[PATCH 2/2] ld: Add --enable-make-plt configure option
H.J. Lu
hjl.tools@gmail.com
Fri Jan 5 21:50:15 GMT 2024
Add --enable-make-plt linker configure option to mark PLT entries with
DT_X86_64_PLT, DT_X86_64_PLTSZ and DT_X86_64_PLTENT dynamic tags by
default.
* NEWS: Mention -z mark-plt/-z nomark-plt and --enable-make-plt.
* config.in: Regenerated.
* configure: Likewise.
* configure.ac: Add --enable-make-plt.
(DEFAULT_LD_Z_MARK_PLT): New AC_DEFINE_UNQUOTED.
* emulparams/x86-64-plt.sh (PARSE_AND_LIST_OPTIONS_X86_64_PLT):
Support DEFAULT_LD_Z_MARK_PLT.
* emultempl/elf-x86.em (elf_x86_64_before_parse): New function.
(LDEMUL_BEFORE_PARSE): New. Set to elf_x86_64_before_parse for
x86-64 targets.
* testsuite/ld-elf/indirect-extern-access-2.rd: Allow non-zero
r_addend for JUMP_SLOT relocation.
* testsuite/ld-elf/pr23161d.rd: Likewise.
* testsuite/ld-ifunc/ifunc-25c-x86.d: Likewise.
* testsuite/ld-ifunc/ifunc-16-x86-64-now.d: Pass -z nomark-plt
to linker.
* testsuite/ld-ifunc/ifunc-16-x86-64.d: Likewise.
* testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d: Likewise.
* testsuite/ld-ifunc/ifunc-2-local-x86-64.d: Likewise.
* testsuite/ld-ifunc/ifunc-2-x86-64-now.d: Likewise.
* testsuite/ld-ifunc/ifunc-2-x86-64.d: Likewise.
* testsuite/ld-ifunc/ifunc-20-x86-64.d: Likewise.
* testsuite/ld-ifunc/ifunc-5b-x86-64.d: Likewise.
* testsuite/ld-ifunc/pr17154-x86-64-now.d: Likewise.
* testsuite/ld-ifunc/pr17154-x86-64.d: Likewise.
* testsuite/ld-x86-64/x86-64.exp (LDFLAGS): Save and restore
the original linker flags. Append -z nomark-plt.
Run i386 tests before appending -z nomark-plt to LDFLAGS.
---
ld/NEWS | 5 +++
ld/config.in | 4 +++
ld/configure | 26 +++++++++++++--
ld/configure.ac | 17 ++++++++++
ld/emulparams/x86-64-plt.sh | 7 +++-
ld/emultempl/elf-x86.em | 17 ++++++++++
.../ld-elf/indirect-extern-access-2.rd | 2 +-
ld/testsuite/ld-elf/pr23161d.rd | 2 +-
ld/testsuite/ld-ifunc/ifunc-16-x86-64-now.d | 2 +-
ld/testsuite/ld-ifunc/ifunc-16-x86-64.d | 2 +-
.../ld-ifunc/ifunc-2-local-x86-64-now.d | 2 +-
ld/testsuite/ld-ifunc/ifunc-2-local-x86-64.d | 2 +-
ld/testsuite/ld-ifunc/ifunc-2-x86-64-now.d | 2 +-
ld/testsuite/ld-ifunc/ifunc-2-x86-64.d | 2 +-
ld/testsuite/ld-ifunc/ifunc-20-x86-64.d | 2 +-
ld/testsuite/ld-ifunc/ifunc-25c-x86.d | 2 +-
ld/testsuite/ld-ifunc/ifunc-5b-x86-64.d | 2 +-
ld/testsuite/ld-ifunc/pr17154-x86-64-now.d | 2 +-
ld/testsuite/ld-ifunc/pr17154-x86-64.d | 2 +-
ld/testsuite/ld-x86-64/x86-64.exp | 33 ++++++++++++++++---
20 files changed, 114 insertions(+), 21 deletions(-)
diff --git a/ld/NEWS b/ld/NEWS
index a2c0b7fbcfe..3d3bb59b71b 100644
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -1,5 +1,10 @@
-*- text -*-
+* Add -z mark-plt/-z nomark-plt options to x86-64 ELF linker to mark PLT
+ entries with DT_X86_64_PLT, DT_X86_64_PLTSZ and DT_X86_64_PLTENT dynamic
+ tags. Also added --enable-make-plt configure option to mark PLT entries
+ by default.
