6a616ff41c
longer includes machine/elf.h. * consumers of elf.h now use the minimalist elf header possible. This change is motivated by Binutils 2.11.0 and too much clashing over our base elf headers and the Binutils elf headers.
1322 lines
37 KiB
Plaintext
1322 lines
37 KiB
Plaintext
# $FreeBSD$
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# 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 ${EMULATION_NAME}
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Copyright (C) 1991, 93, 94, 95, 96, 97, 98, 99, 2000
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Free Software Foundation, Inc.
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Written by Steve Chamberlain <sac@cygnus.com>
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ELF support by Ian Lance Taylor <ian@cygnus.com>
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This file is part of GLD, the Gnu Linker.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define TARGET_IS_${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${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
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static lang_output_section_statement_type *output_rel_find PARAMS ((void));
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static boolean gld${EMULATION_NAME}_place_orphan
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PARAMS ((lang_input_statement_type *, asection *));
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static 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 = ${DYNAMIC_LINK-true};
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config.has_shared = `if test -n "$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 (or .sl on oddball systems
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like hpux). */
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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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/* This allocates a few bytes too many when EXTRA_SHLIB_EXTENSION
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is defined, but it does not seem worth the headache to optimize
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away those two bytes of space. */
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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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#ifdef EXTRA_SHLIB_EXTENSION
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+ strlen (EXTRA_SHLIB_EXTENSION)
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#endif
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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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#ifdef EXTRA_SHLIB_EXTENSION
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/* Try the .so extension first. If that fails build a new filename
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using EXTRA_SHLIB_EXTENSION. */
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if (! ldfile_try_open_bfd (string, entry))
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sprintf (string, "%s/lib%s%s%s", search->name,
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filename, arch, EXTRA_SHLIB_EXTENSION);
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#endif
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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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/* Rather than duplicating the logic above. Just use the
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filename we recorded earlier.
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First strip off everything before the last '/'. */
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filename = strrchr (entry->filename, '/');
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filename++;
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needed_name = (char *) xmalloc (strlen (filename) + 1);
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strcpy (needed_name, filename);
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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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case ${target} in
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*-*-freebsd*)
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cat >>e${EMULATION_NAME}.c <<EOF
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/*
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* Read the system search path the FreeBSD way rather than like Linux.
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*/
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#include <elf-hints.h>
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static boolean gld${EMULATION_NAME}_check_ld_elf_hints
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PARAMS ((const char *, int));
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static boolean
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gld${EMULATION_NAME}_check_ld_elf_hints (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_elf_hints;
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if (! initialized)
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{
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FILE *f;
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f = fopen (_PATH_ELF_HINTS, FOPEN_RB);
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if (f != NULL)
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{
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|
struct elfhints_hdr hdr;
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if (fread(&hdr, 1, sizeof(hdr), f) == sizeof(hdr) &&
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hdr.magic == ELFHINTS_MAGIC &&
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hdr.version == 1)
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|
{
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|
if (fseek(f, hdr.strtab + hdr.dirlist, SEEK_SET) != -1)
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{
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char *b;
