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) 31static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93"; 32#endif 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD$"); 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__)) 54extern char *minbrk __asm (".minbrk"); 55#elif defined(__powerpc64__) 56extern char *minbrk __asm ("_minbrk"); 57#else 58extern char *minbrk __asm ("minbrk"); 59#endif 60 61struct gmonparam _gmonparam = { GMON_PROF_OFF }; 62 63static 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 69void moncontrol(int); 70static int hertz(void); 71 72void 73monstartup(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 121void 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 */ 220void 221moncontrol(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 */ 241static int 242hertz() 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