+2003-05-30 Ulrich Drepper <drepper@redhat.com>
+ Jakub Jelinek <jakub@redhat.com>
+
+ * elflink.h (elf_link_add_object_symbols): Use !info->executable
+ instead of info->shared where appropriate.
+ (bfd_elfNN_size_dynamic_sections, elf_link_output_extsym): Likewise.
+ * elflink.c (_bfd_elf_create_got_section): Likewise.
+ (_bfd_elf_link_create_dynamic_sections): Likewise.
+ (_bfd_elf_link_assign_sym_version): Likewise.
+ * elf32-i386.c (elf_i386_size_dynamic_sections): Create .interp section
+ and DT_DEBUG dynamic tag even for position independent executables.
+ * elf32-ppc.c (ppc_elf_size_dynamic_sections): Likewise.
+ * elf32-s390.c (elf_s390_size_dynamic_sections: Likewise.
+ * elf64-ppc.c (ppc64_elf_size_dynamic_sections: Likewise.
+ * elf64-s390.c (elf_s390_size_dynamic_sections: Likewise.
+ * elf64-x86-64.c (elf64_x86_64_size_dynamic_sections: Likewise.
+ * elfxx-ia64.c (elfNN_ia64_size_dynamic_sections: Likewise.
+ * elf32-sparc.c (elf32_sparc_size_dynamic_sections: Likewise.
+ * elf64-alpha.c (elf64_alpha_size_dynamic_sections: Likewise.
+ * elf64-sparc.c (sparc64_elf_size_dynamic_sections: Likewise.
+
2003-05-30 Kris Warkentin <kewarken@qnx.com>
* elf.c (elfcore_grok_nto_status): Only set lwpid for the active or
if (htab->elf.dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
if (s == NULL)
#define add_dynamic_entry(TAG, VAL) \
bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (! info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (elf_hash_table (info)->dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (htab->elf.dynobj, ".interp");
BFD_ASSERT (s != NULL);
#define add_dynamic_entry(TAG, VAL) \
bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (!info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (htab->elf.dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
if (s == NULL)
#define add_dynamic_entry(TAG, VAL) \
bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (! info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (elf_hash_table (info)->dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
#define add_dynamic_entry(TAG, VAL) \
bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (!info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (elf_hash_table (info)->dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (!info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
#define add_dynamic_entry(TAG, VAL) \
bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (!info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (htab->elf.dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
if (s == NULL)
#define add_dynamic_entry(TAG, VAL) \
bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (!info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (htab->elf.dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
if (s == NULL)
#define add_dynamic_entry(TAG, VAL) \
bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (! info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (elf_hash_table (info)->dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
struct elf_strtab_hash *dynstr;
struct elf_link_hash_table *eht = elf_hash_table (info);
- if (!info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (htab->elf.dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
if (s == NULL)
#define add_dynamic_entry(TAG, VAL) \
bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
- if (! info->shared)
+ if (info->executable)
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
h->type = STT_OBJECT;
- if (info->shared
+ if (! info->executable
&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
/* A dynamically linked executable has a .interp section, but a
shared library does not. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_make_section (abfd, ".interp");
if (s == NULL
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
h->type = STT_OBJECT;
- if (info->shared
+ if (! info->executable
&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
h->type = STT_OBJECT;
- if (info->shared
+ if (! info->executable
&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
/* If we are building an application, we need to create a
version node for this version. */
- if (t == NULL && ! info->shared)
+ if (t == NULL && info->executable)
{
struct bfd_elf_version_tree **pp;
int version_index;
.gnu.warning.SYMBOL are treated as warning symbols for the given
symbol. This differs from .gnu.warning sections, which generate
warnings when they are included in an output file. */
- if (! info->shared)
+ if (info->executable)
{
asection *s;
}
else
new_flag = ELF_LINK_HASH_DEF_REGULAR;
- if (info->shared
+ if (! info->executable
|| (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
| ELF_LINK_HASH_REF_DYNAMIC)) != 0)
dynsym = TRUE;
if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
{
/* DT_PREINIT_ARRAY is not allowed in shared library. */
- if (info->shared)
+ if (! info->executable)
{
bfd *sub;
asection *o;
if (info->flags_1)
{
- if (! info->shared)
+ if (info->executable)
info->flags_1 &= ~ (DF_1_INITFIRST
| DF_1_NODELETE
| DF_1_NOOPEN);
referenced by regular files, because we will already have issued
warnings for them. */
if (! finfo->info->relocateable
- && (! finfo->info->shared || ! finfo->info->allow_shlib_undefined)
+ && (finfo->info->executable
+ || ! finfo->info->allow_shlib_undefined)
&& h->root.type == bfd_link_hash_undefined
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
/* Set the contents of the .interp section to the interpreter. */
if (ia64_info->root.dynamic_sections_created
- && !info->shared)
+ && info->executable)
{
sec = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (sec != NULL);
later (in finish_dynamic_sections) but we must add the entries now
so that we get the correct size for the .dynamic section. */
- if (!info->shared)
+ if (info->executable)
{
/* The DT_DEBUG entry is filled in by the dynamic linker and used
by the debugger. */
+2003-05-30 Ulrich Drepper <drepper@redhat.com>
+ Jakub Jelinek <jakub@redhat.com>
+
+ * bfdlink.h (struct bfd_link_info): Add pie and executable
+ bits.
