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e92d460e59
(_bfd_generic_link_write_global_symbol): Follow warning symbol link. * elflink.h (elf_adjust_dynstr_offsets): Likewise. (elf_adjust_dynamic_symbol): Likewise. (elf_export_symbol): Likewise. (elf_link_find_version_dependencies): Likewise. (elf_link_assign_sym_version): Likewise. (elf_link_sec_merge_syms): Likewise. (elf_link_output_extsym): Likewise. (elf_gc_sweep_symbol): Likewise. (elf_gc_propagate_vtable_entries_used): Likewise. (elf_gc_smash_unused_vtentry_relocs): Likewise. (elf_gc_allocate_got_offsets): Likewise. (elf_collect_hash_codes): Likewise. * elflink.c (elf_link_renumber_hash_table_dynsyms): Likewise. * elf-hppa.h (elf_hppa_unmark_useless_dynamic_symbols): Likewise. (elf_hppa_remark_useless_dynamic_symbols): Likewise. * elf-m10300.c (elf32_mn10300_finish_hash_table_entry): Likewise. * elf32-arm.h (elf32_arm_discard_copies): Likewise. * elf32-cris.c (elf_cris_adjust_gotplt_to_got): Likewise. (elf_cris_discard_excess_dso_dynamics): Likewise. * elf32-hppa.c (clobber_millicode_symbols): Likewise. (mark_PIC_calls): Likewise. (allocate_plt_static): Likewise. (allocate_dynrelocs): Likewise. (readonly_dynrelocs): Likewise. * elf32-i386.c (allocate_dynrelocs): Likewise. (readonly_dynrelocs): Likewise. * elf32-i370.c (i370_elf_adjust_dynindx): Likewise. * elf32-m68k.c (elf_m68k_discard_copies): Likewise. * elf32-mips.c (mips_elf_output_extsym): Likewise. (mips_elf_sort_hash_table_f): Likewise. (mips_elf_check_mips16_stubs): Likewise. * elf32-s390.c (allocate_dynrelocs): Likewise. (readonly_dynrelocs): Likewise. * elf32-sh.c (sh_elf_discard_copies): Likewise. * elf32-xstormy16.c (xstormy16_relax_plt_check): Likewise. (xstormy16_relax_plt_realloc): Likewise. * elf64-alpha.c (elf64_alpha_calc_got_offsets_for_symbol): Likewise. (elf64_alpha_output_extsym): Likewise. * elf64-hppa.c (elf64_hppa_mark_exported_functions): Likewise. * elf64-mips.c (mips_elf64_sort_hash_table_f): Likewise. (mips_elf64_check_mips16_stubs): Likewise. (mips_elf64_output_extsym): Likewise. * elf64-ppc.c (func_desc_adjust): Likewise. (allocate_dynrelocs): Likewise. (readonly_dynrelocs): Likewise. * elf64-s390.c (allocate_dynrelocs): Likewise. (readonly_dynrelocs): Likewise. * elf64-sh64.c (sh64_elf64_discard_copies): Likewise. * elf64-x86-64.c (allocate_dynrelocs): Likewise. (readonly_dynrelocs): Likewise. * elfxx-ia64.c (elfNN_ia64_global_dyn_sym_thunk): Likewise. * aoutx.h (aout_link_write_other_symbol): Likewise. * cofflink.c (_bfd_coff_write_task_globals): Likewise. (_bfd_coff_write_global_sym): Likewise. * i386linux.c (linux_tally_symbols): Likewise. * m68klinux.c (linux_tally_symbols): Likewise. * sparclinux.c (linux_tally_symbols): Likewise. * pdp11.c (aout_link_write_other_symbol): Likewise. * sunos.c (sunos_scan_dynamic_symbol): Likewise. * xcofflink.c (xcoff_build_ldsyms): Likewise. (xcoff_write_global_symbol): Likewise. * cofflink.c (_bfd_coff_final_link): Formatting. * cpu-mips.c (mips_compatible): Make static, prototype. * elf32-i386.c (elf_i386_check_relocs): Formatting. * elf32-sh.c (sh_elf_size_dynamic_sections): Likewise. * elf64-alpha.c (elf64_alpha_output_extsym): Likewise. * elf64-mips.c (mips_elf64_sort_hash_table): Likewise. (mips_elf64_final_link): Likewise. * elflink.h (elf_link_find_version_dependencies): Remove duplicate prototype.
2494 lines
79 KiB
C
2494 lines
79 KiB
C
/* IBM S/390-specific support for 32-bit ELF
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Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
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Contributed by Carl B. Pedersen and Martin Schwidefsky.
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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 2 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., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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static reloc_howto_type *elf_s390_reloc_type_lookup
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PARAMS ((bfd *, bfd_reloc_code_real_type));
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static void elf_s390_info_to_howto
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PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
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static boolean elf_s390_is_local_label_name
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PARAMS ((bfd *, const char *));
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static struct bfd_hash_entry *link_hash_newfunc
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PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
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static struct bfd_link_hash_table *elf_s390_link_hash_table_create
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PARAMS ((bfd *));
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static boolean create_got_section
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PARAMS((bfd *, struct bfd_link_info *));
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static boolean elf_s390_create_dynamic_sections
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PARAMS((bfd *, struct bfd_link_info *));
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static void elf_s390_copy_indirect_symbol
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PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *));
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static boolean elf_s390_check_relocs
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PARAMS ((bfd *, struct bfd_link_info *, asection *,
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const Elf_Internal_Rela *));
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static asection *elf_s390_gc_mark_hook
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PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
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struct elf_link_hash_entry *, Elf_Internal_Sym *));
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static boolean elf_s390_gc_sweep_hook
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PARAMS ((bfd *, struct bfd_link_info *, asection *,
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const Elf_Internal_Rela *));
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static boolean elf_s390_adjust_dynamic_symbol
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PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
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static boolean allocate_dynrelocs
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PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean readonly_dynrelocs
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PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean elf_s390_size_dynamic_sections
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean elf_s390_relocate_section
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PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
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Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
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static boolean elf_s390_finish_dynamic_symbol
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PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
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Elf_Internal_Sym *));
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static enum elf_reloc_type_class elf_s390_reloc_type_class
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PARAMS ((const Elf_Internal_Rela *));
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static boolean elf_s390_finish_dynamic_sections
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean elf_s390_object_p PARAMS ((bfd *));
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static boolean elf_s390_grok_prstatus PARAMS ((bfd *, Elf_Internal_Note *));
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#define USE_RELA 1 /* We want RELA relocations, not REL. */
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#include "elf/s390.h"
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/* The relocation "howto" table. */
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static reloc_howto_type elf_howto_table[] =
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{
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HOWTO (R_390_NONE, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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0, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_390_NONE", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
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HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
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HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
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HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
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HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
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HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
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HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
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HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
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HOWTO(R_390_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,0xffffffff, false),
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HOWTO(R_390_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,0xffffffff, false),
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HOWTO(R_390_JMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,0xffffffff, false),
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HOWTO(R_390_RELATIVE, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,0xffffffff, false),
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HOWTO(R_390_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,0xffffffff, false),
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HOWTO(R_390_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true),
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HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
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HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
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HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
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HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
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HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
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HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
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HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,0xffffffff, true),
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HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,0xffffffff, true),
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};
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/* GNU extension to record C++ vtable hierarchy. */
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static reloc_howto_type elf32_s390_vtinherit_howto =
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HOWTO (R_390_GNU_VTINHERIT, 0,2,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
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static reloc_howto_type elf32_s390_vtentry_howto =
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HOWTO (R_390_GNU_VTENTRY, 0,2,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
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static reloc_howto_type *
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elf_s390_reloc_type_lookup (abfd, code)
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bfd *abfd ATTRIBUTE_UNUSED;
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bfd_reloc_code_real_type code;
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{
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switch (code)
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{
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case BFD_RELOC_NONE:
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return &elf_howto_table[(int) R_390_NONE];
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case BFD_RELOC_8:
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return &elf_howto_table[(int) R_390_8];
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case BFD_RELOC_390_12:
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return &elf_howto_table[(int) R_390_12];
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case BFD_RELOC_16:
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return &elf_howto_table[(int) R_390_16];
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case BFD_RELOC_32:
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return &elf_howto_table[(int) R_390_32];
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case BFD_RELOC_CTOR:
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return &elf_howto_table[(int) R_390_32];
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case BFD_RELOC_32_PCREL:
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return &elf_howto_table[(int) R_390_PC32];
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case BFD_RELOC_390_GOT12:
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return &elf_howto_table[(int) R_390_GOT12];
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case BFD_RELOC_32_GOT_PCREL:
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return &elf_howto_table[(int) R_390_GOT32];
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case BFD_RELOC_390_PLT32:
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return &elf_howto_table[(int) R_390_PLT32];
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case BFD_RELOC_390_COPY:
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return &elf_howto_table[(int) R_390_COPY];
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case BFD_RELOC_390_GLOB_DAT:
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return &elf_howto_table[(int) R_390_GLOB_DAT];
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case BFD_RELOC_390_JMP_SLOT:
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return &elf_howto_table[(int) R_390_JMP_SLOT];
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case BFD_RELOC_390_RELATIVE:
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return &elf_howto_table[(int) R_390_RELATIVE];
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case BFD_RELOC_32_GOTOFF:
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return &elf_howto_table[(int) R_390_GOTOFF];
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case BFD_RELOC_390_GOTPC:
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return &elf_howto_table[(int) R_390_GOTPC];
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case BFD_RELOC_390_GOT16:
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return &elf_howto_table[(int) R_390_GOT16];
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case BFD_RELOC_16_PCREL:
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return &elf_howto_table[(int) R_390_PC16];
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case BFD_RELOC_390_PC16DBL:
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return &elf_howto_table[(int) R_390_PC16DBL];
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case BFD_RELOC_390_PLT16DBL:
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return &elf_howto_table[(int) R_390_PLT16DBL];
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case BFD_RELOC_390_PC32DBL:
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return &elf_howto_table[(int) R_390_PC32DBL];
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case BFD_RELOC_390_PLT32DBL:
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return &elf_howto_table[(int) R_390_PLT32DBL];
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case BFD_RELOC_390_GOTPCDBL:
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return &elf_howto_table[(int) R_390_GOTPCDBL];
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case BFD_RELOC_390_GOTENT:
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return &elf_howto_table[(int) R_390_GOTENT];
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case BFD_RELOC_VTABLE_INHERIT:
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return &elf32_s390_vtinherit_howto;
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case BFD_RELOC_VTABLE_ENTRY:
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return &elf32_s390_vtentry_howto;
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default:
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break;
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}
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return 0;
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}
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/* We need to use ELF32_R_TYPE so we have our own copy of this function,
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and elf32-s390.c has its own copy. */
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static void
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elf_s390_info_to_howto (abfd, cache_ptr, dst)
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bfd *abfd ATTRIBUTE_UNUSED;
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arelent *cache_ptr;
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Elf_Internal_Rela *dst;
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{
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switch (ELF32_R_TYPE(dst->r_info))
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{
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case R_390_GNU_VTINHERIT:
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cache_ptr->howto = &elf32_s390_vtinherit_howto;
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break;
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case R_390_GNU_VTENTRY:
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cache_ptr->howto = &elf32_s390_vtentry_howto;
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break;
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default:
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BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
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cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
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}
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}
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static boolean
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elf_s390_is_local_label_name (abfd, name)
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bfd *abfd;
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const char *name;
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{
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if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
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return true;
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return _bfd_elf_is_local_label_name (abfd, name);
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}
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/* Functions for the 390 ELF linker. */
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/* The name of the dynamic interpreter. This is put in the .interp
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section. */
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#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
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/* The size in bytes of the first entry in the procedure linkage table. */
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#define PLT_FIRST_ENTRY_SIZE 32
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/* The size in bytes of an entry in the procedure linkage table. */
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#define PLT_ENTRY_SIZE 32
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#define GOT_ENTRY_SIZE 4
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/* The first three entries in a procedure linkage table are reserved,
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and the initial contents are unimportant (we zero them out).
