target/mips: Replace gen_exception_end(EXCP_RI) by gen_rsvd_instruction
[qemu/ar7.git] / target / s390x / int_helper.c
blob658507dd6de4c45b069c224ab068f6fe0109f316
1 /*
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 2.1 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"
22 #include "cpu.h"
23 #include "internal.h"
24 #include "tcg_s390x.h"
25 #include "exec/exec-all.h"
26 #include "qemu/host-utils.h"
27 #include "exec/helper-proto.h"
29 /* #define DEBUG_HELPER */
30 #ifdef DEBUG_HELPER
31 #define HELPER_LOG(x...) qemu_log(x)
32 #else
33 #define HELPER_LOG(x...)
34 #endif
36 /* 64/32 -> 32 signed division */
37 int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
39 int32_t ret, b = b64;
40 int64_t q;
42 if (b == 0) {
43 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
46 ret = q = a / b;
47 env->retxl = a % b;
49 /* Catch non-representable quotient. */
50 if (ret != q) {
51 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
54 return ret;
57 /* 64/32 -> 32 unsigned division */
58 uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
60 uint32_t ret, b = b64;
61 uint64_t q;
63 if (b == 0) {
64 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
67 ret = q = a / b;
68 env->retxl = a % b;
70 /* Catch non-representable quotient. */
71 if (ret != q) {
72 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
75 return ret;
78 /* 64/64 -> 64 signed division */
79 int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
81 /* Catch divide by zero, and non-representable quotient (MIN / -1). */
82 if (b == 0 || (b == -1 && a == (1ll << 63))) {
83 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
85 env->retxl = a % b;
86 return a / b;
89 /* 128 -> 64/64 unsigned division */
90 uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
91 uint64_t b)
93 uint64_t ret;
94 /* Signal divide by zero. */
95 if (b == 0) {
96 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
98 if (ah == 0) {
99 /* 64 -> 64/64 case */
100 env->retxl = al % b;
101 ret = al / b;
102 } else {
103 /* ??? Move i386 idivq helper to host-utils. */
104 #ifdef CONFIG_INT128
105 __uint128_t a = ((__uint128_t)ah << 64) | al;
106 __uint128_t q = a / b;
107 env->retxl = a % b;
108 ret = q;
109 if (ret != q) {
110 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
112 #else
113 /* 32-bit hosts would need special wrapper functionality - just abort if
114 we encounter such a case; it's very unlikely anyways. */
115 cpu_abort(env_cpu(env), "128 -> 64/64 division not implemented\n");
116 #endif
118 return ret;
121 uint64_t HELPER(cvd)(int32_t reg)
123 /* positive 0 */
124 uint64_t dec = 0x0c;
125 int64_t bin = reg;
126 int shift;
128 if (bin < 0) {
129 bin = -bin;
130 dec = 0x0d;
133 for (shift = 4; (shift < 64) && bin; shift += 4) {
134 dec |= (bin % 10) << shift;
135 bin /= 10;
138 return dec;
141 uint64_t HELPER(popcnt)(uint64_t val)
143 /* Note that we don't fold past bytes. */
144 val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
145 val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
146 val = (val + (val >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
147 return val;