stack_machdep.c revision 286133 
1/*-
2 * Copyright (c) 2015 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Andrew Turner under
6 * sponsorship from 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
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: head/sys/arm64/arm64/stack_machdep.c 286133 2015-07-31 15:32:32Z andrew $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/proc.h>
37#include <sys/stack.h>
38
39#include <machine/vmparam.h>
40#include <machine/pcb.h>
41#include <machine/stack.h>
42
43static void
44stack_capture(struct stack *st, struct unwind_state *frame)
45{
46
47	stack_zero(st);
48	while (1) {
49		unwind_frame(frame);
50		if (!INKERNEL((vm_offset_t)frame->fp) ||
51		     !INKERNEL((vm_offset_t)frame->pc))
52			break;
53		if (stack_put(st, frame->pc) == -1)
54			break;
55	}
56}
57
58void
59stack_save_td(struct stack *st, struct thread *td)
60{
61	struct unwind_state frame;
62
63	if (TD_IS_SWAPPED(td))
64		panic("stack_save_td: swapped");
65	if (TD_IS_RUNNING(td))
66		panic("stack_save_td: running");
67
68	frame.sp = td->td_pcb->pcb_sp;
69	frame.fp = td->td_pcb->pcb_x[29];
70	frame.pc = td->td_pcb->pcb_x[30];
71
72	stack_capture(st, &frame);
73}
74
75void
76stack_save(struct stack *st)
77{
78	struct unwind_state frame;
79	uint64_t sp;
80
81	__asm __volatile("mov %0, sp" : "=&r" (sp));
82
83	frame.sp = sp;
84	frame.fp = (uint64_t)__builtin_frame_address(0);
85	frame.pc = (uint64_t)stack_save;
86
87	stack_capture(st, &frame);
88}
89