2 * Copyright (c) 1983, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/param.h>
40 #include <sys/sysctl.h>
48 #include "un-namespace.h"
50 #include "libc_private.h"
52 #if defined(__i386__) || defined(__sparc64__) || defined(__amd64__) || defined(__powerpc__)
53 extern char *minbrk __asm (".minbrk");
55 extern char *minbrk __asm ("minbrk");
58 struct gmonparam _gmonparam = { GMON_PROF_OFF };
61 /* see profil(2) where this is describe (incorrectly) */
62 #define SCALE_1_TO_1 0x10000L
64 #define ERR(s) _write(2, s, sizeof(s))
67 static int hertz(void);
70 monstartup(lowpc, highpc)
76 struct gmonparam *p = &_gmonparam;
79 * round lowpc and highpc to multiples of the density we're using
80 * so the rest of the scaling (here and in gprof) stays in ints.
82 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
83 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
84 p->textsize = p->highpc - p->lowpc;
85 p->kcountsize = p->textsize / HISTFRACTION;
86 p->hashfraction = HASHFRACTION;
87 p->fromssize = p->textsize / HASHFRACTION;
88 p->tolimit = p->textsize * ARCDENSITY / 100;
89 if (p->tolimit < MINARCS)
91 else if (p->tolimit > MAXARCS)
93 p->tossize = p->tolimit * sizeof(struct tostruct);
95 cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
96 if (cp == (char *)-1) {
97 ERR("monstartup: out of memory\n");
101 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
103 p->tos = (struct tostruct *)cp;
105 p->kcount = (u_short *)cp;
107 p->froms = (u_short *)cp;
112 o = p->highpc - p->lowpc;
113 if (p->kcountsize < o) {
115 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
116 #else /* avoid floating point */
117 int quot = o / p->kcountsize;
121 else if (quot >= 0x100)
122 s_scale = 0x10000 / quot;
123 else if (o >= 0x800000)
124 s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
126 s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
129 s_scale = SCALE_1_TO_1;
142 struct rawarc rawarc;
143 struct gmonparam *p = &_gmonparam;
144 struct gmonhdr gmonhdr, *hdr;
145 struct clockinfo clockinfo;
154 if (p->state == GMON_PROF_ERROR)
155 ERR("_mcleanup: tos overflow\n");
157 size = sizeof(clockinfo);
159 mib[1] = KERN_CLOCKRATE;
160 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
164 clockinfo.profhz = hertz();
165 } else if (clockinfo.profhz == 0) {
166 if (clockinfo.hz != 0)
167 clockinfo.profhz = clockinfo.hz;
169 clockinfo.profhz = hertz();
173 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
174 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666);
176 _warn("_mcleanup: %s", outname);
180 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
182 _warn("_mcleanup: gmon.log");
185 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
186 p->kcount, p->kcountsize);
187 _write(log, buf, len);
189 hdr = (struct gmonhdr *)&gmonhdr;
190 bzero(hdr, sizeof(*hdr));
192 hdr->hpc = p->highpc;
193 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
194 hdr->version = GMONVERSION;
195 hdr->profrate = clockinfo.profhz;
196 _write(fd, (char *)hdr, sizeof *hdr);
197 _write(fd, p->kcount, p->kcountsize);
198 endfrom = p->fromssize / sizeof(*p->froms);
199 for (fromindex = 0; fromindex < endfrom; fromindex++) {
200 if (p->froms[fromindex] == 0)
204 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
205 for (toindex = p->froms[fromindex]; toindex != 0;
206 toindex = p->tos[toindex].link) {
209 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
210 frompc, p->tos[toindex].selfpc,
211 p->tos[toindex].count);
212 _write(log, buf, len);
214 rawarc.raw_frompc = frompc;
215 rawarc.raw_selfpc = p->tos[toindex].selfpc;
216 rawarc.raw_count = p->tos[toindex].count;
217 _write(fd, &rawarc, sizeof rawarc);
225 * profiling is what mcount checks to see if
226 * all the data structures are ready.
232 struct gmonparam *p = &_gmonparam;
236 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
237 p->state = GMON_PROF_ON;
240 profil((char *)0, 0, 0, 0);
241 p->state = GMON_PROF_OFF;
246 * discover the tick frequency of the machine
247 * if something goes wrong, we return 0, an impossible hertz.
252 struct itimerval tim;
254 tim.it_interval.tv_sec = 0;
255 tim.it_interval.tv_usec = 1;
256 tim.it_value.tv_sec = 0;
257 tim.it_value.tv_usec = 0;
258 setitimer(ITIMER_REAL, &tim, 0);
259 setitimer(ITIMER_REAL, 0, &tim);
260 if (tim.it_interval.tv_usec < 2)
262 return (1000000 / tim.it_interval.tv_usec);