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, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 /* HP PA-RISC support was contributed by the Center for Software Science
  24    at the University of Utah.  */
  25
  26 #ifndef _OBJ_ELF_H
  27 #define _OBJ_ELF_H
  28
  29 #define OBJ_ELF 1
  30
  31 /* Note that all macros in this file should be wrapped in #ifndef, for
  32    sake of obj-multi.h which includes this file.  */
  33
  34 #ifndef OUTPUT_FLAVOR
  35 #define OUTPUT_FLAVOR bfd_target_elf_flavour
  36 #endif
  37
  38 #define BYTES_IN_WORD 4         /* for now */
  39 #include "bfd/elf-bfd.h"
  40
  41 #include "targ-cpu.h"
  42
  43 #ifdef TC_ALPHA
  44 #define ECOFF_DEBUGGING (alpha_flag_mdebug > 0)
  45 extern int alpha_flag_mdebug;
  46 #endif
  47
  48 /* For now, always set ECOFF_DEBUGGING for a MIPS target.  */
  49 #ifdef TC_MIPS
  50 #define ECOFF_DEBUGGING mips_flag_mdebug
  51 extern int mips_flag_mdebug;
  52 #endif /* TC_MIPS */
  53
  54 #ifdef OBJ_MAYBE_ECOFF
  55 #ifndef ECOFF_DEBUGGING
  56 #define ECOFF_DEBUGGING 1
  57 #endif
  58 #endif
  59
  60 /* Additional information we keep for each symbol.  */
  61 struct elf_obj_sy
  62 {
  63   /* Whether the symbol has been marked as local.  */
  64   int local;
  65
  66   /* Use this to keep track of .size expressions that involve
  67      differences that we can't compute yet.  */
  68   expressionS *size;
  69
  70   /* The name specified by the .symver directive.  */
  71   char *versioned_name;
  72
  73 #ifdef ECOFF_DEBUGGING
  74   /* If we are generating ECOFF debugging information, we need some
  75      additional fields for each symbol.  */
  76   struct efdr *ecoff_file;
  77   struct localsym *ecoff_symbol;
  78   valueT ecoff_extern_size;
  79 #endif
  80 };
  81
  82 #define OBJ_SYMFIELD_TYPE struct elf_obj_sy
  83
  84 #ifndef FALSE
  85 #define FALSE 0
  86 #define TRUE  !FALSE
  87 #endif
  88
  89 #ifndef obj_begin
  90 #define obj_begin() elf_begin ()
  91 #endif
  92 extern void elf_begin (void);
  93
  94 #ifndef LOCAL_LABEL_PREFIX
  95 #define LOCAL_LABEL_PREFIX '.'
  96 #endif
  97
  98 /* should be conditional on address size! */
  99 #define elf_symbol(asymbol) ((elf_symbol_type *) (&(asymbol)->the_bfd))
 100
 101 #ifndef S_GET_SIZE
 102 #define S_GET_SIZE(S) \
 103   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size)
 104 #endif
 105 #ifndef S_SET_SIZE
 106 #define S_SET_SIZE(S,V) \
 107   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size = (V))
 108 #endif
 109
 110 #ifndef S_GET_ALIGN
 111 #define S_GET_ALIGN(S) \
 112   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value)
 113 #endif
 114 #ifndef S_SET_ALIGN
 115 #define S_SET_ALIGN(S,V) \
 116   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value = (V))
 117 #endif
 118
 119 int elf_s_get_other (symbolS *);
 120 #ifndef S_GET_OTHER
 121 #define S_GET_OTHER(S)  (elf_s_get_other (S))
 122 #endif
 123 #ifndef S_SET_OTHER
 124 #define S_SET_OTHER(S,V) \
 125   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_other = (V))
 126 #endif
 127
 128 extern asection *gdb_section;
 129
 130 #ifndef obj_frob_file
 131 #define obj_frob_file  elf_frob_file
 132 #endif
 133 extern void elf_frob_file (void);
 134
 135 #ifndef obj_frob_file_before_adjust
 136 #define obj_frob_file_before_adjust  elf_frob_file_before_adjust
 137 #endif
 138 extern void elf_frob_file_before_adjust (void);
 139
 140 #ifndef obj_frob_file_after_relocs
 141 #define obj_frob_file_after_relocs  elf_frob_file_after_relocs
 142 #endif
 143 extern void elf_frob_file_after_relocs (void);
 144
 145 /* If the target doesn't have special processing for labels, take care of
 146    dwarf2 output at the object file level.  */
 147 #ifndef tc_frob_label
 148 #include "dwarf2dbg.h"
 149 #define obj_frob_label  dwarf2_emit_label
 150 #endif
 151
