Draft: lab 5 failed

userprog/include/syscall.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <stddef.h>
+
+uint64_t syscall(int32_t num, ...);
+
+int32_t getpid(void);
+size_t uart_read(char buf[], size_t size);
+size_t uart_write(const char buf[], size_t size);
+int32_t exec(const char *name, char *const argv[]);
+int32_t fork(void);
+void exit(int32_t status);
+int32_t mbox_call(uint8_t ch, uint32_t *mbox);
+void kill(int32_t pid);