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6914be53bd
Extend .symver directive to update visibility of the original symbol and assign one original symbol to different versioned symbols: .symver foo, foo@VERS_1, local # Change foo to a local symbol. .symver foo, foo@VERS_2, hidden # Change foo to a hidden symbol. .symver foo, foo@@VERS_3, remove # Remove foo from symbol table. .symver foo, bar@V1 # Assign foo to bar@V1 and baz@V2. .symver foo, baz@V2 PR gas/23840 PR gas/25295 * NEWS: Mention .symver extension. * config/obj-elf.c (obj_elf_find_and_add_versioned_name): New function. (obj_elf_symver): Call obj_elf_find_and_add_versioned_name to add a version name. Add local, hidden and remove visibility support. (elf_frob_symbol): Handle the list of version names. Update the original symbol to local, hidden or remove it from the symbol table. (elf_frob_file_before_adjust): Handle the list of version names. * config/obj-elf.h (elf_visibility): New. (elf_versioned_name_list): Likewise. (elf_obj_sy): Change local to bitfield. Add rename, bad_version and visibility. Change versioned_name pointer to struct elf_versioned_name_list. * doc/as.texi: Update .symver directive. * testsuite/gas/symver/symver.exp: Run all *.d tests. Add more error checking tests. * testsuite/gas/symver/symver6.d: New file. * testsuite/gas/symver/symver7.d: Likewise. * testsuite/gas/symver/symver7.s: Likewise. * testsuite/gas/symver/symver8.d: Likewise. * testsuite/gas/symver/symver8.s: Likewise. * testsuite/gas/symver/symver9.s: Likewise. * testsuite/gas/symver/symver9a.d: Likewise. * testsuite/gas/symver/symver9b.d: Likewise. * testsuite/gas/symver/symver10.s: Likewise. * testsuite/gas/symver/symver10a.d: Likewise. * testsuite/gas/symver/symver10b.d: Likewise. * testsuite/gas/symver/symver11.d: Likewise. * testsuite/gas/symver/symver11.s: Likewise. * testsuite/gas/symver/symver12.d: Likewise. * testsuite/gas/symver/symver12.s: Likewise. * testsuite/gas/symver/symver13.d: Likewise. * testsuite/gas/symver/symver13.s: Likewise. * testsuite/gas/symver/symver14.d: Likewise. * testsuite/gas/symver/symver14.l: Likewise. * testsuite/gas/symver/symver15.d: Likewise. * testsuite/gas/symver/symver15.l: Likewise. * testsuite/gas/symver/symver6.l: Removed. * testsuite/gas/symver/symver6.s: Updated.
290 lines
8.1 KiB
C
290 lines
8.1 KiB
C
/* ELF object file format.
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Copyright (C) 1992-2020 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* HP PA-RISC support was contributed by the Center for Software Science
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at the University of Utah. */
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#ifndef _OBJ_ELF_H
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#define _OBJ_ELF_H
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#define OBJ_ELF 1
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/* Note that all macros in this file should be wrapped in #ifndef, for
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sake of obj-multi.h which includes this file. */
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#ifndef OUTPUT_FLAVOR
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#define OUTPUT_FLAVOR bfd_target_elf_flavour
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#endif
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#define BYTES_IN_WORD 4 /* for now */
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#include "bfd/elf-bfd.h"
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#include "targ-cpu.h"
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#ifdef TC_ALPHA
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#define ECOFF_DEBUGGING (alpha_flag_mdebug > 0)
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extern int alpha_flag_mdebug;
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#endif
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/* For now, always set ECOFF_DEBUGGING for a MIPS target. */
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#ifdef TC_MIPS
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#define ECOFF_DEBUGGING mips_flag_mdebug
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extern int mips_flag_mdebug;
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#endif /* TC_MIPS */
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#ifdef OBJ_MAYBE_ECOFF
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#ifndef ECOFF_DEBUGGING
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#define ECOFF_DEBUGGING 1
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#endif
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#endif
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enum elf_visibility
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{
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visibility_unchanged = 0,
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visibility_local,
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visibility_hidden,
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visibility_remove
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};
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struct elf_versioned_name_list
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{
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char *name;
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struct elf_versioned_name_list *next;
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};
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/* Additional information we keep for each symbol. */
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struct elf_obj_sy
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{
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/* Whether the symbol has been marked as local. */
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unsigned int local : 1;
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/* Whether the symbol has been marked for rename with @@@. */
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unsigned int rename : 1;
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/* Whether the symbol has a bad version name. */
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unsigned int bad_version : 1;
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/* Whether visibility of the symbol should be changed. */
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ENUM_BITFIELD (elf_visibility) visibility : 2;
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/* Use this to keep track of .size expressions that involve
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differences that we can't compute yet. */
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expressionS *size;
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/* The list of names specified by the .symver directive. */
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struct elf_versioned_name_list *versioned_name;
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#ifdef ECOFF_DEBUGGING
