1*e415d488SLionel Sambuc/* $NetBSD: _resumecontext.S,v 1.7 2012/09/12 02:00:52 manu Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras/*- 42fe8fb19SBen Gras * Copyright (c) 2001 The NetBSD Foundation, Inc. 52fe8fb19SBen Gras * All rights reserved. 62fe8fb19SBen Gras * 72fe8fb19SBen Gras * This code is derived from software contributed to The NetBSD Foundation 82fe8fb19SBen Gras * by Wayne Knowles. 92fe8fb19SBen Gras * 102fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 112fe8fb19SBen Gras * modification, are permitted provided that the following conditions 122fe8fb19SBen Gras * are met: 132fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 142fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 152fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 162fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 172fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 182fe8fb19SBen Gras * 192fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 202fe8fb19SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 212fe8fb19SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 222fe8fb19SBen Gras * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 232fe8fb19SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 242fe8fb19SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 252fe8fb19SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 262fe8fb19SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 272fe8fb19SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 282fe8fb19SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 292fe8fb19SBen Gras * POSSIBILITY OF SUCH DAMAGE. 302fe8fb19SBen Gras */ 312fe8fb19SBen Gras 322fe8fb19SBen Gras#include <machine/asm.h> 332fe8fb19SBen Gras 342fe8fb19SBen Gras#include "SYS.h" 352fe8fb19SBen Gras#include "assym.h" 362fe8fb19SBen Gras 372fe8fb19SBen Gras#if defined(SYSLIBC_SCCS) && !defined(lint) 38*e415d488SLionel Sambuc RCSID("$NetBSD: _resumecontext.S,v 1.7 2012/09/12 02:00:52 manu Exp $") 392fe8fb19SBen Gras#endif /* SYSLIBC_SCCS && !lint */ 402fe8fb19SBen Gras 412fe8fb19SBen Gras .set reorder 422fe8fb19SBen Gras .hidden _C_LABEL(__resumecontext) 432fe8fb19SBen Gras 442fe8fb19SBen GrasLEAF_NOPROFILE(__resumecontext) 452fe8fb19SBen Gras /* 462fe8fb19SBen Gras * We get here not by a call through $t9 but thru $ra after the 472fe8fb19SBen Gras * function passed to makecontext returns. 482fe8fb19SBen Gras */ 492fe8fb19SBen Gras PTR_SUBU sp, sp, UCONTEXT_SIZE # get space for ucontext 502fe8fb19SBen Gras move a0, sp # arg0 for getcontext 512fe8fb19SBen Gras PTR_S zero, _OFFSETOF_UC_LINK(a0) # make sure uc_link is 0 522fe8fb19SBen Gras SYSTRAP(getcontext) # get context 532fe8fb19SBen Gras PTR_L a0, _OFFSETOF_UC_LINK(a0) # linked context? 542fe8fb19SBen Gras beq a0, zero, 1f # nope, exit process 552fe8fb19SBen Gras nop 56*e415d488SLionel Sambuc PIC_TAILCALL(setcontext) # yes, become it. 572fe8fb19SBen Gras /* NOTREACHED (in theory) */ 582fe8fb19SBen Gras li a0, -1 # failure, 592fe8fb19SBen Gras1: 602fe8fb19SBen Gras SYSTRAP(exit) # all hope is lost. 612fe8fb19SBen Gras /* NOTREACHED */ 622fe8fb19SBen GrasEND(__resumecontext) 63