gmon.c revision 88607
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: head/lib/libc/gmon/gmon.c 88607 2001-12-29 06:35:19Z jake $ 34 */ 35 36#if !defined(lint) && defined(LIBC_SCCS) 37static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93"; 38#endif 39 40#include "namespace.h" 41#include <sys/param.h> 42#include <sys/time.h> 43#include <sys/gmon.h> 44#include <sys/sysctl.h> 45 46#include <err.h> 47#include <errno.h> 48#include <stdio.h> 49#include <fcntl.h> 50#include <string.h> 51#include <unistd.h> 52#include "un-namespace.h" 53 54#if defined(__ELF__) && (defined(i386) || defined(__sparc64__)) 55extern char *minbrk asm (".minbrk"); 56#else 57extern char *minbrk asm ("minbrk"); 58#endif 59 60extern char *__progname; 61 62struct gmonparam _gmonparam = { GMON_PROF_OFF }; 63 64static int s_scale; 65/* see profil(2) where this is describe (incorrectly) */ 66#define SCALE_1_TO_1 0x10000L 67 68#define ERR(s) _write(2, s, sizeof(s)) 69 70void moncontrol __P((int)); 71static int hertz __P((void)); 72 73void 74monstartup(lowpc, highpc) 75 u_long lowpc; 76 u_long highpc; 77{ 78 register int o; 79 char *cp; 80 struct gmonparam *p = &_gmonparam; 81 82 /* 83 * round lowpc and highpc to multiples of the density we're using 84 * so the rest of the scaling (here and in gprof) stays in ints. 85 */ 86 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 87 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 88 p->textsize = p->highpc - p->lowpc; 89 p->kcountsize = p->textsize / HISTFRACTION; 90 p->hashfraction = HASHFRACTION; 91 p->fromssize = p->textsize / HASHFRACTION; 92 p->tolimit = p->textsize * ARCDENSITY / 100; 93 if (p->tolimit < MINARCS) 94 p->tolimit = MINARCS; 95 else if (p->tolimit > MAXARCS) 96 p->tolimit = MAXARCS; 97 p->tossize = p->tolimit * sizeof(struct tostruct); 98 99 cp = sbrk(p->kcountsize + p->fromssize + p->tossize); 100 if (cp == (char *)-1) { 101 ERR("monstartup: out of memory\n"); 102 return; 103 } 104#ifdef notdef 105 bzero(cp, p->kcountsize + p->fromssize + p->tossize); 106#endif 107 p->tos = (struct tostruct *)cp; 108 cp += p->tossize; 109 p->kcount = (u_short *)cp; 110 cp += p->kcountsize; 111 p->froms = (u_short *)cp; 112 113 minbrk = sbrk(0); 114 p->tos[0].link = 0; 115 116 o = p->highpc - p->lowpc; 117 if (p->kcountsize < o) { 118#ifndef hp300 119 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 120#else /* avoid floating point */ 121 int quot = o / p->kcountsize; 122 123 if (quot >= 0x10000) 124 s_scale = 1; 125 else if (quot >= 0x100) 126 s_scale = 0x10000 / quot; 127 else if (o >= 0x800000) 128 s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); 129 else 130 s_scale = 0x1000000 / ((o << 8) / p->kcountsize); 131#endif 132 } else 133 s_scale = SCALE_1_TO_1; 134 135 moncontrol(1); 136} 137 138void 139_mcleanup() 140{ 141 int fd; 142 int fromindex; 143 int endfrom; 144 u_long frompc; 145 int toindex; 146 struct rawarc rawarc; 147 struct gmonparam *p = &_gmonparam; 148 struct gmonhdr gmonhdr, *hdr; 149 struct clockinfo clockinfo; 150 char outname[128]; 151 int mib[2]; 152 size_t size; 153#ifdef DEBUG 154 int log, len; 155 char buf[200]; 156#endif 157 158 if (p->state == GMON_PROF_ERROR) 159 ERR("_mcleanup: tos overflow\n"); 160 161 size = sizeof(clockinfo); 162 mib[0] = CTL_KERN; 163 mib[1] = KERN_CLOCKRATE; 164 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 165 /* 166 * Best guess 167 */ 168 clockinfo.profhz = hertz(); 169 } else if (clockinfo.profhz == 0) { 170 if (clockinfo.hz != 0) 171 clockinfo.profhz = clockinfo.hz; 172 else 173 clockinfo.profhz = hertz(); 174 } 175 176 moncontrol(0); 177 snprintf(outname,sizeof(outname),"%s.gmon",__progname); 178 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666); 179 if (fd < 0) { 180 warnx("_mcleanup: %s - %s",outname,strerror(errno)); 181 return; 182 } 183#ifdef DEBUG 184 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); 185 if (log < 0) { 186 perror("_mcleanup: gmon.log"); 187 return; 188 } 189 len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n", 190 p->kcount, p->kcountsize); 191 _write(log, buf, len); 192#endif 193 hdr = (struct gmonhdr *)&gmonhdr; 194 hdr->lpc = p->lowpc; 195 hdr->hpc = p->highpc; 196 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 197 hdr->version = GMONVERSION; 198 hdr->profrate = clockinfo.profhz; 199 _write(fd, (char *)hdr, sizeof *hdr); 200 _write(fd, p->kcount, p->kcountsize); 201 endfrom = p->fromssize / sizeof(*p->froms); 202 for (fromindex = 0; fromindex < endfrom; fromindex++) { 203 if (p->froms[fromindex] == 0) 204 continue; 205 206 frompc = p->lowpc; 207 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 208 for (toindex = p->froms[fromindex]; toindex != 0; 209 toindex = p->tos[toindex].link) { 210#ifdef DEBUG 211 len = sprintf(buf, 212 "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" , 213 frompc, p->tos[toindex].selfpc, 214 p->tos[toindex].count); 215 _write(log, buf, len); 216#endif 217 rawarc.raw_frompc = frompc; 218 rawarc.raw_selfpc = p->tos[toindex].selfpc; 219 rawarc.raw_count = p->tos[toindex].count; 220 _write(fd, &rawarc, sizeof rawarc); 221 } 222 } 223 _close(fd); 224} 225 226/* 227 * Control profiling 228 * profiling is what mcount checks to see if 229 * all the data structures are ready. 230 */ 231void 232moncontrol(mode) 233 int mode; 234{ 235 struct gmonparam *p = &_gmonparam; 236 237 if (mode) { 238 /* start */ 239 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 240 p->state = GMON_PROF_ON; 241 } else { 242 /* stop */ 243 profil((char *)0, 0, 0, 0); 244 p->state = GMON_PROF_OFF; 245 } 246} 247 248/* 249 * discover the tick frequency of the machine 250 * if something goes wrong, we return 0, an impossible hertz. 251 */ 252static int 253hertz() 254{ 255 struct itimerval tim; 256 257 tim.it_interval.tv_sec = 0; 258 tim.it_interval.tv_usec = 1; 259 tim.it_value.tv_sec = 0; 260 tim.it_value.tv_usec = 0; 261 setitimer(ITIMER_REAL, &tim, 0); 262 setitimer(ITIMER_REAL, 0, &tim); 263 if (tim.it_interval.tv_usec < 2) 264 return(0); 265 return (1000000 / tim.it_interval.tv_usec); 266} 267