minix/lib/libc/gmon/gmon.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

552 lines
14 KiB
C

/* $NetBSD: gmon.c,v 1.33 2011/01/05 00:03:52 wiz Exp $ */
/*
* Copyright (c) 2003, 2004 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Nathan J. Williams for Wasabi Systems, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
/*-
* Copyright (c) 1983, 1992, 1993
* The Regents of the University of California. 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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>
#if !defined(lint) && defined(LIBC_SCCS)
#if 0
static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: gmon.c,v 1.33 2011/01/05 00:03:52 wiz Exp $");
#endif
#endif
#include "namespace.h"
#include <sys/param.h>
#include <sys/time.h>
#include <sys/gmon.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <err.h>
#include "extern.h"
#include "reentrant.h"
struct gmonparam _gmonparam = { .state = GMON_PROF_OFF };
#ifdef _REENTRANT
struct gmonparam *_gmonfree;
struct gmonparam *_gmoninuse;
mutex_t _gmonlock = MUTEX_INITIALIZER;
thread_key_t _gmonkey;
struct gmonparam _gmondummy;
#endif
static u_int s_scale;
/* see profil(2) where this is describe (incorrectly) */
#define SCALE_1_TO_1 0x10000L
void moncontrol(int);
void monstartup(u_long, u_long);
void _mcleanup(void);
static int hertz(void);
#ifdef _REENTRANT
static void _m_gmon_destructor(void *);
struct gmonparam *_m_gmon_alloc(void)
__attribute__((__no_instrument_function__));
static void _m_gmon_merge(void);
static void _m_gmon_merge_two(struct gmonparam *, struct gmonparam *);
#endif
void
monstartup(u_long lowpc, u_long highpc)
{
u_long o;
char *cp;
struct gmonparam *p = &_gmonparam;
/*
* round lowpc and highpc to multiples of the density we're using
* so the rest of the scaling (here and in gprof) stays in ints.
*/
p->lowpc = rounddown(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
p->highpc = roundup(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
p->textsize = p->highpc - p->lowpc;
p->kcountsize = p->textsize / HISTFRACTION;
p->hashfraction = HASHFRACTION;
p->fromssize = p->textsize / p->hashfraction;
p->tolimit = p->textsize * ARCDENSITY / 100;
if (p->tolimit < MINARCS)
p->tolimit = MINARCS;
else if (p->tolimit > MAXARCS)
p->tolimit = MAXARCS;
p->tossize = p->tolimit * sizeof(struct tostruct);
cp = sbrk((intptr_t)(p->kcountsize + p->fromssize + p->tossize));
if (cp == (char *)-1) {
warnx("%s: out of memory", __func__);
return;
}
#ifdef notdef
(void)memset(cp, 0, p->kcountsize + p->fromssize + p->tossize);
#endif
p->tos = (struct tostruct *)(void *)cp;
cp += (size_t)p->tossize;
p->kcount = (u_short *)(void *)cp;
cp += (size_t)p->kcountsize;
p->froms = (u_short *)(void *)cp;
__minbrk = sbrk((intptr_t)0);
p->tos[0].link = 0;
o = p->highpc - p->lowpc;
if (p->kcountsize < o) {
#ifndef notdef
s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
#else /* avoid floating point */
u_long quot = o / p->kcountsize;
if (quot >= 0x10000)
s_scale = 1;
else if (quot >= 0x100)
s_scale = 0x10000 / quot;
else if (o >= 0x800000)
s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
else
s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
#endif
} else
s_scale = SCALE_1_TO_1;
#ifdef _REENTRANT
_gmondummy.state = GMON_PROF_BUSY;
thr_keycreate(&_gmonkey, _m_gmon_destructor);
#endif
moncontrol(1);
}
#ifdef _REENTRANT
static void
_m_gmon_destructor(void *arg)
{
struct gmonparam *p = arg, *q, **prev;
if (p == &_gmondummy)
return;
thr_setspecific(_gmonkey, &_gmondummy);
mutex_lock(&_gmonlock);
/* XXX eww, linear list traversal. */
for (q = _gmoninuse, prev = &_gmoninuse;
q != NULL;
prev = (struct gmonparam **)(void *)&q->kcount, /* XXX */
