| /* VxWorks support for ELF |
| Copyright 2005 Free Software Foundation, Inc. |
| |
| This file is part of BFD, the Binary File Descriptor library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| /* This file provides routines used by all VxWorks targets. */ |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| #include "libbfd.h" |
| #include "elf-bfd.h" |
| #include "elf-vxworks.h" |
| |
| /* Tweak magic VxWorks symbols as they are loaded. */ |
| bfd_boolean |
| elf_vxworks_add_symbol_hook (bfd *abfd ATTRIBUTE_UNUSED, |
| struct bfd_link_info *info, |
| Elf_Internal_Sym *sym, |
| const char **namep, |
| flagword *flagsp, |
| asection **secp ATTRIBUTE_UNUSED, |
| bfd_vma *valp ATTRIBUTE_UNUSED) |
| { |
| /* Ideally these "magic" symbols would be exported by libc.so.1 |
| which would be found via a DT_NEEDED tag, and then handled |
| specially by the linker at runtime. Except shared libraries |
| don't even link to libc.so.1 by default... |
| If the symbol is imported from, or will be put in a shared library, |
| give the symbol weak binding to get the desired samantics. |
| This transformation will be undone in |
| elf_i386_vxworks_link_output_symbol_hook. */ |
| if ((info->shared || abfd->flags & DYNAMIC) |
| && (strcmp (*namep, "__GOTT_INDEX__") == 0 |
| || strcmp (*namep, "__GOTT_BASE__") == 0)) |
| { |
| sym->st_info = ELF_ST_INFO (STB_WEAK, ELF_ST_TYPE (sym->st_info)); |
| *flagsp |= BSF_WEAK; |
| } |
| |
| return TRUE; |
| } |
| |
| |
| /* Tweak magic VxWorks symbols as they are written to the output file. */ |
| bfd_boolean |
| elf_vxworks_link_output_symbol_hook (const char *name, |
| Elf_Internal_Sym *sym) |
| { |
| /* Reverse the effects of the hack in elf_vxworks_add_symbol_hook. */ |
| if (strcmp (name, "__GOTT_INDEX__") == 0 |
| || strcmp (name, "__GOTT_BASE__") == 0) |
| sym->st_info = ELF_ST_INFO (STB_GLOBAL, ELF_ST_TYPE (sym->st_info)); |
| |
| return TRUE; |
| } |
| |
| |
| /* Copy relocations into the output file. Fixes up relocations againt PLT |
| entries, then calls the generic routine. */ |
| |
| bfd_boolean |
| elf_vxworks_emit_relocs (bfd *output_bfd, |
| asection *input_section, |
| Elf_Internal_Shdr *input_rel_hdr, |
| Elf_Internal_Rela *internal_relocs, |
| struct elf_link_hash_entry **rel_hash) |
| { |
| const struct elf_backend_data *bed; |
| Elf_Internal_Rela *irela; |
| Elf_Internal_Rela *irelaend; |
| int j; |
| |
| bed = get_elf_backend_data (output_bfd); |
| |
| irela = internal_relocs; |
| irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr) |
| * bed->s->int_rels_per_ext_rel); |
| while (irela < irelaend) |
| { |
| if ((output_bfd->flags & (DYNAMIC|EXEC_P)) |
| && *rel_hash |
| && (*rel_hash)->def_dynamic |
| && !(*rel_hash)->def_regular |
| && (*rel_hash)->root.type == bfd_link_hash_defined |
| && (*rel_hash)->root.u.def.section->output_section != NULL) |
| { |
| /* This is a relocation from an executable or shared library |
| against a symbol in a different shared library. We are |
| creating a definition in the output file but it does not come |
| from any of our normal (.o) files. ie. a PLT stub. |
| Normally this would be a relocation against against SHN_UNDEF |
| with the VMA of the PLT stub. This upsets the VxWorks loader. |
| Convert it to a section-relative relocation. |
| This gets some other symbols (for instance .dynbss), |
| but is conservatively correct. */ |
| for (j = 0; j < bed->s->int_rels_per_ext_rel; j++) |
| { |
| asection *sec = (*rel_hash)->root.u.def.section; |
| int this_idx = |
| elf_section_data (sec->output_section)->this_idx; |
| |
| irela[j].r_info = ELF32_R_INFO (this_idx, |
| ELF32_R_TYPE (irela[j].r_info)); |
| irela[j].r_addend += (*rel_hash)->root.u.def.value; |
| irela[j].r_addend += sec->output_offset; |
| } |
| /* Stop the generic routine adjusting this entry. */ |
| *rel_hash = NULL; |
| } |
| irela += bed->s->int_rels_per_ext_rel; |
| rel_hash++; |
| } |
| return _bfd_elf_link_output_relocs (output_bfd, input_section, |
| input_rel_hdr, internal_relocs, |
| rel_hash); |
| } |
| |
| |
| /* Set the sh_link and sh_info fields on the static plt relocation secton. */ |
| |
| void |
| elf_vxworks_final_write_processing (bfd *abfd, |
| bfd_boolean linker ATTRIBUTE_UNUSED) |
| { |
| asection * sec; |
| struct bfd_elf_section_data *d; |
| |
| sec = bfd_get_section_by_name (abfd, ".rel.plt.unloaded"); |
| if (!sec) |
| sec = bfd_get_section_by_name (abfd, ".rela.plt.unloaded"); |
| if (!sec) |
| return; |
| d = elf_section_data (sec); |
| d->this_hdr.sh_link = elf_tdata (abfd)->symtab_section; |
| sec = bfd_get_section_by_name (abfd, ".plt"); |
| if (sec) |
| d->this_hdr.sh_info = elf_section_data (sec)->this_idx; |
| } |