restorer: don't use printk in restorer

BUG_ON_HANDLER from util.h may be used in restorer.
E.g. #include <util.h>
     #include <lock.h>

Now the process will be segfaulted and you can find a line
number in assemgler code. We will print messages a bit late.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>

include/restorer.h

@@ -345,20 +345,4 @@ task_get_entry(struct task_entries *base, int pid)
 	return NULL;
 }
 
-/* We need own handler */
-
-#ifdef BUG_ON_HANDLER
-# undef BUG_ON_HANDLER
-#endif
-
-#define BUG_ON_HANDLER(condition)					\
-	do {								\
-		if ((condition)) {					\
-			long tgid = sys_gettid();			\
-			write_hex_n(0x5a5a5a5a);			\
-			write_num_n(__LINE__);				\
-			sys_tgkill(tgid, tgid, SIGABRT);		\
-		}							\
-	} while (0)
-
 #endif /* CR_RESTORER_H__ */

include/util.h

@@ -87,6 +87,13 @@ extern void printk(const char *format, ...);
 	} while (0)
 
 #ifndef BUG_ON_HANDLER
+#ifdef CR_NOGLIBC
+#define BUG_ON_HANDLER(condition)					\
+	do {								\
+		if ((condition))					\
+			*(unsigned long *)NULL = 0xdead0000 + __LINE__;	\
+	} while (0)
+#else
 # define BUG_ON_HANDLER(condition)					\
 	do {								\
 		if ((condition)) {					\
@@ -95,6 +102,7 @@ extern void printk(const char *format, ...);
 		}							\
 	} while (0)
 #endif
+#endif
 
 #define BUG_ON(condition)	BUG_ON_HANDLER((condition))
 

restorer.c

@@ -1,3 +1,4 @@
+#define CR_NOGLIBC
 #include <stdio.h>
 #include <stdlib.h>