summaryrefslogtreecommitdiff
path: root/target-s390x/cc_helper.c
blob: 19ef145da91d3d6d4cd629877d61ddcefdfbd993 (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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
/*
 *  S/390 condition code helper routines
 *
 *  Copyright (c) 2009 Ulrich Hecht
 *  Copyright (c) 2009 Alexander Graf
 *
 * 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 "cpu.h"
#include "helper.h"

/* #define DEBUG_HELPER */
#ifdef DEBUG_HELPER
#define HELPER_LOG(x...) qemu_log(x)
#else
#define HELPER_LOG(x...)
#endif

static inline uint32_t cc_calc_ltgt_32(CPUS390XState *env, int32_t src,
                                       int32_t dst)
{
    if (src == dst) {
        return 0;
    } else if (src < dst) {
        return 1;
    } else {
        return 2;
    }
}

static inline uint32_t cc_calc_ltgt0_32(CPUS390XState *env, int32_t dst)
{
    return cc_calc_ltgt_32(env, dst, 0);
}

static inline uint32_t cc_calc_ltgt_64(CPUS390XState *env, int64_t src,
                                       int64_t dst)
{
    if (src == dst) {
        return 0;
    } else if (src < dst) {
        return 1;
    } else {
        return 2;
    }
}

static inline uint32_t cc_calc_ltgt0_64(CPUS390XState *env, int64_t dst)
{
    return cc_calc_ltgt_64(env, dst, 0);
}

static inline uint32_t cc_calc_ltugtu_32(CPUS390XState *env, uint32_t src,
                                         uint32_t dst)
{
    if (src == dst) {
        return 0;
    } else if (src < dst) {
        return 1;
    } else {
        return 2;
    }
}

static inline uint32_t cc_calc_ltugtu_64(CPUS390XState *env, uint64_t src,
                                         uint64_t dst)
{
    if (src == dst) {
        return 0;
    } else if (src < dst) {
        return 1;
    } else {
        return 2;
    }
}

static inline uint32_t cc_calc_tm_32(CPUS390XState *env, uint32_t val,
                                     uint32_t mask)
{
    uint16_t r = val & mask;

    HELPER_LOG("%s: val 0x%x mask 0x%x\n", __func__, val, mask);
    if (r == 0 || mask == 0) {
        return 0;
    } else if (r == mask) {
        return 3;
    } else {
        return 1;
    }
}

/* set condition code for test under mask */
static inline uint32_t cc_calc_tm_64(CPUS390XState *env, uint64_t val,
                                     uint32_t mask)
{
    uint16_t r = val & mask;

    HELPER_LOG("%s: val 0x%lx mask 0x%x r 0x%x\n", __func__, val, mask, r);
    if (r == 0 || mask == 0) {
        return 0;
    } else if (r == mask) {
        return 3;
    } else {
        while (!(mask & 0x8000)) {
            mask <<= 1;
            val <<= 1;
        }
        if (val & 0x8000) {
            return 2;
        } else {
            return 1;
        }
    }
}

static inline uint32_t cc_calc_nz(CPUS390XState *env, uint64_t dst)
{
    return !!dst;
}

static inline uint32_t cc_calc_add_64(CPUS390XState *env, int64_t a1,
                                      int64_t a2, int64_t ar)
{
    if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
        return 3; /* overflow */
    } else {
        if (ar < 0) {
            return 1;
        } else if (ar > 0) {
            return 2;
        } else {
            return 0;
        }
    }
}

static inline uint32_t cc_calc_addu_64(CPUS390XState *env, uint64_t a1,
                                       uint64_t a2, uint64_t ar)
{
    if (ar == 0) {
        if (a1) {
            return 2;
        } else {
            return 0;
        }
    } else {
        if (ar < a1 || ar < a2) {
            return 3;
        } else {
            return 1;
        }
    }
}

static inline uint32_t cc_calc_sub_64(CPUS390XState *env, int64_t a1,
                                      int64_t a2, int64_t ar)
{
    if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
        return 3; /* overflow */
    } else {
        if (ar < 0) {
            return 1;
        } else if (ar > 0) {
            return 2;
        } else {
            return 0;
        }
    }
}

static inline uint32_t cc_calc_subu_64(CPUS390XState *env, uint64_t a1,
                                       uint64_t a2, uint64_t ar)
{
    if (ar == 0) {
        return 2;
    } else {
        if (a2 > a1) {
            return 1;
        } else {
            return 3;
        }
    }
}

static inline uint32_t cc_calc_abs_64(CPUS390XState *env, int64_t dst)
{
    if ((uint64_t)dst == 0x8000000000000000ULL) {
        return 3;
    } else if (dst) {
        return 1;
    } else {
        return 0;
    }
}

