1 /* $NetBSD: kgdb_machdep.c,v 1.7 2009/01/11 23:20:37 cegger Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * All advertising materials mentioning features or use of this software 12 * must display the following acknowledgement: 13 * This product includes software developed by the University of 14 * California, Lawrence Berkeley Laboratories. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94 41 */ 42 43 /* 44 * Machine-dependent part of the KGDB remote "stub" 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.7 2009/01/11 23:20:37 cegger Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/kgdb.h> 53 54 #define INVOKE_KGDB() __asm volatile("trap #15") 55 56 /* 57 * Determine if the memory at va..(va+len) is valid. 58 */ 59 int 60 kgdb_acc(vaddr_t va, size_t ulen) 61 { 62 63 /* Just let the trap handler deal with it. */ 64 return 1; 65 } 66 67 /* 68 * Trap into kgdb to wait for debugger to connect, 69 * noting on the console why nothing else is going on. 70 */ 71 void 72 kgdb_connect(int verbose) 73 { 74 75 if (kgdb_dev == NODEV) 76 return; 77 78 if (verbose) 79 printf("kgdb waiting..."); 80 81 INVOKE_KGDB(); 82 83 if (verbose) 84 printf("connected.\n"); 85 86 kgdb_debug_panic = 1; 87 } 88 89 /* 90 * Decide what to do on panic. 91 */ 92 void 93 kgdb_panic(void) 94 { 95 if (kgdb_dev != NODEV && kgdb_debug_panic) { 96 printf("entering kgdb\n"); 97 kgdb_connect(kgdb_active == 0); 98 } 99 } 100