bfd/libelf.h

   1 /* BFD back-end data structures for ELF files.
   2    Copyright (C) 1992, 1993 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #ifndef _LIBELF_H_
  22 #define _LIBELF_H_ 1
  23
  24 #include "elf/common.h"
  25 #include "elf/internal.h"
  26 #include "elf/external.h"
  27
  28 /* If size isn't specified as 64 or 32, NAME macro should fail.  */
  29 #ifndef NAME
  30 #if ARCH_SIZE==64
  31 #define NAME(x,y) CAT4(x,64,_,y)
  32 #endif
  33 #if ARCH_SIZE==32
  34 #define NAME(x,y) CAT4(x,32,_,y)
  35 #endif
  36 #endif
  37
  38 #define ElfNAME(X)      NAME(Elf,X)
  39 #define elfNAME(X)      NAME(elf,X)
  40
  41 typedef struct
  42 {
  43   asymbol symbol;
  44   Elf_Internal_Sym internal_elf_sym;
  45   /* these are used for the generation of .stabX symbols (?) */
  46   short desc;
  47   unsigned char type;
  48   char other;
  49   union
  50     {
  51       unsigned int hppa_arg_reloc;
  52       PTR any;
  53     }
  54   tc_data;
  55   Elf32_External_Sym native_elf_sym;
  56 } elf32_symbol_type;
  57
  58 typedef struct
  59 {
  60   asymbol symbol;
  61   Elf_Internal_Sym internal_elf_sym;
  62   /* these are used for the generation of .stabX symbols (?) */
  63   short desc;
  64   unsigned char type;
  65   char other;
  66   union
  67     {
  68       unsigned int hppa_arg_reloc;
  69       PTR any;
  70     }
  71   tc_data;
  72   Elf64_External_Sym native_elf_sym;
  73 } elf64_symbol_type;
  74
  75 struct elf_backend_data
  76 {
  77   int use_rela_p;
  78   int elf_64_p;
  79   enum bfd_architecture arch;
  80   void (*elf_info_to_howto) PARAMS ((bfd *, arelent *,
  81                                      Elf_Internal_Rela *));
  82   void (*elf_info_to_howto_rel) PARAMS ((bfd *, arelent *,
  83                                          Elf_Internal_Rel *));
  84   void (*write_relocs) PARAMS ((bfd *, asection *, PTR));
  85
  86   /* @@ I really don't think this should be here.  I don't know what
  87      global_sym is supposed to be used for, but I doubt it's something
  88      that would be considered global, e.g., if you've got a program
  89      reading and writing many BFDs.  My hunch is that it's specific to
  90      the output BFD.  If not, put a comment here explaining why.  */
  91   /* @@ Was pointer to elfNAME(symbol_type).  This makes it size-
  92      independent.  */
  93   PTR global_sym;
  94 };
  95
  96 struct bfd_elf_arch_map {
  97   enum bfd_architecture bfd_arch;
  98   int elf_arch;
  99 };
 100
 101 extern const struct bfd_elf_arch_map bfd_elf_arch_map[];
 102 extern const int bfd_elf_arch_map_size;
 103
 104 struct bfd_elf_section_data {
 105   Elf_Internal_Shdr this_hdr;
 106   Elf_Internal_Shdr rel_hdr;
 107   int this_idx, rel_idx;
 108 #if 0
 109   Elf_Internal_Shdr str_hdr;
 110   int str_idx;
 111 #endif
 112 };
 113 #define elf_section_data(sec)  ((struct bfd_elf_section_data*)sec->used_by_bfd)
 114 #define shdr_name(abfd,shdr)    (elf_shstrtab (abfd)->tab + (shdr)->sh_name)
 115
 116 #define get_elf_backend_data(abfd) \
 117   ((struct elf_backend_data *) (abfd)->xvec->backend_data)
 118
 119 struct strtab
 120 {
 121   char *tab;
 122   int nentries;
 123   int length;
 124 };
 125
 126 /* Some private data is stashed away for future use using the tdata pointer
 127    in the bfd structure.  */
 128
 129 struct elf_obj_tdata
 130 {
 131   Elf_Internal_Ehdr elf_header[1];      /* Actual data, but ref like ptr */
 132   Elf_Internal_Shdr **elf_sect_ptr;
 133   struct strtab *strtab_ptr;
 134   int num_locals;
 135   int num_globals;
 136   int *symtab_map;
 137   PTR raw_syms;                 /* Elf_External_Sym* */
 138   Elf_Internal_Sym *internal_syms;
 139   PTR symbols;                  /* elf_symbol_type */
