1 /*-
2 * Copyright (c) 1983, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 * 4. 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.
16 *
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
27 * SUCH DAMAGE.
28 */
29
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
32 #endif
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: stable/9/lib/libc/gmon/gmon.c 235082 2012-05-06 14:10:56Z eadler $");
35
36 #include "namespace.h"
37 #include <sys/param.h>
38 #include <sys/time.h>
39 #include <sys/gmon.h>
40 #include <sys/sysctl.h>
41
42 #include <err.h>
43 #include <fcntl.h>
44 #include <inttypes.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49 #include "un-namespace.h"
50
51 #include "libc_private.h"
52
53 #if defined(__i386__) || defined(__sparc64__) || defined(__amd64__) || (defined(__powerpc__) && !defined(__powerpc64__))
54 extern char *minbrk __asm (".minbrk");
55 #elif defined(__powerpc64__)
56 extern char *minbrk __asm ("_minbrk");
57 #else
58 extern char *minbrk __asm ("minbrk");
59 #endif
60
61 struct gmonparam _gmonparam = { GMON_PROF_OFF };
62
63 static int s_scale;
64 /* See profil(2) where this is described (incorrectly). */
65 #define SCALE_SHIFT 16
66
67 #define ERR(s) _write(2, s, sizeof(s))
68
69 void moncontrol(int);
70 static int hertz(void);
71
72 void
monstartup(lowpc,highpc)73 monstartup(lowpc, highpc)
74 u_long lowpc;
75 u_long highpc;
76 {
77 int o;
78 char *cp;
79 struct gmonparam *p = &_gmonparam;
80
81 /*
82 * round lowpc and highpc to multiples of the density we're using
83 * so the rest of the scaling (here and in gprof) stays in ints.
84 */
85 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
86 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
87 p->textsize = p->highpc - p->lowpc;
88 p->kcountsize = p->textsize / HISTFRACTION;
89 p->hashfraction = HASHFRACTION;
90 p->fromssize = p->textsize / HASHFRACTION;
91 p->tolimit = p->textsize * ARCDENSITY / 100;
92 if (p->tolimit < MINARCS)
93 p->tolimit = MINARCS;
94 else if (p->tolimit > MAXARCS)
95 p->tolimit = MAXARCS;
96 p->tossize = p->tolimit * sizeof(struct tostruct);
97
98 cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
99 if (cp == (char *)-1) {
100 ERR("monstartup: out of memory\n");
101 return;
102 }
103 #ifdef notdef
104 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
105 #endif
106 p->tos = (struct tostruct *)cp;
107 cp += p->tossize;
108 p->kcount = (u_short *)cp;
109 cp += p->kcountsize;
110 p->froms = (u_short *)cp;
111
112 minbrk = sbrk(0);
113 p->tos[0].link = 0;
114
115 o = p->highpc - p->lowpc;
116 s_scale = (p->kcountsize < o) ?
117 ((uintmax_t)p->kcountsize << SCALE_SHIFT) / o : (1 << SCALE_SHIFT);
118 moncontrol(1);
119 }
120
121 void
_mcleanup(void)122 _mcleanup(void)
123 {
124 int fd;
125 int fromindex;
126 int endfrom;
127 u_long frompc;
128 int toindex;
129 struct rawarc rawarc;
130 struct gmonparam *p = &_gmonparam;
131 struct gmonhdr gmonhdr, *hdr;
132 struct clockinfo clockinfo;
133 char outname[128];
134 int mib[2];
135 size_t size;
136 #ifdef DEBUG
137 int log, len;
138 char buf[200];
139 #endif
140
141 if (p->state == GMON_PROF_ERROR)
142 ERR("_mcleanup: tos overflow\n");
143
144 size = sizeof(clockinfo);
145 mib[0] = CTL_KERN;
146 mib[1] = KERN_CLOCKRATE;
147 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
148 /*
149 * Best guess
150 */
151 clockinfo.profhz = hertz();
152 } else if (clockinfo.profhz == 0) {
153 if (clockinfo.hz != 0)
154 clockinfo.profhz = clockinfo.hz;
155 else
156 clockinfo.profhz = hertz();
157 }
158
159 moncontrol(0);
160 if (getenv("PROFIL_USE_PID"))
161 snprintf(outname, sizeof(outname), "%s.%d.gmon",
162 _getprogname(), getpid());
163 else
164 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
165
166 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666);
167 if (fd < 0) {
168 _warn("_mcleanup: %s", outname);
169 return;
170 }
171 #ifdef DEBUG
172 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
173 if (log < 0) {
174 _warn("_mcleanup: gmon.log");
175 return;
176 }
177 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
178 p->kcount, p->kcountsize);
179 _write(log, buf, len);
180 #endif
181 hdr = (struct gmonhdr *)&gmonhdr;
182 bzero(hdr, sizeof(*hdr));
183 hdr->lpc = p->lowpc;
184 hdr->hpc = p->highpc;
185 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
186 hdr->version = GMONVERSION;
187 hdr->profrate = clockinfo.profhz;
188 _write(fd, (char *)hdr, sizeof *hdr);
189 _write(fd, p->kcount, p->kcountsize);
190 endfrom = p->fromssize / sizeof(*p->froms);
191 for (fromindex = 0; fromindex < endfrom; fromindex++) {
192 if (p->froms[fromindex] == 0)
193 continue;
194
195 frompc = p->lowpc;
196 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
197 for (toindex = p->froms[fromindex]; toindex != 0;
198 toindex = p->tos[toindex].link) {
199 #ifdef DEBUG
200 len = sprintf(buf,
201 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
202 frompc, p->tos[toindex].selfpc,
203 p->tos[toindex].count);
204 _write(log, buf, len);
205 #endif
206 rawarc.raw_frompc = frompc;
207 rawarc.raw_selfpc = p->tos[toindex].selfpc;
208 rawarc.raw_count = p->tos[toindex].count;
209 _write(fd, &rawarc, sizeof rawarc);
210 }
211 }
212 _close(fd);
213 }
214
215 /*
216 * Control profiling
217 * profiling is what mcount checks to see if
218 * all the data structures are ready.
219 */
220 void
moncontrol(mode)221 moncontrol(mode)
222 int mode;
223 {
224 struct gmonparam *p = &_gmonparam;
225
226 if (mode) {
227 /* start */
228 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
229 p->state = GMON_PROF_ON;
230 } else {
231 /* stop */
232 profil((char *)0, 0, 0, 0);
233 p->state = GMON_PROF_OFF;
234 }
235 }
236
237 /*
238 * discover the tick frequency of the machine
239 * if something goes wrong, we return 0, an impossible hertz.
240 */
241 static int
hertz()242 hertz()
243 {
244 struct itimerval tim;
245
246 tim.it_interval.tv_sec = 0;
247 tim.it_interval.tv_usec = 1;
248 tim.it_value.tv_sec = 0;
249 tim.it_value.tv_usec = 0;
250 setitimer(ITIMER_REAL, &tim, 0);
251 setitimer(ITIMER_REAL, 0, &tim);
252 if (tim.it_interval.tv_usec < 2)
253 return(0);
254 return (1000000 / tim.it_interval.tv_usec);
255 }
256