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gmon.c revision 1.4
      1 /*	$NetBSD: gmon.c,v 1.4 1995/11/04 00:11:40 cgd Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1983, 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if !defined(lint) && defined(LIBC_SCCS)
     37 #if 0
     38 static char sccsid[] = "@(#)gmon.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: gmon.c,v 1.4 1995/11/04 00:11:40 cgd Exp $";
     41 #endif
     42 #endif
     43 
     44 #include <sys/param.h>
     45 #include <sys/time.h>
     46 #include <sys/gmon.h>
     47 #include <sys/sysctl.h>
     48 
     49 #include <stdio.h>
     50 #include <fcntl.h>
     51 #include <unistd.h>
     52 
     53 extern char *minbrk asm ("minbrk");
     54 
     55 struct gmonparam _gmonparam = { GMON_PROF_OFF };
     56 
     57 static int	s_scale;
     58 /* see profil(2) where this is describe (incorrectly) */
     59 #define		SCALE_1_TO_1	0x10000L
     60 
     61 #define ERR(s) write(2, s, sizeof(s))
     62 
     63 void	moncontrol __P((int));
     64 static int hertz __P((void));
     65 
     66 void
     67 monstartup(lowpc, highpc)
     68 	u_long lowpc;
     69 	u_long highpc;
     70 {
     71 	register int o;
     72 	char *cp;
     73 	struct gmonparam *p = &_gmonparam;
     74 
     75 	/*
     76 	 * round lowpc and highpc to multiples of the density we're using
     77 	 * so the rest of the scaling (here and in gprof) stays in ints.
     78 	 */
     79 	p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
     80 	p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
     81 	p->textsize = p->highpc - p->lowpc;
     82 	p->kcountsize = p->textsize / HISTFRACTION;
     83 	p->hashfraction = HASHFRACTION;
     84 	p->fromssize = p->textsize / HASHFRACTION;
     85 	p->tolimit = p->textsize * ARCDENSITY / 100;
     86 	if (p->tolimit < MINARCS)
     87 		p->tolimit = MINARCS;
     88 	else if (p->tolimit > MAXARCS)
     89 		p->tolimit = MAXARCS;
     90 	p->tossize = p->tolimit * sizeof(struct tostruct);
     91 
     92 	cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
     93 	if (cp == (char *)-1) {
     94 		ERR("monstartup: out of memory\n");
     95 		return;
     96 	}
     97 #ifdef notdef
     98 	bzero(cp, p->kcountsize + p->fromssize + p->tossize);
     99 #endif
    100 	p->tos = (struct tostruct *)cp;
    101 	cp += p->tossize;
    102 	p->kcount = (u_short *)cp;
    103 	cp += p->kcountsize;
    104 	p->froms = (u_short *)cp;
    105 
    106 	minbrk = sbrk(0);
    107 	p->tos[0].link = 0;
    108 
    109 	o = p->highpc - p->lowpc;
    110 	if (p->kcountsize < o) {
    111 #ifndef notdef
    112 		s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
    113 #else /* avoid floating point */
    114 		int quot = o / p->kcountsize;
    115 
    116 		if (quot >= 0x10000)
    117 			s_scale = 1;
    118 		else if (quot >= 0x100)
    119 			s_scale = 0x10000 / quot;
    120 		else if (o >= 0x800000)
    121 			s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
    122 		else
    123 			s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
    124 #endif
    125 	} else
    126 		s_scale = SCALE_1_TO_1;
    127 
    128 	moncontrol(1);
    129 }
    130 
    131 void
    132 _mcleanup()
    133 {
    134 	int fd;
    135 	int fromindex;
    136 	int endfrom;
    137 	u_long frompc;
    138 	int toindex;
    139 	struct rawarc rawarc;
    140 	struct gmonparam *p = &_gmonparam;
    141 	struct gmonhdr gmonhdr, *hdr;
    142 	struct clockinfo clockinfo;
    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);
    169 	fd = open("gmon.out", O_CREAT|O_TRUNC|O_WRONLY, 0666);
    170 	if (fd < 0) {
    171 		perror("mcount: gmon.out");
    172 		return;
    173 	}
    174 #ifdef DEBUG
    175 	log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
    176 	if (log < 0) {
    177 		perror("mcount: gmon.log");
    178 		return;
    179 	}
    180 	len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n",
    181 	    p->kcount, p->kcountsize);
    182 	write(log, buf, len);
    183 #endif
    184 	hdr = (struct gmonhdr *)&gmonhdr;
    185 	hdr->lpc = p->lowpc;
    186 	hdr->hpc = p->highpc;
    187 	hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
    188 	hdr->version = GMONVERSION;
    189 	hdr->profrate = clockinfo.profhz;
    190 	write(fd, (char *)hdr, sizeof *hdr);
    191 	write(fd, p->kcount, p->kcountsize);
    192 	endfrom = p->fromssize / sizeof(*p->froms);
    193 	for (fromindex = 0; fromindex < endfrom; fromindex++) {
    194 		if (p->froms[fromindex] == 0)
    195 			continue;
    196 
    197 		frompc = p->lowpc;
    198 		frompc += fromindex * p->hashfraction * sizeof(*p->froms);
    199 		for (toindex = p->froms[fromindex]; toindex != 0;
    200 		     toindex = p->tos[toindex].link) {
    201 #ifdef DEBUG
    202 			len = sprintf(buf,
    203 			"[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" ,
    204 				frompc, p->tos[toindex].selfpc,
    205 				p->tos[toindex].count);
    206 			write(log, buf, len);
    207 #endif
    208 			rawarc.raw_frompc = frompc;
    209 			rawarc.raw_selfpc = p->tos[toindex].selfpc;
    210 			rawarc.raw_count = p->tos[toindex].count;
    211 			write(fd, &rawarc, sizeof rawarc);
    212 		}
    213 	}
    214 	close(fd);
    215 }
    216 
    217 /*
    218  * Control profiling
    219  *	profiling is what mcount checks to see if
    220  *	all the data structures are ready.
    221  */
    222 void
    223 moncontrol(mode)
    224 	int mode;
    225 {
    226 	struct gmonparam *p = &_gmonparam;
    227 
    228 	if (mode) {
    229 		/* start */
    230 		profil((char *)p->kcount, p->kcountsize, p->lowpc,
    231 		    s_scale);
    232 		p->state = GMON_PROF_ON;
    233 	} else {
    234 		/* stop */
    235 		profil((char *)0, 0, 0, 0);
    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
    245 hertz()
    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 }
    259 
    260 
    261