 140 /*  struct strtab *shstrtab;*/
 141   Elf_Internal_Shdr symtab_hdr;
 142   Elf_Internal_Shdr shstrtab_hdr;
 143   Elf_Internal_Shdr strtab_hdr;
 144   int symtab_section, shstrtab_section, strtab_section;
 145   file_ptr next_file_pos;
 146   void *prstatus;               /* The raw /proc prstatus structure */
 147   void *prpsinfo;               /* The raw /proc prpsinfo structure */
 148 };
 149
 150 #define elf_tdata(bfd)          ((bfd) -> tdata.elf_obj_data)
 151 #define elf_elfheader(bfd)      (elf_tdata(bfd) -> elf_header)
 152 #define elf_elfsections(bfd)    (elf_tdata(bfd) -> elf_sect_ptr)
 153 #define elf_shstrtab(bfd)       (elf_tdata(bfd) -> strtab_ptr)
 154 #define elf_onesymtab(bfd)      (elf_tdata(bfd) -> symtab_section)
 155 #define elf_num_locals(bfd)     (elf_tdata(bfd) -> num_locals)
 156 #define elf_num_globals(bfd)    (elf_tdata(bfd) -> num_globals)
 157 #define elf_symtab_map(bfd)     (elf_tdata(bfd) -> symtab_map)
 158 #define core_prpsinfo(bfd)      (elf_tdata(bfd) -> prpsinfo)
 159 #define core_prstatus(bfd)      (elf_tdata(bfd) -> prstatus)
 160 #define obj_symbols(bfd)        ((elf_symbol_type*)(elf_tdata(bfd) -> symbols))
 161 #define obj_raw_syms(bfd)       ((Elf_External_Sym*)(elf_tdata(bfd) -> raw_syms))
 162 #define obj_internal_syms(bfd)  (elf_tdata(bfd) -> internal_syms)
 163
 164 extern char * elf_string_from_elf_section PARAMS ((bfd *, unsigned, unsigned));
 165 extern char * elf_get_str_section PARAMS ((bfd *, unsigned));
 166
 167 #define bfd_elf32_mkobject      bfd_elf_mkobject
 168 #define bfd_elf64_mkobject      bfd_elf_mkobject
 169 #define elf_mkobject            bfd_elf_mkobject
 170
 171 extern unsigned long elf_hash PARAMS ((CONST unsigned char *));
 172
 173 extern bfd_reloc_status_type bfd_elf_generic_reloc PARAMS ((bfd *,
 174                                                             arelent *,
 175                                                             asymbol *,
 176                                                             PTR,
 177                                                             asection *,
 178                                                             bfd *));
 179 extern boolean bfd_elf_mkobject PARAMS ((bfd *));
 180 extern boolean bfd_elf32_write_object_contents PARAMS ((bfd *));
 181 extern boolean bfd_elf64_write_object_contents PARAMS ((bfd *));
 182
 183 extern bfd_target *bfd_elf32_object_p PARAMS ((bfd *));
 184 extern bfd_target *bfd_elf32_core_file_p PARAMS ((bfd *));
 185 extern char *bfd_elf32_core_file_failing_command PARAMS ((bfd *));
 186 extern int bfd_elf32_core_file_failing_signal PARAMS ((bfd *));
 187 extern boolean bfd_elf32_core_file_matches_executable_p PARAMS ((bfd *,
 188                                                                  bfd *));
 189 extern boolean bfd_elf32_set_section_contents PARAMS ((bfd *, sec_ptr, PTR,
 190                                                        file_ptr,
 191                                                        bfd_size_type));
 192
 193 extern unsigned int bfd_elf32_get_symtab_upper_bound PARAMS ((bfd *));
 194 extern unsigned int bfd_elf32_get_symtab PARAMS ((bfd *, asymbol **));
 195 extern unsigned int bfd_elf32_get_reloc_upper_bound PARAMS ((bfd *, sec_ptr));
 196 extern unsigned int bfd_elf32_canonicalize_reloc PARAMS ((bfd *, sec_ptr,
 197                                                           arelent **,
 198                                                           asymbol **));
 199 extern asymbol *bfd_elf32_make_empty_symbol PARAMS ((bfd *));
 200 extern void bfd_elf32_print_symbol PARAMS ((bfd *, PTR, asymbol *,
 201                                             bfd_print_symbol_type));
