Update version for v6.2.0-rc4 release
[qemu.git] / target / s390x / int_helper.c
1 /*
2 * S/390 integer helper routines
3 *
4 * Copyright (c) 2009 Ulrich Hecht
5 * Copyright (c) 2009 Alexander Graf
6 *
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.
11 *
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.
16 *
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/>.
19 */
20
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"
28
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
35
36 /* 64/32 -> 32 signed division */
37 int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
38 {
39 int32_t ret, b = b64;
40 int64_t q;
41
42 if (b == 0) {
43 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
44 }
45
46 ret = q = a / b;
47 env->retxl = a % b;
48
49 /* Catch non-representable quotient. */
50 if (ret != q) {
51 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
52 }
53
54 return ret;
55 }
56
57 /* 64/32 -> 32 unsigned division */
58 uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
59 {
60 uint32_t ret, b = b64;
61 uint64_t q;
62
63 if (b == 0) {
64 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
65 }
66
67 ret = q = a / b;
68 env->retxl = a % b;
69
70 /* Catch non-representable quotient. */
71 if (ret != q) {
72 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
73 }
74
75 return ret;
76 }
77
78 /* 64/64 -> 64 signed division */
79 int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
80 {
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());
84 }
85 env->retxl = a % b;
86 return a / b;
87 }
88
89 /* 128 -> 64/64 unsigned division */
90 uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
91 uint64_t b)
92 {
93 uint64_t ret;
94 /* Signal divide by zero. */
95 if (b == 0) {
96 tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC());
97 }
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());
111 }
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
117 }
118 return ret;
119 }
120
121 uint64_t HELPER(cvd)(int32_t reg)
122 {
123 /* positive 0 */
124 uint64_t dec = 0x0c;
125 int64_t bin = reg;
126 int shift;
127
128 if (bin < 0) {
129 bin = -bin;
130 dec = 0x0d;
131 }
132
133 for (shift = 4; (shift < 64) && bin; shift += 4) {
134 dec |= (bin % 10) << shift;
135 bin /= 10;
136 }
137
138 return dec;
139 }
140
141 uint64_t HELPER(popcnt)(uint64_t val)
142 {
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;
148 }