[dragonfly.git] / lib / libc / gmon / gmon.c

/*-
 * 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.
 * 4. 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.
 *
 * @(#)gmon.c	8.1 (Berkeley) 6/4/93
 * $FreeBSD: src/lib/libc/gmon/gmon.c,v 1.22 2007/01/09 00:27:58 imp Exp $
 * $DragonFly: src/lib/libc/gmon/gmon.c,v 1.8 2005/11/13 01:18:20 swildner Exp $
 */

#include "namespace.h"
#include <sys/param.h>
#include <sys/time.h>
#include <sys/gmon.h>
#include <sys/sysctl.h>

#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"

#include "libc_private.h"

#if defined(__i386__) || defined(__sparc64__) || defined(__x86_64__) || defined(__powerpc__)
extern char *minbrk __asm (".minbrk");
#else
extern char *minbrk __asm ("minbrk");
#endif

struct gmonparam _gmonparam = { GMON_PROF_OFF };

static int	s_scale;
/* see profil(2) where this is describe (incorrectly) */
#define		SCALE_1_TO_1	0x10000L

#define ERR(s) _write(2, s, sizeof(s))

void	moncontrol(int);
static int hertz(void);

void
monstartup(u_long lowpc, u_long highpc)
{
	int 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 / 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(p->kcountsize + p->fromssize + p->tossize);
	if (cp == (char *)-1) {
		ERR("monstartup: out of memory\n");
		return;
	}
#ifdef notdef
	bzero(cp, p->kcountsize + p->fromssize + p->tossize);
#endif
	p->tos = (struct tostruct *)cp;
	cp += p->tossize;
	p->kcount = (u_short *)cp;
	cp += p->kcountsize;
	p->froms = (u_short *)cp;

	minbrk = sbrk(0);
	p->tos[0].link = 0;

	o = p->highpc - p->lowpc;
	if (p->kcountsize < o) {
#ifndef hp300
		s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
#else /* avoid floating point */
		int 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;

	moncontrol(1);
}

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;
	char outname[128];
	int mib[2];
	size_t size;
#ifdef DEBUG
	int log, len;
	char buf[200];
#endif

	if (p->state == GMON_PROF_ERROR)
		ERR("_mcleanup: tos overflow\n");

	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();
	}

	moncontrol(0);
	snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
	fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666);
	if (fd < 0) {
		_warn("_mcleanup: %s", outname);
		return;
	}
#ifdef DEBUG
	log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
	if (log < 0) {
		_warn("_mcleanup: gmon.log");
		return;
	}
	len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
	    p->kcount, p->kcountsize);
	_write(log, buf, len);
#endif
	hdr = (struct gmonhdr *)&gmonhdr;
	bzero(hdr, sizeof(*hdr));
	hdr->lpc = p->lowpc;
	hdr->hpc = p->highpc;
	hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
	hdr->version = GMONVERSION;
	hdr->profrate = clockinfo.profhz;
	_write(fd, (char *)hdr, sizeof *hdr);
	_write(fd, p->kcount, p->kcountsize);
	endfrom = 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 = sprintf(buf,
			"[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
				frompc, p->tos[toindex].selfpc,
				p->tos[toindex].count);
			_write(log, buf, len);
#endif
			rawarc.raw_frompc = frompc;
			rawarc.raw_selfpc = p->tos[toindex].selfpc;
			rawarc.raw_count = p->tos[toindex].count;
			_write(fd, &rawarc, sizeof rawarc);
		}
	}
	_close(fd);
}

/*
 * 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 *)p->kcount, p->kcountsize, p->lowpc, s_scale);
		p->state = GMON_PROF_ON;
	} else {
		/* stop */
		profil(NULL, 0, 0, 0);
		p->state = GMON_PROF_OFF;
	}
}

/*
 * discover the tick frequency of the machine
 * if something goes wrong, we return 0, an impossible hertz.
 */
static int
hertz(void)
{
	struct itimerval tim;

