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: releng/7.4/sys/powerpc/powerpc/stack_machdep.c 178079 2008-04-10 22:09:25Z rwatson $");
29
30 #include <sys/param.h>
31 #include <sys/proc.h>
32 #include <sys/stack.h>
33 #include <sys/systm.h>
34
35 #include <vm/vm.h>
36 #include <vm/pmap.h>
37 #include <vm/vm_extern.h>
38
39 #include <machine/db_machdep.h>
40 #include <machine/pcb.h>
41 #include <machine/spr.h>
42 #include <machine/stack.h>
43 #include <machine/trap.h>
44
45 static void
46 stack_capture(struct stack *st, register_t frame)
47 {
48 vm_offset_t callpc;
49
50 stack_zero(st);
51 if (frame < PAGE_SIZE)
52 return;
53 while (1) {
54 frame = *(register_t *)frame;
55 if (frame < PAGE_SIZE)
56 break;
57 callpc = *(vm_offset_t *)(frame + 4) - 4;
58 if ((callpc & 3) || (callpc < 0x100))
59 break;
60
61 /*
62 * Don't bother traversing trap-frames - there should
63 * be enough info down to the frame to work out where
64 * things are going wrong. Plus, prevents this shortened
65 * version of code from accessing user-space frames
66 */
67 if (callpc + 4 == (register_t) &trapexit ||
68 callpc + 4 == (register_t) &asttrapexit)
69 break;
70
71 if (stack_put(st, callpc) == -1)
72 break;
73 }
74 }
75
76 void
77 stack_save_td(struct stack *st, struct thread *td)
78 {
79 register_t frame;
80
81 if (TD_IS_SWAPPED(td))
82 panic("stack_save_td: swapped");
83 if (TD_IS_RUNNING(td))
84 panic("stack_save_td: running");
85
86 frame = td->td_pcb->pcb_sp;
87 stack_capture(st, frame);
88 }
89
90 void
91 stack_save(struct stack *st)
92 {
93 register_t frame;
94
95 frame = (register_t)__builtin_frame_address(1);
96 stack_capture(st, frame);
97 }
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