arch/powerpc/lib/copyuser_power7.S

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  * Copyright (C) IBM Corporation, 2011
  17  *
  18  * Author: Anton Blanchard <anton@au.ibm.com>
  19  */
  20 #include <asm/ppc_asm.h>
  21
  22 #ifdef __BIG_ENDIAN__
  23 #define LVS(VRT,RA,RB)          lvsl    VRT,RA,RB
  24 #define VPERM(VRT,VRA,VRB,VRC)  vperm   VRT,VRA,VRB,VRC
  25 #else
  26 #define LVS(VRT,RA,RB)          lvsr    VRT,RA,RB
  27 #define VPERM(VRT,VRA,VRB,VRC)  vperm   VRT,VRB,VRA,VRC
  28 #endif
  29
  30         .macro err1
  31 100:
  32         EX_TABLE(100b,.Ldo_err1)
  33         .endm
  34
  35         .macro err2
  36 200:
  37         EX_TABLE(200b,.Ldo_err2)
  38         .endm
  39
  40 #ifdef CONFIG_ALTIVEC
  41         .macro err3
  42 300:
  43         EX_TABLE(300b,.Ldo_err3)
  44         .endm
  45
  46         .macro err4
  47 400:
  48         EX_TABLE(400b,.Ldo_err4)
  49         .endm
  50
  51
  52 .Ldo_err4:
  53         ld      r16,STK_REG(R16)(r1)
  54         ld      r15,STK_REG(R15)(r1)
  55         ld      r14,STK_REG(R14)(r1)
  56 .Ldo_err3:
  57         bl      exit_vmx_usercopy
  58         ld      r0,STACKFRAMESIZE+16(r1)
  59         mtlr    r0
  60         b       .Lexit
  61 #endif /* CONFIG_ALTIVEC */
  62
  63 .Ldo_err2:
  64         ld      r22,STK_REG(R22)(r1)
  65         ld      r21,STK_REG(R21)(r1)
  66         ld      r20,STK_REG(R20)(r1)
  67         ld      r19,STK_REG(R19)(r1)
  68         ld      r18,STK_REG(R18)(r1)
  69         ld      r17,STK_REG(R17)(r1)
  70         ld      r16,STK_REG(R16)(r1)
  71         ld      r15,STK_REG(R15)(r1)
  72         ld      r14,STK_REG(R14)(r1)
  73 .Lexit:
  74         addi    r1,r1,STACKFRAMESIZE
  75 .Ldo_err1:
  76         ld      r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
  77         ld      r4,-STACKFRAMESIZE+STK_REG(R30)(r1)
  78         ld      r5,-STACKFRAMESIZE+STK_REG(R29)(r1)
  79         b       __copy_tofrom_user_base
  80
  81
  82 _GLOBAL(__copy_tofrom_user_power7)
  83 #ifdef CONFIG_ALTIVEC
  84         cmpldi  r5,16
  85         cmpldi  cr1,r5,3328
  86
  87         std     r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
  88         std     r4,-STACKFRAMESIZE+STK_REG(R30)(r1)
  89         std     r5,-STACKFRAMESIZE+STK_REG(R29)(r1)
  90
  91         blt     .Lshort_copy
  92         bge     cr1,.Lvmx_copy
  93 #else
  94         cmpldi  r5,16
  95
  96         std     r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
  97         std     r4,-STACKFRAMESIZE+STK_REG(R30)(r1)
  98         std     r5,-STACKFRAMESIZE+STK_REG(R29)(r1)
  99
 100         blt     .Lshort_copy
 101 #endif
 102
 103 .Lnonvmx_copy:
 104         /* Get the source 8B aligned */
 105         neg     r6,r4
 106         mtocrf  0x01,r6
 107         clrldi  r6,r6,(64-3)
 108
