diff options
Diffstat (limited to 'bfd/elflink.c')
| -rw-r--r-- | bfd/elflink.c | 436 |
1 files changed, 0 insertions, 436 deletions
diff --git a/bfd/elflink.c b/bfd/elflink.c deleted file mode 100644 index 829d977aaeb..00000000000 --- a/bfd/elflink.c +++ /dev/null @@ -1,436 +0,0 @@ -/* ELF linking support for BFD. - Copyright 1995, 1996, 1997, 1999 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. */ - -#include "bfd.h" -#include "sysdep.h" -#include "bfdlink.h" -#include "libbfd.h" -#define ARCH_SIZE 0 -#include "elf-bfd.h" - -boolean -_bfd_elf_create_got_section (abfd, info) - bfd *abfd; - struct bfd_link_info *info; -{ - flagword flags; - register asection *s; - struct elf_link_hash_entry *h; - struct elf_backend_data *bed = get_elf_backend_data (abfd); - int ptralign; - - /* This function may be called more than once. */ - if (bfd_get_section_by_name (abfd, ".got") != NULL) - return true; - - switch (bed->s->arch_size) - { - case 32: ptralign = 2; break; - case 64: ptralign = 3; break; - default: abort(); - } - - flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY - | SEC_LINKER_CREATED); - - s = bfd_make_section (abfd, ".got"); - if (s == NULL - || !bfd_set_section_flags (abfd, s, flags) - || !bfd_set_section_alignment (abfd, s, ptralign)) - return false; - - if (bed->want_got_plt) - { - s = bfd_make_section (abfd, ".got.plt"); - if (s == NULL - || !bfd_set_section_flags (abfd, s, flags) - || !bfd_set_section_alignment (abfd, s, ptralign)) - return false; - } - - /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got - (or .got.plt) section. We don't do this in the linker script - because we don't want to define the symbol if we are not creating - a global offset table. */ - h = NULL; - if (!(_bfd_generic_link_add_one_symbol - (info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s, - bed->got_symbol_offset, (const char *) NULL, false, - bed->collect, (struct bfd_link_hash_entry **) &h))) - return false; - h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; - h->type = STT_OBJECT; - - if (info->shared - && ! _bfd_elf_link_record_dynamic_symbol (info, h)) - return false; - - elf_hash_table (info)->hgot = h; - - /* The first bit of the global offset table is the header. */ - s->_raw_size += bed->got_header_size + bed->got_symbol_offset; - - return true; -} - - -/* Create dynamic sections when linking against a dynamic object. */ - -boolean -_bfd_elf_create_dynamic_sections (abfd, info) - bfd *abfd; - struct bfd_link_info *info; -{ - flagword flags, pltflags; - register asection *s; - struct elf_backend_data *bed = get_elf_backend_data (abfd); - int ptralign; - - switch (bed->s->arch_size) - { - case 32: ptralign = 2; break; - case 64: ptralign = 3; break; - default: abort(); - } - - /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and - .rel[a].bss sections. */ - - flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY - | SEC_LINKER_CREATED); - - pltflags = flags; - pltflags |= SEC_CODE; - if (bed->plt_not_loaded) - pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS); - if (bed->plt_readonly) - pltflags |= SEC_READONLY; - - s = bfd_make_section (abfd, ".plt"); - if (s == NULL - || ! bfd_set_section_flags (abfd, s, pltflags) - || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) - return false; - - if (bed->want_plt_sym) - { - /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the - .plt section. */ - struct elf_link_hash_entry *h = NULL; - if (! (_bfd_generic_link_add_one_symbol - (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, - (bfd_vma) 0, (const char *) NULL, false, - get_elf_backend_data (abfd)->collect, - (struct bfd_link_hash_entry **) &h))) - return false; - h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; - h->type = STT_OBJECT; - - if (info->shared - && ! _bfd_elf_link_record_dynamic_symbol (info, h)) - return false; - } - - s = bfd_make_section (abfd, - bed->default_use_rela_p ? ".rela.plt" : ".rel.plt"); - if (s == NULL - || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) - || ! bfd_set_section_alignment (abfd, s, ptralign)) - return false; - - if (! _bfd_elf_create_got_section (abfd, info)) - return false; - - /* The .dynbss section is a place to put symbols which are defined - by dynamic objects, are referenced by regular objects, and are - not functions. We must allocate space for them in the process - image and use a R_*_COPY reloc to tell the dynamic linker to - initialize them at run time. The linker script puts the .dynbss - section into the .bss section of the final image. */ - s = bfd_make_section (abfd, ".dynbss"); - if (s == NULL - || ! bfd_set_section_flags (abfd, s, SEC_ALLOC)) - return false; - - /* The .rel[a].bss section holds copy relocs. This section is not - normally needed. We need to create it here, though, so that the - linker will map it to an output section. We can't just create it - only if we need it, because we will not know whether we need it - until we have seen all the input files, and the first time the - main linker code calls BFD after examining all the input files - (size_dynamic_sections) the input sections have already been - mapped to the output sections. If the section turns out not to - be needed, we can discard it later. We will never need this - section when generating a shared object, since they do not use - copy relocs. */ - if (! info->shared) - { - s = bfd_make_section (abfd, - (bed->default_use_rela_p - ? ".rela.bss" : ".rel.bss")); - if (s == NULL - || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) - || ! bfd_set_section_alignment (abfd, s, ptralign)) - return false; - } - - return true; -} - - -/* Record a new dynamic symbol. We record the dynamic symbols as we - read the input files, since we need to have a list of all of them - before we can determine the final sizes of the output sections. - Note that we may actually call this function even though we are not - going to output any dynamic symbols; in some cases we know that a - symbol should be in the dynamic symbol table, but only if there is - one. */ - -boolean -_bfd_elf_link_record_dynamic_symbol (info, h) - struct bfd_link_info *info; - struct elf_link_hash_entry *h; -{ - if (h->dynindx == -1) - { - struct bfd_strtab_hash *dynstr; - char *p, *alc; - const char *name; - boolean copy; - bfd_size_type indx; - - h->dynindx = elf_hash_table (info)->dynsymcount; - ++elf_hash_table (info)->dynsymcount; - - dynstr = elf_hash_table (info)->dynstr; - if (dynstr == NULL) - { - /* Create a strtab to hold the dynamic symbol names. */ - elf_hash_table (info)->dynstr = dynstr = _bfd_elf_stringtab_init (); - if (dynstr == NULL) - return false; - } - - /* We don't put any version information in the dynamic string - table. */ - name = h->root.root.string; - p = strchr (name, ELF_VER_CHR); - if (p == NULL) - { - alc = NULL; - copy = false; - } - else - { - alc = bfd_malloc (p - name + 1); - if (alc == NULL) - return false; - strncpy (alc, name, p - name); - alc[p - name] = '\0'; - name = alc; - copy = true; - } - - indx = _bfd_stringtab_add (dynstr, name, true, copy); - - if (alc != NULL) - free (alc); - - if (indx == (bfd_size_type) -1) - return false; - h->dynstr_index = indx; - } - - return true; -} - -/* Create a special linker section, or return a pointer to a linker section already created */ - -elf_linker_section_t * -_bfd_elf_create_linker_section (abfd, info, which, defaults) - bfd *abfd; - struct bfd_link_info *info; - enum elf_linker_section_enum which; - elf_linker_section_t *defaults; -{ - bfd *dynobj = elf_hash_table (info)->dynobj; - elf_linker_section_t *lsect; - - /* Record the first bfd section that needs the special section */ - if (!dynobj) - dynobj = elf_hash_table (info)->dynobj = abfd; - - /* If this is the first time, create the section */ - lsect = elf_linker_section (dynobj, which); - if (!lsect) - { - asection *s; - - lsect = (elf_linker_section_t *) - bfd_alloc (dynobj, sizeof (elf_linker_section_t)); - - *lsect = *defaults; - elf_linker_section (dynobj, which) = lsect; - lsect->which = which; - lsect->hole_written_p = false; - - /* See if the sections already exist */ - lsect->section = s = bfd_get_section_by_name (dynobj, lsect->name); - if (!s || (s->flags & defaults->flags) != defaults->flags) - { - lsect->section = s = bfd_make_section_anyway (dynobj, lsect->name); - - if (s == NULL) - return (elf_linker_section_t *)0; - - bfd_set_section_flags (dynobj, s, defaults->flags); - bfd_set_section_alignment (dynobj, s, lsect->alignment); - } - else if (bfd_get_section_alignment (dynobj, s) < lsect->alignment) - bfd_set_section_alignment (dynobj, s, lsect->alignment); - - s->_raw_size = align_power (s->_raw_size, lsect->alignment); - - /* Is there a hole we have to provide? If so check whether the segment is - too big already */ - if (lsect->hole_size) - { - lsect->hole_offset = s->_raw_size; - s->_raw_size += lsect->hole_size; - if (lsect->hole_offset > lsect->max_hole_offset) - { - (*_bfd_error_handler) (_("%s: Section %s is already to large to put hole of %ld bytes in"), - bfd_get_filename (abfd), - lsect->name, - (long)lsect->hole_size); - - bfd_set_error (bfd_error_bad_value); - return (elf_linker_section_t *)0; - } - } - -#ifdef DEBUG - fprintf (stderr, "Creating section %s, current size = %ld\n", - lsect->name, (long)s->_raw_size); -#endif - - if (lsect->sym_name) - { - struct elf_link_hash_entry *h = NULL; -#ifdef DEBUG - fprintf (stderr, "Adding %s to section %s\n", - lsect->sym_name, - lsect->name); -#endif - h = (struct elf_link_hash_entry *) - bfd_link_hash_lookup (info->hash, lsect->sym_name, false, false, false); - - if ((h == NULL || h->root.type == bfd_link_hash_undefined) - && !(_bfd_generic_link_add_one_symbol (info, - abfd, - lsect->sym_name, - BSF_GLOBAL, - s, - ((lsect->hole_size) - ? s->_raw_size - lsect->hole_size + lsect->sym_offset - : lsect->sym_offset), - (const char *) NULL, - false, - get_elf_backend_data (abfd)->collect, - (struct bfd_link_hash_entry **) &h))) - return (elf_linker_section_t *)0; - - if ((defaults->which != LINKER_SECTION_SDATA) - && (defaults->which != LINKER_SECTION_SDATA2)) - h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_DYNAMIC; - - h->type = STT_OBJECT; - lsect->sym_hash = h; - - if (info->shared - && ! _bfd_elf_link_record_dynamic_symbol (info, h)) - return (elf_linker_section_t *)0; - } - } - -#if 0 - /* This does not make sense. The sections which may exist in the - object file have nothing to do with the sections we want to - create. */ - - /* Find the related sections if they have been created */ - if (lsect->bss_name && !lsect->bss_section) - lsect->bss_section = bfd_get_section_by_name (dynobj, lsect->bss_name); - - if (lsect->rel_name && !lsect->rel_section) - lsect->rel_section = bfd_get_section_by_name (dynobj, lsect->rel_name); -#endif - - return lsect; -} - - -/* Find a linker generated pointer with a given addend and type. */ - -elf_linker_section_pointers_t * -_bfd_elf_find_pointer_linker_section (linker_pointers, addend, which) - elf_linker_section_pointers_t *linker_pointers; - bfd_signed_vma addend; - elf_linker_section_enum_t which; -{ - for ( ; linker_pointers != NULL; linker_pointers = linker_pointers->next) - { - if (which == linker_pointers->which && addend == linker_pointers->addend) - return linker_pointers; - } - - return (elf_linker_section_pointers_t *)0; -} - - -/* Make the .rela section corresponding to the generated linker section. */ - -boolean -_bfd_elf_make_linker_section_rela (dynobj, lsect, alignment) - bfd *dynobj; - elf_linker_section_t *lsect; - int alignment; -{ - if (lsect->rel_section) - return true; - - lsect->rel_section = bfd_get_section_by_name (dynobj, lsect->rel_name); - if (lsect->rel_section == NULL) - { - lsect->rel_section = bfd_make_section (dynobj, lsect->rel_name); - if (lsect->rel_section == NULL - || ! bfd_set_section_flags (dynobj, - lsect->rel_section, - (SEC_ALLOC - | SEC_LOAD - | SEC_HAS_CONTENTS - | SEC_IN_MEMORY - | SEC_LINKER_CREATED - | SEC_READONLY)) - || ! bfd_set_section_alignment (dynobj, lsect->rel_section, alignment)) - return false; - } - - return true; -} |