+
2003-05-21 Nick Clifton <nickc@redhat.com>
* bfdlink.h (struct bfd_link_hash_table): Fix typo in comment.
/* TRUE if relaxation is being finalized. */
unsigned int relax_finalizing: 1;
+ /* TRUE if generating a position independent executable. */
+ unsigned int pie: 1;
+
+ /* TRUE if generating an executable, position independent or not. */
+ unsigned int executable : 1;
+
/* Which symbols to strip. */
enum bfd_link_strip strip;
+2003-05-30 Ulrich Drepper <drepper@redhat.com>
+ Jakub Jelinek <jakub@redhat.com>
+
+ * lexsup.c (OPTION_PIE): Define.
+ (ld_options): Add -pie and --pic-executable options.
+ (parse_args): Handle OPTION_PIE.
+ * ldmain.c (main): Initialize link_info.pie and
+ link_info.executable.
+ * genscripts.sh: Generate PIE scripts.
+ * ld.texinfo: Document -pie and --pic-executable options.
+ * emultempl/elf32.em (gld${EMULATION_NAME}_after_open):
+ (gld${EMULATION_NAME}_place_orphan): Likewise.
+ (gld${EMULATION_NAME}_get_script): Include PIE scripts.
+ * scripttempl/elf.sc: In PIE scripts set . the same way as in
+ shared scripts.
+ * emulparams/elf_i386.sh (GENERATE_PIE_SCRIPT): Set to yes.
+ * emulparams/elf64_ia64.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf32ppc.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf64ppc.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf_x86_64.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf_s390.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf32_sparc.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf64_sparc.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf64alpha.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf64_s390.sh (GENERATE_PIE_SCRIPT): Likewise.
+ * emulparams/elf_i386.sh (GENERATE_PIE_SCRIPT): Likewise.
+
2003-05-30 H.J. Lu <hongjiu.lu@intel.com>
* genscripts.sh: Create tmpdir/libpath.exp.
TEMPLATE_NAME=elf32
DATA_PLT=
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
NO_SMALL_DATA=yes
TEMPLATE_NAME=elf32
EXTRA_EM_FILE=ppc32elf
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
SCRIPT_NAME=elf
OUTPUT_FORMAT="elf32-powerpc"
TEXT_START_ADDR=0x01800000
TEXT_START_ADDR="0x4000000000000000"
DATA_ADDR="0x6000000000000000 + (. & (${MAXPAGESIZE} - 1))"
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
NOP=0x00300000010070000002000001000400 # a bundle full of nops
OTHER_GOT_SECTIONS="
.IA_64.pltoff ${RELOCATING-0} : { *(.IA_64.pltoff) }"
NOP=0x07070707
TEMPLATE_NAME=elf32
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
# Treat a host that matches the target with the possible exception of "x"
# in the name as if it were native.
MACHINE=
DATA_PLT=
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
NOP=0x01000000
NO_SMALL_DATA=yes
ARCH=alpha
MACHINE=
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
DATA_PLT=
# Note that the number is always big-endian, thus we have to
# reverse the digit string.
EXTRA_EM_FILE=ppc64elf
ELFSIZE=64
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
SCRIPT_NAME=elf
OUTPUT_FORMAT="elf64-powerpc"
TEXT_START_ADDR=0x10000000
NOP=0x90909090
TEMPLATE_NAME=elf32
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
NO_SMALL_DATA=yes
NOP=0x07070707
TEMPLATE_NAME=elf32
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
NOP=0x90909090
TEMPLATE_NAME=elf32
GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
NO_SMALL_DATA=yes
if [ "x${host}" = "x${target}" ]; then
struct bfd_link_needed_list *needed, *l;
/* We only need to worry about this when doing a final link. */
- if (link_info.relocateable || link_info.shared)
+ if (link_info.relocateable || !link_info.executable)
return;
/* Get the list of files which appear in DT_NEEDED entries in
/* If this is a final link, then always put .gnu.warning.SYMBOL
sections into the .text section to get them out of the way. */
- if (! link_info.shared
+ if (link_info.executable
&& ! link_info.relocateable
&& strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0
&& hold_text.os != NULL)
echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
fi
+if test -n "$GENERATE_PIE_SCRIPT" ; then
+if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
+echo ' ; else if (link_info.pie && link_info.combreloc) return' >> e${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 "$GENERATE_COMBRELOC_SCRIPT" ; then
echo ' ; else if (link_info.shared && link_info.combreloc) return' >> e${EMULATION_NAME}.c
return "ldscripts/${EMULATION_NAME}.xn";
EOF
fi
+if test -n "$GENERATE_PIE_SCRIPT" ; then
+if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
+cat >>e${EMULATION_NAME}.c <<EOF
+ else if (link_info.pie && link_info.combreloc)
+ return "ldscripts/${EMULATION_NAME}.xdc";
+EOF
+fi
+cat >>e${EMULATION_NAME}.c <<EOF
+ else if (link_info.pie)
+ return "ldscripts/${EMULATION_NAME}.xd";
+EOF
+fi
if test -n "$GENERATE_SHLIB_SCRIPT" ; then
if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
cat >>e${EMULATION_NAME}.c <<EOF
rm -f ${COMBRELOC}
COMBRELOC=
fi
+ unset CREATE_SHLIB
+fi
+
+if test -n "$GENERATE_PIE_SCRIPT"; then
+ LD_FLAG=pie
+ DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
+ CREATE_PIE=" "
+ # Note that TEXT_START_ADDR is set to NONPAGED_TEXT_START_ADDR.
