1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
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}
|
