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
42 static void
43 stack_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
66 void
67 stack_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
80 void
81 stack_save(struct stack *st)
82 {
83 register_t ebp;
84
85 __asm __volatile("movl %%ebp,%0" : "=r" (ebp));
86 stack_capture(st, ebp);
87 }
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