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runtime: unify handling of alternate signal stack

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Change all Unix systems to use stackt for the alternate signal
stack (some were using sigaltstackt). Add OS-specific setSignalstackSP
function to handle different types for ss_sp field, and unify all
OS-specific signalstack functions into one. Unify handling of alternate
signal stack in OS-specific minit and sigtrampgo functions via new
functions minitSignalstack and setGsignalStack.

Change-Id: Idc316dc69b1dd725717acdf61a1cd8b9f33ed174
Reviewed-on: https://go-review.googlesource.com/29757
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Ian Lance Taylor 2016-09-25 13:38:54 -07:00
parent e6143e17d3
commit d15295c679
40 changed files with 110 additions and 286 deletions
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15
src/runtime/os_netbsd.go
View file

@ -35,7 +35,7 @@ func setitimer(mode int32, new, old *itimerval)
func sigaction(sig int32, new, old *sigactiont)
//go:noescape
func sigaltstack(new, old *sigaltstackt)
func sigaltstack(new, old *stackt)
//go:noescape
func sigprocmask(how int32, new, old *sigset)
@ -303,17 +303,10 @@ func getsig(i int32) uintptr {
return sa.sa_sigaction
}
// setSignaltstackSP sets the ss_sp field of a stackt.
//go:nosplit
func signalstack(s *stack) {
var st sigaltstackt
if s == nil {
st.ss_flags = _SS_DISABLE
} else {
st.ss_sp = s.lo
st.ss_size = s.hi - s.lo
st.ss_flags = 0
}
sigaltstack(&st, nil)
func setSignalstackSP(s *stackt, sp uintptr) {
s.ss_sp = sp
}
//go:nosplit