10Sstevel@tonic-gate /* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 50Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 60Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 70Sstevel@tonic-gate * with the License. 80Sstevel@tonic-gate * 90Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 100Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 110Sstevel@tonic-gate * See the License for the specific language governing permissions 120Sstevel@tonic-gate * and limitations under the License. 130Sstevel@tonic-gate * 140Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 150Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 160Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 170Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 180Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 190Sstevel@tonic-gate * 200Sstevel@tonic-gate * CDDL HEADER END 210Sstevel@tonic-gate */ 22*1016Sraf 230Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */ 240Sstevel@tonic-gate /* All Rights Reserved */ 250Sstevel@tonic-gate 260Sstevel@tonic-gate /* 27*1016Sraf * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 280Sstevel@tonic-gate * Use is subject to license terms. 290Sstevel@tonic-gate */ 300Sstevel@tonic-gate 310Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 320Sstevel@tonic-gate 330Sstevel@tonic-gate #pragma weak swapcontext = _swapcontext 340Sstevel@tonic-gate 350Sstevel@tonic-gate #include "synonyms.h" 36*1016Sraf #include "thr_uberdata.h" 370Sstevel@tonic-gate #include <ucontext.h> 380Sstevel@tonic-gate #include <sys/types.h> 390Sstevel@tonic-gate 400Sstevel@tonic-gate int 410Sstevel@tonic-gate swapcontext(ucontext_t *oucp, const ucontext_t *nucp) 420Sstevel@tonic-gate { 430Sstevel@tonic-gate greg_t *reg; 440Sstevel@tonic-gate 450Sstevel@tonic-gate if (__getcontext_syscall(oucp)) 460Sstevel@tonic-gate return (-1); 470Sstevel@tonic-gate 480Sstevel@tonic-gate /* 490Sstevel@tonic-gate * Note that %o1 and %g1 are modified by the system call 500Sstevel@tonic-gate * routine. ABI calling conventions specify that the caller 510Sstevel@tonic-gate * can not depend upon %o0 thru %o5 nor g1, so no effort is 520Sstevel@tonic-gate * made to maintain these registers. %o0 is forced to reflect 530Sstevel@tonic-gate * an affirmative return code. 540Sstevel@tonic-gate */ 550Sstevel@tonic-gate reg = oucp->uc_mcontext.gregs; 560Sstevel@tonic-gate reg[REG_SP] = getfp(); 570Sstevel@tonic-gate reg[REG_O7] = caller(); 580Sstevel@tonic-gate reg[REG_PC] = reg[REG_O7] + 8; 590Sstevel@tonic-gate reg[REG_nPC] = reg[REG_PC] + 4; 600Sstevel@tonic-gate reg[REG_O0] = 0; 610Sstevel@tonic-gate 620Sstevel@tonic-gate return (setcontext((ucontext_t *)nucp)); 630Sstevel@tonic-gate } 64