Add gostartcall and gostartcallfn.
The old gogocall = gostartcall + gogo.
The old gogocallfn = gostartcallfn + gogo.

R=dvyukov, minux.ma
CC=golang-dev
https://golang.org/cl/10036044

Fixes #5641.

R=golang-dev, dave, daniel.morsing, iant
CC=golang-dev, kcc
https://golang.org/cl/10126044

In starttheworld() we assume that P's with local work
are situated in the beginning of idle P list.
However, once we start the first M, it can execute all local G's
and steal G's from other P's.
That breaks the assumption above. Thus starttheworld() will fail
to start some P's with local work.
It seems that it can not lead to very bad things, but still
it's wrong and breaks other assumtions
(e.g. we can have a spinning M with local work).
The fix is to collect all P's with local work first,
and only then start them.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/10051045

TBR=dvyukov
CC=golang-dev
https://golang.org/cl/10229043

TBR=dvyukov
CC=golang-dev
https://golang.org/cl/10227044

The garbage collection routine addframeroots is duplicating
logic in the traceback routine that calls it, sometimes correctly,
sometimes incorrectly, sometimes incompletely.
Pass necessary information to addframeroots instead of
deriving it anew.

Should make addframeroots significantly more robust.
It's certainly smaller.

Also try to standardize on uintptr for saved pc, sp values.

Will make CL 10036044 trivial.

R=golang-dev, dave, dvyukov
CC=golang-dev
https://golang.org/cl/10169045

# bufio
coverage analysis cannot handle package (bufio_test imports testing imports bufio)
# bytes
coverage analysis cannot handle package (bytes_test imports encoding/base64 imports bytes)
# crypto/cipher
coverage analysis cannot handle package (cipher_test imports crypto/aes imports crypto/cipher)
# debug/dwarf
coverage analysis cannot handle package (dwarf_test imports debug/elf imports debug/dwarf)
# errors
coverage analysis cannot handle package (errors_test imports fmt imports errors)
# flag
coverage analysis cannot handle package (flag_test imports testing imports flag)
# fmt
coverage analysis cannot handle package (fmt_test imports testing imports fmt)
# go/ast
coverage analysis cannot handle package (ast_test imports go/format imports go/ast)
# image
coverage analysis cannot handle package (image_test imports image/gif imports image)
# io
coverage analysis cannot handle package (io_test imports bytes imports io)
# math
coverage analysis cannot handle package (math_test imports fmt imports math)
# net/http
coverage analysis cannot handle package (http_test imports net/http/httptest imports net/http)
# os
coverage analysis cannot handle package (os_test imports flag imports os)
# path/filepath
coverage analysis cannot handle package (filepath_test imports io/ioutil imports path/filepath)
# reflect
coverage analysis cannot handle package (reflect_test imports flag imports reflect)
# runtime
coverage analysis cannot handle package (runtime_test imports fmt imports runtime)
# runtime/pprof
coverage analysis cannot handle package (pprof_test imports testing imports runtime/pprof)
# sort
coverage analysis cannot handle package (sort_test imports testing imports sort)
# strconv
coverage analysis cannot handle package (strconv_test imports fmt imports strconv)
# strings
coverage analysis cannot handle package (strings_test imports testing imports strings)
# sync
coverage analysis cannot handle package (sync_test imports fmt imports sync)
# sync/atomic
coverage analysis cannot handle package (atomic_test imports testing imports sync/atomic)
# syscall
coverage analysis cannot handle package (syscall_test imports flag imports syscall)
# text/tabwriter
coverage analysis cannot handle package (tabwriter_test imports testing imports text/tabwriter)
# time
coverage analysis cannot handle package (time_test imports encoding/gob imports time)
# unicode
coverage analysis cannot handle package (unicode_test imports testing imports unicode)
# unicode/utf8
coverage analysis cannot handle package (utf8_test imports bytes imports unicode/utf8)

R=r
CC=golang-dev
https://golang.org/cl/10216043

Fixes #5655.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9944044

R=golang-dev, rsc
CC=golang-dev, jhoak
https://golang.org/cl/10217043

Separates correct from erroneous output so errors running the tool will appear
in the log.

R=rsc
CC=golang-dev
https://golang.org/cl/10191043

This avoids problems with inlining in genwrappers, which
occurs after functions have been compiled.  Compiling a
function may cause some unused local vars to be removed from
the list.  Since a local var may be unused due to
optimization, it is possible that a removed local var winds up
beingused in the inlined version, in which case hilarity
ensues.

Fixes #5515.

