LXR uboot/arch/powerpc/lib/ppcstring.S

   1/*
   2 * String handling functions for PowerPC.
   3 *
   4 * Copyright (C) 1996 Paul Mackerras.
   5 *
   6 * SPDX-License-Identifier:     GPL-2.0+
   7 */
   8#include <ppc_asm.tmpl>
   9#include <linux/errno.h>
  10
  11        .globl  strcpy
  12strcpy:
  13        addi    r5,r3,-1
  14        addi    r4,r4,-1
  151:      lbzu    r0,1(r4)
  16        cmpwi   0,r0,0
  17        stbu    r0,1(r5)
  18        bne     1b
  19        blr
  20
  21        .globl  strncpy
  22strncpy:
  23        cmpwi   0,r5,0
  24        beqlr
  25        mtctr   r5
  26        addi    r6,r3,-1
  27        addi    r4,r4,-1
  281:      lbzu    r0,1(r4)
  29        cmpwi   0,r0,0
  30        stbu    r0,1(r6)
  31        bdnzf   2,1b            /* dec ctr, branch if ctr != 0 && !cr0.eq */
  32        blr
  33
  34        .globl  strcat
  35strcat:
  36        addi    r5,r3,-1
  37        addi    r4,r4,-1
  381:      lbzu    r0,1(r5)
  39        cmpwi   0,r0,0
  40        bne     1b
  41        addi    r5,r5,-1
  421:      lbzu    r0,1(r4)
  43        cmpwi   0,r0,0
  44        stbu    r0,1(r5)
  45        bne     1b
  46        blr
  47
  48        .globl  strcmp
  49strcmp:
  50        addi    r5,r3,-1
  51        addi    r4,r4,-1
  521:      lbzu    r3,1(r5)
  53        cmpwi   1,r3,0
  54        lbzu    r0,1(r4)
  55        subf.   r3,r0,r3
  56        beqlr   1
  57        beq     1b
  58        blr
  59
  60        .globl  strlen
  61strlen:
  62        addi    r4,r3,-1
  631:      lbzu    r0,1(r4)
  64        cmpwi   0,r0,0
  65        bne     1b
  66        subf    r3,r3,r4
  67        blr
  68
  69        .globl  memset
  70memset:
  71        rlwimi  r4,r4,8,16,23
  72        rlwimi  r4,r4,16,0,15
  73        addi    r6,r3,-4
  74        cmplwi  0,r5,4
  75        blt     7f
  76        stwu    r4,4(r6)
  77        beqlr
  78        andi.   r0,r6,3
  79        add     r5,r0,r5
  80        subf    r6,r0,r6
  81        rlwinm  r0,r5,32-2,2,31
  82        mtctr   r0
  83        bdz     6f
  841:      stwu    r4,4(r6)
  85        bdnz    1b
  866:      andi.   r5,r5,3
  877:      cmpwi   0,r5,0
  88        beqlr
  89        mtctr   r5
  90        addi    r6,r6,3
  918:      stbu    r4,1(r6)
  92        bdnz    8b
  93        blr
  94
  95        .globl  memmove
  96memmove:
  97        cmplw   0,r3,r4
  98        bgt     backwards_memcpy
  99        /* fall through */
 100
 101        .globl  memcpy
 102memcpy:
 103        rlwinm. r7,r5,32-3,3,31         /* r0 = r5 >> 3 */
 104        addi    r6,r3,-4
 105        addi    r4,r4,-4
 106        beq     2f                      /* if less than 8 bytes to do */
 107        andi.   r0,r6,3                 /* get dest word aligned */
 108        mtctr   r7
 109        bne     5f
 1101:      lwz     r7,4(r4)
 111        lwzu    r8,8(r4)
 112        stw     r7,4(r6)
 113        stwu    r8,8(r6)
 114        bdnz    1b
 115        andi.   r5,r5,7
 1162:      cmplwi  0,r5,4
 117        blt     3f
 118        lwzu    r0,4(r4)
 119        addi    r5,r5,-4
 120        stwu    r0,4(r6)
 1213:      cmpwi   0,r5,0
 122        beqlr
 123        mtctr   r5
 124        addi    r4,r4,3
 125        addi    r6,r6,3
 1264:      lbzu    r0,1(r4)
 127        stbu    r0,1(r6)
 128        bdnz    4b
 129        blr
 1305:      subfic  r0,r0,4
 131        mtctr   r0
 1326:      lbz     r7,4(r4)
 133        addi    r4,r4,1
 134        stb     r7,4(r6)
 135        addi    r6,r6,1
 136        bdnz    6b
 137        subf    r5,r0,r5
 138        rlwinm. r7,r5,32-3,3,31
 139        beq     2b
 140        mtctr   r7
 141        b       1b
 142
 143        .globl  backwards_memcpy
 144backwards_memcpy:
 145        rlwinm. r7,r5,32-3,3,31         /* r0 = r5 >> 3 */
 146        add     r6,r3,r5
 147        add     r4,r4,r5
 148        beq     2f
 149        andi.   r0,r6,3
 150        mtctr   r7
 151        bne     5f
 1521:      lwz     r7,-4(r4)
 153        lwzu    r8,-8(r4)
 154        stw     r7,-4(r6)
 155        stwu    r8,-8(r6)
 156        bdnz    1b
 157        andi.   r5,r5,7
 1582:      cmplwi  0,r5,4
 159        blt     3f
 160        lwzu    r0,-4(r4)
 161        subi    r5,r5,4
 162        stwu    r0,-4(r6)
 1633:      cmpwi   0,r5,0
 164        beqlr
 165        mtctr   r5
 1664:      lbzu    r0,-1(r4)
 167        stbu    r0,-1(r6)
 168        bdnz    4b
 169        blr
 1705:      mtctr   r0
 1716:      lbzu    r7,-1(r4)
 172        stbu    r7,-1(r6)
 173        bdnz    6b
 174        subf    r5,r0,r5
 175        rlwinm. r7,r5,32-3,3,31
 176        beq     2b
 177        mtctr   r7
 178        b       1b
 179
 180        .globl  memcmp
 181memcmp:
 182        cmpwi   0,r5,0
 183        ble-    2f
 184        mtctr   r5
 185        addi    r6,r3,-1
 186        addi    r4,r4,-1
 1871:      lbzu    r3,1(r6)
 188        lbzu    r0,1(r4)
 189        subf.   r3,r0,r3
 190        bdnzt   2,1b
 191        blr
 1922:      li      r3,0
 193        blr
 194
 195        .global memchr
 196memchr:
 197        cmpwi   0,r5,0
 198        ble-    2f
 199        mtctr   r5
 200        addi    r3,r3,-1
 2011:      lbzu    r0,1(r3)
 202        cmpw    0,r0,r4
 203        bdnzf   2,1b
 204        beqlr
 2052:      li      r3,0
 206        blr
 207