--- /dev/null
+/*
+ * S/390 condition code helper routines
+ *
+ * Copyright (c) 2009 Ulrich Hecht
+ * Copyright (c) 2009 Alexander Graf
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "qemu/host-utils.h"
+
+/* #define DEBUG_HELPER */
+#ifdef DEBUG_HELPER
+#define HELPER_LOG(x...) qemu_log(x)
+#else
+#define HELPER_LOG(x...)
+#endif
+
+static uint32_t cc_calc_ltgt_32(int32_t src, int32_t dst)
+{
+ if (src == dst) {
+ return 0;
+ } else if (src < dst) {
+ return 1;
+ } else {
+ return 2;
+ }
+}
+
+static uint32_t cc_calc_ltgt0_32(int32_t dst)
+{
+ return cc_calc_ltgt_32(dst, 0);
+}
+
+static uint32_t cc_calc_ltgt_64(int64_t src, int64_t dst)
+{
+ if (src == dst) {
+ return 0;
+ } else if (src < dst) {
+ return 1;
+ } else {
+ return 2;
+ }
+}
+
+static uint32_t cc_calc_ltgt0_64(int64_t dst)
+{
+ return cc_calc_ltgt_64(dst, 0);
+}
+
+static uint32_t cc_calc_ltugtu_32(uint32_t src, uint32_t dst)
+{
+ if (src == dst) {
+ return 0;
+ } else if (src < dst) {
+ return 1;
+ } else {
+ return 2;
+ }
+}
+
+static uint32_t cc_calc_ltugtu_64(uint64_t src, uint64_t dst)
+{
+ if (src == dst) {
+ return 0;
+ } else if (src < dst) {
+ return 1;
+ } else {
+ return 2;
+ }
+}
+
+static uint32_t cc_calc_tm_32(uint32_t val, uint32_t mask)
+{
+ uint32_t r = val & mask;
+
+ if (r == 0) {
+ return 0;
+ } else if (r == mask) {
+ return 3;
+ } else {
+ return 1;
+ }
+}
+
+static uint32_t cc_calc_tm_64(uint64_t val, uint64_t mask)
+{
+ uint64_t r = val & mask;
+
+ if (r == 0) {
+ return 0;
+ } else if (r == mask) {
+ return 3;
+ } else {
+ int top = clz64(mask);
+ if ((int64_t)(val << top) < 0) {
+ return 2;
+ } else {
+ return 1;
+ }
+ }
+}
+
+static uint32_t cc_calc_nz(uint64_t dst)
+{
+ return !!dst;
+}
+
+static uint32_t cc_calc_add_64(int64_t a1, int64_t a2, int64_t ar)
+{
+ if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
+ return 3; /* overflow */
+ } else {
+ if (ar < 0) {
+ return 1;
+ } else if (ar > 0) {
+ return 2;
+ } else {
+ return 0;
+ }
+ }
+}
+
+static uint32_t cc_calc_addu_64(uint64_t a1, uint64_t a2, uint64_t ar)
+{
+ return (ar != 0) + 2 * (ar < a1);
+}
+
+static uint32_t cc_calc_addc_64(uint64_t a1, uint64_t a2, uint64_t ar)
+{
+ /* Recover a2 + carry_in. */
+ uint64_t a2c = ar - a1;
+ /* Check for a2+carry_in overflow, then a1+a2c overflow. */
+ int carry_out = (a2c < a2) || (ar < a1);
+
+ return (ar != 0) + 2 * carry_out;
+}
+
+static uint32_t cc_calc_sub_64(int64_t a1, int64_t a2, int64_t ar)
+{
+ if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
+ return 3; /* overflow */
+ } else {
+ if (ar < 0) {
+ return 1;
+ } else if (ar > 0) {
+ return 2;
