ld -z options
Alan Modra
amodra@gmail.com
Thu Jul 14 03:29:00 GMT 2011
On Wed, Jul 13, 2011 at 04:07:35PM -0700, Ian Lance Taylor wrote:
> Alan Modra <amodra@gmail.com> writes:
>
> > I found today that none of the ld -z options are available on ELF
> > targets that lack shared lib support (unless the target happens to
> > provide some target specific options, which is weird). This patch
> > rearranges the option support code in elf32.em to make a few useful
> > options generally available, and moves a couple of x86/x86_64 options
> > out of the general set. I'll commit this after running tests
> > overnight.
>
> While you're looking at this, how would you feel about making the linker
> give a warning or error when an unrecognized -z option is used?
Done. A warning seems reasonable. I've also taken out the
"-z KEYWORD Ignored for Solaris compatibility" help message, and moved
emultempl/plt_unwind.em to emulparams/plt_unwind.sh so that it doesn't
conflict with other uses of EXTRA_EM_FILE.
* emultempl/elf32.em (gld${EMULATION_NAME}_add_options,
gld${EMULATION_NAME}_handle_option, gld${EMULATION_NAME}_list_options):
Provide --build-id, -z defs, -z muldefs, -z max-page-size,
-z common-page-size, -z execstack, -z noexecstack for all targets.
Add help for --exclude-libs.
(OPTION_LD_GENERATED_UNWIND_INFO,
OPTION_NO_LD_GENERATED_UNWIND_INFO): Move this..
(gld${EMULATION_NAME}_handle_option): ..and code handling
--ld-generated-unwind-info and --no-ld-generated-unwind-info..
* emulparams/plt_unwind.sh: ..to here. New file. Add help.
* emulparams/elf32_x86_64.sh: Include plt_unwind.sh.
* emulparams/elf_i386.sh: Likewise.
* emulparams/elf_i386_chaos.sh: Likewise.
* emulparams/elf_i386_ldso.sh: Likewise.
* emulparams/elf_l1om.sh: Likewise.
* emulparams/elf_x86_64.sh: Likewise.
Index: ld/emulparams/elf32_x86_64.sh
===================================================================
RCS file: /cvs/src/src/ld/emulparams/elf32_x86_64.sh,v
retrieving revision 1.2
diff -u -p -r1.2 elf32_x86_64.sh
--- ld/emulparams/elf32_x86_64.sh 16 Feb 2011 19:14:41 -0000 1.2
+++ ld/emulparams/elf32_x86_64.sh 14 Jul 2011 02:12:01 -0000
@@ -1,3 +1,4 @@
+. ${srcdir}/emulparams/plt_unwind.sh
SCRIPT_NAME=elf
ELFSIZE=32
OUTPUT_FORMAT="elf32-x86-64"
Index: ld/emulparams/elf_i386.sh
===================================================================
RCS file: /cvs/src/src/ld/emulparams/elf_i386.sh,v
retrieving revision 1.10
diff -u -p -r1.10 elf_i386.sh
--- ld/emulparams/elf_i386.sh 29 Jul 2009 14:59:23 -0000 1.10
+++ ld/emulparams/elf_i386.sh 14 Jul 2011 02:12:01 -0000
@@ -1,3 +1,4 @@
+. ${srcdir}/emulparams/plt_unwind.sh
SCRIPT_NAME=elf
OUTPUT_FORMAT="elf32-i386"
NO_RELA_RELOCS=yes
Index: ld/emulparams/elf_i386_chaos.sh
===================================================================
RCS file: /cvs/src/src/ld/emulparams/elf_i386_chaos.sh,v
retrieving revision 1.6
diff -u -p -r1.6 elf_i386_chaos.sh
--- ld/emulparams/elf_i386_chaos.sh 9 Aug 2007 11:02:24 -0000 1.6
+++ ld/emulparams/elf_i386_chaos.sh 14 Jul 2011 02:12:01 -0000
@@ -1,3 +1,4 @@
+. ${srcdir}/emulparams/plt_unwind.sh
SCRIPT_NAME=elf_chaos
OUTPUT_FORMAT="elf32-i386"
TEXT_START_ADDR=0x40000000
Index: ld/emulparams/elf_i386_ldso.sh
===================================================================
RCS file: /cvs/src/src/ld/emulparams/elf_i386_ldso.sh,v
retrieving revision 1.6
diff -u -p -r1.6 elf_i386_ldso.sh
--- ld/emulparams/elf_i386_ldso.sh 22 Oct 2008 05:20:44 -0000 1.6
