17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 58cd45542Sraf * Common Development and Distribution License (the "License"). 68cd45542Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 210ec57554Sraf 227c478bd9Sstevel@tonic-gate /* 238cd45542Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 278cd45542Sraf /* Copyright (c) 1988 AT&T */ 288cd45542Sraf /* All Rights Reserved */ 298cd45542Sraf 30*7257d1b4Sraf #pragma weak _swapcontext = swapcontext 317c478bd9Sstevel@tonic-gate 32*7257d1b4Sraf #include "lint.h" 330ec57554Sraf #include "thr_uberdata.h" 347c478bd9Sstevel@tonic-gate #include <ucontext.h> 357c478bd9Sstevel@tonic-gate #include <sys/types.h> 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate int swapcontext(ucontext_t * oucp,const ucontext_t * nucp)387c478bd9Sstevel@tonic-gateswapcontext(ucontext_t *oucp, const ucontext_t *nucp) 397c478bd9Sstevel@tonic-gate { 407c478bd9Sstevel@tonic-gate greg_t *reg; 417c478bd9Sstevel@tonic-gate 428cd45542Sraf if (__getcontext(oucp)) 437c478bd9Sstevel@tonic-gate return (-1); 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate /* 467c478bd9Sstevel@tonic-gate * Note that %o1 and %g1 are modified by the system call 477c478bd9Sstevel@tonic-gate * routine. ABI calling conventions specify that the caller 487c478bd9Sstevel@tonic-gate * can not depend upon %o0 thru %o5 nor g1, so no effort is 497c478bd9Sstevel@tonic-gate * made to maintain these registers. %o0 is forced to reflect 507c478bd9Sstevel@tonic-gate * an affirmative return code. 517c478bd9Sstevel@tonic-gate */ 527c478bd9Sstevel@tonic-gate reg = oucp->uc_mcontext.gregs; 537c478bd9Sstevel@tonic-gate reg[REG_SP] = getfp(); 547c478bd9Sstevel@tonic-gate reg[REG_O7] = caller(); 557c478bd9Sstevel@tonic-gate reg[REG_PC] = reg[REG_O7] + 8; 567c478bd9Sstevel@tonic-gate reg[REG_nPC] = reg[REG_PC] + 4; 577c478bd9Sstevel@tonic-gate reg[REG_O0] = 0; 587c478bd9Sstevel@tonic-gate 597c478bd9Sstevel@tonic-gate return (setcontext((ucontext_t *)nucp)); 607c478bd9Sstevel@tonic-gate } 61