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* [glibc/nsz/pacbti-v6] aarch64: configure test for BTI support
@ 2020-07-02 8:38 Szabolcs Nagy
0 siblings, 0 replies; 2+ messages in thread
From: Szabolcs Nagy @ 2020-07-02 8:38 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3492d7d40821a9375baae96d053d3791f30d83f8
commit 3492d7d40821a9375baae96d053d3791f30d83f8
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Wed May 6 20:22:16 2020 +0100
aarch64: configure test for BTI support
Check BTI support in the compiler and linker. The check also
requires READELF that understands the BTI GNU property note.
It is expected to succeed with gcc >=gcc-9 configured with
--enable-standard-branch-protection and binutils >=binutils-2.33.
Note: passing -mbranch-protection=bti in CFLAGS when building glibc
may not be enough to get a glibc that supports BTI because crtbegin*
and crtend* provided by the compiler needs to be BTI compatible too.
Diff:
---
config.h.in | 3 +++
sysdeps/aarch64/configure | 42 ++++++++++++++++++++++++++++++++++++++++++
sysdeps/aarch64/configure.ac | 19 +++++++++++++++++++
3 files changed, 64 insertions(+)
diff --git a/config.h.in b/config.h.in
index 831eca2fe1..67169e5d01 100644
--- a/config.h.in
+++ b/config.h.in
@@ -109,6 +109,9 @@
/* AArch64 big endian ABI */
#undef HAVE_AARCH64_BE
+/* AArch64 BTI support enabled. */
+#define HAVE_AARCH64_BTI 0
+
/* C-SKY ABI version. */
#undef CSKYABI
diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
index 5bd355a691..70477a7fa5 100644
--- a/sysdeps/aarch64/configure
+++ b/sysdeps/aarch64/configure
@@ -172,3 +172,45 @@ else
config_vars="$config_vars
default-abi = lp64"
fi
+
+# Only consider BTI supported if -mbranch-protection=bti is
+# on by default in the compiler and the linker produces
+# binaries with GNU property notes in PT_GNU_PROPERTY segment.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for BTI support" >&5
+$as_echo_n "checking for BTI support... " >&6; }
+if ${libc_cv_aarch64_bti+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest.c <<EOF
+void foo (void) { }
+EOF
+ libc_cv_aarch64_bti=no
+ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o conftest.so conftest.c'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='$READELF -lW conftest.so | grep -q GNU_PROPERTY'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='$READELF -nW conftest.so | grep -q "NT_GNU_PROPERTY_TYPE_0.*AArch64 feature:.* BTI"'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+ then
+ libc_cv_aarch64_bti=yes
+ fi
+ rm -rf conftest.*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_aarch64_bti" >&5
+$as_echo "$libc_cv_aarch64_bti" >&6; }
+if test $libc_cv_aarch64_bti = yes; then
+ $as_echo "#define HAVE_AARCH64_BTI 1" >>confdefs.h
+
+fi
diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
index 7851dd4dac..798f494740 100644
--- a/sysdeps/aarch64/configure.ac
+++ b/sysdeps/aarch64/configure.ac
@@ -20,3 +20,22 @@ if test $libc_cv_aarch64_be = yes; then
else
LIBC_CONFIG_VAR([default-abi], [lp64])
fi
+
+# Only consider BTI supported if -mbranch-protection=bti is
+# on by default in the compiler and the linker produces
+# binaries with GNU property notes in PT_GNU_PROPERTY segment.
+AC_CACHE_CHECK([for BTI support], [libc_cv_aarch64_bti], [dnl
+ cat > conftest.c <<EOF
+void foo (void) { }
+EOF
+ libc_cv_aarch64_bti=no
+ if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o conftest.so conftest.c]) \
+ && AC_TRY_COMMAND([$READELF -lW conftest.so | grep -q GNU_PROPERTY]) \
+ && AC_TRY_COMMAND([$READELF -nW conftest.so | grep -q "NT_GNU_PROPERTY_TYPE_0.*AArch64 feature:.* BTI"])
+ then
+ libc_cv_aarch64_bti=yes
+ fi
+ rm -rf conftest.*])
+if test $libc_cv_aarch64_bti = yes; then
+ AC_DEFINE(HAVE_AARCH64_BTI)
+fi
^ permalink raw reply [flat|nested] 2+ messages in thread
* [glibc/nsz/pacbti-v6] aarch64: configure test for BTI support
@ 2020-07-01 14:32 Szabolcs Nagy
0 siblings, 0 replies; 2+ messages in thread
From: Szabolcs Nagy @ 2020-07-01 14:32 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cf32244b586222b0ab68e3b49d7394c35d00dea5
commit cf32244b586222b0ab68e3b49d7394c35d00dea5
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Wed May 6 20:22:16 2020 +0100
aarch64: configure test for BTI support
Check BTI support in the compiler and linker. The check also
requires READELF that understands the BTI GNU property note.
