1164 lines
32 KiB
Plaintext
1164 lines
32 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# It does some substitutions.
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# This file is now misnamed, because it supports both 32 bit and 64 bit
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# ELF emulations.
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test -z "${ELFSIZE}" && ELFSIZE=32
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cat >e${EMULATION_NAME}.c <<EOF
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/* This file is is generated by a shell script. DO NOT EDIT! */
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/* ${ELFSIZE} bit ELF emulation code for ${EMULATION_NAME}
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Copyright (C) 1991, 93, 94, 95, 96, 97, 1998 Free Software Foundation, Inc.
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Written by Steve Chamberlain <sac@cygnus.com>
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ELF support by Ian Lance Taylor <ian@cygnus.com>
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This file is part of GLD, the Gnu Linker.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define TARGET_IS_${EMULATION_NAME}
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#include "bfd.h"
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#include "sysdep.h"
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#include <ctype.h>
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#include "bfdlink.h"
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#include "ld.h"
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#include "ldmain.h"
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#include "ldemul.h"
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#include "ldfile.h"
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#include "ldmisc.h"
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#include "ldexp.h"
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#include "ldlang.h"
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#include "ldgram.h"
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static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
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static boolean gld${EMULATION_NAME}_open_dynamic_archive
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PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *));
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static void gld${EMULATION_NAME}_after_open PARAMS ((void));
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static void gld${EMULATION_NAME}_check_needed
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PARAMS ((lang_input_statement_type *));
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static void gld${EMULATION_NAME}_stat_needed
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PARAMS ((lang_input_statement_type *));
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static boolean gld${EMULATION_NAME}_search_needed
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PARAMS ((const char *, const char *, int));
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static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *, int));
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static void gld${EMULATION_NAME}_vercheck
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PARAMS ((lang_input_statement_type *));
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static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
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static void gld${EMULATION_NAME}_find_statement_assignment
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PARAMS ((lang_statement_union_type *));
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static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
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static boolean gld${EMULATION_NAME}_place_orphan
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PARAMS ((lang_input_statement_type *, asection *));
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static void gld${EMULATION_NAME}_place_section
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PARAMS ((lang_statement_union_type *));
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static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
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static void
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gld${EMULATION_NAME}_before_parse()
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{
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ldfile_output_architecture = bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`;
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config.dynamic_link = ${DYNAMIC_LINK-true};
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}
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/* Try to open a dynamic archive. This is where we know that ELF
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dynamic libraries have an extension of .so. */
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static boolean
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gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry)
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const char *arch;
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search_dirs_type *search;
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lang_input_statement_type *entry;
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{
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const char *filename;
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char *string;
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if (! entry->is_archive)
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return false;
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filename = entry->filename;
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string = (char *) xmalloc (strlen (search->name)
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+ strlen (filename)
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+ strlen (arch)
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+ sizeof "/lib.so");
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sprintf (string, "%s/lib%s%s.so", search->name, filename, arch);
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if (! ldfile_try_open_bfd (string, entry))
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{
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free (string);
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return false;
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}
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entry->filename = string;
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/* We have found a dynamic object to include in the link. The ELF
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backend linker will create a DT_NEEDED entry in the .dynamic
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section naming this file. If this file includes a DT_SONAME
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entry, it will be used. Otherwise, the ELF linker will just use
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the name of the file. For an archive found by searching, like
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this one, the DT_NEEDED entry should consist of just the name of
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the file, without the path information used to find it. Note
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that we only need to do this if we have a dynamic object; an
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archive will never be referenced by a DT_NEEDED entry.
