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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <ucontext.h>
#include <strings.h>
#include <stdio.h>
#include <errno.h>
#include <fmd_trace.h>
#include <fmd_alloc.h>
#include <fmd_subr.h>
#include <fmd_conf.h>
#include <fmd.h>
fmd_tracebuf_t *
fmd_trace_create(void)
{
fmd_tracebuf_t *tbp = fmd_zalloc(sizeof (fmd_tracebuf_t), FMD_SLEEP);
size_t bufsize;
(void) fmd_conf_getprop(fmd.d_conf, "trace.frames", &tbp->tb_frames);
(void) fmd_conf_getprop(fmd.d_conf, "trace.recs", &tbp->tb_recs);
/*
* We require 8-byte alignment of fmd_tracerec_t to store hrtime_t's.
* Since the trailing flexible array member is of type uintptr_t, we
* may need to allocate an additional element if we are compiling
* 32-bit; otherwise uintptr_t is 8 bytes so any value of tb_frames is
* acceptable.
*
* tb_frames includes the first element, whose size is reflected in
* sizeof (fmd_tracerec_t). Therefore, if fmd_tracerec_t's size is
* 0 mod 8, we must be sure the total number of frames is odd.
* Otherwise, we need at least one extra frame, so the total count
* must be even. This will continue to work even if the sizes or
* types of other fmd_tracerec_t members are changed.
*/
#ifdef _ILP32
/*CONSTCOND*/
if (sizeof (fmd_tracerec_t) % sizeof (hrtime_t) == 0)
tbp->tb_frames = (tbp->tb_frames & ~1UL) + 1;
else
tbp->tb_frames = P2ROUNDUP(tbp->tb_frames, 2);
#endif
tbp->tb_size = sizeof (fmd_tracerec_t) +
sizeof (uintptr_t) * (MAX(tbp->tb_frames, 1) - 1);
bufsize = tbp->tb_size * tbp->tb_recs;
tbp->tb_buf = fmd_zalloc(bufsize, FMD_SLEEP);
tbp->tb_end = (void *)((uintptr_t)tbp->tb_buf + bufsize - tbp->tb_size);
tbp->tb_ptr = tbp->tb_buf;
return (tbp);
}
void
fmd_trace_destroy(fmd_tracebuf_t *tbp)
{
fmd_free(tbp->tb_buf, tbp->tb_size * tbp->tb_recs);
fmd_free(tbp, sizeof (fmd_tracebuf_t));
}
/*
* Callback for walkcontext(3C) to store the stack trace. We use tr_tag below
* to store the maximum value of depth that is permitted so we can use it here.
*/
/*ARGSUSED*/
static int
fmd_trace_frame(uintptr_t pc, int sig, fmd_tracerec_t *trp)
{
trp->tr_stack[trp->tr_depth++] = pc;
return (trp->tr_depth >= trp->tr_tag);
}
/*ARGSUSED*/
fmd_tracerec_t *
fmd_trace_none(fmd_tracebuf_t *tbp, uint_t tag, const char *format, va_list ap)
{
return (NULL);
}
fmd_tracerec_t *
fmd_trace_lite(fmd_tracebuf_t *tbp, uint_t tag, const char *format, va_list ap)
{
hrtime_t time = gethrtime();
fmd_tracerec_t *trp = tbp->tb_ptr;
char *p;
if (tbp->tb_depth++ != 0) {
tbp->tb_depth--;
return (NULL);
}
trp->tr_time = time;
trp->tr_file = NULL;
trp->tr_line = 0;
trp->tr_errno = (tag == FMD_DBG_ERR) ? errno : 0;
trp->tr_tag = fmd_ntz32(tag);
(void) vsnprintf(trp->tr_msg, sizeof (trp->tr_msg), format, ap);
p = &trp->tr_msg[strlen(trp->tr_msg)];
if (p > trp->tr_msg && p[-1] == '\n')
p[-1] = '\0';
if (tbp->tb_ptr != tbp->tb_end)
tbp->tb_ptr = (void *)((uintptr_t)tbp->tb_ptr + tbp->tb_size);
else
tbp->tb_ptr = tbp->tb_buf;
tbp->tb_depth--;
return (trp);
}
fmd_tracerec_t *
fmd_trace_full(fmd_tracebuf_t *tbp, uint_t tag, const char *format, va_list ap)
{
hrtime_t time = gethrtime();
fmd_tracerec_t *trp = tbp->tb_ptr;
ucontext_t uc;
char *p;
if (tbp->tb_depth++ != 0) {
tbp->tb_depth--;
return (NULL);
}
(void) getcontext(&uc);
trp->tr_depth = 0;
trp->tr_tag = tbp->tb_frames; /* for use by fmd_trace_frame() */
(void) walkcontext(&uc, (int (*)())fmd_trace_frame, trp);
trp->tr_time = time;
trp->tr_file = NULL;
trp->tr_line = 0;
trp->tr_errno = (tag == FMD_DBG_ERR) ? errno : 0;
trp->tr_tag = fmd_ntz32(tag);
if (fmd.d_fmd_debug & FMD_DBG_TRACE)
fmd_vdprintf(tag, format, ap);
(void) vsnprintf(trp->tr_msg, sizeof (trp->tr_msg), format, ap);
p = &trp->tr_msg[strlen(trp->tr_msg)];
if (p > trp->tr_msg && p[-1] == '\n')
p[-1] = '\0';
if (tbp->tb_ptr != tbp->tb_end)
tbp->tb_ptr = (void *)((uintptr_t)tbp->tb_ptr + tbp->tb_size);
else
tbp->tb_ptr = tbp->tb_buf;
tbp->tb_depth--;
return (trp);
}
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