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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [include/] [elf/] [internal.h] - Blame information for rev 298

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Line No. Rev Author Line
1 24 jeremybenn
/* ELF support for BFD.
2
   Copyright 1991, 1992, 1993, 1994, 1995, 1997, 1998, 2000, 2001, 2002,
3 225 jeremybenn
   2003, 2006, 2007, 2008 Free Software Foundation, Inc.
4 24 jeremybenn
 
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
 
9
This file is part of BFD, the Binary File Descriptor library.
10
 
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 2 of the License, or
14
(at your option) any later version.
15
 
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.
20
 
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, MA 02110-1301, USA.  */
24
 
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
30
   both the internal and external representations. */
31
 
32
 
33
/* NOTE that these structures are not kept in the same order as they appear
34
   in the object file.  In some cases they've been reordered for more optimal
35
   packing under various circumstances.  */
36
 
37
#ifndef _ELF_INTERNAL_H
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#define _ELF_INTERNAL_H
39
 
40 225 jeremybenn
/* Special section indices, which may show up in st_shndx fields, among
41
   other places.  */
42
 
43
#undef SHN_UNDEF
44
#undef SHN_LORESERVE
45
#undef SHN_LOPROC
46
#undef SHN_HIPROC
47
#undef SHN_LOOS
48
#undef SHN_HIOS
49
#undef SHN_ABS
50
#undef SHN_COMMON
51
#undef SHN_XINDEX
52
#undef SHN_HIRESERVE
53
#define SHN_UNDEF       0                /* Undefined section reference */
54
#define SHN_LORESERVE   (-0x100u)       /* Begin range of reserved indices */
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#define SHN_LOPROC      (-0x100u)       /* Begin range of appl-specific */
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#define SHN_HIPROC      (-0xE1u)        /* End range of appl-specific */
57
#define SHN_LOOS        (-0xE0u)        /* OS specific semantics, lo */
58
#define SHN_HIOS        (-0xC1u)        /* OS specific semantics, hi */
59
#define SHN_ABS         (-0xFu)         /* Associated symbol is absolute */
60
#define SHN_COMMON      (-0xEu)         /* Associated symbol is in common */
61
#define SHN_XINDEX      (-0x1u)         /* Section index is held elsewhere */
62
#define SHN_HIRESERVE   (-0x1u)         /* End range of reserved indices */
63
#define SHN_BAD         (-0x101u)       /* Used internally by bfd */
64
 
65 24 jeremybenn
/* ELF Header */
66
 
67
#define EI_NIDENT       16              /* Size of e_ident[] */
68
 
69
typedef struct elf_internal_ehdr {
70
  unsigned char         e_ident[EI_NIDENT]; /* ELF "magic number" */
71
  bfd_vma               e_entry;        /* Entry point virtual address */
72
  bfd_size_type         e_phoff;        /* Program header table file offset */
73
  bfd_size_type         e_shoff;        /* Section header table file offset */
74
  unsigned long         e_version;      /* Identifies object file version */
75
  unsigned long         e_flags;        /* Processor-specific flags */
76
  unsigned short        e_type;         /* Identifies object file type */
77
  unsigned short        e_machine;      /* Specifies required architecture */
78
  unsigned int          e_ehsize;       /* ELF header size in bytes */
79
  unsigned int          e_phentsize;    /* Program header table entry size */
80
  unsigned int          e_phnum;        /* Program header table entry count */
81
  unsigned int          e_shentsize;    /* Section header table entry size */
82
  unsigned int          e_shnum;        /* Section header table entry count */
83
  unsigned int          e_shstrndx;     /* Section header string table index */
84
} Elf_Internal_Ehdr;
85
 
