# This shell script emits a C file. -*- C -*-
#   Copyright (C) 2009-2025 Free Software Foundation, Inc.
#   Contributed by Kalray Inc.
#
# This file is part of the GNU Binutils.
#
# 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 3 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; see the file COPYING3. If not,
# see <http://www.gnu.org/licenses/>.
#

# This file is sourced from elf32.em, and defines extra kvx-elf
# specific routines.
#
fragment <<EOF

#include "ldctor.h"
#include "elf/kvx.h"
#include "elfxx-kvx.h"


static void
elf${ELFSIZE}_kvx_before_allocation (void)
{
EOF
if test x"${EMULATION_NAME}" != x"elf64kvx_linux"; then
fragment <<EOF
 if (bfd_link_pie (&link_info))
   fatal (_(":%P: -pie not supported\n"));
EOF
fi
fragment <<EOF

 /* Call the standard elf routine.  */
 gld${EMULATION_NAME}_before_allocation ();
}



/* Fake input file for stubs.  */
static lang_input_statement_type *stub_file;

/* Whether we need to call gldarm_layout_sections_again.  */
static int need_laying_out = 0;

/* Maximum size of a group of input sections that can be handled by
  one stub section.  A value of +/-1 indicates the bfd back-end
  should use a suitable default size.  */
static bfd_signed_vma group_size = -1;

struct hook_stub_info
{
 lang_statement_list_type add;
 asection *input_section;
};

/* Traverse the linker tree to find the spot where the stub goes.  */

static bool
hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
{
 lang_statement_union_type *l;
 bool ret;

 for (; (l = *lp) != NULL; lp = &l->header.next)
   {
     switch (l->header.type)
       {
       case lang_constructors_statement_enum:
         ret = hook_in_stub (info, &constructor_list.head);
         if (ret)
           return ret;
         break;

       case lang_output_section_statement_enum:
         ret = hook_in_stub (info,
                 &l->output_section_statement.children.head);

         if (ret)
           return ret;
         break;

       case lang_wild_statement_enum:
         ret = hook_in_stub (info, &l->wild_statement.children.head);
         if (ret)
           return ret;
         break;

       case lang_group_statement_enum:
         ret = hook_in_stub (info, &l->group_statement.children.head);
         if (ret)
           return ret;
         break;

       case lang_input_section_enum:
         if (l->input_section.section == info->input_section)
           {
             /* We've found our section.  Insert the stub immediately
                after its associated input section.  */
             *(info->add.tail) = l->header.next;
             l->header.next = info->add.head;
             return true;
           }

         break;

       case lang_data_statement_enum:
       case lang_reloc_statement_enum:
       case lang_object_symbols_statement_enum:
       case lang_output_statement_enum:
       case lang_target_statement_enum:
       case lang_input_statement_enum:
       case lang_assignment_statement_enum:
       case lang_padding_statement_enum:
       case lang_address_statement_enum:
       case lang_fill_statement_enum:
         break;

       default:
         FAIL ();
         break;
       }
   }
 return false;
}


/* Call-back for elf${ELFSIZE}_kvx_size_stubs.  */

/* Create a new stub section, and arrange for it to be linked
  immediately after INPUT_SECTION.  */

static asection *
elf${ELFSIZE}_kvx_add_stub_section (const char *stub_sec_name,
                                   asection *input_section)
{
 asection *stub_sec;
 flagword flags;
 asection *output_section;
 lang_output_section_statement_type *os;
 struct hook_stub_info info;

