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 #include <sys/types.h> 30 #include <sys/sysmacros.h> 31 32 #include <ucontext.h> 33 #include <strings.h> 34 #include <stdio.h> 35 #include <errno.h> 36 37 #include <fmd_trace.h> 38 #include <fmd_alloc.h> 39 #include <fmd_subr.h> 40 #include <fmd_conf.h> 41 #include <fmd.h> 42 43 fmd_tracebuf_t * 44 fmd_trace_create(void) 45 { 46 fmd_tracebuf_t *tbp = fmd_zalloc(sizeof (fmd_tracebuf_t), FMD_SLEEP); 47 size_t bufsize; 48 49 (void) fmd_conf_getprop(fmd.d_conf, "trace.frames", &tbp->tb_frames); 50 (void) fmd_conf_getprop(fmd.d_conf, "trace.recs", &tbp->tb_recs); 51 52 /* 53 * We require 8-byte alignment of fmd_tracerec_t to store hrtime_t's. 54 * Since the trailing flexible array member is of type uintptr_t, we 55 * must make it a multiple of 2 if we are compiling 32-bit; otherwise 56 * uintptr_t is 8 bytes so any value of tb_frames is acceptable. 57 */ 58 #ifdef _ILP32 59 tbp->tb_frames = P2ROUNDUP(tbp->tb_frames, 2); 60 #endif 61 tbp->tb_size = sizeof (fmd_tracerec_t) + 62 sizeof (uintptr_t) * (MAX(tbp->tb_frames, 1) - 1); 63 64 bufsize = tbp->tb_size * tbp->tb_recs; 65 66 tbp->tb_buf = fmd_zalloc(bufsize, FMD_SLEEP); 67 tbp->tb_end = (void *)((uintptr_t)tbp->tb_buf + bufsize - tbp->tb_size); 68 tbp->tb_ptr = tbp->tb_buf; 69 70 return (tbp); 71 } 72 73 void 74 fmd_trace_destroy(fmd_tracebuf_t *tbp) 75 { 76 fmd_free(tbp->tb_buf, tbp->tb_size * tbp->tb_recs); 77 fmd_free(tbp, sizeof (fmd_tracebuf_t)); 78 } 79 80 /* 81 * Callback for walkcontext(3C) to store the stack trace. We use tr_tag below 82 * to store the maximum value of depth that is permitted so we can use it here. 83 */ 84 /*ARGSUSED*/ 85 static int 86 fmd_trace_frame(uintptr_t pc, int sig, fmd_tracerec_t *trp) 87 { 88 trp->tr_stack[trp->tr_depth++] = pc; 89 return (trp->tr_depth >= trp->tr_tag); 90 } 91 92 /*ARGSUSED*/ 93 fmd_tracerec_t * 94 fmd_trace_none(fmd_tracebuf_t *tbp, uint8_t tag, const char *format, va_list ap) 95 { 96 return (NULL); 97 } 98 99 fmd_tracerec_t * 100 fmd_trace_lite(fmd_tracebuf_t *tbp, uint8_t tag, const char *format, va_list ap) 101 { 102 hrtime_t time = gethrtime(); 103 fmd_tracerec_t *trp = tbp->tb_ptr; 104 char *p; 105 106 trp->tr_time = time; 107 trp->tr_file = NULL; 108 trp->tr_line = 0; 109 trp->tr_errno = (tag == FMD_DBG_ERR) ? errno : 0; 110 trp->tr_tag = tag; 111 112 (void) vsnprintf(trp->tr_msg, sizeof (trp->tr_msg), format, ap); 113 p = &trp->tr_msg[strlen(trp->tr_msg)]; 114 if (p > trp->tr_msg && p[-1] == '\n') 115 p[-1] = '\0'; 116 117 if (tbp->tb_ptr != tbp->tb_end) 118 tbp->tb_ptr = (void *)((uintptr_t)tbp->tb_ptr + tbp->tb_size); 119 else 120 tbp->tb_ptr = tbp->tb_buf; 121 122 return (trp); 123 } 124 125 fmd_tracerec_t * 126 fmd_trace_full(fmd_tracebuf_t *tbp, uint8_t tag, const char *format, va_list ap) 127 { 128 hrtime_t time = gethrtime(); 129 fmd_tracerec_t *trp = tbp->tb_ptr; 130 ucontext_t uc; 131 char *p; 132 133 (void) getcontext(&uc); 134 trp->tr_tag = tbp->tb_frames; /* for use by fmd_trace_frame() */ 135 (void) walkcontext(&uc, (int (*)())fmd_trace_frame, trp); 136 137 trp->tr_time = time; 138 trp->tr_file = NULL; 139 trp->tr_line = 0; 140 trp->tr_errno = (tag == FMD_DBG_ERR) ? errno : 0; 141 trp->tr_tag = tag; 142 143 (void) vsnprintf(trp->tr_msg, sizeof (trp->tr_msg), format, ap); 144 p = &trp->tr_msg[strlen(trp->tr_msg)]; 145 if (p > trp->tr_msg && p[-1] == '\n') 146 p[-1] = '\0'; 147 148 if (tbp->tb_ptr != tbp->tb_end) 149 tbp->tb_ptr = (void *)((uintptr_t)tbp->tb_ptr + tbp->tb_size); 150 else 151 tbp->tb_ptr = tbp->tb_buf; 152 153 return (trp); 154 } 155