* [PATCH 2/3] arm: Update _dl_tlsdesc_dynamic to preserve caller-saved registers (BZ 31372)
2024-02-29 19:46 [PATCH 0/3] Extending TLS testing and fixing TLS gnu2 for ARM Adhemerval Zanella
2024-02-29 19:46 ` [PATCH 1/3] Ignore undefined symbols for -mtls-dialect=gnu2 Adhemerval Zanella
@ 2024-02-29 19:46 ` Adhemerval Zanella
2024-02-29 19:46 ` [PATCH 3/3] elf: Enable TLS descriptor tests on aarch64 Adhemerval Zanella
2 siblings, 0 replies; 9+ messages in thread
From: Adhemerval Zanella @ 2024-02-29 19:46 UTC (permalink / raw)
To: libc-alpha; +Cc: Szabolcs Nagy, H . J . Lu
ARM _dl_tlsdesc_dynamic slow path shows two issues:
* The ip/r12 is defined by AAPCS as a scratch register, and gcc is
used
to save the stack pointer before on some function calls. So it
should also be saved/restored as well. It fixes the tst-gnu2-tls2.
* None of the possible VFP registers are saved/restored. ARM has the
additional complexity to have different VFP bank sizes (depending of
VFP support by the chip).
The tst-gnu2-tls2 test is extended to check for VFP registers, although
only for HWCAP_ARM_VFP | HWCAP_ARM_VFPD32. Different than setcontext,
this does not have HWCAP_ARM_IWMMXT (I don't have a way to properly test
it and it is almost a decade since newer hardware was released).
With this patch there is no need to mark tst-gnu2-tls2 as XFAIL.
Checked on arm-linux-gnueabihf.
---
config.h.in | 3 ++
elf/Makefile | 4 --
elf/tst-gnu2-tls2.h | 4 ++
elf/tst-gnu2-tls2mod0.c | 3 +-
elf/tst-gnu2-tls2mod1.c | 3 +-
elf/tst-gnu2-tls2mod2.c | 3 +-
sysdeps/arm/configure | 32 +++++++++++++
sysdeps/arm/configure.ac | 15 ++++++
sysdeps/arm/dl-tlsdesc.S | 70 +++++++++++++++++++++++----
sysdeps/arm/tst-gnu2-tls2.h | 96 +++++++++++++++++++++++++++++++++++++
10 files changed, 218 insertions(+), 15 deletions(-)
create mode 100644 sysdeps/arm/tst-gnu2-tls2.h
diff --git a/config.h.in b/config.h.in
index 2f0669e19b..cf4212f5eb 100644
--- a/config.h.in
+++ b/config.h.in
@@ -141,6 +141,9 @@
/* LOONGARCH floating-point ABI for ld.so. */
#undef LOONGARCH_ABI_FRLEN
+/* Define whether ARM used hard-float and support VFPvX-D32. */
+#undef HAVE_ARM_PCS_VFP_D32
+
/* Linux specific: minimum supported kernel version. */
#undef __LINUX_KERNEL_VERSION
diff --git a/elf/Makefile b/elf/Makefile
index 02dc476e27..a300cf2602 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -3056,10 +3056,6 @@ $(objpfx)tst-gnu2-tls2.out: \
$(objpfx)tst-gnu2-tls2mod2.so
ifeq (yes,$(have-mtls-dialect-gnu2))
-# This test fails if dl_tlsdesc_dynamic doesn't preserve all caller-saved
-# registers. See https://sourceware.org/bugzilla/show_bug.cgi?id=31372
-test-xfail-tst-gnu2-tls2 = yes
-
CFLAGS-tst-tlsgap-mod0.c += -mtls-dialect=gnu2
