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, 2005, 2006, 2007, 2009  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 3, 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 #define BYTES_IN_WORD 4         /* for now */
  38 #include "bfd/elf-bfd.h"
  39
  40 #include "targ-cpu.h"
  41
  42 #ifdef TC_ALPHA
  43 #define ECOFF_DEBUGGING (alpha_flag_mdebug > 0)
  44 extern int alpha_flag_mdebug;
  45 #endif
  46
  47 /* For now, always set ECOFF_DEBUGGING for a MIPS target.  */
  48 #ifdef TC_MIPS
  49 #define ECOFF_DEBUGGING mips_flag_mdebug
  50 extern int mips_flag_mdebug;
  51 #endif /* TC_MIPS */
  52
  53 #ifdef OBJ_MAYBE_ECOFF
  54 #ifndef ECOFF_DEBUGGING
  55 #define ECOFF_DEBUGGING 1
  56 #endif
  57 #endif
  58
  59 /* Additional information we keep for each symbol.  */
  60 struct elf_obj_sy
  61 {
  62   /* Whether the symbol has been marked as local.  */
  63   int local;
  64
  65   /* Use this to keep track of .size expressions that involve
  66      differences that we can't compute yet.  */
  67   expressionS *size;
  68
  69   /* The name specified by the .symver directive.  */
  70   char *versioned_name;
  71
  72 #ifdef ECOFF_DEBUGGING
  73   /* If we are generating ECOFF debugging information, we need some
  74      additional fields for each symbol.  */
  75   struct efdr *ecoff_file;
  76   struct localsym *ecoff_symbol;
  77   valueT ecoff_extern_size;
  78 #endif
  79 };
  80
  81 #define OBJ_SYMFIELD_TYPE struct elf_obj_sy
  82
  83 /* Symbol fields used by the ELF back end.  */
  84 #define ELF_TARGET_SYMBOL_FIELDS unsigned int local:1;
  85
  86 /* Don't change this; change ELF_TARGET_SYMBOL_FIELDS instead.  */
  87 #ifndef TARGET_SYMBOL_FIELDS
  88 #define TARGET_SYMBOL_FIELDS ELF_TARGET_SYMBOL_FIELDS
  89 #endif
  90
  91 #ifndef FALSE
  92 #define FALSE 0
  93 #define TRUE  !FALSE
  94 #endif
  95
  96 #ifndef obj_begin
  97 #define obj_begin() elf_begin ()
  98 #endif
  99 extern void elf_begin (void);
 100
 101 #ifndef LOCAL_LABEL_PREFIX
 102 #define LOCAL_LABEL_PREFIX '.'
 103 #endif
 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_frob_file
 138 #define obj_frob_file  elf_frob_file
 139 #endif
 140 extern void elf_frob_file (void);
 141
 142 #ifndef obj_frob_file_before_adjust
 143 #define obj_frob_file_before_adjust  elf_frob_file_before_adjust
 144 #endif
 145 extern void elf_frob_file_before_adjust (void);
 146
 147 #ifndef obj_frob_file_after_relocs
 148 #define obj_frob_file_after_relocs  elf_frob_file_after_relocs
 149 #endif
 150 extern void elf_frob_file_after_relocs (void);
 151
 152 /* If the target doesn't have special processing for labels, take care of
 153    dwarf2 output at the object file level.  */
 154 #ifndef tc_frob_label
 155 #include "dwarf2dbg.h"
 156 #define obj_frob_label  dwarf2_emit_label
 157 #endif
 158
 159 #ifndef obj_app_file
 160 #define obj_app_file elf_file_symbol
 161 #endif
 162 extern void elf_file_symbol (const char *, int);
 163
 164 extern void obj_elf_section_change_hook (void);
 165
 166 extern void obj_elf_section (int);
 167 extern char * obj_elf_section_name (void);
 168 extern void obj_elf_previous (int);
 169 extern void obj_elf_version (int);
 170 extern void obj_elf_common (int);
 171 extern void obj_elf_data (int);
