mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 15:04:27 +08:00
224 lines
4.1 KiB
ArmAsm
224 lines
4.1 KiB
ArmAsm
/*
|
|
* Copyright (C) 2002 Paul Mackerras, IBM Corp.
|
|
*
|
|
* 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/ppc_asm.h>
|
|
#include <asm/export.h>
|
|
|
|
.align 7
|
|
_GLOBAL_TOC(memcpy)
|
|
BEGIN_FTR_SECTION
|
|
#ifdef __LITTLE_ENDIAN__
|
|
cmpdi cr7,r5,0
|
|
#else
|
|
std r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* save destination pointer for return value */
|
|
#endif
|
|
FTR_SECTION_ELSE
|
|
#ifndef SELFTEST
|
|
b memcpy_power7
|
|
#endif
|
|
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
|
|
#ifdef __LITTLE_ENDIAN__
|
|
/* dumb little-endian memcpy that will get replaced at runtime */
|
|
addi r9,r3,-1
|
|
addi r4,r4,-1
|
|
beqlr cr7
|
|
mtctr r5
|
|
1: lbzu r10,1(r4)
|
|
stbu r10,1(r9)
|
|
bdnz 1b
|
|
blr
|
|
#else
|
|
PPC_MTOCRF(0x01,r5)
|
|
cmpldi cr1,r5,16
|
|
neg r6,r3 # LS 3 bits = # bytes to 8-byte dest bdry
|
|
andi. r6,r6,7
|
|
dcbt 0,r4
|
|
blt cr1,.Lshort_copy
|
|
/* Below we want to nop out the bne if we're on a CPU that has the
|
|
CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit
|
|
cleared.
|
|
At the time of writing the only CPU that has this combination of bits
|
|
set is Power6. */
|
|
BEGIN_FTR_SECTION
|
|
nop
|
|
FTR_SECTION_ELSE
|
|
bne .Ldst_unaligned
|
|
ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \
|
|
CPU_FTR_UNALIGNED_LD_STD)
|
|
.Ldst_aligned:
|
|
addi r3,r3,-16
|
|
BEGIN_FTR_SECTION
|
|
andi. r0,r4,7
|
|
bne .Lsrc_unaligned
|
|
END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
|
|
srdi r7,r5,4
|
|
ld r9,0(r4)
|
|
addi r4,r4,-8
|
|
mtctr r7
|
|
andi. r5,r5,7
|
|
bf cr7*4+0,2f
|
|
addi r3,r3,8
|
|
addi r4,r4,8
|
|
mr r8,r9
|
|
blt cr1,3f
|
|
1: ld r9,8(r4)
|
|
std r8,8(r3)
|
|
2: ldu r8,16(r4)
|
|
stdu r9,16(r3)
|
|
bdnz 1b
|
|
3: std r8,8(r3)
|
|
beq 3f
|
|
addi r3,r3,16
|
|
.Ldo_tail:
|
|
bf cr7*4+1,1f
|
|
lwz r9,8(r4)
|
|
addi r4,r4,4
|
|
stw r9,0(r3)
|
|
addi r3,r3,4
|
|
1: bf cr7*4+2,2f
|
|
lhz r9,8(r4)
|
|
addi r4,r4,2
|
|
sth r9,0(r3)
|
|
addi r3,r3,2
|
|
2: bf cr7*4+3,3f
|
|
lbz r9,8(r4)
|
|
stb r9,0(r3)
|
|
3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
|
|
blr
|
|
|
|
.Lsrc_unaligned:
|
|
srdi r6,r5,3
|
|
addi r5,r5,-16
|
|
subf r4,r0,r4
|
|
srdi r7,r5,4
|
|
sldi r10,r0,3