 109         bf      cr7*4+3,1f
 110 err1;   lbz     r0,0(r4)
 111         addi    r4,r4,1
 112 err1;   stb     r0,0(r3)
 113         addi    r3,r3,1
 114
 115 1:      bf      cr7*4+2,2f
 116 err1;   lhz     r0,0(r4)
 117         addi    r4,r4,2
 118 err1;   sth     r0,0(r3)
 119         addi    r3,r3,2
 120
 121 2:      bf      cr7*4+1,3f
 122 err1;   lwz     r0,0(r4)
 123         addi    r4,r4,4
 124 err1;   stw     r0,0(r3)
 125         addi    r3,r3,4
 126
 127 3:      sub     r5,r5,r6
 128         cmpldi  r5,128
 129         blt     5f
 130
 131         mflr    r0
 132         stdu    r1,-STACKFRAMESIZE(r1)
 133         std     r14,STK_REG(R14)(r1)
 134         std     r15,STK_REG(R15)(r1)
 135         std     r16,STK_REG(R16)(r1)
 136         std     r17,STK_REG(R17)(r1)
 137         std     r18,STK_REG(R18)(r1)
 138         std     r19,STK_REG(R19)(r1)
 139         std     r20,STK_REG(R20)(r1)
 140         std     r21,STK_REG(R21)(r1)
 141         std     r22,STK_REG(R22)(r1)
 142         std     r0,STACKFRAMESIZE+16(r1)
 143
 144         srdi    r6,r5,7
 145         mtctr   r6
 146
 147         /* Now do cacheline (128B) sized loads and stores. */
 148         .align  5
 149 4:
 150 err2;   ld      r0,0(r4)
 151 err2;   ld      r6,8(r4)
 152 err2;   ld      r7,16(r4)
 153 err2;   ld      r8,24(r4)
 154 err2;   ld      r9,32(r4)
 155 err2;   ld      r10,40(r4)
 156 err2;   ld      r11,48(r4)
 157 err2;   ld      r12,56(r4)
 158 err2;   ld      r14,64(r4)
 159 err2;   ld      r15,72(r4)
 160 err2;   ld      r16,80(r4)
 161 err2;   ld      r17,88(r4)
 162 err2;   ld      r18,96(r4)
 163 err2;   ld      r19,104(r4)
 164 err2;   ld      r20,112(r4)
 165 err2;   ld      r21,120(r4)
 166         addi    r4,r4,128
 167 err2;   std     r0,0(r3)
 168 err2;   std     r6,8(r3)
 169 err2;   std     r7,16(r3)
 170 err2;   std     r8,24(r3)
 171 err2;   std     r9,32(r3)
 172 err2;   std     r10,40(r3)
 173 err2;   std     r11,48(r3)
 174 err2;   std     r12,56(r3)
 175 err2;   std     r14,64(r3)
 176 err2;   std     r15,72(r3)
 177 err2;   std     r16,80(r3)
 178 err2;   std     r17,88(r3)
 179 err2;   std     r18,96(r3)
 180 err2;   std     r19,104(r3)
 181 err2;   std     r20,112(r3)
 182 err2;   std     r21,120(r3)
 183         addi    r3,r3,128
 184         bdnz    4b
 185
 186         clrldi  r5,r5,(64-7)
 187
 188         ld      r14,STK_REG(R14)(r1)
 189         ld      r15,STK_REG(R15)(r1)
 190         ld      r16,STK_REG(R16)(r1)
 191         ld      r17,STK_REG(R17)(r1)
 192         ld      r18,STK_REG(R18)(r1)
 193         ld      r19,STK_REG(R19)(r1)
 194         ld      r20,STK_REG(R20)(r1)
 195         ld      r21,STK_REG(R21)(r1)
 196         ld      r22,STK_REG(R22)(r1)
 197         addi    r1,r1,STACKFRAMESIZE
 198
 199         /* Up to 127B to go */
 200 5:      srdi    r6,r5,4
