LoweredAtomicLoad8 is implemented using MOVBU, hence it is already zero
extended. LoweredAtomicCas32 and LoweredAtomicCas64 return a properly
typed boolean.
Change-Id: Ie0acbaa19403d59c7e5f76d060cc13ee51eb7834
Reviewed-on: https://go-review.googlesource.com/c/go/+/428214
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
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Implement Slicemask the same way every other architecture does - negate
then arithmetic right shift. This sets or clears the sign bit, before
extending it to the entire register.
Removes around 2,500 instructions from the Go binary on linux/riscv64.
Change-Id: I4d675b826e7eb23fe2b1e6e46b95dcd49ab49733
Reviewed-on: https://go-review.googlesource.com/c/go/+/426354
Reviewed-by: Meng Zhuo <mzh@golangcn.org>
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Updates #54854
Change-Id: Ibaf4eea14a6259cdbca79e9e95db1602966f18e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/428176
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Updates #54854
Change-Id: Ie18665e93e477b6f220acf4c6c070b2af4343064
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Updates #54854
Change-Id: I9c14f9fa595f73eae44eb714abc5d486915893c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/428155
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Change-Id: I840262eefff1073a452a243b9e31f61b53362fcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/428360
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Change-Id: Ieb15b54d36f18d1fbccbafe5451a4758df797718
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Change-Id: If675277e17b97500100e46ec6fe471260131bafc
Reviewed-on: https://go-review.googlesource.com/c/go/+/428358
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Change-Id: I24fb36a0591782c07f26c3289265aa41a643666d
Reviewed-on: https://go-review.googlesource.com/c/go/+/428357
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Change-Id: Ic463bd6d52e7d1d50d2dbd2122b4d514e0b4af60
Reviewed-on: https://go-review.googlesource.com/c/go/+/428755
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Change-Id: I251f734adbaf83aa03e3f4f37add4e116f5af093
Reviewed-on: https://go-review.googlesource.com/c/go/+/428271
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Having an executable bit set for a binary is not enough for it to be
executable -- there might be more checks in the kernel. For example,
binaries on a filesystem mounted with "noexec" flag couldn't be
executed. There might be other scenarios involving ACLs, SELinux,
file capabilities, and so on.
As a result, LookPath might either find a non-executable (while going
over $PATH elements), or return a false positive that the argument
provided is an executable.
One possible fix would be to perform the check by using access(2)
syscall with X_OK flag.
Now, since access(2) uses real (rather than effective) uid and gid,
when used by a setuid or setgid binary, it checks permissions of the
(real) user who started the binary, rather than the actual effective
permissions. Therefore, using access with X_OK won't work as expected
for setuid/setgid binaries.
To fix this, modern platforms added ways to check against effective uid
and gid, with the most common being the faccessat(2) call with the
AT_EACCESS flag, as described by POSIX.1-2008 (in Linux, only
faccessat2(2) supports flags such as AT_EACCESS). Let's use it, and fall
back to checking permission bits if faccessat is not available.
Wrap the logic into unix.Eaccess, which is currently only implemented on
Linux. While many other OSes (Free/Net/OpenBSD, AIX, Solaris/Illumos, and
Darwin) do implement faccessat(2) with AT_EACCESS, it is not wired in
syscall package (except for AIX), so these platforms are left out for now.
In the future, eaccess can be implemented for these OSes, too.
Alas, a call to unix.Eaccess is not enough since we have to filter out
directories, so use both stat and Eaccess.
One minor change introduced by this commit is that LookPath and Command
now returns "is a directory" error when the argument contains a slash
and is a directory. This is similar to what e.g. bash does on Linux:
$ bash -c /etc
bash: line 1: /etc: Is a directory
Add a test case, which, unfortunately, requires root, is specific to
Linux, and needs a relatively new kernel (supporting faccessat2). Other
platforms either have different semantics for tmpfs with noexec, or have
different ways to set up a binary which has x bit set but nevertheless
could not be executed.
Change-Id: If49b6ef6bf4dd23b2c32bebec8832d83e511a4bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/414824
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Change-Id: I754edcf21e003a3f4037fb2c5d8d06f2cd5f2fa3
Reviewed-on: https://go-review.googlesource.com/c/go/+/428267
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Change-Id: I3861a73d6b9d1d454c42bec50099b916bf30f1cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/428266
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The parent, file, and line fields are no longer used now that we have
parentPc to find the parent and NOPs in the parent to attach file/line
pcdata to.