CFLAGS-tst-tlsgap-mod1.c += -mtls-dialect=gnu2
CFLAGS-tst-tlsgap-mod2.c += -mtls-dialect=gnu2
diff --git a/elf/tst-gnu2-tls2.h b/elf/tst-gnu2-tls2.h
index 77964a57a3..1ade8151e2 100644
--- a/elf/tst-gnu2-tls2.h
+++ b/elf/tst-gnu2-tls2.h
@@ -27,6 +27,10 @@ extern struct tls *apply_tls (struct tls *);
/* An architecture can define them to verify that clobber caller-saved
registers aren't changed by the implicit TLSDESC call. */
+#ifndef INIT_TLSDESC_CALL
+# define INIT_TLSDESC_CALL()
+#endif
+
#ifndef BEFORE_TLSDESC_CALL
# define BEFORE_TLSDESC_CALL()
#endif
diff --git a/elf/tst-gnu2-tls2mod0.c b/elf/tst-gnu2-tls2mod0.c
index 45556a0e17..3fe3c14277 100644
--- a/elf/tst-gnu2-tls2mod0.c
+++ b/elf/tst-gnu2-tls2mod0.c
@@ -16,13 +16,14 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include "tst-gnu2-tls2.h"
+#include <tst-gnu2-tls2.h>
__thread struct tls tls_var0 __attribute__ ((visibility ("hidden")));
struct tls *
apply_tls (struct tls *p)
{
+ INIT_TLSDESC_CALL ();
BEFORE_TLSDESC_CALL ();
tls_var0 = *p;
struct tls *ret = &tls_var0;
diff --git a/elf/tst-gnu2-tls2mod1.c b/elf/tst-gnu2-tls2mod1.c
index e10b9dbc0a..e210538468 100644
--- a/elf/tst-gnu2-tls2mod1.c
+++ b/elf/tst-gnu2-tls2mod1.c
@@ -16,13 +16,14 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include "tst-gnu2-tls2.h"
+#include <tst-gnu2-tls2.h>
__thread struct tls tls_var1[100] __attribute__ ((visibility ("hidden")));
struct tls *
apply_tls (struct tls *p)
{
+ INIT_TLSDESC_CALL ();
BEFORE_TLSDESC_CALL ();
tls_var1[1] = *p;
struct tls *ret = &tls_var1[1];
diff --git a/elf/tst-gnu2-tls2mod2.c b/elf/tst-gnu2-tls2mod2.c
index 141af51e55..6d3031dc5f 100644
--- a/elf/tst-gnu2-tls2mod2.c
+++ b/elf/tst-gnu2-tls2mod2.c
@@ -16,13 +16,14 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include "tst-gnu2-tls2.h"
+#include <tst-gnu2-tls2.h>
__thread struct tls tls_var2 __attribute__ ((visibility ("hidden")));
struct tls *
apply_tls (struct tls *p)
{
+ INIT_TLSDESC_CALL ();
BEFORE_TLSDESC_CALL ();
tls_var2 = *p;
struct tls *ret = &tls_var2;
diff --git a/sysdeps/arm/configure b/sysdeps/arm/configure
index 35e2918922..4ef4d46cbd 100644
--- a/sysdeps/arm/configure
+++ b/sysdeps/arm/configure
@@ -187,6 +187,38 @@ else
default-abi = soft"
fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether VFP supports 32 registers" >&5
+printf %s "checking whether VFP supports 32 registers... " >&6; }
+if test ${libc_cv_arm_pcs_vfp_d32+y}
+then :
+ printf %s "(cached) " >&6
+else $as_nop
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+void foo (void)
+{
+ asm volatile ("vldr d16,=17" : : : "d16");
+}
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+ libc_cv_arm_pcs_vfp_d32=yes
+else $as_nop
