1/* $OpenBSD: gmon.c,v 1.33 2022/07/26 04:07:13 cheloha Exp $ */ 2/*- 3 * Copyright (c) 1983, 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <sys/time.h> 32#include <sys/gmon.h> 33#include <sys/mman.h> 34#include <sys/sysctl.h> 35 36#include <stdio.h> 37#include <stdlib.h> 38#include <string.h> 39#include <fcntl.h> 40#include <limits.h> 41#include <unistd.h> 42 43struct gmonparam _gmonparam = { GMON_PROF_OFF }; 44 45static int s_scale; 46/* see profil(2) where this is describe (incorrectly) */ 47#define SCALE_1_TO_1 0x10000L 48 49#define ERR(s) write(STDERR_FILENO, s, sizeof(s)) 50 51PROTO_NORMAL(moncontrol); 52PROTO_DEPRECATED(monstartup); 53 54void 55monstartup(u_long lowpc, u_long highpc) 56{ 57 int o; 58 void *addr; 59 struct gmonparam *p = &_gmonparam; 60 61 /* 62 * round lowpc and highpc to multiples of the density we're using 63 * so the rest of the scaling (here and in gprof) stays in ints. 64 */ 65 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 66 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 67 p->textsize = p->highpc - p->lowpc; 68 p->kcountsize = p->textsize / HISTFRACTION; 69 p->hashfraction = HASHFRACTION; 70 p->fromssize = p->textsize / p->hashfraction; 71 p->tolimit = p->textsize * ARCDENSITY / 100; 72 if (p->tolimit < MINARCS) 73 p->tolimit = MINARCS; 74 else if (p->tolimit > MAXARCS) 75 p->tolimit = MAXARCS; 76 p->tossize = p->tolimit * sizeof(struct tostruct); 77 78 addr = mmap(NULL, p->kcountsize, PROT_READ|PROT_WRITE, 79 MAP_ANON|MAP_PRIVATE, -1, 0); 80 if (addr == MAP_FAILED) 81 goto mapfailed; 82 p->kcount = addr; 83 84 addr = mmap(NULL, p->fromssize, PROT_READ|PROT_WRITE, 85 MAP_ANON|MAP_PRIVATE, -1, 0); 86 if (addr == MAP_FAILED) 87 goto mapfailed; 88 p->froms = addr; 89 90 addr = mmap(NULL, p->tossize, PROT_READ|PROT_WRITE, 91 MAP_ANON|MAP_PRIVATE, -1, 0); 92 if (addr == MAP_FAILED) 93 goto mapfailed; 94 p->tos = addr; 95 p->tos[0].link = 0; 96 97 o = p->highpc - p->lowpc; 98 if (p->kcountsize < o) { 99#ifndef notdef 100 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 101#else /* avoid floating point */ 102 int quot = o / p->kcountsize; 103 104 if (quot >= 0x10000) 105 s_scale = 1; 106 else if (quot >= 0x100) 107 s_scale = 0x10000 / quot; 108 else if (o >= 0x800000) 109 s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); 110 else 111 s_scale = 0x1000000 / ((o << 8) / p->kcountsize); 112#endif 113 } else 114 s_scale = SCALE_1_TO_1; 115 116 moncontrol(1); 117 return; 118 119mapfailed: 120 if (p->kcount != NULL) { 121 munmap(p->kcount, p->kcountsize); 122 p->kcount = NULL; 123 } 124 if (p->froms != NULL) { 125 munmap(p->froms, p->fromssize); 126 p->froms = NULL; 127 } 128 if (p->tos != NULL) { 129 munmap(p->tos, p->tossize); 130 p->tos = NULL; 131 } 132 ERR("monstartup: out of memory\n"); 133} 134__strong_alias(_monstartup,monstartup); 135 136void 137_mcleanup(void) 138{ 139 int fd; 140 int fromindex; 141 int endfrom; 142 u_long frompc; 143 int toindex; 144 struct rawarc rawarc; 145 struct gmonparam *p = &_gmonparam; 146 struct gmonhdr gmonhdr, *hdr; 147 struct clockinfo clockinfo; 148 const int mib[2] = { CTL_KERN, KERN_CLOCKRATE }; 149 size_t size; 150 char *profdir; 151 char *proffile; 152 char buf[PATH_MAX]; 153#ifdef DEBUG 154 int log, len; 155 char dbuf[200]; 156#endif 157 158 if (p->state == GMON_PROF_ERROR) 159 ERR("_mcleanup: tos overflow\n"); 160 161 /* 162 * There is nothing we can do if sysctl(2) fails or if 163 * clockinfo.hz is unset. 