runtime: unify handling of alternate signal stack

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>

1 files changed, 1 insertions, 8 deletions

diff --git a/src/runtime/defs1_solaris_amd64.go b/src/runtime/defs1_solaris_amd64.go
index 85a7b4002d..5ee3c3fc27 100644
--- a/src/runtime/defs1_solaris_amd64.go
+++ b/src/runtime/defs1_solaris_amd64.go
@@ -110,20 +110,13 @@ type semt struct {
 	sem_pad2  [2]uint64
 }
 
-type sigaltstackt struct {
-	ss_sp     *byte
-	ss_size   uint64
-	ss_flags  int32
-	pad_cgo_0 [4]byte
-}
-
 type sigset struct {
 	__sigbits [4]uint32
 }
 
 type stackt struct {
 	ss_sp     *byte
-	ss_size   uint64
+	ss_size   uintptr
 	ss_flags  int32
 	pad_cgo_0 [4]byte
 }