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/* If we are generating ECOFF debugging information, we need some
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additional fields for each symbol. */
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struct efdr *ecoff_file;
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struct localsym *ecoff_symbol;
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valueT ecoff_extern_size;
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#endif
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};
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/* Match section group name, the sh_info field and the section_id
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field. */
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struct elf_section_match
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{
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const char *group_name;
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const char *linked_to_symbol_name;
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unsigned int info;
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unsigned int section_id;
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flagword flags;
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};
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#define OBJ_SYMFIELD_TYPE struct elf_obj_sy
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#ifndef FALSE
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#define FALSE 0
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#define TRUE !FALSE
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#endif
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#ifndef obj_begin
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#define obj_begin() elf_begin ()
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#endif
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extern void elf_begin (void);
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#ifndef LOCAL_LABEL_PREFIX
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#define LOCAL_LABEL_PREFIX '.'
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#endif
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/* should be conditional on address size! */
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#define elf_symbol(asymbol) ((elf_symbol_type *) (&(asymbol)->the_bfd))
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#ifndef S_GET_SIZE
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#define S_GET_SIZE(S) \
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(elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size)
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#endif
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#ifndef S_SET_SIZE
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#define S_SET_SIZE(S,V) \
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(elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size = (V))
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#endif
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#ifndef S_GET_ALIGN
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#define S_GET_ALIGN(S) \
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(elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value)
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#endif
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#ifndef S_SET_ALIGN
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#define S_SET_ALIGN(S,V) \
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(elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value = (V))
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#endif
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int elf_s_get_other (symbolS *);
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#ifndef S_GET_OTHER
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#define S_GET_OTHER(S) (elf_s_get_other (S))
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#endif
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#ifndef S_SET_OTHER
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#define S_SET_OTHER(S,V) \
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(elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_other = (V))
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#endif
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extern asection *gdb_section;
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#ifndef obj_frob_file
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#define obj_frob_file elf_frob_file
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#endif
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extern void elf_frob_file (void);
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#ifndef obj_frob_file_before_adjust
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#define obj_frob_file_before_adjust elf_frob_file_before_adjust
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#endif
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extern void elf_frob_file_before_adjust (void);
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#ifndef obj_frob_file_after_relocs
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#define obj_frob_file_after_relocs elf_frob_file_after_relocs
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#endif
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extern void elf_frob_file_after_relocs (void);
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/* If the target doesn't have special processing for labels, take care of
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dwarf2 output at the object file level. */
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#ifndef tc_frob_label
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#include "dwarf2dbg.h"
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#define obj_frob_label dwarf2_emit_label
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#endif
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#ifndef obj_app_file
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#define obj_app_file elf_file_symbol
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#endif
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extern void elf_file_symbol (const char *, int);
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extern void obj_elf_section_change_hook (void);
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extern void obj_elf_section (int);
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extern const char * obj_elf_section_name (void);
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extern void obj_elf_previous (int);
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extern void obj_elf_version (int);
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extern void obj_elf_common (int);
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extern void obj_elf_data (int);
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extern void obj_elf_text (int);
