1 /* $NetBSD: gmon.c,v 1.15 1999/01/14 22:48:19 kleink 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 #include <sys/cdefs.h> 37 #if !defined(lint) && defined(LIBC_SCCS) 38 #if 0 39 static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: gmon.c,v 1.15 1999/01/14 22:48:19 kleink Exp $"); 42 #endif 43 #endif 44 45 #include "namespace.h" 46 #include <sys/param.h> 47 #include <sys/time.h> 48 #include <sys/gmon.h> 49 #include <sys/sysctl.h> 50 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <fcntl.h> 54 #include <limits.h> 55 #include <unistd.h> 56 #include <err.h> 57 #include "extern.h" 58 59 struct gmonparam _gmonparam = { GMON_PROF_OFF }; 60 61 static u_int s_scale; 62 /* see profil(2) where this is describe (incorrectly) */ 63 #define SCALE_1_TO_1 0x10000L 64 65 #define ERR(s) write(STDERR_FILENO, s, sizeof(s)) 66 67 void moncontrol __P((int)); 68 void monstartup __P((u_long, u_long)); 69 void _mcleanup __P((void)); 70 static int hertz __P((void)); 71 72 void 73 monstartup(lowpc, highpc) 74 u_long lowpc; 75 u_long highpc; 76 { 77 long 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 / p->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((int)(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 memset(cp, 0, p->kcountsize + p->fromssize + p->tossize); 105 #endif 106 p->tos = (struct tostruct *)(void *)cp; 107 cp += (size_t)p->tossize; 108 p->kcount = (u_short *)(void *)cp; 109 cp += (size_t)p->kcountsize; 110 p->froms = (u_short *)(void *)cp; 111 112 __minbrk = sbrk(0); 113 p->tos[0].link = 0; 114 115 o = p->highpc - p->lowpc; 116 if (p->kcountsize < o) { 117 #ifndef notdef 118 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 119 #else /* avoid floating point */ 120 int quot = o / p->kcountsize; 121 122 if (quot >= 0x10000) 123 s_scale = 1; 124 else if (quot >= 0x100) 125 s_scale = 0x10000 / quot; 126 else if (o >= 0x800000) 127 s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); 128 else 129 s_scale = 0x1000000 / ((o << 8) / p->kcountsize); 130 #endif 131 } else 132 s_scale = SCALE_1_TO_1; 133 134 moncontrol(1); 135 } 136 137 void 138 _mcleanup() 139 { 140 int fd; 141 int fromindex; 142 int endfrom; 143 u_long frompc; 144 int toindex; 145 struct rawarc rawarc; 146 struct gmonparam *p = &_gmonparam; 147 struct gmonhdr gmonhdr, *hdr; 148 struct clockinfo clockinfo; 149 int mib[2]; 150 size_t size; 151 char *profdir; 152 char *proffile; 153 char buf[PATH_MAX]; 154 int len = sizeof(buf) - 1; 155 #ifdef DEBUG 156 int log, len; 157 char buf2[200]; 158 #endif 159 160 if (p->state == GMON_PROF_ERROR) 161 ERR("_mcleanup: tos overflow\n"); 162 163 size = sizeof(clockinfo); 164 mib[0] = CTL_KERN; 165 mib[1] = KERN_CLOCKRATE; 166 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 167 /* 168 * Best guess 169 */ 170 clockinfo.profhz = hertz(); 171 } else if (clockinfo.profhz == 0) { 172 if (clockinfo.hz != 0) 173 clockinfo.profhz = clockinfo.hz; 174 else 175 clockinfo.profhz = hertz(); 176 } 177 178 moncontrol(0); 179 180 if ((profdir = getenv("PROFDIR")) != NULL) { 181 extern char *__progname; 182 char *s, *t; 183 pid_t pid; 184 long divisor; 185 186 /* If PROFDIR contains a null value, no profiling 187 output is produced */ 188 if (*profdir == '\0') { 189 return; 190 } 