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FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
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very pretty. I haven't been able to think of anything that is
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pretty, though. */
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if (bfd_check_format (entry->the_bfd, bfd_object)
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&& (entry->the_bfd->flags & DYNAMIC) != 0)
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{
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char *needed_name;
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ASSERT (entry->is_archive && entry->search_dirs_flag);
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needed_name = (char *) xmalloc (strlen (filename)
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+ strlen (arch)
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+ sizeof "lib.so");
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sprintf (needed_name, "lib%s%s.so", filename, arch);
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bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name);
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}
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return true;
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}
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EOF
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if [ "x${host}" = "x${target}" ] ; then
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if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
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cat >>e${EMULATION_NAME}.c <<EOF
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/* For a native linker, check the file /etc/ld.so.conf for directories
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in which we may find shared libraries. /etc/ld.so.conf is really
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only meaningful on Linux, but we check it on other systems anyhow. */
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static boolean gld${EMULATION_NAME}_check_ld_so_conf
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PARAMS ((const char *, int));
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static boolean
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gld${EMULATION_NAME}_check_ld_so_conf (name, force)
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const char *name;
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int force;
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{
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static boolean initialized;
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static char *ld_so_conf;
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if (! initialized)
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{
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FILE *f;
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f = fopen ("/etc/ld.so.conf", FOPEN_RT);
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if (f != NULL)
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{
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char *b;
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size_t len, alloc;
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int c;
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len = 0;
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alloc = 100;
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b = (char *) xmalloc (alloc);
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while ((c = getc (f)) != EOF)
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{
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if (len + 1 >= alloc)
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{
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alloc *= 2;
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b = (char *) xrealloc (b, alloc);
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}
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if (c != ':'
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&& c != ' '
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&& c != '\t'
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&& c != '\n'
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&& c != ',')
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{
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b[len] = c;
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++len;
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}
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else
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{
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if (len > 0 && b[len - 1] != ':')
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{
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b[len] = ':';
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++len;
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}
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}
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}
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if (len > 0 && b[len - 1] == ':')
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--len;
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if (len > 0)
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b[len] = '\0';
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else
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{
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free (b);
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b = NULL;
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}
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fclose (f);
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ld_so_conf = b;
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}
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initialized = true;
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}
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if (ld_so_conf == NULL)
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return false;
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return gld${EMULATION_NAME}_search_needed (ld_so_conf, name, force);
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}
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EOF
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fi
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fi
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cat >>e${EMULATION_NAME}.c <<EOF
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/* These variables are required to pass information back and forth
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between after_open and check_needed and stat_needed and vercheck. */
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static struct bfd_link_needed_list *global_needed;
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static struct stat global_stat;
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static boolean global_found;
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static struct bfd_link_needed_list *global_vercheck_needed;
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static boolean global_vercheck_failed;
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/* This is called after all the input files have been opened. */
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static void
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gld${EMULATION_NAME}_after_open ()
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{
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struct bfd_link_needed_list *needed, *l;
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/* We only need to worry about this when doing a final link. */
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if (link_info.relocateable || link_info.shared)
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return;
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/* Get the list of files which appear in DT_NEEDED entries in
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dynamic objects included in the link (often there will be none).
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For each such file, we want to track down the corresponding
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library, and include the symbol table in the link. This is what
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the runtime dynamic linker will do. Tracking the files down here
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permits one dynamic object to include another without requiring
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special action by the person doing the link. Note that the
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needed list can actually grow while we are stepping through this
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loop. */
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needed = bfd_elf_get_needed_list (output_bfd, &link_info);
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for (l = needed; l != NULL; l = l->next)
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{
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struct bfd_link_needed_list *ll;
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int force;
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/* If we've already seen this file, skip it. */
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for (ll = needed; ll != l; ll = ll->next)
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if (strcmp (ll->name, l->name) == 0)
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break;
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if (ll != l)
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continue;
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/* See if this file was included in the link explicitly. */
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global_needed = l;
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global_found = false;
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lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
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if (global_found)
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continue;
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/* We need to find this file and include the symbol table. We
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want to search for the file in the same way that the dynamic
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linker will search. That means that we want to use
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rpath_link, rpath, then the environment variable
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LD_LIBRARY_PATH (native only), then the linker script
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LIB_SEARCH_DIRS. We do not search using the -L arguments.
