blob: 85e49aafa687dc29c1cbf4338231ac7c21efeb36 [file] [log] [blame]
Blue Swirlfc8d72c2012-09-02 07:33:33 +00001/*
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 "cpu.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010022#include "qemu/host-utils.h"
Blue Swirlfc8d72c2012-09-02 07:33:33 +000023#include "helper.h"
24
25/* #define DEBUG_HELPER */
26#ifdef DEBUG_HELPER
27#define HELPER_LOG(x...) qemu_log(x)
28#else
29#define HELPER_LOG(x...)
30#endif
31
Richard Henderson891452e2012-08-20 14:02:02 -070032/* 64/32 -> 32 signed division */
Richard Hendersonb4e2bd32012-09-05 17:27:40 -070033int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
Blue Swirlfc8d72c2012-09-02 07:33:33 +000034{
Richard Hendersonb4e2bd32012-09-05 17:27:40 -070035 int32_t ret, b = b64;
36 int64_t q;
37
38 if (b == 0) {
39 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
40 }
41
42 ret = q = a / b;
43 env->retxl = a % b;
44
45 /* Catch non-representable quotient. */
46 if (ret != q) {
47 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
48 }
49
50 return ret;
Richard Henderson891452e2012-08-20 14:02:02 -070051}
Blue Swirlfc8d72c2012-09-02 07:33:33 +000052
Richard Henderson891452e2012-08-20 14:02:02 -070053/* 64/32 -> 32 unsigned division */
Richard Hendersonb4e2bd32012-09-05 17:27:40 -070054uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
Richard Henderson891452e2012-08-20 14:02:02 -070055{
Richard Hendersonb4e2bd32012-09-05 17:27:40 -070056 uint32_t ret, b = b64;
57 uint64_t q;
58
59 if (b == 0) {
60 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
61 }
62
63 ret = q = a / b;
64 env->retxl = a % b;
65
66 /* Catch non-representable quotient. */
67 if (ret != q) {
68 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
69 }
70
71 return ret;
Richard Henderson891452e2012-08-20 14:02:02 -070072}
73
74/* 64/64 -> 64 signed division */
75int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
76{
Richard Hendersonb4e2bd32012-09-05 17:27:40 -070077 /* Catch divide by zero, and non-representable quotient (MIN / -1). */
78 if (b == 0 || (b == -1 && a == (1ll << 63))) {
79 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
80 }
Richard Henderson891452e2012-08-20 14:02:02 -070081 env->retxl = a % b;
82 return a / b;
83}
84
85/* 128 -> 64/64 unsigned division */
86uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
87 uint64_t b)
88{
89 uint64_t ret;
Richard Hendersonb4e2bd32012-09-05 17:27:40 -070090 /* Signal divide by zero. */
91 if (b == 0) {
92 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
93 }
Richard Henderson891452e2012-08-20 14:02:02 -070094 if (ah == 0) {
Blue Swirlfc8d72c2012-09-02 07:33:33 +000095 /* 64 -> 64/64 case */
Richard Henderson891452e2012-08-20 14:02:02 -070096 env->retxl = al % b;
97 ret = al / b;
Blue Swirlfc8d72c2012-09-02 07:33:33 +000098 } else {
Richard Henderson891452e2012-08-20 14:02:02 -070099 /* ??? Move i386 idivq helper to host-utils. */
Gabriel Kerneisd49b8e02013-04-23 18:15:12 +0100100#ifdef CONFIG_INT128
Richard Henderson891452e2012-08-20 14:02:02 -0700101 __uint128_t a = ((__uint128_t)ah << 64) | al;
102 __uint128_t q = a / b;
103 env->retxl = a % b;
104 ret = q;
Richard Hendersonb4e2bd32012-09-05 17:27:40 -0700105 if (ret != q) {
106 runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
107 }
Blue Swirlfc8d72c2012-09-02 07:33:33 +0000108#else
109 /* 32-bit hosts would need special wrapper functionality - just abort if
110 we encounter such a case; it's very unlikely anyways. */
111 cpu_abort(env, "128 -> 64/64 division not implemented\n");
112#endif
113 }
Richard Henderson891452e2012-08-20 14:02:02 -0700114 return ret;
Blue Swirlfc8d72c2012-09-02 07:33:33 +0000115}
116
117/* absolute value 32-bit */
118uint32_t HELPER(abs_i32)(int32_t val)
119{
120 if (val < 0) {
121 return -val;
122 } else {
123 return val;
124 }
125}
126
127/* negative absolute value 32-bit */
128int32_t HELPER(nabs_i32)(int32_t val)
129{
130 if (val < 0) {
131 return val;
132 } else {
133 return -val;
134 }
135}
136
137/* absolute value 64-bit */
138uint64_t HELPER(abs_i64)(int64_t val)
139{
140 HELPER_LOG("%s: val 0x%" PRIx64 "\n", __func__, val);
141
142 if (val < 0) {
143 return -val;
144 } else {
145 return val;
146 }
147}
148
149/* negative absolute value 64-bit */
150int64_t HELPER(nabs_i64)(int64_t val)
151{
152 if (val < 0) {
153 return val;
154 } else {
155 return -val;
156 }
157}
158
Richard Henderson102bf2c2012-08-24 07:39:11 -0700159/* count leading zeros, for find leftmost one */
160uint64_t HELPER(clz)(uint64_t v)
Blue Swirlfc8d72c2012-09-02 07:33:33 +0000161{
Richard Henderson102bf2c2012-08-24 07:39:11 -0700162 return clz64(v);
Blue Swirlfc8d72c2012-09-02 07:33:33 +0000163}
164
165uint64_t HELPER(cvd)(int32_t bin)
166{
167 /* positive 0 */
168 uint64_t dec = 0x0c;
169 int shift = 4;
170
171 if (bin < 0) {
172 bin = -bin;
173 dec = 0x0d;
174 }
175
176 for (shift = 4; (shift < 64) && bin; shift += 4) {
177 int current_number = bin % 10;
178
179 dec |= (current_number) << shift;
180 bin /= 10;
181 }
182
183 return dec;
184}
Richard Henderson99b4f242012-09-01 11:14:04 -0700185
186uint64_t HELPER(popcnt)(uint64_t r2)
187{
188 uint64_t ret = 0;
189 int i;
190
191 for (i = 0; i < 64; i += 8) {
192 uint64_t t = ctpop32((r2 >> i) & 0xff);
193 ret |= t << i;
194 }
195 return ret;
196}