gmon.c revision 90046
190075Sobrien/*- 2169689Skan * Copyright (c) 1983, 1992, 1993 390075Sobrien * The Regents of the University of California. All rights reserved. 490075Sobrien * 5132718Skan * Redistribution and use in source and binary forms, with or without 690075Sobrien * modification, are permitted provided that the following conditions 7132718Skan * are met: 890075Sobrien * 1. Redistributions of source code must retain the above copyright 990075Sobrien * notice, this list of conditions and the following disclaimer. 1090075Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1190075Sobrien * notice, this list of conditions and the following disclaimer in the 12132718Skan * documentation and/or other materials provided with the distribution. 1390075Sobrien * 3. All advertising materials mentioning features or use of this software 1490075Sobrien * must display the following acknowledgement: 1590075Sobrien * This product includes software developed by the University of 1690075Sobrien * California, Berkeley and its contributors. 1790075Sobrien * 4. Neither the name of the University nor the names of its contributors 18132718Skan * may be used to endorse or promote products derived from this software 19169689Skan * without specific prior written permission. 20169689Skan * 2190075Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2290075Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2390075Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24132718Skan * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25132718Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2690075Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2790075Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2890075Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2990075Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30169689Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31169689Skan * SUCH DAMAGE. 3290075Sobrien */ 33169689Skan 3490075Sobrien#if !defined(lint) && defined(LIBC_SCCS) 35169689Skanstatic char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93"; 36169689Skan#endif 3790075Sobrien#include <sys/cdefs.h> 3890075Sobrien__FBSDID("$FreeBSD: head/lib/libc/gmon/gmon.c 90046 2002-02-01 01:39:09Z obrien $"); 3990075Sobrien 40169689Skan#include "namespace.h" 41169689Skan#include <sys/param.h> 4290075Sobrien#include <sys/time.h> 43169689Skan#include <sys/gmon.h> 44169689Skan#include <sys/sysctl.h> 4590075Sobrien 4690075Sobrien#include <err.h> 4790075Sobrien#include <errno.h> 48132718Skan#include <stdio.h> 49132718Skan#include <fcntl.h> 50169689Skan#include <string.h> 51169689Skan#include <unistd.h> 52169689Skan#include "un-namespace.h" 53169689Skan 5490075Sobrien#if defined(__ELF__) && (defined(i386) || defined(__sparc64__)) 5590075Sobrienextern char *minbrk asm (".minbrk"); 5690075Sobrien#else 5790075Sobrienextern char *minbrk asm ("minbrk"); 5890075Sobrien#endif 5990075Sobrien 6090075Sobrienextern char *__progname; 6190075Sobrien 6290075Sobrienstruct gmonparam _gmonparam = { GMON_PROF_OFF }; 6390075Sobrien 64132718Skanstatic int s_scale; 6590075Sobrien/* see profil(2) where this is describe (incorrectly) */ 66169689Skan#define SCALE_1_TO_1 0x10000L 6790075Sobrien 6890075Sobrien#define ERR(s) _write(2, s, sizeof(s)) 6990075Sobrien 7090075Sobrienvoid moncontrol(int); 7190075Sobrienstatic int hertz(void); 7290075Sobrien 7390075Sobrienvoid 7490075Sobrienmonstartup(lowpc, highpc) 7590075Sobrien u_long lowpc; 76132718Skan u_long highpc; 7790075Sobrien{ 