gas/config/obj-elf.h

   1 /* ELF object file format.
   2    Copyright (C) 1992-2020 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 enum elf_visibility
  59 {
  60   visibility_unchanged = 0,
  61   visibility_local,
  62   visibility_hidden,
  63   visibility_remove
  64 };
  65
  66 struct elf_versioned_name_list
  67 {
  68   char *name;
  69   struct elf_versioned_name_list *next;
  70 };
  71
  72 /* Additional information we keep for each symbol.  */
  73 struct elf_obj_sy
  74 {
  75   /* Whether the symbol has been marked as local.  */
  76   unsigned int local : 1;
  77
  78   /* Whether the symbol has been marked for rename with @@@.  */
  79   unsigned int rename : 1;
  80
  81   /* Whether the symbol has a bad version name.  */
  82   unsigned int bad_version : 1;
  83
  84   /* Whether visibility of the symbol should be changed.  */
  85   ENUM_BITFIELD (elf_visibility) visibility : 2;
  86
  87   /* Use this to keep track of .size expressions that involve
  88      differences that we can't compute yet.  */
  89   expressionS *size;
  90
  91   /* The list of names specified by the .symver directive.  */
  92   struct elf_versioned_name_list *versioned_name;
  93
  94 #ifdef ECOFF_DEBUGGING
  95   /* If we are generating ECOFF debugging information, we need some
  96      additional fields for each symbol.  */
  97   struct efdr *ecoff_file;
  98   struct localsym *ecoff_symbol;
  99   valueT ecoff_extern_size;
 100 #endif
 101 };
 102
 103 /* Match section group name, the sh_info field and the section_id
 104    field.  */
 105 struct elf_section_match
 106 {
 107   const char *group_name;
 108   const char *linked_to_symbol_name;
 109   unsigned int info;
 110   unsigned int section_id;
 111   flagword flags;
 112 };
 113
 114 #define OBJ_SYMFIELD_TYPE struct elf_obj_sy
 115
 116 #ifndef FALSE
 117 #define FALSE 0
 118 #define TRUE  !FALSE
 119 #endif
 120
 121 #ifndef obj_begin
 122 #define obj_begin() elf_begin ()
 123 #endif
 124 extern void elf_begin (void);
 125
 126 #ifndef LOCAL_LABEL_PREFIX
 127 #define LOCAL_LABEL_PREFIX '.'
 128 #endif
 129
 130 /* should be conditional on address size! */
 131 #define elf_symbol(asymbol) ((elf_symbol_type *) (&(asymbol)->the_bfd))
 132
 133 #ifndef S_GET_SIZE
 134 #define S_GET_SIZE(S) \
 135   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size)
 136 #endif
 137 #ifndef S_SET_SIZE
 138 #define S_SET_SIZE(S,V) \
 139   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size = (V))
 140 #endif
 141
 142 #ifndef S_GET_ALIGN
 143 #define S_GET_ALIGN(S) \
 144   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value)
 145 #endif
 146 #ifndef S_SET_ALIGN
 147 #define S_SET_ALIGN(S,V) \
 148   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value = (V))
 149 #endif
 150
 151 int elf_s_get_other (symbolS *);
 152 #ifndef S_GET_OTHER
 153 #define S_GET_OTHER(S)  (elf_s_get_other (S))
 154 #endif
 155 #ifndef S_SET_OTHER
 156 #define S_SET_OTHER(S,V) \
 157   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_other = (V))
 158 #endif
 159
 160 extern asection *gdb_section;
 161
 162 #ifndef obj_frob_file
 163 #define obj_frob_file  elf_frob_file
 164 #endif
 165 extern void elf_frob_file (void);
 166
 167 #ifndef obj_frob_file_before_adjust
 168 #define obj_frob_file_before_adjust  elf_frob_file_before_adjust
 169 #endif
 170 extern void elf_frob_file_before_adjust (void);
 171
 172 #ifndef obj_frob_file_after_relocs
 173 #define obj_frob_file_after_relocs  elf_frob_file_after_relocs
 174 #endif
 175 extern void elf_frob_file_after_relocs (void);
 176
 177 /* If the target doesn't have special processing for labels, take care of
 178    dwarf2 output at the object file level.  */
 179 #ifndef tc_frob_label
 180 #include "dwarf2dbg.h"
 181 #define obj_frob_label  dwarf2_emit_label
 182 #endif
 183
 184 #ifndef obj_app_file
 185 #define obj_app_file elf_file_symbol
 186 #endif
 187 extern void elf_file_symbol (const char *, int);
 188
