subr_debug.c revision 1.2.4.4
1 1.2.4.4 yamt /* $NetBSD: subr_debug.c,v 1.2.4.4 2007/10/27 11:35:32 yamt Exp $ */ 2 1.2.4.2 yamt 3 1.2.4.2 yamt /*- 4 1.2.4.2 yamt * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 1.2.4.2 yamt * All rights reserved. 6 1.2.4.2 yamt * 7 1.2.4.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.4.2 yamt * by Andrew Doran. 9 1.2.4.2 yamt * 10 1.2.4.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.4.2 yamt * modification, are permitted provided that the following conditions 12 1.2.4.2 yamt * are met: 13 1.2.4.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.4.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.4.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.4.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.4.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.4.2 yamt * 3. All advertising materials mentioning features or use of this software 19 1.2.4.2 yamt * must display the following acknowledgement: 20 1.2.4.2 yamt * This product includes software developed by the NetBSD 21 1.2.4.2 yamt * Foundation, Inc. and its contributors. 22 1.2.4.2 yamt * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.4.2 yamt * contributors may be used to endorse or promote products derived 24 1.2.4.2 yamt * from this software without specific prior written permission. 25 1.2.4.2 yamt * 26 1.2.4.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.4.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.4.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.4.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.4.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.4.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.4.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.4.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.4.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.4.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.4.2 yamt * POSSIBILITY OF SUCH DAMAGE. 37 1.2.4.2 yamt */ 38 1.2.4.2 yamt 39 1.2.4.2 yamt /* 40 1.2.4.2 yamt * Shared support code for kernels built with the DEBUG option. 41 1.2.4.2 yamt */ 42 1.2.4.2 yamt 43 1.2.4.2 yamt #include <sys/cdefs.h> 44 1.2.4.4 yamt __KERNEL_RCSID(0, "$NetBSD: subr_debug.c,v 1.2.4.4 2007/10/27 11:35:32 yamt Exp $"); 45 1.2.4.2 yamt 46 1.2.4.2 yamt #include "opt_ddb.h" 47 1.2.4.2 yamt 48 1.2.4.2 yamt #include <sys/param.h> 49 1.2.4.2 yamt #include <sys/proc.h> 50 1.2.4.2 yamt #include <sys/systm.h> 51 1.2.4.2 yamt #include <sys/kmem.h> 52 1.2.4.2 yamt #include <sys/debug.h> 53 1.2.4.2 yamt 54 1.2.4.2 yamt #include <uvm/uvm_extern.h> 55 1.2.4.2 yamt 56 1.2.4.2 yamt #include <machine/lock.h> 57 1.2.4.4 yamt #include <sys/cpu.h> 58 1.2.4.2 yamt 59 1.2.4.2 yamt /* 60 1.2.4.2 yamt * Allocation/free validation by pointer address. Introduces 61 1.2.4.2 yamt * significant overhead and is not enabled by default. Patch 62 1.2.4.2 yamt * `debug_freecheck' to 1 at boot time to enable. 