Commit e193d3ba authored by Colin Percival's avatar Colin Percival
Browse files

libsa: Add support for timestamp logging (tslog)

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
parent 60a978be
......@@ -16,7 +16,7 @@ LIB?= sa
SRCS+= gzguts.h zutil.h __main.c abort.c assert.c bcd.c environment.c \
getopt.c gets.c globals.c \
hexdump.c pager.c panic.c printf.c strdup.c strerror.c \
random.c sbrk.c twiddle.c zalloc.c zalloc_malloc.c
random.c sbrk.c tslog.c twiddle.c zalloc.c zalloc_malloc.c
# private (pruned) versions of libc string functions
SRCS+= strcasecmp.c
......
......@@ -473,4 +473,13 @@ caddr_t ptov(uintptr_t);
/* hexdump.c */
void hexdump(caddr_t region, size_t len);
/* tslog.c */
#define TSRAW(a, b, c) tslog(a, b, c)
#define TSENTER() TSRAW("ENTER", __func__, NULL)
#define TSEXIT() TSRAW("EXIT", __func__, NULL)
#define TSLINE() TSRAW("EVENT", __FILE__, __XSTRING(__LINE__))
void tslog(const char *, const char *, const char *);
void tslog_setbuf(void * buf, size_t len);
void tslog_getbuf(void ** buf, size_t * len);
#endif /* STAND_H */
/*-
* 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;
}
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