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/sysctl.h> 38 39 #include <err.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include "un-namespace.h" 46 47 #include "libc_private.h" 48 49 #if defined(__i386__) || defined(__sparc64__) || defined(__x86_64__) || defined(__powerpc__) 50 extern char *minbrk __asm (".minbrk"); 51 #else 52 extern char *minbrk __asm ("minbrk"); 53 #endif 54 55 struct gmonparam _gmonparam = { .state = GMON_PROF_OFF }; 56 57 static int s_scale; 58 /* see profil(2) where this is describe (incorrectly) */ 59 #define SCALE_1_TO_1 0x10000L 60 61 #define ERR(s) _write(2, s, sizeof(s)) 62 63 void moncontrol(int); 64 static int hertz(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 = sbrk(p->kcountsize + p->fromssize + p->tossize); 91 if (cp == (char *)-1) { 92 ERR("monstartup: out of memory\n"); 93 return; 94 } 95 #ifdef notdef 96 bzero(cp, p->kcountsize + p->fromssize + p->tossize); 97 #endif 98 p->tos = (struct tostruct *)cp; 99 cp += p->tossize; 100 p->kcount = (u_short *)cp; 101 cp += p->kcountsize; 102 p->froms = (u_short *)cp; 103 104 minbrk = sbrk(0); 105 p->tos[0].link = 0; 106 107 o = p->highpc - p->lowpc; 108 if (p->kcountsize < o) { 109 #ifndef hp300 110 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 111 #else /* avoid floating point */ 112 int quot = o / p->kcountsize; 113 114 if (quot >= 0x10000) 115 s_scale = 1; 116 else if (quot >= 0x100) 117 s_scale = 0x10000 / quot; 118 else if (o >= 0x800000) 119 s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); 120 else 121 s_scale = 0x1000000 / ((o << 8) / p->kcountsize); 122 #endif 123 } else 124 s_scale = SCALE_1_TO_1; 125 126 moncontrol(1); 127 } 128 129 void 130 _mcleanup(void) 131 { 132 int fd; 133 int fromindex; 134 int endfrom; 135 u_long frompc; 136 int toindex; 137 struct rawarc rawarc; 138 struct gmonparam *p = &_gmonparam; 139 struct gmonhdr gmonhdr, *hdr; 140 struct clockinfo clockinfo; 141 char outname[128]; 142 int mib[2]; 143 size_t size; 144 #ifdef DEBUG 145 int log, len; 146 char buf[200]; 147 #endif 148 149 if (p->state == GMON_PROF_ERROR) 150 ERR("_mcleanup: tos overflow\n"); 151 152 size = sizeof(clockinfo); 153 mib[0] = CTL_KERN; 154 mib[1] = KERN_CLOCKRATE; 155 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 156 /* 157 * Best guess 158 */ 159 clockinfo.profhz = hertz(); 160 } else if (clockinfo.profhz == 0) { 161 if (clockinfo.hz != 0) 162 clockinfo.profhz = clockinfo.hz; 163 else 164 clockinfo.profhz = hertz(); 165 } 166 167 moncontrol(0); 168 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname()); 169 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666); 170 if (fd < 0) { 171 _warn("_mcleanup: %s", outname); 172 return; 173 } 174 #ifdef DEBUG 175 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); 176 if (log < 0) { 177 _warn("_mcleanup: gmon.log"); 178 return; 179 } 180 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n", 181 p->kcount, p->kcountsize); 182 _write(log, buf, len); 183 #endif 184 hdr = (struct gmonhdr *)&gmonhdr; 185 bzero(hdr, sizeof(*hdr)); 186 hdr->lpc = p->lowpc; 187 hdr->hpc = p->highpc; 188 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 189 hdr->version = GMONVERSION; 190 hdr->profrate = clockinfo.profhz; 191 _write(fd, (char *)hdr, sizeof *hdr); 192 _write(fd, p->kcount, p->kcountsize); 193 endfrom = p->fromssize / sizeof(*p->froms); 194 for (fromindex = 0; fromindex < endfrom; fromindex++) { 195 if (p->froms[fromindex] == 0) 196 continue; 197 198 frompc = p->lowpc; 199 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 200 for (toindex = p->froms[fromindex]; toindex != 0; 201 toindex = p->tos[toindex].link) { 202 #ifdef DEBUG 203 len = sprintf(buf, 204 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" , 205 frompc, p->tos[toindex].selfpc, 206 p->tos[toindex].count); 207 _write(log, buf, len); 208 #endif 209 rawarc.raw_frompc = frompc; 210 rawarc.raw_selfpc = p->tos[toindex].selfpc; 211 rawarc.raw_count = p->tos[toindex].count; 212 _write(fd, &rawarc, sizeof rawarc); 213 } 214 } 215 _close(fd); 216 } 217 218 /* 219 * Control profiling 220 * profiling is what mcount checks to see if 221 * all the data structures are ready. 222 */ 223 void 224 moncontrol(int mode) 225 { 226 struct gmonparam *p = &_gmonparam; 227 228 if (mode) { 229 /* start */ 230 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 231 p->state = GMON_PROF_ON; 232 } else { 233 /* stop */ 234 profil(NULL, 0, 0, 0); 235 p->state = GMON_PROF_OFF; 236 } 237 } 238 239 /* 240 * discover the tick frequency of the machine 241 * if something goes wrong, we return 0, an impossible hertz. 242 */ 243 static int 244 hertz(void) 245 { 246 struct itimerval tim; 247 248 tim.it_interval.tv_sec = 0; 249 tim.it_interval.tv_usec = 1; 250 tim.it_value.tv_sec = 0; 251 tim.it_value.tv_usec = 0; 252 setitimer(ITIMER_REAL, &tim, 0); 253 setitimer(ITIMER_REAL, 0, &tim); 254 if (tim.it_interval.tv_usec < 2) 255 return(0); 256 return (1000000 / tim.it_interval.tv_usec); 257 } 258