diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 2ec02c8a5f..ee9dfa8e43 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -5346,6 +5346,21 @@ static void disas_data_proc_2src(DisasContext *s, uint32_t insn)
                                              cpu_reg_sp(s, rn));
         }
         break;
+    case 5: /* GMI */
+        if (sf == 0 || !dc_isar_feature(aa64_mte_insn_reg, s)) {
+            goto do_unallocated;
+        } else {
+            TCGv_i64 t1 = tcg_const_i64(1);
+            TCGv_i64 t2 = tcg_temp_new_i64();
+
+            tcg_gen_extract_i64(t2, cpu_reg_sp(s, rn), 56, 4);
+            tcg_gen_shl_i64(t1, t1, t2);
+            tcg_gen_or_i64(cpu_reg(s, rd), cpu_reg(s, rm), t1);
+
+            tcg_temp_free_i64(t1);
+            tcg_temp_free_i64(t2);
+        }
+        break;
     case 8: /* LSLV */
         handle_shift_reg(s, A64_SHIFT_TYPE_LSL, sf, rm, rn, rd);
         break;