/* VxWorks support for ELF
- Copyright 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005-2020 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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.
- */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* This file provides routines used by all VxWorks targets. */
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf-vxworks.h"
+#include "elf/vxworks.h"
+
+/* Return true if symbol NAME, as defined by ABFD, is one of the special
+ __GOTT_BASE__ or __GOTT_INDEX__ symbols. */
+
+static bfd_boolean
+elf_vxworks_gott_symbol_p (bfd *abfd, const char *name)
+{
+ char leading;
+
+ leading = bfd_get_symbol_leading_char (abfd);
+ if (leading)
+ {
+ if (*name != leading)
+ return FALSE;
+ name++;
+ }
+ return (strcmp (name, "__GOTT_BASE__") == 0
+ || strcmp (name, "__GOTT_INDEX__") == 0);
+}
/* Tweak magic VxWorks symbols as they are loaded. */
bfd_boolean
-elf_vxworks_add_symbol_hook (bfd *abfd ATTRIBUTE_UNUSED,
+elf_vxworks_add_symbol_hook (bfd *abfd,
struct bfd_link_info *info,
Elf_Internal_Sym *sym,
const char **namep,
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))
+ if ((bfd_link_pic (info) || abfd->flags & DYNAMIC)
+ && elf_vxworks_gott_symbol_p (abfd, *namep))
{
sym->st_info = ELF_ST_INFO (STB_WEAK, ELF_ST_TYPE (sym->st_info));
*flagsp |= BSF_WEAK;
return TRUE;
}
+/* Perform VxWorks-specific handling of the create_dynamic_sections hook.
+ When creating an executable, set *SRELPLT2_OUT to the .rel(a).plt.unloaded
+ section. */
-/* 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)
+elf_vxworks_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info,
+ asection **srelplt2_out)
{
- /* 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));
+ struct elf_link_hash_table *htab;
+ const struct elf_backend_data *bed;
+ asection *s;
+
+ htab = elf_hash_table (info);
+ bed = get_elf_backend_data (dynobj);
+
+ if (!bfd_link_pic (info))
+ {
+ s = bfd_make_section_anyway_with_flags (dynobj,
+ bed->default_use_rela_p
+ ? ".rela.plt.unloaded"
+ : ".rel.plt.unloaded",
+ SEC_HAS_CONTENTS | SEC_IN_MEMORY
+ | SEC_READONLY
+ | SEC_LINKER_CREATED);
+ if (s == NULL
+ || !bfd_set_section_alignment (s, bed->s->log_file_align))
+ return FALSE;
+
+ *srelplt2_out = s;
+ }
+
+ /* Mark the GOT and PLT symbols as having relocations; they might
+ not, but we won't know for sure until we build the GOT in
+ finish_dynamic_symbol. Also make sure that the GOT symbol
+ is entered into the dynamic symbol table; the loader uses it
+ to initialize __GOTT_BASE__[__GOTT_INDEX__]. */
+ if (htab->hgot)
+ {
+ htab->hgot->indx = -2;
+ htab->hgot->other &= ~ELF_ST_VISIBILITY (-1);
+ htab->hgot->forced_local = 0;
+ if (!bfd_elf_link_record_dynamic_symbol (info, htab->hgot))
+ return FALSE;
+ }
+ if (htab->hplt)
+ {
+ htab->hplt->indx = -2;
+ htab->hplt->type = STT_FUNC;
+ }
return TRUE;
}
+/* Tweak magic VxWorks symbols as they are written to the output file. */
+int
+elf_vxworks_link_output_symbol_hook (struct bfd_link_info *info
+ ATTRIBUTE_UNUSED,
+ const char *name,
+ Elf_Internal_Sym *sym,
+ asection *input_sec ATTRIBUTE_UNUSED,
+ struct elf_link_hash_entry *h)
+{
+ /* Reverse the effects of the hack in elf_vxworks_add_symbol_hook. */
+ if (h
+ && h->root.type == bfd_link_hash_undefweak
+ && elf_vxworks_gott_symbol_p (h->root.u.undef.abfd, name))
+ sym->st_info = ELF_ST_INFO (STB_GLOBAL, ELF_ST_TYPE (sym->st_info));
-/* Copy relocations into the output file. Fixes up relocations againt PLT
+ return 1;
+}
+
+/* Copy relocations into the output file. Fixes up relocations against PLT
entries, then calls the generic routine. */
bfd_boolean
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))
