1 files changed, 20 insertions, 0 deletions
diff --git a/src/tests/userprog/sc-bad-sp.c b/src/tests/userprog/sc-bad-sp.c
new file mode 100644
index 0000000..39cce84
--- /dev/null
+++ b/src/tests/userprog/sc-bad-sp.c
@@ -0,0 +1,20 @@
+/* Invokes a system call with the stack pointer (%esp) set to a
+   bad address.  The process must be terminated with -1 exit
+   code. 
+
+   For Project 3: The bad address lies approximately 64MB below
+   the code segment, so there is no ambiguity that this attempt
+   must be rejected even after stack growth is implemented.
+   Moreover, a good stack growth heuristics should probably not
+   grow the stack for the purpose of reading the system call
+   number and arguments. */
+
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  asm volatile ("movl $.-(64*1024*1024), %esp; int $0x30");
+  fail ("should have called exit(-1)");
+}