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Subsequent entries look like this. See the SVR4 ABI 386
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supplement to see how this works. */
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/* For the s390, simple addr offset can only be 0 - 4096.
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To use the full 2 GB address space, several instructions
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are needed to load an address in a register and execute
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a branch( or just saving the address)
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Furthermore, only r 0 and 1 are free to use!!! */
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/* The first 3 words in the GOT are then reserved.
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Word 0 is the address of the dynamic table.
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Word 1 is a pointer to a structure describing the object
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Word 2 is used to point to the loader entry address.
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The code for position independand PLT entries looks like this:
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r12 holds addr of the current GOT at entry to the PLT
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The GOT holds the address in the PLT to be executed.
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The loader then gets:
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24(15) = Pointer to the structure describing the object.
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28(15) = Offset in symbol table
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The loader must then find the module where the function is
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and insert the address in the GOT.
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Note: 390 can only address +- 64 K relative.
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We check if offset > 65536, then make a relative branch -64xxx
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back to a previous defined branch
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PLT1: BASR 1,0 # 2 bytes
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L 1,22(1) # 4 bytes Load offset in GOT in r 1
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L 1,(1,12) # 4 bytes Load address from GOT in r1
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BCR 15,1 # 2 bytes Jump to address
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RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
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L 1,14(1) # 4 bytes Load offset in symol table in r1
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BRC 15,-x # 4 bytes Jump to start of PLT
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.word 0 # 2 bytes filler
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.long ? # 4 bytes offset in GOT
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.long ? # 4 bytes offset into symbol table
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This was the general case. There are two additional, optimizes PLT
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definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
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First the one for GOT offsets < 4096:
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PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
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BCR 15,1 # 2 bytes Jump to address
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.word 0,0,0 # 6 bytes filler
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RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
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L 1,14(1) # 4 bytes Load offset in symbol table in r1
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BRC 15,-x # 4 bytes Jump to start of PLT
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.word 0,0,0 # 6 bytes filler
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.long ? # 4 bytes offset into symbol table
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Second the one for GOT offsets < 32768:
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PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
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L 1,(1,12) # 4 bytes Load address from GOT to r1
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BCR 15,1 # 2 bytes Jump to address
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.word 0 # 2 bytes filler
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RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
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L 1,14(1) # 4 bytes Load offset in symbol table in r1
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BRC 15,-x # 4 bytes Jump to start of PLT
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.word 0,0,0 # 6 bytes filler
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.long ? # 4 bytes offset into symbol table
|
|
|
|
Total = 32 bytes per PLT entry
|
|
|
|
The code for static build PLT entries looks like this:
|
|
|
|
PLT1: BASR 1,0 # 2 bytes
|
|
L 1,22(1) # 4 bytes Load address of GOT entry
|
|
L 1,0(0,1) # 4 bytes Load address from GOT in r1
|
|
BCR 15,1 # 2 bytes Jump to address
|
|
RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
|
|
L 1,14(1) # 4 bytes Load offset in symbol table in r1
|
|
BRC 15,-x # 4 bytes Jump to start of PLT
|
|
.word 0 # 2 bytes filler
|
|
.long ? # 4 bytes address of GOT entry
|
|
.long ? # 4 bytes offset into symbol table */
|
|
|
|
#define PLT_PIC_ENTRY_WORD0 0x0d105810
|
|
#define PLT_PIC_ENTRY_WORD1 0x10165811
|
|
#define PLT_PIC_ENTRY_WORD2 0xc00007f1
|
|
#define PLT_PIC_ENTRY_WORD3 0x0d105810
|
|
#define PLT_PIC_ENTRY_WORD4 0x100ea7f4
|
|
|
|
#define PLT_PIC12_ENTRY_WORD0 0x5810c000
|
|
#define PLT_PIC12_ENTRY_WORD1 0x07f10000
|
|
#define PLT_PIC12_ENTRY_WORD2 0x00000000
|
|
#define PLT_PIC12_ENTRY_WORD3 0x0d105810
|
|
#define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
|
|
|
|
#define PLT_PIC16_ENTRY_WORD0 0xa7180000
|
|
#define PLT_PIC16_ENTRY_WORD1 0x5811c000
|
|
#define PLT_PIC16_ENTRY_WORD2 0x07f10000
|
|
#define PLT_PIC16_ENTRY_WORD3 0x0d105810
|
|
#define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
|
|
|
|
#define PLT_ENTRY_WORD0 0x0d105810
|
|
#define PLT_ENTRY_WORD1 0x10165810
|
|
#define PLT_ENTRY_WORD2 0x100007f1
|
|
#define PLT_ENTRY_WORD3 0x0d105810
|
|
#define PLT_ENTRY_WORD4 0x100ea7f4
|
|
|
|
/* The first PLT entry pushes the offset into the symbol table
|
|
from R1 onto the stack at 8(15) and the loader object info
|
|
at 12(15), loads the loader address in R1 and jumps to it. */
|
|
|
|
/* The first entry in the PLT for PIC code:
|
|
|
|
PLT0:
|
|
ST 1,28(15) # R1 has offset into symbol table
|
|
L 1,4(12) # Get loader ino(object struct address)
|
|
ST 1,24(15) # Store address
|
|
L 1,8(12) # Entry address of loader in R1
|
|
BR 1 # Jump to loader
|
|
|
|
The first entry in the PLT for static code:
|
|
|
|
PLT0:
|
|
ST 1,28(15) # R1 has offset into symbol table
|
|
BASR 1,0
|
|
L 1,18(0,1) # Get address of GOT
|
|
MVC 24(4,15),4(1) # Move loader ino to stack
|
|
L 1,8(1) # Get address of loader
|
|
BR 1 # Jump to loader
|
|
.word 0 # filler
|
|
.long got # address of GOT */
|
|
|
|
#define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
|
|
#define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
|
|
#define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
|
|
#define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
|
|
#define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
|
|
|
|
#define PLT_FIRST_ENTRY_WORD0 0x5010f01c
|
|
#define PLT_FIRST_ENTRY_WORD1 0x0d105810
|
|
#define PLT_FIRST_ENTRY_WORD2 0x1012D203
|
|
#define PLT_FIRST_ENTRY_WORD3 0xf0181004
|
|
#define PLT_FIRST_ENTRY_WORD4 0x58101008
|
|
#define PLT_FIRST_ENTRY_WORD5 0x07f10000
|
|
|
|
/* The s390 linker needs to keep track of the number of relocs that it
|
|
decides to copy as dynamic relocs in check_relocs for each symbol.
|
|
This is so that it can later discard them if they are found to be
|
|
unnecessary. We store the information in a field extending the
|
|
regular ELF linker hash table. */
|
|
|
|
struct elf_s390_dyn_relocs
|
|
{
|
|
struct elf_s390_dyn_relocs *next;
|
|
|
|
/* The input section of the reloc. */
|
|
asection *sec;
|
|
|
|
/* Total number of relocs copied for the input section. */
|
|
bfd_size_type count;
|
|
|
|
/* Number of pc-relative relocs copied for the input section. */
|
|
bfd_size_type pc_count;
|
|
};
|
|
|
|
/* s390 ELF linker hash entry. */
|
|
|
|
struct elf_s390_link_hash_entry
|
|
{
|
|
struct elf_link_hash_entry elf;
|
|
|
|
/* Track dynamic relocs copied for this symbol. */
|
|
struct elf_s390_dyn_relocs *dyn_relocs;
|
|
};
|
|
|
|
/* s390 ELF linker hash table. */
|
|
|
|
struct elf_s390_link_hash_table
|
|
{
|
|
struct elf_link_hash_table elf;
|
|
|
|
/* Short-cuts to get to dynamic linker sections. */
|
|
asection *sgot;
|
|
asection *sgotplt;
|
|
asection *srelgot;
|
|
asection *splt;
|
|
asection *srelplt;
|
|
asection *sdynbss;
|
|
asection *srelbss;
|
|
|
|
/* Small local sym to section mapping cache. */
|
|
struct sym_sec_cache sym_sec;
|
|
};
|
|
|
|
/* Get the s390 ELF linker hash table from a link_info structure. */
|
|
|
|
#define elf_s390_hash_table(p) \
|
|
((struct elf_s390_link_hash_table *) ((p)->hash))
|
|
|
|
/* Create an entry in an s390 ELF linker hash table. */
|
|
|
|
static struct bfd_hash_entry *
|
|
link_hash_newfunc (entry, table, string)
|
|
struct bfd_hash_entry *entry;
|
|
struct bfd_hash_table *table;
|
|
const char *string;
|
|
{
