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binutils-gdb/ld/emultempl/elf32.em

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# This shell script emits a C file. -*- C -*-
# It does some substitutions.
# This file is now misnamed, because it supports both 32 bit and 64 bit
# ELF emulations.
test -z "${ELFSIZE}" && ELFSIZE=32
if [ -z "$MACHINE" ]; then
OUTPUT_ARCH=${ARCH}
else
OUTPUT_ARCH=${ARCH}:${MACHINE}
fi
fragment <<EOF
/* This file is is generated by a shell script. DO NOT EDIT! */
/* ${ELFSIZE} bit ELF emulation code for ${EMULATION_NAME}
Copyright 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
Written by Steve Chamberlain <sac@cygnus.com>
ELF support by Ian Lance Taylor <ian@cygnus.com>
This file is part of the GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#define TARGET_IS_${EMULATION_NAME}
#include "sysdep.h"
#include "bfd.h"
#include "libiberty.h"
#include "safe-ctype.h"
#include "getopt.h"
#include "md5.h"
#include "sha1.h"
#include <fcntl.h>
#include "bfdlink.h"
#include "ld.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldfile.h"
#include "ldemul.h"
#include <ldgram.h>
#include "elf/common.h"
#include "elf-bfd.h"
/* Declare functions used by various EXTRA_EM_FILEs. */
static void gld${EMULATION_NAME}_before_parse (void);
static void gld${EMULATION_NAME}_after_open (void);
static void gld${EMULATION_NAME}_before_allocation (void);
static bfd_boolean gld${EMULATION_NAME}_place_orphan
(asection *, const char *, int);
static void gld${EMULATION_NAME}_finish (void);
EOF
if [ "x${USE_LIBPATH}" = xyes ] ; then
case ${target} in
*-*-linux-* | *-*-k*bsd*-*)
fragment <<EOF
#ifdef HAVE_GLOB
#include <glob.h>
#endif
EOF
;;
esac
fi
# Import any needed special functions and/or overrides.
#
source_em ${srcdir}/emultempl/elf-generic.em
if test -n "$EXTRA_EM_FILE" ; then
source_em ${srcdir}/emultempl/${EXTRA_EM_FILE}.em
fi
# Functions in this file can be overridden by setting the LDEMUL_* shell
# variables. If the name of the overriding function is the same as is
# defined in this file, then don't output this file's version.
# If a different overriding name is given then output the standard function
# as presumably it is called from the overriding function.
#
if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then
fragment <<EOF
static void
gld${EMULATION_NAME}_before_parse (void)
{
ldfile_set_output_arch ("${OUTPUT_ARCH}", bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`);
config.dynamic_link = ${DYNAMIC_LINK-TRUE};
config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
}
EOF
fi
if test x"$LDEMUL_RECOGNIZED_FILE" != xgld"${EMULATION_NAME}"_load_symbols; then
fragment <<EOF
/* Handle as_needed DT_NEEDED. */
static bfd_boolean
gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *entry)
{
int class = 0;
/* Tell the ELF linker that we don't want the output file to have a
DT_NEEDED entry for this file, unless it is used to resolve
references in a regular object. */
if (entry->as_needed)
class = DYN_AS_NEEDED;
/* Tell the ELF linker that we don't want the output file to have a
DT_NEEDED entry for any dynamic library in DT_NEEDED tags from
this file at all. */
if (!entry->add_needed)
class |= DYN_NO_ADD_NEEDED;
if (entry->just_syms_flag
&& (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) != 0)
einfo (_("%P%F: --just-symbols may not be used on DSO: %B\n"),
entry->the_bfd);
if (!class
|| (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) == 0)
return FALSE;
bfd_elf_set_dyn_lib_class (entry->the_bfd, class);
/* Continue on with normal load_symbols processing. */
return FALSE;
}
EOF
fi
fragment <<EOF
/* These variables are required to pass information back and forth
between after_open and check_needed and stat_needed and vercheck. */
static struct bfd_link_needed_list *global_needed;
static struct stat global_stat;
static lang_input_statement_type *global_found;
static struct bfd_link_needed_list *global_vercheck_needed;
static bfd_boolean global_vercheck_failed;
/* 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 are checking. This sets GLOBAL_VERCHECK_FAILED if we find
a conflicting version. */
static void
gld${EMULATION_NAME}_vercheck (lang_input_statement_type *s)
{
const char *soname;
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 = lbasename (bfd_get_filename (s->the_bfd));
for (l = global_vercheck_needed; l != NULL; l = l->next)
{
const char *suffix;
if (strcmp (soname, 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 (soname, 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;
}
}
}
/* See if an input file matches a DT_NEEDED entry by running stat on
the file. */
static void
gld${EMULATION_NAME}_stat_needed (lang_input_statement_type *s)
{
struct stat st;
const char *suffix;
const char *soname;
if (global_found != NULL)
return;
if (s->the_bfd == NULL)
return;
/* If this input file was an as-needed entry, and wasn't found to be
needed at the stage it was linked, then don't say we have loaded it. */
if ((bfd_elf_get_dyn_lib_class (s->the_bfd) & DYN_AS_NEEDED) != 0)
return;
if (bfd_stat (s->the_bfd, &st) != 0)
{
einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd);
return;
}
/* Some operating systems, e.g. Windows, do not provide a meaningful
st_ino; they always set it to zero. (Windows does provide a
meaningful st_dev.) Do not indicate a duplicate library in that
case. While there is no guarantee that a system that provides
meaningful inode numbers will never set st_ino to zero, this is
merely an optimization, so we do not need to worry about false
negatives. */
if (st.st_dev == global_stat.st_dev
&& st.st_ino == global_stat.st_ino
&& st.st_ino != 0)
{
global_found = s;
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
heuristic 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 = lbasename (s->filename);
if (strncmp (soname, 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, soname);
}
struct dt_needed
{
bfd *by;
const char *name;
};
/* 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 bfd_boolean
gld${EMULATION_NAME}_try_needed (struct dt_needed *needed,
int force)
{
bfd *abfd;
const char *name = needed->name;
const char *soname;
int class;
abfd = bfd_openr (name, bfd_get_target (link_info.output_bfd));
if (abfd == NULL)
return FALSE;
if (! bfd_check_format (abfd, bfd_object))
{
bfd_close (abfd);
return FALSE;
}
if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
{
bfd_close (abfd);
return FALSE;
}
/* For DT_NEEDED, they have to match. */
if (abfd->xvec != link_info.output_bfd->xvec)
