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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 | /* * Copyright (C) Paul Mackerras 1997. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * NOTE: this code runs in 32 bit mode and is packaged as ELF32. */ #include "ppc_asm.h" .text .globl strcpy strcpy: addi r5,r3,-1 addi r4,r4,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 stbu r0,1(r5) bne 1b blr .globl strncpy strncpy: cmpwi 0,r5,0 beqlr mtctr r5 addi r6,r3,-1 addi r4,r4,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 stbu r0,1(r6) bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ blr .globl strcat strcat: addi r5,r3,-1 addi r4,r4,-1 1: lbzu r0,1(r5) cmpwi 0,r0,0 bne 1b addi r5,r5,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 stbu r0,1(r5) bne 1b blr .globl strchr strchr: addi r3,r3,-1 1: lbzu r0,1(r3) cmpw 0,r0,r4 beqlr cmpwi 0,r0,0 bne 1b li r3,0 blr .globl strcmp strcmp: addi r5,r3,-1 addi r4,r4,-1 1: lbzu r3,1(r5) cmpwi 1,r3,0 lbzu r0,1(r4) subf. r3,r0,r3 beqlr 1 beq 1b blr .globl strncmp strncmp: mtctr r5 addi r5,r3,-1 addi r4,r4,-1 1: lbzu r3,1(r5) cmpwi 1,r3,0 lbzu r0,1(r4) subf. r3,r0,r3 beqlr 1 bdnzt eq,1b blr .globl strlen strlen: addi r4,r3,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 bne 1b subf r3,r3,r4 blr .globl memset memset: rlwimi r4,r4,8,16,23 rlwimi r4,r4,16,0,15 addi r6,r3,-4 cmplwi 0,r5,4 blt 7f stwu r4,4(r6) beqlr andi. r0,r6,3 add r5,r0,r5 subf r6,r0,r6 rlwinm r0,r5,32-2,2,31 mtctr r0 bdz 6f 1: stwu r4,4(r6) bdnz 1b 6: andi. r5,r5,3 7: cmpwi 0,r5,0 beqlr mtctr r5 addi r6,r6,3 8: stbu r4,1(r6) bdnz 8b blr .globl memmove memmove: cmplw 0,r3,r4 bgt backwards_memcpy /* fall through */ .globl memcpy memcpy: rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ addi r6,r3,-4 addi r4,r4,-4 beq 3f /* if less than 8 bytes to do */ andi. r0,r6,3 /* get dest word aligned */ mtctr r7 bne 5f andi. r0,r4,3 /* check src word aligned too */ bne 3f 1: lwz r7,4(r4) lwzu r8,8(r4) stw r7,4(r6) stwu r8,8(r6) bdnz 1b andi. r5,r5,7 2: cmplwi 0,r5,4 blt 3f lwzu r0,4(r4) addi r5,r5,-4 stwu r0,4(r6) 3: cmpwi 0,r5,0 beqlr mtctr r5 addi r4,r4,3 addi r6,r6,3 4: lbzu r0,1(r4) stbu r0,1(r6) bdnz 4b blr 5: subfic r0,r0,4 cmpw cr1,r0,r5 add r7,r0,r4 andi. r7,r7,3 /* will source be word-aligned too? */ ble cr1,3b bne 3b /* do byte-by-byte if not */ mtctr r0 6: lbz r7,4(r4) addi r4,r4,1 stb r7,4(r6) addi r6,r6,1 bdnz 6b subf r5,r0,r5 rlwinm. r7,r5,32-3,3,31 beq 2b mtctr r7 b 1b .globl backwards_memcpy backwards_memcpy: rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ add r6,r3,r5 add r4,r4,r5 beq 3f andi. r0,r6,3 mtctr r7 bne 5f andi. r0,r4,3 bne 3f 1: lwz r7,-4(r4) lwzu r8,-8(r4) stw r7,-4(r6) stwu r8,-8(r6) bdnz 1b andi. r5,r5,7 2: cmplwi 0,r5,4 blt 3f lwzu r0,-4(r4) subi r5,r5,4 stwu r0,-4(r6) 3: cmpwi 0,r5,0 beqlr mtctr r5 4: lbzu r0,-1(r4) stbu r0,-1(r6) bdnz 4b blr 5: cmpw cr1,r0,r5 subf r7,r0,r4 andi. r7,r7,3 ble cr1,3b bne 3b mtctr r0 6: lbzu r7,-1(r4) stbu r7,-1(r6) bdnz 6b subf r5,r0,r5 rlwinm. r7,r5,32-3,3,31 beq 2b mtctr r7 b 1b .globl memchr memchr: cmpwi 0,r5,0 blelr mtctr r5 addi r3,r3,-1 1: lbzu r0,1(r3) cmpw r0,r4 beqlr bdnz 1b li r3,0 blr .globl memcmp memcmp: cmpwi 0,r5,0 ble 2f mtctr r5 addi r6,r3,-1 addi r4,r4,-1 1: lbzu r3,1(r6) lbzu r0,1(r4) subf. r3,r0,r3 bdnzt 2,1b blr 2: li r3,0 blr /* * Flush the dcache and invalidate the icache for a range of addresses. * * flush_cache(addr, len) */ .global flush_cache flush_cache: addi 4,4,0x1f /* len = (len + 0x1f) / 0x20 */ rlwinm. 4,4,27,5,31 mtctr 4 beqlr 1: dcbf 0,3 icbi 0,3 addi 3,3,0x20 bdnz 1b sync isync blr |