| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | #define r0 0 |
| 12 | #define r3 3 |
| 13 | #define r4 4 |
| 14 | #define r5 5 |
| 15 | #define r6 6 |
| 16 | #define r7 7 |
| 17 | #define r8 8 |
| 18 | |
| 19 | .globl strlen |
| 20 | strlen: |
| 21 | addi r4,r3,-1 |
| 22 | 1: lbzu r0,1(r4) |
| 23 | cmpwi 0,r0,0 |
| 24 | bne 1b |
| 25 | subf r3,r3,r4 |
| 26 | blr |
| 27 | |
| 28 | .globl memset |
| 29 | memset: |
| 30 | rlwimi r4,r4,8,16,23 |
| 31 | rlwimi r4,r4,16,0,15 |
| 32 | addi r6,r3,-4 |
| 33 | cmplwi 0,r5,4 |
| 34 | blt 7f |
| 35 | stwu r4,4(r6) |
| 36 | beqlr |
| 37 | andi. r0,r6,3 |
| 38 | add r5,r0,r5 |
| 39 | subf r6,r0,r6 |
| 40 | rlwinm r0,r5,32-2,2,31 |
| 41 | mtctr r0 |
| 42 | bdz 6f |
| 43 | 1: stwu r4,4(r6) |
| 44 | bdnz 1b |
| 45 | 6: andi. r5,r5,3 |
| 46 | 7: cmpwi 0,r5,0 |
| 47 | beqlr |
| 48 | mtctr r5 |
| 49 | addi r6,r6,3 |
| 50 | 8: stbu r4,1(r6) |
| 51 | bdnz 8b |
| 52 | blr |
| 53 | |
| 54 | .globl memmove |
| 55 | memmove: |
| 56 | cmplw 0,r3,r4 |
| 57 | bgt backwards_memcpy |
| 58 | /* fall through */ |
| 59 | |
| 60 | .globl memcpy |
| 61 | memcpy: |
| 62 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ |
| 63 | addi r6,r3,-4 |
| 64 | addi r4,r4,-4 |
| 65 | beq 2f /* if less than 8 bytes to do */ |
| 66 | andi. r0,r6,3 /* get dest word aligned */ |
| 67 | mtctr r7 |
| 68 | bne 5f |
| 69 | 1: lwz r7,4(r4) |
| 70 | lwzu r8,8(r4) |
| 71 | stw r7,4(r6) |
| 72 | stwu r8,8(r6) |
| 73 | bdnz 1b |
| 74 | andi. r5,r5,7 |
| 75 | 2: cmplwi 0,r5,4 |
| 76 | blt 3f |
| 77 | lwzu r0,4(r4) |
| 78 | addi r5,r5,-4 |
| 79 | stwu r0,4(r6) |
| 80 | 3: cmpwi 0,r5,0 |
| 81 | beqlr |
| 82 | mtctr r5 |
| 83 | addi r4,r4,3 |
| 84 | addi r6,r6,3 |
| 85 | 4: lbzu r0,1(r4) |
| 86 | stbu r0,1(r6) |
| 87 | bdnz 4b |
| 88 | blr |
| 89 | 5: subfic r0,r0,4 |
| 90 | mtctr r0 |
| 91 | 6: lbz r7,4(r4) |
| 92 | addi r4,r4,1 |
| 93 | stb r7,4(r6) |
| 94 | addi r6,r6,1 |
| 95 | bdnz 6b |
| 96 | subf r5,r0,r5 |
| 97 | rlwinm. r7,r5,32-3,3,31 |
| 98 | beq 2b |
| 99 | mtctr r7 |
| 100 | b 1b |
| 101 | |
| 102 | .globl backwards_memcpy |
| 103 | backwards_memcpy: |
| 104 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ |
| 105 | add r6,r3,r5 |
| 106 | add r4,r4,r5 |
| 107 | beq 2f |
| 108 | andi. r0,r6,3 |
| 109 | mtctr r7 |
| 110 | bne 5f |
| 111 | 1: lwz r7,-4(r4) |
| 112 | lwzu r8,-8(r4) |
| 113 | stw r7,-4(r6) |
| 114 | stwu r8,-8(r6) |
| 115 | bdnz 1b |
| 116 | andi. r5,r5,7 |
| 117 | 2: cmplwi 0,r5,4 |
| 118 | blt 3f |
| 119 | lwzu r0,-4(r4) |
| 120 | subi r5,r5,4 |
| 121 | stwu r0,-4(r6) |
| 122 | 3: cmpwi 0,r5,0 |
| 123 | beqlr |
| 124 | mtctr r5 |
| 125 | 4: lbzu r0,-1(r4) |
| 126 | stbu r0,-1(r6) |
| 127 | bdnz 4b |
| 128 | blr |
| 129 | 5: mtctr r0 |
| 130 | 6: lbzu r7,-1(r4) |
| 131 | stbu r7,-1(r6) |
| 132 | bdnz 6b |
| 133 | subf r5,r0,r5 |
| 134 | rlwinm. r7,r5,32-3,3,31 |
| 135 | beq 2b |
| 136 | mtctr r7 |
| 137 | b 1b |
| 138 | |
| 139 | .globl memcmp |
| 140 | memcmp: |
| 141 | cmpwi 0,r5,0 |
| 142 | blelr |
| 143 | mtctr r5 |
| 144 | addi r6,r3,-1 |
| 145 | addi r4,r4,-1 |
| 146 | 1: lbzu r3,1(r6) |
| 147 | lbzu r0,1(r4) |
| 148 | subf. r3,r0,r3 |
| 149 | bdnzt 2,1b |
| 150 | blr |