	tim.it_interval.tv_sec = 0;
	tim.it_interval.tv_usec = 1;
	tim.it_value.tv_sec = 0;
	tim.it_value.tv_usec = 0;
	setitimer(ITIMER_REAL, &tim, 0);
	setitimer(ITIMER_REAL, 0, &tim);
	if (tim.it_interval.tv_usec < 2)
		return(0);
	return (1000000 / tim.it_interval.tv_usec);
}
Commit	Line	Data
984263bc MD	1	/*-
	2	* Copyright (c) 1983, 1992, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
984263bc MD	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*
1de703da	29	* @(#)gmon.c 8.1 (Berkeley) 6/4/93
215fdc4a PA	30	* $FreeBSD: src/lib/libc/gmon/gmon.c,v 1.22 2007/01/09 00:27:58 imp Exp $
215fdc4a PA	31	* $DragonFly: src/lib/libc/gmon/gmon.c,v 1.8 2005/11/13 01:18:20 swildner Exp $
984263bc MD	32	*/
984263bc MD	33
17ea2221	34	#include "namespace.h"
984263bc MD	35	#include <sys/param.h>
	36	#include <sys/time.h>
	37	#include <sys/gmon.h>
	38	#include <sys/sysctl.h>
	39
	40	#include <err.h>
984263bc	41	#include <fcntl.h>
215fdc4a	42	#include <stdio.h>
e59e8ef1	43	#include <stdlib.h>
17ea2221	44	#include <string.h>
984263bc	45	#include <unistd.h>
17ea2221	46	#include "un-namespace.h"
984263bc	47
215fdc4a PA	48	#include "libc_private.h"
215fdc4a PA	49
c1543a89	50	#if defined(__i386__) \|\| defined(__sparc64__) \|\| defined(__x86_64__) \|\| defined(__powerpc__)
215fdc4a	51	extern char *minbrk __asm (".minbrk");
984263bc	52	#else
215fdc4a	53	extern char *minbrk __asm ("minbrk");
984263bc MD	54	#endif
984263bc MD	55
984263bc MD	56	struct gmonparam _gmonparam = { GMON_PROF_OFF };
	57
	58	static int s_scale;
	59	/* see profil(2) where this is describe (incorrectly) */
	60	#define SCALE_1_TO_1 0x10000L
	61
	62	#define ERR(s) _write(2, s, sizeof(s))
	63
215fdc4a PA	64	void moncontrol(int);
215fdc4a PA	65	static int hertz(void);
984263bc MD	66
984263bc MD	67	void
5556e324	68	monstartup(u_long lowpc, u_long highpc)
984263bc	69	{
660c873b	70	int o;
984263bc MD	71	char *cp;
	72	struct gmonparam *p = &_gmonparam;
	73
	74	/*
	75	* round lowpc and highpc to multiples of the density we're using
	76	* so the rest of the scaling (here and in gprof) stays in ints.
	77	*/
	78	p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
	79	p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
	80	p->textsize = p->highpc - p->lowpc;
	81	p->kcountsize = p->textsize / HISTFRACTION;
	82	p->hashfraction = HASHFRACTION;
	83	p->fromssize = p->textsize / HASHFRACTION;
	84	p->tolimit = p->textsize * ARCDENSITY / 100;
	85	if (p->tolimit < MINARCS)
	86	p->tolimit = MINARCS;
	87	else if (p->tolimit > MAXARCS)
	88	p->tolimit = MAXARCS;
	89	p->tossize = p->tolimit * sizeof(struct tostruct);
	90
	91	cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
	92	if (cp == (char *)-1) {
	93	ERR("monstartup: out of memory\n");
	94	return;
	95	}
	96	#ifdef notdef
	97	bzero(cp, p->kcountsize + p->fromssize + p->tossize);
	98	#endif
	99	p->tos = (struct tostruct *)cp;
	100	cp += p->tossize;
	101	p->kcount = (u_short *)cp;
	102	cp += p->kcountsize;
	103	p->froms = (u_short *)cp;
	104
	105	minbrk = sbrk(0);
	106	p->tos[0].link = 0;
	107
	108	o = p->highpc - p->lowpc;
	109	if (p->kcountsize < o) {
	110	#ifndef hp300
	111	s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
	112	#else /* avoid floating point */
	113	int quot = o / p->kcountsize;
	114
	115	if (quot >= 0x10000)
	116	s_scale = 1;
	117	else if (quot >= 0x100)
	118	s_scale = 0x10000 / quot;
	119	else if (o >= 0x800000)
	120	s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
	121	else
	122	s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
	123	#endif
	124	} else
	125	s_scale = SCALE_1_TO_1;
	126
	127	moncontrol(1);
	128	}
	129
	130	void