 189 extern void obj_elf_section_change_hook (void);
 190
 191 extern void obj_elf_section (int);
 192 extern const char * obj_elf_section_name (void);
 193 extern void obj_elf_previous (int);
 194 extern void obj_elf_version (int);
 195 extern void obj_elf_common (int);
 196 extern void obj_elf_data (int);
 197 extern void obj_elf_text (int);
 198 extern void obj_elf_change_section
 199   (const char *, unsigned int, bfd_vma, int, struct elf_section_match *,
 200    int, int);
 201 extern void obj_elf_vtable_inherit (int);
 202 extern void obj_elf_vtable_entry (int);
 203 extern struct fix * obj_elf_get_vtable_inherit (void);
 204 extern struct fix * obj_elf_get_vtable_entry (void);
 205 extern bfd_boolean obj_elf_seen_attribute
 206   (int, unsigned int);
 207 extern int obj_elf_vendor_attribute (int);
 208
 209 /* BFD wants to write the udata field, which is a no-no for the
 210    predefined section symbols in bfd/section.c.  They are read-only.  */
 211 #ifndef obj_sec_sym_ok_for_reloc
 212 #define obj_sec_sym_ok_for_reloc(SEC)   ((SEC)->owner != 0)
 213 #endif
 214
 215 void elf_obj_read_begin_hook (void);
 216 #ifndef obj_read_begin_hook
 217 #define obj_read_begin_hook     elf_obj_read_begin_hook
 218 #endif
 219
 220 void elf_obj_symbol_new_hook (symbolS *);
 221 #ifndef obj_symbol_new_hook
 222 #define obj_symbol_new_hook     elf_obj_symbol_new_hook
 223 #endif
 224
 225 void elf_copy_symbol_attributes (symbolS *, symbolS *);
 226 #ifndef OBJ_COPY_SYMBOL_ATTRIBUTES
 227 #define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 228   (elf_copy_symbol_attributes (DEST, SRC))
 229 #endif
 230
 231 void elf_adjust_symtab (void);
 232 #ifndef obj_adjust_symtab
 233 #define obj_adjust_symtab       elf_adjust_symtab
 234 #endif
 235
 236 #ifndef SEPARATE_STAB_SECTIONS
 237 /* Avoid ifndef each separate macro setting by wrapping the whole of the
 238    stab group on the assumption that whoever sets SEPARATE_STAB_SECTIONS
 239    caters to ECOFF_DEBUGGING and the right setting of INIT_STAB_SECTIONS
 240    and OBJ_PROCESS_STAB too, without needing the tweaks below.  */
 241
 242 /* Stabs go in a separate section.  */
 243 #define SEPARATE_STAB_SECTIONS 1
 244
 245 /* We need 12 bytes at the start of the section to hold some initial
 246    information.  */
 247 extern void obj_elf_init_stab_section (segT);
 248 #define INIT_STAB_SECTION(seg) obj_elf_init_stab_section (seg)
 249
 250 #ifdef ECOFF_DEBUGGING
 251 /* We smuggle stabs in ECOFF rather than using a separate section.
 252    The Irix linker can not handle a separate stabs section.  */
 253
 254 #undef  SEPARATE_STAB_SECTIONS
 255 #define SEPARATE_STAB_SECTIONS (!ECOFF_DEBUGGING)
 256
 257 #undef  INIT_STAB_SECTION
 258 #define INIT_STAB_SECTION(seg) \
 259   ((void) (ECOFF_DEBUGGING ? 0 : (obj_elf_init_stab_section (seg), 0)))
 260
 261 #undef OBJ_PROCESS_STAB
 262 #define OBJ_PROCESS_STAB(seg, what, string, type, other, desc)          \
 263   if (ECOFF_DEBUGGING)                                                  \
 264     ecoff_stab ((seg), (what), (string), (type), (other), (desc))
 265 #endif /* ECOFF_DEBUGGING */
 266
 267 #endif /* SEPARATE_STAB_SECTIONS not defined.  */
 268
 269 extern void elf_frob_symbol (symbolS *, int *);
 270 #ifndef obj_frob_symbol
 271 #define obj_frob_symbol(symp, punt) elf_frob_symbol (symp, &punt)
 272 #endif
 273
 274 extern void elf_pop_insert (void);
 275 #ifndef obj_pop_insert
 276 #define obj_pop_insert()        elf_pop_insert()
 277 #endif
 278
 279 #ifndef OBJ_MAYBE_ELF
 280 /* If OBJ_MAYBE_ELF then obj-multi.h will define obj_ecoff_set_ext.  */
 281 #define obj_ecoff_set_ext elf_ecoff_set_ext
 282 struct ecoff_extr;
 283 extern void elf_ecoff_set_ext (symbolS *, struct ecoff_extr *);
 284 #endif
 285 extern asection *elf_com_section_ptr;
 286 extern symbolS * elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP,
 287                                    addressT size);
 288
 289 #endif /* _OBJ_ELF_H */