aboutsummaryrefslogtreecommitdiff
path: root/target/sparc/helper.c
blob: 359b0b15ed30ee7b712fc77b0049f0559548541d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
/*
 *  Misc Sparc helpers
 *
 *  Copyright (c) 2003-2005 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "qemu/host-utils.h"
#include "exec/helper-proto.h"
#include "sysemu/sysemu.h"

void cpu_raise_exception_ra(CPUSPARCState *env, int tt, uintptr_t ra)
{
    CPUState *cs = CPU(sparc_env_get_cpu(env));

    cs->exception_index = tt;
    cpu_loop_exit_restore(cs, ra);
}

void helper_raise_exception(CPUSPARCState *env, int tt)
{
    CPUState *cs = CPU(sparc_env_get_cpu(env));

    cs->exception_index = tt;
    cpu_loop_exit(cs);
}

void helper_debug(CPUSPARCState *env)
{
    CPUState *cs = CPU(sparc_env_get_cpu(env));

    cs->exception_index = EXCP_DEBUG;
    cpu_loop_exit(cs);
}

#ifdef TARGET_SPARC64
target_ulong helper_popc(target_ulong val)
{
    return ctpop64(val);
}

void helper_tick_set_count(void *opaque, uint64_t count)
{
#if !defined(CONFIG_USER_ONLY)
    cpu_tick_set_count(opaque, count);
#endif
}

uint64_t helper_tick_get_count(CPUSPARCState *env, void *opaque, int mem_idx)
{
#if !defined(CONFIG_USER_ONLY)
    CPUTimer *timer = opaque;

    if (timer->npt && mem_idx < MMU_KERNEL_IDX) {
        cpu_raise_exception_ra(env, TT_PRIV_INSN, GETPC());
    }

    return cpu_tick_get_count(timer);
#else
    return 0;
#endif
}

void helper_tick_set_limit(void *opaque, uint64_t limit)
{
#if !defined(CONFIG_USER_ONLY)
    cpu_tick_set_limit(opaque, limit);
#endif
}
#endif

static target_ulong do_udiv(CPUSPARCState *env, target_ulong a,
                            target_ulong b, int cc, uintptr_t ra)
{
    int overflow = 0;
    uint64_t x0;
    uint32_t x1;

    x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
    x1 = (b & 0xffffffff);

    if (x1 == 0) {
        cpu_raise_exception_ra(env, TT_DIV_ZERO, ra);
    }

    x0 = x0 / x1;
    if (x0 > UINT32_MAX) {
        x0 = UINT32_MAX;
        overflow = 1;
    }

    if (cc) {
        env->cc_dst = x0;
        env->cc_src2 = overflow;
        env->cc_op = CC_OP_DIV;
    }
    return x0;
}

target_ulong helper_udiv(CPUSPARCState *env, target_ulong a, target_ulong b)
{
    return do_udiv(env, a, b, 0, GETPC());
}

target_ulong helper_udiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b)
{
    return do_udiv(env, a, b, 1, GETPC());
}

static target_ulong do_sdiv(CPUSPARCState *env, target_ulong a,
                            target_ulong b, int cc, uintptr_t ra)
{
    int overflow = 0;
    int64_t x0;
    int32_t x1;

    x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
    x1 = (b & 0xffffffff);

    if (x1 == 0) {
        cpu_raise_exception_ra(env, TT_DIV_ZERO, ra);
    } else if (x1 == -1 && x0 == INT64_MIN) {
        x0 = INT32_MAX;
        overflow = 1;
    } else {
        x0 = x0 / x1;
        if ((int32_t) x0 != x0) {
            x0 = x0 < 0 ? INT32_MIN : INT32_MAX;
            overflow = 1;
        }
    }

    if (cc) {
        env->cc_dst = x0;
        env->cc_src2 = overflow;
        env->cc_op = CC_OP_DIV;
    }
    return x0;
}

target_ulong helper_sdiv(CPUSPARCState *env, target_ulong a, target_ulong b)
{
    return do_sdiv(env, a, b, 0, GETPC());
}

target_ulong helper_sdiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b)
{
    return do_sdiv(env, a, b, 1, GETPC());
}

#ifdef TARGET_SPARC64
int64_t helper_sdivx(CPUSPARCState *env, int64_t a, int64_t b)
{
    if (b == 0) {
        /* Raise divide by zero trap.  */
        cpu_raise_exception_ra(env, TT_DIV_ZERO, GETPC());
    } else if (b == -1) {
        /* Avoid overflow trap with i386 divide insn.  */
        return -a;
    } else {
        return a / b;
    }
}

uint64_t helper_udivx(CPUSPARCState *env, uint64_t a, uint64_t b)
{
    if (b == 0) {
        /* Raise divide by zero trap.  */
        cpu_raise_exception_ra(env, TT_DIV_ZERO, GETPC());
    }
    return a / b;
}
#endif

target_ulong helper_taddcctv(CPUSPARCState *env, target_ulong src1,
                             target_ulong src2)
{
    target_ulong dst;

    /* Tag overflow occurs if either input has bits 0 or 1 set.  */
    if ((src1 | src2) & 3) {
        goto tag_overflow;
    }

    dst = src1 + src2;

    /* Tag overflow occurs if the addition overflows.  */
    if (~(src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
        goto tag_overflow;
    }

    /* Only modify the CC after any exceptions have been generated.  */
    env->cc_op = CC_OP_TADDTV;
    env->cc_src = src1;
    env->cc_src2 = src2;
    env->cc_dst = dst;
    return dst;

 tag_overflow:
    cpu_raise_exception_ra(env, TT_TOVF, GETPC());
}

target_ulong helper_tsubcctv(CPUSPARCState *env, target_ulong src1,
                             target_ulong src2)
{
    target_ulong dst;

    /* Tag overflow occurs if either input has bits 0 or 1 set.  */
    if ((src1 | src2) & 3) {
        goto tag_overflow;
    }

    dst = src1 - src2;

    /* Tag overflow occurs if the subtraction overflows.  */
    if ((src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
        goto tag_overflow;
    }

    /* Only modify the CC after any exceptions have been generated.  */
    env->cc_op = CC_OP_TSUBTV;
    env->cc_src = src1;
    env->cc_src2 = src2;
    env->cc_dst = dst;
    return dst;

 tag_overflow:
    cpu_raise_exception_ra(env, TT_TOVF, GETPC());
}

#ifndef TARGET_SPARC64
void helper_power_down(CPUSPARCState *env)
{
    CPUState *cs = CPU(sparc_env_get_cpu(env));

    cs->halted = 1;
    cs->exception_index = EXCP_HLT;
    env->pc = env->npc;
    env->npc = env->pc + 4;
    cpu_loop_exit(cs);
}
#endif