1 files changed, 17 insertions, 0 deletions
diff --git a/src/tests/userprog/sc-bad-arg.c b/src/tests/userprog/sc-bad-arg.c
new file mode 100644
index 0000000..0b512a0
--- /dev/null
+++ b/src/tests/userprog/sc-bad-arg.c
@@ -0,0 +1,17 @@
+/* Sticks a system call number (SYS_EXIT) at the very top of the
+   stack, then invokes a system call with the stack pointer
+   (%esp) set to its address.  The process must be terminated
+   with -1 exit code because the argument to the system call
+   would be above the top of the user address space. */
+
+#include <syscall-nr.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  asm volatile ("movl $0xbffffffc, %%esp; movl %0, (%%esp); int $0x30"
+                : : "i" (SYS_EXIT));
+  fail ("should have called exit(-1)");
+}