gas/config/obj-elf.h

   1 /* ELF object file format.
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   3    2002, 2003, 2004 Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS 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, or (at your option)
  10    any later version.
  11
  12    GAS 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 GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 /* HP PA-RISC support was contributed by the Center for Software Science
  23    at the University of Utah.  */
  24
  25 #ifndef _OBJ_ELF_H
  26 #define _OBJ_ELF_H
  27
  28 #define OBJ_ELF 1
  29
  30 /* Note that all macros in this file should be wrapped in #ifndef, for
  31    sake of obj-multi.h which includes this file.  */
  32
  33 #ifndef OUTPUT_FLAVOR
  34 #define OUTPUT_FLAVOR bfd_target_elf_flavour
  35 #endif
  36
  37 #include "bfd.h"
  38
  39 #define BYTES_IN_WORD 4         /* for now */
  40 #include "bfd/elf-bfd.h"
  41
  42 #include "targ-cpu.h"
  43
  44 #ifdef TC_ALPHA
  45 #define ECOFF_DEBUGGING (alpha_flag_mdebug > 0)
  46 extern int alpha_flag_mdebug;
  47 #endif
  48
  49 /* For now, always set ECOFF_DEBUGGING for a MIPS target.  */
  50 #ifdef TC_MIPS
  51 #define ECOFF_DEBUGGING mips_flag_mdebug
  52 extern int mips_flag_mdebug;
  53 #endif /* TC_MIPS */
  54
  55 #ifdef OBJ_MAYBE_ECOFF
  56 #ifndef ECOFF_DEBUGGING
  57 #define ECOFF_DEBUGGING 1
  58 #endif
  59 #endif
  60
  61 /* Additional information we keep for each symbol.  */
  62 struct elf_obj_sy
  63 {
  64   /* Whether the symbol has been marked as local.  */
  65   int local;
  66
  67   /* Use this to keep track of .size expressions that involve
  68      differences that we can't compute yet.  */
  69   expressionS *size;
  70
  71   /* The name specified by the .symver directive.  */
  72   char *versioned_name;
  73
  74 #ifdef ECOFF_DEBUGGING
  75   /* If we are generating ECOFF debugging information, we need some
  76      additional fields for each symbol.  */
  77   struct efdr *ecoff_file;
  78   struct localsym *ecoff_symbol;
  79   valueT ecoff_extern_size;
  80 #endif
  81 };
  82
  83 #define OBJ_SYMFIELD_TYPE struct elf_obj_sy
  84
  85 /* Symbol fields used by the ELF back end.  */
  86 #define ELF_TARGET_SYMBOL_FIELDS int local:1;
  87
  88 /* Don't change this; change ELF_TARGET_SYMBOL_FIELDS instead.  */
  89 #ifndef TARGET_SYMBOL_FIELDS
  90 #define TARGET_SYMBOL_FIELDS ELF_TARGET_SYMBOL_FIELDS
  91 #endif
  92
  93 /* #include "targ-cpu.h" */
  94
  95 #ifndef FALSE
  96 #define FALSE 0
  97 #define TRUE  !FALSE
  98 #endif
  99
 100 #ifndef obj_begin
 101 #define obj_begin() elf_begin ()
 102 #endif
 103 extern void elf_begin (void);
 104
 105 /* should be conditional on address size! */
 106 #define elf_symbol(asymbol) ((elf_symbol_type *) (&(asymbol)->the_bfd))
 107
 108 #ifndef S_GET_SIZE
 109 #define S_GET_SIZE(S) \
 110   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size)
 111 #endif
 112 #ifndef S_SET_SIZE
 113 #define S_SET_SIZE(S,V) \
 114   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size = (V))
 115 #endif
 116
 117 #ifndef S_GET_ALIGN
 118 #define S_GET_ALIGN(S) \
 119   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value)
 120 #endif
 121 #ifndef S_SET_ALIGN
 122 #define S_SET_ALIGN(S,V) \
 123   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value = (V))
 124 #endif
 125
 126 int elf_s_get_other (symbolS *);
 127 #ifndef S_GET_OTHER
 128 #define S_GET_OTHER(S)  (elf_s_get_other (S))
 129 #endif
 130 #ifndef S_SET_OTHER
 131 #define S_SET_OTHER(S,V) \
 132   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_other = (V))
 133 #endif
 134
 135 extern asection *gdb_section;
 136
 137 #ifndef obj_sec_set_private_data
 138 #define obj_sec_set_private_data(B, S) \
 139   if (! BFD_SEND ((B), _new_section_hook, ((B), (S)))) \
 140     as_fatal (_("can't allocate ELF private section data: %s"), \
 141               bfd_errmsg (bfd_get_error ()))
 142 #endif
 143
 144 #ifndef obj_frob_file
 145 #define obj_frob_file  elf_frob_file
 146 #endif
 147 extern void elf_frob_file (void);
 148
 149 #ifndef obj_frob_file_before_adjust
