2 * Copyright (c) 2005 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/cpu/i386/misc/ktr.c,v 1.1 2005/06/20 20:37:28 dillon Exp $
37 * Kernel tracepoint facility.
43 #include <sys/param.h>
45 #include <sys/kernel.h>
46 #include <sys/libkern.h>
48 #include <sys/sysctl.h>
52 * This routine fills in the ktr_caller1 and ktr_caller2 fields by
53 * tracing back through the kernel stack to locate the stack frames
54 * and return addresses.
59 * [frameptr] -> points to caller's frame pointer
65 FRAMEUP(void **frameptr)
69 newframeptr = (void **)frameptr[0];
70 if (((uintptr_t)newframeptr ^ (uintptr_t)frameptr) & ~16383)
71 newframeptr = frameptr;
76 cpu_ktr_caller(struct ktr_entry *_ktr)
78 struct ktr_entry *ktr;
81 frameptr = (void **)&_ktr - 2; /* frame, retpc to ktr_log */
83 frameptr = FRAMEUP(frameptr); /* frame, retpc to traced function */
84 frameptr = FRAMEUP(frameptr); /* frame, caller1 of traced function */
85 ktr->ktr_caller1 = frameptr[1];
86 frameptr = FRAMEUP(frameptr); /* frame, caller2 of caller1 */
87 ktr->ktr_caller2 = frameptr[1];