| /* |
| * 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 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 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 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 |
| |
| |
| /* |
| * 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 |
| |
