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

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * String handling functions for PowerPC.
   4 *
   5 * Copyright (C) 1996 Paul Mackerras.
   6 */
   7#include <ppc_asm.tmpl>
   8#include <linux/errno.h>
   9
  10        .globl  strcpy
  11strcpy:
  12        addi    r5,r3,-1
  13        addi    r4,r4,-1
  141:      lbzu    r0,1(r4)
  15        cmpwi   0,r0,0
  16        stbu    r0,1(r5)
  17        bne     1b
  18        blr
  19
  20        .globl  strncpy
  21strncpy:
  22        cmpwi   0,r5,0
  23        beqlr
  24        mtctr   r5
  25        addi    r6,r3,-1
  26        addi    r4,r4,-1
  271:      lbzu    r0,1(r4)
  28        cmpwi   0,r0,0
  29        stbu    r0,1(r6)
  30        bdnzf   2,1b            /* dec ctr, branch if ctr != 0 && !cr0.eq */
  31        blr
  32
  33        .globl  strcat
  34strcat:
  35        addi    r5,r3,-1
  36        addi    r4,r4,-1
  371:      lbzu    r0,1(r5)
  38        cmpwi   0,r0,0
  39        bne     1b
  40        addi    r5,r5,-1
  411:      lbzu    r0,1(r4)
  42        cmpwi   0,r0,0
  43        stbu    r0,1(r5)
  44        bne     1b
  45        blr
  46
  47        .globl  strcmp
  48strcmp:
  49        addi    r5,r3,-1
  50        addi    r4,r4,-1
  511:      lbzu    r3,1(r5)
  52        cmpwi   1,r3,0
  53        lbzu    r0,1(r4)
  54        subf.   r3,r0,r3
  55        beqlr   1
  56        beq     1b
  57        blr
  58
  59        .globl  strlen
  60strlen:
  61        addi    r4,r3,-1
  621:      lbzu    r0,1(r4)
  63        cmpwi   0,r0,0
  64        bne     1b
  65        subf    r3,r3,r4
  66        blr
  67
  68        .globl  memset
  69memset:
  70        rlwimi  r4,r4,8,16,23
  71        rlwimi  r4,r4,16,0,15
  72        addi    r6,r3,-4
  73        cmplwi  0,r5,4
  74        blt     7f
  75        stwu    r4,4(r6)
  76        beqlr
  77        andi.   r0,r6,3
  78        add     r5,r0,r5
  79        subf    r6,r0,r6
  80        rlwinm  r0,r5,32-2,2,31
  81        mtctr   r0
  82        bdz     6f
  831:      stwu    r4,4(r6)
  84        bdnz    1b
  856:      andi.   r5,r5,3
  867:      cmpwi   0,r5,0
  87        beqlr
  88        mtctr   r5
  89        addi    r6,r6,3
  908:      stbu    r4,1(r6)
  91        bdnz    8b
  92        blr
  93
  94        .globl  memmove
  95memmove:
  96        cmplw   0,r3,r4
  97        bgt     backwards_memcpy
  98        /* fall through */
  99
 100        .globl  memcpy
 101memcpy:
 102        rlwinm. r7,r5,32-3,3,31         /* r0 = r5 >> 3 */
 103        addi    r6,r3,-4
 104        addi    r4,r4,-4
 105        beq     2f                      /* if less than 8 bytes to do */
 106        andi.   r0,r6,3                 /* get dest word aligned */
 107        mtctr   r7
 108        bne     5f
 1091:      lwz     r7,4(r4)
 110        lwzu    r8,8(r4)
 111        stw     r7,4(r6)
 112        stwu    r8,8(r6)
 113        bdnz    1b
 114        andi.   r5,r5,7
 1152:      cmplwi  0,r5,4
 116        blt     3f
 117        lwzu    r0,4(r4)
 118        addi    r5,r5,-4
 119        stwu    r0,4(r6)
 1203:      cmpwi   0,r5,0
 121        beqlr
 122        mtctr   r5
 123        addi    r4,r4,3
 124        addi    r6,r6,3
 1254:      lbzu    r0,1(r4)
 126        stbu    r0,1(r6)
 127        bdnz    4b
 128        blr
 1295:      subfic  r0,r0,4
 130        mtctr   r0
 1316:      lbz     r7,4(r4)
 132        addi    r4,r4,1
 133        stb     r7,4(r6)
 134        addi    r6,r6,1
 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
 142        .globl  backwards_memcpy
 143backwards_memcpy:
 144        rlwinm. r7,r5,32-3,3,31         /* r0 = r5 >> 3 */
 145        add     r6,r3,r5
 146        add     r4,r4,r5
 147        beq     2f
 148        andi.   r0,r6,3
 149        mtctr   r7
 150        bne     5f
 1511:      lwz     r7,-4(r4)
 152        lwzu    r8,-8(r4)
 153        stw     r7,-4(r6)
 154        stwu    r8,-8(r6)
 155        bdnz    1b
 156        andi.   r5,r5,7
 1572:      cmplwi  0,r5,4
 158        blt     3f
 159        lwzu    r0,-4(r4)
 160        subi    r5,r5,4
 161        stwu    r0,-4(r6)
 1623:      cmpwi   0,r5,0
 163        beqlr
 164        mtctr   r5
 1654:      lbzu    r0,-1(r4)
 166        stbu    r0,-1(r6)
 167        bdnz    4b
 168        blr
 1695:      mtctr   r0
 1706:      lbzu    r7,-1(r4)
 171        stbu    r7,-1(r6)
 172        bdnz    6b
 173        subf    r5,r0,r5
 174        rlwinm. r7,r5,32-3,3,31
 175        beq     2b
 176        mtctr   r7
 177        b       1b
 178
 179        .globl  memcmp
 180memcmp:
 181        cmpwi   0,r5,0
 182        ble-    2f
 183        mtctr   r5
 184        addi    r6,r3,-1
 185        addi    r4,r4,-1
 1861:      lbzu    r3,1(r6)
 187        lbzu    r0,1(r4)
 188        subf.   r3,r0,r3
 189        bdnzt   2,1b
 190        blr
 1912:      li      r3,0
 192        blr
 193
 194        .global memchr
 195memchr:
 196        cmpwi   0,r5,0
 197        ble-    2f
 198        mtctr   r5
 199        addi    r3,r3,-1
 2001:      lbzu    r0,1(r3)
 201        cmpw    0,r0,r4
 202        bdnzf   2,1b
 203        beqlr
 2042:      li      r3,0
 205        blr
 206