63 1.2.4.2 yamt */ 64 1.2.4.2 yamt #define FREECHECK_BYTES (8*1024*1024) 65 1.2.4.2 yamt 66 1.2.4.2 yamt typedef struct fcitem { 67 1.2.4.2 yamt void *i_addr; 68 1.2.4.2 yamt struct fcitem *i_next; 69 1.2.4.2 yamt } fcitem_t; 70 1.2.4.2 yamt 71 1.2.4.2 yamt fcitem_t *freecheck_free; 72 1.2.4.2 yamt __cpu_simple_lock_t freecheck_lock; 73 1.2.4.2 yamt int debug_freecheck; 74 1.2.4.2 yamt 75 1.2.4.2 yamt void 76 1.2.4.2 yamt debug_init(void) 77 1.2.4.2 yamt { 78 1.2.4.2 yamt size_t cnt; 79 1.2.4.2 yamt fcitem_t *i; 80 1.2.4.2 yamt 81 1.2.4.2 yamt __cpu_simple_lock_init(&freecheck_lock); 82 1.2.4.2 yamt 83 1.2.4.2 yamt if (debug_freecheck) { 84 1.2.4.2 yamt i = (fcitem_t *)uvm_km_alloc(kernel_map, FREECHECK_BYTES, 0, 85 1.2.4.2 yamt UVM_KMF_WIRED); 86 1.2.4.2 yamt if (i == NULL) { 87 1.2.4.2 yamt printf("freecheck_init: unable to allocate memory"); 88 1.2.4.2 yamt return; 89 1.2.4.2 yamt } 90 1.2.4.2 yamt 91 1.2.4.2 yamt for (cnt = FREECHECK_BYTES / sizeof(*i); cnt != 0; cnt--) { 92 1.2.4.2 yamt i->i_next = freecheck_free; 93 1.2.4.2 yamt freecheck_free = i++; 94 1.2.4.2 yamt } 95 1.2.4.2 yamt } 96 1.2.4.2 yamt } 97 1.2.4.2 yamt 98 1.2.4.2 yamt void 99 1.2.4.2 yamt freecheck_out(void **head, void *addr) 100 1.2.4.2 yamt { 101 1.2.4.2 yamt fcitem_t *i; 102 1.2.4.2 yamt int s; 103 1.2.4.2 yamt 104 1.2.4.2 yamt if (!debug_freecheck) 105 1.2.4.2 yamt return; 106 1.2.4.2 yamt 107 1.2.4.2 yamt s = splvm(); 108 1.2.4.2 yamt __cpu_simple_lock(&freecheck_lock); 109 1.2.4.3 yamt for (i = *head; i != NULL; i = i->i_next) { 110 1.2.4.3 yamt if (i->i_addr != addr) 111 1.2.4.3 yamt continue; 112 1.2.4.3 yamt __cpu_simple_unlock(&freecheck_lock); 113 1.2.4.3 yamt splx(s); 114 1.2.4.3 yamt panic("freecheck_out: %p already out", addr); 115 1.2.4.3 yamt } 116 1.2.4.2 yamt if ((i = freecheck_free) != NULL) { 117 1.2.4.2 yamt freecheck_free = i->i_next; 118 1.2.4.2 yamt i->i_addr = addr; 119 1.2.4.2 yamt i->i_next = *head; 120 1.2.4.2 yamt *head = i; 121 1.2.4.2 yamt } 122 1.2.4.2 yamt __cpu_simple_unlock(&freecheck_lock); 123 1.2.4.2 yamt splx(s); 124 1.2.4.2 yamt 125 1.2.4.2 yamt if (i == NULL) { 126 1.2.4.2 yamt printf("freecheck_out: no more slots"); 127 1.2.4.2 yamt debug_freecheck = 0; 128 1.2.4.2 yamt } 129 1.2.4.2 yamt } 130 1.2.4.2 yamt 131 1.2.4.2 yamt void 132 1.2.4.2 yamt freecheck_in(void **head, void *addr) 133 1.2.4.2 yamt { 134 1.2.4.2 yamt fcitem_t *i; 135 1.2.4.2 yamt void *pp; 136 1.2.4.2 yamt int s; 137 1.2.4.2 yamt 138 1.2.4.2 yamt if (!debug_freecheck) 139 1.2.4.2 yamt return; 140 1.2.4.2 yamt 141 1.2.4.2 yamt s = splvm(); 142 1.2.4.2 yamt __cpu_simple_lock(&freecheck_lock); 143 1.2.4.2 yamt for (i = *head, pp = head; i != NULL; pp = &i->i_next, i = i->i_next) { 144 1.2.4.2 yamt if (i->i_addr == addr) { 145 1.2.4.2 yamt *(fcitem_t **)pp = i->i_next; 146 1.2.4.2 yamt i->i_next = freecheck_free; 147 1.2.4.2 yamt freecheck_free = i; 148 1.2.4.2 yamt break; 149 1.2.4.2 yamt } 150 1.2.4.2 yamt } 151 1.2.4.2 yamt __cpu_simple_unlock(&freecheck_lock); 152 1.2.4.2 yamt splx(s); 153 1.2.4.2 yamt 154 1.2.4.2 yamt if (i != NULL) 155 1.2.4.2 yamt return; 156 1.2.4.2 yamt 157 1.2.4.2 yamt #ifdef DDB 158 1.2.4.2 yamt printf("freecheck_in: %p not out", addr); 159 1.2.4.2 yamt Debugger(); 160 1.2.4.2 yamt #else 161 1.2.4.2 yamt panic("freecheck_in: %p not out", addr); 162 1.2.4.2 yamt #endif 163 1.2.4.2 yamt } 164
Indexes created Mon Sep 22 13:09:51 GMT 2025