86
/* Program header */
87
 
88
struct elf_internal_phdr {
89
  unsigned long p_type;                 /* Identifies program segment type */
90
  unsigned long p_flags;                /* Segment flags */
91
  bfd_vma       p_offset;               /* Segment file offset */
92
  bfd_vma       p_vaddr;                /* Segment virtual address */
93
  bfd_vma       p_paddr;                /* Segment physical address */
94
  bfd_vma       p_filesz;               /* Segment size in file */
95
  bfd_vma       p_memsz;                /* Segment size in memory */
96
  bfd_vma       p_align;                /* Segment alignment, file & memory */
97
};
98
 
99
typedef struct elf_internal_phdr Elf_Internal_Phdr;
100
 
101
/* Section header */
102
 
103
typedef struct elf_internal_shdr {
104
  unsigned int  sh_name;                /* Section name, index in string tbl */
105
  unsigned int  sh_type;                /* Type of section */
106
  bfd_vma       sh_flags;               /* Miscellaneous section attributes */
107
  bfd_vma       sh_addr;                /* Section virtual addr at execution */
108 225 jeremybenn
  file_ptr      sh_offset;              /* Section file offset */
109 24 jeremybenn
  bfd_size_type sh_size;                /* Size of section in bytes */
110 225 jeremybenn
  unsigned int  sh_link;                /* Index of another section */
111
  unsigned int  sh_info;                /* Additional section information */
112
  bfd_vma       sh_addralign;           /* Section alignment */
113 24 jeremybenn
  bfd_size_type sh_entsize;             /* Entry size if section holds table */
114
 
115
  /* The internal rep also has some cached info associated with it. */
116
  asection *    bfd_section;            /* Associated BFD section.  */
117
  unsigned char *contents;              /* Section contents.  */
118
} Elf_Internal_Shdr;
119
 
120
/* Symbol table entry */
121
 
122
struct elf_internal_sym {
123
  bfd_vma       st_value;               /* Value of the symbol */
124
  bfd_vma       st_size;                /* Associated symbol size */
125
  unsigned long st_name;                /* Symbol name, index in string tbl */
126
  unsigned char st_info;                /* Type and binding attributes */
127
  unsigned char st_other;               /* Visibilty, and target specific */
128
  unsigned int  st_shndx;               /* Associated section index */
129
};
130
 
131
typedef struct elf_internal_sym Elf_Internal_Sym;
132
 
133
/* Note segments */
134
 
135
typedef struct elf_internal_note {
136
  unsigned long namesz;                 /* Size of entry's owner string */
137
  unsigned long descsz;                 /* Size of the note descriptor */
138
  unsigned long type;                   /* Interpretation of the descriptor */
139
  char *        namedata;               /* Start of the name+desc data */
140
  char *        descdata;               /* Start of the desc data */
141
  bfd_vma       descpos;                /* File offset of the descdata */
142
} Elf_Internal_Note;
143
 
144
/* Relocation Entries */
145
 
146
typedef struct elf_internal_rela {
147
  bfd_vma       r_offset;       /* Location at which to apply the action */
148
  bfd_vma       r_info;         /* Index and Type of relocation */
149
  bfd_vma       r_addend;       /* Constant addend used to compute value */
150
} Elf_Internal_Rela;
151
 
152
/* dynamic section structure */
153
 
154
typedef struct elf_internal_dyn {
155
  /* This needs to support 64-bit values in elf64.  */
156
  bfd_vma d_tag;                /* entry tag value */
157
  union {
158
    /* This needs to support 64-bit values in elf64.  */
159
    bfd_vma     d_val;
160
    bfd_vma     d_ptr;
161
  } d_un;
162
} Elf_Internal_Dyn;
163
 
164
/* This structure appears in a SHT_GNU_verdef section.  */
165
 
166
typedef struct elf_internal_verdef {
167
  unsigned short vd_version;    /* Version number of structure.  */
168
  unsigned short vd_flags;      /* Flags (VER_FLG_*).  */
169
  unsigned short vd_ndx;        /* Version index.  */
170
  unsigned short vd_cnt;        /* Number of verdaux entries.  */
171
  unsigned long  vd_hash;       /* Hash of name.  */
172
  unsigned long  vd_aux;        /* Offset to verdaux entries.  */
173
  unsigned long  vd_next;       /* Offset to next verdef.  */
174
 
