494 lines
13 KiB
C
494 lines
13 KiB
C
/* $NetBSD: kgmon.c,v 1.25 2010/10/17 16:13:56 uebayasi Exp $ */
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/*
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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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* 3. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1992, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "from: @(#)kgmon.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: kgmon.c,v 1.25 2010/10/17 16:13:56 uebayasi Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/sysctl.h>
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#include <sys/gmon.h>
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#include <ctype.h>
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#include <errno.h>
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#include <kvm.h>
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#include <err.h>
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#include <limits.h>
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#include <nlist.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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static struct nlist nl[] = {
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#define N_GMONPARAM 0
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{ "__gmonparam", 0, 0, 0, 0 },
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#define N_PROFHZ 1
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{ "_profhz", 0, 0, 0, 0 },
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{ 0, 0, 0, 0, 0 }
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};
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struct kvmvars {
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kvm_t *kd;
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struct gmonparam gpm;
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};
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static int bflag, hflag, kflag, rflag, pflag;
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static int debug = 0;
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static void setprof(struct kvmvars *kvp, int state);
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static void dumpstate(struct kvmvars *kvp);
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static void reset(struct kvmvars *kvp);
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static int openfiles(char *, char *, struct kvmvars *);
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static int getprof(struct kvmvars *);
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static void kern_readonly(int);
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static int getprofhz(struct kvmvars *);
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int
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main(int argc, char **argv)
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{
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int ch, mode, disp, accessmode;
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struct kvmvars kvmvars;
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char *sys, *kmemf;
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setprogname(argv[0]);
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(void)seteuid(getuid());
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kmemf = NULL;
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sys = NULL;
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while ((ch = getopt(argc, argv, "M:N:bdhpr")) != -1) {
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switch((char)ch) {
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case 'M':
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kmemf = optarg;
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kflag = 1;
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break;
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case 'N':
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sys = optarg;
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break;
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case 'b':
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bflag = 1;
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break;
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case 'h':
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hflag = 1;
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break;
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case 'p':
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pflag = 1;
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break;
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case 'r':
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rflag = 1;
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break;
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case 'd':
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debug = 1;
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break;
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default:
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(void)fprintf(stderr,
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"usage: %s [-bdhrp] [-M core] [-N system]\n",
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getprogname());
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exit(1);
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}
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}
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argc -= optind;
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argv += optind;
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#define BACKWARD_COMPATIBILITY
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#ifdef BACKWARD_COMPATIBILITY
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if (*argv) {
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sys = *argv;
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if (*++argv) {
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kmemf = *argv;
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++kflag;
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}
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}
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#endif
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accessmode = openfiles(sys, kmemf, &kvmvars);
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mode = getprof(&kvmvars);
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if (hflag)
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disp = GMON_PROF_OFF;
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else if (bflag)
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disp = GMON_PROF_ON;
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else
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disp = mode;
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if (pflag)
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dumpstate(&kvmvars);
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if (rflag)
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reset(&kvmvars);
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if (accessmode == O_RDWR)
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setprof(&kvmvars, disp);
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(void)fprintf(stdout, "%s: kernel profiling is %s.\n",
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getprogname(), disp == GMON_PROF_OFF ? "off" : "running");
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return (0);
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}
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/*
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* Check that profiling is enabled and open any ncessary files.