+ (
+ echo "/* Script for ld -pie: link position independent executable */"
+ . ${srcdir}/emulparams/${EMULATION_NAME}.sh
+ . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+ ) | sed -e '/^ *$/d;s/[ ]*$//' > ldscripts/${EMULATION_NAME}.xd
+ if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
+ LD_FLAG=cpie
+ DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
+ COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
+ ( echo "/* Script for -pie -z combreloc: position independent executable, combine & sort relocs */"
+ . ${srcdir}/emulparams/${EMULATION_NAME}.sh
+ . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+ ) | sed -e '/^ *$/d;s/[ ]*$//' > ldscripts/${EMULATION_NAME}.xdc
+ rm -f ${COMBRELOC}
+ COMBRELOC=
+ fi
+ unset CREATE_PIE
fi
case " $EMULATION_LIBPATH " in
this option overrides it. @xref{BFD}.
@end ifclear
+@kindex -pie
+@kindex --pic-executable
+@item -pie
+@itemx --pic-executable
+@cindex position independent executables
+Create a position independent executable. This is currently only supported on
+ELF platforms. Position independent executables are similar to shared
+libraries in that they are relocated by the dynamic linker to the virtual
+address OS chooses for them (which can varry between invocations), like
+normal dynamically linked executables they can be executed and symbols
+defined in the executable cannot be overridden by shared libraries.
+
@kindex -qmagic
@item -qmagic
This option is ignored for Linux compatibility.
link_info.emitrelocations = FALSE;
link_info.task_link = FALSE;
link_info.shared = FALSE;
+ link_info.pie = FALSE;
+ link_info.executable = FALSE;
link_info.symbolic = FALSE;
link_info.export_dynamic = FALSE;
link_info.static_link = FALSE;
einfo (_("%P%F: -f may not be used without -shared\n"));
}
+ if (! link_info.shared || link_info.pie)
+ link_info.executable = TRUE;
+
/* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
don't see how else this can be handled, since in this case we
must preserve all externally visible symbols. */
#define OPTION_NO_STRIP_DISCARDED (OPTION_STRIP_DISCARDED + 1)
#define OPTION_ACCEPT_UNKNOWN_INPUT_ARCH (OPTION_NO_STRIP_DISCARDED + 1)
#define OPTION_NO_ACCEPT_UNKNOWN_INPUT_ARCH (OPTION_ACCEPT_UNKNOWN_INPUT_ARCH + 1)
+#define OPTION_PIE (OPTION_NO_ACCEPT_UNKNOWN_INPUT_ARCH + 1)
/* The long options. This structure is used for both the option
parsing and the help text. */
'\0', NULL, N_("Create a shared library"), ONE_DASH },
{ {"Bshareable", no_argument, NULL, OPTION_SHARED }, /* FreeBSD. */
'\0', NULL, NULL, ONE_DASH },
+ { {"pie", no_argument, NULL, OPTION_PIE},
+ '\0', NULL, N_("Create a position independent executable"), ONE_DASH },
+ { {"pic-executable", no_argument, NULL, OPTION_PIE},
+ '\0', NULL, NULL, TWO_DASHES },
{ {"sort-common", no_argument, NULL, OPTION_SORT_COMMON},
'\0', NULL, N_("Sort common symbols by size"), TWO_DASHES },
{ {"sort_common", no_argument, NULL, OPTION_SORT_COMMON},
else
einfo (_("%P%F: -shared not supported\n"));
break;
+ case OPTION_PIE:
+ if (config.has_shared)
+ {
+ link_info.shared = TRUE;
+ link_info.pie = TRUE;
+ }
+ else
+ einfo (_("%P%F: -pie not supported\n"));
+ break;
case 'h': /* Used on Solaris. */
case OPTION_SONAME:
command_line.soname = optarg;
SECTIONS
{
/* Read-only sections, merged into text segment: */
- ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}}
+ ${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}}}
${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0} + SIZEOF_HEADERS;}}
+ ${CREATE_PIE+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0} + SIZEOF_HEADERS;}}
${CREATE_SHLIB-${INTERP}}
${INITIAL_READONLY_SECTIONS}
${TEXT_DYNAMIC+${DYNAMIC}}
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