Fixes #13214.

Change-Id: Id8fbb252b8beadb0b41f839dcd85d6165dea86a3
Reviewed-on: https://go-review.googlesource.com/16845Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

runtime/internal/sys will hold system-, architecture- and config-
specific constants.

Updates #11647

Change-Id: I6db29c312556087a42e8d2bdd9af40d157c56b54
Reviewed-on: https://go-review.googlesource.com/16817Reviewed-by: Russ Cox <rsc@golang.org>

The heapsampling.go test occasionally fails on some architectures
because it finds zero heap samples in main.alloc. This happens because
the byte and object counts are only updated at a GC. Hence, if a GC
happens part way through allocInterleaved, but then doesn't happen
after we start calling main.alloc, checkAllocations will see buckets
for the lines in main.alloc (which are created eagerly), but the
object and byte counts will be zero.

Fix this by forcing a GC to update the profile before we collect it.

Fixes #13098.

Change-Id: Ia7a9918eea6399307f10499dd7abefd4f6d13cf6
Reviewed-on: https://go-review.googlesource.com/16846
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

Correct an error in the last change: it caused runtime/cgo and
runtime/race to not depend on runtime.

Fixes #13214.

Change-Id: Ib48b3b5e9a74567ddfaccb7ab4a897ee2aedc2b8
Reviewed-on: https://go-review.googlesource.com/16837Reviewed-by: Michael Matloob <matloob@golang.org>

Explictly list the alternative formats in each file.  In AUTHORS, refer
to CONTRIBUTORS' definition of multiple email addresses.  Indent with
four spaces;  AUTHORS used a tab, but CONTRIBUTORS used four spaces.
s/Rietveld/Gerrit/

Change the tab separating Sebastien Binet from his email address,
added in 2010's 18b02f6c.

Change-Id: Id52228ae6b62dd88ad8098110c22373bf14e068f
Reviewed-on: https://go-review.googlesource.com/16826Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

lfstack.go:19: println call ends with newline

Change-Id: I2a903eef80a5300e9014999c2f0bc5d40ed5c735
Reviewed-on: https://go-review.googlesource.com/16836
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>

cgo_ppc64x.go:7: +build comment must appear before package clause and be followed by a blank line

Change-Id: Ib6dedddae70cc75dc3f137eb37ea338a64f8b595
Reviewed-on: https://go-review.googlesource.com/16835
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Andrew Gerrand <adg@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I9161c4a7e747d35ad7643b8cf0fe8b66eaea963b
Reviewed-on: https://go-review.googlesource.com/16842Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I22ea3352ad0794fc611334c2f2ec5f1e894985ce
Reviewed-on: https://go-review.googlesource.com/14460Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

Skip fixedbugs/issue10607.go because external linking is not supported
yet.

Skip nilptr3.go because of issue #9058 (same as ppc64).

Change-Id: Ib3dfbd9a03ee4052871cf57c74b3cc5e745e1f80
Reviewed-on: https://go-review.googlesource.com/14461Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I419f3b8bf1bddffd4a775b0cd7b98f0239fe19cb
Reviewed-on: https://go-review.googlesource.com/14458Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Ib6f168b6a2daf3befbf75b4b95967ff91ac95d12
Reviewed-on: https://go-review.googlesource.com/14456Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

mips64 strace doesn't support sendfile64 and will error out if we
specify that with `-e trace='. So we use sendfile for mips64 here.

Change-Id: If5e2bb39866ca3a77dcc40e4db338ba486921d89
Reviewed-on: https://go-review.googlesource.com/14455Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I77c6768fff6f0163b36800307c4d573bb6521fe5
Reviewed-on: https://go-review.googlesource.com/14454Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I05352749a852095baae2f67fd71ffcf5f727538d
Reviewed-on: https://go-review.googlesource.com/14453Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I84ced3734410d3d05f195901f44d33f4ae6036b1
Reviewed-on: https://go-review.googlesource.com/14452Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I5129a5b9dbbc57d97da723c2fc247bd28f951817
Reviewed-on: https://go-review.googlesource.com/14451Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: Ibe6c345afd4cbae7e2542a350043fbb6b81d5678
Reviewed-on: https://go-review.googlesource.com/14450Reviewed-by: Minux Ma <minux@golang.org>

Syscall getdents64 is relatively new in linux/mips64, only since kernel
version 3.10. To support older kernel, syscall getdents is used for
mips64.

Change-Id: I892b05dff7d93e7ddb0d700abd6a5e6d4084ab4c
Reviewed-on: https://go-review.googlesource.com/14449Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I574a2b702bb3db596f890ae7b18fb4bc1fd358d5
Reviewed-on: https://go-review.googlesource.com/14448Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

Linux/mips64 uses a different signal table. To avoid code copying,
signal table is factored out from signal_linux.go to
sigtab_linux_generic.go. And a mips64-specific version is added.

Change-Id: I842d7a7467c330bf772855fde01aecc77a42316b
Reviewed-on: https://go-review.googlesource.com/14993Reviewed-by: Ian Lance Taylor <iant@golang.org>

Linux/mips64 has a different sigset type and some different constants.
os2_linux.go is renamed to os2_linux_generic.go, and not used in mips64.
The corresponding file os2_linux_mips64x.go is added.