|
|
cmpdi cr6,r6,3
|
|
andi. r5,r5,7
|
|
mtctr r7
|
|
subfic r11,r10,64
|
|
add r5,r5,r0
|
|
|
|
bt cr7*4+0,0f
|
|
|
|
ld r9,0(r4) # 3+2n loads, 2+2n stores
|
|
ld r0,8(r4)
|
|
sld r6,r9,r10
|
|
ldu r9,16(r4)
|
|
srd r7,r0,r11
|
|
sld r8,r0,r10
|
|
or r7,r7,r6
|
|
blt cr6,4f
|
|
ld r0,8(r4)
|
|
# s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12
|
|
b 2f
|
|
|
|
0: ld r0,0(r4) # 4+2n loads, 3+2n stores
|
|
ldu r9,8(r4)
|
|
sld r8,r0,r10
|
|
addi r3,r3,-8
|
|
blt cr6,5f
|
|
ld r0,8(r4)
|
|
srd r12,r9,r11
|
|
sld r6,r9,r10
|
|
ldu r9,16(r4)
|
|
or r12,r8,r12
|
|
srd r7,r0,r11
|
|
sld r8,r0,r10
|
|
addi r3,r3,16
|
|
beq cr6,3f
|
|
|
|
# d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9
|
|
1: or r7,r7,r6
|
|
ld r0,8(r4)
|
|
std r12,8(r3)
|
|
2: srd r12,r9,r11
|
|
sld r6,r9,r10
|
|
ldu r9,16(r4)
|
|
or r12,r8,r12
|
|
stdu r7,16(r3)
|
|
srd r7,r0,r11
|
|
sld r8,r0,r10
|
|
bdnz 1b
|
|
|
|
3: std r12,8(r3)
|
|
or r7,r7,r6
|
|
4: std r7,16(r3)
|
|
5: srd r12,r9,r11
|
|
or r12,r8,r12
|
|
std r12,24(r3)
|
|
beq 4f
|
|
cmpwi cr1,r5,8
|
|
addi r3,r3,32
|
|
sld r9,r9,r10
|
|
ble cr1,6f
|
|
ld r0,8(r4)
|
|
srd r7,r0,r11
|
|
or r9,r7,r9
|
|
6:
|
|
bf cr7*4+1,1f
|
|
rotldi r9,r9,32
|
|
stw r9,0(r3)
|
|
addi r3,r3,4
|
|
1: bf cr7*4+2,2f
|
|
rotldi r9,r9,16
|
|
sth r9,0(r3)
|
|
addi r3,r3,2
|
|
2: bf cr7*4+3,3f
|
|
rotldi r9,r9,8
|
|
stb r9,0(r3)
|
|
3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
|
|
blr
|
|
|
|
.Ldst_unaligned:
|
|
PPC_MTOCRF(0x01,r6) # put #bytes to 8B bdry into cr7
|
|
subf r5,r6,r5
|
|
li r7,0
|
|
cmpldi cr1,r5,16
|
|
bf cr7*4+3,1f
|
|
lbz r0,0(r4)
|
|
stb r0,0(r3)
|
|
addi r7,r7,1
|
|
1: bf cr7*4+2,2f
|
|
lhzx r0,r7,r4
|
|
sthx r0,r7,r3
|
|
addi r7,r7,2
|
|
2: bf cr7*4+1,3f
|
|
lwzx r0,r7,r4
|
|
stwx r0,r7,r3
|
|
3: PPC_MTOCRF(0x01,r5)
|
|
add r4,r6,r4
|
|
add r3,r6,r3
|
|
b .Ldst_aligned
|
|
|
|
.Lshort_copy:
|
|
bf cr7*4+0,1f
|
|
lwz r0,0(r4)
|
|
lwz r9,4(r4)
|
|
addi r4,r4,8
|
|
stw r0,0(r3)
|
|
stw r9,4(r3)
|
|
addi r3,r3,8
|
|
1: bf cr7*4+1,2f
|
|
lwz r0,0(r4)
|
|
addi r4,r4,4
|
|
stw r0,0(r3)
|
|
addi r3,r3,4
|
|
2: bf cr7*4+2,3f
|
|
lhz r0,0(r4)
|
|
addi r4,r4,2
|
|
sth r0,0(r3)
|
|
addi r3,r3,2
|
|
3: bf cr7*4+3,4f
|
|
lbz r0,0(r4)
|
|
stb r0,0(r3)
|
|
4: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
|
|
blr
|
|
#endif
|
|
EXPORT_SYMBOL(memcpy)
|