+ } else {
+ return 0;
+ }
+ }
+}
+
+static uint32_t cc_calc_subu_64(uint64_t a1, uint64_t a2, uint64_t ar)
+{
+ if (ar == 0) {
+ return 2;
+ } else {
+ if (a2 > a1) {
+ return 1;
+ } else {
+ return 3;
+ }
+ }
+}
+
+static uint32_t cc_calc_subb_64(uint64_t a1, uint64_t a2, uint64_t ar)
+{
+ int borrow_out;
+
+ if (ar != a1 - a2) { /* difference means borrow-in */
+ borrow_out = (a2 >= a1);
+ } else {
+ borrow_out = (a2 > a1);
+ }
+
+ return (ar != 0) + 2 * !borrow_out;
+}
+
+static uint32_t cc_calc_abs_64(int64_t dst)
+{
+ if ((uint64_t)dst == 0x8000000000000000ULL) {
+ return 3;
+ } else if (dst) {
+ return 2;
+ } else {
+ return 0;
+ }
+}
+
+static uint32_t cc_calc_nabs_64(int64_t dst)
+{
+ return !!dst;
+}
+
+static uint32_t cc_calc_comp_64(int64_t dst)
+{
+ if ((uint64_t)dst == 0x8000000000000000ULL) {
+ return 3;
+ } else if (dst < 0) {
+ return 1;
+ } else if (dst > 0) {
+ return 2;
+ } else {
+ return 0;
+ }
+}
+
+
+static uint32_t cc_calc_add_32(int32_t a1, int32_t a2, int32_t ar)
+{
+ if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
+ return 3; /* overflow */
+ } else {
+ if (ar < 0) {
+ return 1;
+ } else if (ar > 0) {
+ return 2;
+ } else {
+ return 0;
+ }
+ }
+}
+
+static uint32_t cc_calc_addu_32(uint32_t a1, uint32_t a2, uint32_t ar)
+{
+ return (ar != 0) + 2 * (ar < a1);
+}
+
+static uint32_t cc_calc_addc_32(uint32_t a1, uint32_t a2, uint32_t ar)
+{
+ /* Recover a2 + carry_in. */
+ uint32_t a2c = ar - a1;
+ /* Check for a2+carry_in overflow, then a1+a2c overflow. */
+ int carry_out = (a2c < a2) || (ar < a1);
+
+ return (ar != 0) + 2 * carry_out;
+}
+
+static uint32_t cc_calc_sub_32(int32_t a1, int32_t a2, int32_t ar)
+{
+ if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
+ return 3; /* overflow */
+ } else {
+ if (ar < 0) {
+ return 1;
+ } else if (ar > 0) {
+ return 2;
+ } else {
+ return 0;
+ }
+ }
+}
+
+static uint32_t cc_calc_subu_32(uint32_t a1, uint32_t a2, uint32_t ar)
+{
+ if (ar == 0) {
+ return 2;
+ } else {
+ if (a2 > a1) {
+ return 1;
+ } else {
+ return 3;
+ }
+ }
+}
+
+static uint32_t cc_calc_subb_32(uint32_t a1, uint32_t a2, uint32_t ar)
+{
+ int borrow_out;
+
+ if (ar != a1 - a2) { /* difference means borrow-in */
+ borrow_out = (a2 >= a1);
+ } else {
+ borrow_out = (a2 > a1);
+ }
+
+ return (ar != 0) + 2 * !borrow_out;
+}
+
+static uint32_t cc_calc_abs_32(int32_t dst)
+{
+ if ((uint32_t)dst == 0x80000000UL) {
+ return 3;
+ } else if (dst) {
+ return 2;
+ } else {
+ return 0;
+ }
+}
+
+static uint32_t cc_calc_nabs_32(int32_t dst)
+{
+ return !!dst;
+}
+
+static uint32_t cc_calc_comp_32(int32_t dst)
+{