+++ ld/emulparams/elf_i386_ldso.sh 14 Jul 2011 02:12:01 -0000
@@ -1,3 +1,4 @@
+. ${srcdir}/emulparams/plt_unwind.sh
SCRIPT_NAME=elf
OUTPUT_FORMAT="elf32-i386"
NO_RELA_RELOCS=yes
Index: ld/emulparams/elf_l1om.sh
===================================================================
RCS file: /cvs/src/src/ld/emulparams/elf_l1om.sh,v
retrieving revision 1.2
diff -u -p -r1.2 elf_l1om.sh
--- ld/emulparams/elf_l1om.sh 31 Mar 2011 22:23:09 -0000 1.2
+++ ld/emulparams/elf_l1om.sh 14 Jul 2011 02:12:01 -0000
@@ -1,3 +1,4 @@
+. ${srcdir}/emulparams/plt_unwind.sh
SCRIPT_NAME=elf
ELFSIZE=64
OUTPUT_FORMAT="elf64-l1om"
Index: ld/emulparams/elf_x86_64.sh
===================================================================
RCS file: /cvs/src/src/ld/emulparams/elf_x86_64.sh,v
retrieving revision 1.22
diff -u -p -r1.22 elf_x86_64.sh
--- ld/emulparams/elf_x86_64.sh 29 Jul 2009 14:59:23 -0000 1.22
+++ ld/emulparams/elf_x86_64.sh 14 Jul 2011 02:12:01 -0000
@@ -1,3 +1,4 @@
+. ${srcdir}/emulparams/plt_unwind.sh
SCRIPT_NAME=elf
ELFSIZE=64
OUTPUT_FORMAT="elf64-x86-64"
Index: ld/emulparams/plt_unwind.sh
===================================================================
RCS file: ld/emulparams/plt_unwind.sh
diff -N ld/emulparams/plt_unwind.sh
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ ld/emulparams/plt_unwind.sh 14 Jul 2011 02:34:57 -0000
@@ -0,0 +1,28 @@
+PARSE_AND_LIST_PROLOGUE='
+#define OPTION_LD_GENERATED_UNWIND_INFO 301
+#define OPTION_NO_LD_GENERATED_UNWIND_INFO 302
+'
+
+PARSE_AND_LIST_LONGOPTS='
+ {"ld-generated-unwind-info", no_argument, NULL,
+ OPTION_LD_GENERATED_UNWIND_INFO},
+ {"no-ld-generated-unwind-info", no_argument, NULL,
+ OPTION_NO_LD_GENERATED_UNWIND_INFO},
+'
+
+PARSE_AND_LIST_OPTIONS='
+ fprintf (file, _("\
+ --ld-generated-unwind-info Generate exception handling info for PLT.\n\
+ --no-ld-generated-unwind-info Don'\''t do so.\n"
+ ));
+'
+
+PARSE_AND_LIST_ARGS_CASES='
+ case OPTION_LD_GENERATED_UNWIND_INFO:
+ link_info.no_ld_generated_unwind_info = FALSE;
+ break;
+
+ case OPTION_NO_LD_GENERATED_UNWIND_INFO:
+ link_info.no_ld_generated_unwind_info = TRUE;
+ break;
+'
Index: ld/emultempl/elf32.em
===================================================================
RCS file: /cvs/src/src/ld/emultempl/elf32.em,v
retrieving revision 1.220
diff -u -p -r1.220 elf32.em
--- ld/emultempl/elf32.em 20 Jun 2011 13:18:48 -0000 1.220
+++ ld/emultempl/elf32.em 14 Jul 2011 02:12:02 -0000
@@ -2106,8 +2106,6 @@ EOF
fi
fi
-if test -n "$PARSE_AND_LIST_ARGS_CASES" -o x"$GENERATE_SHLIB_SCRIPT" = xyes; then
-
if test -n "$PARSE_AND_LIST_PROLOGUE" ; then
fragment <<EOF
$PARSE_AND_LIST_PROLOGUE
@@ -2124,42 +2122,49 @@ fragment <<EOF
#define OPTION_HASH_STYLE (OPTION_EXCLUDE_LIBS + 1)
#define OPTION_BUILD_ID (OPTION_HASH_STYLE + 1)
#define OPTION_AUDIT (OPTION_BUILD_ID + 1)
-#define OPTION_LD_GENERATED_UNWIND_INFO (OPTION_AUDIT + 1)
-#define OPTION_NO_LD_GENERATED_UNWIND_INFO (OPTION_LD_GENERATED_UNWIND_INFO + 1)
static void
gld${EMULATION_NAME}_add_options
(int ns, char **shortopts, int nl, struct option **longopts,
int nrl ATTRIBUTE_UNUSED, struct option **really_longopts ATTRIBUTE_UNUSED)
{
+EOF
+if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
+fragment <<EOF
static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:P:";
+EOF
+else
+fragment <<EOF
+ static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:";
+EOF
+fi
+fragment <<EOF
static const struct option xtra_long[] = {
