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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright 1996-2003 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #pragma weak swapcontext = _swapcontext 34 35 #include "synonyms.h" 36 #include <ucontext.h> 37 #include <sys/types.h> 38 #include "libc.h" 39 40 int 41 swapcontext(ucontext_t *oucp, const ucontext_t *nucp) 42 { 43 greg_t *reg; 44 45 if (__getcontext_syscall(oucp)) 46 return (-1); 47 48 /* 49 * Note that %o1 and %g1 are modified by the system call 50 * routine. ABI calling conventions specify that the caller 51 * can not depend upon %o0 thru %o5 nor g1, so no effort is 52 * made to maintain these registers. %o0 is forced to reflect 53 * an affirmative return code. 54 */ 55 reg = oucp->uc_mcontext.gregs; 56 reg[REG_SP] = getfp(); 57 reg[REG_O7] = caller(); 58 reg[REG_PC] = reg[REG_O7] + 8; 59 reg[REG_nPC] = reg[REG_PC] + 4; 60 reg[REG_O0] = 0; 61 62 return (setcontext((ucontext_t *)nucp)); 63 } 64