mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
e193d3ba33
At present this only supports x86, due to the use of the rdtsc instruction; and is inert unless a buffer is allocated and passed to the tslog code (which will be done by a future commit). Reviewed by: kevans
79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/*-
|
|
* Copyright (c) 2021 Colin Percival
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <machine/cpufunc.h>
|
|
|
|
#include <stand.h>
|
|
|
|
/* Buffer for holding tslog data in string format. */
|
|
static char * tslog_buf = NULL;
|
|
static size_t tslog_buflen = 0;
|
|
static size_t tslog_bufpos = 0;
|
|
|
|
void
|
|
tslog_setbuf(void * buf, size_t len)
|
|
{
|
|
|
|
tslog_buf = (char *)buf;
|
|
tslog_buflen = len;
|
|
tslog_bufpos = 0;
|
|
}
|
|
|
|
void
|
|
tslog_getbuf(void ** buf, size_t * len)
|
|
{
|
|
|
|
*buf = (void *)tslog_buf;
|
|
*len = tslog_bufpos;
|
|
}
|
|
|
|
void
|
|
tslog(const char * type, const char * f, const char * s)
|
|
{
|
|
#if defined(__amd64__) || defined(__i386__)
|
|
uint64_t tsc = rdtsc();
|
|
#else
|
|
uint64_t tsc = 0;
|
|
#endif
|
|
int len;
|
|
|
|
/* If we have no buffer, do nothing. */
|
|
if (tslog_buf == NULL)
|
|
return;
|
|
|
|
/* Append to existing buffer, if we have enough space. */
|
|
len = snprintf(&tslog_buf[tslog_bufpos],
|
|
tslog_buflen - tslog_bufpos, "0x0 %llu %s %s%s%s\n",
|
|
(unsigned long long)tsc, type, f, s ? " " : "", s ? s : "");
|
|
if ((len > 0) && (tslog_bufpos + len <= tslog_buflen))
|
|
tslog_bufpos += len;
|
|
}
|