root/src/pkg/sync/atomic/asm_freebsd_arm.s

// Copyright 2012 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.

#include "../../../cmd/ld/textflag.h"

// FreeBSD/ARM atomic operations.
// TODO(minux): this only supports ARMv6K or higher.

TEXT ﾂｷCompareAndSwapInt32(SB),NOSPLIT,$0
        B ﾂｷCompareAndSwapUint32(SB)

TEXT ﾂｷCompareAndSwapUint32(SB),NOSPLIT,$0
        B ﾂｷarmCompareAndSwapUint32(SB)

TEXT ﾂｷCompareAndSwapUintptr(SB),NOSPLIT,$0
        B ﾂｷCompareAndSwapUint32(SB)

TEXT ﾂｷCompareAndSwapPointer(SB),NOSPLIT,$0
        B ﾂｷCompareAndSwapUint32(SB)

TEXT ﾂｷAddInt32(SB),NOSPLIT,$0
        B ﾂｷAddUint32(SB)

TEXT ﾂｷAddUint32(SB),NOSPLIT,$0
        B ﾂｷarmAddUint32(SB)

TEXT ﾂｷAddUintptr(SB),NOSPLIT,$0
        B ﾂｷAddUint32(SB)

TEXT ﾂｷSwapInt32(SB),NOSPLIT,$0
        B ﾂｷSwapUint32(SB)

TEXT ﾂｷSwapUint32(SB),NOSPLIT,$0
        B ﾂｷarmSwapUint32(SB)

TEXT ﾂｷSwapUintptr(SB),NOSPLIT,$0
        B ﾂｷSwapUint32(SB)

TEXT ﾂｷSwapPointer(SB),NOSPLIT,$0
        B ﾂｷSwapUint32(SB)

TEXT ﾂｷCompareAndSwapInt64(SB),NOSPLIT,$0
        B ﾂｷCompareAndSwapUint64(SB)

TEXT ﾂｷCompareAndSwapUint64(SB),NOSPLIT,$-4
        B ﾂｷarmCompareAndSwapUint64(SB)

TEXT ﾂｷAddInt64(SB),NOSPLIT,$0
        B ﾂｷaddUint64(SB)

TEXT ﾂｷAddUint64(SB),NOSPLIT,$0
        B ﾂｷaddUint64(SB)

TEXT ﾂｷSwapInt64(SB),NOSPLIT,$0
        B ﾂｷswapUint64(SB)

TEXT ﾂｷSwapUint64(SB),NOSPLIT,$0
        B ﾂｷswapUint64(SB)

TEXT ﾂｷLoadInt32(SB),NOSPLIT,$0
        B ﾂｷLoadUint32(SB)

TEXT ﾂｷLoadUint32(SB),NOSPLIT,$0-8
        MOVW addr+0(FP), R1
load32loop:
        LDREX (R1), R2          // loads R2
        STREX R2, (R1), R0      // stores R2
        CMP $0, R0
        BNE load32loop
        MOVW R2, val+4(FP)
        RET

TEXT ﾂｷLoadInt64(SB),NOSPLIT,$0
        B ﾂｷloadUint64(SB)

TEXT ﾂｷLoadUint64(SB),NOSPLIT,$0
        B ﾂｷloadUint64(SB)

TEXT ﾂｷLoadUintptr(SB),NOSPLIT,$0
        B ﾂｷLoadUint32(SB)

TEXT ﾂｷLoadPointer(SB),NOSPLIT,$0
        B ﾂｷLoadUint32(SB)

TEXT ﾂｷStoreInt32(SB),NOSPLIT,$0
        B ﾂｷStoreUint32(SB)

TEXT ﾂｷStoreUint32(SB),NOSPLIT,$0-8
        MOVW addr+0(FP), R1
        MOVW val+4(FP), R2
storeloop:
        LDREX (R1), R4          // loads R4
        STREX R2, (R1), R0      // stores R2
        CMP $0, R0
        BNE storeloop
        RET

TEXT ﾂｷStoreInt64(SB),NOSPLIT,$0
        B ﾂｷstoreUint64(SB)

TEXT ﾂｷStoreUint64(SB),NOSPLIT,$0
        B ﾂｷstoreUint64(SB)

TEXT ﾂｷStoreUintptr(SB),NOSPLIT,$0
        B ﾂｷStoreUint32(SB)

TEXT ﾂｷStorePointer(SB),NOSPLIT,$0
        B ﾂｷStoreUint32(SB)