 202 extern void bfd_elf32_get_symbol_info PARAMS ((bfd *, asymbol *,
 203                                                symbol_info *));
 204 extern alent *bfd_elf32_get_lineno PARAMS ((bfd *, asymbol *));
 205 extern boolean bfd_elf32_set_arch_mach PARAMS ((bfd *, enum bfd_architecture,
 206                                                 unsigned long));
 207 extern boolean bfd_elf32_find_nearest_line PARAMS ((bfd *, asection *,
 208                                                     asymbol **,
 209                                                     bfd_vma, CONST char **,
 210                                                     CONST char **,
 211                                                     unsigned int *));
 212 extern int bfd_elf32_sizeof_headers PARAMS ((bfd *, boolean));
 213 extern void bfd_elf32__write_relocs PARAMS ((bfd *, asection *, PTR));
 214 extern boolean bfd_elf32_new_section_hook PARAMS ((bfd *, asection *));
 215
 216 /* If the target doesn't have reloc handling written yet:  */
 217 extern void bfd_elf32_no_info_to_howto PARAMS ((bfd *, arelent *,
 218                                                 Elf32_Internal_Rela *));
 219
 220 extern bfd_target *bfd_elf64_object_p PARAMS ((bfd *));
 221 extern bfd_target *bfd_elf64_core_file_p PARAMS ((bfd *));
 222 extern char *bfd_elf64_core_file_failing_command PARAMS ((bfd *));
 223 extern int bfd_elf64_core_file_failing_signal PARAMS ((bfd *));
 224 extern boolean bfd_elf64_core_file_matches_executable_p PARAMS ((bfd *,
 225                                                                  bfd *));
 226 extern boolean bfd_elf64_set_section_contents PARAMS ((bfd *, sec_ptr, PTR,
 227                                                        file_ptr,
 228                                                        bfd_size_type));
 229
 230 extern unsigned int bfd_elf64_get_symtab_upper_bound PARAMS ((bfd *));
 231 extern unsigned int bfd_elf64_get_symtab PARAMS ((bfd *, asymbol **));
 232 extern unsigned int bfd_elf64_get_reloc_upper_bound PARAMS ((bfd *, sec_ptr));
 233 extern unsigned int bfd_elf64_canonicalize_reloc PARAMS ((bfd *, sec_ptr,
 234                                                           arelent **,
 235                                                           asymbol **));
 236 extern asymbol *bfd_elf64_make_empty_symbol PARAMS ((bfd *));
 237 extern void bfd_elf64_print_symbol PARAMS ((bfd *, PTR, asymbol *,
 238                                             bfd_print_symbol_type));
 239 extern void bfd_elf64_get_symbol_info PARAMS ((bfd *, asymbol *,
 240                                                symbol_info *));
 241 extern alent *bfd_elf64_get_lineno PARAMS ((bfd *, asymbol *));
 242 extern boolean bfd_elf64_set_arch_mach PARAMS ((bfd *, enum bfd_architecture,
 243                                                 unsigned long));
 244 extern boolean bfd_elf64_find_nearest_line PARAMS ((bfd *, asection *,
 245                                                     asymbol **,
 246                                                     bfd_vma, CONST char **,
 247                                                     CONST char **,
 248                                                     unsigned int *));
 249 extern int bfd_elf64_sizeof_headers PARAMS ((bfd *, boolean));
 250 extern void bfd_elf64__write_relocs PARAMS ((bfd *, asection *, PTR));
 251 extern boolean bfd_elf64_new_section_hook PARAMS ((bfd *, asection *));
 252
 253 /* If the target doesn't have reloc handling written yet:  */
 254 extern void bfd_elf64_no_info_to_howto PARAMS ((bfd *, arelent *,
 255                                                 Elf64_Internal_Rela *));
 256
 257 #endif /* _LIBELF_H_ */