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bca17d16ca
Implement CLONE_INTO_CGROUP feature, allowing to put a child in a specified cgroup in a clean and simple way. Note that the feature only works for cgroup v2, and requires Linux kernel 5.7 or newer. Using the feature requires a new syscall, clone3. Currently this is the only reason to use clone3, but the code is structured in a way so that other cases may be easily added in the future. Add a test case. While at it, try to simplify the syscall calling code in forkAndExecInChild1, which became complicated over time because: 1. It was using either rawVforkSyscall or RawSyscall6 depending on whether CLONE_NEWUSER was set. 2. On Linux/s390, the first two arguments to clone(2) system call are swapped (which deserved a mention in Linux ABI hall of shame). It was worked around in rawVforkSyscall on s390, but had to be implemented via a switch/case when using RawSyscall6, making the code less clear. Let's - modify rawVforkSyscall to have two arguments (which is also required for clone3); - remove the arguments workaround from s390 asm, instead implementing arguments swap in the caller (which still looks ugly but at least it's done once and is clearly documented now); - use rawVforkSyscall for all cases (since it is essentially similar to RawSyscall6, except for having less parameters, not returning r2, and saving/restoring the return address before/after syscall on 386 and amd64). Updates #51246. Change-Id: Ifcd418ebead9257177338ffbcccd0bdecb94474e Reviewed-on: https://go-review.googlesource.com/c/go/+/417695 Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com> Run-TryBot: Kirill Kolyshkin <kolyshkin@gmail.com> TryBot-Result: Gopher Robot <gobot@golang.org>
45 lines
903 B
ArmAsm
45 lines
903 B
ArmAsm
// Copyright 2014 The Go 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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//go:build linux && (mips64 || mips64le)
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#include "textflag.h"
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//
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// System calls for mips64, Linux
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//
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// func rawVforkSyscall(trap, a1, a2 uintptr) (r1, err uintptr)
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TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-40
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MOVV a1+8(FP), R4
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MOVV a2+16(FP), R5
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MOVV R0, R6
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MOVV R0, R7
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MOVV R0, R8
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MOVV R0, R9
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MOVV trap+0(FP), R2 // syscall entry
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SYSCALL
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BEQ R7, ok
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MOVV $-1, R1
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MOVV R1, r1+24(FP) // r1
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MOVV R2, err+32(FP) // errno
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RET
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ok:
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MOVV R2, r1+24(FP) // r1
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MOVV R0, err+32(FP) // errno
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RET
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TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
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MOVV a1+8(FP), R4
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MOVV a2+16(FP), R5
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MOVV a3+24(FP), R6
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MOVV R0, R7
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MOVV R0, R8
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MOVV R0, R9
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MOVV trap+0(FP), R2 // syscall entry
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SYSCALL
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MOVV R2, r1+32(FP)
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MOVV R3, r2+40(FP)
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RET
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