{
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)
{
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 ${target} in
*-*-linux-* | *-*-k*bsd*-*)
fragment <<EOF
{
struct bfd_link_needed_list *l;
for (l = needed; l != NULL; l = l->next)
if (CONST_STRNEQ (l->name, "libc.so"))
break;
if (l == NULL)
{
bfd_close (abfd);
return FALSE;
}
}
EOF
;;
esac
fragment <<EOF
}
}
/* We've found a dynamic object matching the DT_NEEDED entry. */
/* We have already checked that there is no other input file of the
same name. We must now check again that we are not including the
same file twice. We need to do this because on many systems
libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will
reference libc.so.1. If we have already included libc.so, we
don't want to include libc.so.1 if they are the same file, and we
can only check that using stat. */
if (bfd_stat (abfd, &global_stat) != 0)
einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd);
/* First strip off everything before the last '/'. */
soname = lbasename (abfd->filename);
if (trace_file_tries)
info_msg (_("found %s at %s\n"), soname, name);
global_found = NULL;
lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed);
if (global_found != NULL)
{
/* Return TRUE to indicate that we found the file, even though
we aren't going to do anything with it. */
return TRUE;
}
/* Specify the soname to use. */
bfd_elf_set_dt_needed_name (abfd, soname);
/* Tell the ELF linker that we don't want the output file to have a
DT_NEEDED entry for this file, unless it is used to resolve
references in a regular object. */
class = DYN_DT_NEEDED;
/* Tell the ELF linker that we don't want the output file to have a
DT_NEEDED entry for this file at all if the entry is from a file
with DYN_NO_ADD_NEEDED. */
if (needed->by != NULL
&& (bfd_elf_get_dyn_lib_class (needed->by) & DYN_NO_ADD_NEEDED) != 0)
class |= DYN_NO_NEEDED | DYN_NO_ADD_NEEDED;
bfd_elf_set_dyn_lib_class (abfd, class);
/* 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;
}
/* Search for a needed file in a path. */
static bfd_boolean
gld${EMULATION_NAME}_search_needed (const char *path,
struct dt_needed *n, int force)
{
const char *s;
const char *name = n->name;
size_t len;
struct dt_needed needed;
if (name[0] == '/')
return gld${EMULATION_NAME}_try_needed (n, force);
if (path == NULL || *path == '\0')
return FALSE;
needed.by = n->by;
needed.name = n->name;
len = strlen (name);
while (1)
{
char *filename, *sset;
s = strchr (path, config.rpath_separator);
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);
needed.name = filename;
if (gld${EMULATION_NAME}_try_needed (&needed, force))
return TRUE;
free (filename);
if (*s == '\0')
break;
path = s + 1;
}
return FALSE;
}
EOF
if [ "x${USE_LIBPATH}" = xyes ] ; then
fragment <<EOF
/* Add the sysroot to every entry in a path separated by
config.rpath_separator. */
static char *
gld${EMULATION_NAME}_add_sysroot (const char *path)
{
int len, colons, i;
char *ret, *p;
len = strlen (path);
colons = 0;
i = 0;
while (path[i])
if (path[i++] == config.rpath_separator)
colons++;
if (path[i])
colons++;
len = len + (colons + 1) * strlen (ld_sysroot);
ret = xmalloc (len + 1);
strcpy (ret, ld_sysroot);
p = ret + strlen (ret);
i = 0;
while (path[i])
if (path[i] == config.rpath_separator)
{
*p++ = path[i++];
strcpy (p, ld_sysroot);
p = p + strlen (p);
}
else
*p++ = path[i++];
*p = 0;
return ret;
}
EOF
case ${target} in
*-*-freebsd* | *-*-dragonfly*)
fragment <<EOF
/* Read the system search path the FreeBSD way rather than the Linux way. */
#ifdef HAVE_ELF_HINTS_H
#include <elf-hints.h>
#else
#include "elf-hints-local.h"
#endif
static bfd_boolean
gld${EMULATION_NAME}_check_ld_elf_hints (const char *name, int force)
{
static bfd_boolean initialized;
static char *ld_elf_hints;
struct dt_needed needed;
if (!initialized)
{
FILE *f;
char *tmppath;
tmppath = concat (ld_sysroot, _PATH_ELF_HINTS, (const char *) NULL);
f = fopen (tmppath, FOPEN_RB);
free (tmppath);
if (f != NULL)
{
struct elfhints_hdr hdr;
if (fread (&hdr, 1, sizeof (hdr), f) == sizeof (hdr)
&& hdr.magic == ELFHINTS_MAGIC
&& hdr.version == 1)
{
if (fseek (f, hdr.strtab + hdr.dirlist, SEEK_SET) != -1)
{
char *b;
b = xmalloc (hdr.dirlistlen + 1);
if (fread (b, 1, hdr.dirlistlen + 1, f) ==
hdr.dirlistlen + 1)
ld_elf_hints = gld${EMULATION_NAME}_add_sysroot (b);
free (b);
}
}
fclose (f);
}
initialized = TRUE;
}
if (ld_elf_hints == NULL)
return FALSE;
needed.by = NULL;
needed.name = name;
return gld${EMULATION_NAME}_search_needed (ld_elf_hints, & needed,
force);
}
EOF
# FreeBSD
;;
*-*-linux-* | *-*-k*bsd*-*)
fragment <<EOF
/* For a native linker, check the file /etc/ld.so.conf for directories
in which we may find shared libraries. /etc/ld.so.conf is really
only meaningful on Linux. */
struct gld${EMULATION_NAME}_ld_so_conf
{
char *path;
size_t len, alloc;
};
static bfd_boolean
gld${EMULATION_NAME}_parse_ld_so_conf
(struct gld${EMULATION_NAME}_ld_so_conf *info, const char *filename);
static void
gld${EMULATION_NAME}_parse_ld_so_conf_include
(struct gld${EMULATION_NAME}_ld_so_conf *info, const char *filename,
const char *pattern)
{
char *newp = NULL;
#ifdef HAVE_GLOB
glob_t gl;
#endif
if (pattern[0] != '/')
{
char *p = strrchr (filename, '/');
size_t patlen = strlen (pattern) + 1;
newp = xmalloc (p - filename + 1 + patlen);
memcpy (newp, filename, p - filename + 1);
memcpy (newp + (p - filename + 1), pattern, patlen);
pattern = newp;
}
#ifdef HAVE_GLOB
if (glob (pattern, 0, NULL, &gl) == 0)
{
size_t i;
for (i = 0; i < gl.gl_pathc; ++i)
gld${EMULATION_NAME}_parse_ld_so_conf (info, gl.gl_pathv[i]);
globfree (&gl);
}
#else
/* If we do not have glob, treat the pattern as a literal filename. */
gld${EMULATION_NAME}_parse_ld_so_conf (info, pattern);
#endif
if (newp)
free (newp);
}
static bfd_boolean
gld${EMULATION_NAME}_parse_ld_so_conf
(struct gld${EMULATION_NAME}_ld_so_conf *info, const char *filename)
{
FILE *f = fopen (filename, FOPEN_RT);
char *line;
size_t linelen;
if (f == NULL)
return FALSE;
linelen = 256;
line = xmalloc (linelen);
do
{
char *p = line, *q;
/* Normally this would use getline(3), but we need to be portable. */
while ((q = fgets (p, linelen - (p - line), f)) != NULL
&& strlen (q) == linelen - (p - line) - 1
&& line[linelen - 2] != '\n')
{
line = xrealloc (line, 2 * linelen);
p = line + linelen - 1;
linelen += linelen;
}
if (q == NULL && p == line)
break;
p = strchr (line, '\n');
if (p)
*p = '\0';
/* Because the file format does not know any form of quoting we
can search forward for the next '#' character and if found
