Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

runtime: document sigtrampgo better

Browse source 
Add an explanation of why sigtrampgo is nosplit.

Updates #21314.

Change-Id: I3f5909d2b2c180f9fa74d53df13e501826fd4316
Reviewed-on: https://go-review.googlesource.com/79615
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Austin Clements 2017-11-22 21:58:57 -05:00
parent b6cf58d5b8
commit 294963fb7f
1 changed files with 6 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/runtime/signal_unix.go
View file

@ -275,6 +275,12 @@ func sigpipe() {
// sigtrampgo is called from the signal handler function, sigtramp,
// written in assembly code.
// This is called by the signal handler, and the world may be stopped.
//
// It must be nosplit because getg() is still the G that was running
// (if any) when the signal was delivered, but it's (usually) called
// on the gsignal stack. Until this switches the G to gsignal, the
// stack bounds check won't work.
//
//go:nosplit
//go:nowritebarrierrec
func sigtrampgo(sig uint32, info *siginfo, ctx unsafe.Pointer) {