2 * SPDX-License-Identifier: BSD-3-Clause
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32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include "namespace.h"
39 #include <sys/param.h>
43 #include <sys/sysctl.h>
52 #include "un-namespace.h"
54 #include "libc_private.h"
56 struct gmonparam _gmonparam = { GMON_PROF_OFF };
59 /* See profil(2) where this is described (incorrectly). */
60 #define SCALE_SHIFT 16
62 #define ERR(s) _write(2, s, sizeof(s))
65 static int hertz(void);
69 monstartup(u_long lowpc, u_long highpc)
73 struct gmonparam *p = &_gmonparam;
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.
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)
88 else if (p->tolimit > MAXARCS)
90 p->tossize = p->tolimit * sizeof(struct tostruct);
92 cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize,
93 PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
94 if (cp == MAP_FAILED) {
95 ERR("monstartup: out of memory\n");
99 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
101 p->tos = (struct tostruct *)cp;
103 p->kcount = (u_short *)cp;
105 p->froms = (u_short *)cp;
109 o = p->highpc - p->lowpc;
110 s_scale = (p->kcountsize < o) ?
111 ((uintmax_t)p->kcountsize << SCALE_SHIFT) / o : (1 << SCALE_SHIFT);
123 struct rawarc rawarc;
124 struct gmonparam *p = &_gmonparam;
125 struct gmonhdr gmonhdr, *hdr;
126 struct clockinfo clockinfo;
135 if (p->state == GMON_PROF_ERROR)
136 ERR("_mcleanup: tos overflow\n");
138 size = sizeof(clockinfo);
140 mib[1] = KERN_CLOCKRATE;
141 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
145 clockinfo.profhz = hertz();
146 } else if (clockinfo.profhz == 0) {
147 if (clockinfo.hz != 0)
148 clockinfo.profhz = clockinfo.hz;
150 clockinfo.profhz = hertz();
154 if (getenv("PROFIL_USE_PID"))
155 snprintf(outname, sizeof(outname), "%s.%d.gmon",
156 _getprogname(), getpid());
158 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
160 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666);
162 _warn("_mcleanup: %s", outname);
166 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664);
168 _warn("_mcleanup: gmon.log");
171 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
172 p->kcount, p->kcountsize);
173 _write(log, buf, len);
175 hdr = (struct gmonhdr *)&gmonhdr;
176 bzero(hdr, sizeof(*hdr));
178 hdr->hpc = p->highpc;
179 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
180 hdr->version = GMONVERSION;
181 hdr->profrate = clockinfo.profhz;
182 _write(fd, (char *)hdr, sizeof *hdr);
183 _write(fd, p->kcount, p->kcountsize);
184 endfrom = p->fromssize / sizeof(*p->froms);
185 for (fromindex = 0; fromindex < endfrom; fromindex++) {
186 if (p->froms[fromindex] == 0)
190 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
191 for (toindex = p->froms[fromindex]; toindex != 0;
192 toindex = p->tos[toindex].link) {
195 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
196 frompc, p->tos[toindex].selfpc,
197 p->tos[toindex].count);
198 _write(log, buf, len);
200 rawarc.raw_frompc = frompc;
201 rawarc.raw_selfpc = p->tos[toindex].selfpc;
202 rawarc.raw_count = p->tos[toindex].count;
203 _write(fd, &rawarc, sizeof rawarc);
211 * profiling is what mcount checks to see if
212 * all the data structures are ready.
217 struct gmonparam *p = &_gmonparam;
221 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
222 p->state = GMON_PROF_ON;
225 profil((char *)0, 0, 0, 0);
226 p->state = GMON_PROF_OFF;
231 * discover the tick frequency of the machine
232 * if something goes wrong, we return 0, an impossible hertz.
237 struct itimerval tim;
239 tim.it_interval.tv_sec = 0;
240 tim.it_interval.tv_usec = 1;
241 tim.it_value.tv_sec = 0;
242 tim.it_value.tv_usec = 0;
243 setitimer(ITIMER_REAL, &tim, 0);
244 setitimer(ITIMER_REAL, 0, &tim);
245 if (tim.it_interval.tv_usec < 2)
247 return (1000000 / tim.it_interval.tv_usec);