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 #include <sys/types.h> 29 30 #if defined(__amd64__) || defined(__i386__) 31 #include <machine/cpufunc.h> 32 #elif defined(__aarch64__) 33 #include <machine/armreg.h> 34 #endif 35 36 #include <stand.h> 37 38 /* Buffer for holding tslog data in string format. */ 39 static char * tslog_buf = NULL; 40 static size_t tslog_buflen = 0; 41 static size_t tslog_bufpos = 0; 42 43 static size_t 44 tsccat(char * buf, uint64_t tsc) 45 { 46 size_t len; 47 48 /* Handle upper digits. */ 49 if (tsc >= 10) 50 len = tsccat(buf, tsc / 10); 51 else 52 len = 0; 53 54 /* Write the last digit. */ 55 buf[len] = "0123456789"[tsc % 10]; 56 57 /* Return the length written. */ 58 return (len + 1); 59 } 60 61 void 62 tslog_setbuf(void * buf, size_t len) 63 { 64 65 tslog_buf = (char *)buf; 66 tslog_buflen = len; 67 tslog_bufpos = 0; 68 } 69 70 void 71 tslog_getbuf(void ** buf, size_t * len) 72 { 73 74 *buf = (void *)tslog_buf; 75 *len = tslog_bufpos; 76 } 77 78 void 79 tslog(const char * type, const char * f, const char * s) 80 { 81 #if defined(__amd64__) || defined(__i386__) 82 uint64_t tsc = rdtsc(); 83 #elif defined(__aarch64__) 84 uint64_t tsc = READ_SPECIALREG(cntvct_el0); 85 #else 86 uint64_t tsc = 0; 87 #endif 88 89 /* If we have no buffer, do nothing. */ 90 if (tslog_buf == NULL) 91 return; 92 93 /* Check that we have enough space. */ 94 if (tslog_buflen - tslog_bufpos < 32 + strlen(type) + strlen(f) + 95 (s ? strlen(s) : 0)) 96 return; 97 98 /* Append to existing buffer. */ 99 strcpy(&tslog_buf[tslog_bufpos], "0x0 "); 100 tslog_bufpos += 4; 101 tslog_bufpos += tsccat(&tslog_buf[tslog_bufpos], tsc); 102 strcpy(&tslog_buf[tslog_bufpos], " "); 103 tslog_bufpos += 1; 104 strcpy(&tslog_buf[tslog_bufpos], type); 105 tslog_bufpos += strlen(type); 106 strcpy(&tslog_buf[tslog_bufpos], " "); 107 tslog_bufpos += 1; 108 strcpy(&tslog_buf[tslog_bufpos], f); 109 tslog_bufpos += strlen(f); 110 if (s != NULL) { 111 strcpy(&tslog_buf[tslog_bufpos], " "); 112 tslog_bufpos += 1; 113 strcpy(&tslog_buf[tslog_bufpos], s); 114 tslog_bufpos += strlen(s); 115 } 116 strcpy(&tslog_buf[tslog_bufpos], "\n"); 117 tslog_bufpos += 1; 118 } 119