|
|
/* Allocate the structure if it has not already been allocated by a
|
|
subclass. */
|
|
if (entry == NULL)
|
|
{
|
|
entry = bfd_hash_allocate (table,
|
|
sizeof (struct elf_s390_link_hash_entry));
|
|
if (entry == NULL)
|
|
return entry;
|
|
}
|
|
|
|
/* Call the allocation method of the superclass. */
|
|
entry = _bfd_elf_link_hash_newfunc (entry, table, string);
|
|
if (entry != NULL)
|
|
{
|
|
struct elf_s390_link_hash_entry *eh;
|
|
|
|
eh = (struct elf_s390_link_hash_entry *) entry;
|
|
eh->dyn_relocs = NULL;
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
/* Create an s390 ELF linker hash table. */
|
|
|
|
static struct bfd_link_hash_table *
|
|
elf_s390_link_hash_table_create (abfd)
|
|
bfd *abfd;
|
|
{
|
|
struct elf_s390_link_hash_table *ret;
|
|
bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
|
|
|
|
ret = (struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt);
|
|
if (ret == NULL)
|
|
return NULL;
|
|
|
|
if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
|
|
{
|
|
bfd_release (abfd, ret);
|
|
return NULL;
|
|
}
|
|
|
|
ret->sgot = NULL;
|
|
ret->sgotplt = NULL;
|
|
ret->srelgot = NULL;
|
|
ret->splt = NULL;
|
|
ret->srelplt = NULL;
|
|
ret->sdynbss = NULL;
|
|
ret->srelbss = NULL;
|
|
ret->sym_sec.abfd = NULL;
|
|
|
|
return &ret->elf.root;
|
|
}
|
|
|
|
/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
|
|
shortcuts to them in our hash table. */
|
|
|
|
static boolean
|
|
create_got_section (dynobj, info)
|
|
bfd *dynobj;
|
|
struct bfd_link_info *info;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
|
|
if (! _bfd_elf_create_got_section (dynobj, info))
|
|
return false;
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
htab->sgot = bfd_get_section_by_name (dynobj, ".got");
|
|
htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
|
|
if (!htab->sgot || !htab->sgotplt)
|
|
abort ();
|
|
|
|
htab->srelgot = bfd_make_section (dynobj, ".rela.got");
|
|
if (htab->srelgot == NULL
|
|
|| ! bfd_set_section_flags (dynobj, htab->srelgot,
|
|
(SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
|
|
| SEC_IN_MEMORY | SEC_LINKER_CREATED
|
|
| SEC_READONLY))
|
|
|| ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
|
|
.rela.bss sections in DYNOBJ, and set up shortcuts to them in our
|
|
hash table. */
|
|
|
|
static boolean
|
|
elf_s390_create_dynamic_sections (dynobj, info)
|
|
bfd *dynobj;
|
|
struct bfd_link_info *info;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
if (!htab->sgot && !create_got_section (dynobj, info))
|
|
return false;
|
|
|
|
if (!_bfd_elf_create_dynamic_sections (dynobj, info))
|
|
return false;
|
|
|
|
htab->splt = bfd_get_section_by_name (dynobj, ".plt");
|
|
htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
|
|
htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
|
|
if (!info->shared)
|
|
htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
|
|
|
|
if (!htab->splt || !htab->srelplt || !htab->sdynbss
|
|
|| (!info->shared && !htab->srelbss))
|
|
abort ();
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Copy the extra info we tack onto an elf_link_hash_entry. */
|
|
|
|
static void
|
|
elf_s390_copy_indirect_symbol (dir, ind)
|
|
struct elf_link_hash_entry *dir, *ind;
|
|
{
|
|
struct elf_s390_link_hash_entry *edir, *eind;
|
|
|
|
edir = (struct elf_s390_link_hash_entry *) dir;
|
|
eind = (struct elf_s390_link_hash_entry *) ind;
|
|
|
|
if (eind->dyn_relocs != NULL)
|
|
{
|
|
if (edir->dyn_relocs != NULL)
|
|
{
|
|
struct elf_s390_dyn_relocs **pp;
|
|
struct elf_s390_dyn_relocs *p;
|
|
|
|
if (ind->root.type == bfd_link_hash_indirect)
|
|
abort ();
|
|
|
|
/* Add reloc counts against the weak sym to the strong sym
|
|
list. Merge any entries against the same section. */
|
|
for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
|
|
{
|
|
struct elf_s390_dyn_relocs *q;
|
|
|
|
for (q = edir->dyn_relocs; q != NULL; q = q->next)
|
|
if (q->sec == p->sec)
|
|
{
|
|
q->pc_count += p->pc_count;
|
|
q->count += p->count;
|
|
*pp = p->next;
|
|
break;
|
|
}
|
|
if (q == NULL)
|
|
pp = &p->next;
|
|
}
|
|
*pp = edir->dyn_relocs;
|
|
}
|
|
|
|
edir->dyn_relocs = eind->dyn_relocs;
|
|
eind->dyn_relocs = NULL;
|
|
}
|
|
|
|
_bfd_elf_link_hash_copy_indirect (dir, ind);
|
|
}
|
|
|
|
/* Look through the relocs for a section during the first phase, and
|
|
allocate space in the global offset table or procedure linkage
|
|
table. */
|
|
|
|
static boolean
|
|
elf_s390_check_relocs (abfd, info, sec, relocs)
|
|
bfd *abfd;
|
|
struct bfd_link_info *info;
|
|
asection *sec;
|
|
const Elf_Internal_Rela *relocs;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
Elf_Internal_Shdr *symtab_hdr;
|
|
struct elf_link_hash_entry **sym_hashes;
|
|
const Elf_Internal_Rela *rel;
|
|
const Elf_Internal_Rela *rel_end;
|
|
asection *sreloc;
|
|
|
|
if (info->relocateable)
|
|
return true;
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
|
sym_hashes = elf_sym_hashes (abfd);
|
|
|
|
sreloc = NULL;
|
|
|
|
rel_end = relocs + sec->reloc_count;
|
|
for (rel = relocs; rel < rel_end; rel++)
|
|
{
|
|
unsigned long r_symndx;
|
|
struct elf_link_hash_entry *h;
|
|
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
|
|
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
|
|
{
|
|
(*_bfd_error_handler) (_("%s: bad symbol index: %d"),
|
|
bfd_archive_filename (abfd),
|
|
r_symndx);
|
|
return false;
|
|
}
|
|
|
|
if (r_symndx < symtab_hdr->sh_info)
|
|
h = NULL;
|
|
else
|
|
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
|
|
|
switch (ELF32_R_TYPE (rel->r_info))
|
|
{
|
|
case R_390_GOT12:
|
|
case R_390_GOT16:
|
|
case R_390_GOT32:
|
|
case R_390_GOTENT:
|
|
/* This symbol requires a global offset table entry. */
|
|
if (h != NULL)
|
|
{
|
|
h->got.refcount += 1;
|
|
}
|
|
else
|
|
{
|
|
bfd_signed_vma *local_got_refcounts;
|
|
|
|
/* This is a global offset table entry for a local symbol. */
|
|
local_got_refcounts = elf_local_got_refcounts (abfd);
|
|
if (local_got_refcounts == NULL)
|
|
{
|
|
bfd_size_type size;
|
|
|
|
size = symtab_hdr->sh_info;
|
|
size *= sizeof (bfd_signed_vma);
|
|
local_got_refcounts = ((bfd_signed_vma *)
|
|
bfd_zalloc (abfd, size));
|
|
if (local_got_refcounts == NULL)
|
|
return false;
|
|
elf_local_got_refcounts (abfd) = local_got_refcounts;
|
|
}
|
|
local_got_refcounts[r_symndx] += 1;
|
|
}
|
|
/* Fall through */
|
|
|
|
case R_390_GOTOFF:
|
|
case R_390_GOTPC:
|
|
case R_390_GOTPCDBL:
|
|
if (htab->sgot == NULL)
|
|
{
|
|
if (htab->elf.dynobj == NULL)
|
|
htab->elf.dynobj = abfd;
|
|
if (!create_got_section (htab->elf.dynobj, info))
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case R_390_PLT16DBL:
|
|
case R_390_PLT32DBL:
|
|
case R_390_PLT32:
|
|
/* This symbol requires a procedure linkage table entry. We
|
|
actually build the entry in adjust_dynamic_symbol,
|
|
because this might be a case of linking PIC code which is
|
|
never referenced by a dynamic object, in which case we
|
|
don't need to generate a procedure linkage table entry
|
|
after all. */
|
|
|
|
/* If this is a local symbol, we resolve it directly without
|
|
creating a procedure linkage table entry. */
|
|
if (h == NULL)
|
|
continue;
|
|
|
|
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
|
|
h->plt.refcount += 1;
|
|
break;
|
|
|
|
case R_390_8:
|
|
case R_390_16:
|
|
case R_390_32:
|
|
case R_390_PC16:
|
|
case R_390_PC16DBL:
|
|
case R_390_PC32DBL:
|
|
case R_390_PC32:
|
|
if (h != NULL && !info->shared)
|
|
{
|
|
/* If this reloc is in a read-only section, we might
|
|
need a copy reloc. We can't check reliably at this
|
|
stage whether the section is read-only, as input
|
|
sections have not yet been mapped to output sections.
|
|
Tentatively set the flag for now, and correct in
|
|
adjust_dynamic_symbol. */
|
|
h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
|
|
|
|
/* We may need a .plt entry if the function this reloc
|
|
refers to is in a shared lib. */
|
|
h->plt.refcount += 1;
|
|
}
|
|
|
|
/* If we are creating a shared library, and this is a reloc
|
|
against a global symbol, or a non PC relative reloc
|
|
against a local symbol, then we need to copy the reloc
|
|
into the shared library. However, if we are linking with
|
|
-Bsymbolic, we do not need to copy a reloc against a
|
|
global symbol which is defined in an object we are
|
|
including in the link (i.e., DEF_REGULAR is set). At
|
|
this point we have not seen all the input files, so it is
|
|
possible that DEF_REGULAR is not set now but will be set
|
|
later (it is never cleared). In case of a weak definition,
|
|
DEF_REGULAR may be cleared later by a strong definition in
|
|
a shared library. We account for that possibility below by
|
|
storing information in the relocs_copied field of the hash
|
|
table entry. A similar situation occurs when creating
|
|
shared libraries and symbol visibility changes render the
|
|
symbol local.
|
|
|
|
If on the other hand, we are creating an executable, we
|
|
may need to keep relocations for symbols satisfied by a
|
|
dynamic library if we manage to avoid copy relocs for the
|
|
symbol. */
|
|
if ((info->shared
|
|
&& (sec->flags & SEC_ALLOC) != 0
|
|
&& ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
|
|
&& ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
|
|
&& ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
|
|
&& ELF32_R_TYPE (rel->r_info) != R_390_PC32)
|
|
|| (h != NULL
|
|
&& (! info->symbolic
|
|
|| h->root.type == bfd_link_hash_defweak
|
|
|| (h->elf_link_hash_flags
|
|
& ELF_LINK_HASH_DEF_REGULAR) == 0))))
|
|
|| (!info->shared
|
|
&& (sec->flags & SEC_ALLOC) != 0
|
|
&& h != NULL
|
|
&& (h->root.type == bfd_link_hash_defweak
|
|
|| (h->elf_link_hash_flags
|
|
& ELF_LINK_HASH_DEF_REGULAR) == 0)))
|
|
{
|
|
struct elf_s390_dyn_relocs *p;
|
|
struct elf_s390_dyn_relocs **head;
|
|
|
|
/* We must copy these reloc types into the output file.
