--- a/src/syscall.c	Mon Dec 17 16:55:22 2018 +0900
+++ b/src/syscall.c	Thu Jan 17 19:11:19 2019 +0900
@@ -139,6 +139,15 @@
         [SYS_close]   =sys_close,
 };
 
+static __code (*cbccodes[])(void) = {
+	[SYS_cbc_read]	= cbc_read, 
+};
+
+__code cbc_ret(int ret){
+    proc->tf->r0 = ret;
+    goto cbc_trap_return();
+}
+
 void syscall(void)
 {
     int num;
@@ -148,6 +157,12 @@
 
     //cprintf ("syscall(%d) from %s(%d)\n", num, proc->name, proc->pid);
 
+    if((num > 0) && (num > NELEM(syscalls)) && cbccodes[num]) {
+	
+    	goto (cbccodes[num])(cbc_ret);
+    }
+
+
     if((num > 0) && (num <= NELEM(syscalls)) && syscalls[num]) {
         ret = syscalls[num]();