 150 #define obj_frob_file_before_adjust  elf_frob_file_before_adjust
 151 #endif
 152 extern void elf_frob_file_before_adjust (void);
 153
 154 #ifndef obj_frob_file_after_relocs
 155 #define obj_frob_file_after_relocs  elf_frob_file_after_relocs
 156 #endif
 157 extern void elf_frob_file_after_relocs (void);
 158
 159 /* If the target doesn't have special processing for labels, take care of
 160    dwarf2 output at the object file level.  */
 161 #ifndef tc_frob_label
 162 #include "dwarf2dbg.h"
 163 #define obj_frob_label  dwarf2_emit_label
 164 #endif
 165
 166 #ifndef obj_app_file
 167 #define obj_app_file elf_file_symbol
 168 #endif
 169 extern void elf_file_symbol (const char *, int);
 170
 171 extern void obj_elf_section_change_hook (void);
 172
 173 extern void obj_elf_section (int);
 174 extern void obj_elf_previous (int);
 175 extern void obj_elf_version (int);
 176 extern void obj_elf_common (int);
 177 extern void obj_elf_data (int);
 178 extern void obj_elf_text (int);
 179 extern void obj_elf_change_section
 180   (const char *, int, int, int, const char *, int, int);
 181 extern struct fix *obj_elf_vtable_inherit (int);
 182 extern struct fix *obj_elf_vtable_entry (int);
 183
 184 /* BFD wants to write the udata field, which is a no-no for the
 185    predefined section symbols in bfd/section.c.  They are read-only.  */
 186 #ifndef obj_sec_sym_ok_for_reloc
 187 #define obj_sec_sym_ok_for_reloc(SEC)   ((SEC)->owner != 0)
 188 #endif
 189
 190 void elf_obj_read_begin_hook (void);
 191 #ifndef obj_read_begin_hook
 192 #define obj_read_begin_hook     elf_obj_read_begin_hook
 193 #endif
 194
 195 void elf_obj_symbol_new_hook (symbolS *);
 196 #ifndef obj_symbol_new_hook
 197 #define obj_symbol_new_hook     elf_obj_symbol_new_hook
 198 #endif
 199
 200 void elf_copy_symbol_attributes (symbolS *, symbolS *);
 201 #ifndef OBJ_COPY_SYMBOL_ATTRIBUTES
 202 #define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 203   (elf_copy_symbol_attributes (DEST, SRC))
 204 #endif
 205
 206 #ifndef SEPARATE_STAB_SECTIONS
 207 /* Avoid ifndef each separate macro setting by wrapping the whole of the
 208    stab group on the assumption that whoever sets SEPARATE_STAB_SECTIONS
 209    caters to ECOFF_DEBUGGING and the right setting of INIT_STAB_SECTIONS
 210    and OBJ_PROCESS_STAB too, without needing the tweaks below.  */
 211
 212 /* Stabs go in a separate section.  */
 213 #define SEPARATE_STAB_SECTIONS 1
 214
 215 /* We need 12 bytes at the start of the section to hold some initial
 216    information.  */
 217 extern void obj_elf_init_stab_section (segT);
 218 #define INIT_STAB_SECTION(seg) obj_elf_init_stab_section (seg)
 219
 220 #ifdef ECOFF_DEBUGGING
 221 /* We smuggle stabs in ECOFF rather than using a separate section.
 222    The Irix linker can not handle a separate stabs section.  */
 223
 224 #undef  SEPARATE_STAB_SECTIONS
 225 #define SEPARATE_STAB_SECTIONS (!ECOFF_DEBUGGING)
 226
 227 #undef  INIT_STAB_SECTION
 228 #define INIT_STAB_SECTION(seg) \
 229   ((void) (ECOFF_DEBUGGING ? 0 : (obj_elf_init_stab_section (seg), 0)))
 230
 231 #undef OBJ_PROCESS_STAB
 232 #define OBJ_PROCESS_STAB(seg, what, string, type, other, desc)          \
 233   if (ECOFF_DEBUGGING)                                                  \
 234     ecoff_stab ((seg), (what), (string), (type), (other), (desc))
 235 #endif /* ECOFF_DEBUGGING */
 236
 237 #endif /* SEPARATE_STAB_SECTIONS not defined.  */
 238
 239 extern void elf_frob_symbol (symbolS *, int *);
 240 #ifndef obj_frob_symbol
 241 #define obj_frob_symbol(symp, punt) elf_frob_symbol (symp, &punt)
 242 #endif
 243
 244 extern void elf_pop_insert (void);
 245 #ifndef obj_pop_insert
 246 #define obj_pop_insert()        elf_pop_insert()
 247 #endif
 248
 249 #ifndef OBJ_MAYBE_ELF
 250 #define obj_ecoff_set_ext elf_ecoff_set_ext
 251 struct ecoff_extr;
 252 extern void elf_ecoff_set_ext (symbolS *, struct ecoff_extr *);
 253 #endif
 254 extern asection *elf_com_section_ptr;
 255 extern symbolS * elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP,
 256                                    addressT size);
 257
 258 #endif /* _OBJ_ELF_H */