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 * @(#)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 * $DragonFly: src/lib/libc/gmon/gmon.c,v 1.8 2005/11/13 01:18:20 swildner Exp $ 32 */ 33 34 #include "namespace.h" 35 #include <sys/param.h> 36 #include <sys/time.h> 37 #include <sys/gmon.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 #if defined(__i386__) || defined(__sparc64__) || defined(__amd64__) || defined(__powerpc__) 51 extern char *minbrk __asm (".minbrk"); 52 #else 53 extern char *minbrk __asm ("minbrk"); 54 #endif 55 56 struct gmonparam _gmonparam = { GMON_PROF_OFF }; 57 58 static int s_scale; 59 /* see profil(2) where this is describe (incorrectly) */ 60 #define SCALE_1_TO_1 0x10000L 61 62 #define ERR(s) _write(2, s, sizeof(s)) 63 64 void moncontrol(int); 65 static int hertz(void); 66 67 void 68 monstartup(u_long lowpc, u_long highpc) 69 { 70 int o; 71 char *cp; 72 struct gmonparam *p = &_gmonparam; 73 74 /* 75 * round lowpc and highpc to multiples of the density we're using 76 * so the rest of the scaling (here and in gprof) stays in ints. 77 */ 78 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 79 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 80 p->textsize = p->highpc - p->lowpc; 81 p->kcountsize = p->textsize / HISTFRACTION; 82 p->hashfraction = HASHFRACTION; 83 p->fromssize = p->textsize / HASHFRACTION; 84 p->tolimit = p->textsize * ARCDENSITY / 100; 85 if (p->tolimit < MINARCS) 86 p->tolimit = MINARCS; 87 else if (p->tolimit > MAXARCS) 88 p->tolimit = MAXARCS; 89 p->tossize = p->tolimit * sizeof(struct tostruct); 90 91 cp = sbrk(p->kcountsize + p->fromssize + p->tossize); 92 if (cp == (char *)-1) { 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 minbrk = sbrk(0); 106 p->tos[0].link = 0; 107 108 o = p->highpc - p->lowpc; 109 if (p->kcountsize < o) { 110 #ifndef hp300 111 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 112 #else /* avoid floating point */ 113 int quot = o / p->kcountsize; 114 115 if (quot >= 0x10000) 116 s_scale = 1; 117 else if (quot >= 0x100) 118 s_scale = 0x10000 / quot; 119 else if (o >= 0x800000) 120 s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); 121 else 122 s_scale = 0x1000000 / ((o << 8) / p->kcountsize); 123 #endif 124 } else 125 s_scale = SCALE_1_TO_1; 126 127 moncontrol(1); 128 } 129 130 void 131 _mcleanup(void) 132 { 133 int fd; 134 int fromindex; 135 int endfrom; 136 u_long frompc; 137 int toindex; 138 struct rawarc rawarc; 139 struct gmonparam *p = &_gmonparam; 140 struct gmonhdr gmonhdr, *hdr; 141 struct clockinfo clockinfo; 142 char outname[128]; 143 int mib[2]; 144 size_t size; 145 #ifdef DEBUG 146 int log, len; 147 char buf[200]; 148 #endif 149 150 if (p->state == GMON_PROF_ERROR) 151 ERR("_mcleanup: tos overflow\n"); 152 153 size = sizeof(clockinfo); 154 mib[0] = CTL_KERN; 155 mib[1] = KERN_CLOCKRATE; 156 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 157 /* 158 * Best guess 159 */ 160 clockinfo.profhz = hertz(); 161 } else if (clockinfo.profhz == 0) { 162 if (clockinfo.hz != 0) 163 clockinfo.profhz = clockinfo.hz; 164 else 165 clockinfo.profhz = hertz(); 166 } 167 168 moncontrol(0); 169 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname()); 170 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666); 171 if (fd < 0) { 172 _warn("_mcleanup: %s", outname); 173 return; 174 } 175 #ifdef DEBUG 176 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); 177 if (log < 0) { 178 _warn("_mcleanup: gmon.log"); 179 return; 180 } 181 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n", 182 p->kcount, p->kcountsize); 183 _write(log, buf, len); 184 #endif 185 hdr = (struct gmonhdr *)&gmonhdr; 186 bzero(hdr, sizeof(*hdr)); 187 hdr->lpc = p->lowpc; 188 hdr->hpc = p->highpc; 189 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 190 hdr->version = GMONVERSION; 191 hdr->profrate = clockinfo.profhz; 192 _write(fd, (char *)hdr, sizeof *hdr); 193 _write(fd, p->kcount, p->kcountsize); 194 endfrom = p->fromssize / sizeof(*p->froms); 195 for (fromindex = 0; fromindex < endfrom; fromindex++) { 196 if (p->froms[fromindex] == 0) 197 continue; 198 199 frompc = p->lowpc; 200 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 201 for (toindex = p->froms[fromindex]; toindex != 0; 202 toindex = p->tos[toindex].link) { 203 #ifdef DEBUG 204 len = sprintf(buf, 205 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" , 206 frompc, p->tos[toindex].selfpc, 207 p->tos[toindex].count); 208 _write(log, buf, len); 209 #endif 210 rawarc.raw_frompc = frompc; 211 rawarc.raw_selfpc = p->tos[toindex].selfpc; 212 rawarc.raw_count = p->tos[toindex].count; 213 _write(fd, &rawarc, sizeof rawarc); 214 } 215 } 216 _close(fd); 217 } 218 219 /* 220 * Control profiling 221 * profiling is what mcount checks to see if 222 * all the data structures are ready. 223 */ 224 void 225 moncontrol(int mode) 226 { 227 struct gmonparam *p = &_gmonparam; 228 229 if (mode) { 230 /* start */ 231 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 232 p->state = GMON_PROF_ON; 233 } else { 234 /* stop */ 235 profil(NULL, 0, 0, 0); 236 p->state = GMON_PROF_OFF; 237 } 238 } 239 240 /* 241 * discover the tick frequency of the machine 242 * if something goes wrong, we return 0, an impossible hertz. 243 */ 244 static int 245 hertz(void) 246 { 247 struct itimerval tim; 248 249 tim.it_interval.tv_sec = 0; 250 tim.it_interval.tv_usec = 1; 251 tim.it_value.tv_sec = 0; 252 tim.it_value.tv_usec = 0; 253 setitimer(ITIMER_REAL, &tim, 0); 254 setitimer(ITIMER_REAL, 0, &tim); 255 if (tim.it_interval.tv_usec < 2) 256 return(0); 257 return (1000000 / tim.it_interval.tv_usec); 258 } 259