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We search twice. The first time, we skip objects which may
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introduce version mismatches. The second time, we force
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their use. See gld${EMULATION_NAME}_vercheck comment. */
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for (force = 0; force < 2; force++)
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{
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const char *lib_path;
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size_t len;
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search_dirs_type *search;
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if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
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l->name, force))
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break;
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if (gld${EMULATION_NAME}_search_needed (command_line.rpath,
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l->name, force))
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break;
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if (command_line.rpath_link == NULL
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&& command_line.rpath == NULL)
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{
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lib_path = (const char *) getenv ("LD_RUN_PATH");
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if (gld${EMULATION_NAME}_search_needed (lib_path, l->name,
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force))
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break;
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}
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EOF
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if [ "x${host}" = "x${target}" ] ; then
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if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
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cat >>e${EMULATION_NAME}.c <<EOF
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lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
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if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, force))
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break;
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EOF
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fi
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fi
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cat >>e${EMULATION_NAME}.c <<EOF
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len = strlen (l->name);
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for (search = search_head; search != NULL; search = search->next)
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{
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char *filename;
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if (search->cmdline)
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continue;
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filename = (char *) xmalloc (strlen (search->name) + len + 2);
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sprintf (filename, "%s/%s", search->name, l->name);
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if (gld${EMULATION_NAME}_try_needed (filename, force))
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break;
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free (filename);
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}
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if (search != NULL)
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break;
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EOF
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if [ "x${host}" = "x${target}" ] ; then
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if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
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cat >>e${EMULATION_NAME}.c <<EOF
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if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force))
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break;
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EOF
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fi
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fi
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cat >>e${EMULATION_NAME}.c <<EOF
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}
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if (force < 2)
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continue;
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einfo ("%P: warning: %s, needed by %B, not found (try using --rpath)\n",
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l->name, l->by);
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}
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}
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/* Search for a needed file in a path. */
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static boolean
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gld${EMULATION_NAME}_search_needed (path, name, force)
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const char *path;
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const char *name;
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int force;
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{
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const char *s;
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size_t len;
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if (path == NULL || *path == '\0')
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return false;
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len = strlen (name);
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while (1)
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{
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char *filename, *sset;
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s = strchr (path, ':');
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if (s == NULL)
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s = path + strlen (path);
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filename = (char *) xmalloc (s - path + len + 2);
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if (s == path)
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sset = filename;
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else
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{
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memcpy (filename, path, s - path);
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filename[s - path] = '/';
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sset = filename + (s - path) + 1;
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}
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strcpy (sset, name);
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if (gld${EMULATION_NAME}_try_needed (filename, force))
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return true;
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free (filename);
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if (*s == '\0')
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break;
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path = s + 1;
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}
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return false;
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}
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/* This function is called for each possible name for a dynamic object
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named by a DT_NEEDED entry. The FORCE parameter indicates whether
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to skip the check for a conflicting version. */
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static boolean
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gld${EMULATION_NAME}_try_needed (name, force)
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const char *name;
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int force;
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{
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bfd *abfd;
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abfd = bfd_openr (name, bfd_get_target (output_bfd));
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if (abfd == NULL)
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return false;
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if (! bfd_check_format (abfd, bfd_object))
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{
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(void) bfd_close (abfd);
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return false;
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}
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if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
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{
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(void) bfd_close (abfd);
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return false;
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}
