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/types.h> 28 29 #if defined(__amd64__) || defined(__i386__) 30 #include <machine/cpufunc.h> 31 #elif defined(__aarch64__) 32 #include <machine/armreg.h> 33 #endif 34 35 #include <stand.h> 36 37 /* Buffer for holding tslog data in string format. */ 38 static char * tslog_buf = NULL; 39 static size_t tslog_buflen = 0; 40 static size_t tslog_bufpos = 0; 41 42 static size_t 43 tsccat(char * buf, uint64_t tsc) 44 { 45 size_t len; 46 47 /* Handle upper digits. */ 48 if (tsc >= 10) 49 len = tsccat(buf, tsc / 10); 50 else 51 len = 0; 52 53 /* Write the last digit. */ 54 buf[len] = "0123456789"[tsc % 10]; 55 56 /* Return the length written. */ 57 return (len + 1); 58 } 59 60 void 61 tslog_setbuf(void * buf, size_t len) 62 { 63 64 tslog_buf = (char *)buf; 65 tslog_buflen = len; 66 tslog_bufpos = 0; 67 } 68 69 void 70 tslog_getbuf(void ** buf, size_t * len) 71 { 72 73 *buf = (void *)tslog_buf; 74 *len = tslog_bufpos; 75 } 76 77 void 78 tslog(const char * type, const char * f, const char * s) 79 { 80 #if defined(__amd64__) || defined(__i386__) 81 uint64_t tsc = rdtsc(); 82 #elif defined(__aarch64__) 83 uint64_t tsc = READ_SPECIALREG(cntvct_el0); 84 #else 85 uint64_t tsc = 0; 86 #endif 87 88 /* If we have no buffer, do nothing. */ 89 if (tslog_buf == NULL) 90 return; 91 92 /* Check that we have enough space. */ 93 if (tslog_buflen - tslog_bufpos < 32 + strlen(type) + strlen(f) + 94 (s ? strlen(s) : 0)) 95 return; 96 97 /* Append to existing buffer. */ 98 strcpy(&tslog_buf[tslog_bufpos], "0x0 "); 99 tslog_bufpos += 4; 100 tslog_bufpos += tsccat(&tslog_buf[tslog_bufpos], tsc); 101 strcpy(&tslog_buf[tslog_bufpos], " "); 102 tslog_bufpos += 1; 103 strcpy(&tslog_buf[tslog_bufpos], type); 104 tslog_bufpos += strlen(type); 105 strcpy(&tslog_buf[tslog_bufpos], " "); 106 tslog_bufpos += 1; 107 strcpy(&tslog_buf[tslog_bufpos], f); 108 tslog_bufpos += strlen(f); 109 if (s != NULL) { 110 strcpy(&tslog_buf[tslog_bufpos], " "); 111 tslog_bufpos += 1; 112 strcpy(&tslog_buf[tslog_bufpos], s); 113 tslog_bufpos += strlen(s); 114 } 115 strcpy(&tslog_buf[tslog_bufpos], "\n"); 116 tslog_bufpos += 1; 117 } 118