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   1 /*
   2  *  linux/arch/arm/lib/memcpy.S
   3  *
   4  *  Copyright (C) 1995-1999 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  ASM optimised string functions
  11  */
  12 #include <linux/linkage.h>
  13 #include <asm/assembler.h>
  14
  15                 .text
  16
  17 #define ENTER   \
  18                 mov     ip,sp   ;\
  19                 stmfd   sp!,{r0,r4-r9,fp,ip,lr,pc}      ;\
  20                 sub     fp,ip,#4
  21
  22 #define EXIT    \
  23                 LOADREGS(ea, fp, {r0, r4 - r9, fp, sp, pc})
  24
  25 #define EXITEQ  \
  26                 LOADREGS(eqea, fp, {r0, r4 - r9, fp, sp, pc})
  27
  28 /*
  29  * Prototype: void memcpy(void *to,const void *from,unsigned long n);
  30  */
  31 ENTRY(memcpy)
  32 ENTRY(memmove)
  33                 ENTER
  34                 cmp     r1, r0
  35                 bcc     23f
  36                 subs    r2, r2, #4
  37                 blt     6f
  38         PLD(    pld     [r1, #0]                )
  39                 ands    ip, r0, #3
  40                 bne     7f
  41                 ands    ip, r1, #3
  42                 bne     8f
  43
  44 1:              subs    r2, r2, #8
  45                 blt     5f
  46                 subs    r2, r2, #20
  47                 blt     4f
  48         PLD(    pld     [r1, #28]               )
  49         PLD(    subs    r2, r2, #64             )
  50         PLD(    blt     3f                      )
  51 2:      PLD(    pld     [r1, #60]               )
  52         PLD(    pld     [r1, #92]               )
  53                 ldmia   r1!, {r3 - r9, ip}
  54                 subs    r2, r2, #32
  55                 stmgeia r0!, {r3 - r9, ip}
  56                 ldmgeia r1!, {r3 - r9, ip}
  57                 subges  r2, r2, #32
  58                 stmia   r0!, {r3 - r9, ip}
  59                 bge     2b
  60 3:      PLD(    ldmia   r1!, {r3 - r9, ip}      )
  61         PLD(    adds    r2, r2, #32             )
  62         PLD(    stmgeia r0!, {r3 - r9, ip}      )
  63         PLD(    ldmgeia r1!, {r3 - r9, ip}      )
  64         PLD(    subges  r2, r2, #32             )
  65         PLD(    stmia   r0!, {r3 - r9, ip}      )
  66 4:              cmn     r2, #16
  67                 ldmgeia r1!, {r3 - r6}
  68                 subge   r2, r2, #16
  69                 stmgeia r0!, {r3 - r6}
  70                 adds    r2, r2, #20
  71                 ldmgeia r1!, {r3 - r5}
  72                 subge   r2, r2, #12
  73                 stmgeia r0!, {r3 - r5}
  74 5:              adds    r2, r2, #8
  75                 blt     6f
  76                 subs    r2, r2, #4
  77                 ldrlt   r3, [r1], #4
  78                 ldmgeia r1!, {r4, r5}
  79                 subge   r2, r2, #4
  80                 strlt   r3, [r0], #4
  81                 stmgeia r0!, {r4, r5}
  82
  83 6:              adds    r2, r2, #4
  84                 EXITEQ
  85                 cmp     r2, #2
  86                 ldrb    r3, [r1], #1
  87                 ldrgeb  r4, [r1], #1
  88                 ldrgtb  r5, [r1], #1
  89                 strb    r3, [r0], #1
  90                 strgeb  r4, [r0], #1
  91                 strgtb  r5, [r0], #1
  92                 EXIT
  93
  94 7:              rsb     ip, ip, #4
  95                 cmp     ip, #2
  96                 ldrb    r3, [r1], #1
  97                 ldrgeb  r4, [r1], #1
  98                 ldrgtb  r5, [r1], #1
  99                 strb    r3, [r0], #1
 100                 strgeb  r4, [r0], #1
 101                 strgtb  r5, [r0], #1
 102                 subs    r2, r2, ip
 103                 blt     6b
 104                 ands    ip, r1, #3
