eclair-dump-backtrace.exp: handle user space threads

arch/x86/tools/eclair-dump-backtrace.exp.in

@@ -8,19 +8,36 @@ set state "init"
 set thread_id 0
 
 expect {
+	"in ?? ()" {
+		switch -- $state {
+			"thread_chosen" {
+				set state "thread_skip"
+			}
+			"thread_bt" {
+				set state "thread_skip"
+			}
+		}
+
+		exp_continue
+	}
 	"(eclair) " {
 		switch -- $state {
 			"init" {
-				set state "threads"
+				set state "threads_list"
 				send "info threads\r"
 			}
-			"threads" {
+			"threads_list" {
 				incr thread_id
-				set state "thread_bt"
+				set state "thread_chosen"
 				send "thread $thread_id\r"
 			}
-			"thread_bt" {
-				set state "threads"
+			"thread_skip" {
+				incr thread_id
+				set state "thread_chosen"
+				send "thread $thread_id\r"
+			}
+			"thread_chosen" {
+				set state "thread_bt"
 				send "bt\r"
 			}
 		}
@@ -28,7 +45,17 @@ expect {
 		exp_continue
 	}
 	"Type <return> to continue, or q <return> to quit" { 
-		send "\r"
+		switch -- $state {
+			"threads_list" {
+				send "\r"
+			}
+			"thread_bt" {
+				send "\r"
+			}
+			"thread_skip" {
+				send "q\r"
+			}
+		}
 		exp_continue 
 	}
 	" not known." {