R=golang-dev, khr, dave
CC=golang-dev
https://golang.org/cl/10210043

It was off in the old implementation (because there was no high-level
description of the function at all). Maybe some day the race detector
should be fixed to handle the wrapper and then enabled for it, but there's
no reason that has to be today.

R=golang-dev
TBR=dvyukov
CC=golang-dev
https://golang.org/cl/10037045

Fixes #5463.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9239045

in case we have weird (not page aligned) memory limit.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/10199043

There's no reason to use a different name on each architecture,
and doing so makes it impossible for portable code to refer to
the original Go runtime entry point. Rename it _rt0_go everywhere.

This is a global search and replace only.

R=golang-dev, bradfitz, minux.ma
CC=golang-dev
https://golang.org/cl/10196043

Fixes #5244.

R=golang-dev, rsc, iant, r, daniel.morsing
CC=golang-dev
https://golang.org/cl/8601044

Fixes #5431.

R=dvyukov, remyoudompheng, rsc
CC=gobot, golang-dev
https://golang.org/cl/9910043

This feature is not yet ready for real use. The CL marks a bite-sized
piece that is ready for review. TODOs that remain:
        provide control over output
        produce output without setting -v
        make work on reflect, sync and time packages
                (fail now due to link errors caused by inlining)
        better documentation
Almost all packages work now, though, if clumsily; try:
        go test -v -cover=count encoding/binary

R=rsc
CC=gobot, golang-dev, remyoudompheng
https://golang.org/cl/10050045

R=cshapiro, dvyukov, khr, rsc
CC=golang-dev
https://golang.org/cl/10005044

Requires adding new linker instruction
        RET	f(SB)
meaning return but then immediately call f.
This is what you'd use to implement a tail call after
fiddling with the arguments, but the compiler only
uses it in genwrapper.

This CL eliminates the copy-and-paste genembedtramp
functions from 5g/8g/6g and makes the code run on ARM
for the first time. It removes a small special case for function
generation, which should help Carl a bit, but at the same time
it does not bother to implement general tail call optimization,
which we do not want anyway.

Fixes #5627.

R=ken2
CC=golang-dev
https://golang.org/cl/10057044

Fixes #5615.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/9651047

The first identifier in an Object Identifer must be between 0 and 2
inclusive. The range of values that the second one can take depends
on the value of the first one.
The two first identifiers are not necessarily encoded in a single octet,
but in a varint.

R=golang-dev, agl
CC=golang-dev
https://golang.org/cl/10140046

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10159043

The new code matches the code in cc/lex.c and the #define GETC.
This was causing problems scanning runtime·foo if the leading
· byte was returned by the buffer fill.

R=ken2
CC=golang-dev
https://golang.org/cl/10167043

Fixes #5111.
Update #4718
This CL makes BL (Rx) to use BLX Rx instead of:
MOV LR, PC
MOV PC, Rx

R=cshapiro, rsc
CC=dave, gobot, golang-dev
https://golang.org/cl/9669045

Update #5641.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/10144043

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10137043

Fixes #4078.

R=golang-dev, bradfitz, rsc, iant
CC=golang-dev
https://golang.org/cl/7100050

R=golang-dev, bradfitz, gri, iant, rsc
CC=golang-dev
https://golang.org/cl/7235044

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10150043

R=golang-dev, iant, bradfitz, dave
CC=golang-dev
https://golang.org/cl/7430044

Fixes #5567.

R=golang-dev, dave, iant
CC=golang-dev
https://golang.org/cl/10085043

Do not synchronize Add(1) with Wait().
Imitate read on first Add(1) and write on Wait(),
it allows to catch common misuses of WaitGroup:
- Add() called in the additional goroutine itself
- incorrect reuse of WaitGroup with multiple waiters

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10093044

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/10085050

Fixes #5619.

R=golang-dev, r, peter.armitage, go.peter.90
CC=golang-dev
https://golang.org/cl/9952044

Also reduce FixAlloc allocation granulatiry from 128k to 16k,
small programs do not need that much memory for MCache's and MSpan's.

R=golang-dev, khr
CC=golang-dev
https://golang.org/cl/10140044

Reduces heap size.

R=golang-dev, khr
CC=golang-dev
https://golang.org/cl/10140043

Especially important for Windows because it reserves VM
only in multiple of 64k.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/10082048

Reduces heap size.

R=golang-dev, remyoudompheng, bradfitz
CC=golang-dev
https://golang.org/cl/10139043

Especially important for Windows because it reserves VM
only in multiple of 64k.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/10138043