 201         mtocrf  0x01,r6
 202
 203 6:      bf      cr7*4+1,7f
 204 err1;   ld      r0,0(r4)
 205 err1;   ld      r6,8(r4)
 206 err1;   ld      r7,16(r4)
 207 err1;   ld      r8,24(r4)
 208 err1;   ld      r9,32(r4)
 209 err1;   ld      r10,40(r4)
 210 err1;   ld      r11,48(r4)
 211 err1;   ld      r12,56(r4)
 212         addi    r4,r4,64
 213 err1;   std     r0,0(r3)
 214 err1;   std     r6,8(r3)
 215 err1;   std     r7,16(r3)
 216 err1;   std     r8,24(r3)
 217 err1;   std     r9,32(r3)
 218 err1;   std     r10,40(r3)
 219 err1;   std     r11,48(r3)
 220 err1;   std     r12,56(r3)
 221         addi    r3,r3,64
 222
 223         /* Up to 63B to go */
 224 7:      bf      cr7*4+2,8f
 225 err1;   ld      r0,0(r4)
 226 err1;   ld      r6,8(r4)
 227 err1;   ld      r7,16(r4)
 228 err1;   ld      r8,24(r4)
 229         addi    r4,r4,32
 230 err1;   std     r0,0(r3)
 231 err1;   std     r6,8(r3)
 232 err1;   std     r7,16(r3)
 233 err1;   std     r8,24(r3)
 234         addi    r3,r3,32
 235
 236         /* Up to 31B to go */
 237 8:      bf      cr7*4+3,9f
 238 err1;   ld      r0,0(r4)
 239 err1;   ld      r6,8(r4)
 240         addi    r4,r4,16
 241 err1;   std     r0,0(r3)
 242 err1;   std     r6,8(r3)
 243         addi    r3,r3,16
 244
 245 9:      clrldi  r5,r5,(64-4)
 246
 247         /* Up to 15B to go */
 248 .Lshort_copy:
 249         mtocrf  0x01,r5
 250         bf      cr7*4+0,12f
 251 err1;   lwz     r0,0(r4)        /* Less chance of a reject with word ops */
 252 err1;   lwz     r6,4(r4)
 253         addi    r4,r4,8
 254 err1;   stw     r0,0(r3)
 255 err1;   stw     r6,4(r3)
 256         addi    r3,r3,8
 257
 258 12:     bf      cr7*4+1,13f
 259 err1;   lwz     r0,0(r4)
 260         addi    r4,r4,4
 261 err1;   stw     r0,0(r3)
 262         addi    r3,r3,4
 263
 264 13:     bf      cr7*4+2,14f
 265 err1;   lhz     r0,0(r4)
 266         addi    r4,r4,2
 267 err1;   sth     r0,0(r3)
 268         addi    r3,r3,2
 269
 270 14:     bf      cr7*4+3,15f
 271 err1;   lbz     r0,0(r4)
 272 err1;   stb     r0,0(r3)
 273
 274 15:     li      r3,0
 275         blr
 276
 277 .Lunwind_stack_nonvmx_copy:
 278         addi    r1,r1,STACKFRAMESIZE
 279         b       .Lnonvmx_copy
 280
 281 #ifdef CONFIG_ALTIVEC
 282 .Lvmx_copy:
 283         mflr    r0
 284         std     r0,16(r1)
 285         stdu    r1,-STACKFRAMESIZE(r1)
 286         bl      enter_vmx_usercopy
 287         cmpwi   cr1,r3,0
 288         ld      r0,STACKFRAMESIZE+16(r1)
 289         ld      r3,STK_REG(R31)(r1)
 290         ld      r4,STK_REG(R30)(r1)
 291         ld      r5,STK_REG(R29)(r1)
 292         mtlr    r0
 293
 294         /*
 295          * We prefetch both the source and destination using enhanced touch
 296          * instructions. We use a stream ID of 0 for the load side and
 297          * 1 for the store side.
