1324 lines
37 KiB
Text
1324 lines
37 KiB
Text
# This shell script emits a C file. -*- C -*-
|
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# It does some substitutions.
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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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/* emulate the original gld for the given ${EMULATION_NAME}
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Copyright (C) 1991, 93, 96, 97, 98, 1999 Free Software Foundation, Inc.
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Written by Steve Chamberlain steve@cygnus.com
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This file is part of GLD, the Gnu Linker.
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This program is free software; you can redistribute it and/or modify
|
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it under the terms of the GNU General Public License as published by
|
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the Free Software Foundation; either version 2 of the License, or
|
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(at your option) any later version.
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||
|
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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GNU General Public License for more details.
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||
|
||
You should have received a copy of the GNU General Public License
|
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define TARGET_IS_${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 "getopt.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 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}_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 lang_output_section_statement_type *output_rel_find PARAMS ((void));
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static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
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static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
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static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
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static int gld${EMULATION_NAME}_parse_args PARAMS((int, char **));
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static void gld${EMULATION_NAME}_list_options PARAMS ((FILE *));
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static void gld${EMULATION_NAME}_finish PARAMS ((void));
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static int no_pipeline_knowledge = 0;
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static char * thumb_entry_symbol = NULL;
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#define OPTION_THUMB_ENTRY 301
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static struct option longopts[] =
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{
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{ "no-pipeline-knowledge", no_argument, NULL, 'p'},
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{ "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
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{ NULL, no_argument, NULL, 0 }
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};
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static void
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gld${EMULATION_NAME}_list_options (file)
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FILE * file;
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{
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fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
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fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
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}
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static int
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gld${EMULATION_NAME}_parse_args (argc, argv)
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int argc;
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char ** argv;
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{
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int longind;
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int optc;
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int prevoptind = optind;
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int prevopterr = opterr;
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int wanterror;
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static int lastoptind = -1;
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if (lastoptind != optind)
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opterr = 0;
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wanterror = opterr;
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lastoptind = optind;
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optc = getopt_long_only (argc, argv, "-p", longopts, & longind);
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opterr = prevopterr;
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switch (optc)
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{
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default:
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if (wanterror)
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xexit (1);
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optind = prevoptind;
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return 0;
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case 'p':
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no_pipeline_knowledge = 1;
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break;
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case OPTION_THUMB_ENTRY:
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thumb_entry_symbol = optarg;
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break;
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}
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return 1;
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}
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static void
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gld${EMULATION_NAME}_before_parse ()
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{
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#ifndef TARGET_ /* I.e., if not generic. */
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ldfile_set_output_arch ("`echo ${ARCH}`");
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#endif /* not TARGET_ */
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config.dynamic_link = ${DYNAMIC_LINK-true};
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config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`;
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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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case " ${EMULATION_LIBPATH} " in
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*" ${EMULATION_NAME} "*)
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cat >>e${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${EMULATION_NAME}_search_needed (ld_so_conf, name, force);
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}
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EOF
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;;
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esac
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fi
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cat >>e${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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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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if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
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{
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/* The arm backend needs special fields in the output hash structure.
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These will only be created if the output format is an arm format,
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hence we do not support linking and changing output formats at the
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same time. Use a link followed by objcopy to change output formats. */
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einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
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return;
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}
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{
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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/* The interworking bfd must be the last one to be processed */
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if (!is->next)
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bfd_elf32_arm_get_bfd_for_interworking (is->the_bfd, & link_info);
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}
|
||
}
|
||
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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)
|
||
return;
|
||
|
||
/* 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).