static inline uint32_t cc_calc_nabs_64(CPUS390XState *env, int64_t dst)
{
    return !!dst;
}

static inline uint32_t cc_calc_comp_64(CPUS390XState *env, int64_t dst)
{
    if ((uint64_t)dst == 0x8000000000000000ULL) {
        return 3;
    } else if (dst < 0) {
        return 1;
    } else if (dst > 0) {
        return 2;
    } else {
        return 0;
    }
}


static inline uint32_t cc_calc_add_32(CPUS390XState *env, int32_t a1,
                                      int32_t a2, int32_t ar)
{
    if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
        return 3; /* overflow */
    } else {
        if (ar < 0) {
            return 1;
        } else if (ar > 0) {
            return 2;
        } else {
            return 0;
        }
    }
}

static inline uint32_t cc_calc_addu_32(CPUS390XState *env, uint32_t a1,
                                       uint32_t a2, uint32_t ar)
{
    if (ar == 0) {
        if (a1) {
            return 2;
        } else {
            return 0;
        }
    } else {
        if (ar < a1 || ar < a2) {
            return 3;
        } else {
            return 1;
        }
    }
}

static inline uint32_t cc_calc_sub_32(CPUS390XState *env, int32_t a1,
                                      int32_t a2, int32_t ar)
{
    if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
        return 3; /* overflow */
    } else {
        if (ar < 0) {
            return 1;
        } else if (ar > 0) {
            return 2;
        } else {
            return 0;
        }
    }
}

static inline uint32_t cc_calc_subu_32(CPUS390XState *env, uint32_t a1,
                                       uint32_t a2, uint32_t ar)
{
    if (ar == 0) {
        return 2;
    } else {
        if (a2 > a1) {
            return 1;
        } else {
            return 3;
        }
    }
}

static inline uint32_t cc_calc_abs_32(CPUS390XState *env, int32_t dst)
{
    if ((uint32_t)dst == 0x80000000UL) {
        return 3;
    } else if (dst) {
        return 1;
    } else {
        return 0;
    }
}

static inline uint32_t cc_calc_nabs_32(CPUS390XState *env, int32_t dst)
{
    return !!dst;
}

static inline uint32_t cc_calc_comp_32(CPUS390XState *env, int32_t dst)
{
    if ((uint32_t)dst == 0x80000000UL) {
        return 3;
    } else if (dst < 0) {
        return 1;
    } else if (dst > 0) {
        return 2;
    } else {
        return 0;
    }
}

/* calculate condition code for insert character under mask insn */
static inline uint32_t cc_calc_icm_32(CPUS390XState *env, uint32_t mask,
                                      uint32_t val)
{
    uint32_t cc;

    HELPER_LOG("%s: mask 0x%x val %d\n", __func__, mask, val);
    if (mask == 0xf) {
        if (!val) {
            return 0;
        } else if (val & 0x80000000) {
            return 1;
        } else {
            return 2;
        }
    }

    if (!val || !mask) {
        cc = 0;
    } else {
        while (mask != 1) {
            mask >>= 1;
            val >>= 8;
        }
        if (val & 0x80) {
            cc = 1;
        } else {
            cc = 2;
        }
    }
    return cc;
}

static inline uint32_t cc_calc_slag(CPUS390XState *env, uint64_t src,
                                    uint64_t shift)
{
    uint64_t mask = ((1ULL << shift) - 1ULL) << (64 - shift);
    uint64_t match, r;

    /* check if the sign bit stays the same */
    if (src & (1ULL << 63)) {
        match = mask;
    } else {
        match = 0;
    }

    if ((src & mask) != match) {
        /* overflow */
        return 3;
    }

    r = ((src << shift) & ((1ULL << 63) - 1)) | (src & (1ULL << 63));

    if ((int64_t)r == 0) {
        return 0;
    } else if ((int64_t)r < 0) {
        return 1;
    }

    return 2;
}


static inline uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op,
                                  uint64_t src, uint64_t dst, uint64_t vr)
{
    uint32_t r = 0;