{
- 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)
+ Elf_Internal_Rela *irela;
+ Elf_Internal_Rela *irelaend;
+ struct elf_link_hash_entry **hash_ptr;
+
+ for (irela = internal_relocs,
+ irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
+ * bed->s->int_rels_per_ext_rel),
+ hash_ptr = rel_hash;
+ irela < irelaend;
+ irela += bed->s->int_rels_per_ext_rel,
+ hash_ptr++)
{
- /* 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++)
+ if (*hash_ptr
+ && (*hash_ptr)->def_dynamic
+ && !(*hash_ptr)->def_regular
+ && ((*hash_ptr)->root.type == bfd_link_hash_defined
+ || (*hash_ptr)->root.type == bfd_link_hash_defweak)
+ && (*hash_ptr)->root.u.def.section->output_section != NULL)
{
- 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;
+ /* 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 = (*hash_ptr)->root.u.def.section;
+ int this_idx = sec->output_section->target_index;
+
+ irela[j].r_info
+ = ELF32_R_INFO (this_idx, ELF32_R_TYPE (irela[j].r_info));
+ irela[j].r_addend += (*hash_ptr)->root.u.def.value;
+ irela[j].r_addend += sec->output_offset;
+ }
+ /* Stop the generic routine adjusting this entry. */
+ *hash_ptr = NULL;
}
- /* 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,
/* 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)
+bfd_boolean
+elf_vxworks_final_write_processing (bfd *abfd)
{
asection * sec;
struct bfd_elf_section_data *d;
sec = bfd_get_section_by_name (abfd, ".rel.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");
+ sec = bfd_get_section_by_name (abfd, ".rela.plt.unloaded");
if (sec)
- d->this_hdr.sh_info = elf_section_data (sec)->this_idx;
+ {
+ d = elf_section_data (sec);
+ d->this_hdr.sh_link = elf_onesymtab (abfd);
+ sec = bfd_get_section_by_name (abfd, ".plt");
+ if (sec)
+ d->this_hdr.sh_info = elf_section_data (sec)->this_idx;
+ }
+ return _bfd_elf_final_write_processing (abfd);
+}
+
+/* Add the dynamic entries required by VxWorks. These point to the
+ tls sections. */
+
+bfd_boolean
+elf_vxworks_add_dynamic_entries (bfd *output_bfd, struct bfd_link_info *info)
+{
+ if (bfd_get_section_by_name (output_bfd, ".tls_data"))
+ {
+ if (!_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_START, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_SIZE, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_ALIGN, 0))
+ return FALSE;
+ }
+ if (bfd_get_section_by_name (output_bfd, ".tls_vars"))
+ {
+ if (!_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_VARS_START, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_VARS_SIZE, 0))
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/* If *DYN is one of the VxWorks-specific dynamic entries, then fill
+ in the value now and return TRUE. Otherwise return FALSE. */
+
+bfd_boolean
+elf_vxworks_finish_dynamic_entry (bfd *output_bfd, Elf_Internal_Dyn *dyn)
+{
+ asection *sec;
+
+ switch (dyn->d_tag)
+ {
+ default:
+ return FALSE;
+
+ case DT_VX_WRS_TLS_DATA_START:
+ sec = bfd_get_section_by_name (output_bfd, ".tls_data");
+ dyn->d_un.d_ptr = sec->vma;
+ break;
+
+ case DT_VX_WRS_TLS_DATA_SIZE:
+ sec = bfd_get_section_by_name (output_bfd, ".tls_data");
+ dyn->d_un.d_val = sec->size;
+ break;
+
+ case DT_VX_WRS_TLS_DATA_ALIGN:
+ sec = bfd_get_section_by_name (output_bfd, ".tls_data");
+ dyn->d_un.d_val = (bfd_size_type) 1 << bfd_section_alignment (sec);
+ break;
+
+ case DT_VX_WRS_TLS_VARS_START:
+ sec = bfd_get_section_by_name (output_bfd, ".tls_vars");
+ dyn->d_un.d_ptr = sec->vma;
+ break;
+
+ case DT_VX_WRS_TLS_VARS_SIZE:
+ sec = bfd_get_section_by_name (output_bfd, ".tls_vars");
+ dyn->d_un.d_val = sec->size;
+ break;
+ }
+ return TRUE;
}
+
+
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