hw/arm/virt: Merge VirtBoardInfo and VirtMachineState
[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 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 "exec/exec-all.h"
24 #include "qemu/host-utils.h"
25 #include "exec/helper-proto.h"
26
27 /* #define DEBUG_HELPER */
28 #ifdef DEBUG_HELPER
29 #define HELPER_LOG(x...) qemu_log(x)
30 #else
31 #define HELPER_LOG(x...)
32 #endif
33
34 /* 64/32 -> 32 signed division */
35 int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
36 {
37 int32_t ret, b = b64;
38 int64_t q;
39
40 if (b == 0) {
41 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
42 }
43
44 ret = q = a / b;
45 env->retxl = a % b;
46
47 /* Catch non-representable quotient. */
48 if (ret != q) {
49 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
50 }
51
52 return ret;
53 }
54
55 /* 64/32 -> 32 unsigned division */
56 uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
57 {
58 uint32_t ret, b = b64;
59 uint64_t q;
60
61 if (b == 0) {
62 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
63 }
64
65 ret = q = a / b;
66 env->retxl = a % b;
67
68 /* Catch non-representable quotient. */
69 if (ret != q) {
70 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
71 }
72
73 return ret;
74 }
75
76 /* 64/64 -> 64 signed division */
77 int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
78 {
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());
82 }
83 env->retxl = a % b;
84 return a / b;
85 }
86
87 /* 128 -> 64/64 unsigned division */
88 uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
89 uint64_t b)
90 {
91 uint64_t ret;
92 /* Signal divide by zero. */
93 if (b == 0) {
94 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
95 }
96 if (ah == 0) {
97 /* 64 -> 64/64 case */
98 env->retxl = al % b;
99 ret = al / b;
100 } else {
101 /* ??? Move i386 idivq helper to host-utils. */
102 #ifdef CONFIG_INT128
103 __uint128_t a = ((__uint128_t)ah << 64) | al;
104 __uint128_t q = a / b;
105 env->retxl = a % b;
106 ret = q;
107 if (ret != q) {
108 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
109 }
110 #else
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");
115 #endif
116 }
117 return ret;
118 }
119
120 /* count leading zeros, for find leftmost one */
121 uint64_t HELPER(clz)(uint64_t v)
122 {
123 return clz64(v);
124 }
125
126 uint64_t HELPER(cvd)(int32_t reg)
127 {
128 /* positive 0 */
129 uint64_t dec = 0x0c;
130 int64_t bin = reg;
131 int shift;
132
133 if (bin < 0) {
134 bin = -bin;
135 dec = 0x0d;
136 }
137
138 for (shift = 4; (shift < 64) && bin; shift += 4) {
139 dec |= (bin % 10) << shift;
140 bin /= 10;
141 }
142
143 return dec;
144 }
145
146 uint64_t HELPER(popcnt)(uint64_t r2)
147 {
148 uint64_t ret = 0;
149 int i;
150
151 for (i = 0; i < 64; i += 8) {
152 uint64_t t = ctpop32((r2 >> i) & 0xff);
153 ret |= t << i;
154 }
155 return ret;
156 }