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1
/*
2
 *  sparc helpers
3
 *
4
 *  Copyright (c) 2003-2005 Fabrice Bellard
5
 *
6
 * This library is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2 of the License, or (at your option) any later version.
10
 *
11
 * This library is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19
 */
20
#include <stdarg.h>
21
#include <stdlib.h>
22
#include <stdio.h>
23
#include <string.h>
24
#include <inttypes.h>
25
#include <signal.h>
26
#include <assert.h>
27

    
28
#include "cpu.h"
29
#include "exec-all.h"
30

    
31
//#define DEBUG_MMU
32

    
33
/* Sparc MMU emulation */
34

    
35
/* thread support */
36

    
37
spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
38

    
39
void cpu_lock(void)
40
{
41
    spin_lock(&global_cpu_lock);
42
}
43

    
44
void cpu_unlock(void)
45
{
46
    spin_unlock(&global_cpu_lock);
47
}
48

    
49
#if defined(CONFIG_USER_ONLY)
50

    
51
int cpu_sparc_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
52
                               int is_user, int is_softmmu)
53
{
54
    if (rw & 2)
55
        env->exception_index = TT_TFAULT;
56
    else
57
        env->exception_index = TT_DFAULT;
58
    return 1;
59
}
60

    
61
#else
62

    
63
#ifndef TARGET_SPARC64
64
/*
65
 * Sparc V8 Reference MMU (SRMMU)
66
 */
67
static const int access_table[8][8] = {
68
    { 0, 0, 0, 0, 2, 0, 3, 3 },
69
    { 0, 0, 0, 0, 2, 0, 0, 0 },
70
    { 2, 2, 0, 0, 0, 2, 3, 3 },
71
    { 2, 2, 0, 0, 0, 2, 0, 0 },
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    { 2, 0, 2, 0, 2, 2, 3, 3 },
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    { 2, 0, 2, 0, 2, 0, 2, 0 },
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    { 2, 2, 2, 0, 2, 2, 3, 3 },
75
    { 2, 2, 2, 0, 2, 2, 2, 0 }
76
};
77

    
78
static const int perm_table[2][8] = {
79
    {
80
        PAGE_READ,
81
        PAGE_READ | PAGE_WRITE,
82
        PAGE_READ | PAGE_EXEC,
83
        PAGE_READ | PAGE_WRITE | PAGE_EXEC,
84
        PAGE_EXEC,
85
        PAGE_READ | PAGE_WRITE,
86
        PAGE_READ | PAGE_EXEC,
87
        PAGE_READ | PAGE_WRITE | PAGE_EXEC
88
    },
89
    {
90
        PAGE_READ,
91
        PAGE_READ | PAGE_WRITE,
92
        PAGE_READ | PAGE_EXEC,
93
        PAGE_READ | PAGE_WRITE | PAGE_EXEC,
94
        PAGE_EXEC,
95
        PAGE_READ,
96
        0,
97
        0,
98
    }
99
};
100

    
101
int get_physical_address (CPUState *env, target_phys_addr_t *physical, int *prot,
102
                          int *access_index, target_ulong address, int rw,
103
                          int is_user)
104
{
105
    int access_perms = 0;
106
    target_phys_addr_t pde_ptr;
107
    uint32_t pde;
108
    target_ulong virt_addr;
109
    int error_code = 0, is_dirty;
110
    unsigned long page_offset;
111

    
112
    virt_addr = address & TARGET_PAGE_MASK;
113

    
114
    if ((env->mmuregs[0] & MMU_E) == 0) { /* MMU disabled */
115
        // Boot mode: instruction fetches are taken from PROM
116
        if (rw == 2 && (env->mmuregs[0] & MMU_BM)) {
117
            *physical = 0xff0000000ULL | (address & 0x3ffffULL);
118
            *prot = PAGE_READ | PAGE_EXEC;
119
            return 0;
120
        }
121
        *physical = address;
122
        *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
123
        return 0;
124
    }
125

    
126
    *access_index = ((rw & 1) << 2) | (rw & 2) | (is_user? 0 : 1);
127
    *physical = 0xffffffffffff0000ULL;
128

