1/* 2 * Copyright (C) Paul Mackerras 1997. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * NOTE: this code runs in 32 bit mode and is packaged as ELF32. 10 */ 11 12#include "ppc_asm.h" 13 14 .text 15 .globl strcpy 16strcpy: 17 addi r5,r3,-1 18 addi r4,r4,-1 191: lbzu r0,1(r4) 20 cmpwi 0,r0,0 21 stbu r0,1(r5) 22 bne 1b 23 blr 24 25 .globl strncpy 26strncpy: 27 cmpwi 0,r5,0 28 beqlr 29 mtctr r5 30 addi r6,r3,-1 31 addi r4,r4,-1 321: lbzu r0,1(r4) 33 cmpwi 0,r0,0 34 stbu r0,1(r6) 35 bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ 36 blr 37 38 .globl strcat 39strcat: 40 addi r5,r3,-1 41 addi r4,r4,-1 421: lbzu r0,1(r5) 43 cmpwi 0,r0,0 44 bne 1b 45 addi r5,r5,-1 461: lbzu r0,1(r4) 47 cmpwi 0,r0,0 48 stbu r0,1(r5) 49 bne 1b 50 blr 51 52 .globl strchr 53strchr: 54 addi r3,r3,-1 551: lbzu r0,1(r3) 56 cmpw 0,r0,r4 57 beqlr 58 cmpwi 0,r0,0 59 bne 1b 60 li r3,0 61 blr 62 63 .globl strcmp 64strcmp: 65 addi r5,r3,-1 66 addi r4,r4,-1 671: lbzu r3,1(r5) 68 cmpwi 1,r3,0 69 lbzu r0,1(r4) 70 subf. r3,r0,r3 71 beqlr 1 72 beq 1b 73 blr 74 75 .globl strncmp 76strncmp: 77 mtctr r5 78 addi r5,r3,-1 79 addi r4,r4,-1 801: lbzu r3,1(r5) 81 cmpwi 1,r3,0 82 lbzu r0,1(r4) 83 subf. r3,r0,r3 84 beqlr 1 85 bdnzt eq,1b 86 blr 87 88 .globl strlen 89strlen: 90 addi r4,r3,-1 911: lbzu r0,1(r4) 92 cmpwi 0,r0,0 93 bne 1b 94 subf r3,r3,r4 95 blr 96 97 .globl memset 98memset: 99 rlwimi r4,r4,8,16,23 100 rlwimi r4,r4,16,0,15 101 addi r6,r3,-4 102 cmplwi 0,r5,4 103 blt 7f 104 stwu r4,4(r6) 105 beqlr 106 andi. r0,r6,3 107 add r5,r0,r5 108 subf r6,r0,r6 109 rlwinm r0,r5,32-2,2,31 110 mtctr r0 111 bdz 6f 1121: stwu r4,4(r6) 113 bdnz 1b 1146: andi. r5,r5,3 1157: cmpwi 0,r5,0 116 beqlr 117 mtctr r5 118 addi r6,r6,3 1198: stbu r4,1(r6) 120 bdnz 8b 121 blr 122 123 .globl memmove 124memmove: 125 cmplw 0,r3,r4 126 bgt backwards_memcpy 127 /* fall through */ 128 129 .globl memcpy 130memcpy: 131 rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ 132 addi r6,r3,-4 133 addi r4,r4,-4 134 beq 3f /* if less than 8 bytes to do */ 135 andi. r0,r6,3 /* get dest word aligned */ 136 mtctr r7 137 bne 5f 138 andi. r0,r4,3 /* check src word aligned too */ 139 bne 3f 1401: lwz r7,4(r4) 141 lwzu r8,8(r4) 142 stw r7,4(r6) 143 stwu r8,8(r6) 144 bdnz 1b 145 andi. r5,r5,7 1462: cmplwi 0,r5,4 147 blt 3f 148 lwzu r0,4(r4) 149 addi r5,r5,-4 150 stwu r0,4(r6) 1513: cmpwi 0,r5,0 152 beqlr 153 mtctr r5 154 addi r4,r4,3 155 addi r6,r6,3 1564: lbzu r0,1(r4) 157 stbu r0,1(r6) 158 bdnz 4b 159 blr 1605: subfic r0,r0,4 161 cmpw cr1,r0,r5 162 add r7,r0,r4 163 andi. r7,r7,3 /* will source be word-aligned too? */ 164 ble cr1,3b 165 bne 3b /* do byte-by-byte if not */ 166 mtctr r0 1676: lbz r7,4(r4) 168 addi r4,r4,1 169 stb r7,4(r6) 170 addi r6,r6,1 171 bdnz 6b 172 subf r5,r0,r5 173 rlwinm. r7,r5,32-3,3,31 174 beq 2b 175 mtctr r7 176 b 1b 177 178 .globl backwards_memcpy 179backwards_memcpy: 180 rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ 181 add r6,r3,r5 182 add r4,r4,r5 183 beq 3f 184 andi. r0,r6,3 185 mtctr r7 186 bne 5f 187 andi. r0,r4,3 188 bne 3f 1891: lwz r7,-4(r4) 190 lwzu r8,-8(r4) 191 stw r7,-4(r6) 192 stwu r8,-8(r6) 193 bdnz 1b 194 andi. r5,r5,7 1952: cmplwi 0,r5,4 196 blt 3f 197 lwzu r0,-4(r4) 198 subi r5,r5,4 199 stwu r0,-4(r6) 2003: cmpwi 0,r5,0 201 beqlr 202 mtctr r5 2034: lbzu r0,-1(r4) 204 stbu r0,-1(r6) 205 bdnz 4b 206 blr 2075: cmpw cr1,r0,r5 208 subf r7,r0,r4 209 andi. r7,r7,3 210 ble cr1,3b 211 bne 3b 212 mtctr r0 2136: lbzu r7,-1(r4) 214 stbu r7,-1(r6) 215 bdnz 6b 216 subf r5,r0,r5 217 rlwinm. r7,r5,32-3,3,31 218 beq 2b 219 mtctr r7 220 b 1b 221 222 .globl memchr 223memchr: 224 cmpwi 0,r5,0 225 blelr 226 mtctr r5 227 addi r3,r3,-1 2281: lbzu r0,1(r3) 229 cmpw r0,r4 230 beqlr 231 bdnz 1b 232 li r3,0 233 blr 234 235 .globl memcmp 236memcmp: 237 cmpwi 0,r5,0 238 ble 2f 239 mtctr r5 240 addi r6,r3,-1 241 addi r4,r4,-1 2421: lbzu r3,1(r6) 243 lbzu r0,1(r4) 244 subf. r3,r0,r3 245 bdnzt 2,1b 246 blr 2472: li r3,0 248 blr 249 250 251/* 252 * Flush the dcache and invalidate the icache for a range of addresses. 253 * 254 * flush_cache(addr, len) 255 */ 256 .global flush_cache 257flush_cache: 258 addi 4,4,0x1f /* len = (len + 0x1f) / 0x20 */ 259 rlwinm. 4,4,27,5,31 260 mtctr 4 261 beqlr 2621: dcbf 0,3 263 icbi 0,3 264 addi 3,3,0x20 265 bdnz 1b 266 sync 267 isync 268 blr 269