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
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@ -16,7 +16,7 @@ LIB?= sa
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SRCS+= gzguts.h zutil.h __main.c abort.c assert.c bcd.c environment.c \
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getopt.c gets.c globals.c \
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hexdump.c pager.c panic.c printf.c strdup.c strerror.c \
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random.c sbrk.c twiddle.c zalloc.c zalloc_malloc.c
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random.c sbrk.c tslog.c twiddle.c zalloc.c zalloc_malloc.c
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# private (pruned) versions of libc string functions
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SRCS+= strcasecmp.c
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@ -473,4 +473,13 @@ caddr_t ptov(uintptr_t);
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/* hexdump.c */
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void hexdump(caddr_t region, size_t len);
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/* tslog.c */
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#define TSRAW(a, b, c) tslog(a, b, c)
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#define TSENTER() TSRAW("ENTER", __func__, NULL)
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#define TSEXIT() TSRAW("EXIT", __func__, NULL)
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#define TSLINE() TSRAW("EVENT", __FILE__, __XSTRING(__LINE__))
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void tslog(const char *, const char *, const char *);
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void tslog_setbuf(void * buf, size_t len);
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void tslog_getbuf(void ** buf, size_t * len);
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#endif /* STAND_H */
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@ -0,0 +1,78 @@
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/*-
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* Copyright (c) 2021 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <machine/cpufunc.h>
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#include <stand.h>
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/* Buffer for holding tslog data in string format. */
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static char * tslog_buf = NULL;
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static size_t tslog_buflen = 0;
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static size_t tslog_bufpos = 0;
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void
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tslog_setbuf(void * buf, size_t len)
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{
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tslog_buf = (char *)buf;
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tslog_buflen = len;
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tslog_bufpos = 0;
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}
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void
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tslog_getbuf(void ** buf, size_t * len)
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{
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*buf = (void *)tslog_buf;
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*len = tslog_bufpos;
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}
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void
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tslog(const char * type, const char * f, const char * s)
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{
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#if defined(__amd64__) || defined(__i386__)
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uint64_t tsc = rdtsc();
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#else
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uint64_t tsc = 0;
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#endif
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int len;
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/* If we have no buffer, do nothing. */
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if (tslog_buf == NULL)
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return;
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/* Append to existing buffer, if we have enough space. */
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len = snprintf(&tslog_buf[tslog_bufpos],
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tslog_buflen - tslog_bufpos, "0x0 %llu %s %s%s%s\n",
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(unsigned long long)tsc, type, f, s ? " " : "", s ? s : "");
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if ((len > 0) && (tslog_bufpos + len <= tslog_buflen))
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tslog_bufpos += len;
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}
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