mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
64c7e34428
ARM _dl_tlsdesc_dynamic slow path has 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 hardfp builds. Different than setcontext, _dl_tlsdesc_dynamic
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.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
123 lines
3.4 KiB
Plaintext
123 lines
3.4 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
|
|
# Local configure fragment for sysdeps/arm.
|
|
|
|
# We check to see if the compiler and flags are
|
|
# selecting the hard-float ABI and if they are then
|
|
# we set libc_cv_arm_pcs_vfp to yes which causes
|
|
# HAVE_ARM_PCS_VFP to be defined in config.h and
|
|
# in include/libc-symbols.h and thus available to
|
|
# shlib-versions to select the appropriate name for
|
|
# the dynamic linker via %ifdef.
|
|
AC_CACHE_CHECK([whether the compiler is using the ARM hard-float ABI],
|
|
[libc_cv_arm_pcs_vfp],
|
|
[AC_EGREP_CPP(yes,[#ifdef __ARM_PCS_VFP
|
|
yes
|
|
#endif
|
|
], libc_cv_arm_pcs_vfp=yes, libc_cv_arm_pcs_vfp=no)])
|
|
if test $libc_cv_arm_pcs_vfp = yes; then
|
|
AC_DEFINE(HAVE_ARM_PCS_VFP)
|
|
LIBC_CONFIG_VAR([default-abi], [hard])
|
|
else
|
|
LIBC_CONFIG_VAR([default-abi], [soft])
|
|
fi
|
|
|
|
AC_CACHE_CHECK([whether VFP supports 32 registers],
|
|
libc_cv_arm_pcs_vfp_d32, [
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
void foo (void)
|
|
{
|
|
asm volatile ("vldr d16,=17" : : : "d16");
|
|
}
|
|
]])],
|
|
[libc_cv_arm_pcs_vfp_d32=yes],
|
|
[libc_cv_arm_pcs_vfp_d32=no])])
|
|
if test "$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
|
|
.syntax unified
|
|
.arm
|
|
.arch armv7-a
|
|
|
|
.text
|
|
.globl foo
|
|
.type foo,%function
|
|
foo: movw r0, #:lower16:symbol - 1f - 8
|
|
movt r0, #:upper16:symbol - 1f - 8
|
|
1: add r0, pc
|
|
@ And now a case with a local symbol.
|
|
movw r0, #:lower16:3f - 2f - 8
|
|
movt r0, #:upper16:3f - 2f - 8
|
|
2: add r0, pc
|
|
bx lr
|
|
|
|
.data
|
|
.globl symbol
|
|
.hidden symbol
|
|
symbol: .long 23
|
|
3: .long 17
|
|
EOF
|
|
libc_cv_arm_pcrel_movw=no
|
|
${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
|
|
-nostartfiles -nostdlib -shared \
|
|
-o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD &&
|
|
LC_ALL=C $READELF -dr conftest.so > conftest.dr 2>&AS_MESSAGE_LOG_FD &&
|
|
{
|
|
cat conftest.dr 1>&AS_MESSAGE_LOG_FD
|
|
grep -F 'TEXTREL
|
|
R_ARM_NONE' conftest.dr > /dev/null || libc_cv_arm_pcrel_movw=yes
|
|
}
|
|
rm -f conftest*])
|
|
if test $libc_cv_arm_pcrel_movw = yes; then
|
|
AC_DEFINE([ARM_PCREL_MOVW_OK])
|
|
fi
|
|
|
|
# This was buggy in assemblers from GNU binutils versions before 2.25.1
|
|
# (it's known to be broken in 2.24 and 2.25; see
|
|
# https://sourceware.org/bugzilla/show_bug.cgi?id=18383).
|
|
AC_CACHE_CHECK([whether TPOFF relocs with addends are assembled correctly],
|
|
libc_cv_arm_tpoff_addend, [
|
|
cat > conftest.s <<\EOF
|
|
.syntax unified
|
|
.arm
|
|
.arch armv7-a
|
|
|
|
.text
|
|
foo:
|
|
.word tbase(tpoff)+4
|
|
|
|
.section .tdata,"awT",%progbits
|
|
.word -4
|
|
tbase: .word 0
|
|
.word 4
|
|
EOF
|
|
libc_cv_arm_tpoff_addend=no
|
|
${CC-cc} -c $CFLAGS $CPPFLAGS \
|
|
-o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD &&
|
|
LC_ALL=C $READELF -x.text conftest.o > conftest.x 2>&AS_MESSAGE_LOG_FD &&
|
|
{
|
|
cat conftest.x 1>&AS_MESSAGE_LOG_FD
|
|
$AWK 'BEGIN { result = 2 }
|
|
$1 ~ /0x0+/ && $2 ~ /[[0-9a-f]]+/ {
|
|
# Check for little-endian or big-endian encoding of 4 in the in-place addend.
|
|
result = ($2 == "04000000" || $2 == "00000004") ? 0 : 1
|
|
}
|
|
END { exit(result) }
|
|
' conftest.x 2>&AS_MESSAGE_LOG_FD && libc_cv_arm_tpoff_addend=yes
|
|
}
|
|
rm -f conftest*])
|
|
if test $libc_cv_arm_tpoff_addend = no; then
|
|
LIBC_CONFIG_VAR([test-xfail-tst-tlsalign], [yes])
|
|
LIBC_CONFIG_VAR([test-xfail-tst-tlsalign-static], [yes])
|
|
fi
|
|
|
|
|
|
libc_cv_gcc_unwind_find_fde=no
|
|
|
|
# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
|
|
CFLAGS=${CFLAGS% -fno-unwind-tables}
|