runtime: fixes for -buildmode=c-archive

    
    With -buildmode=c-archive, initsig is called before the memory
    allocator has been initialized.  The code was doing a memory
    allocation because of the call to funcPC(sigtramp).  When escape
    analysis is fully implemented, that call should not allocate.  For
    now, finesse the issue by calling a C function to get the C function
    pointer value of sigtramp.
    
    When returning from a call from C to a Go function, a deferred
    function is run to go back to syscall mode.  When the call occurs on a
    non-Go thread, that call sets g to nil, making it impossible to add
    the _defer struct back to the pool.  Just drop it and let the garbage
    collector clean it up.
    
    Reviewed-on: https://go-review.googlesource.com/33675


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@242992 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 3 insertions, 3 deletions

diff --git a/libgo/go/runtime/signal1_unix.go b/libgo/go/runtime/signal1_unix.go
index f9327651911a..d21bf4c31d7a 100644
--- a/libgo/go/runtime/signal1_unix.go
+++ b/libgo/go/runtime/signal1_unix.go
@@ -93,7 +93,7 @@ func initsig(preinit bool) {
 		}
 
 		t.flags |= _SigHandling
-		setsig(i, funcPC(sigtramp), true)
+		setsig(i, getSigtramp(), true)
 	}
 }
 
@@ -137,7 +137,7 @@ func sigenable(sig uint32) {
 		if t.flags&_SigHandling == 0 {
 			t.flags |= _SigHandling
 			fwdSig[sig] = getsig(int32(sig))
-			setsig(int32(sig), funcPC(sigtramp), true)
+			setsig(int32(sig), getSigtramp(), true)
 		}
 	}
 }
@@ -265,7 +265,7 @@ func raisebadsignal(sig int32, c *sigctxt) {
 	// We may receive another instance of the signal before we
 	// restore the Go handler, but that is not so bad: we know
 	// that the Go program has been ignoring the signal.
-	setsig(sig, funcPC(sigtramp), true)
+	setsig(sig, getSigtramp(), true)
 }
 
 func crash() {