    switch (cc_op) {
    case CC_OP_CONST0:
    case CC_OP_CONST1:
    case CC_OP_CONST2:
    case CC_OP_CONST3:
        /* cc_op value _is_ cc */
        r = cc_op;
        break;
    case CC_OP_LTGT0_32:
        r = cc_calc_ltgt0_32(env, dst);
        break;
    case CC_OP_LTGT0_64:
        r =  cc_calc_ltgt0_64(env, dst);
        break;
    case CC_OP_LTGT_32:
        r =  cc_calc_ltgt_32(env, src, dst);
        break;
    case CC_OP_LTGT_64:
        r =  cc_calc_ltgt_64(env, src, dst);
        break;
    case CC_OP_LTUGTU_32:
        r =  cc_calc_ltugtu_32(env, src, dst);
        break;
    case CC_OP_LTUGTU_64:
        r =  cc_calc_ltugtu_64(env, src, dst);
        break;
    case CC_OP_TM_32:
        r =  cc_calc_tm_32(env, src, dst);
        break;
    case CC_OP_TM_64:
        r =  cc_calc_tm_64(env, src, dst);
        break;
    case CC_OP_NZ:
        r =  cc_calc_nz(env, dst);
        break;
    case CC_OP_ADD_64:
        r =  cc_calc_add_64(env, src, dst, vr);
        break;
    case CC_OP_ADDU_64:
        r =  cc_calc_addu_64(env, src, dst, vr);
        break;
    case CC_OP_SUB_64:
        r =  cc_calc_sub_64(env, src, dst, vr);
        break;
    case CC_OP_SUBU_64:
        r =  cc_calc_subu_64(env, src, dst, vr);
        break;
    case CC_OP_ABS_64:
        r =  cc_calc_abs_64(env, dst);
        break;
    case CC_OP_NABS_64:
        r =  cc_calc_nabs_64(env, dst);
        break;
    case CC_OP_COMP_64:
        r =  cc_calc_comp_64(env, dst);
        break;

    case CC_OP_ADD_32:
        r =  cc_calc_add_32(env, src, dst, vr);
        break;
    case CC_OP_ADDU_32:
        r =  cc_calc_addu_32(env, src, dst, vr);
        break;
    case CC_OP_SUB_32:
        r =  cc_calc_sub_32(env, src, dst, vr);
        break;
    case CC_OP_SUBU_32:
        r =  cc_calc_subu_32(env, src, dst, vr);
        break;
    case CC_OP_ABS_32:
        r =  cc_calc_abs_64(env, dst);
        break;
    case CC_OP_NABS_32:
        r =  cc_calc_nabs_64(env, dst);
        break;
    case CC_OP_COMP_32:
        r =  cc_calc_comp_32(env, dst);
        break;

    case CC_OP_ICM:
        r =  cc_calc_icm_32(env, src, dst);
        break;
    case CC_OP_SLAG:
        r =  cc_calc_slag(env, src, dst);
        break;

    case CC_OP_LTGT_F32:
        r = set_cc_f32(env, src, dst);
        break;
    case CC_OP_LTGT_F64:
        r = set_cc_f64(env, src, dst);
        break;
    case CC_OP_NZ_F32:
        r = set_cc_nz_f32(dst);
        break;
    case CC_OP_NZ_F64:
        r = set_cc_nz_f64(dst);
        break;

    default:
        cpu_abort(env, "Unknown CC operation: %s\n", cc_name(cc_op));
    }

    HELPER_LOG("%s: %15s 0x%016lx 0x%016lx 0x%016lx = %d\n", __func__,
               cc_name(cc_op), src, dst, vr, r);
    return r;
}

uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
                 uint64_t vr)
{
    return do_calc_cc(env, cc_op, src, dst, vr);
}

uint32_t HELPER(calc_cc)(CPUS390XState *env, uint32_t cc_op, uint64_t src,
                         uint64_t dst, uint64_t vr)
{
    return do_calc_cc(env, cc_op, src, dst, vr);
}

/* insert psw mask and condition code into r1 */
void HELPER(ipm)(CPUS390XState *env, uint32_t cc, uint32_t r1)
{
    uint64_t r = env->regs[r1];

    r &= 0xffffffff00ffffffULL;
    r |= (cc << 28) | ((env->psw.mask >> 40) & 0xf);
    env->regs[r1] = r;
    HELPER_LOG("%s: cc %d psw.mask 0x%lx r1 0x%lx\n", __func__,
               cc, env->psw.mask, r);
}

#ifndef CONFIG_USER_ONLY
void HELPER(load_psw)(CPUS390XState *env, uint64_t mask, uint64_t addr)
{
    load_psw(env, mask, addr);
    cpu_loop_exit(env);
}

void HELPER(sacf)(CPUS390XState *env, uint64_t a1)
{
    HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1);

    switch (a1 & 0xf00) {
    case 0x000:
        env->psw.mask &= ~PSW_MASK_ASC;
        env->psw.mask |= PSW_ASC_PRIMARY;
        break;
    case 0x100:
        env->psw.mask &= ~PSW_MASK_ASC;
        env->psw.mask |= PSW_ASC_SECONDARY;
        break;
    case 0x300:
        env->psw.mask &= ~PSW_MASK_ASC;
        env->psw.mask |= PSW_ASC_HOME;
        break;
    default:
        qemu_log("unknown sacf mode: %" PRIx64 "\n", a1);
        program_interrupt(env, PGM_SPECIFICATION, 2);
        break;
    }
}
#endif