|
|
Create a reloc section in dynobj and make room for
|
|
this reloc. */
|
|
if (sreloc == NULL)
|
|
{
|
|
const char *name;
|
|
bfd *dynobj;
|
|
|
|
name = (bfd_elf_string_from_elf_section
|
|
(abfd,
|
|
elf_elfheader (abfd)->e_shstrndx,
|
|
elf_section_data (sec)->rel_hdr.sh_name));
|
|
if (name == NULL)
|
|
return false;
|
|
|
|
if (strncmp (name, ".rela", 5) != 0
|
|
|| strcmp (bfd_get_section_name (abfd, sec),
|
|
name + 5) != 0)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: bad relocation section name `%s\'"),
|
|
bfd_archive_filename (abfd), name);
|
|
}
|
|
|
|
if (htab->elf.dynobj == NULL)
|
|
htab->elf.dynobj = abfd;
|
|
|
|
dynobj = htab->elf.dynobj;
|
|
sreloc = bfd_get_section_by_name (dynobj, name);
|
|
if (sreloc == NULL)
|
|
{
|
|
flagword flags;
|
|
|
|
sreloc = bfd_make_section (dynobj, name);
|
|
flags = (SEC_HAS_CONTENTS | SEC_READONLY
|
|
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
|
|
if ((sec->flags & SEC_ALLOC) != 0)
|
|
flags |= SEC_ALLOC | SEC_LOAD;
|
|
if (sreloc == NULL
|
|
|| ! bfd_set_section_flags (dynobj, sreloc, flags)
|
|
|| ! bfd_set_section_alignment (dynobj, sreloc, 2))
|
|
return false;
|
|
}
|
|
elf_section_data (sec)->sreloc = sreloc;
|
|
}
|
|
|
|
/* If this is a global symbol, we count the number of
|
|
relocations we need for this symbol. */
|
|
if (h != NULL)
|
|
{
|
|
head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
|
|
}
|
|
else
|
|
{
|
|
/* Track dynamic relocs needed for local syms too.
|
|
We really need local syms available to do this
|
|
easily. Oh well. */
|
|
|
|
asection *s;
|
|
s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
|
|
sec, r_symndx);
|
|
if (s == NULL)
|
|
return false;
|
|
|
|
head = ((struct elf_s390_dyn_relocs **)
|
|
&elf_section_data (s)->local_dynrel);
|
|
}
|
|
|
|
p = *head;
|
|
if (p == NULL || p->sec != sec)
|
|
{
|
|
bfd_size_type amt = sizeof *p;
|
|
p = ((struct elf_s390_dyn_relocs *)
|
|
bfd_alloc (htab->elf.dynobj, amt));
|
|
if (p == NULL)
|
|
return false;
|
|
p->next = *head;
|
|
*head = p;
|
|
p->sec = sec;
|
|
p->count = 0;
|
|
p->pc_count = 0;
|
|
}
|
|
|
|
p->count += 1;
|
|
if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
|
|
|| ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
|
|
|| ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
|
|
|| ELF32_R_TYPE (rel->r_info) == R_390_PC32)
|
|
p->pc_count += 1;
|
|
}
|
|
break;
|
|
|
|
/* This relocation describes the C++ object vtable hierarchy.
|
|
Reconstruct it for later use during GC. */
|
|
case R_390_GNU_VTINHERIT:
|
|
if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
|
|
return false;
|
|
break;
|
|
|
|
/* This relocation describes which C++ vtable entries are actually
|
|
used. Record for later use during GC. */
|
|
case R_390_GNU_VTENTRY:
|
|
if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
|
|
return false;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Return the section that should be marked against GC for a given
|
|
relocation. */
|
|
|
|
static asection *
|
|
elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
|
|
bfd *abfd;
|
|
struct bfd_link_info *info ATTRIBUTE_UNUSED;
|
|
Elf_Internal_Rela *rel;
|
|
struct elf_link_hash_entry *h;
|
|
Elf_Internal_Sym *sym;
|
|
{
|
|
if (h != NULL)
|
|
{
|
|
switch (ELF32_R_TYPE (rel->r_info))
|
|
{
|
|
case R_390_GNU_VTINHERIT:
|
|
case R_390_GNU_VTENTRY:
|
|
break;
|
|
|
|
default:
|
|
switch (h->root.type)
|
|
{
|
|
case bfd_link_hash_defined:
|
|
case bfd_link_hash_defweak:
|
|
return h->root.u.def.section;
|
|
|
|
case bfd_link_hash_common:
|
|
return h->root.u.c.p->section;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return bfd_section_from_elf_index (abfd, sym->st_shndx);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Update the got entry reference counts for the section being removed. */
|
|
|
|
static boolean
|
|
elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
|
|
bfd *abfd;
|
|
struct bfd_link_info *info;
|
|
asection *sec;
|
|
const Elf_Internal_Rela *relocs;
|
|
{
|
|
Elf_Internal_Shdr *symtab_hdr;
|
|
struct elf_link_hash_entry **sym_hashes;
|
|
bfd_signed_vma *local_got_refcounts;
|
|
const Elf_Internal_Rela *rel, *relend;
|
|
unsigned long r_symndx;
|
|
struct elf_link_hash_entry *h;
|
|
|
|
elf_section_data (sec)->local_dynrel = NULL;
|
|
|
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
|
sym_hashes = elf_sym_hashes (abfd);
|
|
local_got_refcounts = elf_local_got_refcounts (abfd);
|
|
|
|
relend = relocs + sec->reloc_count;
|
|
for (rel = relocs; rel < relend; rel++)
|
|
switch (ELF32_R_TYPE (rel->r_info))
|
|
{
|
|
case R_390_GOT12:
|
|
case R_390_GOT16:
|
|
case R_390_GOT32:
|
|
case R_390_GOTOFF:
|
|
case R_390_GOTPC:
|
|
case R_390_GOTPCDBL:
|
|
case R_390_GOTENT:
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
if (r_symndx >= symtab_hdr->sh_info)
|
|
{
|
|
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
|
if (h->got.refcount > 0)
|
|
h->got.refcount -= 1;
|
|
}
|
|
else if (local_got_refcounts != NULL)
|
|
{
|
|
if (local_got_refcounts[r_symndx] > 0)
|
|
local_got_refcounts[r_symndx] -= 1;
|
|
}
|
|
break;
|
|
|
|
case R_390_8:
|
|
case R_390_12:
|
|
case R_390_16:
|
|
case R_390_32:
|
|
case R_390_PC16:
|
|
case R_390_PC16DBL:
|
|
case R_390_PC32DBL:
|
|
case R_390_PC32:
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
if (r_symndx >= symtab_hdr->sh_info)
|
|
{
|
|
struct elf_s390_link_hash_entry *eh;
|
|
struct elf_s390_dyn_relocs **pp;
|
|
struct elf_s390_dyn_relocs *p;
|
|
|
|
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
|
|
|
if (!info->shared && h->plt.refcount > 0)
|
|
h->plt.refcount -= 1;
|
|
|
|
eh = (struct elf_s390_link_hash_entry *) h;
|
|
|
|
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
|
|
if (p->sec == sec)
|
|
{
|
|
if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
|
|
|| ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
|
|
|| ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
|
|
|| ELF32_R_TYPE (rel->r_info) == R_390_PC32)
|
|
p->pc_count -= 1;
|
|
p->count -= 1;
|
|
if (p->count == 0)
|
|
*pp = p->next;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case R_390_PLT16DBL:
|
|
case R_390_PLT32DBL:
|
|
case R_390_PLT32:
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
if (r_symndx >= symtab_hdr->sh_info)
|
|
{
|
|
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
|
if (h->plt.refcount > 0)
|
|
h->plt.refcount -= 1;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Adjust a symbol defined by a dynamic object and referenced by a
|
|
regular object. The current definition is in some section of the
|
|
dynamic object, but we're not including those sections. We have to
|
|
change the definition to something the rest of the link can
|
|
understand. */
|
|
|
|
static boolean
|
|
elf_s390_adjust_dynamic_symbol (info, h)
|
|
struct bfd_link_info *info;
|
|
struct elf_link_hash_entry *h;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
struct elf_s390_link_hash_entry * eh;
|
|
struct elf_s390_dyn_relocs *p;
|
|
asection *s;
|
|
unsigned int power_of_two;
|
|
|
|
/* If this is a function, put it in the procedure linkage table. We
|
|
will fill in the contents of the procedure linkage table later
|
|
(although we could actually do it here). */
|
|
if (h->type == STT_FUNC
|
|
|| (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
|
|
{
|
|
if (h->plt.refcount <= 0
|
|
|| (! info->shared
|
|
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
|
|
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
|
|
&& h->root.type != bfd_link_hash_undefweak
|
|
&& h->root.type != bfd_link_hash_undefined))
|
|
{
|
|
/* This case can occur if we saw a PLT32 reloc in an input
|
|
file, but the symbol was never referred to by a dynamic
|
|
object, or if all references were garbage collected. In
|
|
such a case, we don't actually need to build a procedure
|
|
linkage table, and we can just do a PC32 reloc instead. */
|
|
h->plt.offset = (bfd_vma) -1;
|
|
h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
else
|
|
/* It's possible that we incorrectly decided a .plt reloc was
|
|
needed for an R_390_PC32 reloc to a non-function sym in
|
|
check_relocs. We can't decide accurately between function and
|
|
non-function syms in check-relocs; Objects loaded later in
|
|
the link may change h->type. So fix it now. */
|
|
h->plt.offset = (bfd_vma) -1;
|
|
|
|
/* If this is a weak symbol, and there is a real definition, the
|
|
processor independent code will have arranged for us to see the
|
|
real definition first, and we can just use the same value. */
|
|
if (h->weakdef != NULL)
|
|
{
|
|
BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
|
|
|| h->weakdef->root.type == bfd_link_hash_defweak);
|
|
h->root.u.def.section = h->weakdef->root.u.def.section;
|
|
h->root.u.def.value = h->weakdef->root.u.def.value;
|
|
return true;
|
|
}
|
|
|
|
/* This is a reference to a symbol defined by a dynamic object which
|
|
is not a function. */
|
|
|
|
/* If we are creating a shared library, we must presume that the
|
|
only references to the symbol are via the global offset table.