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*/
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static int
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openfiles(char *sys, char *kmemf, struct kvmvars *kvp)
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{
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int mib[3], state, openmode;
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size_t size;
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char errbuf[_POSIX2_LINE_MAX];
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if (!kflag) {
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROF;
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mib[2] = GPROF_STATE;
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size = sizeof state;
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if (sysctl(mib, 3, &state, &size, NULL, 0) < 0)
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err(EXIT_FAILURE, "profiling not defined in kernel");
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if (!(bflag || hflag || rflag ||
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(pflag && state == GMON_PROF_ON)))
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return (O_RDONLY);
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(void)seteuid(0);
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if (sysctl(mib, 3, NULL, NULL, &state, size) >= 0)
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return (O_RDWR);
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(void)seteuid(getuid());
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kern_readonly(state);
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return (O_RDONLY);
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}
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openmode = (bflag || hflag || pflag || rflag) ? O_RDWR : O_RDONLY;
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kvp->kd = kvm_openfiles(sys, kmemf, NULL, openmode, errbuf);
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if (kvp->kd == NULL) {
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if (openmode == O_RDWR) {
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openmode = O_RDONLY;
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kvp->kd = kvm_openfiles(sys, kmemf, NULL, O_RDONLY,
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errbuf);
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}
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if (kvp->kd == NULL)
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errx(EXIT_FAILURE, "kvm_openfiles: %s", errbuf);
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kern_readonly(GMON_PROF_ON);
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}
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if (kvm_nlist(kvp->kd, nl) < 0)
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errx(EXIT_FAILURE, "%s: no namelist", sys);
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if (!nl[N_GMONPARAM].n_value)
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errx(EXIT_FAILURE, "profiling not defined in kernel");
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return (openmode);
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}
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/*
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* Suppress options that require a writable kernel.
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*/
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static void
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kern_readonly(int mode)
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{
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(void)fprintf(stderr, "%s: kernel read-only: ", getprogname());
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if (pflag && mode == GMON_PROF_ON)
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(void)fprintf(stderr, "data may be inconsistent\n");
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if (rflag)
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(void)fprintf(stderr, "-r supressed\n");
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if (bflag)
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(void)fprintf(stderr, "-b supressed\n");
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if (hflag)
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(void)fprintf(stderr, "-h supressed\n");
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rflag = bflag = hflag = 0;
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}
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/*
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* Get the state of kernel profiling.
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*/
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static int
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getprof(struct kvmvars *kvp)
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{
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int mib[3];
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size_t size;
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if (kflag) {
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size = kvm_read(kvp->kd, nl[N_GMONPARAM].n_value, &kvp->gpm,
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sizeof kvp->gpm);
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} else {
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROF;
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mib[2] = GPROF_GMONPARAM;
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size = sizeof kvp->gpm;
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if (sysctl(mib, 3, &kvp->gpm, &size, NULL, 0) < 0)
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size = 0;
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}
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if (size != sizeof kvp->gpm)
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errx(EXIT_FAILURE, "cannot get gmonparam: %s",
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kflag ? kvm_geterr(kvp->kd) : strerror(errno));
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return (kvp->gpm.state);
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}
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/*
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* Enable or disable kernel profiling according to the state variable.
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*/
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static void
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setprof(struct kvmvars *kvp, int state)
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{
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struct gmonparam *p = (struct gmonparam *)nl[N_GMONPARAM].n_value;
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int mib[3], oldstate;
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size_t sz;
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sz = sizeof(state);
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if (!kflag) {
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROF;
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mib[2] = GPROF_STATE;
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if (sysctl(mib, 3, &oldstate, &sz, NULL, 0) < 0)
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goto bad;
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if (oldstate == state)
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return;
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(void)seteuid(0);
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if (sysctl(mib, 3, NULL, NULL, &state, sz) >= 0) {
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(void)seteuid(getuid());
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return;
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}
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(void)seteuid(getuid());
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} else if ((size_t)kvm_write(kvp->kd, (u_long)&p->state, (void *)&state, sz)
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== sz)
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return;
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bad:
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warnx("cannot turn profiling %s", state == GMON_PROF_OFF ?
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"off" : "on");
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}
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/*
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* Build the gmon.out file.
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*/
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static void
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dumpstate(struct kvmvars *kvp)
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{
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FILE *fp;
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struct rawarc rawarc;
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struct tostruct *tos;
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u_long frompc;
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u_short *froms, *tickbuf;
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int mib[3];
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size_t i;
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struct gmonhdr h;
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int fromindex, endfrom, toindex;
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size_t kcountsize;
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setprof(kvp, GMON_PROF_OFF);
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fp = fopen("gmon.out", "w");
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if (fp == NULL) {
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warn("cannot open `gmon.out'");
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return;
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}
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/*
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* Build the gmon header and write it to a file.