 152 #ifndef obj_app_file
 153 #define obj_app_file elf_file_symbol
 154 #endif
 155 extern void elf_file_symbol (const char *, int);
 156
 157 extern void obj_elf_section_change_hook (void);
 158
 159 extern void obj_elf_section (int);
 160 extern char * obj_elf_section_name (void);
 161 extern void obj_elf_previous (int);
 162 extern void obj_elf_version (int);
 163 extern void obj_elf_common (int);
 164 extern void obj_elf_data (int);
 165 extern void obj_elf_text (int);
 166 extern void obj_elf_change_section
 167   (const char *, int, bfd_vma, int, const char *, int, int);
 168 extern struct fix *obj_elf_vtable_inherit (int);
 169 extern struct fix *obj_elf_vtable_entry (int);
 170
 171 /* BFD wants to write the udata field, which is a no-no for the
 172    predefined section symbols in bfd/section.c.  They are read-only.  */
 173 #ifndef obj_sec_sym_ok_for_reloc
 174 #define obj_sec_sym_ok_for_reloc(SEC)   ((SEC)->owner != 0)
 175 #endif
 176
 177 void elf_obj_read_begin_hook (void);
 178 #ifndef obj_read_begin_hook
 179 #define obj_read_begin_hook     elf_obj_read_begin_hook
 180 #endif
 181
 182 void elf_obj_symbol_new_hook (symbolS *);
 183 #ifndef obj_symbol_new_hook
 184 #define obj_symbol_new_hook     elf_obj_symbol_new_hook
 185 #endif
 186
 187 void elf_copy_symbol_attributes (symbolS *, symbolS *);
 188 #ifndef OBJ_COPY_SYMBOL_ATTRIBUTES
 189 #define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 190   (elf_copy_symbol_attributes (DEST, SRC))
 191 #endif
 192
 193 void elf_adjust_symtab (void);
 194 #ifndef obj_adjust_symtab
 195 #define obj_adjust_symtab       elf_adjust_symtab
 196 #endif
 197
 198 #ifndef SEPARATE_STAB_SECTIONS
 199 /* Avoid ifndef each separate macro setting by wrapping the whole of the
 200    stab group on the assumption that whoever sets SEPARATE_STAB_SECTIONS
 201    caters to ECOFF_DEBUGGING and the right setting of INIT_STAB_SECTIONS
 202    and OBJ_PROCESS_STAB too, without needing the tweaks below.  */
 203
 204 /* Stabs go in a separate section.  */
 205 #define SEPARATE_STAB_SECTIONS 1
 206
 207 /* We need 12 bytes at the start of the section to hold some initial
 208    information.  */
 209 extern void obj_elf_init_stab_section (segT);
 210 #define INIT_STAB_SECTION(seg) obj_elf_init_stab_section (seg)
 211
 212 #ifdef ECOFF_DEBUGGING
 213 /* We smuggle stabs in ECOFF rather than using a separate section.
 214    The Irix linker can not handle a separate stabs section.  */
 215
 216 #undef  SEPARATE_STAB_SECTIONS
 217 #define SEPARATE_STAB_SECTIONS (!ECOFF_DEBUGGING)
 218
 219 #undef  INIT_STAB_SECTION
 220 #define INIT_STAB_SECTION(seg) \
 221   ((void) (ECOFF_DEBUGGING ? 0 : (obj_elf_init_stab_section (seg), 0)))
 222
 223 #undef OBJ_PROCESS_STAB
 224 #define OBJ_PROCESS_STAB(seg, what, string, type, other, desc)          \
 225   if (ECOFF_DEBUGGING)                                                  \
 226     ecoff_stab ((seg), (what), (string), (type), (other), (desc))
 227 #endif /* ECOFF_DEBUGGING */
 228
 229 #endif /* SEPARATE_STAB_SECTIONS not defined.  */
 230
 231 extern void elf_frob_symbol (symbolS *, int *);
 232 #ifndef obj_frob_symbol
 233 #define obj_frob_symbol(symp, punt) elf_frob_symbol (symp, &punt)
 234 #endif
 235
 236 extern void elf_pop_insert (void);
 237 #ifndef obj_pop_insert
 238 #define obj_pop_insert()        elf_pop_insert()
 239 #endif
 240
 241 #ifndef OBJ_MAYBE_ELF
 242 /* If OBJ_MAYBE_ELF then obj-multi.h will define obj_ecoff_set_ext.  */
 243 #define obj_ecoff_set_ext elf_ecoff_set_ext
 244 struct ecoff_extr;
 245 extern void elf_ecoff_set_ext (symbolS *, struct ecoff_extr *);
 246 #endif
 247 extern asection *elf_com_section_ptr;
 248 extern symbolS * elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP,
 249                                    addressT size);
 250
 251 #endif /* _OBJ_ELF_H */