 172 extern void obj_elf_text (int);
 173 extern void obj_elf_change_section
 174   (const char *, int, bfd_vma, int, const char *, int, int);
 175 extern struct fix *obj_elf_vtable_inherit (int);
 176 extern struct fix *obj_elf_vtable_entry (int);
 177
 178 /* BFD wants to write the udata field, which is a no-no for the
 179    predefined section symbols in bfd/section.c.  They are read-only.  */
 180 #ifndef obj_sec_sym_ok_for_reloc
 181 #define obj_sec_sym_ok_for_reloc(SEC)   ((SEC)->owner != 0)
 182 #endif
 183
 184 void elf_obj_read_begin_hook (void);
 185 #ifndef obj_read_begin_hook
 186 #define obj_read_begin_hook     elf_obj_read_begin_hook
 187 #endif
 188
 189 void elf_obj_symbol_new_hook (symbolS *);
 190 #ifndef obj_symbol_new_hook
 191 #define obj_symbol_new_hook     elf_obj_symbol_new_hook
 192 #endif
 193
 194 void elf_copy_symbol_attributes (symbolS *, symbolS *);
 195 #ifndef OBJ_COPY_SYMBOL_ATTRIBUTES
 196 #define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 197   (elf_copy_symbol_attributes (DEST, SRC))
 198 #endif
 199
 200 #ifndef SEPARATE_STAB_SECTIONS
 201 /* Avoid ifndef each separate macro setting by wrapping the whole of the
 202    stab group on the assumption that whoever sets SEPARATE_STAB_SECTIONS
 203    caters to ECOFF_DEBUGGING and the right setting of INIT_STAB_SECTIONS
 204    and OBJ_PROCESS_STAB too, without needing the tweaks below.  */
 205
 206 /* Stabs go in a separate section.  */
 207 #define SEPARATE_STAB_SECTIONS 1
 208
 209 /* We need 12 bytes at the start of the section to hold some initial
 210    information.  */
 211 extern void obj_elf_init_stab_section (segT);
 212 #define INIT_STAB_SECTION(seg) obj_elf_init_stab_section (seg)
 213
 214 #ifdef ECOFF_DEBUGGING
 215 /* We smuggle stabs in ECOFF rather than using a separate section.
 216    The Irix linker can not handle a separate stabs section.  */
 217
 218 #undef  SEPARATE_STAB_SECTIONS
 219 #define SEPARATE_STAB_SECTIONS (!ECOFF_DEBUGGING)
 220
 221 #undef  INIT_STAB_SECTION
 222 #define INIT_STAB_SECTION(seg) \
 223   ((void) (ECOFF_DEBUGGING ? 0 : (obj_elf_init_stab_section (seg), 0)))
 224
 225 #undef OBJ_PROCESS_STAB
 226 #define OBJ_PROCESS_STAB(seg, what, string, type, other, desc)          \
 227   if (ECOFF_DEBUGGING)                                                  \
 228     ecoff_stab ((seg), (what), (string), (type), (other), (desc))
 229 #endif /* ECOFF_DEBUGGING */
 230
 231 #endif /* SEPARATE_STAB_SECTIONS not defined.  */
 232
 233 extern void elf_frob_symbol (symbolS *, int *);
 234 #ifndef obj_frob_symbol
 235 #define obj_frob_symbol(symp, punt) elf_frob_symbol (symp, &punt)
 236 #endif
 237
 238 extern void elf_pop_insert (void);
 239 #ifndef obj_pop_insert
 240 #define obj_pop_insert()        elf_pop_insert()
 241 #endif
 242
 243 #ifndef OBJ_MAYBE_ELF
 244 /* If OBJ_MAYBE_ELF then obj-multi.h will define obj_ecoff_set_ext.  */
 245 #define obj_ecoff_set_ext elf_ecoff_set_ext
 246 struct ecoff_extr;
 247 extern void elf_ecoff_set_ext (symbolS *, struct ecoff_extr *);
 248 #endif
 249 extern asection *elf_com_section_ptr;
 250 extern symbolS * elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP,
 251                                    addressT size);
 252
 253 #endif /* _OBJ_ELF_H */