/*      $NetBSD: swapcontext.S,v 1.5 2021/07/06 12:38:40 thorpej Exp $  */

/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include "SYS.h"
#include "assym.h"

#define FRAME_SIZE      32
#define FRAME_RA        (32-16)
#define FRAME_OUCP      (32-24)
#define FRAME_UCP       (32-32)

NESTED(swapcontext, 2, FRAME_SIZE, ra, IM_RA|IM_A0|IM_A1, 0)
       LDGP(pv)
       lda     sp, -FRAME_SIZE(sp)
       stq     ra, FRAME_RA(sp)        /* must save ra, oucp, ucp */
       stq     a0, FRAME_OUCP(sp)
       stq     a1, FRAME_UCP(sp)
       CALL(_getcontext)               /* getcontext(oucp) */
       ldq     t0, FRAME_OUCP(sp)
       bne     v0, Lerr
       ldq     t1, FRAME_RA(sp)
       stq     t1, (UC_GREGS + _REG_RA*8)(t0)  /* Adjust saved RA */
       stq     t1, (UC_GREGS + _REG_PC*8)(t0)  /* Adjust saved PC */
       lda     t1, FRAME_SIZE(sp)
       stq     t1, (UC_GREGS + _REG_SP*8)(t0)  /* Adjust saved SP */

       ldq     a0, FRAME_UCP(sp)
       CALL(setcontext)                /* setcontext(ucp) */
Lerr:
       ldq     ra, FRAME_RA(sp)
       lda     sp, FRAME_SIZE(sp)
       RET
END(swapcontext)

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