 298          */
 299         clrrdi  r6,r4,7
 300         clrrdi  r9,r3,7
 301         ori     r9,r9,1         /* stream=1 */
 302
 303         srdi    r7,r5,7         /* length in cachelines, capped at 0x3FF */
 304         cmpldi  r7,0x3FF
 305         ble     1f
 306         li      r7,0x3FF
 307 1:      lis     r0,0x0E00       /* depth=7 */
 308         sldi    r7,r7,7
 309         or      r7,r7,r0
 310         ori     r10,r7,1        /* stream=1 */
 311
 312         lis     r8,0x8000       /* GO=1 */
 313         clrldi  r8,r8,32
 314
 315 .machine push
 316 .machine "power4"
 317         /* setup read stream 0 */
 318         dcbt    0,r6,0b01000   /* addr from */
 319         dcbt    0,r7,0b01010   /* length and depth from */
 320         /* setup write stream 1 */
 321         dcbtst  0,r9,0b01000   /* addr to */
 322         dcbtst  0,r10,0b01010  /* length and depth to */
 323         eieio
 324         dcbt    0,r8,0b01010    /* all streams GO */
 325 .machine pop
 326
 327         beq     cr1,.Lunwind_stack_nonvmx_copy
 328
 329         /*
 330          * If source and destination are not relatively aligned we use a
 331          * slower permute loop.
 332          */
 333         xor     r6,r4,r3
 334         rldicl. r6,r6,0,(64-4)
 335         bne     .Lvmx_unaligned_copy
 336
 337         /* Get the destination 16B aligned */
 338         neg     r6,r3
 339         mtocrf  0x01,r6
 340         clrldi  r6,r6,(64-4)
 341
 342         bf      cr7*4+3,1f
 343 err3;   lbz     r0,0(r4)
 344         addi    r4,r4,1
 345 err3;   stb     r0,0(r3)
 346         addi    r3,r3,1
 347
 348 1:      bf      cr7*4+2,2f
 349 err3;   lhz     r0,0(r4)
 350         addi    r4,r4,2
 351 err3;   sth     r0,0(r3)
 352         addi    r3,r3,2
 353
 354 2:      bf      cr7*4+1,3f
 355 err3;   lwz     r0,0(r4)
 356         addi    r4,r4,4
 357 err3;   stw     r0,0(r3)
 358         addi    r3,r3,4
 359
 360 3:      bf      cr7*4+0,4f
 361 err3;   ld      r0,0(r4)
 362         addi    r4,r4,8
 363 err3;   std     r0,0(r3)
 364         addi    r3,r3,8
 365
 366 4:      sub     r5,r5,r6
 367
 368         /* Get the desination 128B aligned */
 369         neg     r6,r3
 370         srdi    r7,r6,4
 371         mtocrf  0x01,r7
 372         clrldi  r6,r6,(64-7)
 373
 374         li      r9,16
 375         li      r10,32
 376         li      r11,48
 377
 378         bf      cr7*4+3,5f
 379 err3;   lvx     v1,0,r4
 380         addi    r4,r4,16
 381 err3;   stvx    v1,0,r3
 382         addi    r3,r3,16
 383
 384 5:      bf      cr7*4+2,6f
 385 err3;   lvx     v1,0,r4
 386 err3;   lvx     v0,r4,r9
 387         addi    r4,r4,32
 388 err3;   stvx    v1,0,r3
 389 err3;   stvx    v0,r3,r9
 390         addi    r3,r3,32
 391
 392 6:      bf      cr7*4+1,7f
 393 err3;   lvx     v3,0,r4
 394 err3;   lvx     v2,r4,r9
 395 err3;   lvx     v1,r4,r10
 396 err3;   lvx     v0,r4,r11
 397         addi    r4,r4,64
 398 err3;   stvx    v3,0,r3
 399 err3;   stvx    v2,r3,r9
 400 err3;   stvx    v1,r3,r10
 401 err3;   stvx    v0,r3,r11
 402         addi    r3,r3,64
 403
 404 7:      sub     r5,r5,r6
 405         srdi    r6,r5,7
 406
 407         std     r14,STK_REG(R14)(r1)
 408         std     r15,STK_REG(R15)(r1)
 409         std     r16,STK_REG(R16)(r1)
 410
 411         li      r12,64
 412         li      r14,80
 413         li      r15,96
 414         li      r16,112
 415
 416         mtctr   r6
 417
 418         /*
 419          * Now do cacheline sized loads and stores. By this stage the
 420          * cacheline stores are also cacheline aligned.