|
|
For such cases we need not do anything here; the relocations will
|
|
be handled correctly by relocate_section. */
|
|
if (info->shared)
|
|
return true;
|
|
|
|
/* If there are no references to this symbol that do not use the
|
|
GOT, we don't need to generate a copy reloc. */
|
|
if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
|
|
return true;
|
|
|
|
/* If -z nocopyreloc was given, we won't generate them either. */
|
|
if (info->nocopyreloc)
|
|
{
|
|
h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
|
|
return true;
|
|
}
|
|
|
|
eh = (struct elf_s390_link_hash_entry *) h;
|
|
for (p = eh->dyn_relocs; p != NULL; p = p->next)
|
|
{
|
|
s = p->sec->output_section;
|
|
if (s != NULL && (s->flags & SEC_READONLY) != 0)
|
|
break;
|
|
}
|
|
|
|
/* If we didn't find any dynamic relocs in read-only sections, then
|
|
we'll be keeping the dynamic relocs and avoiding the copy reloc. */
|
|
if (p == NULL)
|
|
{
|
|
h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
|
|
return true;
|
|
}
|
|
|
|
/* We must allocate the symbol in our .dynbss section, which will
|
|
become part of the .bss section of the executable. There will be
|
|
an entry for this symbol in the .dynsym section. The dynamic
|
|
object will contain position independent code, so all references
|
|
from the dynamic object to this symbol will go through the global
|
|
offset table. The dynamic linker will use the .dynsym entry to
|
|
determine the address it must put in the global offset table, so
|
|
both the dynamic object and the regular object will refer to the
|
|
same memory location for the variable. */
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
|
|
/* We must generate a R_390_COPY reloc to tell the dynamic linker to
|
|
copy the initial value out of the dynamic object and into the
|
|
runtime process image. */
|
|
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
|
|
{
|
|
htab->srelbss->_raw_size += sizeof (Elf32_External_Rela);
|
|
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
|
|
}
|
|
|
|
/* We need to figure out the alignment required for this symbol. I
|
|
have no idea how ELF linkers handle this. */
|
|
power_of_two = bfd_log2 (h->size);
|
|
if (power_of_two > 3)
|
|
power_of_two = 3;
|
|
|
|
/* Apply the required alignment. */
|
|
s = htab->sdynbss;
|
|
s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
|
|
if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
|
|
{
|
|
if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
|
|
return false;
|
|
}
|
|
|
|
/* Define the symbol as being at this point in the section. */
|
|
h->root.u.def.section = s;
|
|
h->root.u.def.value = s->_raw_size;
|
|
|
|
/* Increment the section size to make room for the symbol. */
|
|
s->_raw_size += h->size;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* This is the condition under which elf_s390_finish_dynamic_symbol
|
|
will be called from elflink.h. If elflink.h doesn't call our
|
|
finish_dynamic_symbol routine, we'll need to do something about
|
|
initializing any .plt and .got entries in elf_s390_relocate_section. */
|
|
#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
|
|
((DYN) \
|
|
&& ((INFO)->shared \
|
|
|| ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
|
|
&& ((H)->dynindx != -1 \
|
|
|| ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
|
|
|
|
/* Allocate space in .plt, .got and associated reloc sections for
|
|
dynamic relocs. */
|
|
|
|
static boolean
|
|
allocate_dynrelocs (h, inf)
|
|
struct elf_link_hash_entry *h;
|
|
PTR inf;
|
|
{
|
|
struct bfd_link_info *info;
|
|
struct elf_s390_link_hash_table *htab;
|
|
struct elf_s390_link_hash_entry *eh;
|
|
struct elf_s390_dyn_relocs *p;
|
|
|
|
if (h->root.type == bfd_link_hash_indirect)
|
|
return true;
|
|
|
|
if (h->root.type == bfd_link_hash_warning)
|
|
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
|
|
|
info = (struct bfd_link_info *) inf;
|
|
htab = elf_s390_hash_table (info);
|
|
|
|
if (htab->elf.dynamic_sections_created
|
|
&& h->plt.refcount > 0)
|
|
{
|
|
/* Make sure this symbol is output as a dynamic symbol.
|
|
Undefined weak syms won't yet be marked as dynamic. */
|
|
if (h->dynindx == -1
|
|
&& (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
|
|
{
|
|
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
|
|
return false;
|
|
}
|
|
|
|
if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
|
|
{
|
|
asection *s = htab->splt;
|
|
|
|
/* If this is the first .plt entry, make room for the special
|
|
first entry. */
|
|
if (s->_raw_size == 0)
|
|
s->_raw_size += PLT_FIRST_ENTRY_SIZE;
|
|
|
|
h->plt.offset = s->_raw_size;
|
|
|
|
/* If this symbol is not defined in a regular file, and we are
|
|
not generating a shared library, then set the symbol to this
|
|
location in the .plt. This is required to make function
|
|
pointers compare as equal between the normal executable and
|
|
the shared library. */
|
|
if (! info->shared
|
|
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
|
{
|
|
h->root.u.def.section = s;
|
|
h->root.u.def.value = h->plt.offset;
|
|
}
|
|
|
|
/* Make room for this entry. */
|
|
s->_raw_size += PLT_ENTRY_SIZE;
|
|
|
|
/* We also need to make an entry in the .got.plt section, which
|
|
will be placed in the .got section by the linker script. */
|
|
htab->sgotplt->_raw_size += GOT_ENTRY_SIZE;
|
|
|
|
/* We also need to make an entry in the .rela.plt section. */
|
|
htab->srelplt->_raw_size += sizeof (Elf32_External_Rela);
|
|
}
|
|
else
|
|
{
|
|
h->plt.offset = (bfd_vma) -1;
|
|
h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
h->plt.offset = (bfd_vma) -1;
|
|
h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
|
|
}
|
|
|
|
if (h->got.refcount > 0)
|
|
{
|
|
asection *s;
|
|
boolean dyn;
|
|
|
|
/* Make sure this symbol is output as a dynamic symbol.
|
|
Undefined weak syms won't yet be marked as dynamic. */
|
|
if (h->dynindx == -1
|
|
&& (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
|
|
{
|
|
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
|
|
return false;
|
|
}
|
|
|
|
s = htab->sgot;
|
|
h->got.offset = s->_raw_size;
|
|
s->_raw_size += GOT_ENTRY_SIZE;
|
|
dyn = htab->elf.dynamic_sections_created;
|
|
if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
|
|
htab->srelgot->_raw_size += sizeof (Elf32_External_Rela);
|
|
}
|
|
else
|
|
h->got.offset = (bfd_vma) -1;
|
|
|
|
eh = (struct elf_s390_link_hash_entry *) h;
|
|
if (eh->dyn_relocs == NULL)
|
|
return true;
|
|
|
|
/* In the shared -Bsymbolic case, discard space allocated for
|
|
dynamic pc-relative relocs against symbols which turn out to be
|
|
defined in regular objects. For the normal shared case, discard
|
|
space for pc-relative relocs that have become local due to symbol
|
|
visibility changes. */
|
|
|
|
if (info->shared)
|
|
{
|
|
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
|
|
&& ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
|
|
|| info->symbolic))
|
|
{
|
|
struct elf_s390_dyn_relocs **pp;
|
|
|
|
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
|
|
{
|
|
p->count -= p->pc_count;
|
|
p->pc_count = 0;
|
|
if (p->count == 0)
|
|
*pp = p->next;
|
|
else
|
|
pp = &p->next;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* For the non-shared case, discard space for relocs against
|
|
symbols which turn out to need copy relocs or are not
|
|
dynamic. */
|
|
|
|
if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
|
|
&& (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
|
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
|
|| (htab->elf.dynamic_sections_created
|
|
&& (h->root.type == bfd_link_hash_undefweak
|
|
|| h->root.type == bfd_link_hash_undefined))))
|
|
{
|
|
/* Make sure this symbol is output as a dynamic symbol.
|
|
Undefined weak syms won't yet be marked as dynamic. */
|
|
if (h->dynindx == -1
|
|
&& (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
|
|
{
|
|
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
|
|
return false;
|
|
}
|
|
|
|
/* If that succeeded, we know we'll be keeping all the
|
|
relocs. */
|
|
if (h->dynindx != -1)
|
|
goto keep;
|
|
}
|
|
|
|
eh->dyn_relocs = NULL;
|
|
|
|
keep: ;
|
|
}
|
|
|
|
/* Finally, allocate space. */
|
|
for (p = eh->dyn_relocs; p != NULL; p = p->next)
|
|
{
|
|
asection *sreloc = elf_section_data (p->sec)->sreloc;
|
|
sreloc->_raw_size += p->count * sizeof (Elf32_External_Rela);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Find any dynamic relocs that apply to read-only sections. */
|
|
|
|
static boolean
|
|
readonly_dynrelocs (h, inf)
|
|
struct elf_link_hash_entry *h;
|
|
PTR inf;
|
|
{
|
|
struct elf_s390_link_hash_entry *eh;
|
|
struct elf_s390_dyn_relocs *p;
|
|
|
|
if (h->root.type == bfd_link_hash_warning)
|
|
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
|
|
|
eh = (struct elf_s390_link_hash_entry *) h;
|
|
for (p = eh->dyn_relocs; p != NULL; p = p->next)
|
|
{
|
|
asection *s = p->sec->output_section;
|
|
|
|
if (s != NULL && (s->flags & SEC_READONLY) != 0)
|
|
{
|
|
struct bfd_link_info *info = (struct bfd_link_info *) inf;
|
|
|
|
info->flags |= DF_TEXTREL;
|
|
|
|
/* Not an error, just cut short the traversal. */
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Set the sizes of the dynamic sections. */
|
|
|
|
static boolean
|
|
elf_s390_size_dynamic_sections (output_bfd, info)
|
|
bfd *output_bfd ATTRIBUTE_UNUSED;
|
|
struct bfd_link_info *info;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
bfd *dynobj;
|
|
asection *s;
|
|
boolean relocs;
|
|
bfd *ibfd;
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
dynobj = htab->elf.dynobj;
|
|
if (dynobj == NULL)
|
|
abort ();
|
|
|
|
if (htab->elf.dynamic_sections_created)
|
|
{
|
|
/* Set the contents of the .interp section to the interpreter. */
|
|
if (! info->shared)
|
|
{
|
|
s = bfd_get_section_by_name (dynobj, ".interp");
|
|
if (s == NULL)
|
|
abort ();
|
|
s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
|
|
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
|
|
}
|
|
}
|
|
|
|
/* Set up .got offsets for local syms, and space for local dynamic
|
|
relocs. */
|
|
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
|
|
{
|
|
bfd_signed_vma *local_got;
|
|
bfd_signed_vma *end_local_got;
|
|
bfd_size_type locsymcount;
|
|
Elf_Internal_Shdr *symtab_hdr;
|
|
asection *srela;
|
|
|
|
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
|
|
continue;
|
|
|
|
for (s = ibfd->sections; s != NULL; s = s->next)
|
|
{
|
|
struct elf_s390_dyn_relocs *p;
|
|
|
|
for (p = *((struct elf_s390_dyn_relocs **)
|
|
&elf_section_data (s)->local_dynrel);
|
|
p != NULL;
|
|
p = p->next)
|
|
{
|
|
if (!bfd_is_abs_section (p->sec)
|
|
&& bfd_is_abs_section (p->sec->output_section))
|
|
{
|
|
/* Input section has been discarded, either because
|
|
it is a copy of a linkonce section or due to
|
|
linker script /DISCARD/, so we'll be discarding
|
|
the relocs too. */
|
|
}
|
|
else if (p->count != 0)
|
|
{
|
|
srela = elf_section_data (p->sec)->sreloc;
|
|
srela->_raw_size += p->count * sizeof (Elf32_External_Rela);
|
|
if ((p->sec->output_section->flags & SEC_READONLY) != 0)
|
|
info->flags |= DF_TEXTREL;
|
|
}
|
|
}
|
|
}
|
|
|
|
local_got = elf_local_got_refcounts (ibfd);
|
|
if (!local_got)
|
|
continue;
|
|
|
|
symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
|
|
locsymcount = symtab_hdr->sh_info;
|
|
end_local_got = local_got + locsymcount;
|
|
s = htab->sgot;
|
|
srela = htab->srelgot;
|
|
for (; local_got < end_local_got; ++local_got)
|
|
{
|
|
if (*local_got > 0)
|
|
{
|
|
*local_got = s->_raw_size;
|
|
s->_raw_size += GOT_ENTRY_SIZE;
|
|
if (info->shared)
|
|
srela->_raw_size += sizeof (Elf32_External_Rela);
|
|
}
|
|
else
|
|
*local_got = (bfd_vma) -1;
|
|
}
|
|
}
|
|
|
|
/* Allocate global sym .plt and .got entries, and space for global
|
|
sym dynamic relocs. */
|
|
elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
|
|
|
|
/* We now have determined the sizes of the various dynamic sections.