make it terminating the line. */
p = strchr (line, '#');
if (p)
*p = '\0';
/* Remove leading whitespace. NUL is no whitespace character. */
p = line;
while (*p == ' ' || *p == '\f' || *p == '\r' || *p == '\t' || *p == '\v')
++p;
/* If the line is blank it is ignored. */
if (p[0] == '\0')
continue;
if (CONST_STRNEQ (p, "include") && (p[7] == ' ' || p[7] == '\t'))
{
char *dir, c;
p += 8;
do
{
while (*p == ' ' || *p == '\t')
++p;
if (*p == '\0')
break;
dir = p;
while (*p != ' ' && *p != '\t' && *p)
++p;
c = *p;
*p++ = '\0';
if (dir[0] != '\0')
gld${EMULATION_NAME}_parse_ld_so_conf_include (info, filename,
dir);
}
while (c != '\0');
}
else
{
char *dir = p;
while (*p && *p != '=' && *p != ' ' && *p != '\t' && *p != '\f'
&& *p != '\r' && *p != '\v')
++p;
while (p != dir && p[-1] == '/')
--p;
if (info->path == NULL)
{
info->alloc = p - dir + 1 + 256;
info->path = xmalloc (info->alloc);
info->len = 0;
}
else
{
if (info->len + 1 + (p - dir) >= info->alloc)
{
info->alloc += p - dir + 256;
info->path = xrealloc (info->path, info->alloc);
}
info->path[info->len++] = config.rpath_separator;
}
memcpy (info->path + info->len, dir, p - dir);
info->len += p - dir;
info->path[info->len] = '\0';
}
}
while (! feof (f));
free (line);
fclose (f);
return TRUE;
}
static bfd_boolean
gld${EMULATION_NAME}_check_ld_so_conf (const char *name, int force)
{
static bfd_boolean initialized;
static char *ld_so_conf;
struct dt_needed needed;
if (! initialized)
{
char *tmppath;
struct gld${EMULATION_NAME}_ld_so_conf info;
info.path = NULL;
info.len = info.alloc = 0;
tmppath = concat (ld_sysroot, "${prefix}/etc/ld.so.conf",
(const char *) NULL);
if (!gld${EMULATION_NAME}_parse_ld_so_conf (&info, tmppath))
{
free (tmppath);
tmppath = concat (ld_sysroot, "/etc/ld.so.conf",
(const char *) NULL);
gld${EMULATION_NAME}_parse_ld_so_conf (&info, tmppath);
}
free (tmppath);
if (info.path)
{
char *d = gld${EMULATION_NAME}_add_sysroot (info.path);
free (info.path);
ld_so_conf = d;
}
initialized = TRUE;
}
if (ld_so_conf == NULL)
return FALSE;
needed.by = NULL;
needed.name = name;
return gld${EMULATION_NAME}_search_needed (ld_so_conf, &needed, force);
}
EOF
# Linux
;;
esac
fi
fragment <<EOF
/* See if an input file matches a DT_NEEDED entry by name. */
static void
gld${EMULATION_NAME}_check_needed (lang_input_statement_type *s)
{
const char *soname;
/* Stop looking if we've found a loaded lib. */
if (global_found != NULL
&& (bfd_elf_get_dyn_lib_class (global_found->the_bfd)
& DYN_AS_NEEDED) == 0)
return;
if (s->filename == NULL || s->the_bfd == NULL)
return;
/* Don't look for a second non-loaded as-needed lib. */
if (global_found != NULL
&& (bfd_elf_get_dyn_lib_class (s->the_bfd) & DYN_AS_NEEDED) != 0)
return;
if (strcmp (s->filename, global_needed->name) == 0)
{
global_found = s;
return;
}
if (s->search_dirs_flag)
{
const char *f = strrchr (s->filename, '/');
if (f != NULL
&& strcmp (f + 1, global_needed->name) == 0)
{
global_found = s;
return;
}
}
soname = bfd_elf_get_dt_soname (s->the_bfd);
if (soname != NULL
&& strcmp (soname, global_needed->name) == 0)
{
global_found = s;
return;
}
}
EOF
if test x"$LDEMUL_AFTER_OPEN" != xgld"$EMULATION_NAME"_after_open; then
fragment <<EOF
static bfd_size_type
gld${EMULATION_NAME}_id_note_section_size (bfd *abfd,
struct bfd_link_info *link_info)
{
const char *style = link_info->emit_note_gnu_build_id;
bfd_size_type size;
abfd = abfd;
size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
size = (size + 3) & -(bfd_size_type) 4;
if (!strcmp (style, "md5") || !strcmp (style, "uuid"))
size += 128 / 8;
else if (!strcmp (style, "sha1"))
size += 160 / 8;
else if (!strncmp (style, "0x", 2))
{
/* ID is in string form (hex). Convert to bits. */
const char *id = style + 2;
do
{
if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
{
++size;
id += 2;
}
else if (*id == '-' || *id == ':')
++id;
else
{
size = 0;
break;
}
} while (*id != '\0');
}
else
size = 0;
return size;
}
static unsigned char
read_hex (const char xdigit)
{
if (ISDIGIT (xdigit))
return xdigit - '0';
if (ISUPPER (xdigit))
return xdigit - 'A' + 0xa;
if (ISLOWER (xdigit))
return xdigit - 'a' + 0xa;
abort ();
return 0;
}
struct build_id_info
{
const char *style;
asection *sec;
};
static bfd_boolean
gld${EMULATION_NAME}_write_build_id_section (bfd *abfd)
{
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
struct build_id_info *info =
elf_tdata (abfd)->after_write_object_contents_info;
asection *asec;
Elf_Internal_Shdr *i_shdr;
unsigned char *contents, *id_bits;
bfd_size_type size;
Elf_External_Note *e_note;
asec = info->sec;
if (bfd_is_abs_section (asec->output_section))
{
einfo (_("%P: warning: .note.gnu.build-id section discarded,"
" --build-id ignored.\n"));
return TRUE;
}
i_shdr = &elf_section_data (asec->output_section)->this_hdr;
if (i_shdr->contents == NULL)
{
if (asec->contents == NULL)
asec->contents = xmalloc (asec->size);
contents = asec->contents;
}
else
contents = i_shdr->contents + asec->output_offset;
e_note = (void *) contents;
size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
size = (size + 3) & -(bfd_size_type) 4;
id_bits = contents + size;
size = asec->size - size;
bfd_h_put_32 (abfd, sizeof "GNU", &e_note->namesz);
bfd_h_put_32 (abfd, size, &e_note->descsz);
bfd_h_put_32 (abfd, NT_GNU_BUILD_ID, &e_note->type);
memcpy (e_note->name, "GNU", sizeof "GNU");
if (!strcmp (info->style, "md5"))
{
struct md5_ctx ctx;
md5_init_ctx (&ctx);
if (bed->s->checksum_contents (abfd,
(void (*) (const void *, size_t, void *))
&md5_process_bytes,
&ctx))
md5_finish_ctx (&ctx, id_bits);
else
return FALSE;
}
else if (!strcmp (info->style, "sha1"))
{
struct sha1_ctx ctx;
sha1_init_ctx (&ctx);
if (bed->s->checksum_contents (abfd,
(void (*) (const void *, size_t, void *))
&sha1_process_bytes,
&ctx))
sha1_finish_ctx (&ctx, id_bits);
else
return FALSE;
}
else if (!strcmp (info->style, "uuid"))
{
int n;
int fd = open ("/dev/urandom", O_RDONLY);
if (fd < 0)
return FALSE;
n = read (fd, id_bits, size);
close (fd);
if (n < (int) size)
return FALSE;
}
else if (!strncmp (info->style, "0x", 2))
{
/* ID is in string form (hex). Convert to bits. */
const char *id = info->style + 2;
size_t n = 0;
do
{
if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
{
id_bits[n] = read_hex (*id++) << 4;
id_bits[n++] |= read_hex (*id++);
}
else if (*id == '-' || *id == ':')
++id;
else
abort (); /* Should have been validated earlier. */
} while (*id != '\0');
}
else
abort (); /* Should have been validated earlier. */
size = asec->size;
