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Fix check for .cfi_negate_ra_state on aarch64 #18262

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Merged
behlendorf merged 1 commit into from
Mar 6, 2026
+38 −4
Merged

Fix check for .cfi_negate_ra_state on aarch64 #18262

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33 changes: 33 additions & 0 deletions config/toolchain-cfi.m4
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Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@
dnl # SPDX-License-Identifier: CDDL-1.0
dnl #
dnl # Check whether assembler supports .cfi_negate_ra_state on AArch64.
dnl #

AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_TOOLCHAIN_CFI_PSEUDO_OP], [
case "$host_cpu" in
aarch64*)
AC_CACHE_CHECK([whether assembler supports .cfi_negate_ra_state],
[zfs_cv_as_cfi_pseudo_op], [
cat > conftest.S <<_ACEOF
.text
conftest:
.cfi_startproc
.cfi_negate_ra_state
ret
.cfi_endproc
_ACEOF
if AC_TRY_COMMAND([$CC -c $CFLAGS $CPPFLAGS conftest.S -o conftest.o]) >/dev/null 2>&1; then
zfs_cv_as_cfi_pseudo_op=yes
else
zfs_cv_as_cfi_pseudo_op=no
fi
rm -f conftest.S conftest.o
])
AS_IF([test "x$zfs_cv_as_cfi_pseudo_op" = xyes], [
AC_DEFINE([HAVE_AS_CFI_PSEUDO_OP], 1,
[Define if your assembler supports .cfi_negate_ra_state.])
])
;;
esac
])
1 change: 1 addition & 0 deletions config/zfs-build.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -266,6 +266,7 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
ZFS_AC_CONFIG_ALWAYS_CC_ASAN
ZFS_AC_CONFIG_ALWAYS_CC_UBSAN
ZFS_AC_TOOLCHAIN_SIMD
ZFS_AC_CONFIG_ALWAYS_TOOLCHAIN_CFI_PSEUDO_OP
ZFS_AC_CONFIG_ALWAYS_SYSTEM
ZFS_AC_CONFIG_ALWAYS_ARCH
ZFS_AC_CONFIG_CHECK_ARCH_VAR
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4 changes: 2 additions & 2 deletions module/icp/asm-aarch64/blake3/b3_aarch64_sse2.S
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Expand Up @@ -34,8 +34,8 @@

#if defined(__aarch64__)

/* make gcc <= 9 happy */
#if !defined(LD_VERSION) || LD_VERSION >= 233010000
/* check for .cfi_negate_ra_state assembler support */
#if defined(HAVE_AS_CFI_PSEUDO_OP)
#define CFI_NEGATE_RA_STATE .cfi_negate_ra_state
#else
#define CFI_NEGATE_RA_STATE
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4 changes: 2 additions & 2 deletions module/icp/asm-aarch64/blake3/b3_aarch64_sse41.S
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Original file line number Diff line number Diff line change
Expand Up @@ -34,8 +34,8 @@

#if defined(__aarch64__)

/* make gcc <= 9 happy */
#if !defined(LD_VERSION) || LD_VERSION >= 233010000
/* check for .cfi_negate_ra_state assembler support */
#if defined(HAVE_AS_CFI_PSEUDO_OP)
#define CFI_NEGATE_RA_STATE .cfi_negate_ra_state
#else
#define CFI_NEGATE_RA_STATE
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