binutils-gdb/bfd/elf-vxworks.c

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2005-05-05 Paul Brook <paul@codesourcery.com> bfd/ * config.bfd: Use bfd_elf32_i386_vxworks_vec for i?86-*-vxworks. * configure.in: Add bfd_elf32_i386_vxworks_vec. i386 targets need elf-vxworks.lo. * configure: Regenerate. * Makefile.am (BFD32_BACKENDS): Add elf-vxworks.lo. (BFD32_BACKENDS_CFILES): Add elf-vxworks.c. (elf32-i386.lo): Depend on elf-vxworks.h. (elf-vxworks.lo): New rule. * Makefile.in: Regenerate. * elf-bfd.h (elf_backend_data): Update type of elf_backend_emit_relocs. (_bfd_elf_link_output_relocs): Update prototype. * elflink.c (_bfd_elf_link_output_relocs): Always use bed->elf_backend_emit_relocs when outputting relocations. * elfxx-target.h (elf_backend_emit_relocs): Default to _bfd_elf_link_output_relocs. * targets.c (bfd_elf32_i386_vxworks_vec): Declare. (_bfd_target_vector): Add bfd_elf32_i386_vxworks_vec. * elf32-i386.c: Add elf32-i386-vxworks target BFD. (elf_i386_plt0_entry): Remove padding. (elf_i386_pic_plt0_entry): Ditto. (PLTRESOLVE_RELOCS_SHLIB, PLTRESOLVE_RELOCS): Define. (PLT_NON_JUMP_SLOT_RELOCS): Define. (elf_i386_link_hash_table): Add srelplt2, hgot, hplt, is_vxworks and plt0_pad_byte fields. (elf_i386_link_hash_table_create): Zero them. (elf_i386_create_dynamic_sections): Create static relocation section. (allocate_dynrelocs): Allocate space for static PLT relocations. (elf_i386_size_dynamic_sections): Save shortcuts to PLT and GOT symbols. Give PLT symbols function type. Don't strip PLT sections if we have exported symbols from them. (elf_i386_finish_dynamic_symbol): Fill in VxWorks PLT static relocation section. Don't mark _GLOBAL_OFFSET_TABLE_ as absolute on VxWorks. (elf_i386_finish_dynamic_sections): Allow different pad bytes. Add relocation for GOT location. Fill in PLT static relocations. (elf_i386_vxworks_link_hash_table_create): New function. (elf_i386_vxworks_link_output_symbol_hook): New function. * elf-vxworks.h: New file. gas/ * config/tc-i386.h (ELF_TARGET_FORMAT): Define for TE_VXWORKS. gas/testsuite/ * gas/i386/i386.exp: Don't run divide test on vxworks. ld/ * Makefile.am: Add eelf_i386_vxworks. * Makefile.in: Regenerate. * configure.tgt: Make i?86-*-vxworks use targ_emul=elf_i386_vxworks. * emulparams/elf_i386_vxworks.sh: New file. * emulparams/vxworks.sh: New file. * scripttempl/elf.sc: Add DATA_END_SYMBOLS and ETEXT_NAME.
2005-05-05 16:37:27 +02:00
/* 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");
2005-05-07 Paul Brook <paul@codesourcery.com> bfd/ * config.bfd: Add separate case for ppc-vxworks. * configure: Regenerate. * configure.in: Include elf-vxworks.lo on ppc targets. * elf-vxworks.c (elf_vxworks_final_write_processing): Handle .rela.plt.unloaded. * elf32-ppc.c: Add VxWorks target vec. Include elf-vxworks.h. (PLT_ENTRY_SIZE, PLT_INITIAL_ENTRY_SIZE, PLT_SLOT_SIZE): Remove. (VXWORKS_PLT_ENTRY_SIZE, ppc_elf_vxworks_plt_entry, ppc_elf_vxworks_pic_plt_entry, VXWORKS_PLT_INITIAL_ENTRY_SIZE, ppc_elf_vxworks_plt0_entry, ppc_elf_vxworks_pic_plt0_entry, VXWORKS_PLT_NON_JMP_SLOT_RELOCS, VXWORKS_PLTRESOLVE_RELOCS, VXWORKS_PLTRESOLVE_RELOCS_SHLIB): New. (ppc_elf_link_hash_table): Add srelplt2, sgotplt, hgot, hplt, is_vxworks, plt_entry_size, plt_slot_size, plt_initial_entry_size. (ppc_elf_link_hash_table_create): Initialize hadtab plt fields. (ppc_elf_create_got): Create .got.plt for VxWorks. (ppc_elf_create_dynamic_sections): Create unloaded plt relocation section for VxWorks. (ppc_elf_select_plt_layout): Handle VxWorks plt format. (allocate_got): VxWorks does not need a got header. (allocate_dynrelocs): Handle VxWorks plt