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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Failure routines for libumem (not standalone) 29 */ 30 31 #include <sys/types.h> 32 #include <signal.h> 33 #include <stdarg.h> 34 #include <string.h> 35 36 #include "misc.h" 37 38 static volatile int umem_exiting = 0; 39 #define UMEM_EXIT_ABORT 1 40 41 static mutex_t umem_exit_lock = DEFAULTMUTEX; /* protects umem_exiting */ 42 43 static int 44 firstexit(int type) 45 { 46 if (umem_exiting) 47 return (0); 48 49 (void) mutex_lock(&umem_exit_lock); 50 if (umem_exiting) { 51 (void) mutex_unlock(&umem_exit_lock); 52 return (0); 53 } 54 umem_exiting = type; 55 (void) mutex_unlock(&umem_exit_lock); 56 57 return (1); 58 } 59 60 /* 61 * We can't use abort(3C), since it closes all of the standard library 62 * FILEs, which can call free(). 63 * 64 * In addition, we can't just raise(SIGABRT), since the current handler 65 * might do allocation. We give them once chance, though. 66 */ 67 static void __NORETURN 68 umem_do_abort(void) 69 { 70 if (firstexit(UMEM_EXIT_ABORT)) 71 (void) raise(SIGABRT); 72 73 for (;;) { 74 (void) signal(SIGABRT, SIG_DFL); 75 (void) sigrelse(SIGABRT); 76 (void) raise(SIGABRT); 77 } 78 } 79 80 #define SKIP_FRAMES 1 /* skip the panic frame */ 81 #define ERR_STACK_FRAMES 128 82 83 static void 84 print_stacktrace(void) 85 { 86 uintptr_t cur_stack[ERR_STACK_FRAMES]; 87 88 /* 89 * if we are in a signal context, checking for it will recurse 90 */ 91 uint_t nframes = getpcstack(cur_stack, ERR_STACK_FRAMES, 0); 92 uint_t idx; 93 94 if (nframes > SKIP_FRAMES) { 95 umem_printf("stack trace:\n"); 96 97 for (idx = SKIP_FRAMES; idx < nframes; idx++) { 98 (void) print_sym((void *)cur_stack[idx]); 99 umem_printf("\n"); 100 } 101 } 102 } 103 104 void 105 umem_panic(const char *format, ...) 106 { 107 va_list va; 108 109 va_start(va, format); 110 umem_vprintf(format, va); 111 va_end(va); 112 113 if (format[strlen(format)-1] != '\n') 114 umem_error_enter("\n"); 115 116 print_stacktrace(); 117 118 umem_do_abort(); 119 } 120 121 void 122 umem_err_recoverable(const char *format, ...) 123 { 124 va_list va; 125 126 va_start(va, format); 127 umem_vprintf(format, va); 128 va_end(va); 129 130 if (format[strlen(format)-1] != '\n') 131 umem_error_enter("\n"); 132 133 print_stacktrace(); 134 135 if (umem_abort > 0) 136 umem_do_abort(); 137 } 138 139 int 140 __umem_assert_failed(const char *assertion, const char *file, int line) 141 { 142 umem_panic("Assertion failed: %s, file %s, line %d\n", 143 assertion, file, line); 144 /*NOTREACHED*/ 145 return (0); 146 } 147