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. 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 * @(#)gmon.c 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: src/lib/libc/gmon/gmon.c,v 1.22 2007/01/09 00:27:58 imp Exp $ 31 */ 32 33 #include "namespace.h" 34 #include <sys/param.h> 35 #include <sys/time.h> 36 #include <sys/gmon.h> 37 #include <sys/mman.h> 38 #include <sys/sysctl.h> 39 40 #include <err.h> 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include "un-namespace.h" 47 48 #include "libc_private.h" 49 50 struct gmonparam _gmonparam = { .state = GMON_PROF_OFF }; 51 52 static int s_scale; 53 /* see profil(2) where this is describe (incorrectly) */ 54 #define SCALE_1_TO_1 0x10000L 55 56 #define ERR(s) _write(2, s, sizeof(s)) 57 58 void moncontrol(int); 59 static int hertz(void); 60 61 void 62 monstartup(u_long lowpc, u_long highpc) 63 { 64 int o; 65 char *cp; 66 struct gmonparam *p = &_gmonparam; 67 68 /* 69 * round lowpc and highpc to multiples of the density we're using 70 * so the rest of the scaling (here and in gprof) stays in ints. 71 */ 72 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 73 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 74 p->textsize = p->highpc - p->lowpc; 75 p->kcountsize = p->textsize / HISTFRACTION; 76 p->hashfraction = HASHFRACTION; 77 p->fromssize = p->textsize / HASHFRACTION; 78 p->tolimit = p->textsize * ARCDENSITY / 100; 79 if (p->tolimit < MINARCS) 80 p->tolimit = MINARCS; 81 else if (p->tolimit > MAXARCS) 82 p->tolimit = MAXARCS; 83 p->tossize = p->tolimit * sizeof(struct tostruct); 84 85 cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize, 86 PROT_READ | PROT_WRITE, MAP_ANON, -1, 0); 87 if (cp == MAP_FAILED) { 88 ERR("monstartup: out of memory\n"); 89 return; 90 } 91 #ifdef notdef 92 bzero(cp, p->kcountsize + p->fromssize + p->tossize); 93 #endif 94 p->tos = (struct tostruct *)cp; 95 cp += p->tossize; 96 p->kcount = (u_short *)cp; 97 cp += p->kcountsize; 98 p->froms = (u_short *)cp; 99 100 p->tos[0].link = 0; 101 102 o = p->highpc - p->lowpc; 103 if (p->kcountsize < o) 104 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 105 else 106 s_scale = SCALE_1_TO_1; 107 108 moncontrol(1); 109 } 110 111 void 112 _mcleanup(void) 113 { 114 int fd; 115 int fromindex; 116 int endfrom; 117 u_long frompc; 118 int toindex; 119 struct rawarc rawarc; 120 struct gmonparam *p = &_gmonparam; 121 struct gmonhdr gmonhdr, *hdr; 122 struct clockinfo clockinfo; 123 char outname[128]; 124 int mib[2]; 125 size_t size; 126 #ifdef DEBUG 127 int log, len; 128 char buf[200]; 129 #endif 130 131 if (p->state == GMON_PROF_ERROR) 132 ERR("_mcleanup: tos overflow\n"); 133 134 size = sizeof(clockinfo); 135 mib[0] = CTL_KERN; 136 mib[1] = KERN_CLOCKRATE; 137 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 138 /* 139 * Best guess 140 */ 141 clockinfo.profhz = hertz(); 142 } else if (clockinfo.profhz == 0) { 143 if (clockinfo.hz != 0) 144 clockinfo.profhz = clockinfo.hz; 145 else 146 clockinfo.profhz = hertz(); 147 } 148 149 moncontrol(0); 150 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname()); 151 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666); 152 if (fd < 0) { 153 _warn("_mcleanup: %s", outname); 154 return; 155 } 156 #ifdef DEBUG 157 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664); 158 if (log < 0) { 159 _warn("_mcleanup: gmon.log"); 160 return; 161 } 162 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n", 163 p->kcount, p->kcountsize); 164 _write(log, buf, len); 165 #endif 166 hdr = (struct gmonhdr *)&gmonhdr; 167 bzero(hdr, sizeof(*hdr)); 168 hdr->lpc = p->lowpc; 169 hdr->hpc = p->highpc; 170 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 171 hdr->version = GMONVERSION; 172 hdr->profrate = clockinfo.profhz; 173 _write(fd, (char *)hdr, sizeof *hdr); 174 _write(fd, p->kcount, p->kcountsize); 175 endfrom = p->fromssize / sizeof(*p->froms); 176 for (fromindex = 0; fromindex < endfrom; fromindex++) { 177 if (p->froms[fromindex] == 0) 178 continue; 179 180 frompc = p->lowpc; 181 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 182 for (toindex = p->froms[fromindex]; toindex != 0; 183 toindex = p->tos[toindex].link) { 184 #ifdef DEBUG 185 len = sprintf(buf, 186 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" , 187 frompc, p->tos[toindex].selfpc, 188 p->tos[toindex].count); 189 _write(log, buf, len); 190 #endif 191 rawarc.raw_frompc = frompc; 192 rawarc.raw_selfpc = p->tos[toindex].selfpc; 193 rawarc.raw_count = p->tos[toindex].count; 194 _write(fd, &rawarc, sizeof rawarc); 195 } 196 } 197 _close(fd); 198 } 199 200 /* 201 * Control profiling 202 * profiling is what mcount checks to see if 203 * all the data structures are ready. 204 */ 205 void 206 moncontrol(int mode) 207 { 208 struct gmonparam *p = &_gmonparam; 209 210 if (mode) { 211 /* start */ 212 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 213 p->state = GMON_PROF_ON; 214 } else { 215 /* stop */ 216 profil(NULL, 0, 0, 0); 217 p->state = GMON_PROF_OFF; 218 } 219 } 220 221 /* 222 * discover the tick frequency of the machine 223 * if something goes wrong, we return 0, an impossible hertz. 224 */ 225 static int 226 hertz(void) 227 { 228 struct itimerval tim; 229 230 tim.it_interval.tv_sec = 0; 231 tim.it_interval.tv_usec = 1; 232 tim.it_value.tv_sec = 0; 233 tim.it_value.tv_usec = 0; 234 setitimer(ITIMER_REAL, &tim, 0); 235 setitimer(ITIMER_REAL, 0, &tim); 236 if (tim.it_interval.tv_usec < 2) 237 return(0); 238 return (1000000 / tim.it_interval.tv_usec); 239 } 240