|
||
For each such file, we want to track down the corresponding
|
||
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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|
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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
|
||
want to search for the file in the same way that the dynamic
|
||
linker will search. That means that we want to use
|
||
rpath_link, rpath, then the environment variable
|
||
LD_LIBRARY_PATH (native only), then the linker script
|
||
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
|
||
introduce version mismatches. The second time, we force
|
||
their use. See gld${EMULATION_NAME}_vercheck comment. */
|
||
for (force = 0; force < 2; force++)
|
||
{
|
||
const char *lib_path;
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size_t len;
|
||
search_dirs_type *search;
|
||
|
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if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
|
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l->name, force))
|
||
break;
|
||
if (gld${EMULATION_NAME}_search_needed (command_line.rpath,
|
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l->name, force))
|
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break;
|
||
if (command_line.rpath_link == NULL
|
||
&& command_line.rpath == NULL)
|
||
{
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lib_path = (const char *) getenv ("LD_RUN_PATH");
|
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if (gld${EMULATION_NAME}_search_needed (lib_path, l->name,
|
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force))
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break;
|
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}
|
||
EOF
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if [ "x${host}" = "x${target}" ] ; then
|
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case " ${EMULATION_LIBPATH} " in
|
||
*" ${EMULATION_NAME} "*)
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cat >>e${EMULATION_NAME}.c <<EOF
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lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
|
||
if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, force))
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break;
|
||
EOF
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||
;;
|
||
esac
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fi
|
||
cat >>e${EMULATION_NAME}.c <<EOF
|
||
len = strlen (l->name);
|
||
for (search = search_head; search != NULL; search = search->next)
|
||
{
|
||
char *filename;
|
||
|
||
if (search->cmdline)
|
||
continue;
|
||
filename = (char *) xmalloc (strlen (search->name) + len + 2);
|
||
sprintf (filename, "%s/%s", search->name, l->name);
|
||
if (gld${EMULATION_NAME}_try_needed (filename, force))
|
||
break;
|
||
free (filename);
|
||
}
|
||
if (search != NULL)
|
||
break;
|
||
EOF
|
||
if [ "x${host}" = "x${target}" ] ; then
|
||
case " ${EMULATION_LIBPATH} " in
|
||
*" ${EMULATION_NAME} "*)
|
||
cat >>e${EMULATION_NAME}.c <<EOF
|
||
if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force))
|
||
break;
|
||
EOF
|
||
;;
|
||
esac
|
||
fi
|
||
cat >>e${EMULATION_NAME}.c <<EOF
|
||
}
|
||
|
||
if (force < 2)
|
||
continue;
|
||
|
||
einfo ("%P: warning: %s, needed by %B, not found (try using --rpath)\n",
|
||
l->name, l->by);
|
||
}
|
||
}
|
||
|
||
/* Search for a needed file in a path. */
|
||
|
||
static boolean
|
||
gld${EMULATION_NAME}_search_needed (path, name, force)
|
||
const char *path;
|
||
const char *name;
|
||
int force;
|
||
{
|
||
const char *s;
|
||
size_t len;
|
||
|
||
if (path == NULL || *path == '\0')
|
||
return false;
|
||
len = strlen (name);
|
||
while (1)
|
||
{
|
||
char *filename, *sset;
|
||
|
||
s = strchr (path, ':');
|
||
if (s == NULL)
|
||
s = path + strlen (path);
|
||
|
||
filename = (char *) xmalloc (s - path + len + 2);
|
||
if (s == path)
|
||
sset = filename;
|
||
else
|
||
{
|
||
memcpy (filename, path, s - path);
|
||
filename[s - path] = '/';
|
||
sset = filename + (s - path) + 1;
