1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include "namespace.h" 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/gmon.h> 36 #include <sys/mman.h> 37 #include <sys/sysctl.h> 38 39 #include <err.h> 40 #include <fcntl.h> 41 #include <inttypes.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 = { GMON_PROF_OFF }; 51 52 static int s_scale; 53 /* See profil(2) where this is described (incorrectly). */ 54 #define SCALE_SHIFT 16 55 56 #define ERR(s) _write(2, s, sizeof(s)) 57 58 void moncontrol(int); 59 static int hertz(void); 60 void _mcleanup(void); 61 62 void 63 monstartup(u_long lowpc, u_long highpc) 64 { 65 int o; 66 char *cp; 67 struct gmonparam *p = &_gmonparam; 68 69 /* 70 * round lowpc and highpc to multiples of the density we're using 71 * so the rest of the scaling (here and in gprof) stays in ints. 72 */ 73 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 74 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 75 p->textsize = p->highpc - p->lowpc; 76 p->kcountsize = p->textsize / HISTFRACTION; 77 p->hashfraction = HASHFRACTION; 78 p->fromssize = p->textsize / HASHFRACTION; 79 p->tolimit = p->textsize * ARCDENSITY / 100; 80 if (p->tolimit < MINARCS) 81 p->tolimit = MINARCS; 82 else if (p->tolimit > MAXARCS) 83 p->tolimit = MAXARCS; 84 p->tossize = p->tolimit * sizeof(struct tostruct); 85 86 cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize, 87 PROT_READ | PROT_WRITE, MAP_ANON, -1, 0); 88 if (cp == MAP_FAILED) { 89 ERR("monstartup: out of memory\n"); 90 return; 91 } 92 #ifdef notdef 93 bzero(cp, p->kcountsize + p->fromssize + p->tossize); 94 #endif 95 p->tos = (struct tostruct *)cp; 96 cp += p->tossize; 97 p->kcount = (u_short *)cp; 98 cp += p->kcountsize; 99 p->froms = (u_short *)cp; 100 101 p->tos[0].link = 0; 102 103 o = p->highpc - p->lowpc; 104 s_scale = (p->kcountsize < o) ? 105 ((uintmax_t)p->kcountsize << SCALE_SHIFT) / o : (1 << SCALE_SHIFT); 106 moncontrol(1); 107 } 108 109 void 110 _mcleanup(void) 111 { 112 int fd; 113 int fromindex; 114 int endfrom; 115 u_long frompc; 116 int toindex; 117 struct rawarc rawarc; 118 struct gmonparam *p = &_gmonparam; 119 struct gmonhdr gmonhdr, *hdr; 120 struct clockinfo clockinfo; 121 char outname[128]; 122 int mib[2]; 123 size_t size; 124 #ifdef DEBUG 125 int log, len; 126 char buf[200]; 127 #endif 128 129 if (p->state == GMON_PROF_ERROR) 130 ERR("_mcleanup: tos overflow\n"); 131 132 size = sizeof(clockinfo); 133 mib[0] = CTL_KERN; 134 mib[1] = KERN_CLOCKRATE; 135 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 136 /* 137 * Best guess 138 */ 139 clockinfo.profhz = hertz(); 140 } else if (clockinfo.profhz == 0) { 141 if (clockinfo.hz != 0) 142 clockinfo.profhz = clockinfo.hz; 143 else 144 clockinfo.profhz = hertz(); 145 } 146 147 moncontrol(0); 148 if (getenv("PROFIL_USE_PID")) 149 snprintf(outname, sizeof(outname), "%s.%d.gmon", 150 _getprogname(), getpid()); 151 else 152 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname()); 153 154 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666); 155 if (fd < 0) { 156 _warn("_mcleanup: %s", outname); 157 return; 158 } 159 #ifdef DEBUG 160 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664); 161 if (log < 0) { 162 _warn("_mcleanup: gmon.log"); 163 return; 164 } 165 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n", 166 p->kcount, p->kcountsize); 167 _write(log, buf, len); 168 #endif 169 hdr = (struct gmonhdr *)&gmonhdr; 170 bzero(hdr, sizeof(*hdr)); 171 hdr->lpc = p->lowpc; 172 hdr->hpc = p->highpc; 173 hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 174 hdr->version = GMONVERSION; 175 hdr->profrate = clockinfo.profhz; 176 _write(fd, (char *)hdr, sizeof *hdr); 177 _write(fd, p->kcount, p->kcountsize); 178 endfrom = p->fromssize / sizeof(*p->froms); 179 for (fromindex = 0; fromindex < endfrom; fromindex++) { 180 if (p->froms[fromindex] == 0) 181 continue; 182 183 frompc = p->lowpc; 184 frompc += fromindex * p->hashfraction * sizeof(*p->froms); 185 for (toindex = p->froms[fromindex]; toindex != 0; 186 toindex = p->tos[toindex].link) { 187 #ifdef DEBUG 188 len = sprintf(buf, 189 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" , 190 frompc, p->tos[toindex].selfpc, 191 p->tos[toindex].count); 192 _write(log, buf, len); 193 #endif 194 rawarc.raw_frompc = frompc; 195 rawarc.raw_selfpc = p->tos[toindex].selfpc; 196 rawarc.raw_count = p->tos[toindex].count; 197 _write(fd, &rawarc, sizeof rawarc); 198 } 199 } 200 _close(fd); 201 } 202 203 /* 204 * Control profiling 205 * profiling is what mcount checks to see if 206 * all the data structures are ready. 207 */ 208 void 209 moncontrol(int mode) 210 { 211 struct gmonparam *p = &_gmonparam; 212 213 if (mode) { 214 /* start */ 215 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); 216 p->state = GMON_PROF_ON; 217 } else { 218 /* stop */ 219 profil((char *)0, 0, 0, 0); 220 p->state = GMON_PROF_OFF; 221 } 222 } 223 224 /* 225 * discover the tick frequency of the machine 226 * if something goes wrong, we return 0, an impossible hertz. 227 */ 228 static int 229 hertz(void) 230 { 231 struct itimerval tim; 232 233 tim.it_interval.tv_sec = 0; 234 tim.it_interval.tv_usec = 1; 235 tim.it_value.tv_sec = 0; 236 tim.it_value.tv_usec = 0; 237 setitimer(ITIMER_REAL, &tim, 0); 238 setitimer(ITIMER_REAL, 0, &tim); 239 if (tim.it_interval.tv_usec < 2) 240 return(0); 241 return (1000000 / tim.it_interval.tv_usec); 242 } 243