/* | |
* 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. | |
*/ | |
#include <asm/processor.h> | |
#include <asm/errno.h> | |
#include <asm/ppc_asm.h> | |
_GLOBAL(memset) | |
neg r0,r3 | |
rlwimi r4,r4,8,16,23 | |
andi. r0,r0,7 /* # bytes to be 8-byte aligned */ | |
rlwimi r4,r4,16,0,15 | |
cmplw cr1,r5,r0 /* do we get that far? */ | |
rldimi r4,r4,32,0 | |
PPC_MTOCRF 1,r0 | |
mr r6,r3 | |
blt cr1,8f | |
beq+ 3f /* if already 8-byte aligned */ | |
subf r5,r0,r5 | |
bf 31,1f | |
stb r4,0(r6) | |
addi r6,r6,1 | |
1: bf 30,2f | |
sth r4,0(r6) | |
addi r6,r6,2 | |
2: bf 29,3f | |
stw r4,0(r6) | |
addi r6,r6,4 | |
3: srdi. r0,r5,6 | |
clrldi r5,r5,58 | |
mtctr r0 | |
beq 5f | |
4: std r4,0(r6) | |
std r4,8(r6) | |
std r4,16(r6) | |
std r4,24(r6) | |
std r4,32(r6) | |
std r4,40(r6) | |
std r4,48(r6) | |
std r4,56(r6) | |
addi r6,r6,64 | |
bdnz 4b | |
5: srwi. r0,r5,3 | |
clrlwi r5,r5,29 | |
PPC_MTOCRF 1,r0 | |
beq 8f | |
bf 29,6f | |
std r4,0(r6) | |
std r4,8(r6) | |
std r4,16(r6) | |
std r4,24(r6) | |
addi r6,r6,32 | |
6: bf 30,7f | |
std r4,0(r6) | |
std r4,8(r6) | |
addi r6,r6,16 | |
7: bf 31,8f | |
std r4,0(r6) | |
addi r6,r6,8 | |
8: cmpwi r5,0 | |
PPC_MTOCRF 1,r5 | |
beqlr+ | |
bf 29,9f | |
stw r4,0(r6) | |
addi r6,r6,4 | |
9: bf 30,10f | |
sth r4,0(r6) | |
addi r6,r6,2 | |
10: bflr 31 | |
stb r4,0(r6) | |
blr | |
_GLOBAL(memmove) | |
cmplw 0,r3,r4 | |
bgt .backwards_memcpy | |
b .memcpy | |
_GLOBAL(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 |