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 * Intel-specific portions of the debugger fault routines 31 */ 32 33 #include <sys/types.h> 34 #include <sys/stack.h> 35 #include <sys/frame.h> 36 37 #include <kmdb/kmdb_fault.h> 38 #include <kmdb/kmdb_asmutil.h> 39 #include <mdb/mdb_kreg.h> 40 #include <mdb/mdb.h> 41 42 #define MAX_STACK_FRAMES 30 43 44 static void 45 print_frame(uintptr_t pc, int fnum, int safe) 46 { 47 if (safe) { 48 /* 49 * We exploded the first time around, so we want to try again, 50 * this time without symbol names 51 */ 52 mdb_iob_printf(mdb.m_err, " [%2d] %?p()\n", fnum, pc); 53 } else { 54 mdb_iob_printf(mdb.m_err, " [%2d] %?p %A()\n", fnum, pc, pc); 55 } 56 } 57 58 static int 59 valid_frame(struct frame *fr) 60 { 61 uintptr_t addr = (uintptr_t)fr; 62 63 if (addr & (STACK_ALIGN - 1)) { 64 mdb_iob_printf(mdb.m_err, " mis-aligned frame (%p)\n", fr); 65 return (0); 66 } 67 68 return (1); 69 } 70 71 static void 72 print_stack(kreg_t sp, int safe) 73 { 74 struct frame *fr = (struct frame *)sp; 75 int frnum = 1; 76 77 while (fr != NULL && valid_frame(fr) && fr->fr_savpc != 0 && 78 frnum < MAX_STACK_FRAMES) { 79 print_frame(fr->fr_savpc, frnum, safe); 80 81 fr = (struct frame *)fr->fr_savfp; 82 frnum++; 83 } 84 } 85 86 void 87 kmdb_print_stack(void) 88 { 89 print_stack(get_fp(), FALSE); /* show sym names */ 90 } 91 92 void 93 kmdb_fault_display(kreg_t trapno, kreg_t pc, kreg_t sp, int safe) 94 { 95 mdb_iob_printf(mdb.m_err, " trapno: %d, sp: %p, pc: %p", trapno, 96 sp, pc); 97 if (!safe) 98 mdb_iob_printf(mdb.m_err, " %A", pc); 99 mdb_iob_printf(mdb.m_err, "\n\n"); 100 101 if (mdb.m_dseg == NULL || mdb.m_dsegsz == 0) { 102 mdb_iob_printf(mdb.m_err, 103 "\t*** Stack trace omitted because debugger segment size\n" 104 "\t*** and/or length not set.\n"); 105 return; 106 } 107 108 if (!(sp - (uintptr_t)mdb.m_dseg < mdb.m_dsegsz)) { 109 mdb_iob_printf(mdb.m_err, 110 "\t*** Stack trace omitted because sp (%p) isn't in the\n" 111 "\t*** debugger segment.\n", sp); 112 return; 113 } 114 115 /* 116 * We were on a kmdb stack when we took this fault. We're going to 117 * assume that there's nothing weird on the stack, and that, therefore, 118 * we can use a simple algorithm to dump it. 119 */ 120 121 print_stack(sp, safe); 122 } 123