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: unify handling of alternate signal stack

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

29
src/runtime/os_darwin.go
View file

@ -183,21 +183,7 @@ func minit() {
// The signal handler handles it directly.
// The sigaltstack assembly function does nothing.
if GOARCH != "arm" && GOARCH != "arm64" {
var st stackt
sigaltstack(nil, &st)
if st.ss_flags&_SS_DISABLE != 0 {
signalstack(&_g_.m.gsignal.stack)
_g_.m.newSigstack = true
} else {
// Use existing signal stack.
stsp := uintptr(unsafe.Pointer(st.ss_sp))
_g_.m.gsignal.stack.lo = stsp
_g_.m.gsignal.stack.hi = stsp + st.ss_size
_g_.m.gsignal.stackguard0 = stsp + _StackGuard
_g_.m.gsignal.stackguard1 = stsp + _StackGuard
_g_.m.gsignal.stackAlloc = st.ss_size
_g_.m.newSigstack = false
}
minitSignalStack()
}
// restore signal mask from m.sigmask and unblock essential signals
@ -563,17 +549,10 @@ func getsig(i int32) uintptr {
return *(*uintptr)(unsafe.Pointer(&sa.__sigaction_u))
}
// setSignaltstackSP sets the ss_sp field of a stackt.
//go:nosplit
func signalstack(s *stack) {
var st stackt
if s == nil {
st.ss_flags = _SS_DISABLE
} else {
st.ss_sp = (*byte)(unsafe.Pointer(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 = (*byte)(unsafe.Pointer(sp))
}
//go:nosplit