+
* Support Intel APX relocations.
* On RISC-V, add ld target option --[no-]check-uleb128. Should rebuild the
diff --git a/ld/config.in b/ld/config.in
index 86d90d53752..52d62f06ff0 100644
--- a/ld/config.in
+++ b/ld/config.in
@@ -45,6 +45,10 @@
default. */
#undef DEFAULT_LD_WARN_RWX_SEGMENTS
+/* Define to 1 if you want to enable -z mark-plt in ELF x86-64 linker by
+ default. */
+#undef DEFAULT_LD_Z_MARK_PLT
+
/* Define to 1 if you want to enable -z relro in ELF linker by default. */
#undef DEFAULT_LD_Z_RELRO
diff --git a/ld/configure b/ld/configure
index 07eb669d906..d01dbfae296 100755
--- a/ld/configure
+++ b/ld/configure
@@ -852,6 +852,7 @@ enable_new_dtags
enable_relro
enable_textrel_check
enable_separate_code
+enable_mark_plt
enable_warn_execstack
enable_error_execstack
enable_warn_rwx_segments
@@ -1546,6 +1547,7 @@ Optional Features:
--enable-textrel-check=[yes|no|warning|error]
enable DT_TEXTREL check in ELF linker
--enable-separate-code enable -z separate-code in ELF linker by default
+ --enable-make-plt enable -z mark-plt in ELF x86-64 linker by default
--enable-warn-execstack enable warnings when creating an executable stack
--enable-error-execstack
turn executable stack warnings into errors
@@ -11681,7 +11683,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11684 "configure"
+#line 11686 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -11787,7 +11789,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11790 "configure"
+#line 11792 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -15682,6 +15684,17 @@ esac
fi
+# Decide if -z mark-plt should be enabled in ELF x86-64 linker by default.
+ac_default_ld_z_mark_plt=unset
+# Check whether --enable-mark-plt was given.
+if test "${enable_mark_plt+set}" = set; then :
+ enableval=$enable_mark_plt; case "${enableval}" in
+ yes) ac_default_ld_z_mark_plt=1 ;;
+ no) ac_default_ld_z_mark_plt=0 ;;
+esac
+fi
+
+
# By default warn when an executable stack is created due to object files
# requesting such, not when the user specifies -z execstack.
@@ -19365,6 +19378,15 @@ cat >>confdefs.h <<_ACEOF
_ACEOF
+if test "${ac_default_ld_z_mark_plt}" = unset; then
+ ac_default_ld_z_mark_plt=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define DEFAULT_LD_Z_MARK_PLT $ac_default_ld_z_mark_plt
+_ACEOF
+
+
cat >>confdefs.h <<_ACEOF
diff --git a/ld/configure.ac b/ld/configure.ac
index b46f415fe9b..9036090889e 100644
--- a/ld/configure.ac
+++ b/ld/configure.ac
@@ -213,6 +213,16 @@ AC_ARG_ENABLE(separate-code,
no) ac_default_ld_z_separate_code=0 ;;
esac])
+# Decide if -z mark-plt should be enabled in ELF x86-64 linker by default.
+ac_default_ld_z_mark_plt=unset
+AC_ARG_ENABLE(mark-plt,
+ AS_HELP_STRING([--enable-make-plt],
+ [enable -z mark-plt in ELF x86-64 linker by default]),
+[case "${enableval}" in
+ yes) ac_default_ld_z_mark_plt=1 ;;
+ no) ac_default_ld_z_mark_plt=0 ;;
+esac])
+
# By default warn when an executable stack is created due to object files
# requesting such, not when the user specifies -z execstack.
@@ -562,6 +572,13 @@ AC_DEFINE_UNQUOTED(DEFAULT_LD_Z_SEPARATE_CODE,
$ac_default_ld_z_separate_code,
[Define to 1 if you want to enable -z separate-code in ELF linker by default.])
+if test "${ac_default_ld_z_mark_plt}" = unset; then
+ ac_default_ld_z_mark_plt=0
+fi
+AC_DEFINE_UNQUOTED(DEFAULT_LD_Z_MARK_PLT,
+ $ac_default_ld_z_mark_plt,
+ [Define to 1 if you want to enable -z mark-plt in ELF x86-64 linker by default.])
