xref: /src/tests/kernel/h_execsp.c

/*	$NetBSD: h_execsp.c,v 1.1 2025/04/20 22:31:00 riastradh Exp $	*/

/*-
 * Copyright (c) 2025 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: h_execsp.c,v 1.1 2025/04/20 22:31:00 riastradh Exp $");

#include <err.h>
#include <string.h>
#include <unistd.h>

#include "h_execsp.h"

/*
 * The machine-dependent execsp.S assembly routines will initialize
 * startsp and mainsp and then call execsp_main on program startup.
 */
void *startsp;
void *mainsp;

int execsp_main(void);
int
execsp_main(void)
{
	struct execsp execsp;
	ssize_t nwrit;

	memset(&execsp, 0, sizeof(execsp));
	execsp.startsp = startsp;
	execsp.mainsp = mainsp;

	nwrit = write(STDOUT_FILENO, &execsp, sizeof(execsp));
	if (nwrit == -1)
		err(1, "write");
	if ((size_t)nwrit != sizeof(execsp))
		errx(1, "wrote %zu != %zu", (size_t)nwrit, sizeof(execsp));

	return 0;
}