnus Support, from information published | |
6 | in "UNIX System V Release 4, Programmers Guide: ANSI C and | |
7 | Programming Support Tools". | |
8 | ||
e4e42b45 | 9 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 10 | |
e4e42b45 NC |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 3 of the License, or | |
14 | (at your option) any later version. | |
252b5132 | 15 | |
e4e42b45 NC |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
252b5132 | 20 | |
e4e42b45 NC |
21 | You should have received a copy of the GNU General Public License |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
24 | MA 02110-1301, USA. */ | |
252b5132 RH |
25 | |
26 | /* This file is part of ELF support for BFD, and contains the portions | |
27 | that describe how ELF is represented internally in the BFD library. | |
28 | I.E. it describes the in-memory representation of ELF. It requires | |
29 | the elf-common.h file which contains the portions that are common to | |
e4e42b45 | 30 | both the internal and external representations. */ |
252b5132 RH |
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 | ||
4fbb74a6 AM |
39 | /* Special section indices, which may show up in st_shndx fields, among |
40 | other places. */ | |
41 | ||
42 | #undef SHN_UNDEF | |
43 | #undef SHN_LORESERVE | |
44 | #undef SHN_LOPROC | |
45 | #undef SHN_HIPROC | |
46 | #undef SHN_LOOS | |
47 | #undef SHN_HIOS | |
48 | #undef SHN_ABS | |
49 | #undef SHN_COMMON | |
50 | #undef SHN_XINDEX | |
51 | #undef SHN_HIRESERVE | |
52 | #define SHN_UNDEF 0 /* Undefined section reference */ | |
53 | #define SHN_LORESERVE (-0x100u) /* Begin range of reserved indices */ | |
54 | #define SHN_LOPROC (-0x100u) /* Begin range of appl-specific */ | |
55 | #define SHN_HIPROC (-0xE1u) /* End range of appl-specific */ | |
56 | #define SHN_LOOS (-0xE0u) /* OS specific semantics, lo */ | |
57 | #define SHN_HIOS (-0xC1u) /* OS specific semantics, hi */ | |
58 | #define SHN_ABS (-0xFu) /* Associated symbol is absolute */ | |
59 | #define SHN_COMMON (-0xEu) /* Associated symbol is in common */ | |
60 | #define SHN_XINDEX (-0x1u) /* Section index is held elsewhere */ | |
61 | #define SHN_HIRESERVE (-0x1u) /* End range of reserved indices */ | |
62 | #define SHN_BAD (-0x101u) /* Used internally by bfd */ | |
63 | ||
252b5132 RH |
64 | /* ELF Header */ |
65 | ||
66 | #define EI_NIDENT 16 /* Size of e_ident[] */ | |
67 | ||
68 | typedef struct elf_internal_ehdr { | |
39e74e81 AM |
69 | unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ |
70 | bfd_vma e_entry; /* Entry point virtual address */ | |
71 | bfd_size_type e_phoff; /* Program header table file offset */ | |
72 | bfd_size_type e_shoff; /* Section header table file offset */ | |
73 | unsigned long e_version; /* Identifies object file version */ | |
74 | unsigned long e_flags; /* Processor-specific flags */ | |
75 | unsigned short e_type; /* Identifies object file type */ | |
76 | unsigned short e_machine; /* Specifies required architecture */ | |
2d4d1975 AM |
77 | unsigned int e_ehsize; /* ELF header size in bytes */ |
78 | unsigned int e_phentsize; /* Program header table entry size */ | |
79 | unsigned int e_phnum; /* Program header table entry count */ | |
80 | unsigned int e_shentsize; /* Section header table entry size */ | |
81 | unsigned int e_shnum; /* Section header table entry count */ | |
82 | unsigned int e_shstrndx; /* Section header string table index */ | |
252b5132 RH |
83 | } Elf_Internal_Ehdr; |
84 | ||
252b5132 RH |
85 | /* Program header */ |
86 | ||
87 | struct elf_internal_phdr { | |
88 | unsigned long p_type; /* Identifies program segment type */ | |
89 | unsigned long p_flags; /* Segment flags */ | |
90 | bfd_vma p_offset; /* Segment file offset */ | |
91 | bfd_vma p_vaddr; /* Segment virtual address */ | |
92 | bfd_vma p_paddr; /* Segment physical address */ | |
