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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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6
src/runtime/signal_openbsd.go
View file

@ -73,11 +73,7 @@ func sigtrampgo(sig uint32, info *siginfo, ctx unsafe.Pointer) {
setg(nil)
cgocallback(unsafe.Pointer(funcPC(sigNotOnStack)), noescape(unsafe.Pointer(&sig)), unsafe.Sizeof(sig), 0)
}
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
setGsignalStack(&st)
g.m.gsignal.stktopsp = getcallersp(unsafe.Pointer(&sig))
}