gmon.c revision 287793
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: head/lib/libc/gmon/gmon.c 287793 2015-09-14 18:44:13Z rodrigc $"); 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(u_long lowpc, u_long highpc) 74{ 75 int o; 76 char *cp; 77 struct gmonparam *p = &_gmonparam; 78 79 /* 80 * round lowpc and highpc to multiples of the density we're using 81 * so the rest of the scaling (here and in gprof) stays in ints. 82 */ 83 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 84 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 85 p->textsize = p->highpc - p->lowpc; 86 p->kcountsize = p->textsize / HISTFRACTION; 87 p->hashfraction = HASHFRACTION; 88 p->fromssize = p->textsize / HASHFRACTION; 89 p->tolimit = p->textsize * ARCDENSITY / 100; 90 if (p->tolimit < MINARCS) 91 p->tolimit = MINARCS; 92 else if (p->tolimit > MAXARCS) 93 p->tolimit = MAXARCS; 94 p->tossize = p->tolimit * sizeof(struct tostruct); 95 96 cp = sbrk(p->kcountsize + p->fromssize + p->tossize); 97 if (cp == (char *)-1) { 98 ERR("monstartup: out of memory\n"); 99 return; 100 } 101#ifdef notdef 102 bzero(cp, p->kcountsize + p->fromssize + p->tossize); 103#endif 104 p->tos = (struct tostruct *)cp; 105 cp += p->tossize; 106 p->kcount = (u_short *)cp; 107 cp += p->kcountsize; 108 p->froms = (u_short *)cp; 109 110 minbrk = sbrk(0); 111 p->tos[0].link = 0; 112 113 o = p->highpc - p->lowpc; 114 s_scale = (p->kcountsize < o) ? 115 ((uintmax_t)p->kcountsize << SCALE_SHIFT) / o : (1 << SCALE_SHIFT); 116 moncontrol(1); 117} 118 119void 120_mcleanup(void) 121{ 122 int fd; 123 int fromindex; 124 int endfrom; 125 u_long frompc; 126 int toindex; 127 struct rawarc rawarc; 128 struct gmonparam *p = &_gmonparam; 129 struct gmonhdr gmonhdr, *hdr; 130 struct clockinfo clockinfo; 131 char outname[128]; 132 int mib[2]; 133 size_t size; 134#ifdef DEBUG 135 int log, len; 136 char buf[200]; 137#endif 138 139 if (p->state == GMON_PROF_ERROR) 140 ERR("_mcleanup: tos overflow\n"); 141 142 size = sizeof(clockinfo); 143 mib[0] = CTL_KERN; 144 mib[1] = KERN_CLOCKRATE; 145 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 146 /* 147 * Best guess 148 */ 149 clockinfo.profhz = hertz(); 150 } else if (clockinfo.profhz == 0) { 151 if (clockinfo.hz != 0) 152 clockinfo.profhz = clockinfo.hz; 153 else 154 clockinfo.profhz = hertz(); 155 } 156 157 moncontrol(0); 158 if (getenv("PROFIL_USE_PID")) 159 snprintf(outname, sizeof(outname), "%s.%d.gmon", 160 _getprogname(), getpid()); 161 else 162 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname()); 163 164 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666); 165 if (fd < 0) { 166 _warn("_mcleanup: %s", outname); 167 return; 168 } 169#ifdef DEBUG 170 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664); 171 if (log < 0) { 172 _warn("_mcleanup: gmon.log"); 173 return; 174 } 175 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n", 176 p->kcount, p->kcountsize); 177 _write(log, buf, len); 178#endif 179 hdr = (struct gmonhdr *)&gmonhdr; 180 bzero(hdr, sizeof(*hdr)); 181 hdr->lpc = p->lowpc; 182 hdr->hpc = p->highpc; 183 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 184 hdr->version = GMONVERSION; 185 hdr->profrate = clockinfo.profhz; 186 _write(fd, (char *)hdr, sizeof *hdr); 187 _write(fd, p->kcount, p->kcountsize); 188 endfrom = p->fromssize / sizeof(*p->froms); 189 for (fromindex = 0; fromindex < endfrom; fromindex++) { 190 if (p->froms[fromindex] == 0) 191 continue; 192 193 frompc = p->lowpc; 194 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 195 for (toindex = p->froms[fromindex]; toindex != 0; 196 toindex = p->tos[toindex].link) { 197#ifdef DEBUG 198 len = sprintf(buf, 199 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" , 200 frompc, p->tos[toindex].selfpc, 201 p->tos[toindex].count); 202 _write(log, buf, len); 203#endif 204 rawarc.raw_frompc = frompc; 205 rawarc.raw_selfpc = p->tos[toindex].selfpc; 206 rawarc.raw_count = p->tos[toindex].count; 207 _write(fd, &rawarc, sizeof rawarc); 208 } 209 } 210 _close(fd); 211} 212 213/* 214 * Control profiling 215 * profiling is what mcount checks to see if 216 * all the data structures are ready. 217 */ 218void 219moncontrol(int mode) 220{ 221 struct gmonparam *p = &_gmonparam; 222 223 if (mode) { 224 /* start */ 225 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 226 p->state = GMON_PROF_ON; 227 } else { 228 /* stop */ 229 profil((char *)0, 0, 0, 0); 230 p->state = GMON_PROF_OFF; 231 } 232} 233 234/* 235 * discover the tick frequency of the machine 236 * if something goes wrong, we return 0, an impossible hertz. 237 */ 238static int 239hertz(void) 240{ 241 struct itimerval tim; 242 243 tim.it_interval.tv_sec = 0; 244 tim.it_interval.tv_usec = 1; 245 tim.it_value.tv_sec = 0; 246 tim.it_value.tv_usec = 0; 247 setitimer(ITIMER_REAL, &tim, 0); 248 setitimer(ITIMER_REAL, 0, &tim); 249 if (tim.it_interval.tv_usec < 2) 250 return(0); 251 return (1000000 / tim.it_interval.tv_usec); 252} 253