1/* $NetBSD: swapcontext.S,v 1.5 2021/07/06 12:38:40 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "SYS.h" 33#include "assym.h" 34 35#define FRAME_SIZE 32 36#define FRAME_RA (32-16) 37#define FRAME_OUCP (32-24) 38#define FRAME_UCP (32-32) 39 40NESTED(swapcontext, 2, FRAME_SIZE, ra, IM_RA|IM_A0|IM_A1, 0) 41 LDGP(pv) 42 lda sp, -FRAME_SIZE(sp) 43 stq ra, FRAME_RA(sp) /* must save ra, oucp, ucp */ 44 stq a0, FRAME_OUCP(sp) 45 stq a1, FRAME_UCP(sp) 46 CALL(_getcontext) /* getcontext(oucp) */ 47 ldq t0, FRAME_OUCP(sp) 48 bne v0, Lerr 49 ldq t1, FRAME_RA(sp) 50 stq t1, (UC_GREGS + _REG_RA*8)(t0) /* Adjust saved RA */ 51 stq t1, (UC_GREGS + _REG_PC*8)(t0) /* Adjust saved PC */ 52 lda t1, FRAME_SIZE(sp) 53 stq t1, (UC_GREGS + _REG_SP*8)(t0) /* Adjust saved SP */ 54 55 ldq a0, FRAME_UCP(sp) 56 CALL(setcontext) /* setcontext(ucp) */ 57Lerr: 58 ldq ra, FRAME_RA(sp) 59 lda sp, FRAME_SIZE(sp) 60 RET 61END(swapcontext) 62