q = (struct gmonparam *)(void *)q->kcount) {
if (q == p)
*prev = (struct gmonparam *)(void *)q->kcount;
}
p->kcount = (u_short *)(void *)_gmonfree;
_gmonfree = p;
mutex_unlock(&_gmonlock);
thr_setspecific(_gmonkey, NULL);
}
struct gmonparam *
_m_gmon_alloc(void)
{
struct gmonparam *p;
char *cp;
mutex_lock(&_gmonlock);
if (_gmonfree != NULL) {
p = _gmonfree;
_gmonfree = (struct gmonparam *)(void *)p->kcount;
p->kcount = (u_short *)(void *)_gmoninuse;
_gmoninuse = p;
} else {
mutex_unlock(&_gmonlock);
cp = mmap(NULL,
(size_t)(sizeof (struct gmonparam) +
_gmonparam.fromssize + _gmonparam.tossize),
PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0LL);
p = (void *)cp;
*p = _gmonparam;
p->kcount = NULL;
cp += sizeof (struct gmonparam);
memset(cp, 0, (size_t)(p->fromssize + p->tossize));
p->froms = (u_short *)(void *)cp;
p->tos = (struct tostruct *)(void *)(cp + p->fromssize);
mutex_lock(&_gmonlock);
p->kcount = (u_short *)(void *)_gmoninuse;
_gmoninuse = p;
}
mutex_unlock(&_gmonlock);
thr_setspecific(_gmonkey, p);
return p;
}
static void
_m_gmon_merge_two(struct gmonparam *p, struct gmonparam *q)
{
u_long fromindex;
u_short *frompcindex, qtoindex, toindex;
u_long selfpc;
u_long endfrom;
long count;
struct tostruct *top;
endfrom = (q->fromssize / sizeof(*q->froms));
for (fromindex = 0; fromindex < endfrom; fromindex++) {
if (q->froms[fromindex] == 0)
continue;
for (qtoindex = q->froms[fromindex]; qtoindex != 0;
qtoindex = q->tos[qtoindex].link) {
selfpc = q->tos[qtoindex].selfpc;
count = q->tos[qtoindex].count;
/* cribbed from mcount */
frompcindex = &p->froms[fromindex];
toindex = *frompcindex;
if (toindex == 0) {
/*
* first time traversing this arc
*/
toindex = ++p->tos[0].link;
if (toindex >= p->tolimit)
/* halt further profiling */
goto overflow;
*frompcindex = (u_short)toindex;
top = &p->tos[(size_t)toindex];
top->selfpc = selfpc;
top->count = count;
top->link = 0;
goto done;
}
top = &p->tos[(size_t)toindex];
if (top->selfpc == selfpc) {
/*
* arc at front of chain; usual case.
*/
top->count+= count;
goto done;
}
/*
* have to go looking down chain for it.
* top points to what we are looking at,
* we know it is not at the head of the chain.
*/
for (; /* goto done */; ) {
if (top->link == 0) {
/*
* top is end of the chain and
* none of the chain had
* top->selfpc == selfpc. so
* we allocate a new tostruct
* and link it to the head of
* the chain.
*/
toindex = ++p->tos[0].link;
if (toindex >= p->tolimit)
goto overflow;
top = &p->tos[(size_t)toindex];
top->selfpc = selfpc;
top->count = count;
top->link = *frompcindex;
*frompcindex = (u_short)toindex;
goto done;
}
/*
* otherwise, check the next arc on the chain.
*/
top = &p->tos[top->link];
if (top->selfpc == selfpc) {
/*
* there it is.
* add to its count.
*/
top->count += count;
goto done;
}
}
done: ;
}
}
overflow: ;
}
static void
_m_gmon_merge(void)
{
struct gmonparam *q;
mutex_lock(&_gmonlock);
for (q = _gmonfree; q != NULL;
q = (struct gmonparam *)(void *)q->kcount)
_m_gmon_merge_two(&_gmonparam, q);
for (q = _gmoninuse; q != NULL;
q = (struct gmonparam *)(void *)q->kcount) {
q->state = GMON_PROF_OFF;
_m_gmon_merge_two(&_gmonparam, q);
}
mutex_unlock(&_gmonlock);
}
#endif
void
_mcleanup(void)
{
int fd;
int fromindex;
int endfrom;
u_long frompc;
int toindex;
struct rawarc rawarc;
struct gmonparam *p = &_gmonparam;
struct gmonhdr gmonhdr, *hdr;
struct clockinfo clockinfo;
#ifndef __minix
int mib[2];
size_t size;
#endif
char *profdir;
const char *proffile;
char buf[PATH_MAX];
#ifdef DEBUG
int logfd, len;
char buf2[200];
#endif
/*
* We disallow writing to the profiling file, if we are a
* set{u,g}id program and our effective {u,g}id does not match
* our real one.
