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 2007 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include <stdint.h>
30#include <stdlib.h>
31#include <strings.h>
32
33int
34baz(void)
35{
36	return (8);
37}
38
39static int
40foo(void)
41{
42	/*
43	 * In order to assure that our helper is properly employed to identify
44	 * the frame, we're going to trampoline through data.
45	 */
46	uint8_t instr[] = {
47	    0x55,			/* pushl %ebp		*/
48	    0x8b, 0xec,			/* movl  %esp, %ebp	*/
49	    0xe8, 0x0, 0x0, 0x0, 0x0,	/* call  baz		*/
50	    0x8b, 0xe5,			/* movl  %ebp, %esp	*/
51	    0x5d,			/* popl  %ebp		*/
52	    0xc3			/* ret			*/
53	};
54	uint8_t *fp = malloc(sizeof (instr));
55
56	/*
57	 * Do our little relocation dance.
58	 */
59	*((int *)&instr[4]) = (uintptr_t)baz - (uintptr_t)&fp[8];
60
61	/*
62	 * Copy the code to the heap (it's a pain to build in ON with an
63	 * executable stack).
64	 */
65	bcopy(instr, fp, sizeof (instr));
66
67	(*(int (*)(void))fp)();
68
69	free(fp);
70
71	return (0);
72}
73
74int
75main(int argc, char **argv)
76{
77	for (;;) {
78		foo();
79	}
80
81	return (0);
82}
83