return (bfd_seek (abfd,
i_shdr->sh_offset + asec->output_offset, SEEK_SET) == 0
&& bfd_bwrite (contents, size, abfd) == size);
}
/* This is called after all the input files have been opened. */
static void
gld${EMULATION_NAME}_after_open (void)
{
struct bfd_link_needed_list *needed, *l;
struct elf_link_hash_table *htab;
htab = elf_hash_table (&link_info);
if (!is_elf_hash_table (htab))
return;
if (link_info.emit_note_gnu_build_id)
{
bfd *abfd;
asection *s;
bfd_size_type size;
abfd = link_info.input_bfds;
size = gld${EMULATION_NAME}_id_note_section_size (abfd, &link_info);
if (size == 0)
{
einfo ("%P: warning: unrecognized --build-id style ignored.\n");
free (link_info.emit_note_gnu_build_id);
link_info.emit_note_gnu_build_id = NULL;
}
else
{
s = bfd_make_section_with_flags (abfd, ".note.gnu.build-id",
SEC_ALLOC | SEC_LOAD
| SEC_IN_MEMORY | SEC_LINKER_CREATED
| SEC_READONLY | SEC_DATA);
if (s != NULL && bfd_set_section_alignment (abfd, s, 2))
{
struct elf_obj_tdata *t = elf_tdata (link_info.output_bfd);
struct build_id_info *b = xmalloc (sizeof *b);
b->style = link_info.emit_note_gnu_build_id;
b->sec = s;
elf_section_type (s) = SHT_NOTE;
s->size = size;
t->after_write_object_contents
= &gld${EMULATION_NAME}_write_build_id_section;
t->after_write_object_contents_info = b;
}
else
{
einfo ("%P: warning: Cannot create .note.gnu.build-id section,"
" --build-id ignored.\n");
free (link_info.emit_note_gnu_build_id);
link_info.emit_note_gnu_build_id = NULL;
}
}
}
if (link_info.relocatable)
return;
if (link_info.eh_frame_hdr
&& !link_info.traditional_format)
{
bfd *abfd;
asection *s;
for (abfd = link_info.input_bfds; abfd; abfd = abfd->link_next)
{
s = bfd_get_section_by_name (abfd, ".eh_frame");
if (s && s->size > 8 && !bfd_is_abs_section (s->output_section))
break;
}
if (abfd)
{
const struct elf_backend_data *bed;
bed = get_elf_backend_data (abfd);
s = bfd_make_section_with_flags (abfd, ".eh_frame_hdr",
bed->dynamic_sec_flags
| SEC_READONLY);
if (s != NULL
&& bfd_set_section_alignment (abfd, s, 2))
htab->eh_info.hdr_sec = s;
else
einfo ("%P: warning: Cannot create .eh_frame_hdr section,"
" --eh-frame-hdr ignored.\n");
}
}
/* 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
needed list can actually grow while we are stepping through this
loop. */
if (!link_info.executable)
return;
needed = bfd_elf_get_needed_list (link_info.output_bfd, &link_info);
for (l = needed; l != NULL; l = l->next)
{
struct bfd_link_needed_list *ll;
struct dt_needed n, nn;
int force;
/* If the lib that needs this one was --as-needed and wasn't
found to be needed, then this lib isn't needed either. */
if (l->by != NULL
&& (bfd_elf_get_dyn_lib_class (l->by) & DYN_AS_NEEDED) != 0)
continue;
/* If we've already seen this file, skip it. */
for (ll = needed; ll != l; ll = ll->next)
if ((ll->by == NULL
|| (bfd_elf_get_dyn_lib_class (ll->by) & DYN_AS_NEEDED) == 0)
&& strcmp (ll->name, l->name) == 0)
break;
if (ll != l)
continue;
/* See if this file was included in the link explicitly. */
global_needed = l;
global_found = NULL;
lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
if (global_found != NULL
&& (bfd_elf_get_dyn_lib_class (global_found->the_bfd)
& DYN_AS_NEEDED) == 0)
continue;
n.by = l->by;
n.name = l->name;
nn.by = l->by;
if (trace_file_tries)
info_msg (_("%s needed by %B\n"), l->name, l->by);
/* As-needed libs specified on the command line (or linker script)
take priority over libs found in search dirs. */
if (global_found != NULL)
{
nn.name = global_found->filename;
if (gld${EMULATION_NAME}_try_needed (&nn, TRUE))
continue;
}
/* We need to find this file and include the symbol table. We
want to search for the file in the same way that the dynamic
linker will search. That means that we want to use
rpath_link, rpath, then the environment variable
LD_LIBRARY_PATH (native only), then the DT_RPATH/DT_RUNPATH
entries (native only), then the linker script LIB_SEARCH_DIRS.
We do not search using the -L arguments.
We search twice. The first time, we skip objects which may
introduce version mismatches. The second time, we force
their use. See gld${EMULATION_NAME}_vercheck comment. */
for (force = 0; force < 2; force++)
{
size_t len;
search_dirs_type *search;
EOF
if [ "x${NATIVE}" = xyes ] ; then
fragment <<EOF
const char *lib_path;
EOF
fi
if [ "x${USE_LIBPATH}" = xyes ] ; then
fragment <<EOF
struct bfd_link_needed_list *rp;
int found;
EOF
fi
fragment <<EOF
if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
&n, force))
break;
EOF
if [ "x${USE_LIBPATH}" = xyes ] ; then
fragment <<EOF
if (gld${EMULATION_NAME}_search_needed (command_line.rpath,
&n, force))
break;
EOF
fi
if [ "x${NATIVE}" = xyes ] ; then
fragment <<EOF
if (command_line.rpath_link == NULL
&& command_line.rpath == NULL)
{
lib_path = (const char *) getenv ("LD_RUN_PATH");
if (gld${EMULATION_NAME}_search_needed (lib_path, &n,
force))
break;
}
lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
if (gld${EMULATION_NAME}_search_needed (lib_path, &n, force))
break;
EOF
fi
if [ "x${USE_LIBPATH}" = xyes ] ; then
fragment <<EOF
found = 0;
rp = bfd_elf_get_runpath_list (link_info.output_bfd, &link_info);
for (; !found && rp != NULL; rp = rp->next)
{
char *tmpname = gld${EMULATION_NAME}_add_sysroot (rp->name);
found = (rp->by == l->by
&& gld${EMULATION_NAME}_search_needed (tmpname,
&n,
force));
free (tmpname);
}
if (found)
break;
EOF
fi
if [ "x${USE_LIBPATH}" = xyes ] ; then
case ${target} in
*-*-freebsd* | *-*-dragonfly*)
fragment <<EOF
if (gld${EMULATION_NAME}_check_ld_elf_hints (l->name, force))
break;
EOF
# FreeBSD
;;
*-*-linux-* | *-*-k*bsd*-*)
# Linux
fragment <<EOF
if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force))
break;
EOF
;;
esac
fi
fragment <<EOF
len = strlen (l->name);
for (search = search_head; search != NULL; search = search->next)
{
char *filename;
if (search->cmdline)
continue;
filename = (char *) xmalloc (strlen (search->name) + len + 2);
sprintf (filename, "%s/%s", search->name, l->name);
nn.name = filename;
if (gld${EMULATION_NAME}_try_needed (&nn, force))
break;
free (filename);
}
if (search != NULL)
break;
EOF
fragment <<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);
}
}
EOF
fi
fragment <<EOF
/* Look through an expression for an assignment statement. */
static void
gld${EMULATION_NAME}_find_exp_assignment (etree_type *exp)
{
bfd_boolean provide = FALSE;
switch (exp->type.node_class)
{
case etree_provide:
provide = TRUE;
/* Fall thru */
case etree_assign:
/* We call record_link_assignment even if the symbol is defined.