It is expected to succeed with gcc >=gcc-9 configured with
--enable-standard-branch-protection and binutils >=binutils-2.33.
Note: passing -mbranch-protection=bti in CFLAGS when building glibc
may not be enough to get a glibc that supports BTI because crtbegin*
and crtend* provided by the compiler needs to be BTI compatible too.
Diff:
---
config.h.in | 3 +++
sysdeps/aarch64/configure | 42 ++++++++++++++++++++++++++++++++++++++++++
sysdeps/aarch64/configure.ac | 19 +++++++++++++++++++
3 files changed, 64 insertions(+)
diff --git a/config.h.in b/config.h.in
index 831eca2fe1..67169e5d01 100644
--- a/config.h.in
+++ b/config.h.in
@@ -109,6 +109,9 @@
/* AArch64 big endian ABI */
#undef HAVE_AARCH64_BE
+/* AArch64 BTI support enabled. */
+#define HAVE_AARCH64_BTI 0
+
/* C-SKY ABI version. */
#undef CSKYABI
diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
index 5bd355a691..70477a7fa5 100644
--- a/sysdeps/aarch64/configure
+++ b/sysdeps/aarch64/configure
@@ -172,3 +172,45 @@ else
config_vars="$config_vars
default-abi = lp64"
fi
+
+# Only consider BTI supported if -mbranch-protection=bti is
+# on by default in the compiler and the linker produces
+# binaries with GNU property notes in PT_GNU_PROPERTY segment.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for BTI support" >&5
+$as_echo_n "checking for BTI support... " >&6; }
+if ${libc_cv_aarch64_bti+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest.c <<EOF
+void foo (void) { }
+EOF
+ libc_cv_aarch64_bti=no
+ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o conftest.so conftest.c'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='$READELF -lW conftest.so | grep -q GNU_PROPERTY'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='$READELF -nW conftest.so | grep -q "NT_GNU_PROPERTY_TYPE_0.*AArch64 feature:.* BTI"'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+ then
+ libc_cv_aarch64_bti=yes
+ fi
+ rm -rf conftest.*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_aarch64_bti" >&5
+$as_echo "$libc_cv_aarch64_bti" >&6; }
+if test $libc_cv_aarch64_bti = yes; then
+ $as_echo "#define HAVE_AARCH64_BTI 1" >>confdefs.h
+
+fi
diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
index 7851dd4dac..798f494740 100644
--- a/sysdeps/aarch64/configure.ac
+++ b/sysdeps/aarch64/configure.ac
@@ -20,3 +20,22 @@ if test $libc_cv_aarch64_be = yes; then
else
LIBC_CONFIG_VAR([default-abi], [lp64])
fi
+
+# Only consider BTI supported if -mbranch-protection=bti is
+# on by default in the compiler and the linker produces
+# binaries with GNU property notes in PT_GNU_PROPERTY segment.
+AC_CACHE_CHECK([for BTI support], [libc_cv_aarch64_bti], [dnl
+ cat > conftest.c <<EOF
+void foo (void) { }
+EOF
+ libc_cv_aarch64_bti=no
+ if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o conftest.so conftest.c]) \
+ && AC_TRY_COMMAND([$READELF -lW conftest.so | grep -q GNU_PROPERTY]) \
+ && AC_TRY_COMMAND([$READELF -nW conftest.so | grep -q "NT_GNU_PROPERTY_TYPE_0.*AArch64 feature:.* BTI"])
+ then
+ libc_cv_aarch64_bti=yes
+ fi
+ rm -rf conftest.*])
+if test $libc_cv_aarch64_bti = yes; then
+ AC_DEFINE(HAVE_AARCH64_BTI)
+fi
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2020-07-02 8:38 UTC | newest]
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