+ if ((uint32_t)dst == 0x80000000UL) {
+ return 3;
+ } else if (dst < 0) {
+ return 1;
+ } else if (dst > 0) {
+ return 2;
+ } else {
+ return 0;
+ }
+}
+
+/* calculate condition code for insert character under mask insn */
+static uint32_t cc_calc_icm(uint64_t mask, uint64_t val)
+{
+ if ((val & mask) == 0) {
+ return 0;
+ } else {
+ int top = clz64(mask);
+ if ((int64_t)(val << top) < 0) {
+ return 1;
+ } else {
+ return 2;
+ }
+ }
+}
+
+static uint32_t cc_calc_sla_32(uint32_t src, int shift)
+{
+ uint32_t mask = ((1U << shift) - 1U) << (32 - shift);
+ uint32_t sign = 1U << 31;
+ uint32_t match;
+ int32_t r;
+
+ /* Check if the sign bit stays the same. */
+ if (src & sign) {
+ match = mask;
+ } else {
+ match = 0;
+ }
+ if ((src & mask) != match) {
+ /* Overflow. */
+ return 3;
+ }
+
+ r = ((src << shift) & ~sign) | (src & sign);
+ if (r == 0) {
+ return 0;
+ } else if (r < 0) {
+ return 1;
+ }
+ return 2;
+}
+
+static uint32_t cc_calc_sla_64(uint64_t src, int shift)
+{
+ uint64_t mask = ((1ULL << shift) - 1ULL) << (64 - shift);
+ uint64_t sign = 1ULL << 63;
+ uint64_t match;
+ int64_t r;
+
+ /* Check if the sign bit stays the same. */
+ if (src & sign) {
+ match = mask;
+ } else {
+ match = 0;
+ }
+ if ((src & mask) != match) {
+ /* Overflow. */
+ return 3;
+ }
+
+ r = ((src << shift) & ~sign) | (src & sign);
+ if (r == 0) {
+ return 0;
+ } else if (r < 0) {
+ return 1;
+ }
+ return 2;
+}
+
+static uint32_t cc_calc_flogr(uint64_t dst)
+{
+ return dst ? 2 : 0;
+}
+
+static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op,
+ uint64_t src, uint64_t dst, uint64_t vr)
+{
+ S390CPU *cpu = s390_env_get_cpu(env);
+ uint32_t r = 0;
+
+ switch (cc_op) {
+ case CC_OP_CONST0:
+ case CC_OP_CONST1:
+ case CC_OP_CONST2:
+ case CC_OP_CONST3:
+ /* cc_op value _is_ cc */
+ r = cc_op;
+ break;
+ case CC_OP_LTGT0_32:
+ r = cc_calc_ltgt0_32(dst);
+ break;
+ case CC_OP_LTGT0_64:
+ r = cc_calc_ltgt0_64(dst);
+ break;
+ case CC_OP_LTGT_32:
+ r = cc_calc_ltgt_32(src, dst);
+ break;
+ case CC_OP_LTGT_64:
+ r = cc_calc_ltgt_64(src, dst);
+ break;
+ case CC_OP_LTUGTU_32:
+ r = cc_calc_ltugtu_32(src, dst);
+ break;
+ case CC_OP_LTUGTU_64:
+ r = cc_calc_ltugtu_64(src, dst);
+ break;
+ case CC_OP_TM_32:
+ r = cc_calc_tm_32(src, dst);
+ break;
+ case CC_OP_TM_64:
+ r = cc_calc_tm_64(src, dst);
+ break;
+ case CC_OP_NZ:
+ r = cc_calc_nz(dst);
+ break;
+ case CC_OP_ADD_64:
+ r = cc_calc_add_64(src, dst, vr);
+ break;
+ case CC_OP_ADDU_64:
+ r = cc_calc_addu_64(src, dst, vr);
+ break;
+ case CC_OP_ADDC_64:
+ r = cc_calc_addc_64(src, dst, vr);
+ break;
+ case CC_OP_SUB_64:
+ r = cc_calc_sub_64(src, dst, vr);
