arch/powerpc/lib/mem_64.S

   1 /*
   2  * String handling functions for PowerPC.
   3  *
   4  * Copyright (C) 1996 Paul Mackerras.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #include <asm/processor.h>
  12 #include <asm/errno.h>
  13 #include <asm/ppc_asm.h>
  14 #include <asm/export.h>
  15
  16 _GLOBAL(__memset16)
  17         rlwimi  r4,r4,16,0,15
  18         /* fall through */
  19
  20 _GLOBAL(__memset32)
  21         rldimi  r4,r4,32,0
  22         /* fall through */
  23
  24 _GLOBAL(__memset64)
  25         neg     r0,r3
  26         andi.   r0,r0,7
  27         cmplw   cr1,r5,r0
  28         b       .Lms
  29 EXPORT_SYMBOL(__memset16)
  30 EXPORT_SYMBOL(__memset32)
  31 EXPORT_SYMBOL(__memset64)
  32
  33 _GLOBAL(memset)
  34         neg     r0,r3
  35         rlwimi  r4,r4,8,16,23
  36         andi.   r0,r0,7                 /* # bytes to be 8-byte aligned */
  37         rlwimi  r4,r4,16,0,15
  38         cmplw   cr1,r5,r0               /* do we get that far? */
  39         rldimi  r4,r4,32,0
  40 .Lms:   PPC_MTOCRF(1,r0)
  41         mr      r6,r3
  42         blt     cr1,8f
  43         beq+    3f                      /* if already 8-byte aligned */
  44         subf    r5,r0,r5
  45         bf      31,1f
  46         stb     r4,0(r6)
  47         addi    r6,r6,1
  48 1:      bf      30,2f
  49         sth     r4,0(r6)
  50         addi    r6,r6,2
  51 2:      bf      29,3f
  52         stw     r4,0(r6)
  53         addi    r6,r6,4
  54 3:      srdi.   r0,r5,6
  55         clrldi  r5,r5,58
  56         mtctr   r0
  57         beq     5f
  58         .balign 16
  59 4:      std     r4,0(r6)
  60         std     r4,8(r6)
  61         std     r4,16(r6)
  62         std     r4,24(r6)
  63         std     r4,32(r6)
  64         std     r4,40(r6)
  65         std     r4,48(r6)
  66         std     r4,56(r6)
  67         addi    r6,r6,64
  68         bdnz    4b
  69 5:      srwi.   r0,r5,3
  70         clrlwi  r5,r5,29
  71         PPC_MTOCRF(1,r0)
  72         beq     8f
  73         bf      29,6f
  74         std     r4,0(r6)
  75         std     r4,8(r6)
  76         std     r4,16(r6)
  77         std     r4,24(r6)
  78         addi    r6,r6,32
  79 6:      bf      30,7f
  80         std     r4,0(r6)
  81         std     r4,8(r6)
  82         addi    r6,r6,16
  83 7:      bf      31,8f
  84         std     r4,0(r6)
  85         addi    r6,r6,8
  86 8:      cmpwi   r5,0
  87         PPC_MTOCRF(1,r5)
  88         beqlr+
  89         bf      29,9f
  90         stw     r4,0(r6)
  91         addi    r6,r6,4
  92 9:      bf      30,10f
  93         sth     r4,0(r6)
  94         addi    r6,r6,2
  95 10:     bflr    31
  96         stb     r4,0(r6)
  97         blr
  98 EXPORT_SYMBOL(memset)
  99
 100 _GLOBAL_TOC(memmove)
 101         cmplw   0,r3,r4
 102         bgt     backwards_memcpy
 103         b       memcpy
 104
 105 _GLOBAL(backwards_memcpy)
 106         rlwinm. r7,r5,32-3,3,31         /* r0 = r5 >> 3 */
 107         add     r6,r3,r5
 108         add     r4,r4,r5
 109         beq     2f
 110         andi.   r0,r6,3
 111         mtctr   r7
 112         bne     5f
 113         .balign 16
 114 1:      lwz     r7,-4(r4)
 115         lwzu    r8,-8(r4)
 116         stw     r7,-4(r6)
 117         stwu    r8,-8(r6)
 118         bdnz    1b
 119         andi.   r5,r5,7
 120 2:      cmplwi  0,r5,4
 121         blt     3f
 122         lwzu    r0,-4(r4)
 123         subi    r5,r5,4
 124         stwu    r0,-4(r6)
 125 3:      cmpwi   0,r5,0
 126         beqlr
 127         mtctr   r5
 128 4:      lbzu    r0,-1(r4)
 129         stbu    r0,-1(r6)
 130         bdnz    4b
 131         blr
 132 5:      mtctr   r0
 133 6:      lbzu    r7,-1(r4)
 134         stbu    r7,-1(r6)
 135         bdnz    6b
 136         subf    r5,r0,r5
 137         rlwinm. r7,r5,32-3,3,31
 138         beq     2b
 139         mtctr   r7
 140         b       1b
 141 EXPORT_SYMBOL(memmove)