151 lines
2.2 KiB
ArmAsm
151 lines
2.2 KiB
ArmAsm
/*
|
|
* 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
|