1 files changed, 61 insertions, 0 deletions
diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
new file mode 100644
index 0000000..4d46978
--- /dev/null
+++ b/src/userprog/syscall.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <syscall-nr.h>
+#include "userprog/syscall.h"
+#include "threads/interrupt.h"
+#include "threads/thread.h"
+
+/* header files you probably need, they are not used yet */
+#include <string.h>
+#include "filesys/filesys.h"
+#include "filesys/file.h"
+#include "threads/vaddr.h"
+#include "threads/init.h"
+#include "userprog/pagedir.h"
+#include "userprog/process.h"
+#include "devices/input.h"
+
+static void syscall_handler (struct intr_frame *);
+
+void
+syscall_init (void) 
+{
+  intr_register_int (0x30, 3, INTR_ON, syscall_handler, "syscall");
+}
+
+
+/* This array defined the number of arguments each syscall expects.
+   For example, if you want to find out the number of arguments for
+   the read system call you shall write:
+   
+   int sys_read_arg_count = argc[ SYS_READ ];
+   
+   All system calls have a name such as SYS_READ defined as an enum
+   type, see `lib/syscall-nr.h'. Use them instead of numbers.
+ */
+const int argc[] = {
+  /* basic calls */
+  0, 1, 1, 1, 2, 1, 1, 1, 3, 3, 2, 1, 1, 
+  /* not implemented */
+  2, 1,    1, 1, 2, 1, 1,
+  /* extended */
+  0
+};
+
+static void
+syscall_handler (struct intr_frame *f) 
+{
+  int32_t* esp = (int32_t*)f->esp;
+  
+  switch ( 0 /* retrive syscall number */ )
+  {
+    default:
+    {
+      printf ("Executed an unknown system call!\n");
+      
+      printf ("Stack top + 0: %d\n", esp[0]);
+      printf ("Stack top + 1: %d\n", esp[1]);
+      
+      thread_exit ();
+    }
+  }
+}