1*2be1a816SJohn Birrell /*
2*2be1a816SJohn Birrell * CDDL HEADER START
3*2be1a816SJohn Birrell *
4*2be1a816SJohn Birrell * The contents of this file are subject to the terms of the
5*2be1a816SJohn Birrell * Common Development and Distribution License (the "License").
6*2be1a816SJohn Birrell * You may not use this file except in compliance with the License.
7*2be1a816SJohn Birrell *
8*2be1a816SJohn Birrell * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*2be1a816SJohn Birrell * or http://www.opensolaris.org/os/licensing.
10*2be1a816SJohn Birrell * See the License for the specific language governing permissions
11*2be1a816SJohn Birrell * and limitations under the License.
12*2be1a816SJohn Birrell *
13*2be1a816SJohn Birrell * When distributing Covered Code, include this CDDL HEADER in each
14*2be1a816SJohn Birrell * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*2be1a816SJohn Birrell * If applicable, add the following below this CDDL HEADER, with the
16*2be1a816SJohn Birrell * fields enclosed by brackets "[]" replaced with your own identifying
17*2be1a816SJohn Birrell * information: Portions Copyright [yyyy] [name of copyright owner]
18*2be1a816SJohn Birrell *
19*2be1a816SJohn Birrell * CDDL HEADER END
20*2be1a816SJohn Birrell */
21*2be1a816SJohn Birrell
22*2be1a816SJohn Birrell /*
23*2be1a816SJohn Birrell * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
24*2be1a816SJohn Birrell * Use is subject to license terms.
25*2be1a816SJohn Birrell */
26*2be1a816SJohn Birrell
27*2be1a816SJohn Birrell #pragma ident "%Z%%M% %I% %E% SMI"
28*2be1a816SJohn Birrell
29*2be1a816SJohn Birrell #include <stdint.h>
30*2be1a816SJohn Birrell #include <stdlib.h>
31*2be1a816SJohn Birrell #include <strings.h>
32*2be1a816SJohn Birrell
33*2be1a816SJohn Birrell int
baz(void)34*2be1a816SJohn Birrell baz(void)
35*2be1a816SJohn Birrell {
36*2be1a816SJohn Birrell return (8);
37*2be1a816SJohn Birrell }
38*2be1a816SJohn Birrell
39*2be1a816SJohn Birrell static int
foo(void)40*2be1a816SJohn Birrell foo(void)
41*2be1a816SJohn Birrell {
42*2be1a816SJohn Birrell /*
43*2be1a816SJohn Birrell * In order to assure that our helper is properly employed to identify
44*2be1a816SJohn Birrell * the frame, we're going to trampoline through data.
45*2be1a816SJohn Birrell */
46*2be1a816SJohn Birrell uint8_t instr[] = {
47*2be1a816SJohn Birrell 0x55, /* pushl %ebp */
48*2be1a816SJohn Birrell 0x8b, 0xec, /* movl %esp, %ebp */
49*2be1a816SJohn Birrell 0xe8, 0x0, 0x0, 0x0, 0x0, /* call baz */
50*2be1a816SJohn Birrell 0x8b, 0xe5, /* movl %ebp, %esp */
51*2be1a816SJohn Birrell 0x5d, /* popl %ebp */
52*2be1a816SJohn Birrell 0xc3 /* ret */
53*2be1a816SJohn Birrell };
54*2be1a816SJohn Birrell uint8_t *fp = malloc(sizeof (instr));
55*2be1a816SJohn Birrell
56*2be1a816SJohn Birrell /*
57*2be1a816SJohn Birrell * Do our little relocation dance.
58*2be1a816SJohn Birrell */
59*2be1a816SJohn Birrell *((int *)&instr[4]) = (uintptr_t)baz - (uintptr_t)&fp[8];
60*2be1a816SJohn Birrell
61*2be1a816SJohn Birrell /*
62*2be1a816SJohn Birrell * Copy the code to the heap (it's a pain to build in ON with an
63*2be1a816SJohn Birrell * executable stack).
64*2be1a816SJohn Birrell */
65*2be1a816SJohn Birrell bcopy(instr, fp, sizeof (instr));
66*2be1a816SJohn Birrell
67*2be1a816SJohn Birrell (*(int (*)(void))fp)();
68*2be1a816SJohn Birrell
69*2be1a816SJohn Birrell free(fp);
70*2be1a816SJohn Birrell
71*2be1a816SJohn Birrell return (0);
72*2be1a816SJohn Birrell }
73*2be1a816SJohn Birrell
74*2be1a816SJohn Birrell int
main(int argc,char ** argv)75*2be1a816SJohn Birrell main(int argc, char **argv)
76*2be1a816SJohn Birrell {
77*2be1a816SJohn Birrell for (;;) {
78*2be1a816SJohn Birrell foo();
79*2be1a816SJohn Birrell }
80*2be1a816SJohn Birrell
81*2be1a816SJohn Birrell return (0);
82*2be1a816SJohn Birrell }
83