gas/config/obj-elf.h

   1 /* ELF object file format.
   2    Copyright (C) 1992-2017 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 /* HP PA-RISC support was contributed by the Center for Software Science
  22    at the University of Utah.  */
  23
  24 #ifndef _OBJ_ELF_H
  25 #define _OBJ_ELF_H
  26
  27 #define OBJ_ELF 1
  28
  29 /* Note that all macros in this file should be wrapped in #ifndef, for
  30    sake of obj-multi.h which includes this file.  */
  31
  32 #ifndef OUTPUT_FLAVOR
  33 #define OUTPUT_FLAVOR bfd_target_elf_flavour
  34 #endif
  35
  36 #define BYTES_IN_WORD 4         /* for now */
  37 #include "bfd/elf-bfd.h"
  38
  39 #include "targ-cpu.h"
  40
  41 #ifdef TC_ALPHA
  42 #define ECOFF_DEBUGGING (alpha_flag_mdebug > 0)
  43 extern int alpha_flag_mdebug;
  44 #endif
  45
  46 /* For now, always set ECOFF_DEBUGGING for a MIPS target.  */
  47 #ifdef TC_MIPS
  48 #define ECOFF_DEBUGGING mips_flag_mdebug
  49 extern int mips_flag_mdebug;
  50 #endif /* TC_MIPS */
  51
  52 #ifdef OBJ_MAYBE_ECOFF
  53 #ifndef ECOFF_DEBUGGING
  54 #define ECOFF_DEBUGGING 1
  55 #endif
  56 #endif
  57
  58 /* Additional information we keep for each symbol.  */
  59 struct elf_obj_sy
  60 {
  61   /* Whether the symbol has been marked as local.  */
  62   int local;
  63
  64   /* Use this to keep track of .size expressions that involve
  65      differences that we can't compute yet.  */
  66   expressionS *size;
  67
  68   /* The name specified by the .symver directive.  */
  69   char *versioned_name;
  70
  71 #ifdef ECOFF_DEBUGGING
  72   /* If we are generating ECOFF debugging information, we need some
  73      additional fields for each symbol.  */
  74   struct efdr *ecoff_file;
  75   struct localsym *ecoff_symbol;
  76   valueT ecoff_extern_size;
  77 #endif
  78 };
  79
  80 #define OBJ_SYMFIELD_TYPE struct elf_obj_sy
  81
  82 #ifndef FALSE
  83 #define FALSE 0
  84 #define TRUE  !FALSE
  85 #endif
  86
  87 #ifndef obj_begin
  88 #define obj_begin() elf_begin ()
  89 #endif
  90 extern void elf_begin (void);
  91
  92 #ifndef LOCAL_LABEL_PREFIX
  93 #define LOCAL_LABEL_PREFIX '.'
  94 #endif
  95
  96 /* should be conditional on address size! */
  97 #define elf_symbol(asymbol) ((elf_symbol_type *) (&(asymbol)->the_bfd))
  98
  99 #ifndef S_GET_SIZE
 100 #define S_GET_SIZE(S) \
 101   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size)
 102 #endif
 103 #ifndef S_SET_SIZE
 104 #define S_SET_SIZE(S,V) \
 105   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size = (V))
 106 #endif
 107
 108 #ifndef S_GET_ALIGN
 109 #define S_GET_ALIGN(S) \
 110   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value)
 111 #endif
 112 #ifndef S_SET_ALIGN
 113 #define S_SET_ALIGN(S,V) \
 114   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value = (V))
 115 #endif
 116
 117 int elf_s_get_other (symbolS *);
 118 #ifndef S_GET_OTHER
 119 #define S_GET_OTHER(S)  (elf_s_get_other (S))
 120 #endif
 121 #ifndef S_SET_OTHER
 122 #define S_SET_OTHER(S,V) \
 123   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_other = (V))
 124 #endif
 125
 126 extern asection *gdb_section;
 127
 128 #ifndef obj_frob_file
 129 #define obj_frob_file  elf_frob_file
 130 #endif
 131 extern void elf_frob_file (void);
 132
 133 #ifndef obj_frob_file_before_adjust
 134 #define obj_frob_file_before_adjust  elf_frob_file_before_adjust
 135 #endif
 136 extern void elf_frob_file_before_adjust (void);
 137
 138 #ifndef obj_frob_file_after_relocs
 139 #define obj_frob_file_after_relocs  elf_frob_file_after_relocs
 140 #endif
 141 extern void elf_frob_file_after_relocs (void);
 142
 143 /* If the target doesn't have special processing for labels, take care of
 144    dwarf2 output at the object file level.  */
 145 #ifndef tc_frob_label
 146 #include "dwarf2dbg.h"
 147 #define obj_frob_label  dwarf2_emit_label
 148 #endif
 149
 150 #ifndef obj_app_file
 151 #define obj_app_file elf_file_symbol
 152 #endif
 153 extern void elf_file_symbol (const char *, int);
 154
 155 extern void obj_elf_section_change_hook (void);
 156
 157 extern void obj_elf_section (int);
 158 extern const char * obj_elf_section_name (void);
 159 extern void obj_elf_previous (int);
 160 extern void obj_elf_version (int);
 161 extern void obj_elf_common (int);
 162 extern void obj_elf_data (int);
 163 extern void obj_elf_text (int);
 164 extern void obj_elf_change_section
 165   (const char *, unsigned int, unsigned int, bfd_vma, int, const char *,
 166    int, int);
 167 extern struct fix *obj_elf_vtable_inherit (int);
 168 extern struct fix *obj_elf_vtable_entry (int);
 169 extern bfd_boolean obj_elf_seen_attribute
 170   (int, unsigned int);
 171 extern int obj_elf_vendor_attribute (int);
 172
 173 /* BFD wants to write the udata field, which is a no-no for the
 174    predefined section symbols in bfd/section.c.  They are read-only.  */
 175 #ifndef obj_sec_sym_ok_for_reloc
 176 #define obj_sec_sym_ok_for_reloc(SEC)   ((SEC)->owner != 0)
 177 #endif
 178
 179 void elf_obj_read_begin_hook (void);
 180 #ifndef obj_read_begin_hook
 181 #define obj_read_begin_hook     elf_obj_read_begin_hook
 182 #endif
 183
 184 void elf_obj_symbol_new_hook (symbolS *);
 185 #ifndef obj_symbol_new_hook
 186 #define obj_symbol_new_hook     elf_obj_symbol_new_hook
 187 #endif
 188
 189 void elf_copy_symbol_attributes (symbolS *, symbolS *);
 190 #ifndef OBJ_COPY_SYMBOL_ATTRIBUTES
 191 #define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 192   (elf_copy_symbol_attributes (DEST, SRC))
 193 #endif
 194
 195 void elf_adjust_symtab (void);
 196 #ifndef obj_adjust_symtab
 197 #define obj_adjust_symtab       elf_adjust_symtab
 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 */