1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * Handling of unintentional faults (i.e. bugs) in the debugger. 31 */ 32 33 #include <stdlib.h> 34 35 #include <kmdb/kmdb_fault.h> 36 #include <kmdb/kmdb_promif.h> 37 #include <kmdb/kmdb_kdi.h> 38 #include <kmdb/kmdb_dpi.h> 39 #include <mdb/mdb_debug.h> 40 #include <mdb/mdb_kreg.h> 41 #include <mdb/mdb_io_impl.h> 42 #include <mdb/mdb.h> 43 44 void 45 kmdb_fault(kreg_t tt, kreg_t pc, kreg_t sp, int cpuid) 46 { 47 int debug_self_confirm = 0, try; 48 jmp_buf pcb, *old; 49 char c; 50 51 /* Make absolutely sure */ 52 kmdb_kdi_system_claim(); 53 54 try = 1; 55 if (setjmp(pcb) != 0) { 56 if (++try == 2) { 57 mdb_iob_printf(mdb.m_err, 58 "\n*** First stack trace attempt failed. " 59 "Trying safe mode.\n\n"); 60 61 kmdb_fault_display(tt, pc, sp, 1); 62 } else { 63 mdb_iob_printf(mdb.m_err, 64 "\n*** Unable to print stack trace.\n"); 65 } 66 67 } else { 68 old = kmdb_dpi_set_fault_hdlr(&pcb); 69 70 mdb_iob_printf(mdb.m_err, "\n*** Debugger Fault (CPU %d)\n\n", 71 cpuid); 72 kmdb_fault_display(tt, pc, sp, 0); 73 } 74 75 kmdb_dpi_restore_fault_hdlr(old); 76 77 if (mdb.m_term != NULL) { 78 for (;;) { 79 mdb_iob_printf(mdb.m_err, "\n%s: " 80 #if defined(__sparc) 81 "(o)bp, (p)anic" 82 #else 83 "reboo(t)" 84 #endif 85 ", or (d)ebug with self? ", mdb.m_pname); 86 mdb_iob_flush(mdb.m_err); 87 88 if (IOP_READ(mdb.m_term, &c, sizeof (c)) != sizeof (c)) 89 goto fault_obp; 90 91 mdb_iob_printf(mdb.m_err, "\n"); 92 93 switch (c) { 94 #ifdef __sparc 95 case 'p': 96 kmdb_dpi_kernpanic(cpuid); 97 /*NOTREACHED*/ 98 continue; 99 #endif 100 101 case 'o': 102 case 'O': 103 case 't': 104 case 'T': 105 kmdb_dpi_enter_mon(); 106 continue; 107 108 case 'd': 109 case 'D': 110 /* 111 * Debug self - get confirmation, because they 112 * can't go back to their running system if 113 * they choose this one. 114 */ 115 if (debug_self_confirm == 0) { 116 mdb_iob_printf(mdb.m_err, 117 "NOTE: You will not be able to " 118 "resume your system if you " 119 "choose this option.\nPlease " 120 "select 'd' again to confirm.\n"); 121 debug_self_confirm = 1; 122 continue; 123 } 124 125 kmdb_dpi_set_state(DPI_STATE_LOST, 0); 126 return; 127 } 128 } 129 } 130 131 fault_obp: 132 exit(1); 133 /*NOTREACHED*/ 134 } 135