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path: root/src/syscall/asm_linux_ppc64x.s
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2023-09-07syscall: add support to get pidfd from ForkExec on LinuxKir Kolyshkin
Add PidFD support, so that if the PidFD pointer in SysProcAttr is not nil, ForkExec (and thus all its users) obtains a pidfd from the kernel during clone(), and writes the result (or -1, if the functionality is not supported by the kernel) into *PidFD. The functionality to get pidfd is implemented for both clone3 and clone. For the latter, an extra argument to rawVforkSyscall is needed, thus the change in asm files. Add a trivial test case checking the obtained pidfd can be used to send a signal to a process, using pidfd_send_signal. To test clone3 code path, add a flag available to tests only. Updates #51246. Change-Id: I2212b69e1a657163c31b4a6245b076bc495777a3 Reviewed-on: https://go-review.googlesource.com/c/go/+/520266 Auto-Submit: Ian Lance Taylor <iant@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Kirill Kolyshkin <kolyshkin@gmail.com>
2022-09-09syscall: add CgroupFD support for ForkExec on LinuxKir Kolyshkin
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>
2022-04-22syscall: define Syscall6 in terms of RawSyscall6 on linuxMichael Pratt
This is an exact copy of CL 388478 after fixing #52472 in CL 401654. For #51087 For #52472 Change-Id: I6c6bd7ddcab1512c682e6b44f61c7bcde97f5c58 Reviewed-on: https://go-review.googlesource.com/c/go/+/401655 Run-TryBot: Michael Pratt <mpratt@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-04-21syscall: define Syscall in terms of RawSyscall on linuxMichael Pratt
This is a re-do of CL 388477, fixing #52472. It is unsafe to call syscall.RawSyscall from syscall.Syscall with -coverpkg=all and -race. This is because: 1. Coverage adds a sync/atomic call in RawSyscall to increment the coverage counter. 2. Race mode instruments sync/atomic calls with TSAN runtime calls. TSAN eventually calls runtime.racecallbackfunc, which expects getg().m.p != 0, which is no longer true after entersyscall(). cmd/go actually avoids adding coverage instrumention to package runtime in race mode entirely to avoid these kinds of problems. Rather than also excluding all of syscall for this one function, work around by calling RawSyscall6 instead, which avoids coverage instrumention both by being written in assembly and in package runtime/*. For #51087 Fixes #52472 Change-Id: Iaffd27df03753020c4716059a455d6ca7b62f347 Reviewed-on: https://go-review.googlesource.com/c/go/+/401654 Run-TryBot: Michael Pratt <mpratt@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-04-21Revert "syscall: define Syscall in terms of RawSyscall on linux"Michael Pratt
This reverts CL 388477, which breaks cmd/go TestScript/cover_pkgall_runtime. For #51087. For #52472. Change-Id: Id58af419a889281f15df2471c58fece011fcffbc Reviewed-on: https://go-review.googlesource.com/c/go/+/401636 Run-TryBot: Michael Pratt <mpratt@google.com> Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
2022-04-21Revert "syscall: define Syscall6 in terms of RawSyscall6 on linux"Michael Pratt
This reverts CL 388478. Parent CL 388477 breaks cmd/go TestScript/cover_pkgall_runtime. For #51087. For #52472. Change-Id: Id5d5a4e138792cf130ecdcc6b996c8102d142a7e Reviewed-on: https://go-review.googlesource.com/c/go/+/401635 Run-TryBot: Michael Pratt <mpratt@google.com> Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
2022-04-21syscall: define Syscall6 in terms of RawSyscall6 on linuxMichael Pratt
For #51087 Change-Id: I4a5b5cb74f12db8999c6ff0e98c3034b58af3959 Reviewed-on: https://go-review.googlesource.com/c/go/+/388478 Run-TryBot: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
2022-04-21syscall: define Syscall in terms of RawSyscall on linuxMichael Pratt
For #51087 Change-Id: I9de7e85ccf137ae73662759382334bcbe7208150 Reviewed-on: https://go-review.googlesource.com/c/go/+/388477 Run-TryBot: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
2022-04-21syscall: define RawSyscall in terms of RawSyscall6 on linuxMichael Pratt
For #51087 Change-Id: I63e07638507328efe33dbf7dd5f8a8b78890e037 Reviewed-on: https://go-review.googlesource.com/c/go/+/388476 Run-TryBot: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
2022-04-21runtime/internal/syscall, syscall: replace RawSyscall6 with runtime ↵Michael Pratt
