/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdint.h>
#include <stdlib.h>
#include <strings.h>

int
baz(void)
{
        return (8);
}

static int
foo(void)
{
        /*
         * In order to assure that our helper is properly employed to identify
         * the frame, we're going to trampoline through data.
         */
        uint8_t instr[] = {
            0x55,                       /* pushl %ebp           */
            0x8b, 0xec,                 /* movl  %esp, %ebp     */
            0xe8, 0x0, 0x0, 0x0, 0x0,   /* call  baz            */
            0x8b, 0xe5,                 /* movl  %ebp, %esp     */
            0x5d,                       /* popl  %ebp           */
            0xc3                        /* ret                  */
        };
        uint8_t *fp = malloc(sizeof (instr));

        /*
         * Do our little relocation dance.
         */
        *((int *)&instr[4]) = (uintptr_t)baz - (uintptr_t)&fp[8];

        /*
         * Copy the code to the heap (it's a pain to build in ON with an
         * executable stack).
         */
        bcopy(instr, fp, sizeof (instr));

        (*(int (*)(void))fp)();

        free(fp);

        return (0);
}

int
main(int argc, char **argv)
{
        for (;;) {
                foo();
        }

        return (0);
}