target/riscv: hardwire mstatus.FS to zero when enable zfinx

Co-authored-by: ardxwe <ardxwe@gmail.com>
Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20220211043920.28981-3-liweiwei@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/translate.c

@@ -426,6 +426,10 @@ static void mark_fs_dirty(DisasContext *ctx)
 {
     TCGv tmp;
 
+    if (!has_ext(ctx, RVF)) {
+        return;
+    }
+
     if (ctx->mstatus_fs != MSTATUS_FS) {
         /* Remember the state change for the rest of the TB. */
         ctx->mstatus_fs = MSTATUS_FS;