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 /* 28 * Intel-specific portions of the debugger fault routines 29 */ 30 31 #include <sys/types.h> 32 #include <sys/stack.h> 33 #include <sys/frame.h> 34 35 #include <kmdb/kmdb_fault.h> 36 #include <kmdb/kmdb_asmutil.h> 37 #include <mdb/mdb_kreg.h> 38 #include <mdb/mdb.h> 39 40 #define MAX_STACK_FRAMES 30 41 42 static void 43 print_frame(uintptr_t pc, int fnum, int safe) 44 { 45 if (safe) { 46 /* 47 * We exploded the first time around, so we want to try again, 48 * this time without symbol names 49 */ 50 mdb_iob_printf(mdb.m_err, " [%2d] %?p()\n", fnum, pc); 51 } else { 52 mdb_iob_printf(mdb.m_err, " [%2d] %?p %A()\n", fnum, pc, pc); 53 } 54 } 55 56 static int 57 valid_frame(struct frame *fr) 58 { 59 uintptr_t addr = (uintptr_t)fr; 60 61 if (addr & (STACK_ALIGN - 1)) { 62 mdb_iob_printf(mdb.m_err, " mis-aligned frame (%p)\n", fr); 63 return (0); 64 } 65 66 return (1); 67 } 68 69 static void 70 print_stack(kreg_t sp, int safe) 71 { 72 struct frame *fr = (struct frame *)sp; 73 int frnum = 1; 74 75 while (fr != NULL && valid_frame(fr) && fr->fr_savpc != 0 && 76 frnum < MAX_STACK_FRAMES) { 77 print_frame(fr->fr_savpc, frnum, safe); 78 79 fr = (struct frame *)fr->fr_savfp; 80 frnum++; 81 } 82 } 83 84 void 85 kmdb_print_stack(void) 86 { 87 print_stack(get_fp(), FALSE); /* show sym names */ 88 } 89 90 void 91 kmdb_fault_display(kreg_t trapno, kreg_t pc, kreg_t sp, int safe) 92 { 93 mdb_iob_printf(mdb.m_err, " trapno: %d, sp: %p, pc: %p", trapno, 94 sp, pc); 95 if (!safe) 96 mdb_iob_printf(mdb.m_err, " %A", pc); 97 mdb_iob_printf(mdb.m_err, "\n\n"); 98 99 if (mdb.m_dseg == NULL || mdb.m_dsegsz == 0) { 100 mdb_iob_printf(mdb.m_err, 101 "\t*** Stack trace omitted because debugger segment size\n" 102 "\t*** and/or length not set.\n"); 103 return; 104 } 105 106 if (!(sp - (uintptr_t)mdb.m_dseg < mdb.m_dsegsz)) { 107 mdb_iob_printf(mdb.m_err, 108 "\t*** Stack trace omitted because sp (%p) isn't in the\n" 109 "\t*** debugger segment.\n", sp); 110 return; 111 } 112 113 /* 114 * We were on a kmdb stack when we took this fault. We're going to 115 * assume that there's nothing weird on the stack, and that, therefore, 116 * we can use a simple algorithm to dump it. 117 */ 118 119 print_stack(sp, safe); 120 } 121