+ libc_cv_arm_pcs_vfp_d32=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_arm_pcs_vfp_d32" >&5
+printf "%s\n" "$libc_cv_arm_pcs_vfp_d32" >&6; }
+if test "$libc_cv_arm_pcs_vfp_d32" = yes ;
+then
+ printf "%s\n" "#define HAVE_ARM_PCS_VFP_D32 1" >>confdefs.h
+
+fi
+
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether PC-relative relocs in movw/movt work properly" >&5
printf %s "checking whether PC-relative relocs in movw/movt work properly... " >&6; }
if test ${libc_cv_arm_pcrel_movw+y}
diff --git a/sysdeps/arm/configure.ac b/sysdeps/arm/configure.ac
index 5172e30bbe..cd00ddc9d9 100644
--- a/sysdeps/arm/configure.ac
+++ b/sysdeps/arm/configure.ac
@@ -21,6 +21,21 @@ else
LIBC_CONFIG_VAR([default-abi], [soft])
fi
+AC_CACHE_CHECK([whether VFP supports 32 registers],
+ libc_cv_arm_pcs_vfp_d32, [
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+void foo (void)
+{
+ asm volatile ("vldr d16,=17" : : : "d16");
+}
+]])],
+ [libc_cv_arm_pcs_vfp_d32=yes],
+ [libc_cv_arm_pcs_vfp_d32=no])])
+if test "$libc_cv_arm_pcs_vfp_d32" = yes ;
+then
+ AC_DEFINE(HAVE_ARM_PCS_VFP_D32)
+fi
+
AC_CACHE_CHECK([whether PC-relative relocs in movw/movt work properly],
libc_cv_arm_pcrel_movw, [
cat > conftest.s <<\EOF
diff --git a/sysdeps/arm/dl-tlsdesc.S b/sysdeps/arm/dl-tlsdesc.S
index 764c56e70f..5c395fd22d 100644
--- a/sysdeps/arm/dl-tlsdesc.S
+++ b/sysdeps/arm/dl-tlsdesc.S
@@ -19,6 +19,7 @@
#include <sysdep.h>
#include <arm-features.h>
#include <tls.h>
+#include <rtld-global-offsets.h>
#include "tlsdesc.h"
.text
@@ -83,14 +84,20 @@ _dl_tlsdesc_dynamic(struct tlsdesc *tdp)
.align 2
_dl_tlsdesc_dynamic:
/* Our calling convention is to clobber r0, r1 and the processor
- flags. All others that are modified must be saved */
- eabi_save ({r2,r3,r4,lr})
- push {r2,r3,r4,lr}
- cfi_adjust_cfa_offset (16)
+ flags. All others that are modified must be saved. r5 is
+ used as the hwcap value to avoid reload after __tls_get_Addr
+ call. If required we will save the vector register on the slow
+ patch if required. */
+ eabi_save ({r2,r3,r4,r5,ip,lr})
+ push {r2,r3,r4,r5,ip,lr}
+ cfi_adjust_cfa_offset (24)
cfi_rel_offset (r2,0)
cfi_rel_offset (r3,4)
cfi_rel_offset (r4,8)
- cfi_rel_offset (lr,12)
+ cfi_rel_offset (r5,12)
+ cfi_rel_offset (ip,16)
+ cfi_rel_offset (lr,20)
+
ldr r1, [r0] /* td */
GET_TLS (lr)
mov r4, r0 /* r4 = tp */
@@ -113,22 +120,69 @@ _dl_tlsdesc_dynamic:
rsbne r0, r4, r3
bne 2f
1: mov r0, r1
+
+ /* Load the hwcap to check for vector support. */
+ ldr r2, 3f
+ ldr r1, .Lrtld_global_ro
+0: add r2, pc, r2
+ ldr r2, [r2, r1]
+ ldr r5, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
+
+#ifdef __SOFTFP__
+ tst r5, #HWCAP_ARM_VFP
+ beq .Lno_vfp
+#endif
+
+ /* Store the VFP registers. Don't use VFP instructions directly
