1 /*- 2 * Copyright (c) 2021 Colin Percival 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 32 #include <machine/cpufunc.h> 33 34 #include <stand.h> 35 36 /* Buffer for holding tslog data in string format. */ 37 static char * tslog_buf = NULL; 38 static size_t tslog_buflen = 0; 39 static size_t tslog_bufpos = 0; 40 41 void 42 tslog_setbuf(void * buf, size_t len) 43 { 44 45 tslog_buf = (char *)buf; 46 tslog_buflen = len; 47 tslog_bufpos = 0; 48 } 49 50 void 51 tslog_getbuf(void ** buf, size_t * len) 52 { 53 54 *buf = (void *)tslog_buf; 55 *len = tslog_bufpos; 56 } 57 58 void 59 tslog(const char * type, const char * f, const char * s) 60 { 61 #if defined(__amd64__) || defined(__i386__) 62 uint64_t tsc = rdtsc(); 63 #else 64 uint64_t tsc = 0; 65 #endif 66 int len; 67 68 /* If we have no buffer, do nothing. */ 69 if (tslog_buf == NULL) 70 return; 71 72 /* Append to existing buffer, if we have enough space. */ 73 len = snprintf(&tslog_buf[tslog_bufpos], 74 tslog_buflen - tslog_bufpos, "0x0 %llu %s %s%s%s\n", 75 (unsigned long long)tsc, type, f, s ? " " : "", s ? s : ""); 76 if ((len > 0) && (tslog_bufpos + len <= tslog_buflen)) 77 tslog_bufpos += len; 78 } 79