1 /* $NetBSD: builtin.c,v 1.1 2012/05/26 22:02:29 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: builtin.c,v 1.1 2012/05/26 22:02:29 christos Exp $");
33
34 #include <sys/param.h>
35 #include <sys/types.h>
36
37 #include "execinfo.h"
38
39 #ifdef __MACHINE_STACK_GROWS_UP
40 #define BELOW >
41 #else
42 #define BELOW <
43 #endif
44
45 #ifdef __lint__
46 #define __builtin_frame_address(a) ((void *)a)
47 #endif
48
49 struct frameinfo {
50 struct frameinfo *next;
51 void *return_address;
52 };
53
54 size_t
backtrace(void ** trace,size_t len)55 backtrace(void **trace, size_t len)
56 {
57 const struct frameinfo *frame = __builtin_frame_address(0);
58 void *stack = &stack;
59
60 for (size_t i = 0; i < len; i++) {
61 if ((const void *)frame BELOW stack)
62 return i;
63 trace[i] = frame->return_address;
64 frame = frame->next;
65 }
66
67 return len;
68 }
69