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 #if defined(__amd64__) || defined(__i386__) 33 #include <machine/cpufunc.h> 34 #elif defined(__aarch64__) 35 #include <machine/armreg.h> 36 #endif 37 38 #include <stand.h> 39 40 /* Buffer for holding tslog data in string format. */ 41 static char * tslog_buf = NULL; 42 static size_t tslog_buflen = 0; 43 static size_t tslog_bufpos = 0; 44 45 void 46 tslog_setbuf(void * buf, size_t len) 47 { 48 49 tslog_buf = (char *)buf; 50 tslog_buflen = len; 51 tslog_bufpos = 0; 52 } 53 54 void 55 tslog_getbuf(void ** buf, size_t * len) 56 { 57 58 *buf = (void *)tslog_buf; 59 *len = tslog_bufpos; 60 } 61 62 void 63 tslog(const char * type, const char * f, const char * s) 64 { 65 #if defined(__amd64__) || defined(__i386__) 66 uint64_t tsc = rdtsc(); 67 #elif defined(__aarch64__) 68 uint64_t tsc = READ_SPECIALREG(cntvct_el0); 69 #else 70 uint64_t tsc = 0; 71 #endif 72 int len; 73 74 /* If we have no buffer, do nothing. */ 75 if (tslog_buf == NULL) 76 return; 77 78 /* Append to existing buffer, if we have enough space. */ 79 len = snprintf(&tslog_buf[tslog_bufpos], 80 tslog_buflen - tslog_bufpos, "0x0 %llu %s %s%s%s\n", 81 (unsigned long long)tsc, type, f, s ? " " : "", s ? s : ""); 82 if ((len > 0) && (tslog_bufpos + len <= tslog_buflen)) 83 tslog_bufpos += len; 84 } 85