| /* |
| * String handling functions for PowerPC. |
| * |
| * Copyright (C) 1996 Paul Mackerras. |
| * |
| * 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. |
| */ |
| #define r0 0 |
| #define r3 3 |
| #define r4 4 |
| #define r5 5 |
| #define r6 6 |
| #define r7 7 |
| #define r8 8 |
| |
| .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 /* r0 = r5 >> 3 */ |
| addi r6,r3,-4 |
| addi r4,r4,-4 |
| beq 2f /* if less than 8 bytes to do */ |
| andi. r0,r6,3 /* get dest word aligned */ |
| mtctr r7 |
| bne 5f |
| 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 |
| 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 /* r0 = r5 >> 3 */ |
| add r6,r3,r5 |
| add r4,r4,r5 |
| beq 2f |
| andi. r0,r6,3 |
| mtctr r7 |
| bne 5f |
| 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: 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 memcmp |
| memcmp: |
| cmpwi 0,r5,0 |
| blelr |
| 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 |
