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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [include/] [elf/] [internal.h] - Blame information for rev 834

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1 227 jeremybenn
/* ELF support for BFD.
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   Copyright 1991, 1992, 1993, 1994, 1995, 1997, 1998, 2000, 2001, 2002,
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   2003, 2006, 2007, 2008 Free Software Foundation, Inc.
4
 
5
   Written by Fred Fish @ Cygnus Support, from information published
6
   in "UNIX System V Release 4, Programmers Guide: ANSI C and
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   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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
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/* This file is part of ELF support for BFD, and contains the portions
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   that describe how ELF is represented internally in the BFD library.
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   I.E. it describes the in-memory representation of ELF.  It requires
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   the elf-common.h file which contains the portions that are common to
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   both the internal and external representations. */
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32
 
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/* NOTE that these structures are not kept in the same order as they appear
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   in the object file.  In some cases they've been reordered for more optimal
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   packing under various circumstances.  */
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#ifndef _ELF_INTERNAL_H
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#define _ELF_INTERNAL_H
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/* Special section indices, which may show up in st_shndx fields, among
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   other places.  */
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#undef SHN_UNDEF
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#undef SHN_LORESERVE
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#undef SHN_LOPROC
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#undef SHN_HIPROC
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#undef SHN_LOOS
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#undef SHN_HIOS
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#undef SHN_ABS
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#undef SHN_COMMON
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#undef SHN_XINDEX
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#undef SHN_HIRESERVE
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#define SHN_UNDEF       0                /* Undefined section reference */
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#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 */
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#define SHN_LOOS        (-0xE0u)        /* OS specific semantics, lo */
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#define SHN_HIOS        (-0xC1u)        /* OS specific semantics, hi */
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#define SHN_ABS         (-0xFu)         /* Associated symbol is absolute */
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#define SHN_COMMON      (-0xEu)         /* Associated symbol is in common */
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#define SHN_XINDEX      (-0x1u)         /* Section index is held elsewhere */
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#define SHN_HIRESERVE   (-0x1u)         /* End range of reserved indices */
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#define SHN_BAD         (-0x101u)       /* Used internally by bfd */
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/* ELF Header */
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#define EI_NIDENT       16              /* Size of e_ident[] */
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typedef struct elf_internal_ehdr {
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  unsigned char         e_ident[EI_NIDENT]; /* ELF "magic number" */
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  bfd_vma               e_entry;        /* Entry point virtual address */
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  bfd_size_type         e_phoff;        /* Program header table file offset */
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  bfd_size_type         e_shoff;        /* Section header table file offset */
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  unsigned long         e_version;      /* Identifies object file version */
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  unsigned long         e_flags;        /* Processor-specific flags */
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  unsigned short        e_type;         /* Identifies object file type */
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  unsigned short        e_machine;      /* Specifies required architecture */
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  unsigned int          e_ehsize;       /* ELF header size in bytes */
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  unsigned int          e_phentsize;    /* Program header table entry size */
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  unsigned int          e_phnum;        /* Program header table entry count */
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  unsigned int          e_shentsize;    /* Section header table entry size */
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  unsigned int          e_shnum;        /* Section header table entry count */
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  unsigned int          e_shstrndx;     /* Section header string table index */
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} Elf_Internal_Ehdr;
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86
/* Program header */
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88
struct elf_internal_phdr {
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  unsigned long p_type;                 /* Identifies program segment type */
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  unsigned long p_flags;                /* Segment flags */
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  bfd_vma       p_offset;               /* Segment file offset */
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  bfd_vma       p_vaddr;                /* Segment virtual address */
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  bfd_vma       p_paddr;                /* Segment physical address */
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  bfd_vma       p_filesz;               /* Segment size in file */
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  bfd_vma       p_memsz;                /* Segment size in memory */
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  bfd_vma       p_align;                /* Segment alignment, file & memory */
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};
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99
typedef struct elf_internal_phdr Elf_Internal_Phdr;
100
 
101
/* Section header */
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103
typedef struct elf_internal_shdr {
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  unsigned int  sh_name;                /* Section name, index in string tbl */
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  unsigned int  sh_type;                /* Type of section */
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  bfd_vma       sh_flags;               /* Miscellaneous section attributes */
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  bfd_vma       sh_addr;                /* Section virtual addr at execution */
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  file_ptr      sh_offset;              /* Section file offset */
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  bfd_size_type sh_size;                /* Size of section in bytes */
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  unsigned int  sh_link;                /* Index of another section */
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  unsigned int  sh_info;                /* Additional section information */
112
  bfd_vma       sh_addralign;           /* Section alignment */
113
  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 */
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  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.  */
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  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
  /* Required size of filehdr + phdrs, if non-zero */
270
  bfd_vma header_size;
271
  /* 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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