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 static size_t 46 tsccat(char * buf, uint64_t tsc) 47 { 48 size_t len; 49 50 /* Handle upper digits. */ 51 if (tsc >= 10) 52 len = tsccat(buf, tsc / 10); 53 else 54 len = 0; 55 56 /* Write the last digit. */ 57 buf[len] = "0123456789"[tsc % 10]; 58 59 /* Return the length written. */ 60 return (len + 1); 61 } 62 63 void 64 tslog_setbuf(void * buf, size_t len) 65 { 66 67 tslog_buf = (char *)buf; 68 tslog_buflen = len; 69 tslog_bufpos = 0; 70 } 71 72 void 73 tslog_getbuf(void ** buf, size_t * len) 74 { 75 76 *buf = (void *)tslog_buf; 77 *len = tslog_bufpos; 78 } 79 80 void 81 tslog(const char * type, const char * f, const char * s) 82 { 83 #if defined(__amd64__) || defined(__i386__) 84 uint64_t tsc = rdtsc(); 85 #elif defined(__aarch64__) 86 uint64_t tsc = READ_SPECIALREG(cntvct_el0); 87 #else 88 uint64_t tsc = 0; 89 #endif 90 91 /* If we have no buffer, do nothing. */ 92 if (tslog_buf == NULL) 93 return; 94 95 /* Check that we have enough space. */ 96 if (tslog_buflen - tslog_bufpos < 32 + strlen(type) + strlen(f) + 97 (s ? strlen(s) : 0)) 98 return; 99 100 /* Append to existing buffer. */ 101 strcpy(&tslog_buf[tslog_bufpos], "0x0 "); 102 tslog_bufpos += 4; 103 tslog_bufpos += tsccat(&tslog_buf[tslog_bufpos], tsc); 104 strcpy(&tslog_buf[tslog_bufpos], " "); 105 tslog_bufpos += 1; 106 strcpy(&tslog_buf[tslog_bufpos], type); 107 tslog_bufpos += strlen(type); 108 strcpy(&tslog_buf[tslog_bufpos], " "); 109 tslog_bufpos += 1; 110 strcpy(&tslog_buf[tslog_bufpos], f); 111 tslog_bufpos += strlen(f); 112 if (s != NULL) { 113 strcpy(&tslog_buf[tslog_bufpos], " "); 114 tslog_bufpos += 1; 115 strcpy(&tslog_buf[tslog_bufpos], s); 116 tslog_bufpos += strlen(s); 117 } 118 strcpy(&tslog_buf[tslog_bufpos], "\n"); 119 tslog_bufpos += 1; 120 } 121