|
||
}
|
||
strcpy (sset, name);
|
||
|
||
if (gld${EMULATION_NAME}_try_needed (filename, force))
|
||
return true;
|
||
|
||
free (filename);
|
||
|
||
if (*s == '\0')
|
||
break;
|
||
path = s + 1;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* This function is called for each possible name for a dynamic object
|
||
named by a DT_NEEDED entry. The FORCE parameter indicates whether
|
||
to skip the check for a conflicting version. */
|
||
|
||
static boolean
|
||
gld${EMULATION_NAME}_try_needed (name, force)
|
||
const char *name;
|
||
int force;
|
||
{
|
||
bfd *abfd;
|
||
|
||
abfd = bfd_openr (name, bfd_get_target (output_bfd));
|
||
if (abfd == NULL)
|
||
return false;
|
||
if (! bfd_check_format (abfd, bfd_object))
|
||
{
|
||
(void) bfd_close (abfd);
|
||
return false;
|
||
}
|
||
if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
|
||
{
|
||
(void) bfd_close (abfd);
|
||
return false;
|
||
}
|
||
|
||
/* Check whether this object would include any conflicting library
|
||
versions. If FORCE is set, then we skip this check; we use this
|
||
the second time around, if we couldn't find any compatible
|
||
instance of the shared library. */
|
||
|
||
if (! force)
|
||
{
|
||
struct bfd_link_needed_list *needed;
|
||
|
||
if (! bfd_elf_get_bfd_needed_list (abfd, &needed))
|
||
einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd);
|
||
|
||
if (needed != NULL)
|
||
{
|
||
global_vercheck_needed = needed;
|
||
global_vercheck_failed = false;
|
||
lang_for_each_input_file (gld${EMULATION_NAME}_vercheck);
|
||
if (global_vercheck_failed)
|
||
{
|
||
(void) bfd_close (abfd);
|
||
/* Return false to force the caller to move on to try
|
||
another file on the search path. */
|
||
return false;
|
||
}
|
||
|
||
/* But wait! It gets much worse. On Linux, if a shared
|
||
library does not use libc at all, we are supposed to skip
|
||
it the first time around in case we encounter a shared
|
||
library later on with the same name which does use the
|
||
version of libc that we want. This is much too horrible
|
||
to use on any system other than Linux. */
|
||
|
||
EOF
|
||
case ${target} in
|
||
*-*-linux-gnu*)
|
||
cat >>e${EMULATION_NAME}.c <<EOF
|
||
{
|
||
struct bfd_link_needed_list *l;
|
||
|
||
for (l = needed; l != NULL; l = l->next)
|
||
if (strncmp (l->name, "libc.so", 7) == 0)
|
||
break;
|
||
if (l == NULL)
|
||
{
|
||
(void) bfd_close (abfd);
|
||
return false;
|
||
}
|
||
}
|
||
|
||
EOF
|
||
;;
|
||
esac
|
||
cat >>e${EMULATION_NAME}.c <<EOF
|
||
}
|
||
}
|
||
|
||
/* We've found a dynamic object matching the DT_NEEDED entry. */
|
||
|
||
/* We have already checked that there is no other input file of the
|
||
same name. We must now check again that we are not including the
|
||
same file twice. We need to do this because on many systems
|
||
libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will
|
||
reference libc.so.1. If we have already included libc.so, we
|
||
don't want to include libc.so.1 if they are the same file, and we
|
||
can only check that using stat. */
|
||
|
||
if (bfd_stat (abfd, &global_stat) != 0)
|
||
einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd);
|
||
global_found = false;
|
||
lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed);
|
||
if (global_found)
|
||
{
|
||
/* Return true to indicate that we found the file, even though
|
||
we aren't going to do anything with it. */
|
||
return true;
|
||
}
|
||
|
||
/* 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))
|
||
einfo ("%F%B: could not read symbols: %E\n", abfd);
|
||
|
||
return true;
|
||
}
|
||
|
||
/* See if an input file matches a DT_NEEDED entry by name. */
|
||
|
||
static void
|
||
gld${EMULATION_NAME}_check_needed (s)
|
||
lang_input_statement_type *s;
|
||
{
|
||
if (global_found)
|
||
return;
|
||
|
||
if (s->filename != NULL
|
||
&& strcmp (s->filename, global_needed->name) == 0)
|
||
{
|
||
global_found = true;
|
||
return;
|
||
}
|
||
|
||
if (s->the_bfd != NULL)
|
||
{
|
||
const char *soname;
|
||
|
||
soname = bfd_elf_get_dt_soname (s->the_bfd);
|