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/* Check whether this object would include any conflicting library
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versions. If FORCE is set, then we skip this check; we use this
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the second time around, if we couldn't find any compatible
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instance of the shared library. */
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if (! force)
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{
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struct bfd_link_needed_list *needed;
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if (! bfd_elf_get_bfd_needed_list (abfd, &needed))
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einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd);
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if (needed != NULL)
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{
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global_vercheck_needed = needed;
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global_vercheck_failed = false;
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lang_for_each_input_file (gld${EMULATION_NAME}_vercheck);
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if (global_vercheck_failed)
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{
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(void) bfd_close (abfd);
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/* Return false to force the caller to move on to try
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another file on the search path. */
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return false;
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}
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|
/* But wait! It gets much worse. On Linux, if a shared
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|
library does not use libc at all, we are supposed to skip
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it the first time around in case we encounter a shared
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|
library later on with the same name which does use the
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|
version of libc that we want. This is much too horrible
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|
to use on any system other than Linux. */
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EOF
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case ${target} in
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*-*-linux-gnu*)
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cat >>e${EMULATION_NAME}.c <<EOF
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|
{
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struct bfd_link_needed_list *l;
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for (l = needed; l != NULL; l = l->next)
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if (strncmp (l->name, "libc.so", 7) == 0)
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break;
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|
if (l == NULL)
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|
{
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|
(void) bfd_close (abfd);
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return false;
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}
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|
}
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|
|
|
EOF
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|
;;
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esac
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|
cat >>e${EMULATION_NAME}.c <<EOF
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|
}
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|
}
|
|
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|
/* We've found a dynamic object matching the DT_NEEDED entry. */
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|
/* We have already checked that there is no other input file of the
|
|
same name. We must now check again that we are not including the
|
|
same file twice. We need to do this because on many systems
|
|
libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will
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|
reference libc.so.1. If we have already included libc.so, we
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|
don't want to include libc.so.1 if they are the same file, and we
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|
can only check that using stat. */
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if (bfd_stat (abfd, &global_stat) != 0)
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einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd);
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global_found = false;
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lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed);
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|
if (global_found)
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|
{
|
|
/* Return true to indicate that we found the file, even though
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|
we aren't going to do anything with it. */
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return true;
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|
}
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|
|
|
/* Tell the ELF backend that don't want the output file to have a
|
|
DT_NEEDED entry for this file. */
|
|
bfd_elf_set_dt_needed_name (abfd, "");
|
|
|
|
/* Add this file into the symbol table. */
|
|
if (! bfd_link_add_symbols (abfd, &link_info))
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|
einfo ("%F%B: could not read symbols: %E\n", abfd);
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|
|
return true;
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|
}
|
|
|
|
/* See if an input file matches a DT_NEEDED entry by name. */
|
|
|
|
static void
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|
gld${EMULATION_NAME}_check_needed (s)
|
|
lang_input_statement_type *s;
|
|
{
|
|
if (global_found)
|
|
return;
|
|
|
|
if (s->filename != NULL
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|
&& strcmp (s->filename, global_needed->name) == 0)
|
|
{
|
|
global_found = true;
|
|
return;
|
|
}
|
|
|
|
if (s->the_bfd != NULL)
|
|
{
|
|
const char *soname;
|
|
|
|
soname = bfd_elf_get_dt_soname (s->the_bfd);
|
|
if (soname != NULL
|
|
&& strcmp (soname, global_needed->name) == 0)
|
|
{
|
|
global_found = true;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (s->search_dirs_flag
|
|
&& s->filename != NULL
|
|
&& strchr (global_needed->name, '/') == NULL)
|
|
{
|
|
const char *f;
|
|
|
|
f = strrchr (s->filename, '/');
|
|
if (f != NULL
|
|
&& strcmp (f + 1, global_needed->name) == 0)
|
|
{
|
|
global_found = true;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* See if an input file matches a DT_NEEDED entry by running stat on
|
|
the file. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_stat_needed (s)
|
|
lang_input_statement_type *s;
|
|
{
|
|
struct stat st;
|
|
const char *suffix;
|
|
const char *soname;
|
|
const char *f;
|
|
|
|
if (global_found)
|
|
return;
|
|
if (s->the_bfd == NULL)
|
|
return;
|
|
|
|
if (bfd_stat (s->the_bfd, &st) != 0)
|
|
{
|
|
einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd);
|
|
return;
|
|
}
|
|
|
|
if (st.st_dev == global_stat.st_dev
|
|
&& st.st_ino == global_stat.st_ino)
|
|
{
|
|
global_found = true;
|
|
return;
|
|
}
|
|
|
|
/* We issue a warning if it looks like we are including two
|
|
different versions of the same shared library. For example,
|
|
there may be a problem if -lc picks up libc.so.6 but some other
|
|
shared library has a DT_NEEDED entry of libc.so.5. This is a
|
|
hueristic test, and it will only work if the name looks like
|
|
NAME.so.VERSION. FIXME: Depending on file names is error-prone.
|
|
If we really want to issue warnings about mixing version numbers
|
|
of shared libraries, we need to find a better way. */
|
|
|
|
if (strchr (global_needed->name, '/') != NULL)
|
|
return;
|
|
suffix = strstr (global_needed->name, ".so.");
|
|
if (suffix == NULL)
|
|
return;
|
|
suffix += sizeof ".so." - 1;
|
|
|
|
soname = bfd_elf_get_dt_soname (s->the_bfd);
|
|
if (soname == NULL)
|
|
soname = s->filename;
|
|
|
|
f = strrchr (soname, '/');
|
|
if (f != NULL)
|
|
++f;
|
|
else
|
|
f = soname;
|
|
|
|
if (strncmp (f, global_needed->name, suffix - global_needed->name) == 0)
|
|
einfo ("%P: warning: %s, needed by %B, may conflict with %s\n",
|
|
global_needed->name, global_needed->by, f);
|
|
}
|
|
|
|
/* On Linux, it's possible to have different versions of the same
|
|
shared library linked against different versions of libc. The
|
|
dynamic linker somehow tags which libc version to use in
|
|
/etc/ld.so.cache, and, based on the libc that it sees in the
|
|
executable, chooses which version of the shared library to use.
|
|
|
|
We try to do a similar check here by checking whether this shared
|
|
library needs any other shared libraries which may conflict with
|
|
libraries we have already included in the link. If it does, we
|
|
skip it, and try to find another shared library farther on down the
|
|
link path.
|
|
|
|
This is called via lang_for_each_input_file.