93 | bfd_vma p_filesz; /* Segment size in file */ | |
94 | bfd_vma p_memsz; /* Segment size in memory */ | |
95 | bfd_vma p_align; /* Segment alignment, file & memory */ | |
96 | }; | |
97 | ||
98 | typedef struct elf_internal_phdr Elf_Internal_Phdr; | |
252b5132 RH |
99 | |
100 | /* Section header */ | |
101 | ||
102 | typedef struct elf_internal_shdr { | |
103 | unsigned int sh_name; /* Section name, index in string tbl */ | |
104 | unsigned int sh_type; /* Type of section */ | |
105 | bfd_vma sh_flags; /* Miscellaneous section attributes */ | |
106 | bfd_vma sh_addr; /* Section virtual addr at execution */ | |
72de5009 | 107 | file_ptr sh_offset; /* Section file offset */ |
252b5132 | 108 | bfd_size_type sh_size; /* Size of section in bytes */ |
72de5009 AM |
109 | unsigned int sh_link; /* Index of another section */ |
110 | unsigned int sh_info; /* Additional section information */ | |
111 | bfd_vma sh_addralign; /* Section alignment */ | |
252b5132 | 112 | bfd_size_type sh_entsize; /* Entry size if section holds table */ |
252b5132 RH |
113 | |
114 | /* The internal rep also has some cached info associated with it. */ | |
115 | asection * bfd_section; /* Associated BFD section. */ | |
3f1c8673 | 116 | unsigned char *contents; /* Section contents. */ |
252b5132 RH |
117 | } Elf_Internal_Shdr; |
118 | ||
252b5132 RH |
119 | /* Symbol table entry */ |
120 | ||
121 | struct elf_internal_sym { | |
122 | bfd_vma st_value; /* Value of the symbol */ | |
123 | bfd_vma st_size; /* Associated symbol size */ | |
124 | unsigned long st_name; /* Symbol name, index in string tbl */ | |
125 | unsigned char st_info; /* Type and binding attributes */ | |
2b99395a | 126 | unsigned char st_other; /* Visibilty, and target specific */ |
9ad5cbcf | 127 | unsigned int st_shndx; /* Associated section index */ |
252b5132 RH |
128 | }; |
129 | ||
130 | typedef struct elf_internal_sym Elf_Internal_Sym; | |
131 | ||
252b5132 RH |
132 | /* Note segments */ |
133 | ||
134 | typedef struct elf_internal_note { | |
135 | unsigned long namesz; /* Size of entry's owner string */ | |
136 | unsigned long descsz; /* Size of the note descriptor */ | |
137 | unsigned long type; /* Interpretation of the descriptor */ | |
138 | char * namedata; /* Start of the name+desc data */ | |
139 | char * descdata; /* Start of the desc data */ | |
140 | bfd_vma descpos; /* File offset of the descdata */ | |
141 | } Elf_Internal_Note; | |
252b5132 RH |
142 | |
143 | /* Relocation Entries */ | |
144 | ||
252b5132 RH |
145 | typedef struct elf_internal_rela { |
146 | bfd_vma r_offset; /* Location at which to apply the action */ | |
147 | bfd_vma r_info; /* Index and Type of relocation */ | |
6587b929 | 148 | bfd_vma r_addend; /* Constant addend used to compute value */ |
252b5132 RH |
149 | } Elf_Internal_Rela; |
150 | ||
252b5132 RH |
151 | /* dynamic section structure */ |
152 | ||
153 | typedef struct elf_internal_dyn { | |
154 | /* This needs to support 64-bit values in elf64. */ | |
155 | bfd_vma d_tag; /* entry tag value */ | |
156 | union { | |
157 | /* This needs to support 64-bit values in elf64. */ | |
158 | bfd_vma d_val; | |
159 | bfd_vma d_ptr; | |
160 | } d_un; | |
161 | } Elf_Internal_Dyn; | |
162 | ||
252b5132 RH |
163 | /* This structure appears in a SHT_GNU_verdef section. */ |
164 | ||
165 | typedef struct elf_internal_verdef { | |
166 | unsigned short vd_version; /* Version number of structure. */ | |
167 | unsigned short vd_flags; /* Flags (VER_FLG_*). */ | |
168 | unsigned short vd_ndx; /* Version index. */ | |
169 | unsigned short vd_cnt; /* Number of verdaux entries. */ | |
170 | unsigned long vd_hash; /* Hash of name. */ | |
171 | unsigned long vd_aux; /* Offset to verdaux entries. */ | |
172 | unsigned long vd_next; /* Offset to next verdef. */ | |
173 | ||
174 | /* These fields are set up when BFD reads in the structure. FIXME: | |