+ break;
+ case CC_OP_SUBU_64:
+ r = cc_calc_subu_64(src, dst, vr);
+ break;
+ case CC_OP_SUBB_64:
+ r = cc_calc_subb_64(src, dst, vr);
+ break;
+ case CC_OP_ABS_64:
+ r = cc_calc_abs_64(dst);
+ break;
+ case CC_OP_NABS_64:
+ r = cc_calc_nabs_64(dst);
+ break;
+ case CC_OP_COMP_64:
+ r = cc_calc_comp_64(dst);
+ break;
+
+ case CC_OP_ADD_32:
+ r = cc_calc_add_32(src, dst, vr);
+ break;
+ case CC_OP_ADDU_32:
+ r = cc_calc_addu_32(src, dst, vr);
+ break;
+ case CC_OP_ADDC_32:
+ r = cc_calc_addc_32(src, dst, vr);
+ break;
+ case CC_OP_SUB_32:
+ r = cc_calc_sub_32(src, dst, vr);
+ break;
+ case CC_OP_SUBU_32:
+ r = cc_calc_subu_32(src, dst, vr);
+ break;
+ case CC_OP_SUBB_32:
+ r = cc_calc_subb_32(src, dst, vr);
+ break;
+ case CC_OP_ABS_32:
+ r = cc_calc_abs_32(dst);
+ break;
+ case CC_OP_NABS_32:
+ r = cc_calc_nabs_32(dst);
+ break;
+ case CC_OP_COMP_32:
+ r = cc_calc_comp_32(dst);
+ break;
+
+ case CC_OP_ICM:
+ r = cc_calc_icm(src, dst);
+ break;
+ case CC_OP_SLA_32:
+ r = cc_calc_sla_32(src, dst);
+ break;
+ case CC_OP_SLA_64:
+ r = cc_calc_sla_64(src, dst);
+ break;
+ case CC_OP_FLOGR:
+ r = cc_calc_flogr(dst);
+ break;
+
+ case CC_OP_NZ_F32:
+ r = set_cc_nz_f32(dst);
+ break;
+ case CC_OP_NZ_F64:
+ r = set_cc_nz_f64(dst);
+ break;
+ case CC_OP_NZ_F128:
+ r = set_cc_nz_f128(make_float128(src, dst));
+ break;
+
+ default:
+ cpu_abort(CPU(cpu), "Unknown CC operation: %s\n", cc_name(cc_op));
+ }
+
+ HELPER_LOG("%s: %15s 0x%016lx 0x%016lx 0x%016lx = %d\n", __func__,
+ cc_name(cc_op), src, dst, vr, r);
+ return r;
+}
+
+uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
+ uint64_t vr)
+{
+ return do_calc_cc(env, cc_op, src, dst, vr);
+}
+
+uint32_t HELPER(calc_cc)(CPUS390XState *env, uint32_t cc_op, uint64_t src,
+ uint64_t dst, uint64_t vr)
+{
+ return do_calc_cc(env, cc_op, src, dst, vr);
+}
+
+#ifndef CONFIG_USER_ONLY
+void HELPER(load_psw)(CPUS390XState *env, uint64_t mask, uint64_t addr)
+{
+ load_psw(env, mask, addr);
+ cpu_loop_exit(CPU(s390_env_get_cpu(env)));
+}
+
+void HELPER(sacf)(CPUS390XState *env, uint64_t a1)
+{
+ HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1);
+
+ switch (a1 & 0xf00) {
+ case 0x000:
+ env->psw.mask &= ~PSW_MASK_ASC;
+ env->psw.mask |= PSW_ASC_PRIMARY;
+ break;
+ case 0x100:
+ env->psw.mask &= ~PSW_MASK_ASC;
+ env->psw.mask |= PSW_ASC_SECONDARY;
+ break;
+ case 0x300:
+ env->psw.mask &= ~PSW_MASK_ASC;
+ env->psw.mask |= PSW_ASC_HOME;
+ break;
+ default:
+ qemu_log("unknown sacf mode: %" PRIx64 "\n", a1);
+ program_interrupt(env, PGM_SPECIFICATION, 2);
+ break;
+ }
+}
+#endif
Code Review / kvmfornfv.git / blobdiff