1284257Sbr/*-
2284257Sbr * Copyright (c) 2015 The FreeBSD Foundation
3284257Sbr * All rights reserved.
4284257Sbr *
5284257Sbr * This software was developed by Semihalf under
6284257Sbr * the sponsorship of the FreeBSD Foundation.
7284257Sbr *
8284257Sbr * Redistribution and use in source and binary forms, with or without
9284257Sbr * modification, are permitted provided that the following conditions
10284257Sbr * are met:
11284257Sbr * 1. Redistributions of source code must retain the above copyright
12284257Sbr *    notice, this list of conditions and the following disclaimer.
13284257Sbr * 2. Redistributions in binary form must reproduce the above copyright
14284257Sbr *    notice, this list of conditions and the following disclaimer in the
15284257Sbr *    documentation and/or other materials provided with the distribution.
16284257Sbr *
17284257Sbr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18284257Sbr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19284257Sbr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20284257Sbr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21284257Sbr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22284257Sbr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23284257Sbr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24284257Sbr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25284257Sbr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26284257Sbr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27284257Sbr * SUCH DAMAGE.
28284257Sbr */
29284257Sbr
30284257Sbr#include <sys/cdefs.h>
31284257Sbr__FBSDID("$FreeBSD$");
32284257Sbr#include <sys/param.h>
33284257Sbr
34284257Sbr#include <machine/stack.h>
35287113Sandrew#include <machine/vmparam.h>
36284257Sbr
37284257Sbrint
38284257Sbrunwind_frame(struct unwind_state *frame)
39284257Sbr{
40284257Sbr	uint64_t fp;
41284257Sbr
42284257Sbr	fp = frame->fp;
43287113Sandrew	if (!INKERNEL(fp))
44284257Sbr		return (-1);
45284257Sbr
46284257Sbr	frame->sp = fp + 0x10;
47284257Sbr	/* FP to previous frame (X29) */
48284257Sbr	frame->fp = *(uint64_t *)(fp);
49284257Sbr	/* LR (X30) */
50284257Sbr	frame->pc = *(uint64_t *)(fp + 8) - 4;
51284257Sbr
52284257Sbr	return (0);
53284257Sbr}
54