This is because if it is defined by a dynamic object, we
actually want to use the value defined by the linker script,
not the value from the dynamic object (because we are setting
symbols like etext). If the symbol is defined by a regular
object, then, as it happens, calling record_link_assignment
will do no harm. */
if (strcmp (exp->assign.dst, ".") != 0)
{
if (!bfd_elf_record_link_assignment (link_info.output_bfd,
&link_info,
exp->assign.dst, provide,
exp->assign.hidden))
einfo ("%P%F: failed to record assignment to %s: %E\n",
exp->assign.dst);
}
gld${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${EMULATION_NAME}_find_statement_assignment (lang_statement_union_type *s)
{
if (s->header.type == lang_assignment_statement_enum)
gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
}
EOF
if test x"$LDEMUL_BEFORE_ALLOCATION" != xgld"$EMULATION_NAME"_before_allocation; then
if test x"${ELF_INTERPRETER_NAME+set}" = xset; then
ELF_INTERPRETER_SET_DEFAULT="
if (sinterp != NULL)
{
sinterp->contents = (unsigned char *) ${ELF_INTERPRETER_NAME};
sinterp->size = strlen ((char *) sinterp->contents) + 1;
}
"
else
ELF_INTERPRETER_SET_DEFAULT=
fi
fragment <<EOF
/* This is called after the sections have been attached to output
sections, but before any sizes or addresses have been set. */
static void
gld${EMULATION_NAME}_before_allocation (void)
{
const char *rpath;
asection *sinterp;
if (link_info.hash->type == bfd_link_elf_hash_table)
_bfd_elf_tls_setup (link_info.output_bfd, &link_info);
/* 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_size_dynamic_sections
(link_info.output_bfd, command_line.soname, rpath,
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");
${ELF_INTERPRETER_SET_DEFAULT}
/* Let the user override the dynamic linker we are using. */
if (command_line.interpreter != NULL
&& sinterp != NULL)
{
sinterp->contents = (bfd_byte *) command_line.interpreter;
sinterp->size = strlen (command_line.interpreter) + 1;
}
/* Look for any sections named .gnu.warning. As a GNU extensions,
we treat such sections as containing warning messages. We print
out the warning message, and then zero out the section size so
that it does not get copied into the output file. */
{
LANG_FOR_EACH_INPUT_STATEMENT (is)
{
asection *s;
bfd_size_type sz;
char *msg;
bfd_boolean ret;
if (is->just_syms_flag)
continue;
s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
if (s == NULL)
continue;
sz = s->size;
msg = xmalloc ((size_t) (sz + 1));
if (! bfd_get_section_contents (is->the_bfd, s, msg,
(file_ptr) 0, sz))
einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
is->the_bfd);
msg[sz] = '\0';
ret = link_info.callbacks->warning (&link_info, msg,
(const char *) NULL,
is->the_bfd, (asection *) NULL,
(bfd_vma) 0);
ASSERT (ret);
free (msg);
/* Clobber the section size, so that we don't waste space
copying the warning into the output file. If we've already
sized the output section, adjust its size. The adjustment
is on rawsize because targets that size sections early will
have called lang_reset_memory_regions after sizing. */
if (s->output_section != NULL
&& s->output_section->rawsize >= s->size)
s->output_section->rawsize -= s->size;
s->size = 0;
/* Also set SEC_EXCLUDE, so that local symbols defined in the
warning section don't get copied to the output. */
s->flags |= SEC_EXCLUDE | SEC_KEEP;
}
}
before_allocation_default ();
if (!bfd_elf_size_dynsym_hash_dynstr (link_info.output_bfd, &link_info))
einfo ("%P%F: failed to set dynamic section sizes: %E\n");
}
EOF
fi
if test x"$LDEMUL_OPEN_DYNAMIC_ARCHIVE" != xgld"$EMULATION_NAME"_open_dynamic_archive; then
fragment <<EOF
/* Try to open a dynamic archive. This is where we know that ELF
dynamic libraries have an extension of .so (or .sl on oddball systems
like hpux). */
static bfd_boolean
gld${EMULATION_NAME}_open_dynamic_archive
(const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
{
const char *filename;
char *string;
if (! entry->is_archive)
return FALSE;
filename = entry->filename;
/* This allocates a few bytes too many when EXTRA_SHLIB_EXTENSION
is defined, but it does not seem worth the headache to optimize
away those two bytes of space. */
string = (char *) xmalloc (strlen (search->name)
+ strlen (filename)
+ strlen (arch)
#ifdef EXTRA_SHLIB_EXTENSION
+ strlen (EXTRA_SHLIB_EXTENSION)
#endif
+ sizeof "/lib.so");
sprintf (string, "%s/lib%s%s.so", search->name, filename, arch);
#ifdef EXTRA_SHLIB_EXTENSION
/* Try the .so extension first. If that fails build a new filename
using EXTRA_SHLIB_EXTENSION. */
if (! ldfile_try_open_bfd (string, entry))
{
sprintf (string, "%s/lib%s%s%s", search->name,
filename, arch, EXTRA_SHLIB_EXTENSION);
#endif
if (! ldfile_try_open_bfd (string, entry))
{
free (string);
return FALSE;
}
#ifdef EXTRA_SHLIB_EXTENSION
}
#endif
entry->filename = string;
/* We have found a dynamic object to include in the link. The ELF
backend linker will create a DT_NEEDED entry in the .dynamic
section naming this file. If this file includes a DT_SONAME
entry, it will be used. Otherwise, the ELF linker will just use
the name of the file. For an archive found by searching, like
this one, the DT_NEEDED entry should consist of just the name of
the file, without the path information used to find it. Note
that we only need to do this if we have a dynamic object; an
archive will never be referenced by a DT_NEEDED entry.
FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
very pretty. I haven't been able to think of anything that is
pretty, though. */
if (bfd_check_format (entry->the_bfd, bfd_object)
&& (entry->the_bfd->flags & DYNAMIC) != 0)
{
ASSERT (entry->is_archive && entry->search_dirs_flag);
/* Rather than duplicating the logic above. Just use the
filename we recorded earlier. */
filename = lbasename (entry->filename);
bfd_elf_set_dt_needed_name (entry->the_bfd, filename);
}
return TRUE;
}
EOF
fi
if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then
fragment <<EOF
/* A variant of lang_output_section_find used by place_orphan. */
static lang_output_section_statement_type *
output_rel_find (asection *sec, int isdyn)
{
lang_output_section_statement_type *lookup;
lang_output_section_statement_type *last = NULL;
lang_output_section_statement_type *last_alloc = NULL;
lang_output_section_statement_type *last_ro_alloc = NULL;
lang_output_section_statement_type *last_rel = NULL;
lang_output_section_statement_type *last_rel_alloc = NULL;
int rela = sec->name[4] == 'a';
for (lookup = &lang_output_section_statement.head->output_section_statement;
lookup != NULL;
lookup = lookup->next)
{
if (lookup->constraint >= 0
&& CONST_STRNEQ (lookup->name, ".rel"))
{
int lookrela = lookup->name[4] == 'a';
/* .rel.dyn must come before all other reloc sections, to suit
GNU ld.so. */
if (isdyn)
break;
/* Don't place after .rel.plt as doing so results in wrong
dynamic tags. */
if (strcmp (".plt", lookup->name + 4 + lookrela) == 0)
break;
if (rela == lookrela || last_rel == NULL)
last_rel = lookup;
if ((rela == lookrela || last_rel_alloc == NULL)
&& lookup->bfd_section != NULL
&& (lookup->bfd_section->flags & SEC_ALLOC) != 0)
last_rel_alloc = lookup;
}
last = lookup;
if (lookup->bfd_section != NULL
&& (lookup->bfd_section->flags & SEC_ALLOC) != 0)
{
last_alloc = lookup;
if ((lookup->bfd_section->flags & SEC_READONLY) != 0)
last_ro_alloc = lookup;
}
}
if (last_rel_alloc)
return last_rel_alloc;
if (last_rel)
return last_rel;
if (last_ro_alloc)
return last_ro_alloc;
if (last_alloc)
return last_alloc;
return last;
}
/* Place an orphan section. We use this to put random SHF_ALLOC
sections in the right segment. */
static bfd_boolean
gld${EMULATION_NAME}_place_orphan (asection *s,
const char *secname,
int constraint)
{
static struct orphan_save hold[] =
{
{ ".text",
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
0, 0, 0, 0 },
{ ".rodata",
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
0, 0, 0, 0 },
{ ".data",
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA,
0, 0, 0, 0 },
{ ".bss",
SEC_ALLOC,
0, 0, 0, 0 },
{ 0,
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
0, 0, 0, 0 },
{ ".interp",
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
0, 0, 0, 0 },
{ ".sdata",
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_SMALL_DATA,
0, 0, 0, 0 }
};
enum orphan_save_index
{
orphan_text = 0,
orphan_rodata,
orphan_data,
orphan_bss,
orphan_rel,
orphan_interp,
orphan_sdata
};
static int orphan_init_done = 0;
struct orphan_save *place;
lang_output_section_statement_type *after;
lang_output_section_statement_type *os;
int isdyn = 0;
int iself = s->owner->xvec->flavour == bfd_target_elf_flavour;
unsigned int sh_type = iself ? elf_section_type (s) : SHT_NULL;
if (! link_info.relocatable
&& link_info.combreloc
&& (s->flags & SEC_ALLOC))
{
if (iself)
switch (sh_type)
{
case SHT_RELA:
secname = ".rela.dyn";
isdyn = 1;
break;
case SHT_REL:
secname = ".rel.dyn";
isdyn = 1;
break;
default:
break;
}
else if (CONST_STRNEQ (secname, ".rel"))
{
secname = secname[4] == 'a' ? ".rela.dyn" : ".rel.dyn";
isdyn = 1;
}
}
/* Look through the script to see where to place this section. */
if (constraint == 0
&& (os = lang_output_section_find (secname)) != NULL
&& os->bfd_section != NULL
&& (os->bfd_section->flags == 0
|| (_bfd_elf_match_sections_by_type (link_info.output_bfd,
os->bfd_section, s->owner, s)
&& ((s->flags ^ os->bfd_section->flags)
& (SEC_LOAD | SEC_ALLOC)) == 0)))
{
/* We already have an output section statement with this
name, and its bfd section has compatible flags.
If the section already exists but does not have any flags
set, then it has been created by the linker, probably as a
result of a --section-start command line switch. */
lang_add_section (&os->children, s, os);
return TRUE;
}
if (!orphan_init_done)
{
struct orphan_save *ho;
for (ho = hold; ho < hold + sizeof (hold) / sizeof (hold[0]); ++ho)
if (ho->name != NULL)
{
ho->os = lang_output_section_find (ho->name);
if (ho->os != NULL && ho->os->flags == 0)
ho->os->flags = ho->flags;
}
orphan_init_done = 1;
}
/* 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.executable
&& ! link_info.relocatable
&& CONST_STRNEQ (s->name, ".gnu.warning.")
&& hold[orphan_text].os != NULL)
{
lang_add_section (&hold[orphan_text].os->children, s,
hold[orphan_text].os);
return TRUE;
}
/* Decide which segment the section should go in based on the
section name and section flags. We put loadable .note sections
right after the .interp section, so that the PT_NOTE segment is
stored right after the program headers where the OS can read it
in the first page. */
place = NULL;
if ((s->flags & SEC_ALLOC) == 0)
;
else if ((s->flags & SEC_LOAD) != 0
&& ((iself && sh_type == SHT_NOTE)
|| (!iself && CONST_STRNEQ (secname, ".note"))))
place = &hold[orphan_interp];
else if ((s->flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0)
place = &hold[orphan_bss];
else if ((s->flags & SEC_SMALL_DATA) != 0)
place = &hold[orphan_sdata];
else if ((s->flags & SEC_READONLY) == 0)
place = &hold[orphan_data];
else if (((iself && (sh_type == SHT_RELA || sh_type == SHT_REL))
|| (!iself && CONST_STRNEQ (secname, ".rel")))
&& (s->flags & SEC_LOAD) != 0)
place = &hold[orphan_rel];
else if ((s->flags & SEC_CODE) == 0)
place = &hold[orphan_rodata];
else
place = &hold[orphan_text];
after = NULL;
if (place != NULL)
{
if (place->os == NULL)
{
if (place->name != NULL)
place->os = lang_output_section_find (place->name);
else
place->os = output_rel_find (s, isdyn);
}
after = place->os;
if (after == NULL)
after = lang_output_section_find_by_flags
(s, &place->os, _bfd_elf_match_sections_by_type);
if (after == NULL)
/* *ABS* is always the first output section statement. */
after = &lang_output_section_statement.head->output_section_statement;
}
lang_insert_orphan (s, secname, constraint, after, place, NULL, NULL);
return TRUE;
}
EOF
fi
if test x"$LDEMUL_FINISH" != xgld"$EMULATION_NAME"_finish; then
fragment <<EOF
static void
gld${EMULATION_NAME}_finish (void)
{
bfd_boolean need_layout = bfd_elf_discard_info (link_info.output_bfd,
&link_info);
gld${EMULATION_NAME}_map_segments (need_layout);
finish_default ();
}
EOF
fi
if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then
fragment <<EOF
static char *
gld${EMULATION_NAME}_get_script (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"
fragment <<EOF
{
*isfile = 0;
if (link_info.relocatable && config.build_constructors)
return
EOF
sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
echo ' ; else if (link_info.relocatable) return' >> e${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${EMULATION_NAME}.c
if cmp -s ldscripts/${EMULATION_NAME}.x ldscripts/${EMULATION_NAME}.xn; then : ; else
echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
fi
if test -n "$GENERATE_PIE_SCRIPT" ; then
if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
echo ' ; else if (link_info.pie && link_info.combreloc' >> e${EMULATION_NAME}.c
echo ' && link_info.relro' >> e${EMULATION_NAME}.c
echo ' && (link_info.flags & DF_BIND_NOW)) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xdw >> e${EMULATION_NAME}.c
echo ' ; else if (link_info.pie && link_info.combreloc) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xdc >> e${EMULATION_NAME}.c
fi
echo ' ; else if (link_info.pie) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xd >> e${EMULATION_NAME}.c
fi
if test -n "$GENERATE_SHLIB_SCRIPT" ; then
if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
echo ' ; else if (link_info.shared && link_info.combreloc' >> e${EMULATION_NAME}.c
echo ' && link_info.relro' >> e${EMULATION_NAME}.c
echo ' && (link_info.flags & DF_BIND_NOW)) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xsw >> e${EMULATION_NAME}.c
echo ' ; else if (link_info.shared && link_info.combreloc) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xsc >> e${EMULATION_NAME}.c
fi
echo ' ; else if (link_info.shared) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xs >> e${EMULATION_NAME}.c
fi
if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
echo ' ; else if (link_info.combreloc && link_info.relro' >> e${EMULATION_NAME}.c
echo ' && (link_info.flags & DF_BIND_NOW)) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xw >> e${EMULATION_NAME}.c
echo ' ; else if (link_info.combreloc) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xc >> 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.
