diff --git a/target-s390x/fpu_helper.c b/target-s390x/fpu_helper.c
index c632366..4dac096 100644
--- a/target-s390x/fpu_helper.c
+++ b/target-s390x/fpu_helper.c
@@ -213,27 +213,31 @@ uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al,
     return RET128(ret);
 }
 
-/* 32-bit FP subtraction RR */
-uint32_t HELPER(sebr)(CPUS390XState *env, uint32_t f1, uint32_t f2)
+/* 32-bit FP subtraction */
+uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 {
-    env->fregs[f1].l.upper = float32_sub(env->fregs[f1].l.upper,
-                                         env->fregs[f2].l.upper,
-                                         &env->fpu_status);
-    HELPER_LOG("%s: adding 0x%d resulting in 0x%d in f%d\n", __func__,
-               env->fregs[f2].l.upper, env->fregs[f1].l.upper, f1);
-
-    return set_cc_nz_f32(env->fregs[f1].l.upper);
+    float32 ret = float32_sub(f1, f2, &env->fpu_status);
+    handle_exceptions(env, GETPC());
+    return ret;
 }
 
-/* 64-bit FP subtraction RR */
-uint32_t HELPER(sdbr)(CPUS390XState *env, uint32_t f1, uint32_t f2)
+/* 64-bit FP subtraction */
+uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 {
-    env->fregs[f1].d = float64_sub(env->fregs[f1].d, env->fregs[f2].d,
-                                   &env->fpu_status);
-    HELPER_LOG("%s: subtracting 0x%ld resulting in 0x%ld in f%d\n",
-               __func__, env->fregs[f2].d, env->fregs[f1].d, f1);
+    float64 ret = float64_sub(f1, f2, &env->fpu_status);
+    handle_exceptions(env, GETPC());
+    return ret;
+}
 
-    return set_cc_nz_f64(env->fregs[f1].d);
+/* 128-bit FP subtraction */
+uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
+                     uint64_t bh, uint64_t bl)
+{
+    float128 ret = float128_sub(make_float128(ah, al),
+                                make_float128(bh, bl),
+                                &env->fpu_status);
+    handle_exceptions(env, GETPC());
+    return RET128(ret);
 }
 
 /* 32-bit FP division RR */
@@ -447,27 +451,6 @@ uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
     return float_comp_to_cc(env, cmp);
 }
 
-/* 32-bit FP subtraction RM */
-void HELPER(seb)(CPUS390XState *env, uint32_t f1, uint32_t val)
-{
-    float32 v1 = env->fregs[f1].l.upper;
-    CPU_FloatU v2;
-
-    v2.l = val;
-    env->fregs[f1].l.upper = float32_sub(v1, v2.f, &env->fpu_status);
-}
-
-/* 64-bit FP subtraction RM */
-uint32_t HELPER(sdb)(CPUS390XState *env, uint32_t f1, uint64_t a2)
-{
-    float64 v1 = env->fregs[f1].d;
-    CPU_DoubleU v2;
-
-    v2.ll = cpu_ldq_data(env, a2);
-    env->fregs[f1].d = v1 = float64_sub(v1, v2.d, &env->fpu_status);
-    return set_cc_nz_f64(v1);
-}
-
 /* 64-bit FP multiplication RM */
 void HELPER(mdb)(CPUS390XState *env, uint32_t f1, uint64_t a2)
 {
@@ -621,23 +604,6 @@ void HELPER(lzxr)(CPUS390XState *env, uint32_t f1)
     env->fregs[f1 + 1].ll = x.ll.lower;
 }
 