    
129
    /* SPARC reference MMU table walk: Context table->L1->L2->PTE */
130
    /* Context base + context number */
131
    pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 2);
132
    pde = ldl_phys(pde_ptr);
133

    
134
    /* Ctx pde */
135
    switch (pde & PTE_ENTRYTYPE_MASK) {
136
    default:
137
    case 0: /* Invalid */
138
        return 1 << 2;
139
    case 2: /* L0 PTE, maybe should not happen? */
140
    case 3: /* Reserved */
141
        return 4 << 2;
142
    case 1: /* L0 PDE */
143
        pde_ptr = ((address >> 22) & ~3) + ((pde & ~3) << 4);
144
        pde = ldl_phys(pde_ptr);
145

    
146
        switch (pde & PTE_ENTRYTYPE_MASK) {
147
        default:
148
        case 0: /* Invalid */
149
            return (1 << 8) | (1 << 2);
150
        case 3: /* Reserved */
151
            return (1 << 8) | (4 << 2);
152
        case 1: /* L1 PDE */
153
            pde_ptr = ((address & 0xfc0000) >> 16) + ((pde & ~3) << 4);
154
            pde = ldl_phys(pde_ptr);
155

    
156
            switch (pde & PTE_ENTRYTYPE_MASK) {
157
            default:
158
            case 0: /* Invalid */
159
                return (2 << 8) | (1 << 2);
160
            case 3: /* Reserved */
161
                return (2 << 8) | (4 << 2);
162
            case 1: /* L2 PDE */
163
                pde_ptr = ((address & 0x3f000) >> 10) + ((pde & ~3) << 4);
164
                pde = ldl_phys(pde_ptr);
165

    
166
                switch (pde & PTE_ENTRYTYPE_MASK) {
167
                default:
168
                case 0: /* Invalid */
169
                    return (3 << 8) | (1 << 2);
170
                case 1: /* PDE, should not happen */
171
                case 3: /* Reserved */
172
                    return (3 << 8) | (4 << 2);
173
                case 2: /* L3 PTE */
174
                    virt_addr = address & TARGET_PAGE_MASK;
175
                    page_offset = (address & TARGET_PAGE_MASK) & (TARGET_PAGE_SIZE - 1);
176
                }
177
                break;
178
            case 2: /* L2 PTE */
179
                virt_addr = address & ~0x3ffff;
180
                page_offset = address & 0x3ffff;
181
            }
182
            break;
183
        case 2: /* L1 PTE */
184
            virt_addr = address & ~0xffffff;
185
            page_offset = address & 0xffffff;
186
        }
187
    }
188

    
189
    /* update page modified and dirty bits */
190
    is_dirty = (rw & 1) && !(pde & PG_MODIFIED_MASK);
191
    if (!(pde & PG_ACCESSED_MASK) || is_dirty) {
192
        pde |= PG_ACCESSED_MASK;
193
        if (is_dirty)
194
            pde |= PG_MODIFIED_MASK;
195
        stl_phys_notdirty(pde_ptr, pde);
196
    }
197
    /* check access */
198
    access_perms = (pde & PTE_ACCESS_MASK) >> PTE_ACCESS_SHIFT;
199
    error_code = access_table[*access_index][access_perms];
200
    if (error_code && !((env->mmuregs[0] & MMU_NF) && is_user))
201
        return error_code;
202

    
203
    /* the page can be put in the TLB */
204
    *prot = perm_table[is_user][access_perms];
205
    if (!(pde & PG_MODIFIED_MASK)) {
206
        /* only set write access if already dirty... otherwise wait
207
           for dirty access */
208
        *prot &= ~PAGE_WRITE;
209
    }
210

    
211
    /* Even if large ptes, we map only one 4KB page in the cache to
212
       avoid filling it too fast */
213
    *physical = ((target_phys_addr_t)(pde & PTE_ADDR_MASK) << 4) + page_offset;
214
    return error_code;
215
}
216

