From 6cabe1ea460c54c17ac877b2541eccf91d6b4b9c Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Fri, 12 Dec 2014 22:53:46 +1030 Subject: Copy relocations against protected symbols Copy relocs are used in a scheme to avoid dynamic text relocations in non-PIC executables that refer to variables defined in shared libraries. The idea is to have the linker define any such variable in the executable, with a copy reloc copying the initial value, then have both the executable and shared library refer to the executable copy. If the shared library defines the variable as protected then we have two copies of the variable being used. PR 15228 * elflink.c (_bfd_elf_adjust_dynamic_copy): Add "info" param. Error on copy relocs against protected symbols. (elf_merge_st_other): Set h->protected_def. * elf-bfd.h (struct elf_link_hash_entry): Add "protected_def". (_bfd_elf_adjust_dynamic_copy): Update prototype. * elf-m10300.c (_bfd_mn10300_elf_adjust_dynamic_symbol): Update _bfd_elf_adjust_dynamic_copy call. * elf32-arm.c (elf32_arm_adjust_dynamic_symbol): Likewise. * elf32-cr16.c (_bfd_cr16_elf_adjust_dynamic_symbol): Likewise. * elf32-cris.c (elf_cris_adjust_dynamic_symbol): Likewise. * elf32-hppa.c (elf32_hppa_adjust_dynamic_symbol): Likewise. * elf32-i370.c (i370_elf_adjust_dynamic_symbol): Likewise. * elf32-i386.c (elf_i386_adjust_dynamic_symbol): Likewise. * elf32-lm32.c (lm32_elf_adjust_dynamic_symbol): Likewise. * elf32-m32r.c (m32r_elf_adjust_dynamic_symbol): Likewise. * elf32-m68k.c (elf_m68k_adjust_dynamic_symbol): Likewise. * elf32-metag.c (elf_metag_adjust_dynamic_symbol): Likewise. * elf32-or1k.c (or1k_elf_adjust_dynamic_symbol): Likewise. * elf32-ppc.c (ppc_elf_adjust_dynamic_symbol): Likewise. * elf32-s390.c (elf_s390_adjust_dynamic_symbol): Likewise. * elf32-sh.c (sh_elf_adjust_dynamic_symbol): Likewise. * elf32-tic6x.c (elf32_tic6x_adjust_dynamic_symbol): Likewise. * elf32-tilepro.c (tilepro_elf_adjust_dynamic_symbol): Likewise. * elf32-vax.c (elf_vax_adjust_dynamic_symbol): Likewise. * elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol): Likewise. * elf64-s390.c (elf_s390_adjust_dynamic_symbol): Likewise. * elf64-sh64.c (sh64_elf64_adjust_dynamic_symbol): Likewise. * elf64-x86-64.c (elf_x86_64_adjust_dynamic_symbol): Likewise. * elfnn-aarch64.c (elfNN_aarch64_adjust_dynamic_symbol): Likewise. * elfxx-mips.c (_bfd_mips_elf_adjust_dynamic_symbol): Likewise. * elfxx-sparc.c (_bfd_sparc_elf_adjust_dynamic_symbol): Likewise. * elfxx-tilegx.c (tilegx_elf_adjust_dynamic_symbol): Likewise. --- bfd/elf-bfd.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'bfd/elf-bfd.h') diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h index 6ce70bc..5e53cba 100644 --- a/bfd/elf-bfd.h +++ b/bfd/elf-bfd.h @@ -196,6 +196,8 @@ struct elf_link_hash_entry unsigned int pointer_equality_needed : 1; /* Symbol is a unique global symbol. */ unsigned int unique_global : 1; + /* Symbol is defined with non-default visibility. */ + unsigned int protected_def : 1; /* String table index in .dynstr if this is a dynamic symbol. */ unsigned long dynstr_index; @@ -2026,7 +2028,7 @@ extern bfd_boolean _bfd_elf_link_output_relocs struct elf_link_hash_entry **); extern bfd_boolean _bfd_elf_adjust_dynamic_copy - (struct elf_link_hash_entry *, asection *); + (struct bfd_link_info *, struct elf_link_hash_entry *, asection *); extern bfd_boolean _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); -- cgit v1.1