 421          */
 422         .align  5
 423 8:
 424 err4;   lvx     v7,0,r4
 425 err4;   lvx     v6,r4,r9
 426 err4;   lvx     v5,r4,r10
 427 err4;   lvx     v4,r4,r11
 428 err4;   lvx     v3,r4,r12
 429 err4;   lvx     v2,r4,r14
 430 err4;   lvx     v1,r4,r15
 431 err4;   lvx     v0,r4,r16
 432         addi    r4,r4,128
 433 err4;   stvx    v7,0,r3
 434 err4;   stvx    v6,r3,r9
 435 err4;   stvx    v5,r3,r10
 436 err4;   stvx    v4,r3,r11
 437 err4;   stvx    v3,r3,r12
 438 err4;   stvx    v2,r3,r14
 439 err4;   stvx    v1,r3,r15
 440 err4;   stvx    v0,r3,r16
 441         addi    r3,r3,128
 442         bdnz    8b
 443
 444         ld      r14,STK_REG(R14)(r1)
 445         ld      r15,STK_REG(R15)(r1)
 446         ld      r16,STK_REG(R16)(r1)
 447
 448         /* Up to 127B to go */
 449         clrldi  r5,r5,(64-7)
 450         srdi    r6,r5,4
 451         mtocrf  0x01,r6
 452
 453         bf      cr7*4+1,9f
 454 err3;   lvx     v3,0,r4
 455 err3;   lvx     v2,r4,r9
 456 err3;   lvx     v1,r4,r10
 457 err3;   lvx     v0,r4,r11
 458         addi    r4,r4,64
 459 err3;   stvx    v3,0,r3
 460 err3;   stvx    v2,r3,r9
 461 err3;   stvx    v1,r3,r10
 462 err3;   stvx    v0,r3,r11
 463         addi    r3,r3,64
 464
 465 9:      bf      cr7*4+2,10f
 466 err3;   lvx     v1,0,r4
 467 err3;   lvx     v0,r4,r9
 468         addi    r4,r4,32
 469 err3;   stvx    v1,0,r3
 470 err3;   stvx    v0,r3,r9
 471         addi    r3,r3,32
 472
 473 10:     bf      cr7*4+3,11f
 474 err3;   lvx     v1,0,r4
 475         addi    r4,r4,16
 476 err3;   stvx    v1,0,r3
 477         addi    r3,r3,16
 478
 479         /* Up to 15B to go */
 480 11:     clrldi  r5,r5,(64-4)
 481         mtocrf  0x01,r5
 482         bf      cr7*4+0,12f
 483 err3;   ld      r0,0(r4)
 484         addi    r4,r4,8
 485 err3;   std     r0,0(r3)
 486         addi    r3,r3,8
 487
 488 12:     bf      cr7*4+1,13f
 489 err3;   lwz     r0,0(r4)
 490         addi    r4,r4,4
 491 err3;   stw     r0,0(r3)
 492         addi    r3,r3,4
 493
 494 13:     bf      cr7*4+2,14f
 495 err3;   lhz     r0,0(r4)
 496         addi    r4,r4,2
 497 err3;   sth     r0,0(r3)
 498         addi    r3,r3,2
 499
 500 14:     bf      cr7*4+3,15f
 501 err3;   lbz     r0,0(r4)
 502 err3;   stb     r0,0(r3)
 503
 504 15:     addi    r1,r1,STACKFRAMESIZE
 505         b       exit_vmx_usercopy       /* tail call optimise */
 506
 507 .Lvmx_unaligned_copy:
 508         /* Get the destination 16B aligned */
 509         neg     r6,r3
 510         mtocrf  0x01,r6
 511         clrldi  r6,r6,(64-4)
 512
 513         bf      cr7*4+3,1f