+ because this code is used in non-VFP multilibs. */
+#define VFP_STACK_REQ (32*8 + 8)
+ sub sp, sp, VFP_STACK_REQ
+ cfi_adjust_cfa_offset (VFP_STACK_REQ)
+ mov r3, sp
+ .inst 0xeca30b20 /* vstmia r3!, {d0-d15} */
+ tst r5, #HWCAP_ARM_VFPD32
+ beq 4f
+ .inst 0xece30b20 /* vstmia r3!, {d16-d31} */
+ /* Store the floating-point status register. */
+4: .inst 0xeef12a10 /* vmrs r2, fpscr */
+ str r2, [r3]
+.Lno_vfp:
bl __tls_get_addr
rsb r0, r4, r0
+#ifdef __SOFTFP__
+ tst r5, #HWCAP_ARM_VFP
+ beq 2f
+#endif
+ mov r3, sp
+ .inst 0xecb30b20 /* vldmia r3!, {d0-d15} */
+ tst r5, #HWCAP_ARM_VFPD32
+ beq 5f
+ .inst 0xecf30b20 /* vldmia r3!, {d16-d31} */
+ ldr r4, [r3]
+5: .inst 0xeee14a10 /* vmsr fpscr, r4 */
+ add sp, sp, VFP_STACK_REQ
+ cfi_adjust_cfa_offset (-VFP_STACK_REQ)
+
2:
#if ((defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)) \
|| defined (ARM_ALWAYS_BX))
- pop {r2,r3,r4, lr}
- cfi_adjust_cfa_offset (-16)
+ pop {r2,r3,r4,r5,ip, lr}
+ cfi_adjust_cfa_offset (-20)
cfi_restore (lr)
+ cfi_restore (ip)
+ cfi_restore (r5)
cfi_restore (r4)
cfi_restore (r3)
cfi_restore (r2)
bx lr
#else
- pop {r2,r3,r4, pc}
+ pop {r2,r3,r4,r5,ip, pc}
#endif
eabi_fnend
cfi_endproc
.size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
+
+3: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
+.Lrtld_global_ro:
+ .long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
#endif /* SHARED */
diff --git a/sysdeps/arm/tst-gnu2-tls2.h b/sysdeps/arm/tst-gnu2-tls2.h
new file mode 100644
index 0000000000..7a73d7d1df
--- /dev/null
+++ b/sysdeps/arm/tst-gnu2-tls2.h
@@ -0,0 +1,96 @@
+/* Test TLSDESC relocation. ARM version.
+ Copyright (C) 2024 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+#include <sys/auxv.h>
+#include <string.h>
+#include <stdlib.h>
+#include <endian.h>
+
+#ifdef HAVE_ARM_PCS_VFP_D32
+# define INIT_TLSDESC_CALL() \
+ unsigned long hwcap = getauxval (AT_HWCAP)
+
+/* Set each vector register to a value from 1 to 32 before the TLS access,
+ dump to memory after TLS access, and compare with the expected values. */
+
+# define BEFORE_TLSDESC_CALL() \
+ if (hwcap & (HWCAP_ARM_VFP | HWCAP_ARM_VFPD32)) \
+ { \
+ asm volatile ("vldr d0,=1" : : : "d0"); \
+ asm volatile ("vldr d1,=2" : : : "d1"); \
+ asm volatile ("vldr d2,=3" : : : "d1"); \
+ asm volatile ("vldr d3,=4" : : : "d3"); \
+ asm volatile ("vldr d4,=5" : : : "d4"); \
+ asm volatile ("vldr d5,=6" : : : "d5"); \
+ asm volatile ("vldr d6,=7" : : : "d6"); \
+ asm volatile ("vldr d7,=8" : : : "d7"); \
+ asm volatile ("vldr d8,=9" : : : "d8"); \
+ asm volatile ("vldr d9,=10" : : : "d9"); \
+ asm volatile ("vldr d10,=11" : : : "d10"); \
+ asm volatile ("vldr d11,=12" : : : "d11"); \