164 */ 165 size = sizeof(clockinfo); 166 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) == -1) { 167 clockinfo.profhz = 0; 168 } else if (clockinfo.profhz == 0) { 169 clockinfo.profhz = clockinfo.hz; /* best guess */ 170 } 171 172 moncontrol(0); 173 174 if (issetugid() == 0 && (profdir = getenv("PROFDIR")) != NULL) { 175 char *s, *t, *limit; 176 pid_t pid; 177 long divisor; 178 179 /* If PROFDIR contains a null value, no profiling 180 output is produced */ 181 if (*profdir == '\0') { 182 return; 183 } 184 185 limit = buf + sizeof buf - 1 - 10 - 1 - 186 strlen(__progname) - 1; 187 t = buf; 188 s = profdir; 189 while((*t = *s) != '\0' && t < limit) { 190 t++; 191 s++; 192 } 193 *t++ = '/'; 194 195 /* 196 * Copy and convert pid from a pid_t to a string. For 197 * best performance, divisor should be initialized to 198 * the largest power of 10 less than PID_MAX. 199 */ 200 pid = getpid(); 201 divisor=10000; 202 while (divisor > pid) divisor /= 10; /* skip leading zeros */ 203 do { 204 *t++ = (pid/divisor) + '0'; 205 pid %= divisor; 206 } while (divisor /= 10); 207 *t++ = '.'; 208 209 s = __progname; 210 while ((*t++ = *s++) != '\0') 211 ; 212 213 proffile = buf; 214 } else { 215 proffile = "gmon.out"; 216 } 217 218 fd = open(proffile , O_CREAT|O_TRUNC|O_WRONLY, 0664); 219 if (fd == -1) { 220 perror( proffile ); 221 return; 222 } 223#ifdef DEBUG 224 log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); 225 if (log == -1) { 226 perror("mcount: gmon.log"); 227 close(fd); 228 return; 229 } 230 snprintf(dbuf, sizeof dbuf, "[mcleanup1] kcount 0x%x ssiz %d\n", 231 p->kcount, p->kcountsize); 232 write(log, dbuf, strlen(dbuf)); 233#endif 234 hdr = (struct gmonhdr *)&gmonhdr; 235 bzero(hdr, sizeof(*hdr)); 236 hdr->lpc = p->lowpc; 237 hdr->hpc = p->highpc; 238 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 239 hdr->version = GMONVERSION; 240 hdr->profrate = clockinfo.profhz; 241 write(fd, (char *)hdr, sizeof *hdr); 242 write(fd, p->kcount, p->kcountsize); 243 endfrom = p->fromssize / sizeof(*p->froms); 244 for (fromindex = 0; fromindex < endfrom; fromindex++) { 245 if (p->froms[fromindex] == 0) 246 continue; 247 248 frompc = p->lowpc; 249 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 250 for (toindex = p->froms[fromindex]; toindex != 0; 251 toindex = p->tos[toindex].link) { 252#ifdef DEBUG 253 (void) snprintf(dbuf, sizeof dbuf, 254 "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" , 255 frompc, p->tos[toindex].selfpc, 256 p->tos[toindex].count); 257 write(log, dbuf, strlen(dbuf)); 258#endif 259 rawarc.raw_frompc = frompc; 260 rawarc.raw_selfpc = p->tos[toindex].selfpc; 261 rawarc.raw_count = p->tos[toindex].count; 262 write(fd, &rawarc, sizeof rawarc); 263 } 264 } 265 close(fd); 266#ifdef notyet 267 if (p->kcount != NULL) { 268 munmap(p->kcount, p->kcountsize); 269 p->kcount = NULL; 270 } 271 if (p->froms != NULL) { 272 munmap(p->froms, p->fromssize); 273 p->froms = NULL; 274 } 275 if (p->tos != NULL) { 276 munmap(p->tos, p->tossize); 277 p->tos = NULL; 278 } 279#endif 280} 281 282/* 283 * Control profiling 284 * profiling is what mcount checks to see if 285 * all the data structures are ready. 286 */ 287void 288moncontrol(int mode) 289{ 290 struct gmonparam *p = &_gmonparam; 291 292 if (mode) { 293 /* start */ 294 profil((char *)p->kcount, p->kcountsize, p->lowpc, 295 s_scale); 296 p->state = GMON_PROF_ON; 297 } else { 298 /* stop */ 299 profil(NULL, 0, 0, 0); 300 p->state = GMON_PROF_OFF; 301 } 302} 303DEF_WEAK(moncontrol); 304