 514 err3;   lbz     r0,0(r4)
 515         addi    r4,r4,1
 516 err3;   stb     r0,0(r3)
 517         addi    r3,r3,1
 518
 519 1:      bf      cr7*4+2,2f
 520 err3;   lhz     r0,0(r4)
 521         addi    r4,r4,2
 522 err3;   sth     r0,0(r3)
 523         addi    r3,r3,2
 524
 525 2:      bf      cr7*4+1,3f
 526 err3;   lwz     r0,0(r4)
 527         addi    r4,r4,4
 528 err3;   stw     r0,0(r3)
 529         addi    r3,r3,4
 530
 531 3:      bf      cr7*4+0,4f
 532 err3;   lwz     r0,0(r4)        /* Less chance of a reject with word ops */
 533 err3;   lwz     r7,4(r4)
 534         addi    r4,r4,8
 535 err3;   stw     r0,0(r3)
 536 err3;   stw     r7,4(r3)
 537         addi    r3,r3,8
 538
 539 4:      sub     r5,r5,r6
 540
 541         /* Get the desination 128B aligned */
 542         neg     r6,r3
 543         srdi    r7,r6,4
 544         mtocrf  0x01,r7
 545         clrldi  r6,r6,(64-7)
 546
 547         li      r9,16
 548         li      r10,32
 549         li      r11,48
 550
 551         LVS(v16,0,r4)           /* Setup permute control vector */
 552 err3;   lvx     v0,0,r4
 553         addi    r4,r4,16
 554
 555         bf      cr7*4+3,5f
 556 err3;   lvx     v1,0,r4
 557         VPERM(v8,v0,v1,v16)
 558         addi    r4,r4,16
 559 err3;   stvx    v8,0,r3
 560         addi    r3,r3,16
 561         vor     v0,v1,v1
 562
 563 5:      bf      cr7*4+2,6f
 564 err3;   lvx     v1,0,r4
 565         VPERM(v8,v0,v1,v16)
 566 err3;   lvx     v0,r4,r9
 567         VPERM(v9,v1,v0,v16)
 568         addi    r4,r4,32
 569 err3;   stvx    v8,0,r3
 570 err3;   stvx    v9,r3,r9
 571         addi    r3,r3,32
 572
 573 6:      bf      cr7*4+1,7f
 574 err3;   lvx     v3,0,r4
 575         VPERM(v8,v0,v3,v16)
 576 err3;   lvx     v2,r4,r9
 577         VPERM(v9,v3,v2,v16)
 578 err3;   lvx     v1,r4,r10
 579         VPERM(v10,v2,v1,v16)
 580 err3;   lvx     v0,r4,r11
 581         VPERM(v11,v1,v0,v16)
 582         addi    r4,r4,64
 583 err3;   stvx    v8,0,r3
 584 err3;   stvx    v9,r3,r9
 585 err3;   stvx    v10,r3,r10
 586 err3;   stvx    v11,r3,r11
 587         addi    r3,r3,64
 588
 589 7:      sub     r5,r5,r6
 590         srdi    r6,r5,7
 591
 592         std     r14,STK_REG(R14)(r1)
 593         std     r15,STK_REG(R15)(r1)
 594         std     r16,STK_REG(R16)(r1)
 595
 596         li      r12,64
 597         li      r14,80
 598         li      r15,96
 599         li      r16,112
 600
 601         mtctr   r6
 602
 603         /*
 604          * Now do cacheline sized loads and stores. By this stage the
 605          * cacheline stores are also cacheline aligned.