+ asm volatile ("vldr d12,=13" : : : "d12"); \
+ asm volatile ("vldr d13,=14" : : : "d13"); \
+ asm volatile ("vldr d14,=15" : : : "d14"); \
+ asm volatile ("vldr d15,=16" : : : "d15"); \
+ asm volatile ("vldr d16,=17" : : : "d16"); \
+ asm volatile ("vldr d17,=18" : : : "d17"); \
+ asm volatile ("vldr d18,=19" : : : "d18"); \
+ asm volatile ("vldr d19,=20" : : : "d19"); \
+ asm volatile ("vldr d20,=21" : : : "d20"); \
+ asm volatile ("vldr d21,=22" : : : "d21"); \
+ asm volatile ("vldr d22,=23" : : : "d22"); \
+ asm volatile ("vldr d23,=24" : : : "d23"); \
+ asm volatile ("vldr d24,=25" : : : "d24"); \
+ asm volatile ("vldr d25,=26" : : : "d25"); \
+ asm volatile ("vldr d26,=27" : : : "d26"); \
+ asm volatile ("vldr d27,=28" : : : "d27"); \
+ asm volatile ("vldr d28,=29" : : : "d28"); \
+ asm volatile ("vldr d29,=30" : : : "d29"); \
+ asm volatile ("vldr d30,=31" : : : "d30"); \
+ asm volatile ("vldr d31,=32" : : : "d31"); \
+ }
+
+# define VFP_STACK_REQ (32*8)
+# if __BYTE_ORDER == __BIG_ENDIAN
+# define DISP 7
+# else
+# define DISP 0
+# endif
+
+# define AFTER_TLSDESC_CALL() \
+ if (hwcap & HWCAP_ARM_VFP) \
+ { \
+ char vfp[VFP_STACK_REQ]; \
+ asm volatile ("vstmia %0, {d0-d15}\n" \
+ "vstmia %1, {d16-d31}\n" \
+ : \
+ : "r" (vfp), "r" (vfp + 128) \
+ : "memory"); \
+ \
+ char expected[VFP_STACK_REQ]; \
+ memset (expected, 0, sizeof expected); \
+ for (int i = 0; i < 32; ++i) \
+ expected[i * 8 + DISP] = i + 1; \
+ \
+ if (memcmp (vfp, expected, VFP_STACK_REQ) != 0) \
+ abort (); \
+ }
+#endif
+
+#include_next <tst-gnu2-tls2.h>
--
2.34.1
^ permalink raw reply [flat|nested] 9+ messages in thread* [PATCH 3/3] elf: Enable TLS descriptor tests on aarch64
2024-02-29 19:46 [PATCH 0/3] Extending TLS testing and fixing TLS gnu2 for ARM Adhemerval Zanella
2024-02-29 19:46 ` [PATCH 1/3] Ignore undefined symbols for -mtls-dialect=gnu2 Adhemerval Zanella
2024-02-29 19:46 ` [PATCH 2/3] arm: Update _dl_tlsdesc_dynamic to preserve caller-saved registers (BZ 31372) Adhemerval Zanella
@ 2024-02-29 19:46 ` Adhemerval Zanella
2024-03-11 12:31 ` Szabolcs Nagy
2 siblings, 1 reply; 9+ messages in thread
From: Adhemerval Zanella @ 2024-02-29 19:46 UTC (permalink / raw)
To: libc-alpha; +Cc: Szabolcs Nagy, H . J . Lu
The aarch64 uses a different name than x86 and arm (trad instead
os gnu2). Use it to check whether to enable the TLS descriptor
tests.
Also rename the internal machinery fron gnu2 to tls descriptors.
Checked on aarch64-linux-gnu.
---
configure | 23 +++++++++++++----------
configure.ac | 15 +++++++++------
elf/Makefile | 26 +++++++++++++-------------
sysdeps/aarch64/preconfigure | 1 +
sysdeps/arm/Makefile | 8 ++++----
5 files changed, 40 insertions(+), 33 deletions(-)
