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path: root/src/runtime/os2_aix.go
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2021-02-19runtime: clean up system calls during cgo callback initRuss Cox
During a cgocallback, the runtime calls needm to get an m. The calls made during needm cannot themselves assume that there is an m or a g (which is attached to the m). In the old days of making direct system calls, the only thing you had to do for such functions was mark them //go:nosplit, to avoid the use of g in the stack split prologue. But now, on operating systems that make system calls through shared libraries and use code that saves state in the g or m before doing so, it's not safe to assume g exists. In fact, it is not even safe to call getg(), because it might fault deferencing the TLS storage to find the g pointer (that storage may not be initialized yet, at least on Windows, and perhaps on other systems in the future). The specific routines that are problematic are usleep and osyield, which are called during lock contention in lockextra, called from needm. All this is rather subtle and hidden, so in addition to fixing the problem on Windows, this CL makes the fact of not running on a g much clearer by introducing variants usleep_no_g and osyield_no_g whose names should make clear that there is no g. And then we can remove the various sketchy getg() == nil checks in the existing routines. As part of this cleanup, this CL also deletes onosstack on Windows. onosstack is from back when the runtime was implemented in C. It predates systemstack but does essentially the same thing. Instead of having two different copies of this code, we can use systemstack consistently. This way we need not port onosstack to each architecture. This CL is part of a stack adding windows/arm64 support (#36439), intended to land in the Go 1.17 cycle. This CL is, however, not windows/arm64-specific. It is cleanup meant to make the port (and future ports) easier. Change-Id: I3352de1fd0a3c26267c6e209063e6e86abd26187 Reviewed-on: https://go-review.googlesource.com/c/go/+/288793 Trust: Russ Cox <rsc@golang.org> Trust: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
2020-12-01[dev.regabi] cmd/compile: process //go:linknames after declarationsMatthew Dempsky
Allows emitting errors about ineffectual //go:linkname directives. In particular, this exposed: a typo in os2_aix.go; redundant (but harmless) directives for libc_pipe in both os3_solaris.go and syscall2_solaris.go; and a bunch of useless //go:linkname directives in macOS wrapper code. However, because there's also ineffectual directives in the vendored macOS code from x/sys, that can't be an error just yet. So instead we print a warning (including a heads up that it will be promoted to an error in Go 1.17) to prevent backsliding while we fix and re-vendor that code. Passes toolstash-check. Change-Id: I59badeab5df0d8b3abfd14c6066e9bb00e840f73 Reviewed-on: https://go-review.googlesource.com/c/go/+/273986 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Trust: Matthew Dempsky <mdempsky@google.com>
2020-10-29runtime: move ppc64/aix cpu feature detection to internal/cpuMartin Möhrmann
Additionally removed unused PPC64.IsPOWER8 CPU feature detection. Change-Id: I1411b03d396a72e08d6d51f8a1d1bad49eaa720e Reviewed-on: https://go-review.googlesource.com/c/go/+/266077 Trust: Martin Möhrmann <moehrmann@google.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
2019-12-09runtime: use mprotect in sysMap for aix/ppc64Clément Chigot
AIX doesn't allow to mmap an already mmap address. The previous way to deal with this behavior was to munmap before calling mmap again. However, mprotect syscall is able to change protections on a memory range. Thus, memory mapped by sysReserve can be remap using it. Note that sysMap is always called with a non-nil pointer so mprotect is always possible. Updates: #35451 Change-Id: I1fd1e1363d9ed9eb5a8aa7c8242549bd6dad8cd0 Reviewed-on: https://go-review.googlesource.com/c/go/+/207237 Reviewed-by: Austin Clements <austin@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
2019-10-26runtime: M-targeted signals for libc-based OSesAustin Clements
For #10958, #24543. Change-Id: I82bee63b49e15bd5a53228eb85179814c80437ef Reviewed-on: https://go-review.googlesource.com/c/go/+/201403 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com>
2019-10-21runtime: change read and write to return negative errno valueIan Lance Taylor
The internal read and write functions used to return -1 on error; change them to return a negative errno value instead. This will be used by later CLs in this series. For most targets this is a simplification, although for ones that call into libc it is a complication. Updates #27707 Change-Id: Id02bf9487f03e7e88e4f2b85e899e986738697ad Reviewed-on: https://go-review.googlesource.com/c/go/+/171823 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
2019-10-20runtime: define nonblockingPipeIan Lance Taylor