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*/
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bzero(&h, sizeof(h));
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h.lpc = kvp->gpm.lowpc;
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h.hpc = kvp->gpm.highpc;
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h.ncnt = kvp->gpm.kcountsize + sizeof(h);
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h.version = GMONVERSION;
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h.profrate = getprofhz(kvp);
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if (fwrite(&h, sizeof(h), 1, fp) != 1)
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err(EXIT_FAILURE, "writing header to gmon.out");
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kcountsize = (size_t)kvp->gpm.kcountsize;
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/*
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* Write out the tick buffer.
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*/
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROF;
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if ((tickbuf = malloc(kcountsize)) == NULL)
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err(EXIT_FAILURE, "Cannot allocate %zu kcount space",
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kcountsize);
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if (kflag) {
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i = kvm_read(kvp->kd, (u_long)kvp->gpm.kcount, tickbuf,
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kcountsize);
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} else {
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mib[2] = GPROF_COUNT;
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i = kcountsize;
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if (sysctl(mib, 3, tickbuf, &i, NULL, 0) < 0)
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i = 0;
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}
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if (i != kcountsize)
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errx(EXIT_FAILURE, "read ticks: read %zu, got %zu: %s",
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kcountsize, i,
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kflag ? kvm_geterr(kvp->kd) : strerror(errno));
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if ((fwrite(tickbuf, kcountsize, 1, fp)) != 1)
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err(EXIT_FAILURE, "writing ticks to gmon.out");
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free(tickbuf);
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/*
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* Write out the arc info.
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*/
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if ((froms = malloc((size_t)kvp->gpm.fromssize)) == NULL)
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err(EXIT_FAILURE, "cannot allocate %zu froms space",
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(size_t)kvp->gpm.fromssize);
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if (kflag) {
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i = kvm_read(kvp->kd, (u_long)kvp->gpm.froms, froms,
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(size_t)kvp->gpm.fromssize);
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} else {
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mib[2] = GPROF_FROMS;
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i = kvp->gpm.fromssize;
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if (sysctl(mib, 3, froms, &i, NULL, 0) < 0)
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i = 0;
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}
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if (i != kvp->gpm.fromssize)
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errx(EXIT_FAILURE, "read froms: read %lu, got %lu: %s",
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kvp->gpm.fromssize, (u_long)i,
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kflag ? kvm_geterr(kvp->kd) : strerror(errno));
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if ((tos = malloc((size_t)kvp->gpm.tossize)) == NULL)
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err(EXIT_FAILURE, "cannot allocate %zu tos space",
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(size_t)kvp->gpm.tossize);
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if (kflag) {
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i = kvm_read(kvp->kd, (u_long)kvp->gpm.tos, (void *)tos,
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(size_t)kvp->gpm.tossize);
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} else {
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mib[2] = GPROF_TOS;
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i = kvp->gpm.tossize;
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if (sysctl(mib, 3, tos, &i, NULL, 0) < 0)
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i = 0;
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}
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if (i != kvp->gpm.tossize)
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errx(EXIT_FAILURE, "read tos: read %zu, got %zu: %s",
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(size_t)kvp->gpm.tossize, i,
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kflag ? kvm_geterr(kvp->kd) : strerror(errno));
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if (debug)
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(void)fprintf(stderr, "%s: lowpc 0x%lx, textsize 0x%lx\n",
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getprogname(), kvp->gpm.lowpc, kvp->gpm.textsize);
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endfrom = kvp->gpm.fromssize / sizeof(*froms);
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for (fromindex = 0; fromindex < endfrom; ++fromindex) {
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if (froms[fromindex] == 0)
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continue;
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frompc = (u_long)kvp->gpm.lowpc +
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(fromindex * kvp->gpm.hashfraction * sizeof(*froms));
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for (toindex = froms[fromindex]; toindex != 0;
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toindex = tos[toindex].link) {
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if (debug)
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(void)fprintf(stderr,
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"%s: [mcleanup] frompc 0x%lx selfpc 0x%lx count %ld\n",
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getprogname(), frompc, tos[toindex].selfpc,
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tos[toindex].count);
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rawarc.raw_frompc = frompc;
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rawarc.raw_selfpc = (u_long)tos[toindex].selfpc;
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rawarc.raw_count = tos[toindex].count;
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if (fwrite(&rawarc, sizeof(rawarc), 1,fp) != 1){
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err(EXIT_FAILURE,
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"writing raw arc to gmon.out");
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}
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}
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}
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free(tos);
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(void)fclose(fp);
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}
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/*
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* Get the profiling rate.