||
if (soname != NULL
|
||
&& strcmp (soname, global_needed->name) == 0)
|
||
{
|
||
global_found = true;
|
||
return;
|
||
}
|
||
}
|
||
|
||
if (s->search_dirs_flag
|
||
&& s->filename != NULL
|
||
&& strchr (global_needed->name, '/') == NULL)
|
||
{
|
||
const char *f;
|
||
|
||
f = strrchr (s->filename, '/');
|
||
if (f != NULL
|
||
&& strcmp (f + 1, global_needed->name) == 0)
|
||
{
|
||
global_found = true;
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See if an input file matches a DT_NEEDED entry by running stat on
|
||
the file. */
|
||
|
||
static void
|
||
gld${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${EMULATION_NAME}_vercheck (s)
|
||
lang_input_statement_type *s;
|
||
{
|
||
const char *soname, *f;
|
||
struct bfd_link_needed_list *l;
|
||
|
||
if (global_vercheck_failed)
|
||
return;
|
||
if (s->the_bfd == NULL
|
||
|| (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0)
|
||
return;
|
||
|
||
soname = bfd_elf_get_dt_soname (s->the_bfd);
|
||
if (soname == NULL)
|
||
soname = bfd_get_filename (s->the_bfd);
|
||
|
||
f = strrchr (soname, '/');
|
||
if (f != NULL)
|
||
++f;
|
||
else
|
||
f = soname;
|
||
|
||
for (l = global_vercheck_needed; l != NULL; l = l->next)
|
||
{
|
||
const char *suffix;
|
||
|
||
if (strcmp (f, l->name) == 0)
|
||
{
|
||
/* Probably can't happen, but it's an easy check. */
|
||
continue;
|
||
}
|
||
|
||
if (strchr (l->name, '/') != NULL)
|
||
continue;
|
||
|
||
suffix = strstr (l->name, ".so.");
|
||
if (suffix == NULL)
|
||
continue;
|
||
|
||
suffix += sizeof ".so." - 1;
|
||
|
||
if (strncmp (f, l->name, suffix - l->name) == 0)
|
||
{
|
||
/* Here we know that S is a dynamic object FOO.SO.VER1, and
|
||
the object we are considering needs a dynamic object
|
||
FOO.SO.VER2, and VER1 and VER2 are different. This
|
||
appears to be a version mismatch, so we tell the caller
|
||
to try a different version of this library. */
|
||
global_vercheck_failed = true;
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Place an orphan section. We use this to put random SHF_ALLOC
|
||
sections in the right segment. */
|
||
|
||
struct orphan_save
|
||
{
|
||
lang_output_section_statement_type *os;
|
||
asection **section;
|
||
lang_statement_union_type **stmt;
|
||
};
|
||
|
||
/*ARGSUSED*/
|
||
static boolean
|
||
gld${EMULATION_NAME}_place_orphan (file, s)
|
||
lang_input_statement_type *file;
|
||
asection *s;
|
||
{
|
||
static struct orphan_save hold_text;
|
||
static struct orphan_save hold_rodata;
|
||
static struct orphan_save hold_data;
|
||
static struct orphan_save hold_bss;
|
||
static struct orphan_save hold_rel;
|
||
static struct orphan_save hold_interp;
|
||
struct orphan_save *place;
|
||
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;
|
||
|
||
secname = bfd_get_section_name (s->owner, s);
|
||
|
||
/* Look through the script to see where to place this section. */
|
||
os = lang_output_section_find (secname);
|
||
|
||
if (os != NULL
|
||
&& os->bfd_section != NULL
|
||
&& ((s->flags ^ os->bfd_section->flags) & (SEC_LOAD | SEC_ALLOC)) == 0)
|
||
{
|
||
/* We have already placed a section with this name. */
|
||
wild_doit (&os->children, s, os, file);
|
||
return true;
|
||
}
|
||
|
||
if (hold_text.os == NULL)
|
||
hold_text.os = lang_output_section_find (".text");
|
||
|
||
/* 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.os != NULL)
|
||
{
|
||
wild_doit (&hold_text.os->children, s, hold_text.os, 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. */
|
||
#define HAVE_SECTION(hold, name) \
|
||
(hold.os != NULL || (hold.os = lang_output_section_find (name)) != NULL)
|
||
|
||
if (s->flags & SEC_EXCLUDE)
|
||
return false;
|
||
else if ((s->flags & SEC_ALLOC) == 0)
|
||
place = NULL;
|
||
else if ((s->flags & SEC_LOAD) != 0
|
||
&& strncmp (secname, ".note", 4) == 0
|
||
&& HAVE_SECTION (hold_interp, ".interp"))
|
||
place = &hold_interp;
|
||
else if ((s->flags & SEC_HAS_CONTENTS) == 0
|
||
&& HAVE_SECTION (hold_bss, ".bss"))
|
||
place = &hold_bss;
|
||
else if ((s->flags & SEC_READONLY) == 0
|
||
