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unix: add SyscallNoError and RawSyscallNoError on Linux

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Add the SyscallNoError and RawSyscallNoError wrapper functions which are
used for syscalls that don't return an error. Also convert all applicable
syscalls to use these wrappers.

Updates golang/go#22924

Change-Id: Ie143abc99de8d12d36b67ac278e08d7565f73ce0
Reviewed-on: https://go-review.googlesource.com/85756
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tobias Klauser
2018-01-03 16:03:02 +00:00
committed by Brad Fitzpatrick
parent 83801418e1
commit 28a7276518
21 changed files with 370 additions and 130 deletions
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unix/asm_linux_amd64.s
+29 -1
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@@ -13,17 +13,45 @@
// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.
TEXT ·Syscall(SB),NOSPLIT,$0-56
TEXT ·Syscall(SB),NOSPLIT,$0-56
JMP syscall·Syscall(SB)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
JMP syscall·Syscall6(SB)
TEXT ·SyscallNoError(SB),NOSPLIT,$0-48
CALL runtime·entersyscall(SB)
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ DX, r2+40(FP)
CALL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
JMP syscall·RawSyscall(SB)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
JMP syscall·RawSyscall6(SB)
TEXT ·RawSyscallNoError(SB),NOSPLIT,$0-48
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ DX, r2+40(FP)
RET
TEXT ·gettimeofday(SB),NOSPLIT,$0-16
JMP syscall·gettimeofday(SB)