diff options
Diffstat (limited to 'qemu/target-s390x/cc_helper.c')
| -rw-r--r-- | qemu/target-s390x/cc_helper.c | 568 |
1 files changed, 568 insertions, 0 deletions
diff --git a/qemu/target-s390x/cc_helper.c b/qemu/target-s390x/cc_helper.c new file mode 100644 index 000000000..bfce3f1e6 --- /dev/null +++ b/qemu/target-s390x/cc_helper.c @@ -0,0 +1,568 @@ +/* + * 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 |