7890075Sobrien int o; 7990075Sobrien char *cp; 8090075Sobrien struct gmonparam *p = &_gmonparam; 8190075Sobrien 8290075Sobrien /* 8390075Sobrien * round lowpc and highpc to multiples of the density we're using 8490075Sobrien * so the rest of the scaling (here and in gprof) stays in ints. 8590075Sobrien */ 8690075Sobrien p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 8790075Sobrien p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 8890075Sobrien p->textsize = p->highpc - p->lowpc; 8990075Sobrien p->kcountsize = p->textsize / HISTFRACTION; 9090075Sobrien p->hashfraction = HASHFRACTION; 9190075Sobrien p->fromssize = p->textsize / HASHFRACTION; 9290075Sobrien p->tolimit = p->textsize * ARCDENSITY / 100; 93132718Skan if (p->tolimit < MINARCS) 9490075Sobrien p->tolimit = MINARCS; 9590075Sobrien else if (p->tolimit > MAXARCS) 9690075Sobrien p->tolimit = MAXARCS; 9790075Sobrien p->tossize = p->tolimit * sizeof(struct tostruct); 9890075Sobrien 9990075Sobrien cp = sbrk(p->kcountsize + p->fromssize + p->tossize); 10090075Sobrien if (cp == (char *)-1) { 101132718Skan ERR("monstartup: out of memory\n"); 10290075Sobrien return; 103117395Skan } 10490075Sobrien#ifdef notdef 10590075Sobrien bzero(cp, p->kcountsize + p->fromssize + p->tossize); 106169689Skan#endif 10790075Sobrien p->tos = (struct tostruct *)cp; 10890075Sobrien cp += p->tossize; 10990075Sobrien p->kcount = (u_short *)cp; 11090075Sobrien cp += p->kcountsize; 111169689Skan p->froms = (u_short *)cp; 11290075Sobrien 113169689Skan minbrk = sbrk(0); 11490075Sobrien p->tos[0].link = 0; 11590075Sobrien 116169689Skan o = p->highpc - p->lowpc; 117169689Skan if (p->kcountsize < o) { 11890075Sobrien#ifndef hp300 11990075Sobrien s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 12090075Sobrien#else /* avoid floating point */ 12190075Sobrien int quot = o / p->kcountsize; 12290075Sobrien 12390075Sobrien if (quot >= 0x10000) 12490075Sobrien s_scale = 1; 12590075Sobrien else if (quot >= 0x100) 12690075Sobrien s_scale = 0x10000 / quot; 127169689Skan else if (o >= 0x800000) 12890075Sobrien s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); 12990075Sobrien else 13090075Sobrien s_scale = 0x1000000 / ((o << 8) / p->kcountsize); 13190075Sobrien#endif 13290075Sobrien } else 133132718Skan s_scale = SCALE_1_TO_1; 13490075Sobrien 13590075Sobrien moncontrol(1); 13690075Sobrien} 13790075Sobrien 138169689Skanvoid 13990075Sobrien_mcleanup() 14090075Sobrien{ 14190075Sobrien int fd; 14290075Sobrien int fromindex; 143169689Skan int endfrom; 14490075Sobrien u_long frompc; 14590075Sobrien int toindex; 146132718Skan struct rawarc rawarc; 14790075Sobrien struct gmonparam *p = &_gmonparam; 14890075Sobrien struct gmonhdr gmonhdr, *hdr; 14990075Sobrien struct clockinfo clockinfo; 150169689Skan char outname[128]; 15190075Sobrien int mib[2]; 15290075Sobrien size_t size; 15390075Sobrien#ifdef DEBUG 15490075Sobrien int log, len; 15590075Sobrien char buf[200]; 15690075Sobrien#endif 15790075Sobrien 15890075Sobrien if (p->state == GMON_PROF_ERROR) 159169689Skan ERR("_mcleanup: tos overflow\n"); 160169689Skan 16190075Sobrien size = sizeof(clockinfo); 162169689Skan mib[0] = CTL_KERN; 163169689Skan mib[1] = KERN_CLOCKRATE; 164169689Skan if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 165169689Skan /* 166169689Skan * Best guess 167169689Skan */ 168169689Skan clockinfo.profhz = hertz(); 169169689Skan } else if (clockinfo.profhz == 0) { 170169689Skan if (clockinfo.hz != 0) 171169689Skan clockinfo.profhz = clockinfo.hz; 