- {"build-id", optional_argument, NULL, OPTION_BUILD_ID},
+EOF
+if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
+fragment <<EOF
{"audit", required_argument, NULL, OPTION_AUDIT},
- {"depaudit", required_argument, NULL, 'P'},
+ {"Bgroup", no_argument, NULL, OPTION_GROUP},
+EOF
+fi
+fragment <<EOF
+ {"build-id", optional_argument, NULL, OPTION_BUILD_ID},
EOF
-
if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
fragment <<EOF
+ {"depaudit", required_argument, NULL, 'P'},
{"disable-new-dtags", no_argument, NULL, OPTION_DISABLE_NEW_DTAGS},
{"enable-new-dtags", no_argument, NULL, OPTION_ENABLE_NEW_DTAGS},
{"eh-frame-hdr", no_argument, NULL, OPTION_EH_FRAME_HDR},
{"exclude-libs", required_argument, NULL, OPTION_EXCLUDE_LIBS},
{"hash-style", required_argument, NULL, OPTION_HASH_STYLE},
- {"ld-generated-unwind-info", no_argument, NULL,
- OPTION_LD_GENERATED_UNWIND_INFO},
- {"no-ld-generated-unwind-info", no_argument, NULL,
- OPTION_NO_LD_GENERATED_UNWIND_INFO},
- {"Bgroup", no_argument, NULL, OPTION_GROUP},
EOF
fi
-
if test -n "$PARSE_AND_LIST_LONGOPTS" ; then
fragment <<EOF
$PARSE_AND_LIST_LONGOPTS
EOF
fi
-
fragment <<EOF
{NULL, no_argument, NULL, 0}
};
@@ -2192,17 +2197,19 @@ gld${EMULATION_NAME}_handle_option (int
if (strcmp (optarg, "none"))
link_info.emit_note_gnu_build_id = xstrdup (optarg);
break;
+
+EOF
+
+if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
+fragment <<EOF
case OPTION_AUDIT:
gld${EMULATION_NAME}_append_to_separated_string (&audit, optarg);
break;
+
case 'P':
gld${EMULATION_NAME}_append_to_separated_string (&depaudit, optarg);
break;
-EOF
-
-if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
-fragment <<EOF
case OPTION_DISABLE_NEW_DTAGS:
link_info.new_dtags = FALSE;
break;
@@ -2215,14 +2222,6 @@ fragment <<EOF
link_info.eh_frame_hdr = TRUE;
break;
- case OPTION_LD_GENERATED_UNWIND_INFO:
- link_info.no_ld_generated_unwind_info = FALSE;
- break;
-
- case OPTION_NO_LD_GENERATED_UNWIND_INFO:
- link_info.no_ld_generated_unwind_info = TRUE;
- break;
-
case OPTION_GROUP:
link_info.flags_1 |= (bfd_vma) DF_1_GROUP;
/* Groups must be self-contained. */
@@ -2250,8 +2249,46 @@ fragment <<EOF
einfo (_("%P%F: invalid hash style \`%s'\n"), optarg);
break;
+EOF
+fi
+fragment <<EOF
case 'z':
- if (strcmp (optarg, "initfirst") == 0)
+ 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 (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);
+ }
+ 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);
+ }
+ 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 x"$GENERATE_SHLIB_SCRIPT" = xyes; then
+fragment <<EOF
+ else if (strcmp (optarg, "initfirst") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_INITFIRST;
else if (strcmp (optarg, "interpose") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_INTERPOSE;
@@ -2280,26 +2317,12 @@ fragment <<EOF
link_info.flags |= (bfd_vma) DF_ORIGIN;
link_info.flags_1 |= (bfd_vma) DF_1_ORIGIN;
}
- else if (strcmp (optarg, "defs") == 0)
- link_info.unresolved_syms_in_objects = RM_GENERATE_ERROR;
- else if (strcmp (optarg, "muldefs") == 0)
- link_info.allow_multiple_definition = TRUE;
else if (strcmp (optarg, "combreloc") == 0)
link_info.combreloc = TRUE;
else if (strcmp (optarg, "nocombreloc") == 0)
link_info.combreloc = FALSE;
else if (strcmp (optarg, "nocopyreloc") == 0)
link_info.nocopyreloc = TRUE;
- else if (strcmp (optarg, "execstack") == 0)
- {
- link_info.execstack = TRUE;
- link_info.noexecstack = FALSE;
- }
- else if (strcmp (optarg, "noexecstack") == 0)
