diff --git a/target-s390x/helper.h b/target-s390x/helper.h
index f2eaef4..5d8a821 100644
--- a/target-s390x/helper.h
+++ b/target-s390x/helper.h
@@ -80,7 +80,7 @@
 DEF_HELPER_FLAGS_2(sfpc, TCG_CALL_NO_RWG, void, env, i64)
 
 #ifndef CONFIG_USER_ONLY
-DEF_HELPER_3(servc, i32, env, i32, i64)
+DEF_HELPER_3(servc, i32, env, i64, i64)
 DEF_HELPER_4(diag, i64, env, i32, i64, i64)
 DEF_HELPER_3(load_psw, void, env, i64, i64)
 DEF_HELPER_FLAGS_2(spx, TCG_CALL_NO_RWG, void, env, i64)
diff --git a/target-s390x/insn-data.def b/target-s390x/insn-data.def
index b0cf908..cd773d0 100644
--- a/target-s390x/insn-data.def
+++ b/target-s390x/insn-data.def
@@ -641,6 +641,8 @@
     C(0xb20d, PTLB,    S,     Z,   0, 0, 0, 0, ptlb, 0)
 /* RESET REFERENCE BIT EXTENDED */
     C(0xb22a, RRBE,    RRE,   Z,   0, r2_o, 0, 0, rrbe, 0)
+/* SERVICE CALL LOGICAL PROCESSOR (PV hypercall) */
+    C(0xb220, SERVC,   RRE,   Z,   r1_o, r2_o, 0, 0, servc, 0)
 /* SET ADDRESSING MODE */
     /* We only do 64-bit, so accept this as a no-op.
        Let SAM24 and SAM31 signal illegal instruction.  */
diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c
index 60e6538..3015bfe 100644
--- a/target-s390x/misc_helper.c
+++ b/target-s390x/misc_helper.c
@@ -88,11 +88,9 @@
 }
 
 /* SCLP service call */
-uint32_t HELPER(servc)(CPUS390XState *env, uint32_t r1, uint64_t r2)
+uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
 {
-    int r;
-
-    r = sclp_service_call(r1, r2);
+    int r = sclp_service_call(r1, r2);
     if (r < 0) {
         program_interrupt(env, -r, 4);
         return 0;
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index 5472dfc..b4b197b 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -1022,27 +1022,7 @@
                      uint32_t insn)
 {
 #ifndef CONFIG_USER_ONLY
-    TCGv_i64 tmp;
-    TCGv_i32 tmp32_1;
-    int r1, r2;
-
-    r1 = (insn >> 4) & 0xf;
-    r2 = insn & 0xf;
-
-    LOG_DISAS("disas_b2: op 0x%x r1 %d r2 %d\n", op, r1, r2);
-
     switch (op) {
-    case 0x20: /* SERVC     R1,R2     [RRE] */
-        /* SCLP Service call (PV hypercall) */
-        check_privileged(s);
-        potential_page_fault(s);
-        tmp32_1 = load_reg32(r2);
-        tmp = load_reg(r1);
-        gen_helper_servc(cc_op, cpu_env, tmp32_1, tmp);
-        set_cc_static(s);
-        tcg_temp_free_i32(tmp32_1);
-        tcg_temp_free_i64(tmp);
-        break;
     default:
 #endif
         LOG_DISAS("illegal b2 operation 0x%x\n", op);
@@ -2701,6 +2681,15 @@
 }
 
 #ifndef CONFIG_USER_ONLY
+static ExitStatus op_servc(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_servc(cc_op, cpu_env, o->in2, o->in1);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
 static ExitStatus op_sigp(DisasContext *s, DisasOps *o)
 {
     TCGv_i32 r1 = tcg_const_i32(get_field(s->fields, r1));