format. (ppc_elf_size_dynamic_sections): Save _G_O_T_ and _P_L_T_ symbols for VxWorks. Handle VxWorks plt/got. (ppc_elf_finish_dynamic_sections): Fill in VxWorks plt. (ppc_elf_vxworks_special_sections): New. (ppc_elf_vxworks_link_hash_table_create, ppc_elf_vxworks_add_symbol_hook, elf_i386_vxworks_link_output_symbol_hook, ppc_elf_vxworks_final_write_processing): New functions. * targets.c (bfd_elf32_powerpc_vxworks_vec): Declare. (_bfd_target_vector): Use it. gas/ * config/tc-ppc.c (ppc_target_format): Add VxWorks. gas/testsuite/ * gas/ppc/altivec.d: Match all powerpc target vecs. * gas/ppc/booke.d: Ditto. * gas/ppc/e500.d: Ditto. ld/ * Makefile.am (ALL_EMULATIONS): Add eelf32ppcvxworks.o. (eelf32ppcvxworks.o): Add dependencies. * Makefile.in: Regenerate. * configure.tgt: Add entry for powerpc-vxworks. * emulparams/elf32-ppc.c: Mention elf32ppcvxworks.sh in comment. * emulparams/elf32ppcvxworks.sh: New file. * emultempl/ppc32elf.em (bfd_elf32_powerpc_vxworks_vec): Declare. (is_ppc_elf32_vec): New function. (ppc_after_open, ppc_before_allocation, gld${EMULATION_NAME}_after_allocation): Use it.
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if (!sec)
sec = bfd_get_section_by_name (abfd, ".rela.plt.unloaded");
2005-05-05 Paul Brook <paul@codesourcery.com> bfd/ * config.bfd: Use bfd_elf32_i386_vxworks_vec for i?86-*-vxworks. * configure.in: Add bfd_elf32_i386_vxworks_vec. i386 targets need elf-vxworks.lo. * configure: Regenerate. * Makefile.am (BFD32_BACKENDS): Add elf-vxworks.lo. (BFD32_BACKENDS_CFILES): Add elf-vxworks.c. (elf32-i386.lo): Depend on elf-vxworks.h. (elf-vxworks.lo): New rule. * Makefile.in: Regenerate. * elf-bfd.h (elf_backend_data): Update type of elf_backend_emit_relocs. (_bfd_elf_link_output_relocs): Update prototype. * elflink.c (_bfd_elf_link_output_relocs): Always use bed->elf_backend_emit_relocs when outputting relocations. * elfxx-target.h (elf_backend_emit_relocs): Default to _bfd_elf_link_output_relocs. * targets.c (bfd_elf32_i386_vxworks_vec): Declare. (_bfd_target_vector): Add bfd_elf32_i386_vxworks_vec. * elf32-i386.c: Add elf32-i386-vxworks target BFD. (elf_i386_plt0_entry): Remove padding. (elf_i386_pic_plt0_entry): Ditto. (PLTRESOLVE_RELOCS_SHLIB, PLTRESOLVE_RELOCS): Define. (PLT_NON_JUMP_SLOT_RELOCS): Define. (elf_i386_link_hash_table): Add srelplt2, hgot, hplt, is_vxworks and plt0_pad_byte fields. (elf_i386_link_hash_table_create): Zero them. (elf_i386_create_dynamic_sections): Create static relocation section. (allocate_dynrelocs): Allocate space for static PLT relocations. (elf_i386_size_dynamic_sections): Save shortcuts to PLT and GOT symbols. Give PLT symbols function type. Don't strip PLT sections if we have exported symbols from them. (elf_i386_finish_dynamic_symbol): Fill in VxWorks PLT static relocation section. Don't mark _GLOBAL_OFFSET_TABLE_ as absolute on VxWorks. (elf_i386_finish_dynamic_sections): Allow different pad bytes. Add relocation for GOT location. Fill in PLT static relocations. (elf_i386_vxworks_link_hash_table_create): New function. (elf_i386_vxworks_link_output_symbol_hook): New function. * elf-vxworks.h: New file. gas/ * config/tc-i386.h (ELF_TARGET_FORMAT): Define for TE_VXWORKS. gas/testsuite/ * gas/i386/i386.exp: Don't run divide test on vxworks. ld/ * Makefile.am: Add eelf_i386_vxworks. * Makefile.in: Regenerate. * configure.tgt: Make i?86-*-vxworks use targ_emul=elf_i386_vxworks. * emulparams/elf_i386_vxworks.sh: New file. * emulparams/vxworks.sh: New file. * scripttempl/elf.sc: Add DATA_END_SYMBOLS and ETEXT_NAME.
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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;
}