1/*-
2 * Copyright (c) 2015 The FreeBSD Foundation
3 *
4 * This software was developed by Andrew Turner under
5 * sponsorship from the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/lock.h>
33#include <sys/mutex.h>
34#include <sys/proc.h>
35#include <sys/stack.h>
36
37#include <machine/vmparam.h>
38#include <machine/pcb.h>
39#include <machine/stack.h>
40
41static void
42stack_capture(struct thread *td, struct stack *st, struct unwind_state *frame)
43{
44
45	stack_zero(st);
46	while (1) {
47		if (!unwind_frame(td, frame))
48			break;
49		if (!INKERNEL((vm_offset_t)frame->pc))
50			break;
51		if (stack_put(st, frame->pc) == -1)
52			break;
53	}
54}
55
56int
57stack_save_td(struct stack *st, struct thread *td)
58{
59	struct unwind_state frame;
60
61	THREAD_LOCK_ASSERT(td, MA_OWNED);
62	KASSERT(!TD_IS_SWAPPED(td),
63	    ("stack_save_td: thread %p is swapped", td));
64
65	if (TD_IS_RUNNING(td))
66		return (EOPNOTSUPP);
67
68	frame.fp = td->td_pcb->pcb_x[PCB_FP];
69	frame.pc = ADDR_MAKE_CANONICAL(td->td_pcb->pcb_x[PCB_LR]);
70
71	stack_capture(td, st, &frame);
72	return (0);
73}
74
75void
76stack_save(struct stack *st)
77{
78	struct unwind_state frame;
79
80	frame.fp = (uintptr_t)__builtin_frame_address(0);
81	frame.pc = (uintptr_t)stack_save;
82
83	stack_capture(curthread, st, &frame);
84}
85