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 */ 26 27 #include <sys/types.h> 28 #include <sys/sysmacros.h> 29 30 #include <ucontext.h> 31 #include <strings.h> 32 #include <stdio.h> 33 #include <errno.h> 34 35 #include <fmd_trace.h> 36 #include <fmd_alloc.h> 37 #include <fmd_subr.h> 38 #include <fmd_conf.h> 39 #include <fmd.h> 40 41 fmd_tracebuf_t * 42 fmd_trace_create(void) 43 { 44 fmd_tracebuf_t *tbp = fmd_zalloc(sizeof (fmd_tracebuf_t), FMD_SLEEP); 45 size_t bufsize; 46 47 (void) fmd_conf_getprop(fmd.d_conf, "trace.frames", &tbp->tb_frames); 48 (void) fmd_conf_getprop(fmd.d_conf, "trace.recs", &tbp->tb_recs); 49 50 /* 51 * We require 8-byte alignment of fmd_tracerec_t to store hrtime_t's. 52 * Since the trailing flexible array member is of type uintptr_t, we 53 * may need to allocate an additional element if we are compiling 54 * 32-bit; otherwise uintptr_t is 8 bytes so any value of tb_frames is 55 * acceptable. 56 * 57 * tb_frames includes the first element, whose size is reflected in 58 * sizeof (fmd_tracerec_t). Therefore, if fmd_tracerec_t's size is 59 * 0 mod 8, we must be sure the total number of frames is odd. 60 * Otherwise, we need at least one extra frame, so the total count 61 * must be even. This will continue to work even if the sizes or 62 * types of other fmd_tracerec_t members are changed. 63 */ 64 #ifdef _ILP32 65 /*CONSTCOND*/ 66 if (sizeof (fmd_tracerec_t) % sizeof (hrtime_t) == 0) 67 tbp->tb_frames = (tbp->tb_frames & ~1UL) + 1; 68 else 69 tbp->tb_frames = P2ROUNDUP(tbp->tb_frames, 2); 70 #endif 71 tbp->tb_size = sizeof (fmd_tracerec_t) + 72 sizeof (uintptr_t) * (MAX(tbp->tb_frames, 1) - 1); 73 74 bufsize = tbp->tb_size * tbp->tb_recs; 75 76 tbp->tb_buf = fmd_zalloc(bufsize, FMD_SLEEP); 77 tbp->tb_end = (void *)((uintptr_t)tbp->tb_buf + bufsize - tbp->tb_size); 78 tbp->tb_ptr = tbp->tb_buf; 79 80 return (tbp); 81 } 82 83 void 84 fmd_trace_destroy(fmd_tracebuf_t *tbp) 85 { 86 fmd_free(tbp->tb_buf, tbp->tb_size * tbp->tb_recs); 87 fmd_free(tbp, sizeof (fmd_tracebuf_t)); 88 } 89 90 /* 91 * Callback for walkcontext(3C) to store the stack trace. We use tr_tag below 92 * to store the maximum value of depth that is permitted so we can use it here. 93 */ 94 /*ARGSUSED*/ 95 static int 96 fmd_trace_frame(uintptr_t pc, int sig, fmd_tracerec_t *trp) 97 { 98 trp->tr_stack[trp->tr_depth++] = pc; 99 return (trp->tr_depth >= trp->tr_tag); 100 } 101 102 /*ARGSUSED*/ 103 fmd_tracerec_t * 104 fmd_trace_none(fmd_tracebuf_t *tbp, uint_t tag, const char *format, va_list ap) 105 { 106 return (NULL); 107 } 108 109 fmd_tracerec_t * 110 fmd_trace_lite(fmd_tracebuf_t *tbp, uint_t tag, const char *format, va_list ap) 111 { 112 hrtime_t time = gethrtime(); 113 fmd_tracerec_t *trp = tbp->tb_ptr; 114 char *p; 115 116 if (tbp->tb_depth++ != 0) { 117 tbp->tb_depth--; 118 return (NULL); 119 } 120 121 trp->tr_time = time; 122 trp->tr_file = NULL; 123 trp->tr_line = 0; 124 trp->tr_errno = (tag == FMD_DBG_ERR) ? errno : 0; 125 trp->tr_tag = fmd_ntz32(tag); 126 127 (void) vsnprintf(trp->tr_msg, sizeof (trp->tr_msg), format, ap); 128 p = &trp->tr_msg[strlen(trp->tr_msg)]; 129 if (p > trp->tr_msg && p[-1] == '\n') 130 p[-1] = '\0'; 131 132 if (tbp->tb_ptr != tbp->tb_end) 133 tbp->tb_ptr = (void *)((uintptr_t)tbp->tb_ptr + tbp->tb_size); 134 else 135 tbp->tb_ptr = tbp->tb_buf; 136 137 tbp->tb_depth--; 138 return (trp); 139 } 140 141 fmd_tracerec_t * 142 fmd_trace_full(fmd_tracebuf_t *tbp, uint_t tag, const char *format, va_list ap) 143 { 144 hrtime_t time = gethrtime(); 145 fmd_tracerec_t *trp = tbp->tb_ptr; 146 ucontext_t uc; 147 char *p; 148 149 if (tbp->tb_depth++ != 0) { 150 tbp->tb_depth--; 151 return (NULL); 152 } 153 154 (void) getcontext(&uc); 155 trp->tr_depth = 0; 156 trp->tr_tag = tbp->tb_frames; /* for use by fmd_trace_frame() */ 157 (void) walkcontext(&uc, (int (*)())fmd_trace_frame, trp); 158 159 trp->tr_time = time; 160 trp->tr_file = NULL; 161 trp->tr_line = 0; 162 trp->tr_errno = (tag == FMD_DBG_ERR) ? errno : 0; 163 trp->tr_tag = fmd_ntz32(tag); 164 165 if (fmd.d_fmd_debug & FMD_DBG_TRACE) 166 fmd_vdprintf(tag, format, ap); 167 168 (void) vsnprintf(trp->tr_msg, sizeof (trp->tr_msg), format, ap); 169 p = &trp->tr_msg[strlen(trp->tr_msg)]; 170 if (p > trp->tr_msg && p[-1] == '\n') 171 p[-1] = '\0'; 172 173 if (tbp->tb_ptr != tbp->tb_end) 174 tbp->tb_ptr = (void *)((uintptr_t)tbp->tb_ptr + tbp->tb_size); 175 else 176 tbp->tb_ptr = tbp->tb_buf; 177 178 tbp->tb_depth--; 179 return (trp); 180 } 181