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