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 #define DMB_ISH_7 \ 8 MOVB runtimegoarm(SB), R11; \ 9 CMP $7, R11; \ 10 BLT 2(PC); \ 11 WORD $0xf57ff05b // dmb ish 12 13 // Plan9/ARM atomic operations. 14 // TODO(minux): this only supports ARMv6K or higher. 15 16 TEXT CompareAndSwapInt32(SB),NOSPLIT,$0 17 B CompareAndSwapUint32(SB) 18 19 TEXT CompareAndSwapUint32(SB),NOSPLIT,$0 20 B armCompareAndSwapUint32(SB) 21 22 TEXT CompareAndSwapUintptr(SB),NOSPLIT,$0 23 B CompareAndSwapUint32(SB) 24 25 TEXT AddInt32(SB),NOSPLIT,$0 26 B AddUint32(SB) 27 28 TEXT AddUint32(SB),NOSPLIT,$0 29 B armAddUint32(SB) 30 31 TEXT AddUintptr(SB),NOSPLIT,$0 32 B AddUint32(SB) 33 34 TEXT SwapInt32(SB),NOSPLIT,$0 35 B SwapUint32(SB) 36 37 TEXT SwapUint32(SB),NOSPLIT,$0 38 B armSwapUint32(SB) 39 40 TEXT SwapUintptr(SB),NOSPLIT,$0 41 B SwapUint32(SB) 42 43 TEXT CompareAndSwapInt64(SB),NOSPLIT,$0 44 B CompareAndSwapUint64(SB) 45 46 TEXT CompareAndSwapUint64(SB),NOSPLIT,$-4 47 B armCompareAndSwapUint64(SB) 48 49 TEXT AddInt64(SB),NOSPLIT,$0 50 B addUint64(SB) 51 52 TEXT AddUint64(SB),NOSPLIT,$0 53 B addUint64(SB) 54 55 TEXT SwapInt64(SB),NOSPLIT,$0 56 B swapUint64(SB) 57 58 TEXT SwapUint64(SB),NOSPLIT,$0 59 B swapUint64(SB) 60 61 TEXT LoadInt32(SB),NOSPLIT,$0 62 B LoadUint32(SB) 63 64 TEXT LoadUint32(SB),NOSPLIT,$0-8 65 MOVW addr+0(FP), R1 66 load32loop: 67 LDREX (R1), R2 // loads R2 68 STREX R2, (R1), R0 // stores R2 69 CMP $0, R0 70 BNE load32loop 71 MOVW R2, val+4(FP) 72 DMB_ISH_7 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 DMB_ISH_7 94 storeloop: 95 LDREX (R1), R4 // loads R4 96 STREX R2, (R1), R0 // stores R2 97 CMP $0, R0 98 BNE storeloop 99 RET 100 101 TEXT StoreInt64(SB),NOSPLIT,$0 102 B storeUint64(SB) 103 104 TEXT StoreUint64(SB),NOSPLIT,$0 105 B storeUint64(SB) 106 107 TEXT StoreUintptr(SB),NOSPLIT,$0 108 B StoreUint32(SB) 109
