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      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 _getcontext = getcontext
     33 
     34 #include "lint.h"
     35 #include "thr_uberdata.h"
     36 #include <ucontext.h>
     37 #include <sys/types.h>
     38 
     39 int
     40 getcontext(ucontext_t *ucp)
     41 {
     42 	greg_t *reg;
     43 
     44 	ucp->uc_flags = UC_ALL;
     45 	if (__getcontext(ucp))
     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 	 * cannot depend upon %o0 through %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 = ucp->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 (0);
     63 }
     64