|
|
GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object
|
|
which we ar checking. This sets GLOBAL_VERCHECK_FAILED if we find
|
|
a conflicting version. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_vercheck (s)
|
|
lang_input_statement_type *s;
|
|
{
|
|
const char *soname, *f;
|
|
struct bfd_link_needed_list *l;
|
|
|
|
if (global_vercheck_failed)
|
|
return;
|
|
if (s->the_bfd == NULL
|
|
|| (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0)
|
|
return;
|
|
|
|
soname = bfd_elf_get_dt_soname (s->the_bfd);
|
|
if (soname == NULL)
|
|
soname = bfd_get_filename (s->the_bfd);
|
|
|
|
f = strrchr (soname, '/');
|
|
if (f != NULL)
|
|
++f;
|
|
else
|
|
f = soname;
|
|
|
|
for (l = global_vercheck_needed; l != NULL; l = l->next)
|
|
{
|
|
const char *suffix;
|
|
|
|
if (strcmp (f, l->name) == 0)
|
|
{
|
|
/* Probably can't happen, but it's an easy check. */
|
|
continue;
|
|
}
|
|
|
|
if (strchr (l->name, '/') != NULL)
|
|
continue;
|
|
|
|
suffix = strstr (l->name, ".so.");
|
|
if (suffix == NULL)
|
|
continue;
|
|
|
|
suffix += sizeof ".so." - 1;
|
|
|
|
if (strncmp (f, l->name, suffix - l->name) == 0)
|
|
{
|
|
/* Here we know that S is a dynamic object FOO.SO.VER1, and
|
|
the object we are considering needs a dynamic object
|
|
FOO.SO.VER2, and VER1 and VER2 are different. This
|
|
appears to be a version mismatch, so we tell the caller
|
|
to try a different version of this library. */
|
|
global_vercheck_failed = true;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This is called after the sections have been attached to output
|
|
sections, but before any sizes or addresses have been set. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_before_allocation ()
|
|
{
|
|
const char *rpath;
|
|
asection *sinterp;
|
|
|
|
/* If we are going to make any variable assignments, we need to let
|
|
the ELF backend know about them in case the variables are
|
|
referred to by dynamic objects. */
|
|
lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
|
|
|
|
/* Let the ELF backend work out the sizes of any sections required
|
|
by dynamic linking. */
|
|
rpath = command_line.rpath;
|
|
if (rpath == NULL)
|
|
rpath = (const char *) getenv ("LD_RUN_PATH");
|
|
if (! (bfd_elf${ELFSIZE}_size_dynamic_sections
|
|
(output_bfd, command_line.soname, rpath,
|
|
command_line.export_dynamic, command_line.filter_shlib,
|
|
(const char * const *) command_line.auxiliary_filters,
|
|
&link_info, &sinterp, lang_elf_version_info)))
|
|
einfo ("%P%F: failed to set dynamic section sizes: %E\n");
|
|
|
|
/* Let the user override the dynamic linker we are using. */
|
|
if (command_line.interpreter != NULL
|
|
&& sinterp != NULL)
|
|
{
|
|
sinterp->contents = (bfd_byte *) command_line.interpreter;
|
|
sinterp->_raw_size = strlen (command_line.interpreter) + 1;
|
|
}
|
|
|
|
/* Look for any sections named .gnu.warning. As a GNU extensions,
|
|
we treat such sections as containing warning messages. We print
|
|
out the warning message, and then zero out the section size so
|
|
that it does not get copied into the output file. */
|
|
|
|
{
|
|
LANG_FOR_EACH_INPUT_STATEMENT (is)
|
|
{
|
|
asection *s;
|
|
bfd_size_type sz;
|
|
char *msg;
|
|
boolean ret;
|
|
|
|
if (is->just_syms_flag)
|
|
continue;
|
|
|
|
s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
|
|
if (s == NULL)
|
|
continue;
|
|
|
|
sz = bfd_section_size (is->the_bfd, s);
|
|
msg = xmalloc ((size_t) sz + 1);
|
|
if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz))
|
|
einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
|
|
is->the_bfd);
|
|
msg[sz] = '\0';
|
|
ret = link_info.callbacks->warning (&link_info, msg,
|
|
(const char *) NULL,
|
|
is->the_bfd, (asection *) NULL,
|
|
(bfd_vma) 0);
|
|
ASSERT (ret);
|
|
free (msg);
|
|
|
|
/* Clobber the section size, so that we don't waste copying the
|
|
warning into the output file. */
|
|
s->_raw_size = 0;
|
|
}
|
|
}
|
|
|
|
#if defined (TARGET_IS_elf32bmip) || defined (TARGET_IS_elf32lmip)
|
|
/* For MIPS ELF the .reginfo section requires special handling.
