stack_machdep.c revision 287643 
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: head/sys/x86/x86/stack_machdep.c 287643 2015-09-11 03:24:07Z markj $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/proc.h>
33#include <sys/stack.h>
34
35#include <x86/stack.h>
36
37#include <machine/pcb.h>
38
39#include <vm/vm.h>
40#include <vm/vm_param.h>
41#include <vm/pmap.h>
42
43#ifdef __i386__
44#define	PCB_FP(pcb)	((pcb)->pcb_ebp)
45#define	TF_FP(tf)	((tf)->tf_ebp)
46#define	TF_PC(tf)	((tf)->tf_eip)
47
48typedef struct i386_frame *x86_frame_t;
49#else
50#define	PCB_FP(pcb)	((pcb)->pcb_rbp)
51#define	TF_FP(tf)	((tf)->tf_rbp)
52#define	TF_PC(tf)	((tf)->tf_rip)
53
54typedef struct amd64_frame *x86_frame_t;
55#endif
56
57static void
58stack_capture(struct thread *td, struct stack *st, register_t fp)
59{
60	x86_frame_t frame;
61	vm_offset_t callpc;
62
63	stack_zero(st);
64	frame = (x86_frame_t)fp;
65	while (1) {
66		if (!INKERNEL((long)frame))
67			break;
68		callpc = frame->f_retaddr;
69		if (!INKERNEL(callpc))
70			break;
71		if (stack_put(st, callpc) == -1)
72			break;
73		if (frame->f_frame <= frame ||
74		    (vm_offset_t)frame->f_frame >= td->td_kstack +
75		    td->td_kstack_pages * PAGE_SIZE)
76			break;
77		frame = frame->f_frame;
78	}
79}
80
81void
82stack_save_td(struct stack *st, struct thread *td)
83{
84
85	if (TD_IS_SWAPPED(td))
86		panic("stack_save_td: swapped");
87	if (TD_IS_RUNNING(td))
88		panic("stack_save_td: running");
89
90	stack_capture(td, st, PCB_FP(td->td_pcb));
91}
92
93void
94stack_save(struct stack *st)
95{
96	register_t fp;
97
98#ifdef __i386__
99	__asm __volatile("movl %%ebp,%0" : "=g" (fp));
100#else
101	__asm __volatile("movq %%rbp,%0" : "=g" (fp));
102#endif
103	stack_capture(curthread, st, fp);
104}
105