    
217
/* Perform address translation */
218
int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
219
                              int is_user, int is_softmmu)
220
{
221
    target_phys_addr_t paddr;
222
    target_ulong vaddr;
223
    int error_code = 0, prot, ret = 0, access_index;
224

    
225
    error_code = get_physical_address(env, &paddr, &prot, &access_index, address, rw, is_user);
226
    if (error_code == 0) {
227
        vaddr = address & TARGET_PAGE_MASK;
228
        paddr &= TARGET_PAGE_MASK;
229
#ifdef DEBUG_MMU
230
        printf("Translate at " TARGET_FMT_lx " -> " TARGET_FMT_plx ", vaddr "
231
               TARGET_FMT_lx "\n", address, paddr, vaddr);
232
#endif
233
        ret = tlb_set_page_exec(env, vaddr, paddr, prot, is_user, is_softmmu);
234
        return ret;
235
    }
236

    
237
    if (env->mmuregs[3]) /* Fault status register */
238
        env->mmuregs[3] = 1; /* overflow (not read before another fault) */
239
    env->mmuregs[3] |= (access_index << 5) | error_code | 2;
240
    env->mmuregs[4] = address; /* Fault address register */
241

    
242
    if ((env->mmuregs[0] & MMU_NF) || env->psret == 0)  {
243
        // No fault mode: if a mapping is available, just override
244
        // permissions. If no mapping is available, redirect accesses to
245
        // neverland. Fake/overridden mappings will be flushed when
246
        // switching to normal mode.
247
        vaddr = address & TARGET_PAGE_MASK;
248
        prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
249
        ret = tlb_set_page_exec(env, vaddr, paddr, prot, is_user, is_softmmu);
250
        return ret;
251
    } else {
252
        if (rw & 2)
253
            env->exception_index = TT_TFAULT;
254
        else
255
            env->exception_index = TT_DFAULT;
256
        return 1;
257
    }
258
}
259

    
260
target_ulong mmu_probe(CPUState *env, target_ulong address, int mmulev)
261
{
262
    target_phys_addr_t pde_ptr;
263
    uint32_t pde;
264

    
265
    /* Context base + context number */
266
    pde_ptr = (target_phys_addr_t)(env->mmuregs[1] << 4) +
267
        (env->mmuregs[2] << 2);
268
    pde = ldl_phys(pde_ptr);
269

    
270
    switch (pde & PTE_ENTRYTYPE_MASK) {
271
    default:
272
    case 0: /* Invalid */
273
    case 2: /* PTE, maybe should not happen? */
274
    case 3: /* Reserved */
275
        return 0;
276
    case 1: /* L1 PDE */
277
        if (mmulev == 3)
278
            return pde;
279
        pde_ptr = ((address >> 22) & ~3) + ((pde & ~3) << 4);
280
        pde = ldl_phys(pde_ptr);
281

    
282
        switch (pde & PTE_ENTRYTYPE_MASK) {
283
        default:
284
        case 0: /* Invalid */
285
        case 3: /* Reserved */
286
            return 0;
287
        case 2: /* L1 PTE */
288
            return pde;
289
        case 1: /* L2 PDE */
290
            if (mmulev == 2)
291
                return pde;
292
            pde_ptr = ((address & 0xfc0000) >> 16) + ((pde & ~3) << 4);
293
            pde = ldl_phys(pde_ptr);
294

    
295
            switch (pde & PTE_ENTRYTYPE_MASK) {
296
            default:
297
            case 0: /* Invalid */
298
            case 3: /* Reserved */
299
                return 0;
300
            case 2: /* L2 PTE */
301
                return pde;
302
            case 1: /* L3 PDE */
303
                if (mmulev == 1)
304
                    return pde;
305
                pde_ptr = ((address & 0x3f000) >> 10) + ((pde & ~3) << 4);
306
                pde = ldl_phys(pde_ptr);
307

    
308
                switch (pde & PTE_ENTRYTYPE_MASK) {
309
                default:
310
                case 0: /* Invalid */
311
                case 1: /* PDE, should not happen */
312
                case 3: /* Reserved */
313
                    return 0;
314
                case 2: /* L3 PTE */
315
                    return pde;
316
                }
317
            }
318
        }
319
    }
320
    return 0;
321
}
322

