From 7826c4030ea1651e31463cd7986de4007d8e041b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Thu, 4 Feb 2021 10:56:18 +0100
Subject: syscall_handler(): parse syscall number

---
 src/userprog/syscall.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/userprog/syscall.c')

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 370c89b..e15555e 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -15,6 +15,15 @@ syscall_init (void)
 static void
 syscall_handler (struct intr_frame *f UNUSED) 
 {
-  printf ("system call!\n");
+  int syscall_number = *((int *)f->esp);
+  switch (syscall_number) {
+    case 9:
+      // printf
+      printf ("printf: %s", *((char **)(f->esp+8)));
+      break;
+    default:
+      printf ("kernel: unknown syscall '%d'\n", syscall_number);
+      break;
+  }
   thread_exit ();
 }
-- 
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