&& HAVE_SECTION (hold_data, ".data"))
|
||
place = &hold_data;
|
||
else if (strncmp (secname, ".rel", 4) == 0
|
||
&& (hold_rel.os != NULL
|
||
|| (hold_rel.os = output_rel_find ()) != NULL))
|
||
place = &hold_rel;
|
||
else if ((s->flags & SEC_CODE) == 0
|
||
&& (s->flags & SEC_READONLY) != 0
|
||
&& HAVE_SECTION (hold_rodata, ".rodata"))
|
||
place = &hold_rodata;
|
||
else if ((s->flags & SEC_READONLY) != 0
|
||
&& hold_text.os != NULL)
|
||
place = &hold_text;
|
||
else
|
||
place = NULL;
|
||
|
||
#undef HAVE_SECTION
|
||
|
||
/* 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;
|
||
}
|
||
|
||
if (place != NULL)
|
||
{
|
||
/* 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;
|
||
etree_type *e_align;
|
||
|
||
symname = (char *) xmalloc (ps - outsecname + sizeof "__start_");
|
||
sprintf (symname, "__start_%s", outsecname);
|
||
e_align = exp_unop (ALIGN_K,
|
||
exp_intop ((bfd_vma) 1 << s->alignment_power));
|
||
lang_add_assignment (exp_assop ('=', symname, e_align));
|
||
}
|
||
}
|
||
|
||
if (link_info.relocateable || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0)
|
||
address = exp_intop ((bfd_vma) 0);
|
||
else
|
||
address = NULL;
|
||
|
||
os = lang_enter_output_section_statement (outsecname, address, 0,
|
||
(bfd_vma) 0,
|
||
(etree_type *) NULL,
|
||
(etree_type *) NULL,
|
||
(etree_type *) NULL);
|
||
|
||
wild_doit (&os->children, s, os, file);
|
||
|
||
lang_leave_output_section_statement
|
||
((bfd_vma) 0, "*default*",
|
||
(struct lang_output_section_phdr_list *) NULL, "*default*");
|
||
|
||
if (place != NULL)
|
||
{
|
||
asection *snew, **pps;
|
||
|
||
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, ".")));
|
||
}
|
||
stat_ptr = old;
|
||
|
||
snew = os->bfd_section;
|
||
if (place->os->bfd_section != NULL || place->section != NULL)
|
||
{
|
||
/* Shuffle the section to make the output file look neater. */
|
||
if (place->section == NULL)
|
||
{
|
||
#if 0
|
||
/* Finding the end of the list is a little tricky. We
|
||
make a wild stab at it by comparing section flags. */
|
||
flagword first_flags = place->os->bfd_section->flags;
|
||
for (pps = &place->os->bfd_section->next;
|
||
*pps != NULL && (*pps)->flags == first_flags;
|
||
pps = &(*pps)->next)
|
||
;
|
||
place->section = pps;
|
||
#else
|
||
/* Put orphans after the first section on the list. */
|
||
place->section = &place->os->bfd_section->next;
|
||
#endif
|
||
}
|
||
|
||
/* Unlink the section. */
|
||
for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
|
||
;
|
||
*pps = snew->next;
|
||
|
||
/* Now tack it on to the "place->os" section list. */
|
||
snew->next = *place->section;
|
||
*place->section = snew;
|
||
}
|
||
place->section = &snew->next; /* Save the end of this list. */
|
||
|
||
if (place->stmt == NULL)
|
||
{
|
||
/* Put the new statement list right at the head. */
|
||
*add.tail = place->os->header.next;
|
||
place->os->header.next = add.head;
|
||
}
|
||
else
|
||
{
|
||
/* Put it after the last orphan statement we added. */
|
||
*add.tail = *place->stmt;
|
||
*place->stmt = add.head;
|
||
}
|
||
place->stmt = add.tail; /* Save the end of this list. */
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* A variant of lang_output_section_find. */
|
||
static lang_output_section_statement_type *
|
||
output_rel_find ()
|
||
{
|
||
lang_statement_union_type *u;
|
||
lang_output_section_statement_type *lookup;
|
||
|
||
for (u = lang_output_section_statement.head;
|
||
u != (lang_statement_union_type *) NULL;
|
||
u = lookup->next)
|
||
{
|
||
lookup = &u->output_section_statement;
|
||
if (strncmp (".rel", lookup->name, 4) == 0
|
||
&& lookup->bfd_section != NULL
|
||
&& (lookup->bfd_section->flags & SEC_ALLOC) != 0)
|
||
{
|
||
return lookup;
|
||
}
|
||
}
|
||
return (lang_output_section_statement_type *) NULL;
|
||
}
|
||
|
||
/* 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${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* This is called by the before_allocation routine via
|
||
lang_for_each_statement. It locates any assignment statements, and
|
||
