1 /* 2 * Copyright (c) 2005 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 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 16 * distribution. 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. 20 * 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 32 * SUCH DAMAGE. 33 */ 34 /* 35 * Kernel tracepoint facility. 36 */ 37 38 #include "opt_ktr.h" 39 40 #include <sys/param.h> 41 #include <sys/cons.h> 42 #include <sys/kernel.h> 43 #include <sys/libkern.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 #include <sys/ktr.h> 47 48 /* 49 * This routine fills in the ktr_caller1 and ktr_caller2 fields by 50 * tracing back through the kernel stack to locate the stack frames 51 * and return addresses. 52 * 53 * 54 * [first argument] 55 * [retpc] 56 * [frameptr] -> points to caller's frame pointer 57 * sp ->[junk] 58 */ 59 60 static __inline 61 void ** 62 FRAMEUP(void **frameptr) 63 { 64 void **newframeptr; 65 66 newframeptr = (void **)frameptr[0]; 67 if (((uintptr_t)newframeptr ^ (uintptr_t)frameptr) & ~16383) 68 newframeptr = frameptr; 69 return(newframeptr); 70 } 71 72 void 73 cpu_ktr_caller(struct ktr_entry *_ktr) 74 { 75 struct ktr_entry *ktr; 76 void **frameptr; 77 78 frameptr = (void **)&_ktr - 2; /* frame, retpc to ktr_log */ 79 ktr = _ktr; 80 frameptr = FRAMEUP(frameptr); /* frame, retpc to traced function */ 81 frameptr = FRAMEUP(frameptr); /* frame, caller1 of traced function */ 82 ktr->ktr_caller1 = frameptr[1]; 83 frameptr = FRAMEUP(frameptr); /* frame, caller2 of caller1 */ 84 ktr->ktr_caller2 = frameptr[1]; 85 } 86