|
|
Allocate memory for them. */
|
|
relocs = false;
|
|
for (s = dynobj->sections; s != NULL; s = s->next)
|
|
{
|
|
if ((s->flags & SEC_LINKER_CREATED) == 0)
|
|
continue;
|
|
|
|
if (s == htab->splt
|
|
|| s == htab->sgot
|
|
|| s == htab->sgotplt)
|
|
{
|
|
/* Strip this section if we don't need it; see the
|
|
comment below. */
|
|
}
|
|
else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
|
|
{
|
|
if (s->_raw_size != 0 && s != htab->srelplt)
|
|
relocs = true;
|
|
|
|
/* We use the reloc_count field as a counter if we need
|
|
to copy relocs into the output file. */
|
|
s->reloc_count = 0;
|
|
}
|
|
else
|
|
{
|
|
/* It's not one of our sections, so don't allocate space. */
|
|
continue;
|
|
}
|
|
|
|
if (s->_raw_size == 0)
|
|
{
|
|
/* If we don't need this section, strip it from the
|
|
output file. This is to handle .rela.bss and
|
|
.rela.plt. We must create it in
|
|
create_dynamic_sections, because it must be created
|
|
before the linker maps input sections to output
|
|
sections. The linker does that before
|
|
adjust_dynamic_symbol is called, and it is that
|
|
function which decides whether anything needs to go
|
|
into these sections. */
|
|
|
|
_bfd_strip_section_from_output (info, s);
|
|
continue;
|
|
}
|
|
|
|
/* Allocate memory for the section contents. We use bfd_zalloc
|
|
here in case unused entries are not reclaimed before the
|
|
section's contents are written out. This should not happen,
|
|
but this way if it does, we get a R_390_NONE reloc instead
|
|
of garbage. */
|
|
s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
|
|
if (s->contents == NULL)
|
|
return false;
|
|
}
|
|
|
|
if (htab->elf.dynamic_sections_created)
|
|
{
|
|
/* Add some entries to the .dynamic section. We fill in the
|
|
values later, in elf_s390_finish_dynamic_sections, but we
|
|
must add the entries now so that we get the correct size for
|
|
the .dynamic section. The DT_DEBUG entry is filled in by the
|
|
dynamic linker and used by the debugger. */
|
|
#define add_dynamic_entry(TAG, VAL) \
|
|
bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
|
|
|
|
if (! info->shared)
|
|
{
|
|
if (!add_dynamic_entry (DT_DEBUG, 0))
|
|
return false;
|
|
}
|
|
|
|
if (htab->splt->_raw_size != 0)
|
|
{
|
|
if (!add_dynamic_entry (DT_PLTGOT, 0)
|
|
|| !add_dynamic_entry (DT_PLTRELSZ, 0)
|
|
|| !add_dynamic_entry (DT_PLTREL, DT_RELA)
|
|
|| !add_dynamic_entry (DT_JMPREL, 0))
|
|
return false;
|
|
}
|
|
|
|
if (relocs)
|
|
{
|
|
if (!add_dynamic_entry (DT_RELA, 0)
|
|
|| !add_dynamic_entry (DT_RELASZ, 0)
|
|
|| !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
|
|
return false;
|
|
|
|
/* If any dynamic relocs apply to a read-only section,
|
|
then we need a DT_TEXTREL entry. */
|
|
if ((info->flags & DF_TEXTREL) == 0)
|
|
elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
|
|
(PTR) info);
|
|
|
|
if ((info->flags & DF_TEXTREL) != 0)
|
|
{
|
|
if (!add_dynamic_entry (DT_TEXTREL, 0))
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
#undef add_dynamic_entry
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Relocate a 390 ELF section. */
|
|
|
|
static boolean
|
|
elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
|
|
contents, relocs, local_syms, local_sections)
|
|
bfd *output_bfd;
|
|
struct bfd_link_info *info;
|
|
bfd *input_bfd;
|
|
asection *input_section;
|
|
bfd_byte *contents;
|
|
Elf_Internal_Rela *relocs;
|
|
Elf_Internal_Sym *local_syms;
|
|
asection **local_sections;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
Elf_Internal_Shdr *symtab_hdr;
|
|
struct elf_link_hash_entry **sym_hashes;
|
|
bfd_vma *local_got_offsets;
|
|
Elf_Internal_Rela *rel;
|
|
Elf_Internal_Rela *relend;
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
|
sym_hashes = elf_sym_hashes (input_bfd);
|
|
local_got_offsets = elf_local_got_offsets (input_bfd);
|
|
|
|
rel = relocs;
|
|
relend = relocs + input_section->reloc_count;
|
|
for (; rel < relend; rel++)
|
|
{
|
|
int r_type;
|
|
reloc_howto_type *howto;
|
|
unsigned long r_symndx;
|
|
struct elf_link_hash_entry *h;
|
|
Elf_Internal_Sym *sym;
|
|
asection *sec;
|
|
bfd_vma off;
|
|
bfd_vma relocation;
|
|
boolean unresolved_reloc;
|
|
bfd_reloc_status_type r;
|
|
|
|
r_type = ELF32_R_TYPE (rel->r_info);
|
|
if (r_type == (int) R_390_GNU_VTINHERIT
|
|
|| r_type == (int) R_390_GNU_VTENTRY)
|
|
continue;
|
|
if (r_type < 0 || r_type >= (int) R_390_max)
|
|
{
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return false;
|
|
}
|
|
howto = elf_howto_table + r_type;
|
|
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
|
|
if (info->relocateable)
|
|
{
|
|
/* This is a relocateable link. We don't have to change
|
|
anything, unless the reloc is against a section symbol,
|
|
in which case we have to adjust according to where the
|
|
section symbol winds up in the output section. */
|
|
if (r_symndx < symtab_hdr->sh_info)
|
|
{
|
|
sym = local_syms + r_symndx;
|
|
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
|
|
{
|
|
sec = local_sections[r_symndx];
|
|
rel->r_addend += sec->output_offset + sym->st_value;
|
|
}
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
/* This is a final link. */
|
|
h = NULL;
|
|
sym = NULL;
|
|
sec = NULL;
|
|
unresolved_reloc = false;
|
|
if (r_symndx < symtab_hdr->sh_info)
|
|
{
|
|
sym = local_syms + r_symndx;
|
|
sec = local_sections[r_symndx];
|
|
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
|
|
}
|
|
else
|
|
{
|
|
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
|
while (h->root.type == bfd_link_hash_indirect
|
|
|| h->root.type == bfd_link_hash_warning)
|
|
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
|
|
|
if (h->root.type == bfd_link_hash_defined
|
|
|| h->root.type == bfd_link_hash_defweak)
|
|
{
|
|
sec = h->root.u.def.section;
|
|
if (sec->output_section == NULL)
|
|
{
|
|
/* Set a flag that will be cleared later if we find a
|
|
relocation value for this symbol. output_section
|
|
is typically NULL for symbols satisfied by a shared
|
|
library. */
|
|
unresolved_reloc = true;
|
|
relocation = 0;
|
|
}
|
|
else
|
|
relocation = (h->root.u.def.value
|
|
+ sec->output_section->vma
|
|
+ sec->output_offset);
|
|
}
|
|
else if (h->root.type == bfd_link_hash_undefweak)
|
|
relocation = 0;
|
|
else if (info->shared
|
|
&& (!info->symbolic || info->allow_shlib_undefined)
|
|
&& !info->no_undefined
|
|
&& ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
|
|
relocation = 0;
|
|
else
|
|
{
|
|
if (! ((*info->callbacks->undefined_symbol)
|
|
(info, h->root.root.string, input_bfd,
|
|
input_section, rel->r_offset,
|
|
(!info->shared || info->no_undefined
|
|
|| ELF_ST_VISIBILITY (h->other)))))
|
|
return false;
|
|
relocation = 0;
|
|
}
|
|
}
|
|
|
|
switch (r_type)
|
|
{
|
|
case R_390_GOT12:
|
|
case R_390_GOT16:
|
|
case R_390_GOT32:
|
|
case R_390_GOTENT:
|
|
/* Relocation is to the entry for this symbol in the global
|
|
offset table. */
|
|
if (htab->sgot == NULL)
|
|
abort ();
|
|
|
|
if (h != NULL)
|
|
{
|
|
boolean dyn;
|
|
|
|
off = h->got.offset;
|
|
dyn = htab->elf.dynamic_sections_created;
|
|
if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
|
|
|| (info->shared
|
|
&& (info->symbolic
|
|
|| h->dynindx == -1
|
|
|| (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
|
|
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
|
|
{
|
|
/* This is actually a static link, or it is a
|
|
-Bsymbolic link and the symbol is defined
|
|
locally, or the symbol was forced to be local
|
|
because of a version file. We must initialize
|
|
this entry in the global offset table. Since the
|
|
offset must always be a multiple of 2, we use the
|
|
least significant bit to record whether we have
|
|
initialized it already.
|
|
|
|
When doing a dynamic link, we create a .rel.got
|
|
relocation entry to initialize the value. This
|
|
is done in the finish_dynamic_symbol routine. */
|
|
if ((off & 1) != 0)
|
|
off &= ~1;
|
|
else
|
|
{
|
|
bfd_put_32 (output_bfd, relocation,
|
|
htab->sgot->contents + off);
|
|
h->got.offset |= 1;
|
|
}
|
|
}
|
|
else
|
|
unresolved_reloc = false;
|
|
}
|
|
else
|
|
{
|
|
if (local_got_offsets == NULL)
|
|
abort ();
|
|
|
|
off = local_got_offsets[r_symndx];
|
|
|
|
/* The offset must always be a multiple of 4. We use
|
|
the least significant bit to record whether we have
|
|
already generated the necessary reloc. */
|
|
if ((off & 1) != 0)
|
|
off &= ~1;
|
|
else
|
|
{
|
|
bfd_put_32 (output_bfd, relocation,
|
|
htab->sgot->contents + off);
|
|
|
|
if (info->shared)
|
|
{
|
|
asection *srelgot;
|
|
Elf_Internal_Rela outrel;
|
|
Elf32_External_Rela *loc;
|
|
|
|
srelgot = htab->srelgot;
|
|
if (srelgot == NULL)
|
|
abort ();
|
|
|
|
outrel.r_offset = (htab->sgot->output_section->vma
|
|
+ htab->sgot->output_offset
|
|
+ off);
|
|
outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
|
|
outrel.r_addend = relocation;
|
|
loc = (Elf32_External_Rela *) srelgot->contents;
|
|
loc += srelgot->reloc_count++;
|
|
bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
|
|
}
|
|
|
|
local_got_offsets[r_symndx] |= 1;
|
|
}
|
|
}
|
|
|
|
if (off >= (bfd_vma) -2)
|
|
abort ();
|
|
|
|
relocation = htab->sgot->output_offset + off;
|
|
|
|
/*
|
|
* For @GOTENT the relocation is against the offset between
|
|
* the instruction and the symbols entry in the GOT and not
|
|
* between the start of the GOT and the symbols entry. We
|
|
* add the vma of the GOT to get the correct value.
