2 * S/390 integer helper routines
4 * Copyright (c) 2009 Ulrich Hecht
5 * Copyright (c) 2009 Alexander Graf
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
21 #include "qemu/osdep.h"
23 #include "exec/exec-all.h"
24 #include "qemu/host-utils.h"
25 #include "exec/helper-proto.h"
27 /* #define DEBUG_HELPER */
29 #define HELPER_LOG(x...) qemu_log(x)
31 #define HELPER_LOG(x...)
34 /* 64/32 -> 32 signed division */
35 int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
41 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
47 /* Catch non-representable quotient. */
49 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
55 /* 64/32 -> 32 unsigned division */
56 uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
58 uint32_t ret, b = b64;
62 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
68 /* Catch non-representable quotient. */
70 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
76 /* 64/64 -> 64 signed division */
77 int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
79 /* Catch divide by zero, and non-representable quotient (MIN / -1). */
80 if (b == 0 || (b == -1 && a == (1ll << 63))) {
81 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
87 /* 128 -> 64/64 unsigned division */
88 uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
92 /* Signal divide by zero. */
94 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
97 /* 64 -> 64/64 case */
101 /* ??? Move i386 idivq helper to host-utils. */
103 __uint128_t a = ((__uint128_t)ah << 64) | al;
104 __uint128_t q = a / b;
108 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
111 S390CPU *cpu = s390_env_get_cpu(env);
112 /* 32-bit hosts would need special wrapper functionality - just abort if
113 we encounter such a case; it's very unlikely anyways. */
114 cpu_abort(CPU(cpu), "128 -> 64/64 division not implemented\n");
120 uint64_t HELPER(cvd)(int32_t reg)
132 for (shift = 4; (shift < 64) && bin; shift += 4) {
133 dec |= (bin % 10) << shift;
140 uint64_t HELPER(popcnt)(uint64_t val)
142 /* Note that we don't fold past bytes. */
143 val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
144 val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
145 val = (val + (val >> 4)) & 0x0f0f0f0f0f0f0f0fULL;