    
323
#ifdef DEBUG_MMU
324
void dump_mmu(CPUState *env)
325
{
326
    target_ulong va, va1, va2;
327
    unsigned int n, m, o;
328
    target_phys_addr_t pde_ptr, pa;
329
    uint32_t pde;
330

    
331
    printf("MMU dump:\n");
332
    pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 2);
333
    pde = ldl_phys(pde_ptr);
334
    printf("Root ptr: " TARGET_FMT_plx ", ctx: %d\n",
335
           (target_phys_addr_t)env->mmuregs[1] << 4, env->mmuregs[2]);
336
    for (n = 0, va = 0; n < 256; n++, va += 16 * 1024 * 1024) {
337
        pde = mmu_probe(env, va, 2);
338
        if (pde) {
339
            pa = cpu_get_phys_page_debug(env, va);
340
            printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_plx
341
                   " PDE: " TARGET_FMT_lx "\n", va, pa, pde);
342
            for (m = 0, va1 = va; m < 64; m++, va1 += 256 * 1024) {
343
                pde = mmu_probe(env, va1, 1);
344
                if (pde) {
345
                    pa = cpu_get_phys_page_debug(env, va1);
346
                    printf(" VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_plx
347
                           " PDE: " TARGET_FMT_lx "\n", va1, pa, pde);
348
                    for (o = 0, va2 = va1; o < 64; o++, va2 += 4 * 1024) {
349
                        pde = mmu_probe(env, va2, 0);
350
                        if (pde) {
351
                            pa = cpu_get_phys_page_debug(env, va2);
352
                            printf("  VA: " TARGET_FMT_lx ", PA: "
353
                                   TARGET_FMT_plx " PTE: " TARGET_FMT_lx "\n",
354
                                   va2, pa, pde);
355
                        }
356
                    }
357
                }
358
            }
359
        }
360
    }
361
    printf("MMU dump ends\n");
362
}
363
#endif /* DEBUG_MMU */
364

    
365
#else /* !TARGET_SPARC64 */
366
/*
367
 * UltraSparc IIi I/DMMUs
368
 */
369
static int get_physical_address_data(CPUState *env, target_phys_addr_t *physical, int *prot,
370
                          int *access_index, target_ulong address, int rw,
371
                          int is_user)
372
{
373
    target_ulong mask;
374
    unsigned int i;
375

    
376
    if ((env->lsu & DMMU_E) == 0) { /* DMMU disabled */
377
        *physical = address;
378
        *prot = PAGE_READ | PAGE_WRITE;
379
        return 0;
380
    }
381

    
382
    for (i = 0; i < 64; i++) {
383
        switch ((env->dtlb_tte[i] >> 61) & 3) {
384
        default:
385
        case 0x0: // 8k
386
            mask = 0xffffffffffffe000ULL;
387
            break;
388
        case 0x1: // 64k
389
            mask = 0xffffffffffff0000ULL;
390
            break;
391
        case 0x2: // 512k
392
            mask = 0xfffffffffff80000ULL;
393
            break;
394
        case 0x3: // 4M
395
            mask = 0xffffffffffc00000ULL;
396
            break;
397
        }
398
        // ctx match, vaddr match?
399
        if (env->dmmuregs[1] == (env->dtlb_tag[i] & 0x1fff) &&
400
            (address & mask) == (env->dtlb_tag[i] & ~0x1fffULL)) {
401
            // valid, access ok?
402
            if ((env->dtlb_tte[i] & 0x8000000000000000ULL) == 0 ||
403
                ((env->dtlb_tte[i] & 0x4) && is_user) ||
404
                (!(env->dtlb_tte[i] & 0x2) && (rw == 1))) {
405
                if (env->dmmuregs[3]) /* Fault status register */
406
                    env->dmmuregs[3] = 2; /* overflow (not read before another fault) */
407
                env->dmmuregs[3] |= (is_user << 3) | ((rw == 1) << 2) | 1;
408
                env->dmmuregs[4] = address; /* Fault address register */
409
                env->exception_index = TT_DFAULT;
410
#ifdef DEBUG_MMU
411
                printf("DFAULT at 0x%" PRIx64 "\n", address);
412
#endif
413
                return 1;
414
            }
415
            *physical = (env->dtlb_tte[i] & mask & 0x1fffffff000ULL) + (address & ~mask & 0x1fffffff000ULL);
416
            *prot = PAGE_READ;
417
            if (env->dtlb_tte[i] & 0x2)
418
                *prot |= PAGE_WRITE;
419
            return 0;
420
        }
421
    }
422
#ifdef DEBUG_MMU
423
    printf("DMISS at 0x%" PRIx64 "\n", address);
424
#endif
425
    env->exception_index = TT_DMISS;
426
    return 1;
427
}
428

