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acid/kernel: for stacktraces, try to use context from error stack when process is not sleeping

when a process state has not been saved (Proc.mach != nil)
then the contents of Proc.sched should be considered invalid.

to approximate a stacktrace in this case, we use the error
stack and get a stacktrace from the last waserror() call.

--- a/sys/lib/acid/kernel

+++ b/sys/lib/acid/kernel

@@ -271,12 +271,23 @@

 defn procstk(p) {

 	complex Proc p;

+	local l, n;

 	if p.state != 0 then {	// 0 is Dead

+		if p.mach == 0 then {

+			l = p.sched;

+		} else {

+			n = p.nerrlab;

+			if n == 0 then {

+				return 0;

+			}

+			l = p.errlab + (n-1)*sizeofLabel;

+		}

+		complex Label l;

 		if objtype=="386" || objtype=="amd64" then

-			_stk(gotolabel, p.sched.sp, linkreg(0), 0);

+			_stk(gotolabel, l.sp, linkreg(0), 0);

 		else

-			_stk(p.sched.pc, p.sched.sp, linkreg(0), 0);

+			_stk(l.pc, l.sp, linkreg(0), 0);

 	}

 }