|
|
*/
|
|
if (r_type == R_390_GOTENT)
|
|
relocation += htab->sgot->output_section->vma;
|
|
|
|
break;
|
|
|
|
case R_390_GOTOFF:
|
|
/* Relocation is relative to the start of the global offset
|
|
table. */
|
|
|
|
/* Note that sgot->output_offset is not involved in this
|
|
calculation. We always want the start of .got. If we
|
|
defined _GLOBAL_OFFSET_TABLE in a different way, as is
|
|
permitted by the ABI, we might have to change this
|
|
calculation. */
|
|
relocation -= htab->sgot->output_section->vma;
|
|
break;
|
|
|
|
case R_390_GOTPC:
|
|
case R_390_GOTPCDBL:
|
|
/* Use global offset table as symbol value. */
|
|
relocation = htab->sgot->output_section->vma;
|
|
unresolved_reloc = false;
|
|
break;
|
|
|
|
case R_390_PLT16DBL:
|
|
case R_390_PLT32DBL:
|
|
case R_390_PLT32:
|
|
/* Relocation is to the entry for this symbol in the
|
|
procedure linkage table. */
|
|
|
|
/* Resolve a PLT32 reloc against a local symbol directly,
|
|
without using the procedure linkage table. */
|
|
if (h == NULL)
|
|
break;
|
|
|
|
if (h->plt.offset == (bfd_vma) -1
|
|
|| htab->splt == NULL)
|
|
{
|
|
/* We didn't make a PLT entry for this symbol. This
|
|
happens when statically linking PIC code, or when
|
|
using -Bsymbolic. */
|
|
break;
|
|
}
|
|
|
|
relocation = (htab->splt->output_section->vma
|
|
+ htab->splt->output_offset
|
|
+ h->plt.offset);
|
|
unresolved_reloc = false;
|
|
break;
|
|
|
|
case R_390_8:
|
|
case R_390_16:
|
|
case R_390_32:
|
|
case R_390_PC16:
|
|
case R_390_PC16DBL:
|
|
case R_390_PC32DBL:
|
|
case R_390_PC32:
|
|
/* r_symndx will be zero only for relocs against symbols
|
|
from removed linkonce sections, or sections discarded by
|
|
a linker script. */
|
|
if (r_symndx == 0
|
|
|| (input_section->flags & SEC_ALLOC) == 0)
|
|
break;
|
|
|
|
if ((info->shared
|
|
&& ((r_type != R_390_PC16
|
|
&& r_type != R_390_PC16DBL
|
|
&& r_type != R_390_PC32DBL
|
|
&& r_type != R_390_PC32)
|
|
|| (h != NULL
|
|
&& h->dynindx != -1
|
|
&& (! info->symbolic
|
|
|| (h->elf_link_hash_flags
|
|
& ELF_LINK_HASH_DEF_REGULAR) == 0))))
|
|
|| (!info->shared
|
|
&& h != NULL
|
|
&& h->dynindx != -1
|
|
&& (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
|
|
&& (((h->elf_link_hash_flags
|
|
& ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
|
&& (h->elf_link_hash_flags
|
|
& ELF_LINK_HASH_DEF_REGULAR) == 0)
|
|
|| h->root.type == bfd_link_hash_undefweak
|
|
|| h->root.type == bfd_link_hash_undefined)))
|
|
{
|
|
Elf_Internal_Rela outrel;
|
|
boolean skip, relocate;
|
|
asection *sreloc;
|
|
Elf32_External_Rela *loc;
|
|
|
|
/* When generating a shared object, these relocations
|
|
are copied into the output file to be resolved at run
|
|
time. */
|
|
|
|
skip = false;
|
|
relocate = false;
|
|
|
|
outrel.r_offset =
|
|
_bfd_elf_section_offset (output_bfd, info, input_section,
|
|
rel->r_offset);
|
|
if (outrel.r_offset == (bfd_vma) -1)
|
|
skip = true;
|
|
else if (outrel.r_offset == (bfd_vma) -2)
|
|
skip = true, relocate = true;
|
|
outrel.r_offset += (input_section->output_section->vma
|
|
+ input_section->output_offset);
|
|
|
|
if (skip)
|
|
memset (&outrel, 0, sizeof outrel);
|
|
else if (h != NULL
|
|
&& h->dynindx != -1
|
|
&& (r_type == R_390_PC16
|
|
|| r_type == R_390_PC16DBL
|
|
|| r_type == R_390_PC32DBL
|
|
|| r_type == R_390_PC32
|
|
|| !info->shared
|
|
|| !info->symbolic
|
|
|| (h->elf_link_hash_flags
|
|
& ELF_LINK_HASH_DEF_REGULAR) == 0))
|
|
{
|
|
outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
|
|
outrel.r_addend = rel->r_addend;
|
|
}
|
|
else
|
|
{
|
|
/* This symbol is local, or marked to become local. */
|
|
relocate = true;
|
|
outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
|
|
outrel.r_addend = relocation + rel->r_addend;
|
|
}
|
|
|
|
sreloc = elf_section_data (input_section)->sreloc;
|
|
if (sreloc == NULL)
|
|
abort ();
|
|
|
|
loc = (Elf32_External_Rela *) sreloc->contents;
|
|
loc += sreloc->reloc_count++;
|
|
bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
|
|
|
|
/* If this reloc is against an external symbol, we do
|
|
not want to fiddle with the addend. Otherwise, we
|
|
need to include the symbol value so that it becomes
|
|
an addend for the dynamic reloc. */
|
|
if (! relocate)
|
|
continue;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (unresolved_reloc
|
|
&& !(info->shared
|
|
&& (input_section->flags & SEC_DEBUGGING) != 0
|
|
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
|
|
(*_bfd_error_handler)
|
|
(_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
|
|
bfd_archive_filename (input_bfd),
|
|
bfd_get_section_name (input_bfd, input_section),
|
|
(long) rel->r_offset,
|
|
h->root.root.string);
|
|
|
|
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
|
|
contents, rel->r_offset,
|
|
relocation, rel->r_addend);
|
|
|
|
if (r != bfd_reloc_ok)
|
|
{
|
|
const char *name;
|
|
|
|
if (h != NULL)
|
|
name = h->root.root.string;
|
|
else
|
|
{
|
|
name = bfd_elf_string_from_elf_section (input_bfd,
|
|
symtab_hdr->sh_link,
|
|
sym->st_name);
|
|
if (name == NULL)
|
|
return false;
|
|
if (*name == '\0')
|
|
name = bfd_section_name (input_bfd, sec);
|
|
}
|
|
|
|
if (r == bfd_reloc_overflow)
|
|
{
|
|
|
|
if (! ((*info->callbacks->reloc_overflow)
|
|
(info, name, howto->name, (bfd_vma) 0,
|
|
input_bfd, input_section, rel->r_offset)))
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s(%s+0x%lx): reloc against `%s': error %d"),
|
|
bfd_archive_filename (input_bfd),
|
|
bfd_get_section_name (input_bfd, input_section),
|
|
(long) rel->r_offset, name, (int) r);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Finish up dynamic symbol handling. We set the contents of various
|
|
dynamic sections here. */
|
|
|
|
static boolean
|
|
elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
|
|
bfd *output_bfd;
|
|
struct bfd_link_info *info;
|
|
struct elf_link_hash_entry *h;
|
|
Elf_Internal_Sym *sym;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
|
|
if (h->plt.offset != (bfd_vma) -1)
|
|
{
|
|
bfd_vma plt_index;
|
|
bfd_vma got_offset;
|
|
Elf_Internal_Rela rela;
|
|
Elf32_External_Rela *loc;
|
|
bfd_vma relative_offset;
|
|
|
|
/* This symbol has an entry in the procedure linkage table. Set
|
|
it up. */
|
|
|
|
if (h->dynindx == -1
|
|
|| htab->splt == NULL
|
|
|| htab->sgotplt == NULL
|
|
|| htab->srelplt == NULL)
|
|
abort ();
|
|
|
|
/* Calc. index no.
|
|
Current offset - size first entry / entry size. */
|
|
plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
|
|
|
|
/* Offset in GOT is PLT index plus GOT headers(3) times 4,
|
|
addr & GOT addr. */
|
|
got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
|
|
|
|
/* S390 uses halfwords for relative branch calc! */
|
|
relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
|
|
(PLT_ENTRY_SIZE * plt_index) + 18) / 2);
|
|
/* If offset is > 32768, branch to a previous branch
|
|
390 can only handle +-64 K jumps. */
|
|
if ( -32768 > (int) relative_offset )
|
|
relative_offset =
|
|
-(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
|
|
|
|
/* Fill in the entry in the procedure linkage table. */
|
|
if (!info->shared)
|
|
{
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
|
|
htab->splt->contents + h->plt.offset);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
|
|
htab->splt->contents + h->plt.offset + 4);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
|
|
htab->splt->contents + h->plt.offset + 8);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
|
|
htab->splt->contents + h->plt.offset + 12);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
|
|
htab->splt->contents + h->plt.offset + 16);
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
|
|
htab->splt->contents + h->plt.offset + 20);
|
|
bfd_put_32 (output_bfd,
|
|
(htab->sgotplt->output_section->vma
|
|
+ htab->sgotplt->output_offset
|
|
+ got_offset),
|
|
htab->splt->contents + h->plt.offset + 24);
|
|
}
|
|
else if (got_offset < 4096)
|
|
{
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
|
|
htab->splt->contents + h->plt.offset);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
|
|
htab->splt->contents + h->plt.offset + 4);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
|
|
htab->splt->contents + h->plt.offset + 8);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
|
|
htab->splt->contents + h->plt.offset + 12);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
|
|
htab->splt->contents + h->plt.offset + 16);
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
|
|
htab->splt->contents + h->plt.offset + 20);
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0,
|
|
htab->splt->contents + h->plt.offset + 24);
|
|
}
|
|
else if (got_offset < 32768)
|
|
{
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
|
|
htab->splt->contents + h->plt.offset);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
|
|
htab->splt->contents + h->plt.offset + 4);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
|
|
htab->splt->contents + h->plt.offset + 8);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
|
|
htab->splt->contents + h->plt.offset + 12);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
|
|
htab->splt->contents + h->plt.offset + 16);
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
|
|
htab->splt->contents + h->plt.offset + 20);
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0,
|
|
htab->splt->contents + h->plt.offset + 24);
|
|
}
|
|
else
|
|
{
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
|
|
htab->splt->contents + h->plt.offset);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
|
|
htab->splt->contents + h->plt.offset + 4);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
|
|
htab->splt->contents + h->plt.offset + 8);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
|
|
htab->splt->contents + h->plt.offset + 12);
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
|
|
htab->splt->contents + h->plt.offset + 16);
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
|
|
htab->splt->contents + h->plt.offset + 20);
|
|
bfd_put_32 (output_bfd, got_offset,
|
|
htab->splt->contents + h->plt.offset + 24);
|
|
}
|
|
/* Insert offset into reloc. table here. */
|
|
bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
|
|
htab->splt->contents + h->plt.offset + 28);
|
|
|
|
/* Fill in the entry in the global offset table.
