Update SPT page entry to change type from EXECUTABLE to PAGE_FILE to capture mmaps in addition to executables

src/userprog/syscall.c

@@ -444,7 +444,7 @@ syscall_mmap (int fd, void *addr)
       off_t zero_bytes = PGSIZE - read_bytes;
 
       if (page_insert (file, ofs, addr + ofs, read_bytes, zero_bytes, true,
-                       PAGE_EXECUTABLE) == NULL)
+                       PAGE_FILE) == NULL)
         return MMAP_FAILURE;
     }
 
@@ -457,9 +457,11 @@ syscall_mmap (int fd, void *addr)
   return mmap->mapping;
 }
 
-/* Handles the syscall for unmapping a memory mapped file. */
+/* Handles the syscall for unmapping a memory mapped file.
+
+    Pre: mapping is a valid mapping identifier returned by mmap syscall.*/
 static void
-syscall_munmap (mapid_t mapping UNUSED)
+syscall_munmap (mapid_t mapping)
 {
 
 }