2 * Copyright (c) 1983, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
13 * 3. 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.
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
29 * @(#)gmon.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gmon/gmon.c,v 1.22 2007/01/09 00:27:58 imp Exp $
33 #include "namespace.h"
34 #include <sys/param.h>
37 #include <sys/sysctl.h>
45 #include "un-namespace.h"
47 #include "libc_private.h"
49 #if defined(__i386__) || defined(__sparc64__) || defined(__x86_64__) || defined(__powerpc__)
50 extern char *minbrk __asm (".minbrk");
52 extern char *minbrk __asm ("minbrk");
55 struct gmonparam _gmonparam = { .state = GMON_PROF_OFF };
58 /* see profil(2) where this is describe (incorrectly) */
59 #define SCALE_1_TO_1 0x10000L
61 #define ERR(s) _write(2, s, sizeof(s))
64 static int hertz(void);
67 monstartup(u_long lowpc, u_long highpc)
71 struct gmonparam *p = &_gmonparam;
74 * round lowpc and highpc to multiples of the density we're using
75 * so the rest of the scaling (here and in gprof) stays in ints.
77 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
78 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
79 p->textsize = p->highpc - p->lowpc;
80 p->kcountsize = p->textsize / HISTFRACTION;
81 p->hashfraction = HASHFRACTION;
82 p->fromssize = p->textsize / HASHFRACTION;
83 p->tolimit = p->textsize * ARCDENSITY / 100;
84 if (p->tolimit < MINARCS)
86 else if (p->tolimit > MAXARCS)
88 p->tossize = p->tolimit * sizeof(struct tostruct);
90 cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
91 if (cp == (char *)-1) {
92 ERR("monstartup: out of memory\n");
96 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
98 p->tos = (struct tostruct *)cp;
100 p->kcount = (u_short *)cp;
102 p->froms = (u_short *)cp;
107 o = p->highpc - p->lowpc;
108 if (p->kcountsize < o) {
110 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
111 #else /* avoid floating point */
112 int quot = o / p->kcountsize;
116 else if (quot >= 0x100)
117 s_scale = 0x10000 / quot;
118 else if (o >= 0x800000)
119 s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
121 s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
124 s_scale = SCALE_1_TO_1;
137 struct rawarc rawarc;
138 struct gmonparam *p = &_gmonparam;
139 struct gmonhdr gmonhdr, *hdr;
140 struct clockinfo clockinfo;
149 if (p->state == GMON_PROF_ERROR)
150 ERR("_mcleanup: tos overflow\n");
152 size = sizeof(clockinfo);
154 mib[1] = KERN_CLOCKRATE;
155 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
159 clockinfo.profhz = hertz();
160 } else if (clockinfo.profhz == 0) {
161 if (clockinfo.hz != 0)
162 clockinfo.profhz = clockinfo.hz;
164 clockinfo.profhz = hertz();
168 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
169 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666);
171 _warn("_mcleanup: %s", outname);
175 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
177 _warn("_mcleanup: gmon.log");
180 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
181 p->kcount, p->kcountsize);
182 _write(log, buf, len);
184 hdr = (struct gmonhdr *)&gmonhdr;
185 bzero(hdr, sizeof(*hdr));
187 hdr->hpc = p->highpc;
188 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
189 hdr->version = GMONVERSION;
190 hdr->profrate = clockinfo.profhz;
191 _write(fd, (char *)hdr, sizeof *hdr);
192 _write(fd, p->kcount, p->kcountsize);
193 endfrom = p->fromssize / sizeof(*p->froms);
194 for (fromindex = 0; fromindex < endfrom; fromindex++) {
195 if (p->froms[fromindex] == 0)
199 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
200 for (toindex = p->froms[fromindex]; toindex != 0;
201 toindex = p->tos[toindex].link) {
204 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
205 frompc, p->tos[toindex].selfpc,
206 p->tos[toindex].count);
207 _write(log, buf, len);
209 rawarc.raw_frompc = frompc;
210 rawarc.raw_selfpc = p->tos[toindex].selfpc;
211 rawarc.raw_count = p->tos[toindex].count;
212 _write(fd, &rawarc, sizeof rawarc);
220 * profiling is what mcount checks to see if
221 * all the data structures are ready.
226 struct gmonparam *p = &_gmonparam;
230 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
231 p->state = GMON_PROF_ON;
234 profil(NULL, 0, 0, 0);
235 p->state = GMON_PROF_OFF;
240 * discover the tick frequency of the machine
241 * if something goes wrong, we return 0, an impossible hertz.
246 struct itimerval tim;
248 tim.it_interval.tv_sec = 0;
249 tim.it_interval.tv_usec = 1;
250 tim.it_value.tv_sec = 0;
251 tim.it_value.tv_usec = 0;
252 setitimer(ITIMER_REAL, &tim, 0);
253 setitimer(ITIMER_REAL, 0, &tim);
254 if (tim.it_interval.tv_usec < 2)
256 return (1000000 / tim.it_interval.tv_usec);