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b = (char *) xmalloc (hdr.dirlistlen + 1);
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if (fread(b, 1, hdr.dirlistlen + 1, f) !=
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hdr.dirlistlen + 1)
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{
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|
free(b);
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|
}
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else
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{
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|
ld_elf_hints = b;
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}
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}
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}
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|
fclose (f);
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|
}
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|
initialized = true;
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|
}
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|
if (ld_elf_hints == NULL)
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return false;
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return gld${EMULATION_NAME}_search_needed (ld_elf_hints, name, force);
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}
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EOF
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;;
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*linux*|*Linux*|*LINUX*)
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cat >>e${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. */
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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${EMULATION_NAME}_search_needed (ld_so_conf, name, force);
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}
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|
EOF
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;;
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esac
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esac
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fi
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cat >>e${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;
|
|
static boolean global_vercheck_failed;
|
|
|
|
/* This is called after all the input files have been opened. */
|
|
|
|
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;
|
|
|
|
/* We only need to worry about this when doing a final link. */
|
|
if (link_info.relocateable || link_info.shared)
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|
return;
|
|
|
|
/* Get the list of files which appear in DT_NEEDED entries in
|
|
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
|
|
the runtime dynamic linker will do. Tracking the files down here
|
|
permits one dynamic object to include another without requiring
|
|
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
|
|
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. */
|
|
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);
|
|
if (global_found)
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|
continue;
|
|
|
|
/* 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
|
|
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
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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${EMULATION_NAME}_search_needed (command_line.rpath,
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l->name, force))
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break;
|
|
if (command_line.rpath_link == NULL
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&& command_line.rpath == NULL)
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{
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|
lib_path = (const char *) getenv ("LD_RUN_PATH");
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if (gld${EMULATION_NAME}_search_needed (lib_path, l->name,
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force))
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break;
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|
}
|
|
EOF
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|
if [ "x${host}" = "x${target}" ] ; then
|
|
case " ${EMULATION_LIBPATH} " in
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*" ${EMULATION_NAME} "*)
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cat >>e${EMULATION_NAME}.c <<EOF
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lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
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if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, force))
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break;
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|
EOF
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|
;;
|
|
esac
|
|
fi
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
len = strlen (l->name);
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|
for (search = search_head; search != NULL; search = search->next)
|
|
{
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|
char *filename;
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|
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|
if (search->cmdline)
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|
continue;
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|
filename = (char *) xmalloc (strlen (search->name) + len + 2);
|
|
sprintf (filename, "%s/%s", search->name, l->name);
|
|
if (gld${EMULATION_NAME}_try_needed (filename, force))
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|
break;
|
|
free (filename);
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|
}
|
|
if (search != NULL)
|
|
break;
|
|
EOF
|
|
if [ "x${host}" = "x${target}" ] ; then
|
|
case " ${EMULATION_LIBPATH} " in
|
|
*" ${EMULATION_NAME} "*)
|
|
case ${target} in
|
|
*-*-freebsd*)
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
if (gld${EMULATION_NAME}_check_ld_elf_hints (l->name, force))
|
|
break;
|
|
EOF
|
|
;;
|
|
*linux*|*Linux*|*LINUX*)
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force))
|
|