    
429
static int get_physical_address_code(CPUState *env, target_phys_addr_t *physical, int *prot,
430
                          int *access_index, target_ulong address, int rw,
431
                          int is_user)
432
{
433
    target_ulong mask;
434
    unsigned int i;
435

    
436
    if ((env->lsu & IMMU_E) == 0) { /* IMMU disabled */
437
        *physical = address;
438
        *prot = PAGE_EXEC;
439
        return 0;
440
    }
441

    
442
    for (i = 0; i < 64; i++) {
443
        switch ((env->itlb_tte[i] >> 61) & 3) {
444
        default:
445
        case 0x0: // 8k
446
            mask = 0xffffffffffffe000ULL;
447
            break;
448
        case 0x1: // 64k
449
            mask = 0xffffffffffff0000ULL;
450
            break;
451
        case 0x2: // 512k
452
            mask = 0xfffffffffff80000ULL;
453
            break;
454
        case 0x3: // 4M
455
            mask = 0xffffffffffc00000ULL;
456
                break;
457
        }
458
        // ctx match, vaddr match?
459
        if (env->dmmuregs[1] == (env->itlb_tag[i] & 0x1fff) &&
460
            (address & mask) == (env->itlb_tag[i] & ~0x1fffULL)) {
461
            // valid, access ok?
462
            if ((env->itlb_tte[i] & 0x8000000000000000ULL) == 0 ||
463
                ((env->itlb_tte[i] & 0x4) && is_user)) {
464
                if (env->immuregs[3]) /* Fault status register */
465
                    env->immuregs[3] = 2; /* overflow (not read before another fault) */
466
                env->immuregs[3] |= (is_user << 3) | 1;
467
                env->exception_index = TT_TFAULT;
468
#ifdef DEBUG_MMU
469
                printf("TFAULT at 0x%" PRIx64 "\n", address);
470
#endif
471
                return 1;
472
            }
473
            *physical = (env->itlb_tte[i] & mask & 0x1fffffff000ULL) + (address & ~mask & 0x1fffffff000ULL);
474
            *prot = PAGE_EXEC;
475
            return 0;
476
        }
477
    }
478
#ifdef DEBUG_MMU
479
    printf("TMISS at 0x%" PRIx64 "\n", address);
480
#endif
481
    env->exception_index = TT_TMISS;
482
    return 1;
483
}
484

    
485
int get_physical_address(CPUState *env, target_phys_addr_t *physical, int *prot,
486
                          int *access_index, target_ulong address, int rw,
487
                          int is_user)
488
{
489
    if (rw == 2)
490
        return get_physical_address_code(env, physical, prot, access_index, address, rw, is_user);
491
    else
492
        return get_physical_address_data(env, physical, prot, access_index, address, rw, is_user);
493
}
494

    
495
/* Perform address translation */
496
int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
497
                              int is_user, int is_softmmu)
498
{
499
    target_ulong virt_addr, vaddr;
500
    target_phys_addr_t paddr;
501
    int error_code = 0, prot, ret = 0, access_index;
502

