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aarch64: Add configure checks for GCS support 

- Add check that linker supports -z gcs=...
 - Add checks that main and test compiler support
   -mbranch-protection=gcs

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Yury Khrustalev 2025-01-28 16:13:51 +00:00
parent 6d24313e4a
commit c05086d904
2 changed files with 116 additions and 0 deletions
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99
configure vendored
View File

@ -8908,6 +8908,105 @@ printf "%s\n" "$libc_linker_feature" >&6; }
config_vars="$config_vars
load-address-ldflag = $libc_cv_load_address_ldflag"
# Check if compilers support GCS in branch protection:
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler supports -mbranch-protection=gcs" >&5
printf %s "checking if compiler supports -mbranch-protection=gcs... " >&6; }
if test ${libc_cv_cc_gcs+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) if { ac_try='${CC-cc} -Werror -mbranch-protection=gcs -xc /dev/null -S -o /dev/null'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then :
libc_cv_cc_gcs=yes
else case e in #(
e) libc_cv_cc_gcs=no ;;
esac
fi ;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_gcs" >&5
printf "%s\n" "$libc_cv_cc_gcs" >&6; }
if test "$TEST_CC" = "$CC"; then
libc_cv_test_cc_gcs=$libc_cv_cc_gcs
else
saved_CC="$CC"
CC="$TEST_CC"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler supports -mbranch-protection=gcs in testing" >&5
printf %s "checking if compiler supports -mbranch-protection=gcs in testing... " >&6; }
if test ${libc_cv_test_cc_gcs+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) if { ac_try='${CC-cc} -Werror -mbranch-protection=gcs -xc /dev/null -S -o /dev/null'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then :
libc_cv_test_cc_gcs=yes
else case e in #(
e) libc_cv_test_cc_gcs=no ;;
esac
fi ;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_cc_gcs" >&5
printf "%s\n" "$libc_cv_test_cc_gcs" >&6; }
CC="$saved_CC"
fi
config_vars="$config_vars
have-cc-gcs = $libc_cv_cc_gcs"
config_vars="$config_vars
have-test-cc-gcs = $libc_cv_test_cc_gcs"
# Check if linker supports GCS marking
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker that supports -z gcs=always" >&5
printf %s "checking for linker that supports -z gcs=always... " >&6; }
libc_linker_feature=no
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
-Wl,-z,gcs=always -nostdlib -nostartfiles
-fPIC -shared -o conftest.so conftest.c
1>&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -Wl,-z,gcs=always -nostdlib \
-nostartfiles -fPIC -shared -o conftest.so conftest.c 2>&1 \
| grep "warning: -z gcs=always ignored" > /dev/null 2>&1; then
true
else
libc_linker_feature=yes
fi
fi
rm -f conftest*
if test $libc_linker_feature = yes; then
libc_cv_ld_gcs=yes
else
libc_cv_ld_gcs=no
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5
printf "%s\n" "$libc_linker_feature" >&6; }
config_vars="$config_vars
have-ld-gcs = $libc_cv_ld_gcs"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if we can build programs as PIE" >&5
printf %s "checking if we can build programs as PIE... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext

17
configure.ac
View File

@ -1992,6 +1992,23 @@ LIBC_LINKER_FEATURE([-Ttext-segment=$libc_cv_pde_load_address],
[libc_cv_load_address_ldflag=])
LIBC_CONFIG_VAR([load-address-ldflag], [$libc_cv_load_address_ldflag])
# Check if compilers support GCS in branch protection:
LIBC_TRY_CC_AND_TEST_CC_OPTION([if compiler supports -mbranch-protection=gcs],
[-Werror -mbranch-protection=gcs],
libc_cv_cc_gcs,
[libc_cv_cc_gcs=yes],
[libc_cv_cc_gcs=no],
libc_cv_test_cc_gcs,
[libc_cv_test_cc_gcs=yes],
[libc_cv_test_cc_gcs=no])
LIBC_CONFIG_VAR([have-cc-gcs], [$libc_cv_cc_gcs])
LIBC_CONFIG_VAR([have-test-cc-gcs], [$libc_cv_test_cc_gcs])
# Check if linker supports GCS marking
LIBC_LINKER_FEATURE([-z gcs=always], [-Wl,-z,gcs=always],
[libc_cv_ld_gcs=yes], [libc_cv_ld_gcs=no])
LIBC_CONFIG_VAR([have-ld-gcs], [$libc_cv_ld_gcs])
AC_MSG_CHECKING(if we can build programs as PIE)
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifdef PIE_UNSUPPORTED
# error PIE is not supported