|
|
Points to instruction after GOT offset. */
|
|
bfd_put_32 (output_bfd,
|
|
(htab->splt->output_section->vma
|
|
+ htab->splt->output_offset
|
|
+ h->plt.offset
|
|
+ 12),
|
|
htab->sgotplt->contents + got_offset);
|
|
|
|
/* Fill in the entry in the .rela.plt section. */
|
|
rela.r_offset = (htab->sgotplt->output_section->vma
|
|
+ htab->sgotplt->output_offset
|
|
+ got_offset);
|
|
rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
|
|
rela.r_addend = 0;
|
|
loc = (Elf32_External_Rela *) htab->srelplt->contents + plt_index;
|
|
bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
|
|
|
|
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
|
{
|
|
/* Mark the symbol as undefined, rather than as defined in
|
|
the .plt section. Leave the value alone. This is a clue
|
|
for the dynamic linker, to make function pointer
|
|
comparisons work between an application and shared
|
|
library. */
|
|
sym->st_shndx = SHN_UNDEF;
|
|
}
|
|
}
|
|
|
|
if (h->got.offset != (bfd_vma) -1)
|
|
{
|
|
Elf_Internal_Rela rela;
|
|
Elf32_External_Rela *loc;
|
|
|
|
/* This symbol has an entry in the global offset table. Set it
|
|
up. */
|
|
|
|
if (htab->sgot == NULL || htab->srelgot == NULL)
|
|
abort ();
|
|
|
|
rela.r_offset = (htab->sgot->output_section->vma
|
|
+ htab->sgot->output_offset
|
|
+ (h->got.offset &~ (bfd_vma) 1));
|
|
|
|
/* If this is a static link, or it is a -Bsymbolic link and the
|
|
symbol is defined locally or was forced to be local because
|
|
of a version file, we just want to emit a RELATIVE reloc.
|
|
The entry in the global offset table will already have been
|
|
initialized in the relocate_section function. */
|
|
if (info->shared
|
|
&& (info->symbolic
|
|
|| h->dynindx == -1
|
|
|| (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
|
|
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
|
|
{
|
|
BFD_ASSERT((h->got.offset & 1) != 0);
|
|
rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
|
|
rela.r_addend = (h->root.u.def.value
|
|
+ h->root.u.def.section->output_section->vma
|
|
+ h->root.u.def.section->output_offset);
|
|
}
|
|
else
|
|
{
|
|
BFD_ASSERT((h->got.offset & 1) == 0);
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
|
|
rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
|
|
rela.r_addend = 0;
|
|
}
|
|
|
|
loc = (Elf32_External_Rela *) htab->srelgot->contents;
|
|
loc += htab->srelgot->reloc_count++;
|
|
bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
|
|
}
|
|
|
|
if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
|
|
{
|
|
Elf_Internal_Rela rela;
|
|
Elf32_External_Rela *loc;
|
|
|
|
/* This symbols needs a copy reloc. Set it up. */
|
|
|
|
if (h->dynindx == -1
|
|
|| (h->root.type != bfd_link_hash_defined
|
|
&& h->root.type != bfd_link_hash_defweak)
|
|
|| htab->srelbss == NULL)
|
|
abort ();
|
|
|
|
rela.r_offset = (h->root.u.def.value
|
|
+ h->root.u.def.section->output_section->vma
|
|
+ h->root.u.def.section->output_offset);
|
|
rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
|
|
rela.r_addend = 0;
|
|
loc = (Elf32_External_Rela *) htab->srelbss->contents;
|
|
loc += htab->srelbss->reloc_count++;
|
|
bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
|
|
}
|
|
|
|
/* Mark some specially defined symbols as absolute. */
|
|
if (strcmp (h->root.root.string, "_DYNAMIC") == 0
|
|
|| strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
|
|
|| strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
|
|
sym->st_shndx = SHN_ABS;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Used to decide how to sort relocs in an optimal manner for the
|
|
dynamic linker, before writing them out. */
|
|
|
|
static enum elf_reloc_type_class
|
|
elf_s390_reloc_type_class (rela)
|
|
const Elf_Internal_Rela *rela;
|
|
{
|
|
switch ((int) ELF32_R_TYPE (rela->r_info))
|
|
{
|
|
case R_390_RELATIVE:
|
|
return reloc_class_relative;
|
|
case R_390_JMP_SLOT:
|
|
return reloc_class_plt;
|
|
case R_390_COPY:
|
|
return reloc_class_copy;
|
|
default:
|
|
return reloc_class_normal;
|
|
}
|
|
}
|
|
|
|
/* Finish up the dynamic sections. */
|
|
|
|
static boolean
|
|
elf_s390_finish_dynamic_sections (output_bfd, info)
|
|
bfd *output_bfd;
|
|
struct bfd_link_info *info;
|
|
{
|
|
struct elf_s390_link_hash_table *htab;
|
|
bfd *dynobj;
|
|
asection *sdyn;
|
|
|
|
htab = elf_s390_hash_table (info);
|
|
dynobj = htab->elf.dynobj;
|
|
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
|
|
|
|
if (htab->elf.dynamic_sections_created)
|
|
{
|
|
Elf32_External_Dyn *dyncon, *dynconend;
|
|
|
|
if (sdyn == NULL || htab->sgot == NULL)
|
|
abort ();
|
|
|
|
dyncon = (Elf32_External_Dyn *) sdyn->contents;
|
|
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
|
|
for (; dyncon < dynconend; dyncon++)
|
|
{
|
|
Elf_Internal_Dyn dyn;
|
|
asection *s;
|
|
|
|
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
|
|
|
|
switch (dyn.d_tag)
|
|
{
|
|
default:
|
|
continue;
|
|
|
|
case DT_PLTGOT:
|
|
dyn.d_un.d_ptr = htab->sgot->output_section->vma;
|
|
break;
|
|
|
|
case DT_JMPREL:
|
|
dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
|
|
break;
|
|
|
|
case DT_PLTRELSZ:
|
|
s = htab->srelplt->output_section;
|
|
if (s->_cooked_size != 0)
|
|
dyn.d_un.d_val = s->_cooked_size;
|
|
else
|
|
dyn.d_un.d_val = s->_raw_size;
|
|
break;
|
|
}
|
|
|
|
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
|
|
}
|
|
|
|
/* Fill in the special first entry in the procedure linkage table. */
|
|
if (htab->splt && htab->splt->_raw_size > 0)
|
|
{
|
|
memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
|
|
if (info->shared)
|
|
{
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
|
|
htab->splt->contents );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
|
|
htab->splt->contents +4 );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
|
|
htab->splt->contents +8 );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
|
|
htab->splt->contents +12 );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
|
|
htab->splt->contents +16 );
|
|
}
|
|
else
|
|
{
|
|
bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
|
|
htab->splt->contents );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
|
|
htab->splt->contents +4 );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
|
|
htab->splt->contents +8 );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
|
|
htab->splt->contents +12 );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
|
|
htab->splt->contents +16 );
|
|
bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
|
|
htab->splt->contents +20 );
|
|
bfd_put_32 (output_bfd,
|
|
htab->sgotplt->output_section->vma
|
|
+ htab->sgotplt->output_offset,
|
|
htab->splt->contents + 24);
|
|
}
|
|
elf_section_data (htab->splt->output_section)
|
|
->this_hdr.sh_entsize = 4;
|
|
}
|
|
|
|
}
|
|
|
|
if (htab->sgotplt)
|
|
{
|
|
/* Fill in the first three entries in the global offset table. */
|
|
if (htab->sgotplt->_raw_size > 0)
|
|
{
|
|
bfd_put_32 (output_bfd,
|
|
(sdyn == NULL ? (bfd_vma) 0
|
|
: sdyn->output_section->vma + sdyn->output_offset),
|
|
htab->sgotplt->contents);
|
|
/* One entry for shared object struct ptr. */
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
|
|
/* One entry for _dl_runtime_resolve. */
|
|
bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
|
|
}
|
|
|
|
elf_section_data (htab->sgotplt->output_section)
|
|
->this_hdr.sh_entsize = 4;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static boolean
|
|
elf_s390_object_p (abfd)
|
|
bfd *abfd;
|
|
{
|
|
return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
|
|
}
|
|
|
|
static boolean
|
|
elf_s390_grok_prstatus (abfd, note)
|
|
bfd * abfd;
|
|
Elf_Internal_Note * note;
|
|
{
|
|
int offset;
|
|
unsigned int raw_size;
|
|
|
|
switch (note->descsz)
|
|
{
|
|
default:
|
|
return false;
|
|
|
|
case 224: /* S/390 Linux. */
|
|
/* pr_cursig */
|
|
elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
|
|
|
|
/* pr_pid */
|
|
elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
|
|
|
|
/* pr_reg */
|
|
offset = 72;
|
|
raw_size = 144;
|
|
break;
|
|
}
|
|
|
|
/* Make a ".reg/999" section. */
|
|
return _bfd_elfcore_make_pseudosection (abfd, ".reg",
|
|
raw_size, note->descpos + offset);
|
|
}
|
|
|
|
#define TARGET_BIG_SYM bfd_elf32_s390_vec
|
|
#define TARGET_BIG_NAME "elf32-s390"
|
|
#define ELF_ARCH bfd_arch_s390
|
|
#define ELF_MACHINE_CODE EM_S390
|
|
#define ELF_MACHINE_ALT1 EM_S390_OLD
|
|
#define ELF_MAXPAGESIZE 0x1000
|
|
|
|
#define elf_backend_can_gc_sections 1
|
|
#define elf_backend_can_refcount 1
|
|
#define elf_backend_want_got_plt 1
|
|
#define elf_backend_plt_readonly 1
|
|
#define elf_backend_want_plt_sym 0
|
|
#define elf_backend_got_header_size 12
|
|
#define elf_backend_plt_header_size PLT_ENTRY_SIZE
|
|
|
|
#define elf_info_to_howto elf_s390_info_to_howto
|
|
|
|
#define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
|
|
#define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
|
|
#define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
|
|
|
|
#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
|
|
#define elf_backend_check_relocs elf_s390_check_relocs
|
|
#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
|
|
#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
|
|
#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
|
|
#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
|
|
#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
|
|
#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
|
|
#define elf_backend_reloc_type_class elf_s390_reloc_type_class
|
|
#define elf_backend_relocate_section elf_s390_relocate_section
|
|
#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
|
|
#define elf_backend_reloc_type_class elf_s390_reloc_type_class
|
|
#define elf_backend_grok_prstatus elf_s390_grok_prstatus
|
|
|
|
#define elf_backend_object_p elf_s390_object_p
|
|
|
|
#include "elf32-target.h"
|