| /* |
| * 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 "helper.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) |
| { |
| /* We had borrow-in if normal subtraction isn't equal. */ |
| int borrow_in = ar - (a1 - a2); |
| int borrow_out; |
| |
| /* If a2 was ULONG_MAX, and borrow_in, then a2 is logically 65 bits, |
| and we must have had borrow out. */ |
| if (borrow_in && a2 == (uint64_t)-1) { |
| borrow_out = 1; |
| } else { |
| a2 += borrow_in; |
| 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 1; |
| } 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) |
| { |
| /* We had borrow-in if normal subtraction isn't equal. */ |
| int borrow_in = ar - (a1 - a2); |
| int borrow_out; |
| |
| /* If a2 was UINT_MAX, and borrow_in, then a2 is logically 65 bits, |
| and we must have had borrow out. */ |
| if (borrow_in && a2 == (uint32_t)-1) { |
| borrow_out = 1; |
| } else { |
| a2 += borrow_in; |
| 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 1; |
| } 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) |
| { |
| 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(env, "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(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 |