implementation on linux For #51087 Change-Id: I75a1bdeb5089454595f5ca04765a9c6e45cf9bd5 Reviewed-on: https://go-review.googlesource.com/c/go/+/388475 Run-TryBot: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-16syscall: call ABIInternal entersyscall on register ABI platformsCherry Mui
Currently, when register ABI is used, syscall.Syscall calls entersyscall via a wrapper, so the actual entersyscall records the caller PC and SP of the wrapper. At the point of the actual syscall, the wrapper frame is gone, so the recorded PC and SP are technically invalid. Furthermore, in some functions on some platforms (e.g. Syscall9 on NetBSD/AMD64), that frame is overwritten. If we unwind the stack from the recorded syscallpc and syscallsp, it may go wrong. Fix this by calling the ABIInternal function directly. exitsyscall calls are changed as well. It doesn't really matter, just changed for consistency. Change-Id: Iead8dd22cf32b05e382414fef664b7c4c1719b7c Reviewed-on: https://go-review.googlesource.com/c/go/+/376356 Trust: Cherry Mui <cherryyz@google.com> Run-TryBot: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
2022-03-03syscall, runtime/internal/syscall: always return 0 in r2 on ppc64{,le} linux ↵Paul E. Murphy
syscalls Both endians perform syscalls similarly. Only CR0S0 and R3 hold the resultant status of a syscall. A random value may be stored into the second return value (r2) result in some cases. Always set it to zero. Fixes #51192 Change-Id: Ida6a5692578d2cdadf3099af28478b3bc364f623 Reviewed-on: https://go-review.googlesource.com/c/go/+/385796 Run-TryBot: Paul Murphy <murp@ibm.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com> Trust: Paul Murphy <murp@ibm.com>
2021-11-06all: remove more leftover // +build linesTobias Klauser
CL 344955 and CL 359476 removed almost all // +build lines, but leaving some assembly files and generating scripts. Also, some files were added with // +build lines after CL 359476 was merged. Remove these or rename files where more appropriate. For #41184 Change-Id: I7eb85a498ed9788b42a636e775f261d755504ffa Reviewed-on: https://go-review.googlesource.com/c/go/+/361480 Trust: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-05-04syscall: add //go:build lines to assembly filesTobias Klauser
Change-Id: Ie296af523d70def269f9fb2ae35dfd2893abb2d9 Reviewed-on: https://go-review.googlesource.com/c/go/+/315275 Trust: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-05-15syscall: implement rawVforkSyscall for linux/ppc64x and linux/s390xJoel Sing
This allows the use of CLONE_VFORK and CLONE_VM for fork/exec, preventing "fork/exec ...: cannot allocate memory" failures from occuring when attempting to execute commands from a Go process that has a large memory footprint. Additionally, this should reduce the latency of fork/exec on these platforms. The same problem was addressed on linux/amd64 via issue #5838. Updates #31936 Change-Id: I7ae0fbbeaa29cab944a49a11272a380d497eb2d0 Reviewed-on: https://go-review.googlesource.com/c/go/+/175697 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-02-13syscall: support syscalls without error return on LinuxTobias Klauser
Add the rawSyscallNoError wrapper function which is used for Linux syscalls that don't return an error and convert all applicable occurences of RawSyscall to use it instead. Fixes #22924 Change-Id: Iff1eddb54573d459faa01471f10398b3d38528dd Reviewed-on: https://go-review.googlesource.com/84485 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-06-06all: use RET instead of RETURN on ppc64Austin Clements
All of the architectures except ppc64 have only "RET" for the return mnemonic. ppc64 used to have only "RETURN", but commit cf06ea6 introduced RET as a synonym for RETURN to make ppc64 consistent with the other architectures. However, that commit was never followed up to make the code itself consistent by eliminating uses of RETURN. This commit replaces all uses of RETURN in the ppc64 assembly with RET. This was done with sed -i 's/\<RETURN\>/RET/' **/*_ppc64x.s plus one manual change to syscall/asm.s. Change-Id: I3f6c8d2be157df8841d48de988ee43f3e3087995 Reviewed-on: https://go-review.googlesource.com/10672 Reviewed-by: Rob Pike <r@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Minux Ma <minux@golang.org>
2014-12-05all: power64 is now ppc64Russ Cox
Fixes #8654. LGTM=austin R=austin CC=golang-codereviews https://golang.org/cl/180600043
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