43 lines
1.3 KiB
ArmAsm
43 lines
1.3 KiB
ArmAsm
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "textflag.h"
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// BlockingPoll makes the ppoll() 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 *PollEvent, nfds int, timeout *syscall.Timespec) (n int, err syscall.Errno)
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TEXT ·BlockingPoll(SB),NOSPLIT,$0-40
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BL ·callEntersyscallblock(SB)
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MOVD fds+0(FP), R0
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MOVD nfds+8(FP), R1
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MOVD timeout+16(FP), R2
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MOVD $0x0, R3 // sigmask parameter which isn't used here
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MOVD $0x49, R8 // SYS_PPOLL
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SVC
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CMP $0xfffffffffffff001, R0
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BLS ok
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MOVD $-1, R1
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MOVD R1, n+24(FP)
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NEG R0, R0
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MOVD R0, err+32(FP)
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BL ·callExitsyscall(SB)
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RET
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ok:
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MOVD R0, n+24(FP)
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MOVD $0, err+32(FP)
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BL ·callExitsyscall(SB)
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RET
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