|
|
Each input section is 24 bytes, and the final output section must
|
|
also be 24 bytes. We handle this by clobbering all but the first
|
|
input section size to 0. The .reginfo section is handled
|
|
specially by the backend code anyhow. */
|
|
{
|
|
boolean found = false;
|
|
LANG_FOR_EACH_INPUT_STATEMENT (is)
|
|
{
|
|
asection *s;
|
|
|
|
if (is->just_syms_flag)
|
|
continue;
|
|
|
|
s = bfd_get_section_by_name (is->the_bfd, ".reginfo");
|
|
if (s == NULL)
|
|
continue;
|
|
|
|
if (! found)
|
|
{
|
|
found = true;
|
|
continue;
|
|
}
|
|
|
|
s->_raw_size = 0;
|
|
s->_cooked_size = 0;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* This is called by the before_allocation routine via
|
|
lang_for_each_statement. It locates any assignment statements, and
|
|
tells the ELF backend about them, in case they are assignments to
|
|
symbols which are referred to by dynamic objects. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_find_statement_assignment (s)
|
|
lang_statement_union_type *s;
|
|
{
|
|
if (s->header.type == lang_assignment_statement_enum)
|
|
gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
|
|
}
|
|
|
|
/* Look through an expression for an assignment statement. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp)
|
|
etree_type *exp;
|
|
{
|
|
struct bfd_link_hash_entry *h;
|
|
|
|
switch (exp->type.node_class)
|
|
{
|
|
case etree_provide:
|
|
h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst,
|
|
false, false, false);
|
|
if (h == NULL)
|
|
break;
|
|
|
|
/* We call record_link_assignment even if the symbol is defined.
|
|
This is because if it is defined by a dynamic object, we
|
|
actually want to use the value defined by the linker script,
|
|
not the value from the dynamic object (because we are setting
|
|
symbols like etext). If the symbol is defined by a regular
|
|
object, then, as it happens, calling record_link_assignment
|
|
will do no harm. */
|
|
|
|
/* Fall through. */
|
|
case etree_assign:
|
|
if (strcmp (exp->assign.dst, ".") != 0)
|
|
{
|
|
if (! (bfd_elf${ELFSIZE}_record_link_assignment
|
|
(output_bfd, &link_info, exp->assign.dst,
|
|
exp->type.node_class == etree_provide ? true : false)))
|
|
einfo ("%P%F: failed to record assignment to %s: %E\n",
|
|
exp->assign.dst);
|
|
}
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
|
|
break;
|
|
|
|
case etree_binary:
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
|
|
break;
|
|
|
|
case etree_trinary:
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
|
|
break;
|
|
|
|
case etree_unary:
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Place an orphan section. We use this to put random SHF_ALLOC
|
|
sections in the right segment. */
|
|
|
|
static asection *hold_section;
|
|
static lang_output_section_statement_type *hold_use;
|
|
static lang_output_section_statement_type *hold_text;
|
|
static lang_output_section_statement_type *hold_rodata;
|
|
static lang_output_section_statement_type *hold_data;
|
|
static lang_output_section_statement_type *hold_bss;
|
|
static lang_output_section_statement_type *hold_rel;
|
|
static lang_output_section_statement_type *hold_interp;
|
|
|
|
/*ARGSUSED*/
|
|
static boolean
|
|
gld${EMULATION_NAME}_place_orphan (file, s)
|
|
lang_input_statement_type *file;
|
|
asection *s;
|
|
{
|
|
lang_output_section_statement_type *place;
|
|
asection *snew, **pps;
|
|
lang_statement_list_type *old;
|
|
lang_statement_list_type add;
|
|
etree_type *address;
|
|
const char *secname, *ps;
|
|
const char *outsecname;
|
|
lang_output_section_statement_type *os;
|
|
|
|
if ((s->flags & SEC_ALLOC) == 0)
|
|
return false;
|
|
|
|
/* Look through the script to see where to place this section. */
|
|
hold_section = s;
|
|
hold_use = NULL;
|
|
lang_for_each_statement (gld${EMULATION_NAME}_place_section);
|
|
|
|
if (hold_use != NULL)
