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8c5b4e5228
Lots of fixes for the compatibility code that handles linking of
-mcall-aixdesc code (or that generated by 12 year old gcc) with
current ELFv1 ABI code.
1) A reference to a dot-symbol in an object file wasn't satisfied by a
function descriptor in later object files.
2) The as-needed code had bit-rotted; Shared libs now need a strong
reference to be counted as needed.
3) --gc-sections involving dot-symbols was broken, needing
func_desc_adjust to be run early and lots of other fixes.
bfd/
* elf64-ppc.c (struct ppc_link_hash_entry): Delete "was_undefined".
(struct ppc_link_hash_table): Delete "twiddled_syms". Add
"need_func_desc_adj".
(lookup_fdh): Link direct fdh sym via oh field and set flags.
(make_fdh): Make strong and weak undefined function descriptor
symbols.
(ppc64_elf_merge_symbol): New function.
(elf_backend_merge_symbol): Define.
(ppc64_elf_archive_symbol_lookup): Don't test undefweak for fake
function descriptors.
(add_symbol_adjust): Don't twiddle symbols to undefweak.
Propagate more ref flags to function descriptor symbol. Make
some function descriptor symbols dynamic.
(ppc64_elf_before_check_relocs): Only run add_symbol_adjust for
ELFv1. Set need_func_desc_adj. Don't fix undefs list.
(ppc64_elf_check_relocs): Set non_ir_ref for descriptors.
Don't call lookup_fdh here.
(ppc64_elf_gc_sections): New function.
(bfd_elf64_bfd_gc_sections): Define.
(ppc64_elf_gc_mark_hook): Mark descriptor.
(func_desc_adjust): Don't make fake function descriptor syms strong
here. Exit earlier on non-dotsyms. Take note of elf.dynamic
flag when deciding whether a dynamic function descriptor might
be needed. Transfer elf.dynamic and set elf.needs_plt. Move
plt regardless of visibility. Make descriptor dynamic if
entry sym is dynamic, not for other cases.
(ppc64_elf_func_desc_adjust): Don't run func_desc_adjust if
already done.
(ppc64_elf_edit_opd): Use oh field rather than lookup_fdh.
(ppc64_elf_size_stubs): Likewise.
(ppc_build_one_stub): Don't clear was_undefined. Only set sym
undefweak if stub symbol is defined.
(undo_symbol_twiddle, ppc64_elf_restore_symbols): Delete.
* elf64-ppc.h (ppc64_elf_restore_symbols): Don't declare.
ld/
* emultempl/ppc64elf.em (gld${EMULATION_NAME}_finish): Don't call
ppc64_elf_restore_symbols.
* testsuite/ld-powerpc/dotsym1.d: New.
* testsuite/ld-powerpc/dotsym2.d: New.
* testsuite/ld-powerpc/dotsym3.d: New.
* testsuite/ld-powerpc/dotsym4.d: New.
* testsuite/ld-powerpc/dotsymref.s: New.
* testsuite/ld-powerpc/nodotsym.s: New.
* testsuite/ld-powerpc/powerpc.exp: Run new tests.
97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/* PowerPC64-specific support for 64-bit ELF.
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Copyright (C) 2002-2016 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program 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 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* Used to pass info between ld and bfd. */
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struct ppc64_elf_params
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{
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/* Linker stub bfd. */
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bfd *stub_bfd;
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/* Linker call-backs. */
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asection * (*add_stub_section) (const char *, asection *);
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void (*layout_sections_again) (void);
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/* Maximum size of a group of input sections that can be handled by
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one stub section. A value of +/-1 indicates the bfd back-end
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should use a suitable default size. */
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bfd_signed_vma group_size;
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/* Whether to use a special call stub for __tls_get_addr. */
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int tls_get_addr_opt;
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/* Whether to allow multiple toc sections. */
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int no_multi_toc;
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/* Set if PLT call stubs should load r11. */
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int plt_static_chain;
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/* Set if PLT call stubs need to be thread safe on power7+. */
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int plt_thread_safe;
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/* Set if individual PLT call stubs should be aligned. */
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int plt_stub_align;
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/* Whether to canonicalize .opd so that there are no overlapping
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.opd entries. */
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int non_overlapping_opd;
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/* Whether to emit symbols for stubs. */
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int emit_stub_syms;
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/* Whether to generate out-of-line register save/restore for gcc -Os code. */
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int save_restore_funcs;
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/* Set when a potential variable is detected in .toc. */
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int object_in_toc;
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};
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bfd_boolean ppc64_elf_init_stub_bfd
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(struct bfd_link_info *, struct ppc64_elf_params *);
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bfd_boolean ppc64_elf_edit_opd
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(struct bfd_link_info *);
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asection *ppc64_elf_tls_setup
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(struct bfd_link_info *);
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bfd_boolean ppc64_elf_tls_optimize
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(struct bfd_link_info *);
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bfd_boolean ppc64_elf_edit_toc
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(struct bfd_link_info *);
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bfd_boolean ppc64_elf_has_small_toc_reloc
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(asection *);
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bfd_vma ppc64_elf_set_toc
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(struct bfd_link_info *, bfd *);
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int ppc64_elf_setup_section_lists
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(struct bfd_link_info *);
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void ppc64_elf_start_multitoc_partition
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(struct bfd_link_info *);
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bfd_boolean ppc64_elf_next_toc_section
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(struct bfd_link_info *, asection *);
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bfd_boolean ppc64_elf_layout_multitoc
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(struct bfd_link_info *);
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void ppc64_elf_finish_multitoc_partition
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(struct bfd_link_info *);
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bfd_boolean ppc64_elf_check_init_fini
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(struct bfd_link_info *);
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bfd_boolean ppc64_elf_next_input_section
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(struct bfd_link_info *, asection *);
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bfd_boolean ppc64_elf_size_stubs
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(struct bfd_link_info *);
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bfd_boolean ppc64_elf_build_stubs
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(struct bfd_link_info *, char **);
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