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runtime, os/signal: use //go:linkname instead of assembly stubs to get access to runtime functions

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os/signal depends on a few unexported runtime functions. This removes the
assembly stubs it used to get access to these in favour of using
//go:linkname in runtime to make the functions accessible to os/signal.

This is motivated by ppc64le shared libraries, where you cannot BR to a symbol
defined in a shared library (only BL), but it seems like an improvment anyway.

Change-Id: I09361203ce38070bd3f132f6dc5ac212f2dc6f58
Reviewed-on: https://go-review.googlesource.com/15871
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
This commit is contained in:
Michael Hudson-Doyle 2015-10-16 09:56:07 +13:00
parent 4c2465d47d
commit 0b8d583320
4 changed files with 15 additions and 29 deletions
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4
src/runtime/sigqueue.go
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@ -90,6 +90,7 @@ Send:
// Called to receive the next queued signal.
// Must only be called from a single goroutine at a time.
//go:linkname signal_recv os/signal.signal_recv
func signal_recv() uint32 {
for {
// Serve any signals from local copy.
@ -127,6 +128,7 @@ func signal_recv() uint32 {
}
// Must only be called from a single goroutine at a time.
//go:linkname signal_enable os/signal.signal_enable
func signal_enable(s uint32) {
if !sig.inuse {
// The first call to signal_enable is for us
@ -145,6 +147,7 @@ func signal_enable(s uint32) {
}
// Must only be called from a single goroutine at a time.
//go:linkname signal_disable os/signal.signal_disable
func signal_disable(s uint32) {
if s >= uint32(len(sig.wanted)*32) {
return
@ -154,6 +157,7 @@ func signal_disable(s uint32) {
}
// Must only be called from a single goroutine at a time.
//go:linkname signal_ignore os/signal.signal_ignore
func signal_ignore(s uint32) {
if s >= uint32(len(sig.wanted)*32) {
return