.NLIST	TOC,SYM
.TITLE	$SAVVR
.SBTTL	ULBLIB 003	- Save and restore volatile registers
.IDENT	\V01.01\
.PSECT	.LIBC.
.ENABL	LC

; Copyright (c) 1998 by Mentec, Inc., Nashua, NH.
; All rights reserved
;
; This software is furnished under a license for use only on a
; single computer system and  may  be  copied  only  with  the
; inclusion of the above copyright notice.  This software,  or
; any other copies thereof, may not be provided  or  otherwise
; made available to any other person except for  use  on  such
; system and to one who agrees to these license  terms.  Title
; to  and  ownership of the software shall at all times remain
; in Mentec, Inc.
;
; The information in this document is subject to change without
; notice and should not be construed as a commitment by Digital
; Equipment Corporation, or Mentec, Inc.
;
; Digital and Mentec  assume  no  responsibility for the use or
; reliability of its software on equipment which is not supplied
; by Digital  or Mentec,  and listed  in the  Software  Product
; Description.
;+
; $SAVVR
; Famous register save/restore coroutine (#3)
;
;	JSR	R2,$SAVVR
;
;	R0-R2 saved/restored
;-

$SAVVR::
	MOV	R1,-(SP)	;Save R1
	MOV	R0,-(SP)	;Save R0
	MOV	R2,-(SP)	;Save return address
	MOV	6(SP),R2	;Get real R2
	JSR	PC,@(SP)+	;Call the caller
	MOV	(SP)+,R0	; and R0
	MOV	(SP)+,R1	; and R1
	MOV	(SP)+,R2	; and R2
	RETURN

.END