1/* ELF object file format. 2 Copyright (C) 1992-2022 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) 43extern 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 49extern 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 58enum elf_visibility 59{ 60 visibility_unchanged = 0, 61 visibility_local, 62 visibility_hidden, 63 visibility_remove 64}; 65 66struct 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. */ 73struct 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. */ 105struct elf_section_match 106{ 107 const char * group_name; 108 const char * linked_to_symbol_name; 109 unsigned int section_id; 110 unsigned int sh_info; /* ELF section information. */ 111 bfd_vma sh_flags; /* ELF section flags. */ 112 flagword flags; 113}; 114 115#define OBJ_SYMFIELD_TYPE struct elf_obj_sy 116 117#ifndef obj_begin 118#define obj_begin() elf_begin () 119#endif 120extern void elf_begin (void); 121 122#ifndef LOCAL_LABEL_PREFIX 123#define LOCAL_LABEL_PREFIX '.' 124#endif 125 126/* should be conditional on address size! */ 127#define elf_symbol(asymbol) ((elf_symbol_type *) (&(asymbol)->the_bfd)) 128 129#ifndef S_GET_SIZE 130#define S_GET_SIZE(S) \ 131 (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size) 132#endif 133#ifndef S_SET_SIZE 134#define S_SET_SIZE(S,V) \ 135 (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size = (V)) 136#endif 137 138#ifndef S_GET_ALIGN 139#define S_GET_ALIGN(S) \ 140 (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value) 141#endif 142#ifndef S_SET_ALIGN 143#define S_SET_ALIGN(S,V) \ 144 (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value = (V)) 145#endif 146 147int elf_s_get_other (symbolS *); 148#ifndef S_GET_OTHER 149#define S_GET_OTHER(S) (elf_s_get_other (S)) 150#endif 151#ifndef S_SET_OTHER 152#define S_SET_OTHER(S,V) \ 153 (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_other = (V)) 154#endif 155 156extern asection *gdb_section; 157 158#ifndef obj_frob_file 159#define obj_frob_file elf_frob_file 160#endif 161extern void elf_frob_file (void); 162 163#ifndef obj_frob_file_before_adjust 164#define obj_frob_file_before_adjust elf_frob_file_before_adjust 165#endif 166extern void elf_frob_file_before_adjust (void); 167 168#ifndef obj_frob_file_after_relocs 169#define obj_frob_file_after_relocs elf_frob_file_after_relocs 170#endif 171extern void elf_frob_file_after_relocs (void); 172 173/* If the target doesn't have special processing for labels, take care of 174 dwarf2 output at the object file level. */ 175#ifndef tc_frob_label 176#include "dwarf2dbg.h" 177#define obj_frob_label dwarf2_emit_label 178#endif 179 180#ifndef obj_app_file 181#define obj_app_file elf_file_symbol 182#endif 183extern void elf_file_symbol (const char *); 184 185extern void obj_elf_section_change_hook (void); 186 187extern void obj_elf_section (int); 188extern const char * obj_elf_section_name (void); 189extern void obj_elf_previous (int); 190extern void obj_elf_version (int); 191extern void obj_elf_common (int); 192extern void obj_elf_bss (int); 193extern void obj_elf_data (int); 194extern void obj_elf_text (int); 195extern void obj_elf_change_section 196 (const char *, unsigned int, bfd_vma, int, struct elf_section_match *, 197 int, int); 198extern void obj_elf_vtable_inherit (int); 199extern void obj_elf_vtable_entry (int); 200extern struct fix * obj_elf_get_vtable_inherit (void); 