fragment <<EOF
{
*isfile = 1;
if (link_info.relocatable && config.build_constructors)
return "ldscripts/${EMULATION_NAME}.xu";
else if (link_info.relocatable)
return "ldscripts/${EMULATION_NAME}.xr";
else if (!config.text_read_only)
return "ldscripts/${EMULATION_NAME}.xbn";
EOF
if cmp -s ldscripts/${EMULATION_NAME}.x ldscripts/${EMULATION_NAME}.xn; then :
else
fragment <<EOF
else if (!config.magic_demand_paged)
return "ldscripts/${EMULATION_NAME}.xn";
EOF
fi
if test -n "$GENERATE_PIE_SCRIPT" ; then
if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
fragment <<EOF
else if (link_info.pie && link_info.combreloc
&& link_info.relro && (link_info.flags & DF_BIND_NOW))
return "ldscripts/${EMULATION_NAME}.xdw";
else if (link_info.pie && link_info.combreloc)
return "ldscripts/${EMULATION_NAME}.xdc";
EOF
fi
fragment <<EOF
else if (link_info.pie)
return "ldscripts/${EMULATION_NAME}.xd";
EOF
fi
if test -n "$GENERATE_SHLIB_SCRIPT" ; then
if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
fragment <<EOF
else if (link_info.shared && link_info.combreloc
&& link_info.relro && (link_info.flags & DF_BIND_NOW))
return "ldscripts/${EMULATION_NAME}.xsw";
else if (link_info.shared && link_info.combreloc)
return "ldscripts/${EMULATION_NAME}.xsc";
EOF
fi
fragment <<EOF
else if (link_info.shared)
return "ldscripts/${EMULATION_NAME}.xs";
EOF
fi
if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
fragment <<EOF
else if (link_info.combreloc && link_info.relro
&& (link_info.flags & DF_BIND_NOW))
return "ldscripts/${EMULATION_NAME}.xw";
else if (link_info.combreloc)
return "ldscripts/${EMULATION_NAME}.xc";
EOF
fi
fragment <<EOF
else
return "ldscripts/${EMULATION_NAME}.x";
}
EOF
fi
fi
if test -n "$PARSE_AND_LIST_ARGS_CASES" -o x"$GENERATE_SHLIB_SCRIPT" = xyes; then
if test -n "$PARSE_AND_LIST_PROLOGUE" ; then
fragment <<EOF
$PARSE_AND_LIST_PROLOGUE
EOF
fi
fragment <<EOF
#define OPTION_DISABLE_NEW_DTAGS (400)
#define OPTION_ENABLE_NEW_DTAGS (OPTION_DISABLE_NEW_DTAGS + 1)
#define OPTION_GROUP (OPTION_ENABLE_NEW_DTAGS + 1)
#define OPTION_EH_FRAME_HDR (OPTION_GROUP + 1)
#define OPTION_EXCLUDE_LIBS (OPTION_EH_FRAME_HDR + 1)
#define OPTION_HASH_STYLE (OPTION_EXCLUDE_LIBS + 1)
#define OPTION_BUILD_ID (OPTION_HASH_STYLE + 1)
static void
gld${EMULATION_NAME}_add_options
(int ns, char **shortopts, int nl, struct option **longopts,
int nrl ATTRIBUTE_UNUSED, struct option **really_longopts ATTRIBUTE_UNUSED)
{
static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:";
static const struct option xtra_long[] = {
{"build-id", optional_argument, NULL, OPTION_BUILD_ID},
EOF
if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
fragment <<EOF
{"disable-new-dtags", no_argument, NULL, OPTION_DISABLE_NEW_DTAGS},
{"enable-new-dtags", no_argument, NULL, OPTION_ENABLE_NEW_DTAGS},
{"eh-frame-hdr", no_argument, NULL, OPTION_EH_FRAME_HDR},
{"exclude-libs", required_argument, NULL, OPTION_EXCLUDE_LIBS},
{"hash-style", required_argument, NULL, OPTION_HASH_STYLE},
{"Bgroup", no_argument, NULL, OPTION_GROUP},
EOF
fi
if test -n "$PARSE_AND_LIST_LONGOPTS" ; then
fragment <<EOF
$PARSE_AND_LIST_LONGOPTS
EOF
fi
fragment <<EOF
{NULL, no_argument, NULL, 0}
};
*shortopts = (char *) xrealloc (*shortopts, ns + sizeof (xtra_short));
memcpy (*shortopts + ns, &xtra_short, sizeof (xtra_short));
*longopts = (struct option *)
xrealloc (*longopts, nl * sizeof (struct option) + sizeof (xtra_long));
memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
}
#define DEFAULT_BUILD_ID_STYLE "sha1"
static bfd_boolean
gld${EMULATION_NAME}_handle_option (int optc)
{
switch (optc)
{
default:
return FALSE;
case OPTION_BUILD_ID:
if (link_info.emit_note_gnu_build_id != NULL)
{
free (link_info.emit_note_gnu_build_id);
link_info.emit_note_gnu_build_id = NULL;
}
if (optarg == NULL)
optarg = DEFAULT_BUILD_ID_STYLE;
if (strcmp (optarg, "none"))
link_info.emit_note_gnu_build_id = xstrdup (optarg);
break;
EOF
if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
fragment <<EOF
case OPTION_DISABLE_NEW_DTAGS:
link_info.new_dtags = FALSE;
break;
case OPTION_ENABLE_NEW_DTAGS:
link_info.new_dtags = TRUE;
break;
case OPTION_EH_FRAME_HDR:
link_info.eh_frame_hdr = TRUE;
break;
case OPTION_GROUP:
link_info.flags_1 |= (bfd_vma) DF_1_GROUP;
/* Groups must be self-contained. */
link_info.unresolved_syms_in_objects = RM_GENERATE_ERROR;
link_info.unresolved_syms_in_shared_libs = RM_GENERATE_ERROR;
break;
case OPTION_EXCLUDE_LIBS:
add_excluded_libs (optarg);
break;
case OPTION_HASH_STYLE:
link_info.emit_hash = FALSE;
link_info.emit_gnu_hash = FALSE;
if (strcmp (optarg, "sysv") == 0)
link_info.emit_hash = TRUE;
else if (strcmp (optarg, "gnu") == 0)
link_info.emit_gnu_hash = TRUE;
else if (strcmp (optarg, "both") == 0)
{
link_info.emit_hash = TRUE;
link_info.emit_gnu_hash = TRUE;
}
else
einfo (_("%P%F: invalid hash style \`%s'\n"), optarg);
break;
case 'z':
if (strcmp (optarg, "initfirst") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_INITFIRST;
else if (strcmp (optarg, "interpose") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_INTERPOSE;
else if (strcmp (optarg, "loadfltr") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_LOADFLTR;
else if (strcmp (optarg, "nodefaultlib") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_NODEFLIB;
else if (strcmp (optarg, "nodelete") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_NODELETE;
else if (strcmp (optarg, "nodlopen") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_NOOPEN;
else if (strcmp (optarg, "nodump") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_NODUMP;
else if (strcmp (optarg, "now") == 0)
{
link_info.flags |= (bfd_vma) DF_BIND_NOW;
link_info.flags_1 |= (bfd_vma) DF_1_NOW;
}
else if (strcmp (optarg, "lazy") == 0)
{
link_info.flags &= ~(bfd_vma) DF_BIND_NOW;
link_info.flags_1 &= ~(bfd_vma) DF_1_NOW;
}
else if (strcmp (optarg, "origin") == 0)
{
link_info.flags |= (bfd_vma) DF_ORIGIN;
link_info.flags_1 |= (bfd_vma) DF_1_ORIGIN;
}
else if (strcmp (optarg, "defs") == 0)