diff --git a/configure b/configure
index ab8a10ed92..034ac9017a 100755
--- a/configure
+++ b/configure
@@ -653,7 +653,7 @@ LIBGD
libc_cv_cc_loop_to_function
libc_cv_cc_submachine
libc_cv_cc_nofma
-libc_cv_mtls_dialect_gnu2
+libc_cv_mtls_descriptor
libc_cv_has_glob_dat
libc_cv_fpie
libc_cv_z_execstack
@@ -4760,6 +4760,9 @@ libc_config_ok=no
# whether to use such directories.
with_fp_cond=1
+# A preconfigure script may define another name to TLS descriptor variant
+mtls_descriptor=gnu2
+
if frags=`ls -d $srcdir/sysdeps/*/preconfigure 2> /dev/null`
then
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for sysdeps preconfigure fragments" >&5
@@ -7006,9 +7009,9 @@ fi
printf "%s\n" "$libc_cv_has_glob_dat" >&6; }
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -mtls-dialect=gnu2" >&5
-printf %s "checking for -mtls-dialect=gnu2... " >&6; }
-if test ${libc_cv_mtls_dialect_gnu2+y}
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for tls descriptor support" >&5
+printf %s "checking for tls descriptor support... " >&6; }
+if test ${libc_cv_mtls_descriptor+y}
then :
printf %s "(cached) " >&6
else $as_nop
@@ -7019,7 +7022,7 @@ void foo (void)
i = 10;
}
EOF
-if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=gnu2 -nostdlib -nostartfiles
+if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=$mtls_descriptor -nostdlib -nostartfiles
-Wl,--unresolved-symbols=ignore-all conftest.c -o conftest 1>&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
@@ -7027,17 +7030,17 @@ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=gnu2 -nostdlib -nost
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then
- libc_cv_mtls_dialect_gnu2=yes
+ libc_cv_mtls_descriptor=$mtls_descriptor
else
- libc_cv_mtls_dialect_gnu2=no
+ libc_cv_mtls_descriptor=no
fi
rm -f conftest*
fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mtls_dialect_gnu2" >&5
-printf "%s\n" "$libc_cv_mtls_dialect_gnu2" >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mtls_descriptor" >&5
+printf "%s\n" "$libc_cv_mtls_descriptor" >&6; }
config_vars="$config_vars
-have-mtls-dialect-gnu2 = $libc_cv_mtls_dialect_gnu2"
+have-mtls-descriptor = $libc_cv_mtls_descriptor"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if -Wno-ignored-attributes is required for aliases" >&5
printf %s "checking if -Wno-ignored-attributes is required for aliases... " >&6; }
diff --git a/configure.ac b/configure.ac
index 4bb9aeef95..ddfb2876a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -442,6 +442,9 @@ libc_config_ok=no
# whether to use such directories.
with_fp_cond=1
+# A preconfigure script may define another name to TLS descriptor variant
+mtls_descriptor=gnu2
+
dnl Let sysdeps/*/preconfigure act here.
LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
@@ -1287,7 +1290,7 @@ fi
rm -f conftest*])
AC_SUBST(libc_cv_has_glob_dat)
-AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
+AC_CACHE_CHECK([for tls descriptor support], libc_cv_mtls_descriptor,
[dnl
cat > conftest.c <<EOF
__thread int i;
@@ -1296,16 +1299,16 @@ void foo (void)
i = 10;
}
EOF
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=gnu2 -nostdlib -nostartfiles
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=$mtls_descriptor -nostdlib -nostartfiles
-Wl,--unresolved-symbols=ignore-all conftest.c -o conftest 1>&AS_MESSAGE_LOG_FD])
then
- libc_cv_mtls_dialect_gnu2=yes
+ libc_cv_mtls_descriptor=$mtls_descriptor
else
- libc_cv_mtls_dialect_gnu2=no
+ libc_cv_mtls_descriptor=no
fi
rm -f conftest*])
-AC_SUBST(libc_cv_mtls_dialect_gnu2)
-LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
+AC_SUBST(libc_cv_mtls_descriptor)
+LIBC_CONFIG_VAR([have-mtls-descriptor], [$libc_cv_mtls_descriptor])
dnl clang emits an warning for a double alias redirection, to warn the
dnl original symbol is sed even when weak definition overrides it.
diff --git a/elf/Makefile b/elf/Makefile
index a300cf2602..ebbe1bcf3f 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -999,13 +999,13 @@ modules-names-tests = $(filter-out ifuncmod% tst-tlsmod%,\
# For +depfiles in Makerules.
extra-test-objs += tst-auditmod17.os
-ifeq (yes,$(have-mtls-dialect-gnu2))
+ifneq (no,$(have-mtls-descriptor))
tests += tst-gnu2-tls1
modules-names += tst-gnu2-tls1mod
$(objpfx)tst-gnu2-tls1: $(objpfx)tst-gnu2-tls1mod.so
tst-gnu2-tls1mod.so-no-z-defs = yes
-CFLAGS-tst-gnu2-tls1mod.c += -mtls-dialect=gnu2
-endif # $(have-mtls-dialect-gnu2)
+CFLAGS-tst-gnu2-tls1mod.c += -mtls-dialect=$(have-mtls-descriptor)
+endif # $(have-mtls-descriptor)
ifeq (yes,$(have-protected-data))
modules-names += tst-protected1moda tst-protected1modb
@@ -2972,11 +2972,11 @@ $(objpfx)tst-tls-allocation-failure-static-patched.out: \
$(objpfx)tst-audit-tlsdesc: $(objpfx)tst-audit-tlsdesc-mod1.so \
$(objpfx)tst-audit-tlsdesc-mod2.so \
$(shared-thread-library)
-ifeq (yes,$(have-mtls-dialect-gnu2))
+ifneq (no,$(have-mtls-descriptor))
