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 #include <stdint.h>
28 #include <stdlib.h>
29 #include <strings.h>
30
31 int
baz(void)32 baz(void)
33 {
34 return (8);
35 }
36
37 static int
foo(void)38 foo(void)
39 {
40 /*
41 * In order to assure that our helper is properly employed to identify
42 * the frame, we're going to trampoline through data.
43 */
44 uint32_t instr[] = {
45 0x9de3bfa0, /* save %sp, -0x60, %sp */
46 0x40000000, /* call baz */
47 0x01000000, /* nop */
48 0x81c7e008, /* ret */
49 0x81e80000 /* restore */
50 };
51 uint32_t *fp = malloc(sizeof (instr));
52
53 /*
54 * Do our little relocation dance.
55 */
56 instr[1] |= ((uintptr_t)baz - (uintptr_t)&fp[1]) >> 2;
57
58 /*
59 * Copy the code to the heap (it's a pain to build in ON with an
60 * executable stack).
61 */
62 bcopy(instr, fp, sizeof (instr));
63
64 (*(int (*)(void))fp)();
65
66 free(fp);
67
68 return (0);
69 }
70
71 int
main(int argc,char ** argv)72 main(int argc, char **argv)
73 {
74 for (;;) {
75 foo();
76 }
77
78 return (0);
79 }
80