 105                 beq     1b
 106
 107 8:              bic     r1, r1, #3
 108                 ldr     r7, [r1], #4
 109                 cmp     ip, #2
 110                 bgt     18f
 111                 beq     13f
 112                 cmp     r2, #12
 113                 blt     11f
 114         PLD(    pld     [r1, #12]               )
 115                 sub     r2, r2, #12
 116         PLD(    subs    r2, r2, #32             )
 117         PLD(    blt     10f                     )
 118         PLD(    pld     [r1, #28]               )
 119 9:      PLD(    pld     [r1, #44]               )
 120 10:             mov     r3, r7, pull #8
 121                 ldmia   r1!, {r4 - r7}
 122                 subs    r2, r2, #16
 123                 orr     r3, r3, r4, push #24
 124                 mov     r4, r4, pull #8
 125                 orr     r4, r4, r5, push #24
 126                 mov     r5, r5, pull #8
 127                 orr     r5, r5, r6, push #24
 128                 mov     r6, r6, pull #8
 129                 orr     r6, r6, r7, push #24
 130                 stmia   r0!, {r3 - r6}
 131                 bge     9b
 132         PLD(    cmn     r2, #32                 )
 133         PLD(    bge     10b                     )
 134         PLD(    add     r2, r2, #32             )
 135                 adds    r2, r2, #12
 136                 blt     12f
 137 11:             mov     r3, r7, pull #8
 138                 ldr     r7, [r1], #4
 139                 subs    r2, r2, #4
 140                 orr     r3, r3, r7, push #24
 141                 str     r3, [r0], #4
 142                 bge     11b
 143 12:             sub     r1, r1, #3
 144                 b       6b
 145
 146 13:             cmp     r2, #12
 147                 blt     16f
 148         PLD(    pld     [r1, #12]               )
 149                 sub     r2, r2, #12
 150         PLD(    subs    r2, r2, #32             )
 151         PLD(    blt     15f                     )
 152         PLD(    pld     [r1, #28]               )
 153 14:     PLD(    pld     [r1, #44]               )
 154 15:             mov     r3, r7, pull #16
 155                 ldmia   r1!, {r4 - r7}
 156                 subs    r2, r2, #16
 157                 orr     r3, r3, r4, push #16
 158                 mov     r4, r4, pull #16
 159                 orr     r4, r4, r5, push #16
 160                 mov     r5, r5, pull #16
 161                 orr     r5, r5, r6, push #16
 162                 mov     r6, r6, pull #16
 163                 orr     r6, r6, r7, push #16
 164                 stmia   r0!, {r3 - r6}
 165                 bge     14b
 166         PLD(    cmn     r2, #32                 )
 167         PLD(    bge     15b                     )
 168         PLD(    add     r2, r2, #32             )
 169                 adds    r2, r2, #12
 170                 blt     17f
 171 16:             mov     r3, r7, pull #16
 172                 ldr     r7, [r1], #4
 173                 subs    r2, r2, #4
 174                 orr     r3, r3, r7, push #16
 175                 str     r3, [r0], #4
 176                 bge     16b
 177 17:             sub     r1, r1, #2
 178                 b       6b
 179
 180 18:             cmp     r2, #12
 181                 blt     21f
 182         PLD(    pld     [r1, #12]               )
 183                 sub     r2, r2, #12
 184         PLD(    subs    r2, r2, #32             )
 185         PLD(    blt     20f                     )
 186         PLD(    pld     [r1, #28]               )
 187 19:     PLD(    pld     [r1, #44]               )
 188 20:             mov     r3, r7, pull #24
 189                 ldmia   r1!, {r4 - r7}
 190                 subs    r2, r2, #16