# The test is valid for all TLS types, but we want to exercise GNU2
# TLS if possible.
-CFLAGS-tst-audit-tlsdesc-mod1.c += -mtls-dialect=gnu2
-CFLAGS-tst-audit-tlsdesc-mod2.c += -mtls-dialect=gnu2
+CFLAGS-tst-audit-tlsdesc-mod1.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-audit-tlsdesc-mod2.c += -mtls-dialect=$(have-mtls-descriptor)
endif
$(objpfx)tst-audit-tlsdesc-dlopen: $(shared-thread-library)
$(objpfx)tst-audit-tlsdesc-dlopen.out: $(objpfx)tst-audit-tlsdesc-mod1.so \
@@ -3055,11 +3055,11 @@ $(objpfx)tst-gnu2-tls2.out: \
$(objpfx)tst-gnu2-tls2mod1.so \
$(objpfx)tst-gnu2-tls2mod2.so
-ifeq (yes,$(have-mtls-dialect-gnu2))
-CFLAGS-tst-tlsgap-mod0.c += -mtls-dialect=gnu2
-CFLAGS-tst-tlsgap-mod1.c += -mtls-dialect=gnu2
-CFLAGS-tst-tlsgap-mod2.c += -mtls-dialect=gnu2
-CFLAGS-tst-gnu2-tls2mod0.c += -mtls-dialect=gnu2
-CFLAGS-tst-gnu2-tls2mod1.c += -mtls-dialect=gnu2
-CFLAGS-tst-gnu2-tls2mod2.c += -mtls-dialect=gnu2
+ifneq (no,$(have-mtls-descriptor))
+CFLAGS-tst-tlsgap-mod0.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-tlsgap-mod1.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-tlsgap-mod2.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-gnu2-tls2mod0.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-gnu2-tls2mod1.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-gnu2-tls2mod2.c += -mtls-dialect=$(have-mtls-descriptor)
endif
diff --git a/sysdeps/aarch64/preconfigure b/sysdeps/aarch64/preconfigure
index d9bd1f8558..89edb0c9a2 100644
--- a/sysdeps/aarch64/preconfigure
+++ b/sysdeps/aarch64/preconfigure
@@ -2,5 +2,6 @@ case "$machine" in
aarch64*)
base_machine=aarch64
machine=aarch64
+ mtls_descriptor=trad
;;
esac
diff --git a/sysdeps/arm/Makefile b/sysdeps/arm/Makefile
index d5cea717a9..619474eca9 100644
--- a/sysdeps/arm/Makefile
+++ b/sysdeps/arm/Makefile
@@ -13,15 +13,15 @@ $(objpfx)libgcc-stubs.a: $(objpfx)aeabi_unwind_cpp_pr1.os
lib-noranlib: $(objpfx)libgcc-stubs.a
ifeq ($(build-shared),yes)
-ifeq (yes,$(have-mtls-dialect-gnu2))
+ifneq (no,$(have-mtls-descriptor))
tests += tst-armtlsdescloc tst-armtlsdescextnow tst-armtlsdescextlazy
modules-names += tst-armtlsdesclocmod
modules-names += tst-armtlsdescextlazymod tst-armtlsdescextnowmod
CPPFLAGS-tst-armtlsdescextnowmod.c += -Dstatic=
CPPFLAGS-tst-armtlsdescextlazymod.c += -Dstatic=
-CFLAGS-tst-armtlsdesclocmod.c += -mtls-dialect=gnu2
-CFLAGS-tst-armtlsdescextnowmod.c += -mtls-dialect=gnu2
-CFLAGS-tst-armtlsdescextlazymod.c += -mtls-dialect=gnu2
+CFLAGS-tst-armtlsdesclocmod.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-armtlsdescextnowmod.c += -mtls-dialect=$(have-mtls-descriptor)
+CFLAGS-tst-armtlsdescextlazymod.c += -mtls-dialect=$(have-mtls-descriptor)
LDFLAGS-tst-armtlsdescextnowmod.so += -Wl,-z,now
tst-armtlsdescloc-ENV = LD_BIND_NOW=1
tst-armtlsdescextnow-ENV = LD_BIND_NOW=1
--
2.34.1
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