1174195Srwatson/*-
2174195Srwatson * Copyright (c) 2005 Antoine Brodin
3174195Srwatson * All rights reserved.
4174195Srwatson *
5174195Srwatson * Redistribution and use in source and binary forms, with or without
6174195Srwatson * modification, are permitted provided that the following conditions
7174195Srwatson * are met:
8174195Srwatson * 1. Redistributions of source code must retain the above copyright
9174195Srwatson *    notice, this list of conditions and the following disclaimer.
10174195Srwatson * 2. Redistributions in binary form must reproduce the above copyright
11174195Srwatson *    notice, this list of conditions and the following disclaimer in the
12174195Srwatson *    documentation and/or other materials provided with the distribution.
13174195Srwatson *
14174195Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15174195Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16174195Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17174195Srwatson * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18174195Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19174195Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20174195Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21174195Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22174195Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23174195Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24174195Srwatson * SUCH DAMAGE.
25174195Srwatson */
26174195Srwatson
27174195Srwatson#include <sys/cdefs.h>
28174195Srwatson__FBSDID("$FreeBSD$");
29174195Srwatson
30174195Srwatson#include <sys/param.h>
31174195Srwatson#include <sys/proc.h>
32174195Srwatson#include <sys/stack.h>
33174195Srwatson#include <sys/systm.h>
34174195Srwatson
35174195Srwatson#include <vm/vm.h>
36174195Srwatson#include <vm/pmap.h>
37174195Srwatson#include <vm/vm_extern.h>
38174195Srwatson
39174195Srwatson#include <machine/db_machdep.h>
40174195Srwatson#include <machine/pcb.h>
41174195Srwatson#include <machine/spr.h>
42174195Srwatson#include <machine/stack.h>
43174195Srwatson#include <machine/trap.h>
44174195Srwatson
45209975Snwhitehorn#ifdef __powerpc64__
46209975Snwhitehorn#define CALLOFFSET 8 /* Account for the TOC reload slot */
47209975Snwhitehorn#else
48209975Snwhitehorn#define CALLOFFSET 4
49209975Snwhitehorn#endif
50209975Snwhitehorn
51174195Srwatsonstatic void
52198678Snwhitehornstack_capture(struct stack *st, vm_offset_t frame)
53174195Srwatson{
54174195Srwatson	vm_offset_t callpc;
55174195Srwatson
56174195Srwatson	stack_zero(st);
57174195Srwatson	if (frame < PAGE_SIZE)
58174195Srwatson		return;
59174195Srwatson	while (1) {
60209975Snwhitehorn		frame = *(vm_offset_t *)frame;
61174195Srwatson		if (frame < PAGE_SIZE)
62174195Srwatson			break;
63209975Snwhitehorn
64209975Snwhitehorn	    #ifdef __powerpc64__
65209975Snwhitehorn		callpc = *(vm_offset_t *)(frame + 16) - 4;
66209975Snwhitehorn	    #else
67174195Srwatson		callpc = *(vm_offset_t *)(frame + 4) - 4;
68209975Snwhitehorn	    #endif
69174195Srwatson		if ((callpc & 3) || (callpc < 0x100))
70174195Srwatson			break;
71174195Srwatson
72174195Srwatson		/*
73174195Srwatson		 * Don't bother traversing trap-frames - there should
74174195Srwatson		 * be enough info down to the frame to work out where
75174195Srwatson		 * things are going wrong. Plus, prevents this shortened
76174195Srwatson		 * version of code from accessing user-space frames
77174195Srwatson		 */
78209975Snwhitehorn		if (callpc + CALLOFFSET == (vm_offset_t) &trapexit ||
79209975Snwhitehorn		    callpc + CALLOFFSET == (vm_offset_t) &asttrapexit)
80174195Srwatson			break;
81174195Srwatson
82174195Srwatson		if (stack_put(st, callpc) == -1)
83174195Srwatson			break;
84174195Srwatson	}
85174195Srwatson}
86174195Srwatson
87174195Srwatsonvoid
88174195Srwatsonstack_save_td(struct stack *st, struct thread *td)
89174195Srwatson{
90198678Snwhitehorn	vm_offset_t frame;
91174195Srwatson
92174195Srwatson	if (TD_IS_SWAPPED(td))
93174195Srwatson		panic("stack_save_td: swapped");
94174195Srwatson	if (TD_IS_RUNNING(td))
95174195Srwatson		panic("stack_save_td: running");
96174195Srwatson
97174195Srwatson	frame = td->td_pcb->pcb_sp;
98174195Srwatson	stack_capture(st, frame);
99174195Srwatson}
100174195Srwatson
101174195Srwatsonvoid
102174195Srwatsonstack_save(struct stack *st)
103174195Srwatson{
104174195Srwatson	register_t frame;
105174195Srwatson
106174195Srwatson	frame = (register_t)__builtin_frame_address(1);
107174195Srwatson	stack_capture(st, frame);
108174195Srwatson}
109