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) 31 static 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/mman.h> 41 #include <sys/sysctl.h> 42 43 #include <err.h> 44 #include <fcntl.h> 45 #include <inttypes.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include "un-namespace.h" 51 52 #include "libc_private.h" 53 54 struct gmonparam _gmonparam = { GMON_PROF_OFF }; 55 56 static int s_scale; 57 /* See profil(2) where this is described (incorrectly). */ 58 #define SCALE_SHIFT 16 59 60 #define ERR(s) _write(2, s, sizeof(s)) 61 62 void moncontrol(int); 63 static int hertz(void); 64 void _mcleanup(void); 65 66 void 67 monstartup(u_long lowpc, u_long highpc) 68 { 69 int o; 70 char *cp; 71 struct gmonparam *p = &_gmonparam; 72 73 /* 74 * round lowpc and highpc to multiples of the density we're using 75 * so the rest of the scaling (here and in gprof) stays in ints. 76 */ 77 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 78 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 79 p->textsize = p->highpc - p->lowpc; 80 p->kcountsize = p->textsize / HISTFRACTION; 81 p->hashfraction = HASHFRACTION; 82 p->fromssize = p->textsize / HASHFRACTION; 83 p->tolimit = p->textsize * ARCDENSITY / 100; 84 if (p->tolimit < MINARCS) 85 p->tolimit = MINARCS; 86 else if (p->tolimit > MAXARCS) 87 p->tolimit = MAXARCS; 88 p->tossize = p->tolimit * sizeof(struct tostruct); 89 90 cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize, 91 PROT_READ | PROT_WRITE, MAP_ANON, -1, 0); 92 if (cp == MAP_FAILED) { 93 ERR("monstartup: out of memory\n"); 94 return; 95 } 96 #ifdef notdef 97 bzero(cp, p->kcountsize + p->fromssize + p->tossize); 98 #endif 99 p->tos = (struct tostruct *)cp; 100 cp += p->tossize; 101 p->kcount = (u_short *)cp; 102 cp += p->kcountsize; 103 p->froms = (u_short *)cp; 104 105 p->tos[0].link = 0; 106 107 o = p->highpc - p->lowpc; 108 s_scale = (p->kcountsize < o) ? 109 ((uintmax_t)p->kcountsize << SCALE_SHIFT) / o : (1 << SCALE_SHIFT); 110 moncontrol(1); 111 } 112 113 void 114 _mcleanup(void) 115 { 116 int fd; 117 int fromindex; 118 int endfrom; 119 u_long frompc; 120 int toindex; 121 struct rawarc rawarc; 122 struct gmonparam *p = &_gmonparam; 123 struct gmonhdr gmonhdr, *hdr; 124 struct clockinfo clockinfo; 125 char outname[128]; 126 int mib[2]; 127 size_t size; 128 #ifdef DEBUG 129 int log, len; 130 char buf[200]; 131 #endif 132 133 if (p->state == GMON_PROF_ERROR) 134 ERR("_mcleanup: tos overflow\n"); 135 136 size = sizeof(clockinfo); 137 mib[0] = CTL_KERN; 138 mib[1] = KERN_CLOCKRATE; 139 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 140 /* 141 * Best guess 142 */ 143 clockinfo.profhz = hertz(); 144 } else if (clockinfo.profhz == 0) { 145 if (clockinfo.hz != 0) 146 clockinfo.profhz = clockinfo.hz; 147 else 148 clockinfo.profhz = hertz(); 149 } 150 151 moncontrol(0); 152 if (getenv("PROFIL_USE_PID")) 153 snprintf(outname, sizeof(outname), "%s.%d.gmon", 154 _getprogname(), getpid()); 155 else 156 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname()); 157 158 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666); 159 if (fd < 0) { 160 _warn("_mcleanup: %s", outname); 161 return; 162 } 163 #ifdef DEBUG 164 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664); 165 if (log < 0) { 166 _warn("_mcleanup: gmon.log"); 167 return; 168 } 169 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n", 170 p->kcount, p->kcountsize); 171 _write(log, buf, len); 172 #endif 173 hdr = (struct gmonhdr *)&gmonhdr; 174 bzero(hdr, sizeof(*hdr)); 175 hdr->lpc = p->lowpc; 176 hdr->hpc = p->highpc; 177 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 178 hdr->version = GMONVERSION; 179 hdr->profrate = clockinfo.profhz; 180 _write(fd, (char *)hdr, sizeof *hdr); 181 _write(fd, p->kcount, p->kcountsize); 182 endfrom = p->fromssize / sizeof(*p->froms); 183 for (fromindex = 0; fromindex < endfrom; fromindex++) { 184 if (p->froms[fromindex] == 0) 185 continue; 186 187 frompc = p->lowpc; 188 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 189 for (toindex = p->froms[fromindex]; toindex != 0; 190 toindex = p->tos[toindex].link) { 191 #ifdef DEBUG 192 len = sprintf(buf, 193 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" , 194 frompc, p->tos[toindex].selfpc, 195 p->tos[toindex].count); 196 _write(log, buf, len); 197 #endif 198 rawarc.raw_frompc = frompc; 199 rawarc.raw_selfpc = p->tos[toindex].selfpc; 200 rawarc.raw_count = p->tos[toindex].count; 201 _write(fd, &rawarc, sizeof rawarc); 202 } 203 } 204 _close(fd); 205 } 206 207 /* 208 * Control profiling 209 * profiling is what mcount checks to see if 210 * all the data structures are ready. 211 */ 212 void 213 moncontrol(int mode) 214 { 215 struct gmonparam *p = &_gmonparam; 216 217 if (mode) { 218 /* start */ 219 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 220 p->state = GMON_PROF_ON; 221 } else { 222 /* stop */ 223 profil((char *)0, 0, 0, 0); 224 p->state = GMON_PROF_OFF; 225 } 226 } 227 228 /* 229 * discover the tick frequency of the machine 230 * if something goes wrong, we return 0, an impossible hertz. 231 */ 232 static int 233 hertz(void) 234 { 235 struct itimerval tim; 236 237 tim.it_interval.tv_sec = 0; 238 tim.it_interval.tv_usec = 1; 239 tim.it_value.tv_sec = 0; 240 tim.it_value.tv_usec = 0; 241 setitimer(ITIMER_REAL, &tim, 0); 242 setitimer(ITIMER_REAL, 0, &tim); 243 if (tim.it_interval.tv_usec < 2) 244 return(0); 245 return (1000000 / tim.it_interval.tv_usec); 246 } 247