 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
          | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
                                                stub_sec_name, flags);
 if (stub_sec == NULL)
   goto err_ret;

 bfd_set_section_alignment (stub_sec, 2);

 output_section = input_section->output_section;
 os = lang_output_section_get (output_section);

 info.input_section = input_section;
 lang_list_init (&info.add);
 lang_add_section (&info.add, stub_sec, NULL, NULL, os);

 if (info.add.head == NULL)
   goto err_ret;

 if (hook_in_stub (&info, &os->children.head))
   return stub_sec;

err_ret:
 einfo (_("%X%P: can not make stub section: %E\n"));
 return NULL;
}

/* Another call-back for elf${ELFSIZE}_kvx_size_stubs.  */

static void
gldkvx_layout_sections_again (void)
{
 /* If we have changed sizes of the stub sections, then we need
    to recalculate all the section offsets.  This may mean we need to
    add even more stubs.  */
 ldelf_map_segments (true);
 need_laying_out = -1;
}

static void
build_section_lists (lang_statement_union_type *statement)
{
 if (statement->header.type == lang_input_section_enum)
   {
     asection *i = statement->input_section.section;

     if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
         && (i->flags & SEC_EXCLUDE) == 0
         && i->output_section != NULL
         && i->output_section->owner == link_info.output_bfd)
       elf${ELFSIZE}_kvx_next_input_section (& link_info, i);
   }
}

static void
gld${EMULATION_NAME}_after_allocation (void)
{
 int ret;

 /* bfd_elf32_discard_info just plays with debugging sections,
    ie. doesn't affect any code, so we can delay resizing the
    sections.  It's likely we'll resize everything in the process of
    adding stubs.  */
 ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
 if (ret < 0)
   {
     einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
     return;
   }
 else if (ret > 0)
   need_laying_out = 1;

 /* If generating a relocatable output file, then we don't
    have to examine the relocs.  */
 if (stub_file != NULL && !bfd_link_relocatable (&link_info))
   {
     ret = elf${ELFSIZE}_kvx_setup_section_lists (link_info.output_bfd,
                                                      &link_info);
     if (ret != 0)
       {
         if (ret < 0)
           {
             einfo (_("%X%P: could not compute sections lists for stub generation: %E\n"));
             return;
           }

         lang_for_each_statement (build_section_lists);

         /* Call into the BFD backend to do the real work.  */
         if (! elf${ELFSIZE}_kvx_size_stubs (link_info.output_bfd,
                                         stub_file->the_bfd,
                                         & link_info,
                                         group_size,
                                         & elf${ELFSIZE}_kvx_add_stub_section,
                                         & gldkvx_layout_sections_again))
           {
             einfo (_("%X%P: cannot size stub section: %E\n"));
             return;
           }
       }
   }

 if (need_laying_out != -1)
   ldelf_map_segments (need_laying_out);
}

static void
gld${EMULATION_NAME}_finish (void)
{
 if (!bfd_link_relocatable (&link_info))
   {
     /* Now build the linker stubs.  */
     if (stub_file != NULL
         && stub_file->the_bfd->sections != NULL)
       {
         if (! elf${ELFSIZE}_kvx_build_stubs (& link_info))
           einfo (_("%X%P: can not build stubs: %E\n"));
       }
   }

 finish_default ();
}

/* This is a convenient point to tell BFD about target specific flags.
  After the output has been created, but before inputs are read.  */
static void
kvx_elf_create_output_section_statements (void)
{
 if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
       && elf_object_id (link_info.output_bfd) == KVX_ELF_DATA))
   return;

 stub_file = lang_add_input_file ("linker stubs",
                                  lang_input_file_is_fake_enum,
                                  NULL);
 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
 if (stub_file->the_bfd == NULL
     || ! bfd_set_arch_mach (stub_file->the_bfd,
                             bfd_get_arch (link_info.output_bfd),
                             bfd_get_mach (link_info.output_bfd)))
   {
     fatal (_("%P: can not create BFD %E\n"));
     return;
   }

 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
 ldlang_add_file (stub_file);

 if (!kvx_elf${ELFSIZE}_init_stub_bfd (&link_info, stub_file->the_bfd))
   fatal (_("%P: can not init BFD: %E\n"));
}


#define lang_for_each_input_file kvx_lang_for_each_input_file

EOF

LDEMUL_BEFORE_ALLOCATION=elf${ELFSIZE}_kvx_before_allocation
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=kvx_elf_create_output_section_statements

# Call the extra arm-elf function
LDEMUL_FINISH=gld${EMULATION_NAME}_finish

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.