 191                 orr     r3, r3, r4, push #8
 192                 mov     r4, r4, pull #24
 193                 orr     r4, r4, r5, push #8
 194                 mov     r5, r5, pull #24
 195                 orr     r5, r5, r6, push #8
 196                 mov     r6, r6, pull #24
 197                 orr     r6, r6, r7, push #8
 198                 stmia   r0!, {r3 - r6}
 199                 bge     19b
 200         PLD(    cmn     r2, #32                 )
 201         PLD(    bge     20b                     )
 202         PLD(    add     r2, r2, #32             )
 203                 adds    r2, r2, #12
 204                 blt     22f
 205 21:             mov     r3, r7, pull #24
 206                 ldr     r7, [r1], #4
 207                 subs    r2, r2, #4
 208                 orr     r3, r3, r7, push #8
 209                 str     r3, [r0], #4
 210                 bge     21b
 211 22:             sub     r1, r1, #1
 212                 b       6b
 213
 214
 215 23:             add     r1, r1, r2
 216                 add     r0, r0, r2
 217                 subs    r2, r2, #4
 218                 blt     29f
 219         PLD(    pld     [r1, #-4]               )
 220                 ands    ip, r0, #3
 221                 bne     30f
 222                 ands    ip, r1, #3
 223                 bne     31f
 224
 225 24:             subs    r2, r2, #8
 226                 blt     28f
 227                 subs    r2, r2, #20
 228                 blt     27f
 229         PLD(    pld     [r1, #-32]              )
 230         PLD(    subs    r2, r2, #64             )
 231         PLD(    blt     26f                     )
 232 25:     PLD(    pld     [r1, #-64]              )
 233         PLD(    pld     [r1, #-96]              )
 234                 ldmdb   r1!, {r3 - r9, ip}
 235                 subs    r2, r2, #32
 236                 stmgedb r0!, {r3 - r9, ip}
 237                 ldmgedb r1!, {r3 - r9, ip}
 238                 subges  r2, r2, #32
 239                 stmdb   r0!, {r3 - r9, ip}
 240                 bge     25b
 241 26:     PLD(    ldmdb   r1!, {r3 - r9, ip}      )
 242         PLD(    adds    r2, r2, #32             )
 243         PLD(    stmgedb r0!, {r3 - r9, ip}      )
 244         PLD(    ldmgedb r1!, {r3 - r9, ip}      )
 245         PLD(    subges  r2, r2, #32             )
 246         PLD(    stmdb   r0!, {r3 - r9, ip}      )
 247 27:             cmn     r2, #16
 248                 ldmgedb r1!, {r3 - r6}
 249                 subge   r2, r2, #16
 250                 stmgedb r0!, {r3 - r6}
 251                 adds    r2, r2, #20
 252                 ldmgedb r1!, {r3 - r5}
 253                 subge   r2, r2, #12
 254                 stmgedb r0!, {r3 - r5}
 255 28:             adds    r2, r2, #8
 256                 blt     29f
 257                 subs    r2, r2, #4
 258                 ldrlt   r3, [r1, #-4]!
 259                 ldmgedb r1!, {r4, r5}
 260                 subge   r2, r2, #4
 261                 strlt   r3, [r0, #-4]!
 262                 stmgedb r0!, {r4, r5}
 263
 264 29:             adds    r2, r2, #4
 265                 EXITEQ
 266                 cmp     r2, #2
 267                 ldrb    r3, [r1, #-1]!
 268                 ldrgeb  r4, [r1, #-1]!
 269                 ldrgtb  r5, [r1, #-1]!
 270                 strb    r3, [r0, #-1]!
 271                 strgeb  r4, [r0, #-1]!
 272                 strgtb  r5, [r0, #-1]!
 273                 EXIT
 274
 275 30:             cmp     ip, #2
 276                 ldrb    r3, [r1, #-1]!
 277                 ldrgeb  r4, [r1, #-1]!
 278                 ldrgtb  r5, [r1, #-1]!
 279                 strb    r3, [r0, #-1]!
 280                 strgeb  r4, [r0, #-1]!
 281                 strgtb  r5, [r0, #-1]!
