1 files changed, 22 insertions, 0 deletions
diff --git a/src/tests/userprog/sc-boundary.c b/src/tests/userprog/sc-boundary.c
new file mode 100644
index 0000000..d889535
--- /dev/null
+++ b/src/tests/userprog/sc-boundary.c
@@ -0,0 +1,22 @@
+/* Invokes a system call with the system call number and its
+   argument on separate pages.  This must work. */
+
+#include <syscall-nr.h>
+#include "tests/userprog/boundary.h"
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  /* Put a syscall number at the end of one page
+     and its argument at the beginning of another. */
+  int *p = get_boundary_area ();
+  p--;
+  p[0] = SYS_EXIT;
+  p[1] = 42;
+
+  /* Invoke the system call. */
+  asm volatile ("movl %0, %%esp; int $0x30" : : "g" (p));
+  fail ("should have called exit(42)");
+}