This requires defining pipe, pipe2, and setNonblock for various platforms. The new function is currently only used on AIX. It will be used by later CLs in this series. Updates #27707 Change-Id: Id2f987b66b4c66a3ef40c22484ff1d14f58e9b31 Reviewed-on: https://go-review.googlesource.com/c/go/+/171822 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-09-08all: fix typosAinar Garipov
Use the following (suboptimal) script to obtain a list of possible typos: #!/usr/bin/env sh set -x git ls-files |\ grep -e '\.\(c\|cc\|go\)$' |\ xargs -n 1\ awk\ '/\/\// { gsub(/.*\/\//, ""); print; } /\/\*/, /\*\// { gsub(/.*\/\*/, ""); gsub(/\*\/.*/, ""); }' |\ hunspell -d en_US -l |\ grep '^[[:upper:]]\{0,1\}[[:lower:]]\{1,\}$' |\ grep -v -e '^.\{1,4\}$' -e '^.\{16,\}$' |\ sort -f |\ uniq -c |\ awk '$1 == 1 { print $2; }' Then, go through the results manually and fix the most obvious typos in the non-vendored code. Change-Id: I3cb5830a176850e1a0584b8a40b47bde7b260eae Reviewed-on: https://go-review.googlesource.com/c/go/+/193848 Reviewed-by: Robert Griesemer <gri@golang.org>
2019-09-04runtime: wrap nanotime, walltime, and writeAustin Clements
In preparation for general faketime support, this renames the existing nanotime, walltime, and write functions to nanotime1, walltime1, and write1 and wraps them with trivial Go functions. This will let us inject different implementations on all platforms when faketime is enabled. Updates #30439. Change-Id: Ice5ccc513a32a6d89ea051638676d3ee05b00418 Reviewed-on: https://go-review.googlesource.com/c/go/+/192738 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-04-29runtime: make mmap return 0 instead of -1 on aix/ppc64Clément Chigot
Most of the platforms are returning 0 instead of -1 when mmap syscalls is failing. This patch corrects it for AIX in order to fix TestMmapErrorSign and to improve AIX compatibility. Change-Id: I1dad88d0e69163ad55c504b2b4a997892fd876cd Reviewed-on: https://go-review.googlesource.com/c/go/+/174297 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-04-18runtime: move libcall to stack for runtime syscalls on AIXClément Chigot
As the stackguard was increased on AIX by CL 157117, every syscalls can now have libcall directly on the stack. This fixes some concurrency bugs which seems to occur when semasleep is interrupted by a SIGPROF signal. Change-Id: I905a9618d13ef227dad6f8328b0f958f2f917a5b Reviewed-on: https://go-review.googlesource.com/c/go/+/172359 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-04-12runtime: add //go:cgo_unsafe_args to AIX syscallX functionsClément Chigot
On AIX, syscallX functions are using the first argument to retrieve the next arguments when calling asmcgocall. Therefore,//go:cgo_unsafe_args is needed. Change-Id: I7fe0fbf0c961250a6573c66a8b0eb897dff94bfe Reviewed-on: https://go-review.googlesource.com/c/go/+/171723 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-27runtime: create library startup for aix/ppc64Clément Chigot
As .init_array section aren't available on AIX, the Go runtime initialization is made with gcc constructor attribute. However, as cgo tool is building a binary in order to get imported C symbols, Go symbols imported for this initilization must be ignored. -Wl,-berok is mandatory otherwize ld will fail to create this binary, _rt0_aix_ppc64_lib and runtime_rt0_go aren't defined in runtime/cgo. These two symbols must also be ignored when creating _cgo_import.go. Change-Id: Icf2e0282f5b50de5fa82007439a428e6147efef1 Reviewed-on: https://go-review.googlesource.com/c/go/+/169118 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-05runtime: handle syscalls without g or m for aix/ppc64Clément Chigot
With cgo, some syscalls will be called with g == nil or m == nil. SyscallX functions cannot handle them so they call an equivalent function in sys_aix_ppc64.s which will directly call this syscall. Change-Id: I6508ec772b304111330e6833e7db729200af547c Reviewed-on: https://go-review.googlesource.com/c/go/+/164001 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-12-18runtime: fix backtrace during C syscalls for aix/ppc64Clément Chigot
This commit fixes backtrace if a crash or an exit signal is received during a C syscall on aix/ppc64. This is similar to Solaris, Darwin or Windows implementation. Change-Id: I6040c0b1577a9f5b298f58bd4ee6556258a135ef Reviewed-on: https://go-review.googlesource.com/c/154718 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-10-31internal/cpu, runtime: add CPU feature detection support for AIXClément Chigot
AIX doesn't have HWCAP/HWCAP2 variables like Linux. Therefore, it relies on getsystemcfg syscall which can provide some information about the CPU. Change-Id: Ic0dc927e80890d4bf8f0bdfb43fad1e2b890d7a0 Reviewed-on: https://go-review.googlesource.com/c/144959 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Martin Möhrmann <moehrmann@google.com>
2018-10-03runtime: add AIX operating systemClément Chigot
This commit adds AIX operating system to runtime package for ppc64 architecture. Only new files and minor changes are in this commit. Others modifications in files like asm_ppc64.s will be in separate commits. Updates: #25893 Change-Id: I9c5e073f5f3debb43b004ad1167694a5afd31cfd Reviewed-on: https://go-review.googlesource.com/c/138716 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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