target/microblaze: mbar: Add support for data-access barriers

Add support for data-access barriers.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

target/microblaze/translate.c

@@ -1233,6 +1233,11 @@ static void dec_br(DisasContext *dc)
 
         LOG_DIS("mbar %d\n", mbar_imm);
 
+        /* Data access memory barrier.  */
+        if ((mbar_imm & 2) == 0) {
+            tcg_gen_mb(TCG_BAR_SC | TCG_MO_ALL);
+        }
+
         /* mbar IMM & 16 decodes to sleep.  */
         if (mbar_imm & 16) {
             TCGv_i32 tmp_hlt = tcg_const_i32(EXCP_HLT);