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Viewing File: atomic_mipsx.s
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build mips || mipsle
#include "textflag.h"
// bool Cas(int32 *val, int32 old, int32 new)
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
TEXT ·Cas(SB),NOSPLIT,$0-13
MOVW ptr+0(FP), R1
MOVW old+4(FP), R2
MOVW new+8(FP), R5
SYNC
try_cas:
MOVW R5, R3
LL (R1), R4 // R4 = *R1
BNE R2, R4, cas_fail
SC R3, (R1) // *R1 = R3
BEQ R3, try_cas
SYNC
MOVB R3, ret+12(FP)
RET
cas_fail:
SYNC
MOVB R0, ret+12(FP)
RET
TEXT ·Store(SB),NOSPLIT,$0-8
MOVW ptr+0(FP), R1
MOVW val+4(FP), R2
SYNC
MOVW R2, 0(R1)
SYNC
RET
TEXT ·Store8(SB),NOSPLIT,$0-5
MOVW ptr+0(FP), R1
MOVB val+4(FP), R2
SYNC
MOVB R2, 0(R1)
SYNC
RET
TEXT ·Load(SB),NOSPLIT,$0-8
MOVW ptr+0(FP), R1
SYNC
MOVW 0(R1), R1
SYNC
MOVW R1, ret+4(FP)
RET
TEXT ·Load8(SB),NOSPLIT,$0-5
MOVW ptr+0(FP), R1
SYNC
MOVB 0(R1), R1
SYNC
MOVB R1, ret+4(FP)
RET
// uint32 Xadd(uint32 volatile *val, int32 delta)
// Atomically:
// *val += delta;
// return *val;
TEXT ·Xadd(SB),NOSPLIT,$0-12
MOVW ptr+0(FP), R2
MOVW delta+4(FP), R3
SYNC
try_xadd:
LL (R2), R1 // R1 = *R2
ADDU R1, R3, R4
MOVW R4, R1
SC R4, (R2) // *R2 = R4
BEQ R4, try_xadd
SYNC
MOVW R1, ret+8(FP)
RET
// uint32 Xchg(ptr *uint32, new uint32)
// Atomically:
// old := *ptr;
// *ptr = new;
// return old;
TEXT ·Xchg(SB),NOSPLIT,$0-12
MOVW ptr+0(FP), R2
MOVW new+4(FP), R5
SYNC
try_xchg:
MOVW R5, R3
LL (R2), R1 // R1 = *R2
SC R3, (R2) // *R2 = R3
BEQ R3, try_xchg
SYNC
MOVW R1, ret+8(FP)
RET
TEXT ·Casint32(SB),NOSPLIT,$0-13
JMP ·Cas(SB)
TEXT ·Casint64(SB),NOSPLIT,$0-21
JMP ·Cas64(SB)
TEXT ·Casuintptr(SB),NOSPLIT,$0-13
JMP ·Cas(SB)
TEXT ·CasRel(SB),NOSPLIT,$0-13
JMP ·Cas(SB)
TEXT ·Loaduintptr(SB),NOSPLIT,$0-8
JMP ·Load(SB)
TEXT ·Loaduint(SB),NOSPLIT,$0-8
JMP ·Load(SB)
TEXT ·Loadp(SB),NOSPLIT,$-0-8
JMP ·Load(SB)
TEXT ·Storeint32(SB),NOSPLIT,$0-8
JMP ·Store(SB)
TEXT ·Storeint64(SB),NOSPLIT,$0-12
JMP ·Store64(SB)
TEXT ·Storeuintptr(SB),NOSPLIT,$0-8
JMP ·Store(SB)
TEXT ·Xadduintptr(SB),NOSPLIT,$0-12
JMP ·Xadd(SB)
TEXT ·Loadint32(SB),NOSPLIT,$0-8
JMP ·Load(SB)
TEXT ·Loadint64(SB),NOSPLIT,$0-12
JMP ·Load64(SB)
TEXT ·Xaddint32(SB),NOSPLIT,$0-12
JMP ·Xadd(SB)
TEXT ·Xaddint64(SB),NOSPLIT,$0-20
JMP ·Xadd64(SB)
TEXT ·Casp1(SB),NOSPLIT,$0-13
JMP ·Cas(SB)
TEXT ·Xchgint32(SB),NOSPLIT,$0-12
JMP ·Xchg(SB)
TEXT ·Xchgint64(SB),NOSPLIT,$0-20
JMP ·Xchg64(SB)
TEXT ·Xchguintptr(SB),NOSPLIT,$0-12
JMP ·Xchg(SB)
TEXT ·StorepNoWB(SB),NOSPLIT,$0-8
JMP ·Store(SB)
TEXT ·StoreRel(SB),NOSPLIT,$0-8
JMP ·Store(SB)
TEXT ·StoreReluintptr(SB),NOSPLIT,$0-8
JMP ·Store(SB)
// void Or8(byte volatile*, byte);
TEXT ·Or8(SB),NOSPLIT,$0-5
MOVW ptr+0(FP), R1
MOVBU val+4(FP), R2
MOVW $~3, R3 // Align ptr down to 4 bytes so we can use 32-bit load/store.
AND R1, R3
#ifdef GOARCH_mips
// Big endian. ptr = ptr ^ 3
XOR $3, R1
#endif
AND $3, R1, R4 // R4 = ((ptr & 3) * 8)
SLL $3, R4
SLL R4, R2, R2 // Shift val for aligned ptr. R2 = val << R4
SYNC
try_or8:
LL (R3), R4 // R4 = *R3
OR R2, R4
SC R4, (R3) // *R3 = R4
BEQ R4, try_or8
SYNC
RET
// void And8(byte volatile*, byte);
TEXT ·And8(SB),NOSPLIT,$0-5
MOVW ptr+0(FP), R1
MOVBU val+4(FP), R2
MOVW $~3, R3
AND R1, R3
#ifdef GOARCH_mips
// Big endian. ptr = ptr ^ 3
XOR $3, R1
#endif
AND $3, R1, R4 // R4 = ((ptr & 3) * 8)
SLL $3, R4
MOVW $0xFF, R5
SLL R4, R2
SLL R4, R5
NOR R0, R5
OR R5, R2 // Shift val for aligned ptr. R2 = val << R4 | ^(0xFF << R4)
SYNC
try_and8:
LL (R3), R4 // R4 = *R3
AND R2, R4
SC R4, (R3) // *R3 = R4
BEQ R4, try_and8
SYNC
RET
// func Or(addr *uint32, v uint32)
TEXT ·Or(SB), NOSPLIT, $0-8
MOVW ptr+0(FP), R1
MOVW val+4(FP), R2
SYNC
LL (R1), R3
OR R2, R3
SC R3, (R1)
BEQ R3, -4(PC)
SYNC
RET
// func And(addr *uint32, v uint32)
TEXT ·And(SB), NOSPLIT, $0-8
MOVW ptr+0(FP), R1
MOVW val+4(FP), R2
SYNC
LL (R1), R3
AND R2, R3
SC R3, (R1)
BEQ R3, -4(PC)
SYNC
RET
TEXT ·spinLock(SB),NOSPLIT,$0-4
MOVW state+0(FP), R1
MOVW $1, R2
SYNC
try_lock:
MOVW R2, R3
check_again:
LL (R1), R4
BNE R4, check_again
SC R3, (R1)
BEQ R3, try_lock
SYNC
RET
TEXT ·spinUnlock(SB),NOSPLIT,$0-4
MOVW state+0(FP), R1
SYNC
MOVW R0, (R1)
SYNC
RET
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