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*/
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static int
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getprofhz(struct kvmvars *kvp)
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{
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int mib[2], profrate;
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size_t size;
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struct clockinfo clockrate;
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if (kflag) {
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profrate = 1;
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if (kvm_read(kvp->kd, nl[N_PROFHZ].n_value, &profrate,
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sizeof profrate) != sizeof profrate)
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warnx("get clockrate: %s", kvm_geterr(kvp->kd));
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return (profrate);
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}
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mib[0] = CTL_KERN;
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mib[1] = KERN_CLOCKRATE;
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clockrate.profhz = 1;
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size = sizeof clockrate;
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if (sysctl(mib, 2, &clockrate, &size, NULL, 0) < 0)
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warn("get clockrate");
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return (clockrate.profhz);
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}
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/*
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* Reset the kernel profiling date structures.
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*/
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static void
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reset(struct kvmvars *kvp)
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{
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char *zbuf;
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size_t biggest;
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int mib[3];
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setprof(kvp, GMON_PROF_OFF);
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biggest = (size_t)kvp->gpm.kcountsize;
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if ((size_t)kvp->gpm.fromssize > biggest)
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biggest = (size_t)kvp->gpm.fromssize;
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if ((size_t)kvp->gpm.tossize > biggest)
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biggest = (size_t)kvp->gpm.tossize;
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if ((zbuf = malloc(biggest)) == NULL)
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err(EXIT_FAILURE, "cannot allocate zbuf space");
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(void)memset(zbuf, 0, biggest);
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if (kflag) {
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if ((size_t)kvm_write(kvp->kd, (u_long)kvp->gpm.kcount, zbuf,
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(size_t)kvp->gpm.kcountsize) != kvp->gpm.kcountsize)
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errx(EXIT_FAILURE, "tickbuf zero: %s",
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kvm_geterr(kvp->kd));
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if ((size_t)kvm_write(kvp->kd, (u_long)kvp->gpm.froms, zbuf,
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(size_t)kvp->gpm.fromssize) != kvp->gpm.fromssize)
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errx(EXIT_FAILURE, "froms zero: %s",
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kvm_geterr(kvp->kd));
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if ((size_t)kvm_write(kvp->kd, (u_long)kvp->gpm.tos, zbuf,
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(size_t)kvp->gpm.tossize) != kvp->gpm.tossize)
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errx(EXIT_FAILURE, "tos zero: %s", kvm_geterr(kvp->kd));
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free(zbuf);
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return;
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}
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(void)seteuid(0);
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROF;
|
|
mib[2] = GPROF_COUNT;
|
|
if (sysctl(mib, 3, NULL, NULL, zbuf, (size_t)kvp->gpm.kcountsize) < 0)
|
|
err(EXIT_FAILURE, "tickbuf zero");
|
|
mib[2] = GPROF_FROMS;
|
|
if (sysctl(mib, 3, NULL, NULL, zbuf, (size_t)kvp->gpm.fromssize) < 0)
|
|
err(EXIT_FAILURE, "froms zero");
|
|
mib[2] = GPROF_TOS;
|
|
if (sysctl(mib, 3, NULL, NULL, zbuf, (size_t)kvp->gpm.tossize) < 0)
|
|
err(EXIT_FAILURE, "tos zero");
|
|
(void)seteuid(getuid());
|
|
free(zbuf);
|
|
}
|