projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 1da177e4 LT |
2 | /* |
| 3 | * Copyright (C) Paul Mackerras 1997. | |
| 4 | * | |
| 1da177e4 LT |
5 | * NOTE: this code runs in 32 bit mode and is packaged as ELF32. |
| 6 | */ | |
| 7 | ||
| decd300b | 8 | #include "ppc_asm.h" |
| 1da177e4 LT |
9 | |
| 10 | .text | |
| 11 | .globl strcpy | |
| 12 | strcpy: | |
| 13 | addi r5,r3,-1 | |
| 14 | addi r4,r4,-1 | |
| 15 | 1: lbzu r0,1(r4) | |
| 16 | cmpwi 0,r0,0 | |
| 17 | stbu r0,1(r5) | |
| 18 | bne 1b | |
| 19 | blr | |
| 20 | ||
| 21 | .globl strncpy | |
| 22 | strncpy: | |
| 23 | cmpwi 0,r5,0 | |
| 24 | beqlr | |
| 25 | mtctr r5 | |
| 26 | addi r6,r3,-1 | |
| 27 | addi r4,r4,-1 | |
| 28 | 1: 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 | |
| 35 | strcat: | |
| 36 | addi r5,r3,-1 | |
| 37 | addi r4,r4,-1 | |
| 38 | 1: lbzu r0,1(r5) | |
| 39 | cmpwi 0,r0,0 | |
| 40 | bne 1b | |
| 41 | addi r5,r5,-1 | |
| 42 | 1: lbzu r0,1(r4) | |
| 43 | cmpwi 0,r0,0 | |
| 44 | stbu r0,1(r5) | |
| 45 | bne 1b | |
| 46 | blr | |
| 47 | ||
| 0ae0b545 DG |
48 | .globl strchr |
| 49 | strchr: | |
| 50 | addi r3,r3,-1 | |
| 51 | 1: lbzu r0,1(r3) | |
| 52 | cmpw 0,r0,r4 | |
| 53 | beqlr | |
| 54 | cmpwi 0,r0,0 | |
| 55 | bne 1b | |
| 56 | li r3,0 | |
| 57 | blr | |
| 58 | ||
| 1da177e4 LT |
59 | .globl strcmp |
| 60 | strcmp: | |
| 61 | addi r5,r3,-1 | |
| 62 | addi r4,r4,-1 | |
| 63 | 1: lbzu r3,1(r5) | |
| 64 | cmpwi 1,r3,0 | |
| 65 | lbzu r0,1(r4) | |
| 66 | subf. r3,r0,r3 | |
| 67 | beqlr 1 | |
| 68 | beq 1b | |
| 69 | blr | |
| 70 | ||
| 0ae0b545 DG |
71 | .globl strncmp |
| 72 | strncmp: | |
| 73 | mtctr r5 | |
| 74 | addi r5,r3,-1 | |
| 75 | addi r4,r4,-1 | |
| 76 | 1: lbzu r3,1(r5) | |
| 77 | cmpwi 1,r3,0 | |
| 78 | lbzu r0,1(r4) | |
| 79 | subf. r3,r0,r3 | |
| 80 | beqlr 1 | |
| 81 | bdnzt eq,1b | |
| 82 | blr | |
| 83 | ||
| 1da177e4 LT |
84 | .globl strlen |
| 85 | strlen: | |
| 86 | addi r4,r3,-1 | |
| 87 | 1: lbzu r0,1(r4) | |
| 88 | cmpwi 0,r0,0 | |
| 89 | bne 1b | |
| 90 | subf r3,r3,r4 | |
| 91 | blr | |
| 92 | ||
| 93 | .globl memset | |
| 94 | memset: | |
| 95 | rlwimi r4,r4,8,16,23 | |
| 96 | rlwimi r4,r4,16,0,15 | |
| 97 | addi r6,r3,-4 | |
| 98 | cmplwi 0,r5,4 | |
| 99 | blt 7f | |
| 100 | stwu r4,4(r6) | |
| 101 | beqlr | |
| 102 | andi. r0,r6,3 | |
| 103 | add r5,r0,r5 | |
| 104 | subf r6,r0,r6 | |
| 105 | rlwinm r0,r5,32-2,2,31 | |
| 106 | mtctr r0 | |
| 107 | bdz 6f | |
| 108 | 1: stwu r4,4(r6) | |
| 109 | bdnz 1b | |
| 110 | 6: andi. r5,r5,3 | |
| 111 | 7: cmpwi 0,r5,0 | |
| 112 | beqlr | |
| 113 | mtctr r5 | |
| 114 | addi r6,r6,3 | |
| 115 | 8: stbu r4,1(r6) | |
| 116 | bdnz 8b | |
| 117 | blr | |
| 118 | ||
| 119 | .globl memmove | |
| 120 | memmove: | |
| 121 | cmplw 0,r3,r4 | |
| 122 | bgt backwards_memcpy | |
| 123 | /* fall through */ | |
| 124 | ||
| 125 | .globl memcpy | |
| 126 | memcpy: | |
| 844ae3a0 | 127 | rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ |
| 1da177e4 LT |
128 | addi r6,r3,-4 |
| 129 | addi r4,r4,-4 | |
| b4e7de0f | 130 | beq 3f /* if less than 8 bytes to do */ |
| 1da177e4 LT |
131 | andi. r0,r6,3 /* get dest word aligned */ |
| 132 | mtctr r7 | |
| 133 | bne 5f | |
| b4e7de0f PM |
134 | andi. r0,r4,3 /* check src word aligned too */ |
| 135 | bne 3f | |
| 1da177e4 LT |
136 | 1: lwz r7,4(r4) |
| 137 | lwzu r8,8(r4) | |