-/* 128-bit FP subtraction RR */
-uint32_t HELPER(sxbr)(CPUS390XState *env, uint32_t f1, uint32_t f2)
-{
-    CPU_QuadU v1;
-    CPU_QuadU v2;
-    CPU_QuadU res;
-
-    v1.ll.upper = env->fregs[f1].ll;
-    v1.ll.lower = env->fregs[f1 + 2].ll;
-    v2.ll.upper = env->fregs[f2].ll;
-    v2.ll.lower = env->fregs[f2 + 2].ll;
-    res.q = float128_sub(v1.q, v2.q, &env->fpu_status);
-    env->fregs[f1].ll = res.ll.upper;
-    env->fregs[f1 + 2].ll = res.ll.lower;
-    return set_cc_nz_f128(res.q);
-}
-
 /* 32-bit FP multiplication RR */
 void HELPER(meebr)(CPUS390XState *env, uint32_t f1, uint32_t f2)
 {
diff --git a/target-s390x/helper.h b/target-s390x/helper.h
index 244c6ca..b3f5a40 100644
--- a/target-s390x/helper.h
+++ b/target-s390x/helper.h
@@ -50,8 +50,9 @@ DEF_HELPER_3(cxgbr, void, env, i32, s64)
 DEF_HELPER_3(aeb, i64, env, i64, i64)
 DEF_HELPER_3(adb, i64, env, i64, i64)
 DEF_HELPER_5(axb, i64, env, i64, i64, i64, i64)
-DEF_HELPER_3(sebr, i32, env, i32, i32)
-DEF_HELPER_3(sdbr, i32, env, i32, i32)
+DEF_HELPER_3(seb, i64, env, i64, i64)
+DEF_HELPER_3(sdb, i64, env, i64, i64)
+DEF_HELPER_5(sxb, i64, env, i64, i64, i64, i64)
 DEF_HELPER_3(debr, void, env, i32, i32)
 DEF_HELPER_3(dxbr, void, env, i32, i32)
 DEF_HELPER_3(mdbr, void, env, i32, i32)
@@ -70,8 +71,6 @@ DEF_HELPER_3(lcdbr, i32, env, i32, i32)
 DEF_HELPER_3(lcxbr, i32, env, i32, i32)
 DEF_HELPER_3(deb, void, env, i32, i32)
 DEF_HELPER_3(meeb, void, env, i32, i32)
-DEF_HELPER_3(seb, void, env, i32, i32)
-DEF_HELPER_3(sdb, i32, env, i32, i64)
 DEF_HELPER_3(mdb, void, env, i32, i64)
 DEF_HELPER_3(ddb, void, env, i32, i64)
 DEF_HELPER_FLAGS_3(ceb, TCG_CALL_PURE, i32, env, i64, i64)
@@ -86,7 +85,6 @@ DEF_HELPER_2(lzxr, void, env, i32)
 DEF_HELPER_4(cfebr, i32, env, i32, i32, i32)
 DEF_HELPER_4(cfdbr, i32, env, i32, i32, i32)
 DEF_HELPER_4(cfxbr, i32, env, i32, i32, i32)
-DEF_HELPER_3(sxbr, i32, env, i32, i32)
 DEF_HELPER_3(meebr, void, env, i32, i32)
 DEF_HELPER_3(ddbr, void, env, i32, i32)
 DEF_HELPER_4(madb, void, env, i32, i64, i32)
diff --git a/target-s390x/insn-data.def b/target-s390x/insn-data.def
index 1709cbf..9b02904 100644
--- a/target-s390x/insn-data.def
+++ b/target-s390x/insn-data.def
@@ -476,6 +476,11 @@
     C(0xb9e9, SGRK,    RRF_a, DO,  r2, r3, r1, 0, sub, subs64)
     C(0xe309, SG,      RXY_a, Z,   r1, m2_64, r1, 0, sub, subs64)
     C(0xe319, SGF,     RXY_a, Z,   r1, m2_32s, r1, 0, sub, subs64)
+    C(0xb30b, SEBR,    RRE,   Z,   e1, e2, new, e1, seb, f32)
+    C(0xb31b, SDBR,    RRE,   Z,   f1_o, f2_o, f1, 0, sdb, f64)
+    C(0xb34b, SXBR,    RRE,   Z,   0, x2_o, x1, 0, sxb, f128)
+    C(0xed0b, SEB,     RXE,   Z,   e1, m2_32u, new, e1, seb, f32)
+    C(0xed1b, SDB,     RXE,   Z,   f1_o, m2_64, f1, 0, sdb, f64)
 /* SUBTRACT HALFWORD */
     C(0x4b00, SH,      RX_a,  Z,   r1, m2_16s, new, r1_32, sub, subs32)
     C(0xe37b, SHY,     RXY_a, LD,  r1, m2_16s, new, r1_32, sub, subs32)
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index 3d5668d..2ed8b2c 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -554,11 +554,6 @@ static inline void set_cc_s64(DisasContext *s, TCGv_i64 val)
     gen_op_update1_cc_i64(s, CC_OP_LTGT0_64, val);
 }
 