 606          */
 607         .align  5
 608 8:
 609 err4;   lvx     v7,0,r4
 610         VPERM(v8,v0,v7,v16)
 611 err4;   lvx     v6,r4,r9
 612         VPERM(v9,v7,v6,v16)
 613 err4;   lvx     v5,r4,r10
 614         VPERM(v10,v6,v5,v16)
 615 err4;   lvx     v4,r4,r11
 616         VPERM(v11,v5,v4,v16)
 617 err4;   lvx     v3,r4,r12
 618         VPERM(v12,v4,v3,v16)
 619 err4;   lvx     v2,r4,r14
 620         VPERM(v13,v3,v2,v16)
 621 err4;   lvx     v1,r4,r15
 622         VPERM(v14,v2,v1,v16)
 623 err4;   lvx     v0,r4,r16
 624         VPERM(v15,v1,v0,v16)
 625         addi    r4,r4,128
 626 err4;   stvx    v8,0,r3
 627 err4;   stvx    v9,r3,r9
 628 err4;   stvx    v10,r3,r10
 629 err4;   stvx    v11,r3,r11
 630 err4;   stvx    v12,r3,r12
 631 err4;   stvx    v13,r3,r14
 632 err4;   stvx    v14,r3,r15
 633 err4;   stvx    v15,r3,r16
 634         addi    r3,r3,128
 635         bdnz    8b
 636
 637         ld      r14,STK_REG(R14)(r1)
 638         ld      r15,STK_REG(R15)(r1)
 639         ld      r16,STK_REG(R16)(r1)
 640
 641         /* Up to 127B to go */
 642         clrldi  r5,r5,(64-7)
 643         srdi    r6,r5,4
 644         mtocrf  0x01,r6
 645
 646         bf      cr7*4+1,9f
 647 err3;   lvx     v3,0,r4
 648         VPERM(v8,v0,v3,v16)
 649 err3;   lvx     v2,r4,r9
 650         VPERM(v9,v3,v2,v16)
 651 err3;   lvx     v1,r4,r10
 652         VPERM(v10,v2,v1,v16)
 653 err3;   lvx     v0,r4,r11
 654         VPERM(v11,v1,v0,v16)
 655         addi    r4,r4,64
 656 err3;   stvx    v8,0,r3
 657 err3;   stvx    v9,r3,r9
 658 err3;   stvx    v10,r3,r10
 659 err3;   stvx    v11,r3,r11
 660         addi    r3,r3,64
 661
 662 9:      bf      cr7*4+2,10f
 663 err3;   lvx     v1,0,r4
 664         VPERM(v8,v0,v1,v16)
 665 err3;   lvx     v0,r4,r9
 666         VPERM(v9,v1,v0,v16)
 667         addi    r4,r4,32
 668 err3;   stvx    v8,0,r3
 669 err3;   stvx    v9,r3,r9
 670         addi    r3,r3,32
 671
 672 10:     bf      cr7*4+3,11f
 673 err3;   lvx     v1,0,r4
 674         VPERM(v8,v0,v1,v16)
 675         addi    r4,r4,16
 676 err3;   stvx    v8,0,r3
 677         addi    r3,r3,16
 678
 679         /* Up to 15B to go */
 680 11:     clrldi  r5,r5,(64-4)
 681         addi    r4,r4,-16       /* Unwind the +16 load offset */
 682         mtocrf  0x01,r5
 683         bf      cr7*4+0,12f
 684 err3;   lwz     r0,0(r4)        /* Less chance of a reject with word ops */
 685 err3;   lwz     r6,4(r4)
 686         addi    r4,r4,8
 687 err3;   stw     r0,0(r3)
 688 err3;   stw     r6,4(r3)
 689         addi    r3,r3,8
 690
 691 12:     bf      cr7*4+1,13f
 692 err3;   lwz     r0,0(r4)
 693         addi    r4,r4,4
 694 err3;   stw     r0,0(r3)
 695         addi    r3,r3,4
 696
 697 13:     bf      cr7*4+2,14f
 698 err3;   lhz     r0,0(r4)
 699         addi    r4,r4,2
 700 err3;   sth     r0,0(r3)
 701         addi    r3,r3,2
 702
 703 14:     bf      cr7*4+3,15f
 704 err3;   lbz     r0,0(r4)
 705 err3;   stb     r0,0(r3)
 706
 707 15:     addi    r1,r1,STACKFRAMESIZE
 708         b       exit_vmx_usercopy       /* tail call optimise */
 709 #endif /* CONFIG_ALTIVEC */