| 138 | stw r7,4(r6) | |
| 139 | stwu r8,8(r6) | |
| 140 | bdnz 1b | |
| 141 | andi. r5,r5,7 | |
| 142 | 2: cmplwi 0,r5,4 | |
| 143 | blt 3f | |
| 144 | lwzu r0,4(r4) | |
| 145 | addi r5,r5,-4 | |
| 146 | stwu r0,4(r6) | |
| 147 | 3: cmpwi 0,r5,0 | |
| 148 | beqlr | |
| 149 | mtctr r5 | |
| 150 | addi r4,r4,3 | |
| 151 | addi r6,r6,3 | |
| 152 | 4: lbzu r0,1(r4) | |
| 153 | stbu r0,1(r6) | |
| 154 | bdnz 4b | |
| 155 | blr | |
| 156 | 5: subfic r0,r0,4 | |
| b4e7de0f PM |
157 | cmpw cr1,r0,r5 |
| 158 | add r7,r0,r4 | |
| 159 | andi. r7,r7,3 /* will source be word-aligned too? */ | |
| 160 | ble cr1,3b | |
| 161 | bne 3b /* do byte-by-byte if not */ | |
| 1da177e4 LT |
162 | mtctr r0 |
| 163 | 6: lbz r7,4(r4) | |
| 164 | addi r4,r4,1 | |
| 165 | stb r7,4(r6) | |
| 166 | addi r6,r6,1 | |
| 167 | bdnz 6b | |
| 168 | subf r5,r0,r5 | |
| 169 | rlwinm. r7,r5,32-3,3,31 | |
| 170 | beq 2b | |
| 171 | mtctr r7 | |
| 172 | b 1b | |
| 173 | ||
| 174 | .globl backwards_memcpy | |
| 175 | backwards_memcpy: | |
| 844ae3a0 | 176 | rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ |
| 1da177e4 LT |
177 | add r6,r3,r5 |
| 178 | add r4,r4,r5 | |
| b4e7de0f | 179 | beq 3f |
| 1da177e4 LT |
180 | andi. r0,r6,3 |
| 181 | mtctr r7 | |
| 182 | bne 5f | |
| b4e7de0f PM |
183 | andi. r0,r4,3 |
| 184 | bne 3f | |
| 1da177e4 LT |
185 | 1: lwz r7,-4(r4) |
| 186 | lwzu r8,-8(r4) | |
| 187 | stw r7,-4(r6) | |
| 188 | stwu r8,-8(r6) | |
| 189 | bdnz 1b | |
| 190 | andi. r5,r5,7 | |
| 191 | 2: cmplwi 0,r5,4 | |
| 192 | blt 3f | |
| 193 | lwzu r0,-4(r4) | |
| 194 | subi r5,r5,4 | |
| 195 | stwu r0,-4(r6) | |
| 196 | 3: cmpwi 0,r5,0 | |
| 197 | beqlr | |
| 198 | mtctr r5 | |
| 199 | 4: lbzu r0,-1(r4) | |
| 200 | stbu r0,-1(r6) | |
| 201 | bdnz 4b | |
| 202 | blr | |
| b4e7de0f PM |
203 | 5: cmpw cr1,r0,r5 |
| 204 | subf r7,r0,r4 | |
| 205 | andi. r7,r7,3 | |
| 206 | ble cr1,3b | |
| 207 | bne 3b | |
| 208 | mtctr r0 | |
| 1da177e4 LT |
209 | 6: lbzu r7,-1(r4) |
| 210 | stbu r7,-1(r6) | |
| 211 | bdnz 6b | |
| 212 | subf r5,r0,r5 | |
| 213 | rlwinm. r7,r5,32-3,3,31 | |
| 214 | beq 2b | |
| 215 | mtctr r7 | |
| 216 | b 1b | |
| 217 | ||
| 9b4b8feb DG |
218 | .globl memchr |
| 219 | memchr: | |
| 220 | cmpwi 0,r5,0 | |
| 221 | blelr | |
| 222 | mtctr r5 | |
| 223 | addi r3,r3,-1 | |
| 224 | 1: lbzu r0,1(r3) | |
| 225 | cmpw r0,r4 | |
| 226 | beqlr | |
| 227 | bdnz 1b | |
| 228 | li r3,0 | |
| 229 | blr | |
| 230 | ||
| 1da177e4 LT |
231 | .globl memcmp |
| 232 | memcmp: | |
| 233 | cmpwi 0,r5,0 | |
| 59fd6b8c | 234 | ble 2f |
| 1da177e4 LT |
235 | mtctr r5 |
| 236 | addi r6,r3,-1 | |
| 237 | addi r4,r4,-1 | |
| 238 | 1: lbzu r3,1(r6) | |
| 239 | lbzu r0,1(r4) | |
| 240 | subf. r3,r0,r3 | |
| 241 | bdnzt 2,1b | |
| 242 | blr | |
| 59fd6b8c MD |
243 | 2: li r3,0 |
| 244 | blr | |
| 1da177e4 LT |
245 | |
| 246 | ||
| 247 | /* | |
| 248 | * Flush the dcache and invalidate the icache for a range of addresses. | |
| 249 | * | |
| 250 | * flush_cache(addr, len) | |
| 251 | */ | |
| 252 | .global flush_cache | |
| 253 | flush_cache: | |
| 254 | addi 4,4,0x1f /* len = (len + 0x1f) / 0x20 */ | |
| 255 | rlwinm. 4,4,27,5,31 | |
| 256 | mtctr 4 | |
| 257 | beqlr | |
| 258 | 1: dcbf 0,3 | |
| 259 | icbi 0,3 | |
| 260 | addi 3,3,0x20 | |
| 261 | bdnz 1b | |
| 262 | sync | |
| 263 | isync | |
| 264 | blr | |
| 265 |