1/*-
2 * Copyright (c) 2005 Antoine Brodin
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/proc.h>
33#include <sys/stack.h>
34
35#include <machine/pcb.h>
36#include <machine/stack.h>
37
38#include <vm/vm.h>
39#include <vm/vm_param.h>
40#include <vm/pmap.h>
41
42static void
43stack_capture(struct stack *st, register_t ebp)
44{
45	struct i386_frame *frame;
46	vm_offset_t callpc;
47
48	stack_zero(st);
49	frame = (struct i386_frame *)ebp;
50	while (1) {
51		if (!INKERNEL(frame))
52			break;
53		callpc = frame->f_retaddr;
54		if (!INKERNEL(callpc))
55			break;
56		if (stack_put(st, callpc) == -1)
57			break;
58		if (frame->f_frame <= frame ||
59		    (vm_offset_t)frame->f_frame >=
60		    (vm_offset_t)ebp + KSTACK_PAGES * PAGE_SIZE)
61			break;
62		frame = frame->f_frame;
63	}
64}
65
66void
67stack_save_td(struct stack *st, struct thread *td)
68{
69	register_t ebp;
70
71	if (TD_IS_SWAPPED(td))
72		panic("stack_save_td: swapped");
73	if (TD_IS_RUNNING(td))
74		panic("stack_save_td: running");
75
76	ebp = td->td_pcb->pcb_ebp;
77	stack_capture(st, ebp);
78}
79
80void
81stack_save(struct stack *st)
82{
83	register_t ebp;
84
85	__asm __volatile("movl %%ebp,%0" : "=r" (ebp));
86	stack_capture(st, ebp);
87}
88