feat: allow stack to grow for process up to 8MB in size

src/userprog/exception.c

@@ -4,6 +4,7 @@
 #include "userprog/gdt.h"
 #include "threads/interrupt.h"
 #include "threads/thread.h"
+#include "vm/stackgrowth.h"
 
 /* Number of page faults processed. */
 static long long page_fault_cnt;
@@ -145,6 +146,12 @@ page_fault (struct intr_frame *f)
   write = (f->error_code & PF_W) != 0;
   user = (f->error_code & PF_U) != 0;
 
+   if (user && needs_new_page (fault_addr, f->esp))
+     {
+       if (grow_stack (fault_addr))
+        return;
+     }
+
   /* To implement virtual memory, delete the rest of the function
      body, and replace it with code that brings in the page to
      which fault_addr refers. */