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e6caac717b
The original code only supported x86 and used rdtsc(); we now also support arm64 and use the CNTVCT_EL0 special register.
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*-
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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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#if defined(__amd64__) || defined(__i386__)
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#include <machine/cpufunc.h>
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#elif defined(__aarch64__)
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#include <machine/armreg.h>
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#endif
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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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#elif defined(__aarch64__)
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uint64_t tsc = READ_SPECIALREG(cntvct_el0);
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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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