Add original unix v6

2018-01-27 22:35:41 +09:00
commit 2c7099ee50
664 changed files with 106254 additions and 0 deletions
@@ -0,0 +1,24 @@
+/ C library -- fork
+
+/ pid = fork();
+/
+/ pid == 0 in child process; pid == -1 means error return
+/ in child, parents id is in par_uid if needed
+
+.globl	_fork, cerror, _par_uid
+
+_fork:
+	mov	r5,-(sp)
+	mov	sp,r5
+	sys	fork
+		br 1f
+	bec	2f
+	jmp	cerror
+1:
+	mov	r0,_par_uid
+	clr	r0
+2:
+	mov	(sp)+,r5
+	rts	pc
+.bss
+_par_uid: .=.+2