31 lines
880 B
ArmAsm
31 lines
880 B
ArmAsm
// Copyright 2016 The Netstack Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// blockingPoll makes the poll() syscall while calling the version of
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// entersyscall that relinquishes the P so that other Gs can run. This is meant
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// to be called in cases when the syscall is expected to block.
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//
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// func blockingPoll(fds unsafe.Pointer, nfds int, timeout int64) (n int, err syscall.Errno)
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TEXT ·blockingPoll(SB),NOSPLIT,$0-40
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CALL runtime·entersyscallblock(SB)
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MOVQ fds+0(FP), DI
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MOVQ nfds+8(FP), SI
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MOVQ timeout+16(FP), DX
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MOVQ $0x7, AX // SYS_POLL
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SYSCALL
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CMPQ AX, $0xfffffffffffff001
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JLS ok
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MOVQ $-1, n+24(FP)
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NEGQ AX
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MOVQ AX, err+32(FP)
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CALL runtime·exitsyscall(SB)
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RET
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ok:
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MOVQ AX, n+24(FP)
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MOVQ $0, err+32(FP)
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CALL runtime·exitsyscall(SB)
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RET
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