tells the ELF backend about them, in case they are assignments to
|
||
symbols which are referred to by dynamic objects. */
|
||
|
||
static void
|
||
gld${EMULATION_NAME}_find_statement_assignment (s)
|
||
lang_statement_union_type *s;
|
||
{
|
||
if (s->header.type == lang_assignment_statement_enum)
|
||
gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
|
||
}
|
||
|
||
/* This is called after the sections have been attached to output
|
||
sections, but before any sizes or addresses have been set. */
|
||
|
||
static void
|
||
gld${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;
|
||
}
|
||
}
|
||
|
||
/* we should be able to set the size of the interworking stub section */
|
||
|
||
/* Here we rummage through the found bfds to collect glue information */
|
||
/* FIXME: should this be based on a command line option? krk@cygnus.com */
|
||
{
|
||
LANG_FOR_EACH_INPUT_STATEMENT (is)
|
||
{
|
||
if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
|
||
no_pipeline_knowledge))
|
||
{
|
||
/* xgettext:c-format */
|
||
einfo (_("Errors encountered processing file %s"), is->filename);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* We have seen it all. Allocate it, and carry on */
|
||
bfd_elf32_arm_allocate_interworking_sections (& link_info);
|
||
}
|
||
|
||
static void
|
||
gld${EMULATION_NAME}_finish PARAMS((void))
|
||
{
|
||
struct bfd_link_hash_entry * h;
|
||
|
||
if (thumb_entry_symbol == NULL)
|
||
return;
|
||
|
||
h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol, false, false, true);
|
||
|
||
if (h != (struct bfd_link_hash_entry *) NULL
|
||
&& (h->type == bfd_link_hash_defined
|
||
|| h->type == bfd_link_hash_defweak)
|
||
&& h->u.def.section->output_section != NULL)
|
||
{
|
||
static char buffer[32];
|
||
bfd_vma val;
|
||
|
||
/* Special procesing is required for a Thumb entry symbol. The
|
||
bottom bit of its address must be set. */
|
||
val = (h->u.def.value
|
||
+ bfd_get_section_vma (output_bfd,
|
||
h->u.def.section->output_section)
|
||
+ h->u.def.section->output_offset);
|
||
|
||
val |= 1;
|
||
|
||
/* Now convert this value into a string and store it in entry_symbol
|
||
where the lang_finish() function will pick it up. */
|
||
buffer[0] = '0';
|
||
buffer[1] = 'x';
|
||
|
||
sprintf_vma (buffer + 2, val);
|
||
|
||
if (entry_symbol != NULL && entry_from_cmdline)
|
||
einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
|
||
thumb_entry_symbol, entry_symbol);
|
||
entry_symbol = buffer;
|
||
}
|
||
else
|
||
einfo (_("%P: warning: connot find thumb start symbol %s\n"), thumb_entry_symbol);
|
||
}
|
||
|
||
static char *
|
||
gld${EMULATION_NAME}_get_script (isfile)
|
||
int *isfile;
|
||
EOF
|
||
|
||
if test -n "$COMPILE_IN"
|
||
then
|
||
# Scripts compiled in.
|
||
|
||
# sed commands to quote an ld script as a C string.
|
||
sc="-f stringify.sed"
|
||
|
||
cat >>e${EMULATION_NAME}.c <<EOF
|
||
{
|
||
*isfile = 0;
|
||
|
||
if (link_info.relocateable == true && config.build_constructors == true)
|
||
return
|
||
EOF
|
||
sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
|
||
echo ' ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c
|
||
echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c
|
||
echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
|
||
if test -n "$GENERATE_SHLIB_SCRIPT" ; then
|
||
echo ' ; else if (link_info.shared) return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.xs >> e${EMULATION_NAME}.c
|
||
fi
|
||
echo ' ; else return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c
|
||
echo '; }' >> e${EMULATION_NAME}.c
|
||
|
||
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}",
|
||
"${OUTPUT_FORMAT}",
|
||
gld${EMULATION_NAME}_finish,
|
||
NULL, /* create output section statements */
|
||
gld${EMULATION_NAME}_open_dynamic_archive,
|
||
gld${EMULATION_NAME}_place_orphan,
|
||
NULL, /* set symbols */
|
||
gld${EMULATION_NAME}_parse_args,
|
||
NULL, /* unrecognized file */
|
||
gld${EMULATION_NAME}_list_options,
|
||
NULL, /* recognized file */
|
||
NULL /* find_potential_libraries */
|
||
};
|
||
EOF
|