- {
- link_info.noexecstack = TRUE;
- link_info.execstack = FALSE;
- }
EOF
if test -n "$COMMONPAGESIZE"; then
@@ -2310,30 +2333,13 @@ fragment <<EOF
link_info.relro = FALSE;
EOF
fi
+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);
- }
- 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);
- }
- /* What about the other Solaris -z options? FIXME. */
+ else
+ einfo (_("%P: warning: -z %s ignored.\n"), optarg);
break;
EOF
-fi
if test -n "$PARSE_AND_LIST_ARGS_CASES" ; then
fragment <<EOF
@@ -2355,19 +2361,24 @@ fragment <<EOF
static void
gld${EMULATION_NAME}_list_options (FILE * file)
{
- fprintf (file, _("\
- --build-id[=STYLE] Generate build ID note\n"));
+EOF
+if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
+fragment <<EOF
fprintf (file, _("\
--audit=AUDITLIB Specify a library to use for auditing\n"));
fprintf (file, _("\
- -P AUDITLIB, --depaudit=AUDITLIB\n" "\
- Specify a library to use for auditing dependencies\n"));
+ -Bgroup Selects group name lookup rules for DSO\n"));
+EOF
+fi
+fragment <<EOF
+ fprintf (file, _("\
+ --build-id[=STYLE] Generate build ID note\n"));
EOF
-
if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
fragment <<EOF
fprintf (file, _("\
- -Bgroup Selects group name lookup rules for DSO\n"));
+ -P AUDITLIB, --depaudit=AUDITLIB\n" "\
+ Specify a library to use for auditing dependencies\n"));
fprintf (file, _("\
--disable-new-dtags Disable new dynamic tags\n"));
fprintf (file, _("\
@@ -2375,13 +2386,25 @@ fragment <<EOF
fprintf (file, _("\
--eh-frame-hdr Create .eh_frame_hdr section\n"));
fprintf (file, _("\
+ --exclude-libs=LIBS Make all symbols in LIBS hidden\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"));
+EOF
+fi
+
+fragment <<EOF
+ fprintf (file, _("\
+ -z common-page-size=SIZE Set common page size to SIZE\n"));
fprintf (file, _("\
-z defs Report unresolved symbols in object files.\n"));
fprintf (file, _("\
-z execstack Mark executable as requiring executable stack\n"));
+EOF
+
+if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
+fragment <<EOF
fprintf (file, _("\
-z initfirst Mark DSO to be initialized first at runtime\n"));
fprintf (file, _("\
@@ -2390,8 +2413,18 @@ fragment <<EOF
-z lazy Mark object lazy runtime binding (default)\n"));
fprintf (file, _("\
-z loadfltr Mark object requiring immediate process\n"));
+EOF
+fi
+
+fragment <<EOF
+ fprintf (file, _("\
+ -z max-page-size=SIZE Set maximum page size to SIZE\n"));
fprintf (file, _("\
-z muldefs Allow multiple definitions\n"));
+EOF
+
+if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
+fragment <<EOF
fprintf (file, _("\
-z nocombreloc Don't merge dynamic relocs into one section\n"));
fprintf (file, _("\
@@ -2404,10 +2437,13 @@ fragment <<EOF
-z nodlopen Mark DSO not available to dlopen\n"));
fprintf (file, _("\
-z nodump Mark DSO not available to dldump\n"));
+EOF
+fi
+fragment <<EOF
fprintf (file, _("\
-z noexecstack Mark executable as not requiring executable stack\n"));
EOF
-
+if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
if test -n "$COMMONPAGESIZE"; then
fragment <<EOF
fprintf (file, _("\
@@ -2429,15 +2465,6 @@ fragment <<EOF
-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 "$PARSE_AND_LIST_OPTIONS" ; then
@@ -2456,17 +2483,6 @@ fragment <<EOF
EOF
fi
fi
-else
-fragment <<EOF
-#define gld${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
--
Alan Modra
Australia Development Lab, IBM
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