175
  /* These fields are set up when BFD reads in the structure.  FIXME:
176
     It would be cleaner to store these in a different structure.  */
177
  bfd                         *vd_bfd;          /* BFD.  */
178
  const char                  *vd_nodename;     /* Version name.  */
179
  struct elf_internal_verdef  *vd_nextdef;      /* vd_next as pointer.  */
180
  struct elf_internal_verdaux *vd_auxptr;       /* vd_aux as pointer.  */
181
  unsigned int                 vd_exp_refno;    /* Used by the linker.  */
182
} Elf_Internal_Verdef;
183
 
184
/* This structure appears in a SHT_GNU_verdef section.  */
185
 
186
typedef struct elf_internal_verdaux {
187
  unsigned long vda_name;       /* String table offset of name.  */
188
  unsigned long vda_next;       /* Offset to next verdaux.  */
189
 
190
  /* These fields are set up when BFD reads in the structure.  FIXME:
191
     It would be cleaner to store these in a different structure.  */
192
  const char *vda_nodename;                     /* vda_name as pointer.  */
193
  struct elf_internal_verdaux *vda_nextptr;     /* vda_next as pointer.  */
194
} Elf_Internal_Verdaux;
195
 
196
/* This structure appears in a SHT_GNU_verneed section.  */
197
 
198
typedef struct elf_internal_verneed {
199
  unsigned short vn_version;    /* Version number of structure.  */
200
  unsigned short vn_cnt;        /* Number of vernaux entries.  */
201
  unsigned long  vn_file;       /* String table offset of library name.  */
202
  unsigned long  vn_aux;        /* Offset to vernaux entries.  */
203
  unsigned long  vn_next;       /* Offset to next verneed.  */
204
 
205
  /* These fields are set up when BFD reads in the structure.  FIXME:
206
     It would be cleaner to store these in a different structure.  */
207
  bfd                         *vn_bfd;          /* BFD.  */
208
  const char                  *vn_filename;     /* vn_file as pointer.  */
209
  struct elf_internal_vernaux *vn_auxptr;       /* vn_aux as pointer.  */
210
  struct elf_internal_verneed *vn_nextref;      /* vn_nextref as pointer.  */
211
} Elf_Internal_Verneed;
212
 
213
/* This structure appears in a SHT_GNU_verneed section.  */
214
 
215
typedef struct elf_internal_vernaux {
216
  unsigned long  vna_hash;      /* Hash of dependency name.  */
217
  unsigned short vna_flags;     /* Flags (VER_FLG_*).  */
218
  unsigned short vna_other;     /* Unused.  */
219
  unsigned long  vna_name;      /* String table offset to version name.  */
220
  unsigned long  vna_next;      /* Offset to next vernaux.  */
221
 
222
  /* These fields are set up when BFD reads in the structure.  FIXME:
223
     It would be cleaner to store these in a different structure.  */
224
  const char                  *vna_nodename;    /* vna_name as pointer.  */
225
  struct elf_internal_vernaux *vna_nextptr;     /* vna_next as pointer.  */
226
} Elf_Internal_Vernaux;
227
 
228
/* This structure appears in a SHT_GNU_versym section.  This is not a
229
   standard ELF structure; ELF just uses Elf32_Half.  */
230
 
231
typedef struct elf_internal_versym {
232
  unsigned short vs_vers;
233
} Elf_Internal_Versym;
234
 
235
/* Structure for syminfo section.  */
236
typedef struct
237
{
238
  unsigned short int    si_boundto;
239
  unsigned short int    si_flags;
240
} Elf_Internal_Syminfo;
241
 
242
/* This structure appears on the stack and in NT_AUXV core file notes.  */
243
typedef struct
244
{
245
  bfd_vma a_type;
246
  bfd_vma a_val;
247
} Elf_Internal_Auxv;
248
 
