Complete project

src/common.h

@@ -31,6 +31,13 @@ typedef uint32_t vaddr_t;
 #define USER_BASE 0x1000000
 
 #define SSTATUS_SPIE (1 << 5)
+#define SSTATUS_SUM (1 << 18)
+
+#define SYS_PUTCHAR 1
+#define SYS_GETCHAR 2
+#define SYS_EXIT 3
+#define SYS_READFILE 4
+#define SYS_WRITEFILE 5
 
 void *memset(void *buf, char c, size_t n);
 void *memcpy(void *dst, const void *src, size_t n);