+
AC_DEFINE_UNQUOTED(DEFAULT_LD_WARN_EXECSTACK,
$ac_default_ld_warn_execstack,
diff --git a/ld/emulparams/x86-64-plt.sh b/ld/emulparams/x86-64-plt.sh
index 92732401dc7..d1a5c65937f 100644
--- a/ld/emulparams/x86-64-plt.sh
+++ b/ld/emulparams/x86-64-plt.sh
@@ -1,5 +1,10 @@
PARSE_AND_LIST_OPTIONS_X86_64_PLT='
- fprintf (file, _("\
+ if (DEFAULT_LD_Z_MARK_PLT != 0)
+ fprintf (file, _("\
+ -z mark-plt Mark PLT with dynamic tags (default)\n\
+ -z nomark-plt Do not mark PLT with dynamic tags\n"));
+ else
+ fprintf (file, _("\
-z mark-plt Mark PLT with dynamic tags\n\
-z nomark-plt Do not mark PLT with dynamic tags (default)\n"));
'
diff --git a/ld/emultempl/elf-x86.em b/ld/emultempl/elf-x86.em
index 0ccad72ab9a..a6eda14253f 100644
--- a/ld/emultempl/elf-x86.em
+++ b/ld/emultempl/elf-x86.em
@@ -56,3 +56,20 @@ EOF
LDEMUL_BEFORE_PARSE=elf_x86_before_parse
fi
+
+case x${OUTPUT_FORMAT} in
+ x*x86-64*)
+fragment <<EOF
+
+static void
+elf_x86_64_before_parse (void)
+{
+ params.mark_plt = DEFAULT_LD_Z_MARK_PLT;
+
+ elf_x86_before_parse ();
+}
+EOF
+
+ LDEMUL_BEFORE_PARSE=elf_x86_64_before_parse
+ ;;
+esac
diff --git a/ld/testsuite/ld-elf/indirect-extern-access-2.rd b/ld/testsuite/ld-elf/indirect-extern-access-2.rd
index 9c7d72fae25..89c9e2ed336 100644
--- a/ld/testsuite/ld-elf/indirect-extern-access-2.rd
+++ b/ld/testsuite/ld-elf/indirect-extern-access-2.rd
@@ -1,5 +1,5 @@
#...
-[a-f0-9]+ +[0-9a-f]+ +R_.*_JUMP_SLO(T|) +[a-f0-9]+ +indirect_extern_access( \+ 0|)
+[a-f0-9]+ +[0-9a-f]+ +R_.*_JUMP_SLO(T|) +[a-f0-9]+ +indirect_extern_access( \+ [a-f0-9]+|)
#...
Displaying notes found in: .note.gnu.property
[ ]+Owner[ ]+Data size[ ]+Description
diff --git a/ld/testsuite/ld-elf/pr23161d.rd b/ld/testsuite/ld-elf/pr23161d.rd
index 338cfad336b..e7756b3f61b 100644
--- a/ld/testsuite/ld-elf/pr23161d.rd
+++ b/ld/testsuite/ld-elf/pr23161d.rd
@@ -1,6 +1,6 @@
Relocation section '\.rel(a|)\.plt' at offset 0x[0-9a-f]+ contains 1 entry:
+Offset +Info +Type +Sym.* Value +Sym.* Name( \+ Addend|)
-[a-f0-9]+ +[0-9a-f]+ +R_.*_JUMP_SLOT +[a-f0-9]+ +foo( \+ 0|)
+[a-f0-9]+ +[0-9a-f]+ +R_.*_JUMP_SLOT +[a-f0-9]+ +foo( \+ [a-f0-9]+|)
Symbol table '\.dynsym' contains [0-9]+ entries:
+Num: +Value +Size Type +Bind +Vis +Ndx Name
diff --git a/ld/testsuite/ld-ifunc/ifunc-16-x86-64-now.d b/ld/testsuite/ld-ifunc/ifunc-16-x86-64-now.d
index db6c0e285a1..32ab488ca7a 100644
--- a/ld/testsuite/ld-ifunc/ifunc-16-x86-64-now.d
+++ b/ld/testsuite/ld-ifunc/ifunc-16-x86-64-now.d
@@ -1,6 +1,6 @@
#source: ifunc-16-x86.s
#as: --64
-#ld: -z now -shared -melf_x86_64
+#ld: -z now -z nomark-plt -shared -melf_x86_64
#readelf: -r --wide
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/ifunc-16-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-16-x86-64.d
index d69626d3021..06c1ed90b92 100644
--- a/ld/testsuite/ld-ifunc/ifunc-16-x86-64.d
+++ b/ld/testsuite/ld-ifunc/ifunc-16-x86-64.d
@@ -1,6 +1,6 @@
#source: ifunc-16-x86.s
#as: --64
-#ld: -shared -melf_x86_64
+#ld: -z nomark-plt -shared -melf_x86_64
#readelf: -r --wide
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d b/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d