175 | It would be cleaner to store these in a different structure. */ | |
176 | bfd *vd_bfd; /* BFD. */ | |
177 | const char *vd_nodename; /* Version name. */ | |
178 | struct elf_internal_verdef *vd_nextdef; /* vd_next as pointer. */ | |
179 | struct elf_internal_verdaux *vd_auxptr; /* vd_aux as pointer. */ | |
180 | unsigned int vd_exp_refno; /* Used by the linker. */ | |
181 | } Elf_Internal_Verdef; | |
182 | ||
183 | /* This structure appears in a SHT_GNU_verdef section. */ | |
184 | ||
185 | typedef struct elf_internal_verdaux { | |
186 | unsigned long vda_name; /* String table offset of name. */ | |
187 | unsigned long vda_next; /* Offset to next verdaux. */ | |
188 | ||
189 | /* These fields are set up when BFD reads in the structure. FIXME: | |
190 | It would be cleaner to store these in a different structure. */ | |
191 | const char *vda_nodename; /* vda_name as pointer. */ | |
192 | struct elf_internal_verdaux *vda_nextptr; /* vda_next as pointer. */ | |
193 | } Elf_Internal_Verdaux; | |
194 | ||
195 | /* This structure appears in a SHT_GNU_verneed section. */ | |
196 | ||
197 | typedef struct elf_internal_verneed { | |
198 | unsigned short vn_version; /* Version number of structure. */ | |
199 | unsigned short vn_cnt; /* Number of vernaux entries. */ | |
200 | unsigned long vn_file; /* String table offset of library name. */ | |
201 | unsigned long vn_aux; /* Offset to vernaux entries. */ | |
202 | unsigned long vn_next; /* Offset to next verneed. */ | |
203 | ||
204 | /* These fields are set up when BFD reads in the structure. FIXME: | |
205 | It would be cleaner to store these in a different structure. */ | |
206 | bfd *vn_bfd; /* BFD. */ | |
207 | const char *vn_filename; /* vn_file as pointer. */ | |
208 | struct elf_internal_vernaux *vn_auxptr; /* vn_aux as pointer. */ | |
209 | struct elf_internal_verneed *vn_nextref; /* vn_nextref as pointer. */ | |
210 | } Elf_Internal_Verneed; | |
211 | ||
212 | /* This structure appears in a SHT_GNU_verneed section. */ | |
213 | ||
214 | typedef struct elf_internal_vernaux { | |
215 | unsigned long vna_hash; /* Hash of dependency name. */ | |
216 | unsigned short vna_flags; /* Flags (VER_FLG_*). */ | |
217 | unsigned short vna_other; /* Unused. */ | |
218 | unsigned long vna_name; /* String table offset to version name. */ | |
219 | unsigned long vna_next; /* Offset to next vernaux. */ | |
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 | const char *vna_nodename; /* vna_name as pointer. */ | |
224 | struct elf_internal_vernaux *vna_nextptr; /* vna_next as pointer. */ | |
225 | } Elf_Internal_Vernaux; | |
226 | ||
227 | /* This structure appears in a SHT_GNU_versym section. This is not a | |
228 | standard ELF structure; ELF just uses Elf32_Half. */ | |
229 | ||
230 | typedef struct elf_internal_versym { | |
231 | unsigned short vs_vers; | |
232 | } Elf_Internal_Versym; | |
233 | ||
234 | /* Structure for syminfo section. */ | |
235 | typedef struct | |
236 | { | |
237 | unsigned short int si_boundto; | |
238 | unsigned short int si_flags; | |
239 | } Elf_Internal_Syminfo; | |
240 | ||
eecca0f7 RM |
241 | /* This structure appears on the stack and in NT_AUXV core file notes. */ |
242 | typedef struct | |
243 | { | |
244 | bfd_vma a_type; | |
245 | bfd_vma a_val; | |
246 | } Elf_Internal_Auxv; | |
247 | ||
252b5132 | 248 | |
252b5132 RH |
249 | /* This structure is used to describe how sections should be assigned |
250 | to program segments. */ | |
251 | ||
252 | struct elf_segment_map | |
253 | { | |
254 | /* Next program segment. */ | |
255 | struct elf_segment_map *next; | |
256 | /* Program segment type. */ | |
257 | unsigned long p_type; | |
258 | /* Program segment flags. */ | |
259 | unsigned long p_flags; | |
260 | /* Program segment physical address. */ | |
261 | bfd_vma p_paddr; | |
3271a814 NS |
262 | /* Program segment virtual address offset from section vma. */ |
