sync/atomic: added support for mips64{,le}

Change-Id: Ibe6c345afd4cbae7e2542a350043fbb6b81d5678
Reviewed-on: https://go-review.googlesource.com/14450Reviewed-by: Minux Ma <minux@golang.org>

src/sync/atomic/asm_mips64x.s

+// Copyright 2015 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.
+
+// +build mips64 mips64le
+
+#include "textflag.h"
+
+#define LL(base, rt)	WORD	$((060<<26)|((base)<<21)|((rt)<<16))
+#define LLV(base, rt)	WORD	$((064<<26)|((base)<<21)|((rt)<<16))
+#define SC(base, rt)	WORD	$((070<<26)|((base)<<21)|((rt)<<16))
+#define SCV(base, rt)	WORD	$((074<<26)|((base)<<21)|((rt)<<16))
+#define SYNC	WORD $0xf
+
+TEXT ·SwapInt32(SB),NOSPLIT,$0-20
+	JMP	·SwapUint32(SB)
+
+TEXT ·SwapUint32(SB),NOSPLIT,$0-20
+	MOVV	addr+0(FP), R2
+	MOVW	new+8(FP), R5
+	SYNC
+	MOVV	R5, R3
+	LL(2, 1)	// R1 = *R2
+	SC(2, 3)	// *R2 = R3
+	BEQ	R3, -3(PC)
+	MOVW	R1, old+16(FP)
+	SYNC
+	RET
+
+TEXT ·SwapInt64(SB),NOSPLIT,$0-24
+	JMP	·SwapUint64(SB)
+
+TEXT ·SwapUint64(SB),NOSPLIT,$0-24
+	MOVV	addr+0(FP), R2
+	MOVV	new+8(FP), R5
+	SYNC
+	MOVV	R5, R3
+	LLV(2, 1)	// R1 = *R2
+	SCV(2, 3)	// *R2 = R3
+	BEQ	R3, -3(PC)
+	MOVV	R1, old+16(FP)
+	SYNC
+	RET
+
+TEXT ·SwapUintptr(SB),NOSPLIT,$0-24
+	JMP	·SwapUint64(SB)
+
+TEXT ·CompareAndSwapInt32(SB),NOSPLIT,$0-17
+	JMP	·CompareAndSwapUint32(SB)
+
+TEXT ·CompareAndSwapUint32(SB),NOSPLIT,$0-17
+	MOVV	addr+0(FP), R1
+	MOVW	old+8(FP), R2
+	MOVW	new+12(FP), R5
+	SYNC
+cas_again:
+	MOVV	R5, R3
+	LL(1, 4)	// R4 = *R1
+	BNE	R2, R4, cas_fail
+	SC(1, 3)	// *R1 = R3
+	BEQ	R3, cas_again
+	MOVV	$1, R1
+	MOVB	R1, swapped+16(FP)
+	SYNC
+	RET
+cas_fail:
+	MOVV	$0, R1
+	JMP	-4(PC)
+
+TEXT ·CompareAndSwapUintptr(SB),NOSPLIT,$0-25
+	JMP	·CompareAndSwapUint64(SB)
+
+TEXT ·CompareAndSwapInt64(SB),NOSPLIT,$0-25
+	JMP	·CompareAndSwapUint64(SB)
+
+TEXT ·CompareAndSwapUint64(SB),NOSPLIT,$0-25
+	MOVV	addr+0(FP), R1
+	MOVV	old+8(FP), R2
+	MOVV	new+16(FP), R5
+	SYNC
+cas64_again:
+	MOVV	R5, R3
+	LLV(1, 4)	// R4 = *R1
+	BNE	R2, R4, cas64_fail
+	SCV(1, 3)	// *R1 = R3
+	BEQ	R3, cas64_again
+	MOVV	$1, R1
+	MOVB	R1, swapped+24(FP)
+	SYNC
+	RET
+cas64_fail:
+	MOVV	$0, R1
+	JMP	-4(PC)
+
+TEXT ·AddInt32(SB),NOSPLIT,$0-20
+	JMP	·AddUint32(SB)
+
+TEXT ·AddUint32(SB),NOSPLIT,$0-20
+	MOVV	addr+0(FP), R2
+	MOVW	delta+8(FP), R3
+	SYNC
+	LL(2, 1)	// R1 = *R2
+	ADDU	R1, R3, R4
+	MOVV	R4, R1
+	SC(2, 4)	// *R2 = R4
+	BEQ	R4, -4(PC)
+	MOVW	R1, ret+16(FP)
+	SYNC
+	RET
+
+TEXT ·AddUintptr(SB),NOSPLIT,$0-24
+	JMP	·AddUint64(SB)
+
+TEXT ·AddInt64(SB),NOSPLIT,$0-24
+	JMP	·AddUint64(SB)
+
+TEXT ·AddUint64(SB),NOSPLIT,$0-24
+	MOVV	addr+0(FP), R2
+	MOVV	delta+8(FP), R3
+	SYNC
+	LLV(2, 1)	// R1 = *R2
+	ADDVU	R1, R3, R4
+	MOVV	R4, R1
+	SCV(2, 4)	// *R2 = R4
+	BEQ	R4, -4(PC)
+	MOVV	R1, ret+16(FP)
+	SYNC
+	RET
+
+TEXT ·LoadInt32(SB),NOSPLIT,$0-12
+	JMP	·LoadUint32(SB)
+
+TEXT ·LoadUint32(SB),NOSPLIT,$0-12
+	MOVV	addr+0(FP), R1
+	SYNC
+	MOVWU	0(R1), R1
+	SYNC
+	MOVW	R1, val+8(FP)
+	RET
+
+TEXT ·LoadInt64(SB),NOSPLIT,$0-16
+	JMP	·LoadUint64(SB)
+
+TEXT ·LoadUint64(SB),NOSPLIT,$0-16
+	MOVV	addr+0(FP), R1
+	SYNC
+	MOVV	0(R1), R1
+	SYNC
+	MOVV	R1, val+8(FP)
+	RET
+
+TEXT ·LoadUintptr(SB),NOSPLIT,$0-16
+	JMP	·LoadPointer(SB)
+
+TEXT ·LoadPointer(SB),NOSPLIT,$0-16
+	JMP	·LoadUint64(SB)
+
+TEXT ·StoreInt32(SB),NOSPLIT,$0-12
+	JMP	·StoreUint32(SB)
+
+TEXT ·StoreUint32(SB),NOSPLIT,$0-12
+	MOVV	addr+0(FP), R1
+	MOVW	val+8(FP), R2
+	SYNC
+	MOVW	R2, 0(R1)
+	SYNC
+	RET
+
+TEXT ·StoreInt64(SB),NOSPLIT,$0-16
+	JMP	·StoreUint64(SB)
+
+TEXT ·StoreUint64(SB),NOSPLIT,$0-16
+	MOVV	addr+0(FP), R1
+	MOVV	val+8(FP), R2
+	SYNC
+	MOVV	R2, 0(R1)
+	SYNC
+	RET
+
+TEXT ·StoreUintptr(SB),NOSPLIT,$0-16
+	JMP	·StoreUint64(SB)