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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * Copyright 2016 Joyent, Inc. 26 */ 27 28 /* 29 * Handling of unintentional faults (i.e. bugs) in the debugger. 30 */ 31 32 #include <stdlib.h> 33 34 #include <kmdb/kmdb_fault.h> 35 #include <kmdb/kmdb_promif.h> 36 #include <kmdb/kmdb_kdi.h> 37 #include <kmdb/kmdb_dpi.h> 38 #include <mdb/mdb_debug.h> 39 #include <mdb/mdb_kreg.h> 40 #include <mdb/mdb_io_impl.h> 41 #include <mdb/mdb.h> 42 43 void 44 kmdb_fault(kreg_t tt, kreg_t pc, kreg_t sp, int cpuid) 45 { 46 int debug_self_confirm = 0; 47 volatile int 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 #ifndef sun4v 82 "(o)bp, " 83 #endif /* sun4v */ 84 "(p)anic" 85 #else 86 "reboo(t)" 87 #endif 88 ", or (d)ebug with self? ", mdb.m_pname); 89 mdb_iob_flush(mdb.m_err); 90 91 if (IOP_READ(mdb.m_term, &c, sizeof (c)) != sizeof (c)) 92 goto fault_obp; 93 94 mdb_iob_printf(mdb.m_err, "\n"); 95 96 switch (c) { 97 #ifdef __sparc 98 case 'p': 99 kmdb_dpi_kernpanic(cpuid); 100 /*NOTREACHED*/ 101 continue; 102 #endif 103 104 #ifndef sun4v 105 case 'o': 106 case 'O': 107 #endif /* sun4v */ 108 case 't': 109 case 'T': 110 kmdb_dpi_enter_mon(); 111 continue; 112 113 case 'd': 114 case 'D': 115 /* 116 * Debug self - get confirmation, because they 117 * can't go back to their running system if 118 * they choose this one. 119 */ 120 if (debug_self_confirm == 0) { 121 mdb_iob_printf(mdb.m_err, 122 "NOTE: You will not be able to " 123 "resume your system if you " 124 "choose this option.\nPlease " 125 "select 'd' again to confirm.\n"); 126 debug_self_confirm = 1; 127 continue; 128 } 129 130 kmdb_dpi_set_state(DPI_STATE_LOST, 0); 131 return; 132 } 133 } 134 } 135 136 fault_obp: 137 exit(1); 138 /*NOTREACHED*/ 139 } 140