263 | bfd_vma p_vaddr_offset; | |
3f570048 AM |
264 | /* Program segment alignment. */ |
265 | bfd_vma p_align; | |
b10a8ae0 L |
266 | /* Segment size in file and memory */ |
267 | bfd_vma p_size; | |
2b0bc088 NC |
268 | /* Required size of filehdr + phdrs, if non-zero */ |
269 | bfd_vma header_size; | |
252b5132 RH |
270 | /* Whether the p_flags field is valid; if not, the flags are based |
271 | on the section flags. */ | |
272 | unsigned int p_flags_valid : 1; | |
273 | /* Whether the p_paddr field is valid; if not, the physical address | |
274 | is based on the section lma values. */ | |
275 | unsigned int p_paddr_valid : 1; | |
3f570048 AM |
276 | /* Whether the p_align field is valid; if not, PT_LOAD segment |
277 | alignment is based on the default maximum page size. */ | |
278 | unsigned int p_align_valid : 1; | |
b10a8ae0 L |
279 | /* Whether the p_size field is valid; if not, the size are based |
280 | on the section sizes. */ | |
281 | unsigned int p_size_valid : 1; | |
252b5132 RH |
282 | /* Whether this segment includes the file header. */ |
283 | unsigned int includes_filehdr : 1; | |
284 | /* Whether this segment includes the program headers. */ | |
285 | unsigned int includes_phdrs : 1; | |
286 | /* Number of sections (may be 0). */ | |
287 | unsigned int count; | |
288 | /* Sections. Actual number of elements is in count field. */ | |
289 | asection *sections[1]; | |
290 | }; | |
291 | ||
1224efb8 L |
292 | /* .tbss is special. It doesn't contribute memory space to normal |
293 | segments and it doesn't take file space in normal segments. */ | |
294 | #define ELF_SECTION_SIZE(sec_hdr, segment) \ | |
295 | (((sec_hdr->sh_flags & SHF_TLS) == 0 \ | |
296 | || sec_hdr->sh_type != SHT_NOBITS \ | |
297 | || segment->p_type == PT_TLS) ? sec_hdr->sh_size : 0) | |
298 | ||
299 | /* Decide if the given sec_hdr is in the given segment. PT_TLS segment | |
b10a8ae0 L |
300 | contains only SHF_TLS sections. Only PT_LOAD, PT_GNU_RELRO and |
301 | and PT_TLS segments can contain SHF_TLS sections. */ | |
627b32bc AM |
302 | #define ELF_IS_SECTION_IN_SEGMENT(sec_hdr, segment) \ |
303 | (((((sec_hdr->sh_flags & SHF_TLS) != 0) \ | |
304 | && (segment->p_type == PT_TLS \ | |
b10a8ae0 | 305 | || segment->p_type == PT_GNU_RELRO \ |
627b32bc AM |
306 | || segment->p_type == PT_LOAD)) \ |
307 | || ((sec_hdr->sh_flags & SHF_TLS) == 0 \ | |
9957b18f AM |
308 | && segment->p_type != PT_TLS \ |
309 | && segment->p_type != PT_PHDR)) \ | |
627b32bc AM |
310 | /* Any section besides one of type SHT_NOBITS must have a file \ |
311 | offset within the segment. */ \ | |
312 | && (sec_hdr->sh_type == SHT_NOBITS \ | |
313 | || ((bfd_vma) sec_hdr->sh_offset >= segment->p_offset \ | |
314 | && (sec_hdr->sh_offset + ELF_SECTION_SIZE(sec_hdr, segment) \ | |
315 | <= segment->p_offset + segment->p_filesz))) \ | |
f7bc09bd NS |
316 | /* SHF_ALLOC sections must have VMAs within the segment. Be \ |
317 | careful about segments right at the end of memory. */ \ | |
627b32bc AM |
318 | && ((sec_hdr->sh_flags & SHF_ALLOC) == 0 \ |
319 | || (sec_hdr->sh_addr >= segment->p_vaddr \ | |
f7bc09bd NS |
320 | && (sec_hdr->sh_addr - segment->p_vaddr \ |
321 | + ELF_SECTION_SIZE(sec_hdr, segment) <= segment->p_memsz)))) | |
84d1d650 | 322 | |
1224efb8 L |
323 | /* Decide if the given sec_hdr is in the given segment in file. */ |
324 | #define ELF_IS_SECTION_IN_SEGMENT_FILE(sec_hdr, segment) \ | |
325 | (sec_hdr->sh_size > 0 \ | |
326 | && ELF_IS_SECTION_IN_SEGMENT (sec_hdr, segment)) | |
327 | ||
84d1d650 L |
328 | /* Decide if the given sec_hdr is in the given segment in memory. */ |
329 | #define ELF_IS_SECTION_IN_SEGMENT_MEMORY(sec_hdr, segment) \ | |
1224efb8 L |
330 | (ELF_SECTION_SIZE(sec_hdr, segment) > 0 \ |
331 | && ELF_IS_SECTION_IN_SEGMENT (sec_hdr, segment)) | |
84d1d650 | 332 | |
252b5132 | 333 | #endif /* _ELF_INTERNAL_H */ |