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Diffstat (limited to 'src/pkg/sync/atomic/asm_386.s')
| -rw-r--r-- | src/pkg/sync/atomic/asm_386.s | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/pkg/sync/atomic/asm_386.s b/src/pkg/sync/atomic/asm_386.s new file mode 100644 index 000000000..914d2feeb --- /dev/null +++ b/src/pkg/sync/atomic/asm_386.s @@ -0,0 +1,96 @@ +// Copyright 2011 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. + +TEXT ·CompareAndSwapInt32(SB),7,$0 + JMP ·CompareAndSwapUint32(SB) + +TEXT ·CompareAndSwapUint32(SB),7,$0 + MOVL valptr+0(FP), BP + MOVL old+4(FP), AX + MOVL new+8(FP), CX + // CMPXCHGL was introduced on the 486. + LOCK + CMPXCHGL CX, 0(BP) + SETEQ ret+12(FP) + RET + +TEXT ·CompareAndSwapUintptr(SB),7,$0 + JMP ·CompareAndSwapUint32(SB) + +TEXT ·CompareAndSwapInt64(SB),7,$0 + JMP ·CompareAndSwapUint64(SB) + +TEXT ·CompareAndSwapUint64(SB),7,$0 + MOVL valptr+0(FP), BP + MOVL oldlo+4(FP), AX + MOVL oldhi+8(FP), DX + MOVL newlo+12(FP), BX + MOVL newhi+16(FP), CX + // CMPXCHG8B was introduced on the Pentium. + LOCK + CMPXCHG8B 0(BP) + SETEQ ret+20(FP) + RET + +TEXT ·AddInt32(SB),7,$0 + JMP ·AddUint32(SB) + +TEXT ·AddUint32(SB),7,$0 + MOVL valptr+0(FP), BP + MOVL delta+4(FP), AX + MOVL AX, CX + // XADD was introduced on the 486. + LOCK + XADDL AX, 0(BP) + ADDL AX, CX + MOVL CX, ret+8(FP) + RET + +TEXT ·AddUintptr(SB),7,$0 + JMP ·AddUint32(SB) + +TEXT ·AddInt64(SB),7,$0 + JMP ·AddUint64(SB) + +TEXT ·AddUint64(SB),7,$0 + // no XADDQ so use CMPXCHG8B loop + MOVL valptr+0(FP), BP + // DI:SI = delta + MOVL deltalo+4(FP), SI + MOVL deltahi+8(FP), DI + // DX:AX = *valptr + MOVL 0(BP), AX + MOVL 4(BP), DX +addloop: + // CX:BX = DX:AX (*valptr) + DI:SI (delta) + MOVL AX, BX + MOVL DX, CX + ADDL SI, BX + ADCL DI, CX + + // if *valptr == DX:AX { + // *valptr = CX:BX + // } else { + // DX:AX = *valptr + // } + // all in one instruction + LOCK + CMPXCHG8B 0(BP) + + JNZ addloop + + // success + // return CX:BX + MOVL BX, retlo+12(FP) + MOVL CX, rethi+16(FP) + RET + +TEXT ·LoadInt32(SB),7,$0 + JMP ·LoadUint32(SB) + +TEXT ·LoadUint32(SB),7,$0 + MOVL addrptr+0(FP), AX + MOVL 0(AX), AX + MOVL AX, ret+4(FP) + RET |