*/
if (issetugid() && (geteuid() != getuid() || getegid() != getgid())) {
warnx("%s: Profiling of set{u,g}id binaries is not"
" allowed", __func__);
return;
}
if (p->state == GMON_PROF_ERROR)
warnx("%s: tos overflow", __func__);
#ifdef __minix
clockinfo.profhz = sysconf(_SC_CLK_TCK);
#else /* !__minix */
size = sizeof(clockinfo);
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
/*
* Best guess
*/
clockinfo.profhz = hertz();
} else if (clockinfo.profhz == 0) {
if (clockinfo.hz != 0)
clockinfo.profhz = clockinfo.hz;
else
clockinfo.profhz = hertz();
}
#endif /* !__minix */
moncontrol(0);
if ((profdir = getenv("PROFDIR")) != NULL) {
/* If PROFDIR contains a null value, no profiling
output is produced */
if (*profdir == '\0')
return;
if (snprintf(buf, sizeof buf, "%s/%d.%s",
profdir, getpid(), getprogname()) >= (int)(sizeof buf)) {
warnx("%s: internal buffer overflow, PROFDIR too long",
__func__);
return;
}
proffile = buf;
} else {
proffile = "gmon.out";
}
fd = open(proffile , O_CREAT|O_TRUNC|O_WRONLY, 0666);
if (fd < 0) {
warn("%s: Cannot open `%s'", __func__, proffile);
return;
}
#ifdef DEBUG
logfd = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
if (logfd < 0) {
warn("%s: Cannot open `%s'", __func__, "gmon.log");
(void)close(fd);
return;
}
len = snprintf(buf2, sizeof buf2, "[mcleanup1] kcount %p ssiz %lu\n",
p->kcount, p->kcountsize);
(void)write(logfd, buf2, (size_t)len);
#endif
#ifdef _REENTRANT
_m_gmon_merge();
#endif
hdr = (struct gmonhdr *)&gmonhdr;
hdr->lpc = p->lowpc;
hdr->hpc = p->highpc;
hdr->ncnt = (int)(p->kcountsize + sizeof(gmonhdr));
hdr->version = GMONVERSION;
hdr->profrate = clockinfo.profhz;
(void)write(fd, hdr, sizeof *hdr);
(void)write(fd, p->kcount, (size_t)p->kcountsize);
endfrom = (int)(p->fromssize / sizeof(*p->froms));
for (fromindex = 0; fromindex < endfrom; fromindex++) {
if (p->froms[fromindex] == 0)
continue;
frompc = p->lowpc;
frompc += fromindex * p->hashfraction * sizeof(*p->froms);
for (toindex = p->froms[fromindex]; toindex != 0;
toindex = p->tos[toindex].link) {
#ifdef DEBUG
len = snprintf(buf2, sizeof buf2,
"[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
(u_long)frompc, (u_long)p->tos[toindex].selfpc,
(u_long)p->tos[toindex].count);
(void)write(logfd, buf2, (size_t)len);
#endif
rawarc.raw_frompc = frompc;
rawarc.raw_selfpc = p->tos[toindex].selfpc;
rawarc.raw_count = p->tos[toindex].count;
(void)write(fd, &rawarc, sizeof rawarc);
}
}
(void)close(fd);
#ifdef DEBUG
(void)close(logfd);
#endif
}
/*
* Control profiling
* profiling is what mcount checks to see if
* all the data structures are ready.
*/
void
moncontrol(int mode)
{
struct gmonparam *p = &_gmonparam;
if (mode) {
/* start */
profil((char *)(void *)p->kcount, (size_t)p->kcountsize,
p->lowpc, s_scale);
p->state = GMON_PROF_ON;
} else {
/* stop */
profil(NULL, 0, (u_long)0, 0);
p->state = GMON_PROF_OFF;
}
}
#ifndef __minix
/*
* discover the tick frequency of the machine
* if something goes wrong, we return 0, an impossible hertz.
*/
static int
hertz(void)
{
struct itimerspec tim;
timer_t t;
int rv = 0;
tim.it_interval.tv_sec = 0;
tim.it_interval.tv_nsec = 1;
tim.it_value.tv_sec = 0;
tim.it_value.tv_nsec = 0;
if (timer_create(CLOCK_REALTIME, NULL, &t) == -1)
return 0;
if (timer_settime(t, 0, &tim, NULL) == -1)
goto out;
if (timer_gettime(t, &tim) == -1)
goto out;
if (tim.it_interval.tv_nsec < 2)
goto out;
rv = (int)(1000000000LL / tim.it_interval.tv_nsec);
out:
(void)timer_delete(t);
return rv;
}
#endif /* !__minix */