1 // Copyright 2012 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include "textflag.h" 6 7 // Darwin/ARM atomic operations. 8 9 #define DMB_ISHST_7 \ 10 WORD $0xf57ff05a // dmb ishst 11 12 #define DMB_ISH_7 \ 13 WORD $0xf57ff05b // dmb ish 14 15 TEXT CompareAndSwapInt32(SB),NOSPLIT,$0 16 B CompareAndSwapUint32(SB) 17 18 TEXT CompareAndSwapUint32(SB),NOSPLIT,$0 19 B armCompareAndSwapUint32(SB) 20 21 TEXT CompareAndSwapUintptr(SB),NOSPLIT,$0 22 B CompareAndSwapUint32(SB) 23 24 TEXT AddInt32(SB),NOSPLIT,$0 25 B AddUint32(SB) 26 27 TEXT AddUint32(SB),NOSPLIT,$0 28 B armAddUint32(SB) 29 30 TEXT AddUintptr(SB),NOSPLIT,$0 31 B AddUint32(SB) 32 33 TEXT SwapInt32(SB),NOSPLIT,$0 34 B SwapUint32(SB) 35 36 TEXT SwapUint32(SB),NOSPLIT,$0 37 B armSwapUint32(SB) 38 39 TEXT SwapUintptr(SB),NOSPLIT,$0 40 B SwapUint32(SB) 41 42 TEXT CompareAndSwapInt64(SB),NOSPLIT,$0 43 B CompareAndSwapUint64(SB) 44 45 TEXT CompareAndSwapUint64(SB),NOSPLIT,$-4 46 B armCompareAndSwapUint64(SB) 47 48 TEXT AddInt64(SB),NOSPLIT,$0 49 B addUint64(SB) 50 51 TEXT AddUint64(SB),NOSPLIT,$0 52 B addUint64(SB) 53 54 TEXT SwapInt64(SB),NOSPLIT,$0 55 B swapUint64(SB) 56 57 TEXT SwapUint64(SB),NOSPLIT,$0 58 B swapUint64(SB) 59 60 TEXT LoadInt32(SB),NOSPLIT,$0 61 B LoadUint32(SB) 62 63 TEXT LoadUint32(SB),NOSPLIT,$0-8 64 MOVW addr+0(FP), R1 65 load32loop: 66 LDREX (R1), R2 // loads R2 67 DMB_ISHST_7 68 STREX R2, (R1), R0 // stores R2 69 CMP $0, R0 70 BNE load32loop 71 DMB_ISH_7 72 MOVW R2, val+4(FP) 73 RET 74 75 TEXT LoadInt64(SB),NOSPLIT,$0 76 B loadUint64(SB) 77 78 TEXT LoadUint64(SB),NOSPLIT,$0 79 B loadUint64(SB) 80 81 TEXT LoadUintptr(SB),NOSPLIT,$0 82 B LoadUint32(SB) 83 84 TEXT LoadPointer(SB),NOSPLIT,$0 85 B LoadUint32(SB) 86 87 TEXT StoreInt32(SB),NOSPLIT,$0 88 B StoreUint32(SB) 89 90 TEXT StoreUint32(SB),NOSPLIT,$0-8 91 MOVW addr+0(FP), R1 92 MOVW val+4(FP), R2 93 storeloop: 94 LDREX (R1), R4 // loads R4 95 DMB_ISHST_7 96 STREX R2, (R1), R0 // stores R2 97 CMP $0, R0 98 BNE storeloop 99 DMB_ISH_7 100 RET 101 102 TEXT StoreInt64(SB),NOSPLIT,$0 103 B storeUint64(SB) 104 105 TEXT StoreUint64(SB),NOSPLIT,$0 106 B storeUint64(SB) 107 108 TEXT StoreUintptr(SB),NOSPLIT,$0 109 B StoreUint32(SB) 110
