254 lines
6.8 KiB
C
254 lines
6.8 KiB
C
/*-
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* Copyright (c) 1983, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/gmon.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#if defined(__i386__) || defined(__sparc64__) || defined(__amd64__) || (defined(__powerpc__) && !defined(__powerpc64__))
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extern char *minbrk __asm (".minbrk");
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#elif defined(__powerpc64__)
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extern char *minbrk __asm ("_minbrk");
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#else
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extern char *minbrk __asm ("minbrk");
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#endif
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struct gmonparam _gmonparam = { GMON_PROF_OFF };
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static int s_scale;
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/* See profil(2) where this is described (incorrectly). */
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#define SCALE_SHIFT 16
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#define ERR(s) _write(2, s, sizeof(s))
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void moncontrol(int);
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static int hertz(void);
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void _mcleanup(void);
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void
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monstartup(u_long lowpc, u_long highpc)
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{
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int o;
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char *cp;
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struct gmonparam *p = &_gmonparam;
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/*
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* round lowpc and highpc to multiples of the density we're using
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* so the rest of the scaling (here and in gprof) stays in ints.
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*/
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p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->textsize = p->highpc - p->lowpc;
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p->kcountsize = p->textsize / HISTFRACTION;
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p->hashfraction = HASHFRACTION;
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p->fromssize = p->textsize / HASHFRACTION;
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p->tolimit = p->textsize * ARCDENSITY / 100;
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if (p->tolimit < MINARCS)
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p->tolimit = MINARCS;
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else if (p->tolimit > MAXARCS)
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p->tolimit = MAXARCS;
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p->tossize = p->tolimit * sizeof(struct tostruct);
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cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
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if (cp == (char *)-1) {
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ERR("monstartup: out of memory\n");
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return;
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}
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#ifdef notdef
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bzero(cp, p->kcountsize + p->fromssize + p->tossize);
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#endif
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p->tos = (struct tostruct *)cp;
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cp += p->tossize;
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p->kcount = (u_short *)cp;
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cp += p->kcountsize;
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p->froms = (u_short *)cp;
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minbrk = sbrk(0);
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p->tos[0].link = 0;
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o = p->highpc - p->lowpc;
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s_scale = (p->kcountsize < o) ?
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((uintmax_t)p->kcountsize << SCALE_SHIFT) / o : (1 << SCALE_SHIFT);
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moncontrol(1);
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}
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void
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_mcleanup(void)
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{
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int fd;
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int fromindex;
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int endfrom;
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u_long frompc;
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int toindex;
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struct rawarc rawarc;
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struct gmonparam *p = &_gmonparam;
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struct gmonhdr gmonhdr, *hdr;
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struct clockinfo clockinfo;
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char outname[128];
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int mib[2];
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size_t size;
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#ifdef DEBUG
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int log, len;
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char buf[200];
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#endif
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if (p->state == GMON_PROF_ERROR)
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ERR("_mcleanup: tos overflow\n");
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size = sizeof(clockinfo);
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mib[0] = CTL_KERN;
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mib[1] = KERN_CLOCKRATE;
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if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
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/*
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* Best guess
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*/
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clockinfo.profhz = hertz();
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} else if (clockinfo.profhz == 0) {
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if (clockinfo.hz != 0)
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clockinfo.profhz = clockinfo.hz;
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else
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clockinfo.profhz = hertz();
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}
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moncontrol(0);
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if (getenv("PROFIL_USE_PID"))
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snprintf(outname, sizeof(outname), "%s.%d.gmon",
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_getprogname(), getpid());
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else
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snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
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fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666);
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if (fd < 0) {
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_warn("_mcleanup: %s", outname);
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return;
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}
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#ifdef DEBUG
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log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664);
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if (log < 0) {
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_warn("_mcleanup: gmon.log");
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return;
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}
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len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
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p->kcount, p->kcountsize);
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_write(log, buf, len);
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#endif
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hdr = (struct gmonhdr *)&gmonhdr;
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bzero(hdr, sizeof(*hdr));
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hdr->lpc = p->lowpc;
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hdr->hpc = p->highpc;
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hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
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hdr->version = GMONVERSION;
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hdr->profrate = clockinfo.profhz;
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_write(fd, (char *)hdr, sizeof *hdr);
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_write(fd, p->kcount, p->kcountsize);
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endfrom = p->fromssize / sizeof(*p->froms);
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for (fromindex = 0; fromindex < endfrom; fromindex++) {
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if (p->froms[fromindex] == 0)
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continue;
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frompc = p->lowpc;
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frompc += fromindex * p->hashfraction * sizeof(*p->froms);
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for (toindex = p->froms[fromindex]; toindex != 0;
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toindex = p->tos[toindex].link) {
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#ifdef DEBUG
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len = sprintf(buf,
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"[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
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frompc, p->tos[toindex].selfpc,
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p->tos[toindex].count);
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_write(log, buf, len);
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#endif
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rawarc.raw_frompc = frompc;
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rawarc.raw_selfpc = p->tos[toindex].selfpc;
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rawarc.raw_count = p->tos[toindex].count;
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_write(fd, &rawarc, sizeof rawarc);
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}
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}
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_close(fd);
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}
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/*
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* Control profiling
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* profiling is what mcount checks to see if
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* all the data structures are ready.
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*/
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void
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moncontrol(int mode)
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{
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struct gmonparam *p = &_gmonparam;
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if (mode) {
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/* start */
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profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
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p->state = GMON_PROF_ON;
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} else {
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/* stop */
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profil((char *)0, 0, 0, 0);
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p->state = GMON_PROF_OFF;
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}
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}
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/*
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* discover the tick frequency of the machine
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* if something goes wrong, we return 0, an impossible hertz.
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*/
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static int
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hertz(void)
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{
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struct itimerval tim;
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tim.it_interval.tv_sec = 0;
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tim.it_interval.tv_usec = 1;
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tim.it_value.tv_sec = 0;
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tim.it_value.tv_usec = 0;
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setitimer(ITIMER_REAL, &tim, 0);
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setitimer(ITIMER_REAL, 0, &tim);
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if (tim.it_interval.tv_usec < 2)
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return(0);
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return (1000000 / tim.it_interval.tv_usec);
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}
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