diff options
Diffstat (limited to 'qemu/target-s390x/int_helper.c')
| -rw-r--r-- | qemu/target-s390x/int_helper.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/qemu/target-s390x/int_helper.c b/qemu/target-s390x/int_helper.c new file mode 100644 index 000000000..a46c736d6 --- /dev/null +++ b/qemu/target-s390x/int_helper.c @@ -0,0 +1,154 @@ +/* + * S/390 integer 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 "qemu/host-utils.h" +#include "exec/helper-proto.h" + +/* #define DEBUG_HELPER */ +#ifdef DEBUG_HELPER +#define HELPER_LOG(x...) qemu_log(x) +#else +#define HELPER_LOG(x...) +#endif + +/* 64/32 -> 32 signed division */ +int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64) +{ + int32_t ret, b = b64; + int64_t q; + + if (b == 0) { + runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC()); + } + + ret = q = a / b; + env->retxl = a % b; + + /* Catch non-representable quotient. */ + if (ret != q) { + runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC()); + } + + return ret; +} + +/* 64/32 -> 32 unsigned division */ +uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64) +{ + uint32_t ret, b = b64; + uint64_t q; + + if (b == 0) { + runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC()); + } + + ret = q = a / b; + env->retxl = a % b; + + /* Catch non-representable quotient. */ + if (ret != q) { + runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC()); + } + + return ret; +} + +/* 64/64 -> 64 signed division */ +int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b) +{ + /* Catch divide by zero, and non-representable quotient (MIN / -1). */ + if (b == 0 || (b == -1 && a == (1ll << 63))) { + runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC()); + } + env->retxl = a % b; + return a / b; +} + +/* 128 -> 64/64 unsigned division */ +uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t b) +{ + uint64_t ret; + /* Signal divide by zero. */ + if (b == 0) { + runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC()); + } + if (ah == 0) { + /* 64 -> 64/64 case */ + env->retxl = al % b; + ret = al / b; + } else { + /* ??? Move i386 idivq helper to host-utils. */ +#ifdef CONFIG_INT128 + __uint128_t a = ((__uint128_t)ah << 64) | al; + __uint128_t q = a / b; + env->retxl = a % b; + ret = q; + if (ret != q) { + runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC()); + } +#else + S390CPU *cpu = s390_env_get_cpu(env); + /* 32-bit hosts would need special wrapper functionality - just abort if + we encounter such a case; it's very unlikely anyways. */ + cpu_abort(CPU(cpu), "128 -> 64/64 division not implemented\n"); +#endif + } + return ret; +} + +/* count leading zeros, for find leftmost one */ +uint64_t HELPER(clz)(uint64_t v) +{ + return clz64(v); +} + +uint64_t HELPER(cvd)(int32_t reg) +{ + /* positive 0 */ + uint64_t dec = 0x0c; + int64_t bin = reg; + int shift; + + if (bin < 0) { + bin = -bin; + dec = 0x0d; + } + + for (shift = 4; (shift < 64) && bin; shift += 4) { + dec |= (bin % 10) << shift; + bin /= 10; + } + + return dec; +} + +uint64_t HELPER(popcnt)(uint64_t r2) +{ + uint64_t ret = 0; + int i; + + for (i = 0; i < 64; i += 8) { + uint64_t t = ctpop32((r2 >> i) & 0xff); + ret |= t << i; + } + return ret; +} |