 282                 subs    r2, r2, ip
 283                 blt     29b
 284                 ands    ip, r1, #3
 285                 beq     24b
 286
 287 31:             bic     r1, r1, #3
 288                 ldr     r3, [r1], #0
 289                 cmp     ip, #2
 290                 blt     41f
 291                 beq     36f
 292                 cmp     r2, #12
 293                 blt     34f
 294         PLD(    pld     [r1, #-16]              )
 295                 sub     r2, r2, #12
 296         PLD(    subs    r2, r2, #32             )
 297         PLD(    blt     33f                     )
 298         PLD(    pld     [r1, #-32]              )
 299 32:     PLD(    pld     [r1, #-48]              )
 300 33:             mov     r7, r3, push #8
 301                 ldmdb   r1!, {r3, r4, r5, r6}
 302                 subs    r2, r2, #16
 303                 orr     r7, r7, r6, pull #24
 304                 mov     r6, r6, push #8
 305                 orr     r6, r6, r5, pull #24
 306                 mov     r5, r5, push #8
 307                 orr     r5, r5, r4, pull #24
 308                 mov     r4, r4, push #8
 309                 orr     r4, r4, r3, pull #24
 310                 stmdb   r0!, {r4, r5, r6, r7}
 311                 bge     32b
 312         PLD(    cmn     r2, #32                 )
 313         PLD(    bge     33b                     )
 314         PLD(    add     r2, r2, #32             )
 315                 adds    r2, r2, #12
 316                 blt     35f
 317 34:             mov     ip, r3, push #8
 318                 ldr     r3, [r1, #-4]!
 319                 subs    r2, r2, #4
 320                 orr     ip, ip, r3, pull #24
 321                 str     ip, [r0, #-4]!
 322                 bge     34b
 323 35:             add     r1, r1, #3
 324                 b       29b
 325
 326 36:             cmp     r2, #12
 327                 blt     39f
 328         PLD(    pld     [r1, #-16]              )
 329                 sub     r2, r2, #12
 330         PLD(    subs    r2, r2, #32             )
 331         PLD(    blt     38f                     )
 332         PLD(    pld     [r1, #-32]              )
 333 37:     PLD(    pld     [r1, #-48]              )
 334 38:             mov     r7, r3, push #16
 335                 ldmdb   r1!, {r3, r4, r5, r6}
 336                 subs    r2, r2, #16
 337                 orr     r7, r7, r6, pull #16
 338                 mov     r6, r6, push #16
 339                 orr     r6, r6, r5, pull #16
 340                 mov     r5, r5, push #16
 341                 orr     r5, r5, r4, pull #16
 342                 mov     r4, r4, push #16
 343                 orr     r4, r4, r3, pull #16
 344                 stmdb   r0!, {r4, r5, r6, r7}
 345                 bge     37b
 346         PLD(    cmn     r2, #32                 )
 347         PLD(    bge     38b                     )
 348         PLD(    add     r2, r2, #32             )
 349                 adds    r2, r2, #12
 350                 blt     40f
 351 39:             mov     ip, r3, push #16
 352                 ldr     r3, [r1, #-4]!
 353                 subs    r2, r2, #4
 354                 orr     ip, ip, r3, pull #16
 355                 str     ip, [r0, #-4]!
 356                 bge     39b
 357 40:             add     r1, r1, #2
 358                 b       29b
 359
 360 41:             cmp     r2, #12
 361                 blt     44f
 362         PLD(    pld     [r1, #-16]              )
 363                 sub     r2, r2, #12
 364         PLD(    subs    r2, r2, #32             )
 365         PLD(    blt     43f                     )
 366         PLD(    pld     [r1, #-32]              )
 367 42:     PLD(    pld     [r1, #-48]              )
 368 43:             mov     r7, r3, push #24
 369                 ldmdb   r1!, {r3, r4, r5, r6}
 370                 subs    r2, r2, #16
 371                 orr     r7, r7, r6, pull #8
 372                 mov     r6, r6, push #24
 373                 orr     r6, r6, r5, pull #8
 374                 mov     r5, r5, push #24
 375                 orr     r5, r5, r4, pull #8
 376                 mov     r4, r4, push #24
 377                 orr     r4, r4, r3, pull #8
 378                 stmdb   r0!, {r4, r5, r6, r7}
 379                 bge     42b
 380         PLD(    cmn     r2, #32                 )
 381         PLD(    bge     43b                     )
 382         PLD(    add     r2, r2, #32             )
 383                 adds    r2, r2, #12
 384                 blt     45f
 385 44:             mov     ip, r3, push #24
 386                 ldr     r3, [r1, #-4]!
 387                 subs    r2, r2, #4
 388                 orr     ip, ip, r3, pull #8
 389                 str     ip, [r0, #-4]!
 390                 bge     44b
 391 45:             add     r1, r1, #1
 392                 b       29b
 393