191 192 t = buf; 193 s = profdir; 194 while ((*t = *s) != '\0') { 195 if (len-- == 0) { 196 warnx("_mcleanup: internal buffer overflow, PROFDIR too long"); 197 return; 198 } 199 t++; 200 s++; 201 } 202 *t++ = '/'; 203 204 /* 205 * Copy and convert pid from a pid_t to a string. For 206 * best performance, divisor should be initialized to 207 * the largest power of 10 less than PID_MAX. 208 */ 209 pid = getpid(); 210 divisor=10000; 211 while (divisor > pid) divisor /= 10; /* skip leading zeros */ 212 do { 213 *t++ = (char)((pid/divisor) + '0'); 214 pid %= (pid_t)divisor; 215 } while (divisor /= 10); 216 *t++ = '.'; 217 218 s = __progname; 219 while ((*t++ = *s++) != '\0') 220 ; 221 222 proffile = buf; 223 } else { 224 proffile = "gmon.out"; 225 } 226 227 fd = open(proffile , O_CREAT|O_TRUNC|O_WRONLY, 0666); 228 if (fd < 0) { 229 warn("mcount: Cannot open `%s'", proffile); 230 return; 231 } 232 #ifdef DEBUG 233 log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); 234 if (log < 0) { 235 warn("mcount: Cannot open `gmon.log'"); 236 return; 237 } 238 len = snprintf(buf2, sizeof buf2, "[mcleanup1] kcount 0x%x ssiz %d\n", 239 p->kcount, p->kcountsize); 240 write(log, buf2, len); 241 #endif 242 hdr = (struct gmonhdr *)&gmonhdr; 243 hdr->lpc = p->lowpc; 244 hdr->hpc = p->highpc; 245 hdr->ncnt = (int)(p->kcountsize + sizeof(gmonhdr)); 246 hdr->version = GMONVERSION; 247 hdr->profrate = clockinfo.profhz; 248 (void)write(fd, hdr, sizeof *hdr); 249 (void)write(fd, p->kcount, (size_t)p->kcountsize); 250 endfrom = (int)(p->fromssize / sizeof(*p->froms)); 251 for (fromindex = 0; fromindex < endfrom; fromindex++) { 252 if (p->froms[fromindex] == 0) 253 continue; 254 255 frompc = p->lowpc; 256 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 257 for (toindex = p->froms[fromindex]; toindex != 0; 258 toindex = p->tos[toindex].link) { 259 #ifdef DEBUG 260 len = snprintf(buf2, sizeof buf2, 261 "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" , 262 frompc, p->tos[toindex].selfpc, 263 p->tos[toindex].count); 264 write(log, buf2, len); 265 #endif 266 rawarc.raw_frompc = frompc; 267 rawarc.raw_selfpc = p->tos[toindex].selfpc; 268 rawarc.raw_count = p->tos[toindex].count; 269 write(fd, &rawarc, sizeof rawarc); 270 } 271 } 272 close(fd); 273 } 274 275 /* 276 * Control profiling 277 * profiling is what mcount checks to see if 278 * all the data structures are ready. 279 */ 280 void 281 moncontrol(mode) 282 int mode; 283 { 284 struct gmonparam *p = &_gmonparam; 285 286 if (mode) { 287 /* start */ 288 profil((char *)(void *)p->kcount, (size_t)p->kcountsize, 289 p->lowpc, s_scale); 290 p->state = GMON_PROF_ON; 291 } else { 292 /* stop */ 293 profil(NULL, 0, (u_long)0, 0); 294 p->state = GMON_PROF_OFF; 295 } 296 } 297 298 /* 299 * discover the tick frequency of the machine 300 * if something goes wrong, we return 0, an impossible hertz. 301 */ 302 static int 303 hertz() 304 { 305 struct itimerval tim; 306 307 tim.it_interval.tv_sec = 0; 308 tim.it_interval.tv_usec = 1; 309 tim.it_value.tv_sec = 0; 310 tim.it_value.tv_usec = 0; 311 setitimer(ITIMER_REAL, &tim, 0); 312 setitimer(ITIMER_REAL, 0, &tim); 313 if (tim.it_interval.tv_usec < 2) 314 return(0); 315 return (int)(1000000 / tim.it_interval.tv_usec); 316 } 317