index e038b37a6d6..6d98d66ebd4 100644
--- a/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d
+++ b/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d
@@ -1,6 +1,6 @@
#source: ifunc-2-local-x86-64.s
#as: --64
-#ld: -z now -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code $NO_DT_RELR_LDFLAGS
+#ld: -z now -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code -z nomark-plt $NO_DT_RELR_LDFLAGS
#objdump: -dw
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64.d
index 14a57280327..4d2f4bff82c 100644
--- a/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64.d
+++ b/ld/testsuite/ld-ifunc/ifunc-2-local-x86-64.d
@@ -1,5 +1,5 @@
#as: --64
-#ld: -shared -melf_x86_64 --hash-style=sysv -z noseparate-code
+#ld: -shared -melf_x86_64 --hash-style=sysv -z noseparate-code -z nomark-plt
#objdump: -dw
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/ifunc-2-x86-64-now.d b/ld/testsuite/ld-ifunc/ifunc-2-x86-64-now.d
index 47db0125612..8b248d393b0 100644
--- a/ld/testsuite/ld-ifunc/ifunc-2-x86-64-now.d
+++ b/ld/testsuite/ld-ifunc/ifunc-2-x86-64-now.d
@@ -1,6 +1,6 @@
#source: ifunc-2-x86-64.s
#as: --64
-#ld: -z now -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code $NO_DT_RELR_LDFLAGS
+#ld: -z now -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code -z nomark-plt $NO_DT_RELR_LDFLAGS
#objdump: -dw
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/ifunc-2-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-2-x86-64.d
index 2a1f2698a2a..8eb7583a3d3 100644
--- a/ld/testsuite/ld-ifunc/ifunc-2-x86-64.d
+++ b/ld/testsuite/ld-ifunc/ifunc-2-x86-64.d
@@ -1,5 +1,5 @@
#as: --64
-#ld: -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code
+#ld: -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code -z nomark-plt
#objdump: -dw
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/ifunc-20-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-20-x86-64.d
index 0ea46a6a2d2..5cd12aa4e3f 100644
--- a/ld/testsuite/ld-ifunc/ifunc-20-x86-64.d
+++ b/ld/testsuite/ld-ifunc/ifunc-20-x86-64.d
@@ -1,5 +1,5 @@
#source: ifunc-20.s
-#ld: -shared -m elf_x86_64 -z nocombreloc
+#ld: -shared -m elf_x86_64 -z nocombreloc -z nomark-plt
#as: --64
#readelf: -r --wide
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/ifunc-25c-x86.d b/ld/testsuite/ld-ifunc/ifunc-25c-x86.d
index e2401a9f160..c278c5784d6 100644
--- a/ld/testsuite/ld-ifunc/ifunc-25c-x86.d
+++ b/ld/testsuite/ld-ifunc/ifunc-25c-x86.d
@@ -9,4 +9,4 @@ Relocation section '.rel(a|).dyn' at offset 0x[0-9a-f]+ contains 1 entry:
Relocation section '.rel(a|).plt' at offset 0x[0-9a-f]+ contains 1 entry:
+Offset +Info +Type +Sym.* Value +Symbol's Name.*
-[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_(386|X86_64)_JUMP_SLOT +foo\(\) +foo( \+ 0|)
+[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_(386|X86_64)_JUMP_SLOT +foo\(\) +foo( \+ [0-9a-f]+|)
diff --git a/ld/testsuite/ld-ifunc/ifunc-5b-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-5b-x86-64.d
index 02aff6b7c85..715271f65ff 100644
--- a/ld/testsuite/ld-ifunc/ifunc-5b-x86-64.d
+++ b/ld/testsuite/ld-ifunc/ifunc-5b-x86-64.d
