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memcpy_64.S
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2002 Paul Mackerras, IBM Corp.
*/
#include <asm/processor.h>
#include <asm/ppc_asm.h>
#include <asm/export.h>
#include <asm/asm-compat.h>
#include <asm/feature-fixups.h>
#include <asm/kasan.h>
#ifndef SELFTEST_CASE
/* For big-endian, 0 == most CPUs, 1 == POWER6, 2 == Cell */
#define SELFTEST_CASE 0
#endif
.align 7
_GLOBAL_TOC_KASAN(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
#ifdef CONFIG_PPC_BOOK3S_64
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. */
test_feature = (SELFTEST_CASE == 1)
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
test_feature = (SELFTEST_CASE == 0)
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)
EXPORT_SYMBOL_KASAN(memcpy)