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* 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>
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
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
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
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)
cmplw 0,r3,r4
bgt backwards_memcpy
b 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
mtctr r5
4: lbzu r0,-1(r4)
stbu r0,-1(r6)
bdnz 4b
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