172169689Skan else 173169689Skan clockinfo.profhz = hertz(); 174169689Skan } 175169689Skan 176169689Skan moncontrol(0); 177169689Skan snprintf(outname,sizeof(outname),"%s.gmon",__progname); 178169689Skan fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666); 179169689Skan if (fd < 0) { 180169689Skan warnx("_mcleanup: %s - %s",outname,strerror(errno)); 181169689Skan return; 182169689Skan } 183169689Skan#ifdef DEBUG 184169689Skan log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); 185169689Skan if (log < 0) { 186169689Skan perror("_mcleanup: gmon.log"); 187169689Skan return; 188169689Skan } 189169689Skan len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n", 190169689Skan p->kcount, p->kcountsize); 191169689Skan _write(log, buf, len); 192169689Skan#endif 193169689Skan hdr = (struct gmonhdr *)&gmonhdr; 194169689Skan hdr->lpc = p->lowpc; 195169689Skan hdr->hpc = p->highpc; 196169689Skan hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 197169689Skan hdr->version = GMONVERSION; 198169689Skan hdr->profrate = clockinfo.profhz; 199169689Skan _write(fd, (char *)hdr, sizeof *hdr); 200169689Skan _write(fd, p->kcount, p->kcountsize); 201169689Skan endfrom = p->fromssize / sizeof(*p->froms); 202169689Skan for (fromindex = 0; fromindex < endfrom; fromindex++) { 203169689Skan if (p->froms[fromindex] == 0) 204169689Skan continue; 205169689Skan 206169689Skan frompc = p->lowpc; 207169689Skan frompc += fromindex * p->hashfraction * sizeof(*p->froms); 208169689Skan for (toindex = p->froms[fromindex]; toindex != 0; 209169689Skan toindex = p->tos[toindex].link) { 210169689Skan#ifdef DEBUG 211169689Skan len = sprintf(buf, 212169689Skan "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" , 213169689Skan frompc, p->tos[toindex].selfpc, 214169689Skan p->tos[toindex].count); 215169689Skan _write(log, buf, len); 216169689Skan#endif 217169689Skan rawarc.raw_frompc = frompc; 218169689Skan rawarc.raw_selfpc = p->tos[toindex].selfpc; 219169689Skan rawarc.raw_count = p->tos[toindex].count; 220169689Skan _write(fd, &rawarc, sizeof rawarc); 221169689Skan } 222169689Skan } 223169689Skan _close(fd); 224169689Skan} 225169689Skan 226169689Skan/* 227169689Skan * Control profiling 228169689Skan * profiling is what mcount checks to see if 229169689Skan * all the data structures are ready. 230169689Skan */ 231169689Skanvoid 232169689Skanmoncontrol(mode) 233169689Skan int mode; 234169689Skan{ 235169689Skan struct gmonparam *p = &_gmonparam; 236169689Skan 237169689Skan if (mode) { 238169689Skan /* start */ 239169689Skan profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 240169689Skan p->state = GMON_PROF_ON; 241169689Skan } else { 242169689Skan /* stop */ 243169689Skan profil((char *)0, 0, 0, 0); 244169689Skan p->state = GMON_PROF_OFF; 245169689Skan } 246169689Skan} 247169689Skan 248169689Skan/* 249169689Skan * discover the tick frequency of the machine 250169689Skan * if something goes wrong, we return 0, an impossible hertz. 251169689Skan */ 252169689Skanstatic int 253169689Skanhertz() 254169689Skan{ 255169689Skan struct itimerval tim; 256169689Skan 257169689Skan tim.it_interval.tv_sec = 0; 258169689Skan tim.it_interval.tv_usec = 1; 259169689Skan tim.it_value.tv_sec = 0; 260169689Skan tim.it_value.tv_usec = 0; 261169689Skan setitimer(ITIMER_REAL, &tim, 0); 262169689Skan setitimer(ITIMER_REAL, 0, &tim); 263169689Skan if (tim.it_interval.tv_usec < 2) 264169689Skan return(0); 265169689Skan return (1000000 / tim.it_interval.tv_usec); 266169689Skan} 267169689Skan