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extern void obj_elf_change_section
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(const char *, unsigned int, bfd_vma, int, struct elf_section_match *,
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int, int);
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extern void obj_elf_vtable_inherit (int);
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extern void obj_elf_vtable_entry (int);
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extern struct fix * obj_elf_get_vtable_inherit (void);
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extern struct fix * obj_elf_get_vtable_entry (void);
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extern bfd_boolean obj_elf_seen_attribute
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(int, unsigned int);
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extern int obj_elf_vendor_attribute (int);
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/* BFD wants to write the udata field, which is a no-no for the
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predefined section symbols in bfd/section.c. They are read-only. */
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#ifndef obj_sec_sym_ok_for_reloc
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#define obj_sec_sym_ok_for_reloc(SEC) ((SEC)->owner != 0)
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#endif
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void elf_obj_read_begin_hook (void);
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#ifndef obj_read_begin_hook
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#define obj_read_begin_hook elf_obj_read_begin_hook
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#endif
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void elf_obj_symbol_new_hook (symbolS *);
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#ifndef obj_symbol_new_hook
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#define obj_symbol_new_hook elf_obj_symbol_new_hook
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#endif
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void elf_copy_symbol_attributes (symbolS *, symbolS *);
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#ifndef OBJ_COPY_SYMBOL_ATTRIBUTES
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#define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
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(elf_copy_symbol_attributes (DEST, SRC))
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#endif
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void elf_adjust_symtab (void);
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#ifndef obj_adjust_symtab
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#define obj_adjust_symtab elf_adjust_symtab
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#endif
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#ifndef SEPARATE_STAB_SECTIONS
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/* Avoid ifndef each separate macro setting by wrapping the whole of the
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stab group on the assumption that whoever sets SEPARATE_STAB_SECTIONS
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caters to ECOFF_DEBUGGING and the right setting of INIT_STAB_SECTIONS
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and OBJ_PROCESS_STAB too, without needing the tweaks below. */
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/* Stabs go in a separate section. */
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#define SEPARATE_STAB_SECTIONS 1
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/* We need 12 bytes at the start of the section to hold some initial
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information. */
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extern void obj_elf_init_stab_section (segT);
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#define INIT_STAB_SECTION(seg) obj_elf_init_stab_section (seg)
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#ifdef ECOFF_DEBUGGING
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/* We smuggle stabs in ECOFF rather than using a separate section.
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The Irix linker can not handle a separate stabs section. */
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#undef SEPARATE_STAB_SECTIONS
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#define SEPARATE_STAB_SECTIONS (!ECOFF_DEBUGGING)
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#undef INIT_STAB_SECTION
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#define INIT_STAB_SECTION(seg) \
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((void) (ECOFF_DEBUGGING ? 0 : (obj_elf_init_stab_section (seg), 0)))
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#undef OBJ_PROCESS_STAB
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#define OBJ_PROCESS_STAB(seg, what, string, type, other, desc) \
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if (ECOFF_DEBUGGING) \
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ecoff_stab ((seg), (what), (string), (type), (other), (desc))
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#endif /* ECOFF_DEBUGGING */
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#endif /* SEPARATE_STAB_SECTIONS not defined. */
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extern void elf_frob_symbol (symbolS *, int *);
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#ifndef obj_frob_symbol
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#define obj_frob_symbol(symp, punt) elf_frob_symbol (symp, &punt)
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#endif
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extern void elf_pop_insert (void);
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#ifndef obj_pop_insert
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#define obj_pop_insert() elf_pop_insert()
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#endif
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#ifndef OBJ_MAYBE_ELF
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/* If OBJ_MAYBE_ELF then obj-multi.h will define obj_ecoff_set_ext. */
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#define obj_ecoff_set_ext elf_ecoff_set_ext
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struct ecoff_extr;
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extern void elf_ecoff_set_ext (symbolS *, struct ecoff_extr *);
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#endif
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extern asection *elf_com_section_ptr;
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extern symbolS * elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP,
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addressT size);
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#endif /* _OBJ_ELF_H */
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