    
503
    error_code = get_physical_address(env, &paddr, &prot, &access_index, address, rw, is_user);
504
    if (error_code == 0) {
505
        virt_addr = address & TARGET_PAGE_MASK;
506
        vaddr = virt_addr + ((address & TARGET_PAGE_MASK) & (TARGET_PAGE_SIZE - 1));
507
#ifdef DEBUG_MMU
508
        printf("Translate at 0x%" PRIx64 " -> 0x%" PRIx64 ", vaddr 0x%" PRIx64 "\n", address, paddr, vaddr);
509
#endif
510
        ret = tlb_set_page_exec(env, vaddr, paddr, prot, is_user, is_softmmu);
511
        return ret;
512
    }
513
    // XXX
514
    return 1;
515
}
516

    
517
#ifdef DEBUG_MMU
518
void dump_mmu(CPUState *env)
519
{
520
    unsigned int i;
521
    const char *mask;
522

    
523
    printf("MMU contexts: Primary: %" PRId64 ", Secondary: %" PRId64 "\n", env->dmmuregs[1], env->dmmuregs[2]);
524
    if ((env->lsu & DMMU_E) == 0) {
525
        printf("DMMU disabled\n");
526
    } else {
527
        printf("DMMU dump:\n");
528
        for (i = 0; i < 64; i++) {
529
            switch ((env->dtlb_tte[i] >> 61) & 3) {
530
            default:
531
            case 0x0:
532
                mask = "  8k";
533
                break;
534
            case 0x1:
535
                mask = " 64k";
536
                break;
537
            case 0x2:
538
                mask = "512k";
539
                break;
540
            case 0x3:
541
                mask = "  4M";
542
                break;
543
            }
544
            if ((env->dtlb_tte[i] & 0x8000000000000000ULL) != 0) {
545
                printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx ", %s, %s, %s, %s, ctx %" PRId64 "\n",
546
                       env->dtlb_tag[i] & ~0x1fffULL,
547
                       env->dtlb_tte[i] & 0x1ffffffe000ULL,
548
                       mask,
549
                       env->dtlb_tte[i] & 0x4? "priv": "user",
550
                       env->dtlb_tte[i] & 0x2? "RW": "RO",
551
                       env->dtlb_tte[i] & 0x40? "locked": "unlocked",
552
                       env->dtlb_tag[i] & 0x1fffULL);
553
            }
554
        }
555
    }
556
    if ((env->lsu & IMMU_E) == 0) {
557
        printf("IMMU disabled\n");
558
    } else {
559
        printf("IMMU dump:\n");
560
        for (i = 0; i < 64; i++) {
561
            switch ((env->itlb_tte[i] >> 61) & 3) {
562
            default:
563
            case 0x0:
564
                mask = "  8k";
565
                break;
566
            case 0x1:
567
                mask = " 64k";
568
                break;
569
            case 0x2:
570
                mask = "512k";
571
                break;
572
            case 0x3:
573
                mask = "  4M";
574
                break;
575
            }
576
            if ((env->itlb_tte[i] & 0x8000000000000000ULL) != 0) {
577
                printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx ", %s, %s, %s, ctx %" PRId64 "\n",
578
                       env->itlb_tag[i] & ~0x1fffULL,
579
                       env->itlb_tte[i] & 0x1ffffffe000ULL,
580
                       mask,
581
                       env->itlb_tte[i] & 0x4? "priv": "user",
582
                       env->itlb_tte[i] & 0x40? "locked": "unlocked",
583
                       env->itlb_tag[i] & 0x1fffULL);
584
            }
585
        }
586
    }
587
}
588
#endif /* DEBUG_MMU */
589

    
590
#endif /* TARGET_SPARC64 */
591
#endif /* !CONFIG_USER_ONLY */
592

    
593
void memcpy32(target_ulong *dst, const target_ulong *src)
594
{
595
    dst[0] = src[0];
596
    dst[1] = src[1];
597
    dst[2] = src[2];
598
    dst[3] = src[3];
599
    dst[4] = src[4];
600
    dst[5] = src[5];
601
    dst[6] = src[6];
602
    dst[7] = src[7];
603
}