|
|
{
|
|
/* We have already placed a section with this name. */
|
|
wild_doit (&hold_use->children, s, hold_use, file);
|
|
return true;
|
|
}
|
|
|
|
secname = bfd_get_section_name (s->owner, s);
|
|
|
|
/* If this is a final link, then always put .gnu.warning.SYMBOL
|
|
sections into the .text section to get them out of the way. */
|
|
if (! link_info.shared
|
|
&& ! link_info.relocateable
|
|
&& strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0
|
|
&& hold_text != NULL)
|
|
{
|
|
wild_doit (&hold_text->children, s, hold_text, file);
|
|
return true;
|
|
}
|
|
|
|
/* Decide which segment the section should go in based on the
|
|
section name and section flags. We put loadable .note sections
|
|
right after the .interp section, so that the PT_NOTE segment is
|
|
stored right after the program headers where the OS can read it
|
|
in the first page. */
|
|
place = NULL;
|
|
if ((s->flags & SEC_LOAD) != 0
|
|
&& strncmp (secname, ".note", 4) == 0
|
|
&& hold_interp != NULL)
|
|
place = hold_interp;
|
|
else if ((s->flags & SEC_HAS_CONTENTS) == 0
|
|
&& hold_bss != NULL)
|
|
place = hold_bss;
|
|
else if ((s->flags & SEC_READONLY) == 0
|
|
&& hold_data != NULL)
|
|
place = hold_data;
|
|
else if (strncmp (secname, ".rel", 4) == 0
|
|
&& hold_rel != NULL)
|
|
place = hold_rel;
|
|
else if ((s->flags & SEC_CODE) == 0
|
|
&& (s->flags & SEC_READONLY) != 0
|
|
&& hold_rodata != NULL)
|
|
place = hold_rodata;
|
|
else if ((s->flags & SEC_READONLY) != 0
|
|
&& hold_text != NULL)
|
|
place = hold_text;
|
|
if (place == NULL)
|
|
return false;
|
|
|
|
/* Choose a unique name for the section. This will be needed if the
|
|
same section name appears in the input file with different
|
|
loadable or allocateable characteristics. */
|
|
outsecname = secname;
|
|
if (bfd_get_section_by_name (output_bfd, outsecname) != NULL)
|
|
{
|
|
unsigned int len;
|
|
char *newname;
|
|
unsigned int i;
|
|
|
|
len = strlen (outsecname);
|
|
newname = xmalloc (len + 5);
|
|
strcpy (newname, outsecname);
|
|
i = 0;
|
|
do
|
|
{
|
|
sprintf (newname + len, "%d", i);
|
|
++i;
|
|
}
|
|
while (bfd_get_section_by_name (output_bfd, newname) != NULL);
|
|
|
|
outsecname = newname;
|
|
}
|
|
|
|
/* Create the section in the output file, and put it in the right
|
|
place. This shuffling is to make the output file look neater. */
|
|
snew = bfd_make_section (output_bfd, outsecname);
|
|
if (snew == NULL)
|
|
einfo ("%P%F: output format %s cannot represent section called %s\n",
|
|
output_bfd->xvec->name, outsecname);
|
|
if (place->bfd_section != NULL)
|
|
{
|
|
for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
|
|
;
|
|
*pps = snew->next;
|
|
snew->next = place->bfd_section->next;
|
|
place->bfd_section->next = snew;
|
|
}
|
|
|
|
/* Start building a list of statements for this section. */
|
|
old = stat_ptr;
|
|
stat_ptr = &add;
|
|
lang_list_init (stat_ptr);
|
|
|
|
/* If the name of the section is representable in C, then create
|
|
symbols to mark the start and the end of the section. */
|
|
for (ps = outsecname; *ps != '\0'; ps++)
|
|
if (! isalnum ((unsigned char) *ps) && *ps != '_')
|
|
break;
|
|
if (*ps == '\0' && config.build_constructors)
|
|
{
|
|
char *symname;
|
|
|
|
symname = (char *) xmalloc (ps - outsecname + sizeof "__start_");
|
|
sprintf (symname, "__start_%s", outsecname);
|
|
lang_add_assignment (exp_assop ('=', symname,
|
|
exp_unop (ALIGN_K,
|
|
exp_intop ((bfd_vma) 1
|
|
<< s->alignment_power))));
|
|
}
|
|
|
|
if (! link_info.relocateable)
|
|
address = NULL;
|
|
else
|
|
address = exp_intop ((bfd_vma) 0);
|
|
|
|
lang_enter_output_section_statement (outsecname, address, 0,
|
|
(bfd_vma) 0,
|
|
(etree_type *) NULL,
|
|
(etree_type *) NULL,
|
|
(etree_type *) NULL);
|
|
|
|
os = lang_output_section_statement_lookup (outsecname);
|
|
