Use the new slow path for atomic instruction translation when the softmmu is enabled.
At the moment only arm and aarch64 use the new LL/SC backend. It is possible to disable such backed with --disable-arm-llsc-backend. Suggested-by: Jani Kokkonen <jani.kokko...@huawei.com> Suggested-by: Claudio Fontana <claudio.font...@huawei.com> Signed-off-by: Alvise Rigo <a.r...@virtualopensystems.com> --- configure | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/configure b/configure index 44ac9ab..915efcc 100755 --- a/configure +++ b/configure @@ -294,6 +294,7 @@ solaris="no" profiler="no" cocoa="no" softmmu="yes" +arm_tcg_use_llsc="yes" linux_user="no" bsd_user="no" aix="no" @@ -880,6 +881,10 @@ for opt do ;; --disable-debug-tcg) debug_tcg="no" ;; + --enable-arm-llsc-backend) arm_tcg_use_llsc="yes" + ;; + --disable-arm-llsc-backend) arm_tcg_use_llsc="no" + ;; --enable-debug) # Enable debugging options that aren't excessively noisy debug_tcg="yes" @@ -4751,6 +4756,7 @@ echo "host CPU $cpu" echo "host big endian $bigendian" echo "target list $target_list" echo "tcg debug enabled $debug_tcg" +echo "arm use llsc backend" $arm_tcg_use_llsc echo "gprof enabled $gprof" echo "sparse enabled $sparse" echo "strip binaries $strip_opt" @@ -4806,6 +4812,7 @@ echo "Install blobs $blobs" echo "KVM support $kvm" echo "RDMA support $rdma" echo "TCG interpreter $tcg_interpreter" +echo "use ld/st excl $softmmu" echo "fdt support $fdt" echo "preadv support $preadv" echo "fdatasync $fdatasync" @@ -5863,6 +5870,13 @@ fi echo "LDFLAGS+=$ldflags" >> $config_target_mak echo "QEMU_CFLAGS+=$cflags" >> $config_target_mak +# Use tcg LL/SC tcg backend for exclusive instruction is arm/aarch64 +# softmmus targets +if test "$arm_tcg_use_llsc" = "yes" ; then + if test "$target" = "arm-softmmu" ; then + echo "CONFIG_ARM_USE_LDST_EXCL=y" >> $config_target_mak + fi +fi done # for target in $targets if [ "$pixman" = "internal" ]; then -- 2.7.0