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 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