-static void gen_set_cc_nz_f32(DisasContext *s, TCGv_i32 v1)
-{
-    gen_op_update1_cc_i32(s, CC_OP_NZ_F32, v1);
-}
-
 /* CC value is in env->cc_op */
 static inline void set_cc_static(DisasContext *s)
 {
@@ -998,19 +993,6 @@ static void disas_ed(DisasContext *s, int op, int r1, int x2, int b2, int d2,
     addr = get_address(s, x2, b2, d2);
     tmp_r1 = tcg_const_i32(r1);
     switch (op) {
-    case 0xb: /* SEB    R1,D2(X2,B2)       [RXE] */
-        tmp = tcg_temp_new_i64();
-        tmp32 = tcg_temp_new_i32();
-        tcg_gen_qemu_ld32u(tmp, addr, get_mem_index(s));
-        tcg_gen_trunc_i64_i32(tmp32, tmp);
-        gen_helper_seb(cpu_env, tmp_r1, tmp32);
-        tcg_temp_free_i64(tmp);
-        tcg_temp_free_i32(tmp32);
-
-        tmp32 = load_freg32(r1);
-        gen_set_cc_nz_f32(s, tmp32);
-        tcg_temp_free_i32(tmp32);
-        break;
     case 0xd: /* DEB    R1,D2(X2,B2)       [RXE] */
         tmp = tcg_temp_new_i64();
         tmp32 = tcg_temp_new_i32();
@@ -1044,11 +1026,6 @@ static void disas_ed(DisasContext *s, int op, int r1, int x2, int b2, int d2,
         tcg_temp_free_i64(tmp);
         tcg_temp_free_i32(tmp32);
         break;
-    case 0x1b: /* SDB    R1,D2(X2,B2)       [RXE] */
-        potential_page_fault(s);
-        gen_helper_sdb(cc_op, cpu_env, tmp_r1, addr);
-        set_cc_static(s);
-        break;
     case 0x1c: /* MDB    R1,D2(X2,B2)       [RXE] */
         potential_page_fault(s);
         gen_helper_mdb(cpu_env, tmp_r1, addr);
@@ -1475,9 +1452,6 @@ static void disas_b3(DisasContext *s, int op, int m3, int r1, int r2)
     case 0x3: /* LCEBR       R1,R2             [RRE] */
         FP_HELPER_CC(lcebr);
         break;
-    case 0xb: /* SEBR        R1,R2             [RRE] */
-        FP_HELPER_CC(sebr);
-        break;
     case 0xd: /* DEBR        R1,R2             [RRE] */
         FP_HELPER(debr);
         break;
@@ -1493,9 +1467,6 @@ static void disas_b3(DisasContext *s, int op, int m3, int r1, int r2)
     case 0x17: /* MEEBR       R1,R2             [RRE] */
         FP_HELPER(meebr);
         break;
-    case 0x1b: /* SDBR        R1,R2             [RRE] */
-        FP_HELPER_CC(sdbr);
-        break;
     case 0x1c: /* MDBR        R1,R2             [RRE] */
         FP_HELPER(mdbr);
         break;
@@ -1532,9 +1503,6 @@ static void disas_b3(DisasContext *s, int op, int m3, int r1, int r2)
     case 0x43: /* LCXBR       R1,R2             [RRE] */
         FP_HELPER_CC(lcxbr);
         break;
-    case 0x4b: /* SXBR        R1,R2             [RRE] */
-        FP_HELPER_CC(sxbr);
-        break;
     case 0x4c: /* MXBR        R1,R2             [RRE] */
         FP_HELPER(mxbr);
         break;
@@ -2892,6 +2860,25 @@ static ExitStatus op_rll64(DisasContext *s, DisasOps *o)
     return NO_EXIT;
 }
 
+static ExitStatus op_seb(DisasContext *s, DisasOps *o)
+{
+    gen_helper_seb(o->out, cpu_env, o->in1, o->in2);
+    return NO_EXIT;
+}
+
+static ExitStatus op_sdb(DisasContext *s, DisasOps *o)
+{
+    gen_helper_sdb(o->out, cpu_env, o->in1, o->in2);
+    return NO_EXIT;
+}
+
+static ExitStatus op_sxb(DisasContext *s, DisasOps *o)
+{
+    gen_helper_sxb(o->out, cpu_env, o->out, o->out2, o->in1, o->in2);
+    return_low128(o->out2);
+    return NO_EXIT;
+}
+
 #ifndef CONFIG_USER_ONLY
 static ExitStatus op_sigp(DisasContext *s, DisasOps *o)
 {