break;
|
|
EOF
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|
|
fi
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
}
|
|
|
|
if (force < 2)
|
|
continue;
|
|
|
|
einfo ("%P: warning: %s, needed by %B, not found (try using -rpath or -rpath-link)\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${EMULATION_NAME}_vercheck (s)
|
|
lang_input_statement_type *s;
|
|
{
|
|
const char *soname, *f;
|
|
struct bfd_link_needed_list *l;
|
|
|
|
if (global_vercheck_failed)
|
|
return;
|
|
if (s->the_bfd == NULL
|
|
|| (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0)
|
|
return;
|
|
|
|
soname = bfd_elf_get_dt_soname (s->the_bfd);
|
|
if (soname == NULL)
|
|
soname = bfd_get_filename (s->the_bfd);
|
|
|
|
f = strrchr (soname, '/');
|
|
if (f != NULL)
|
|
++f;
|
|
else
|
|
f = soname;
|
|
|
|
for (l = global_vercheck_needed; l != NULL; l = l->next)
|
|
{
|
|
const char *suffix;
|
|
|
|
if (strcmp (f, l->name) == 0)
|
|
{
|
|
/* Probably can't happen, but it's an easy check. */
|
|
continue;
|
|
}
|
|
|
|
if (strchr (l->name, '/') != NULL)
|
|
continue;
|
|
|
|
suffix = strstr (l->name, ".so.");
|
|
if (suffix == NULL)
|
|
continue;
|
|
|
|
suffix += sizeof ".so." - 1;
|
|
|
|
if (strncmp (f, l->name, suffix - l->name) == 0)
|
|
{
|
|
/* Here we know that S is a dynamic object FOO.SO.VER1, and
|
|
the object we are considering needs a dynamic object
|
|
FOO.SO.VER2, and VER1 and VER2 are different. This
|
|
appears to be a version mismatch, so we tell the caller
|
|
to try a different version of this library. */
|
|
global_vercheck_failed = true;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This is called after the sections have been attached to output
|
|
sections, but before any sizes or addresses have been set. */
|
|
|
|
static void
|
|
gld${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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 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${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* A variant of lang_output_section_find. Used by place_orphan. */
|
|
|
|
static lang_output_section_statement_type *
|
|
output_rel_find ()
|
|
{
|
|
lang_statement_union_type *u;
|
|
lang_output_section_statement_type *lookup;
|
|
|
|
for (u = lang_output_section_statement.head;
|
|
u != (lang_statement_union_type *) NULL;
|
|
u = lookup->next)
|
|
{
|
|
lookup = &u->output_section_statement;
|
|
if (strncmp (".rel", lookup->name, 4) == 0
|
|
&& lookup->bfd_section != NULL
|
|
&& (lookup->bfd_section->flags & SEC_ALLOC) != 0)
|
|
{
|
|
return lookup;
|
|
}
|
|
}
|
|
return (lang_output_section_statement_type *) NULL;
|
|
}
|
|
|
|
/* Place an orphan section. We use this to put random SHF_ALLOC
|
|
sections in the right segment. */
|
|
|
|
struct orphan_save {
|
|
lang_output_section_statement_type *os;
|
|
asection **section;
|
|
lang_statement_union_type **stmt;
|
|
};
|
|
|
|
static boolean
|
|
gld${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;
|
|
const char *outsecname;
|
|
const char *ps = NULL;
|
|
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;
|
|
|
|
place = NULL;
|
|
if ((s->flags & SEC_ALLOC) == 0)
|
|
;
|
|
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 | SEC_READONLY)) == SEC_READONLY
|
|
&& HAVE_SECTION (hold_rodata, ".rodata"))
|
|
place = &hold_rodata;
|
|
else if ((s->flags & (SEC_CODE | SEC_READONLY)) == (SEC_CODE | SEC_READONLY)
|
|
&& hold_text.os != NULL)
|
|
place = &hold_text;
|
|
|
|
#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;
|
|
}
|
|
|
|
/* Start building a list of statements for this section.
|
|
First save the current statement pointer. */
|
|
old = stat_ptr;
|
|
|
|
/* If we have found an appropriate place for the output section
|
|
statements for this orphan, add them to our own private list,
|
|
inserting them later into the global statement list. */
|
|
if (place != NULL)
|
|
{
|
|
stat_ptr = &add;
|
|
lang_list_init (stat_ptr);
|
|
}
|
|
|
|
if (config.build_constructors)
|
|
{
|
|
/* 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')
|
|
{
|
|
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 (config.build_constructors && *ps == '\0')
|
|
{
|
|
char *symname;
|
|
|
|
/* lang_leave_ouput_section_statement resets stat_ptr. Put
|
|
stat_ptr back where we want it. */
|
|
if (place != NULL)
|
|
stat_ptr = &add;
|
|
|
|
symname = (char *) xmalloc (ps - outsecname + sizeof "__stop_");
|
|
sprintf (symname, "__stop_%s", outsecname);
|
|
lang_add_assignment (exp_assop ('=', symname,
|
|
exp_nameop (NAME, ".")));
|
|
}
|
|
|
|
/* Restore the global list pointer. */
|
|
stat_ptr = old;
|
|
|
|
if (place != NULL)
|
|
{
|
|
asection *snew, **pps;
|
|
|
|
snew = os->bfd_section;
|
|
if (place->section != NULL
|
|
|| (place->os->bfd_section != NULL
|
|
&& place->os->bfd_section != snew))
|
|
{
|
|
/* Shuffle the section to make the output file look neater.
|
|
This is really only cosmetic. */
|
|
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 (add.head != NULL)
|
|
{
|
|
/* We try to put the output statements in some sort of
|
|
reasonable order here, because they determine the final
|
|
load addresses of the orphan sections. */
|
|
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;
|
|
}
|
|
|
|
/* Fix the global list pointer if we happened to tack our
|
|
new list at the tail. */
|
|
if (*old->tail == add.head)
|
|
old->tail = add.tail;
|
|
|
|
/* Save the end of this list. */
|
|
place->stmt = add.tail;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
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/${EMULATION_NAME}.x";
|
|
}
|
|
EOF
|
|
|
|
fi
|
|
|
|
if test -n "$PARSE_AND_LIST_ARGS" ; then
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
static int gld_${EMULATION_NAME}_parse_args PARAMS ((int, char **));
|
|
static void gld_${EMULATION_NAME}_list_options PARAMS ((FILE * file));
|
|
|
|
$PARSE_AND_LIST_ARGS
|
|
EOF
|
|
else
|
|
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
#define gld_${EMULATION_NAME}_parse_args NULL
|
|
#define gld_${EMULATION_NAME}_list_options NULL
|
|
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, /* 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
|