link_info.unresolved_syms_in_objects = RM_GENERATE_ERROR;
else if (strcmp (optarg, "muldefs") == 0)
link_info.allow_multiple_definition = TRUE;
else if (strcmp (optarg, "combreloc") == 0)
link_info.combreloc = TRUE;
else if (strcmp (optarg, "nocombreloc") == 0)
link_info.combreloc = FALSE;
else if (strcmp (optarg, "nocopyreloc") == 0)
link_info.nocopyreloc = TRUE;
else if (strcmp (optarg, "execstack") == 0)
{
link_info.execstack = TRUE;
link_info.noexecstack = FALSE;
}
else if (strcmp (optarg, "noexecstack") == 0)
{
link_info.noexecstack = TRUE;
link_info.execstack = FALSE;
}
EOF
if test -n "$COMMONPAGESIZE"; then
fragment <<EOF
else if (strcmp (optarg, "relro") == 0)
link_info.relro = TRUE;
else if (strcmp (optarg, "norelro") == 0)
link_info.relro = FALSE;
EOF
fi
fragment <<EOF
else if (CONST_STRNEQ (optarg, "max-page-size="))
{
char *end;
config.maxpagesize = strtoul (optarg + 14, &end, 0);
if (*end || (config.maxpagesize & (config.maxpagesize - 1)) != 0)
einfo (_("%P%F: invalid maxium page size \`%s'\n"),
optarg + 14);
ASSERT (default_target != NULL);
bfd_emul_set_maxpagesize (default_target, config.maxpagesize);
}
else if (CONST_STRNEQ (optarg, "common-page-size="))
{
char *end;
config.commonpagesize = strtoul (optarg + 17, &end, 0);
if (*end
|| (config.commonpagesize & (config.commonpagesize - 1)) != 0)
einfo (_("%P%F: invalid common page size \`%s'\n"),
optarg + 17);
ASSERT (default_target != NULL);
bfd_emul_set_commonpagesize (default_target,
config.commonpagesize);
}
/* What about the other Solaris -z options? FIXME. */
break;
EOF
fi
if test -n "$PARSE_AND_LIST_ARGS_CASES" ; then
fragment <<EOF
$PARSE_AND_LIST_ARGS_CASES
EOF
fi
fragment <<EOF
}
return TRUE;
}
EOF
if test x"$LDEMUL_LIST_OPTIONS" != xgld"$EMULATION_NAME"_list_options; then
fragment <<EOF
static void
gld${EMULATION_NAME}_list_options (FILE * file)
{
fprintf (file, _("\
--build-id[=STYLE] Generate build ID note\n"));
EOF
if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
fragment <<EOF
fprintf (file, _("\
-Bgroup Selects group name lookup rules for DSO\n"));
fprintf (file, _("\
--disable-new-dtags Disable new dynamic tags\n"));
fprintf (file, _("\
--enable-new-dtags Enable new dynamic tags\n"));
fprintf (file, _("\
--eh-frame-hdr Create .eh_frame_hdr section\n"));
fprintf (file, _("\
--hash-style=STYLE Set hash style to sysv, gnu or both\n"));
fprintf (file, _("\
-z combreloc Merge dynamic relocs into one section and sort\n"));
fprintf (file, _("\
-z defs Report unresolved symbols in object files.\n"));
fprintf (file, _("\
-z execstack Mark executable as requiring executable stack\n"));
fprintf (file, _("\
-z initfirst Mark DSO to be initialized first at runtime\n"));
fprintf (file, _("\
-z interpose Mark object to interpose all DSOs but executable\n"));
fprintf (file, _("\
-z lazy Mark object lazy runtime binding (default)\n"));
fprintf (file, _("\
-z loadfltr Mark object requiring immediate process\n"));
fprintf (file, _("\
-z muldefs Allow multiple definitions\n"));
fprintf (file, _("\
-z nocombreloc Don't merge dynamic relocs into one section\n"));
fprintf (file, _("\
-z nocopyreloc Don't create copy relocs\n"));
fprintf (file, _("\
-z nodefaultlib Mark object not to use default search paths\n"));
fprintf (file, _("\
-z nodelete Mark DSO non-deletable at runtime\n"));
fprintf (file, _("\
-z nodlopen Mark DSO not available to dlopen\n"));
fprintf (file, _("\
-z nodump Mark DSO not available to dldump\n"));
fprintf (file, _("\
-z noexecstack Mark executable as not requiring executable stack\n"));
EOF
if test -n "$COMMONPAGESIZE"; then
fragment <<EOF
fprintf (file, _("\
-z norelro Don't create RELRO program header\n"));
EOF
fi
fragment <<EOF
fprintf (file, _("\
-z now Mark object non-lazy runtime binding\n"));
fprintf (file, _("\
-z origin Mark object requiring immediate \$ORIGIN\n\
processing at runtime\n"));
EOF
if test -n "$COMMONPAGESIZE"; then
fragment <<EOF
fprintf (file, _("\
-z relro Create RELRO program header\n"));
EOF
fi
fragment <<EOF
fprintf (file, _("\
-z max-page-size=SIZE Set maximum page size to SIZE\n"));
fprintf (file, _("\
-z common-page-size=SIZE Set common page size to SIZE\n"));
fprintf (file, _("\
-z KEYWORD Ignored for Solaris compatibility\n"));
EOF
fi
if test -n "$PARSE_AND_LIST_OPTIONS" ; then
fragment <<EOF
$PARSE_AND_LIST_OPTIONS
EOF
fi
fragment <<EOF
}
EOF
if test -n "$PARSE_AND_LIST_EPILOGUE" ; then
fragment <<EOF
$PARSE_AND_LIST_EPILOGUE
EOF
fi
fi
else
fragment <<EOF
#define gld${EMULATION_NAME}_add_options NULL
#define gld${EMULATION_NAME}_handle_option NULL
EOF
if test x"$LDEMUL_LIST_OPTIONS" != xgld"$EMULATION_NAME"_list_options; then
fragment <<EOF
#define gld${EMULATION_NAME}_list_options NULL
EOF
fi
fi
fragment <<EOF
struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
{
${LDEMUL_BEFORE_PARSE-gld${EMULATION_NAME}_before_parse},
${LDEMUL_SYSLIB-syslib_default},
${LDEMUL_HLL-hll_default},
${LDEMUL_AFTER_PARSE-after_parse_default},
${LDEMUL_AFTER_OPEN-gld${EMULATION_NAME}_after_open},
${LDEMUL_AFTER_ALLOCATION-after_allocation_default},
${LDEMUL_SET_OUTPUT_ARCH-set_output_arch_default},
${LDEMUL_CHOOSE_TARGET-ldemul_default_target},
${LDEMUL_BEFORE_ALLOCATION-gld${EMULATION_NAME}_before_allocation},
${LDEMUL_GET_SCRIPT-gld${EMULATION_NAME}_get_script},
"${EMULATION_NAME}",
"${OUTPUT_FORMAT}",
${LDEMUL_FINISH-gld${EMULATION_NAME}_finish},
${LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS-NULL},
${LDEMUL_OPEN_DYNAMIC_ARCHIVE-gld${EMULATION_NAME}_open_dynamic_archive},
${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan},
${LDEMUL_SET_SYMBOLS-NULL},
${LDEMUL_PARSE_ARGS-NULL},
gld${EMULATION_NAME}_add_options,
gld${EMULATION_NAME}_handle_option,
${LDEMUL_UNRECOGNIZED_FILE-NULL},
${LDEMUL_LIST_OPTIONS-gld${EMULATION_NAME}_list_options},
${LDEMUL_RECOGNIZED_FILE-gld${EMULATION_NAME}_load_symbols},
${LDEMUL_FIND_POTENTIAL_LIBRARIES-NULL},
${LDEMUL_NEW_VERS_PATTERN-NULL}
};
EOF
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