gmon.c

来自「基于组件方式开发操作系统的OSKIT源代码」· C语言 代码 · 共 338 行

/*
 * Copyright (c) 1998, 1999 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at [e-mail] or [phone].
 * 
 * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */
/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 */
#ifdef GPROF

#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)gmon.c	8.1 (Berkeley) 6/4/93";
#endif

#ifndef OSKIT
#include <sys/param.h>
#else
#include <oskit/time.h>
#endif
#include <sys/time.h>
#ifndef OSKIT
#include <sys/gmon.h>
#include <sys/sysctl.h>
#else
#include <oskit/c/sys/gmon.h>
#endif

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

#ifdef OSKIT
#include <stdlib.h>
#include <assert.h>
#include <oskit/dev/dev.h>
#include <oskit/x86/base_gdt.h>
#include <oskit/x86/base_idt.h>
#include <oskit/x86/base_trap.h>
#include <oskit/x86/pio.h>
#include <oskit/x86/proc_reg.h>
#include <oskit/x86/pc/base_irq.h>

#include <oskit/x86/pc/pit.h>
#include <oskit/x86/pc/pic.h>

#define u_long unsigned long
#define u_short unsigned short
#endif

#if defined(__ELF__)
extern char *minbrk asm (".minbrk");
#else
extern char *minbrk asm ("minbrk");
#endif

struct gmonparam _gmonparam = { GMON_PROF_OFF };
#ifdef OSKIT
int GPROF_ENABLED = 0;
#endif

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))

#ifdef OSKIT
void	moncontrol(int mode);
#else
void	moncontrol __P((int));
static int hertz __P((void));
#endif

void
monstartup(lowpc, highpc)
	u_long lowpc;
	u_long highpc;
{
	register 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);

#ifdef OSKIT
	cp = calloc(1, (p->kcountsize + p->fromssize + p->tossize));
	if (cp == NULL) {
#else
	cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
	if (cp == (char *)-1) {
#endif
		ERR("monstartup: out of memory\n");
		return;
	}

	p->tos = (struct tostruct *)cp;
	cp += p->tossize;
	p->kcount = (HISTCOUNTER *)cp;
	cp += p->kcountsize;
	p->froms = (u_short *)cp;

#ifndef OSKIT
	minbrk = sbrk(0);
#endif
	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()
{
	int fd;
	int fromindex;
	int endfrom;
	u_long frompc;
	int toindex;
	struct rawarc rawarc;
	struct gmonparam *p = &_gmonparam;
	struct gmonhdr gmonhdr, *hdr;
#ifndef OSKIT
	struct clockinfo clockinfo;
	int mib[2];
	size_t size;
#endif
#ifdef DEBUG
	int log, len;
	char buf[200];
#endif

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

#ifndef OSKIT
	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

	moncontrol(0);
	fd = open("gmon.out", O_CREAT|O_TRUNC|O_WRONLY, 0666);
	if (fd < 0) {
		perror("mcount: gmon.out");
		return;
	}
#ifdef OSKIT
	else {
		printf("Opened gmon.out successfully\n");
	}
#endif
#ifdef DEBUG
	log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
	if (log < 0) {
		perror("mcount: gmon.log");
		return;
	}
	len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n",
	    p->kcount, p->kcountsize);
	write(log, buf, len);
#endif
	hdr = (struct gmonhdr *)&gmonhdr;
	hdr->lpc = p->lowpc;
	hdr->hpc = p->highpc;
	hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
	hdr->version = GMONVERSION;
#ifdef OSKIT
	hdr->profrate = OSKIT_PROFHZ;
#else
	hdr->profrate = clockinfo.profhz;
#endif
	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 OSKIT
			assert(toindex < p->tolimit);
#endif
#ifdef DEBUG
			len = sprintf(buf,
			"[mcleanup2] frompc 0x%x selfpc 0x%x count %d\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);
		}
	}
#ifdef OSKIT
#ifdef DEBUG
	fsync(log);
	close(log);
#endif
	fsync(fd);
#endif
	close(fd);
}

/*
 * Control profiling
 *	profiling is what mcount checks to see if
 *	all the data structures are ready.
 */
void
moncontrol(mode)
	int mode;
{
	struct gmonparam *p = &_gmonparam;

	if (mode) {
		/* start */
		profil((char *)p->kcount, p->kcountsize, (int)p->lowpc,
		    s_scale);
		p->state = GMON_PROF_ON;
	} else {
		/* stop */
		profil((char *)0, 0, 0, 0);
		p->state = GMON_PROF_OFF;
	}
}

#ifndef OSKIT
/*
 * discover the tick frequency of the machine
 * if something goes wrong, we return 0, an impossible hertz.
 */
static int
hertz()
{
	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);
}
#endif
#endif	/* GPROF */