wild_doit (&os->children, s, os, file);
|
|
|
|
lang_leave_output_section_statement
|
|
((bfd_vma) 0, "*default*", (struct lang_output_section_phdr_list *) NULL);
|
|
stat_ptr = &add;
|
|
|
|
if (*ps == '\0' && config.build_constructors)
|
|
{
|
|
char *symname;
|
|
|
|
symname = (char *) xmalloc (ps - outsecname + sizeof "__stop_");
|
|
sprintf (symname, "__stop_%s", outsecname);
|
|
lang_add_assignment (exp_assop ('=', symname,
|
|
exp_nameop (NAME, ".")));
|
|
}
|
|
|
|
/* Now stick the new statement list right after PLACE. */
|
|
*add.tail = place->header.next;
|
|
place->header.next = add.head;
|
|
|
|
stat_ptr = old;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_place_section (s)
|
|
lang_statement_union_type *s;
|
|
{
|
|
lang_output_section_statement_type *os;
|
|
|
|
if (s->header.type != lang_output_section_statement_enum)
|
|
return;
|
|
|
|
os = &s->output_section_statement;
|
|
|
|
if (strcmp (os->name, hold_section->name) == 0
|
|
&& os->bfd_section != NULL
|
|
&& ((hold_section->flags & (SEC_LOAD | SEC_ALLOC))
|
|
== (os->bfd_section->flags & (SEC_LOAD | SEC_ALLOC))))
|
|
hold_use = os;
|
|
|
|
if (strcmp (os->name, ".text") == 0)
|
|
hold_text = os;
|
|
else if (strcmp (os->name, ".rodata") == 0)
|
|
hold_rodata = os;
|
|
else if (strcmp (os->name, ".data") == 0)
|
|
hold_data = os;
|
|
else if (strcmp (os->name, ".bss") == 0)
|
|
hold_bss = os;
|
|
else if (hold_rel == NULL
|
|
&& os->bfd_section != NULL
|
|
&& (os->bfd_section->flags & SEC_ALLOC) != 0
|
|
&& strncmp (os->name, ".rel", 4) == 0)
|
|
hold_rel = os;
|
|
else if (strcmp (os->name, ".interp") == 0)
|
|
hold_interp = os;
|
|
}
|
|
|
|
static char *
|
|
gld${EMULATION_NAME}_get_script(isfile)
|
|
int *isfile;
|
|
EOF
|
|
|
|
if test -n "$COMPILE_IN"
|
|
then
|
|
# Scripts compiled in.
|
|
|
|
# sed commands to quote an ld script as a C string.
|
|
sc='s/["\\]/\\&/g
|
|
s/$/\\n\\/
|
|
1s/^/"/
|
|
$s/$/n"/
|
|
'
|
|
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
{
|
|
*isfile = 0;
|
|
|
|
if (link_info.relocateable == true && config.build_constructors == true)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
|
|
else if (link_info.relocateable == true)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
|
|
else if (!config.text_read_only)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
|
|
else if (!config.magic_demand_paged)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
|
|
else if (link_info.shared)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`;
|
|
else
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
|
|
}
|
|
EOF
|
|
|
|
else
|
|
# Scripts read from the filesystem.
|
|
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
{
|
|
*isfile = 1;
|
|
|
|
if (link_info.relocateable == true && config.build_constructors == true)
|
|
return "ldscripts/${EMULATION_NAME}.xu";
|
|
else if (link_info.relocateable == true)
|
|
return "ldscripts/${EMULATION_NAME}.xr";
|
|
else if (!config.text_read_only)
|
|
return "ldscripts/${EMULATION_NAME}.xbn";
|
|
else if (!config.magic_demand_paged)
|
|
return "ldscripts/${EMULATION_NAME}.xn";
|
|
else if (link_info.shared)
|
|
return "ldscripts/${EMULATION_NAME}.xs";
|
|
else
|
|
return "ldscripts/${EMULATION_NAME}.x";
|
|
}
|
|
EOF
|
|
|
|
fi
|
|
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
|
|
struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
|
|
{
|
|
gld${EMULATION_NAME}_before_parse,
|
|
syslib_default,
|
|
hll_default,
|
|
after_parse_default,
|
|
gld${EMULATION_NAME}_after_open,
|
|
after_allocation_default,
|
|
set_output_arch_default,
|
|
ldemul_default_target,
|
|
gld${EMULATION_NAME}_before_allocation,
|
|
gld${EMULATION_NAME}_get_script,
|
|
"${EMULATION_NAME}",
|
|
"${OUTPUT_FORMAT}",
|
|
NULL,
|
|
NULL,
|
|
gld${EMULATION_NAME}_open_dynamic_archive,
|
|
gld${EMULATION_NAME}_place_orphan
|
|
};
|
|
EOF
|