201extern struct fix * obj_elf_get_vtable_entry (void); 202extern bool obj_elf_seen_attribute 203 (int, unsigned int); 204extern int obj_elf_vendor_attribute (int); 205 206/* BFD wants to write the udata field, which is a no-no for the 207 predefined section symbols in bfd/section.c. They are read-only. */ 208#ifndef obj_sec_sym_ok_for_reloc 209#define obj_sec_sym_ok_for_reloc(SEC) ((SEC)->owner != 0) 210#endif 211 212void elf_obj_read_begin_hook (void); 213#ifndef obj_read_begin_hook 214#define obj_read_begin_hook elf_obj_read_begin_hook 215#endif 216 217void elf_obj_symbol_new_hook (symbolS *); 218#ifndef obj_symbol_new_hook 219#define obj_symbol_new_hook elf_obj_symbol_new_hook 220#endif 221 222void elf_obj_symbol_clone_hook (symbolS *, symbolS *); 223#ifndef obj_symbol_clone_hook 224#define obj_symbol_clone_hook elf_obj_symbol_clone_hook 225#endif 226 227void elf_copy_symbol_attributes (symbolS *, symbolS *); 228#ifndef OBJ_COPY_SYMBOL_ATTRIBUTES 229#define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ 230 (elf_copy_symbol_attributes (DEST, SRC)) 231#endif 232 233void elf_adjust_symtab (void); 234#ifndef obj_adjust_symtab 235#define obj_adjust_symtab elf_adjust_symtab 236#endif 237 238#ifndef SEPARATE_STAB_SECTIONS 239/* Avoid ifndef each separate macro setting by wrapping the whole of the 240 stab group on the assumption that whoever sets SEPARATE_STAB_SECTIONS 241 caters to ECOFF_DEBUGGING and the right setting of INIT_STAB_SECTIONS 242 and OBJ_PROCESS_STAB too, without needing the tweaks below. */ 243 244/* Stabs go in a separate section. */ 245#define SEPARATE_STAB_SECTIONS 1 246 247/* We need 12 bytes at the start of the section to hold some initial 248 information. */ 249extern void obj_elf_init_stab_section (segT); 250#define INIT_STAB_SECTION(seg) obj_elf_init_stab_section (seg) 251 252#ifdef ECOFF_DEBUGGING 253/* We smuggle stabs in ECOFF rather than using a separate section. 254 The Irix linker can not handle a separate stabs section. */ 255 256#undef SEPARATE_STAB_SECTIONS 257#define SEPARATE_STAB_SECTIONS (!ECOFF_DEBUGGING) 258 259#undef INIT_STAB_SECTION 260#define INIT_STAB_SECTION(seg) \ 261 ((void) (ECOFF_DEBUGGING ? 0 : (obj_elf_init_stab_section (seg), 0))) 262 263#undef OBJ_PROCESS_STAB 264#define OBJ_PROCESS_STAB(seg, what, string, type, other, desc) \ 265 if (ECOFF_DEBUGGING) \ 266 ecoff_stab ((seg), (what), (string), (type), (other), (desc)) 267#endif /* ECOFF_DEBUGGING */ 268 269#endif /* SEPARATE_STAB_SECTIONS not defined. */ 270 271extern void elf_frob_symbol (symbolS *, int *); 272#ifndef obj_frob_symbol 273#define obj_frob_symbol(symp, punt) elf_frob_symbol (symp, &punt) 274#endif 275 276extern void elf_fixup_removed_symbol (symbolS **); 277#ifndef obj_fixup_removed_symbol 278#define obj_fixup_removed_symbol(sympp) elf_fixup_removed_symbol (sympp) 279#endif 280 281extern void elf_pop_insert (void); 282#ifndef obj_pop_insert 283#define obj_pop_insert() elf_pop_insert() 284#endif 285 286#ifndef OBJ_MAYBE_ELF 287/* If OBJ_MAYBE_ELF then obj-multi.h will define obj_ecoff_set_ext. */ 288#define obj_ecoff_set_ext elf_ecoff_set_ext 289struct ecoff_extr; 290extern void elf_ecoff_set_ext (symbolS *, struct ecoff_extr *); 291#endif 292extern asection *elf_com_section_ptr; 293extern symbolS * elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP, 294 addressT size); 295 296#endif /* _OBJ_ELF_H */ 297