Removing these fields reduces the binary size of cmd/go on linux-amd64
by 1.1%.
Fixes#54849.
Change-Id: If58f08622736b2b322288608776f8bedf0c3fd17
Reviewed-on: https://go-review.googlesource.com/c/go/+/427960
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For defer/go calls, the function/method value are evaluated immediately.
So after devirtualizing, it may trigger a panic when implicitly deref
a nil pointer receiver, causing the program behaves unexpectedly.
It's safer to not devirtualizing defer/go calls at all.
Fixes#52072
Change-Id: I562c2860e3e577b36387dc0a12ae5077bc0766bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/428495
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Change-Id: I5d4c89a8d87a8697d038bf91b17d7ffc847a49c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/428137
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Change-Id: I9658c37a548a386c57d83dc13d5e9925a9c13211
Reviewed-on: https://go-review.googlesource.com/c/go/+/428140
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Change-Id: I05ebaf4e11b5b6ca7d9bbb0b2241def7773b11cc
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The writev syscall is available since at least Solaris 11.3.
Reuse the existing illumos writev wrapper on solaris to implement
internal/poll.writev for net.(*netFD).writeBuffers.
Change-Id: I23adc3bb4637740c72bfb61bfa9697b432dfe3db
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Change-Id: Ie5a8ae104970237e6e33e75cae807c436bcd08e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/428268
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Change-Id: I407d11b43349cd78b709deb7b0e774bd93922caa
Reviewed-on: https://go-review.googlesource.com/c/go/+/428269
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Change-Id: Ifb51413894791154489bd1d4f529088958212c62
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The triv.go example serves the entire contents of $HOME by default.
That seems bad, let's not do that.
Also change it to listen on localhost only.
Change-Id: I8f1b7bd6b7d737852273e2ba82deabc4a2d11f6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/428237
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Noticed while analyzing test failures on go.dev/cl/427714 that were
pointing to withTCPConnPair instead of the failing tests.
Change-Id: Ie2366962c2253e0c2a6546d3b7f43a96390bc7bb
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errClosed was introduced by CL 163058 and was supposed to be removed by CL 243906,
but somehow it was left out, now we should get it deleted.
Change-Id: I74c4b36b8bbc4844e1860acb022a16b0aa3272b2
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The file was added in CL 181839 which was submitted in 2019.
Also delete the superfluous //go:build windows build constraint which is
already part of the file name.
Change-Id: Iecdf3d75848a7b8e2a76cd18c9fff4fb90acdac2
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Happy to use another service if web.archive.org isn't suitable.
Note: the original page redirects and then links to some nsfw content.
Change-Id: Ie93ca0c6aad871881f35b7e5609b96da5c14cfc0
GitHub-Last-Rev: ced5a97eb5
GitHub-Pull-Request: golang/go#54857
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CL 424257 modified gentraceback to switch gp when jumping from a
system stack to a user stack to simplify reasoning through the rest of
the function. This has the unintended side-effect of also switching
all references to gp.m. The vast majority of the time, g0.m and curg.m
are the same across a stack switch, making this a no-op, but there's
at least one case where this isn't true: if a profiling signal happens
in execute between setting mp.curg and setting gp.m. In this case,
mp.curg.m is briefly nil, which can cause gentraceback to crash with a
nil pointer dereference. We see this failure (surprisingly
frequently!) in profiling tests in the morestack=mayMoreStackPreempt
testing mode (#48297).
Fix this by making only jumping stacks if doing so will not switch Ms.
This restores the original property that gp.m doesn't change across
the stack jump, and makes gentraceback a little more conservative
about jumping stacks.
Fixes#54885.
Change-Id: Ib1524c41c748eeff35896e0f3abf9a7efbe5969f
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Change-Id: I02c4664f1ba72623a5470e92bbebabb2f4862428
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Change-Id: Ibab20627ccd1f79e77e3972e2bc6ca42c2c7de13
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Change-Id: I0a51aa9e7800689c123ce3eaf74742a4641b7681
Reviewed-on: https://go-review.googlesource.com/c/go/+/428261
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Change-Id: Ib07699df8ea41fd8d1bca8ad050859fac24623de
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Change-Id: I59db11212758b478248f34c031501a167335348c
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