1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #pragma weak _swapcontext = swapcontext 33 34 #include "lint.h" 35 #include "thr_uberdata.h" 36 #include <ucontext.h> 37 #include <sys/types.h> 38 39 int 40 swapcontext(ucontext_t *oucp, const ucontext_t *nucp) 41 { 42 greg_t *reg; 43 44 if (__getcontext(oucp)) 45 return (-1); 46 47 /* 48 * Note that %o1 and %g1 are modified by the system call 49 * routine. ABI calling conventions specify that the caller 50 * can not depend upon %o0 thru %o5 nor g1, so no effort is 51 * made to maintain these registers. %o0 is forced to reflect 52 * an affirmative return code. 53 */ 54 reg = oucp->uc_mcontext.gregs; 55 reg[REG_SP] = getfp(); 56 reg[REG_O7] = caller(); 57 reg[REG_PC] = reg[REG_O7] + 8; 58 reg[REG_nPC] = reg[REG_PC] + 4; 59 reg[REG_O0] = 0; 60 61 return (setcontext((ucontext_t *)nucp)); 62 } 63