Change-Id: Ief83845a2779f7fe048d236d3c7da52b627ab533
Reviewed-on: https://go-review.googlesource.com/14992Reviewed-by: Minux Ma <minux@golang.org>

Linux/mips64 uses a different type of sigset. To deal with it, related
functions in os1_linux.go is refactored to os1_linux_generic.go
(used for non-mips64 architectures), and os1_linux_mips64x.go (only used
in mips64{,le}), to avoid code copying.

Change-Id: I5cadfccd86bfc4b30bf97e12607c3c614903ea4c
Reviewed-on: https://go-review.googlesource.com/14991Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I381c03d957a0dccae5f655f02e92760e5c0e9629
Reviewed-on: https://go-review.googlesource.com/14929Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

files for unsupported architectures are deleted, as it would require
changing cmd/dist to recognize their names as build tags (probably
need a separated CL).

Change-Id: Ifd164b014867d39b4924d1b859fb84317dce4ab0
Reviewed-on: https://go-review.googlesource.com/14928Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I14b537922b97d4bce9e0523d98a822da906348f1
Reviewed-on: https://go-review.googlesource.com/14447Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: Ia496470e48b3c5d39fb9fef99fac356dfb73a949
Reviewed-on: https://go-review.googlesource.com/14927Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I2eaf0658771a0ff788429e2f503d116531166315
Reviewed-on: https://go-review.googlesource.com/16834Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I9e94027ef66c88007107de2b2b75c3d7cf1352af
Reviewed-on: https://go-review.googlesource.com/14467Reviewed-by: Minux Ma <minux@golang.org>

The actual cgo is not supported for now. This is just the cgo command.

Change-Id: I25625100ee552971f47e681b7d613cba16a2132f
Reviewed-on: https://go-review.googlesource.com/14446Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

It is based on ppc64 compiler.

Change-Id: I15a101df05f2919ba5292136957ba0009227d067
Reviewed-on: https://go-review.googlesource.com/14445Reviewed-by: Minux Ma <minux@golang.org>

Only internal linking without cgo is supported for now.

Change-Id: Ie6074a8ff3ec13605b72028f2d60758034f87185
Reviewed-on: https://go-review.googlesource.com/14444Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I951387f88993715e86b6ab9f18d38ed5c691ee0f
Reviewed-on: https://go-review.googlesource.com/14443Reviewed-by: Minux Ma <minux@golang.org>

MIPS64 has 32 general purpose 64-bit integer registers (R0-R31), 32
64-bit floating point registers (F0-F31). Instructions are fixed-width,
and are 32-bit wide. Instructions are all in standard 1-, 2-, 3-operand
forms.

MIPS64-specific relocations are added. For this reason, test data of
cmd/newlink are regenerated.

No other changes are made to portable structures.

Branch delay slots are current filled with NOP instructions. The function
for instruction scheduling (try to fill the delay slot with a useful
instruction) is implemented but disabled for now.

Change-Id: Ic364999c7a33245260c1381fc26a2fa8972d38b3
Reviewed-on: https://go-review.googlesource.com/14442Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: Ie5f70af7e673bb2c691a45c28db2c017e6cddd4f
Reviewed-on: https://go-review.googlesource.com/16833Reviewed-by: Minux Ma <minux@golang.org>

Applies to types fixAlloc, mCache, mCentral, mHeap, mSpan, and
mSpanList.

Two special cases:

1. mHeap_Scavenge() previously didn't take an *mheap parameter, so it
was specially handled in this CL.

2. mHeap_Free() would have collided with mheap's "free" field, so it's
been renamed to (*mheap).freeSpan to parallel its underlying
(*mheap).freeSpanLocked method.

Change-Id: I325938554cca432c166fe9d9d689af2bbd68de4b
Reviewed-on: https://go-review.googlesource.com/16221Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

It was disabled because of the lack of external linking.

Change-Id: Iccb4a4ef8c57d048d53deabe4e0f4e6b9dccce33
Reviewed-on: https://go-review.googlesource.com/16797Reviewed-by: Ian Lance Taylor <iant@golang.org>

If you say "go install -buildmode=shared a b" and package a depends on another
package c, package c is implicitly included in the resulting shared library (as
specified by "Go Execution Modes"). But if c depends on b, linking against this
shared library hangs, because the go tool doesn't know when computing c's
dependencies that c is part of the same shared library as c.

Fix this by tracking the shared library a package *is* in separately from the
shared library a package has been explicitly linked into.

Fixes #13044

Change-Id: Iacfedab24ae9731ed53d225678b447a2a888823c
Reviewed-on: https://go-review.googlesource.com/16338
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

I want to use CX as a scratch register in position independent code and these
uses are easy to remove.

Change-Id: I9e3cb470d7f0000d85786c30bd769d9ec86d532a
Reviewed-on: https://go-review.googlesource.com/16382Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The linker writes the number of file symbols (Nhistfile) to the filetab slice
and then Nhistfile offsets -- which means the slice contains Nhistfile+1
entries, not just Nhistfile.

I think this bug has been around since at least 1.4 but it's easier to trigger
with shared libraries and a tiny binary that only has a couple of functions in
it -- try go install -buildmode=shared std && go run -linkshared test/fixedbugs/issue4388.go.

Change-Id: I6c0f01f1e607b9b2b96872e37ffce81281911504
Reviewed-on: https://go-review.googlesource.com/16342
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>