1 /*-
2 * Copyright (c) 2015 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Semihalf under
6 * the sponsorship of the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/proc.h>
34
35 #include <machine/stack.h>
36 #include <machine/vmparam.h>
37
38 bool
unwind_frame(struct thread * td,struct unwind_state * frame)39 unwind_frame(struct thread *td, struct unwind_state *frame)
40 {
41 uintptr_t fp;
42
43 fp = frame->fp;
44
45 if (!kstack_contains(td, fp, sizeof(uintptr_t) * 2))
46 return (false);
47
48 frame->sp = fp + sizeof(uintptr_t) * 2;
49 /* FP to previous frame (X29) */
50 frame->fp = ((uintptr_t *)fp)[0];
51 /* LR (X30) */
52 frame->pc = ((uintptr_t *)fp)[1] - 4;
53
54 return (true);
55 }
56