@@ -1,6 +1,6 @@
#source: ifunc-5-x86-64.s
#as: --64
-#ld: -melf_x86_64 -shared -z nocombreloc
+#ld: -melf_x86_64 -shared -z nocombreloc -z nomark-plt
#readelf: -r --wide
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/pr17154-x86-64-now.d b/ld/testsuite/ld-ifunc/pr17154-x86-64-now.d
index f6920272b63..4d2ae8413f2 100644
--- a/ld/testsuite/ld-ifunc/pr17154-x86-64-now.d
+++ b/ld/testsuite/ld-ifunc/pr17154-x86-64-now.d
@@ -1,6 +1,6 @@
#source: pr17154-x86.s
#as: --64
-#ld: -z now -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code $NO_DT_RELR_LDFLAGS
+#ld: -z now -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code -z nomark-plt $NO_DT_RELR_LDFLAGS
#objdump: -dw
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-ifunc/pr17154-x86-64.d b/ld/testsuite/ld-ifunc/pr17154-x86-64.d
index 90918426ee5..fbe6e225d5c 100644
--- a/ld/testsuite/ld-ifunc/pr17154-x86-64.d
+++ b/ld/testsuite/ld-ifunc/pr17154-x86-64.d
@@ -1,6 +1,6 @@
#source: pr17154-x86.s
#as: --64
-#ld: -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code $NO_DT_RELR_LDFLAGS
+#ld: -shared -melf_x86_64 --hash-style=sysv -z max-page-size=0x200000 -z noseparate-code -z nomark-plt $NO_DT_RELR_LDFLAGS
#objdump: -dw
#target: x86_64-*-*
diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp
index f656218df41..06fbb73bc26 100644
--- a/ld/testsuite/ld-x86-64/x86-64.exp
+++ b/ld/testsuite/ld-x86-64/x86-64.exp
@@ -30,6 +30,33 @@ set emul "elf_x86_64"
set saved_ASFLAGS "$ASFLAGS"
set ASFLAGS "$ASFLAGS -mx86-used-note=no"
+# Don't add the unsupported -z nomark-plt linker option to i386 tests.
+run_ld_link_tests [list \
+ [list \
+ "Helper 32bit object 1" \
+ "-r -melf_i386" \
+ "" \
+ "--32" \
+ {mixed1b.s} \
+ {} \
+ "libmixe1b.o" \
+ ] \
+ [list \
+ "Helper 32bit object 2" \
+ "-r -melf_i386" \
+ "" \
+ "--32" \
+ {mixed2b.s} \
+ {} \
+ "libmixe2b.o" \
+ ] \
+]
+
+run_dump_test "ia32-1"
+
+set saved_LDFLAGS "$LDFLAGS"
+set LDFLAGS "$LDFLAGS -z nomark-plt"
+
# List contains test-items with 3 items followed by 2 lists:
# 0:name 1:ld early options 2:ld late options 3:assembler options
# 4:filenames of assembler files 5: action and options. 6: name of output file
@@ -88,12 +115,8 @@ set x86_64tests {
{{objdump -dwr tlsie1.dd}} "tlsie1"}
{"Helper 64bit object 1" "-r -melf_x86_64" ""
"--64" {mixed1a.s} {} "libmixe1a.o"}
- {"Helper 32bit object 1" "-r -melf_i386" ""
- "--32" {mixed1b.s} {} "libmixe1b.o"}
{"Helper 64bit object 2" "-r -melf_x86_64" ""
"--64" {mixed2a.s} {} "libmixe2a.o"}
- {"Helper 32bit object 2" "-r -melf_i386" ""
- "--32" {mixed2b.s} {} "libmixe2b.o"}
{"Split by file with 'l' flag on section."
"-split-by-file -r -melf_x86_64" ""
"--64" {split-by-file1.s split-by-file2.s}
@@ -559,7 +582,6 @@ run_dump_test "ilp32-9"
run_dump_test "ilp32-10"
run_dump_test "ilp32-11"
run_dump_test "ilp32-12"
-run_dump_test "ia32-1"
run_dump_test "ia32-2"
run_dump_test "ia32-3"
run_dump_test "lp64-1"
@@ -2266,3 +2288,4 @@ if { [check_compiler_available] } {
}
set ASFLAGS "$saved_ASFLAGS"
+set LDFLAGS "$saved_LDFLAGS"
--
2.43.0
More information about the Binutils
mailing list