swapcontext.S revision 1.4
11.4Sthorpej/* $NetBSD: swapcontext.S,v 1.4 2020/10/21 01:24:05 thorpej Exp $ */ 21.2Sthorpej 31.2Sthorpej/*- 41.2Sthorpej * Copyright (c) 2001 The NetBSD Foundation, Inc. 51.2Sthorpej * All rights reserved. 61.2Sthorpej * 71.2Sthorpej * This code is derived from software contributed to The NetBSD Foundation 81.2Sthorpej * by Klaus Klein. 91.2Sthorpej * 101.2Sthorpej * Redistribution and use in source and binary forms, with or without 111.2Sthorpej * modification, are permitted provided that the following conditions 121.2Sthorpej * are met: 131.2Sthorpej * 1. Redistributions of source code must retain the above copyright 141.2Sthorpej * notice, this list of conditions and the following disclaimer. 151.2Sthorpej * 2. Redistributions in binary form must reproduce the above copyright 161.2Sthorpej * notice, this list of conditions and the following disclaimer in the 171.2Sthorpej * documentation and/or other materials provided with the distribution. 181.2Sthorpej * 191.2Sthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.2Sthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.2Sthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.2Sthorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.2Sthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.2Sthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.2Sthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.2Sthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.2Sthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.2Sthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.2Sthorpej * POSSIBILITY OF SUCH DAMAGE. 301.2Sthorpej */ 311.2Sthorpej 321.2Sthorpej#include "SYS.h" 331.4Sthorpej#include "assym.h" 341.2Sthorpej 351.2SthorpejNESTED(swapcontext, 2, 24, ra, IM_RA|IM_A0|IM_A1, 0) 361.2Sthorpej LDGP(pv) 371.2Sthorpej lda sp, -24(sp) 381.2Sthorpej stq ra, (24- 8)(sp) /* must save ra, oucp, ucp */ 391.2Sthorpej stq a0, (24-16)(sp) 401.2Sthorpej stq a1, (24-24)(sp) 411.2Sthorpej CALL(_getcontext) /* getcontext(oucp) */ 421.2Sthorpej ldq t0, (24-16)(sp) 431.2Sthorpej bne v0, Lerr 441.2Sthorpej ldq t1, (24- 8)(sp) 451.4Sthorpej stq t1, (UC_GREGS + _REG_RA*8)(t0) /* Adjust saved RA */ 461.4Sthorpej stq t1, (UC_GREGS + _REG_PC*8)(t0) /* Adjust saved PC */ 471.2Sthorpej lda t1, 24(sp) 481.4Sthorpej stq t1, (UC_GREGS + _REG_SP*8)(t0) /* Adjust saved SP */ 491.2Sthorpej 501.2Sthorpej ldq a0, (24-24)(sp) 511.2Sthorpej CALL(setcontext) /* setcontext(ucp) */ 521.2SthorpejLerr: 531.2Sthorpej ldq ra, (24- 8)(sp) 541.2Sthorpej lda sp, 24(sp) 551.2Sthorpej RET 561.2SthorpejEND(swapcontext) 57