249
 
250
/* This structure is used to describe how sections should be assigned
251
   to program segments.  */
252
 
253
struct elf_segment_map
254
{
255
  /* Next program segment.  */
256
  struct elf_segment_map *next;
257
  /* Program segment type.  */
258
  unsigned long p_type;
259
  /* Program segment flags.  */
260
  unsigned long p_flags;
261
  /* Program segment physical address.  */
262
  bfd_vma p_paddr;
263
  /* Program segment virtual address offset from section vma.  */
264
  bfd_vma p_vaddr_offset;
265
  /* Program segment alignment.  */
266
  bfd_vma p_align;
267
  /* Segment size in file and memory */
268
  bfd_vma p_size;
269 225 jeremybenn
  /* Required size of filehdr + phdrs, if non-zero */
270
  bfd_vma header_size;
271 24 jeremybenn
  /* Whether the p_flags field is valid; if not, the flags are based
272
     on the section flags.  */
273
  unsigned int p_flags_valid : 1;
274
  /* Whether the p_paddr field is valid; if not, the physical address
275
     is based on the section lma values.  */
276
  unsigned int p_paddr_valid : 1;
277
  /* Whether the p_align field is valid; if not, PT_LOAD segment
278
     alignment is based on the default maximum page size.  */
279
  unsigned int p_align_valid : 1;
280
  /* Whether the p_size field is valid; if not, the size are based
281
     on the section sizes.  */
282
  unsigned int p_size_valid : 1;
283
  /* Whether this segment includes the file header.  */
284
  unsigned int includes_filehdr : 1;
285
  /* Whether this segment includes the program headers.  */
286
  unsigned int includes_phdrs : 1;
287
  /* Number of sections (may be 0).  */
288
  unsigned int count;
289
  /* Sections.  Actual number of elements is in count field.  */
290
  asection *sections[1];
291
};
292
 
293
/* .tbss is special.  It doesn't contribute memory space to normal
294
   segments and it doesn't take file space in normal segments.  */
295
#define ELF_SECTION_SIZE(sec_hdr, segment)                      \
296
   (((sec_hdr->sh_flags & SHF_TLS) == 0                          \
297
     || sec_hdr->sh_type != SHT_NOBITS                          \
298
     || segment->p_type == PT_TLS) ? sec_hdr->sh_size : 0)
299
 
300
/* Decide if the given sec_hdr is in the given segment.  PT_TLS segment
301
   contains only SHF_TLS sections.  Only PT_LOAD, PT_GNU_RELRO and
302
   and PT_TLS segments can contain SHF_TLS sections.  */
303
#define ELF_IS_SECTION_IN_SEGMENT(sec_hdr, segment)                     \
304
  (((((sec_hdr->sh_flags & SHF_TLS) != 0)                                \
305
     && (segment->p_type == PT_TLS                                      \
306
         || segment->p_type == PT_GNU_RELRO                             \
307
         || segment->p_type == PT_LOAD))                                \
308
    || ((sec_hdr->sh_flags & SHF_TLS) == 0                               \
309
        && segment->p_type != PT_TLS))                                  \
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)))              \
316
   /* SHF_ALLOC sections must have VMAs within the segment.  Be         \
317
      careful about segments right at the end of memory.  */            \
318
   && ((sec_hdr->sh_flags & SHF_ALLOC) == 0                              \
319
       || (sec_hdr->sh_addr >= segment->p_vaddr                         \
320
           && (sec_hdr->sh_addr - segment->p_vaddr                      \
321
               + ELF_SECTION_SIZE(sec_hdr, segment) <= segment->p_memsz))))
322
 
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
 
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)      \
330
  (ELF_SECTION_SIZE(sec_hdr, segment) > 0                        \
331
   && ELF_IS_SECTION_IN_SEGMENT (sec_hdr, segment))
332
 
333
#endif /* _ELF_INTERNAL_H */

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