5556e324	131	_mcleanup(void)
984263bc MD	132	{
	133	int fd;
	134	int fromindex;
	135	int endfrom;
	136	u_long frompc;
	137	int toindex;
	138	struct rawarc rawarc;
	139	struct gmonparam *p = &_gmonparam;
	140	struct gmonhdr gmonhdr, *hdr;
	141	struct clockinfo clockinfo;
	142	char outname[128];
	143	int mib[2];
	144	size_t size;
	145	#ifdef DEBUG
	146	int log, len;
	147	char buf[200];
	148	#endif
	149
	150	if (p->state == GMON_PROF_ERROR)
	151	ERR("_mcleanup: tos overflow\n");
	152
	153	size = sizeof(clockinfo);
	154	mib[0] = CTL_KERN;
	155	mib[1] = KERN_CLOCKRATE;
	156	if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
	157	/*
	158	* Best guess
	159	*/
	160	clockinfo.profhz = hertz();
	161	} else if (clockinfo.profhz == 0) {
	162	if (clockinfo.hz != 0)
	163	clockinfo.profhz = clockinfo.hz;
	164	else
	165	clockinfo.profhz = hertz();
	166	}
	167
	168	moncontrol(0);
215fdc4a	169	snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
984263bc MD	170	fd = _open(outname, O_CREAT\|O_TRUNC\|O_WRONLY, 0666);
984263bc MD	171	if (fd < 0) {
215fdc4a	172	_warn("_mcleanup: %s", outname);
984263bc MD	173	return;
	174	}
	175	#ifdef DEBUG
	176	log = _open("gmon.log", O_CREAT\|O_TRUNC\|O_WRONLY, 0664);
	177	if (log < 0) {
215fdc4a	178	_warn("_mcleanup: gmon.log");
984263bc MD	179	return;
984263bc MD	180	}
215fdc4a	181	len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
984263bc MD	182	p->kcount, p->kcountsize);
	183	_write(log, buf, len);
	184	#endif
	185	hdr = (struct gmonhdr *)&gmonhdr;
215fdc4a	186	bzero(hdr, sizeof(*hdr));
984263bc MD	187	hdr->lpc = p->lowpc;
	188	hdr->hpc = p->highpc;
	189	hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
	190	hdr->version = GMONVERSION;
	191	hdr->profrate = clockinfo.profhz;
	192	_write(fd, (char )hdr, sizeof hdr);
	193	_write(fd, p->kcount, p->kcountsize);
	194	endfrom = p->fromssize / sizeof(*p->froms);
	195	for (fromindex = 0; fromindex < endfrom; fromindex++) {
	196	if (p->froms[fromindex] == 0)
	197	continue;
	198
	199	frompc = p->lowpc;
	200	frompc += fromindex * p->hashfraction * sizeof(*p->froms);
	201	for (toindex = p->froms[fromindex]; toindex != 0;
	202	toindex = p->tos[toindex].link) {
	203	#ifdef DEBUG
	204	len = sprintf(buf,
215fdc4a	205	"[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
984263bc MD	206	frompc, p->tos[toindex].selfpc,
	207	p->tos[toindex].count);
	208	_write(log, buf, len);
	209	#endif
	210	rawarc.raw_frompc = frompc;
	211	rawarc.raw_selfpc = p->tos[toindex].selfpc;
	212	rawarc.raw_count = p->tos[toindex].count;
	213	_write(fd, &rawarc, sizeof rawarc);
	214	}
	215	}
	216	_close(fd);
	217	}
	218
	219	/*
	220	* Control profiling
	221	* profiling is what mcount checks to see if
	222	* all the data structures are ready.
	223	*/
	224	void
5556e324	225	moncontrol(int mode)
984263bc MD	226	{
	227	struct gmonparam *p = &_gmonparam;
	228
	229	if (mode) {
	230	/* start */
	231	profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
	232	p->state = GMON_PROF_ON;
	233	} else {
	234	/* stop */
60233e58	235	profil(NULL, 0, 0, 0);
984263bc MD	236	p->state = GMON_PROF_OFF;
	237	}
	238	}
	239
	240	/*
	241	* discover the tick frequency of the machine
	242	* if something goes wrong, we return 0, an impossible hertz.
	243	*/
	244	static int
5556e324	245	hertz(void)
984263bc MD	246	{
	247	struct itimerval tim;
	248
	249	tim.it_interval.tv_sec = 0;
	250	tim.it_interval.tv_usec = 1;
	251	tim.it_value.tv_sec = 0;
	252	tim.it_value.tv_usec = 0;
	253	setitimer(ITIMER_REAL, &tim, 0);
	254	setitimer(ITIMER_REAL, 0, &tim);
	255	if (tim.it_interval.tv_usec < 2)
	256	return(0);
	257	return (1000000 / tim.it_interval.tv_usec);
	258	}