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src/usr.sbin/kgmon/kgmon.c

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/* $OpenBSD: kgmon.c,v 1.26 2019/06/28 13:32:48 deraadt Exp $ */
/*
* Copyright (c) 1983, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/gmon.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <nlist.h>
#include <paths.h>
struct nlist nl[] = {
#define N_GMONPARAM 0
{ "__gmonparam" },
#define N_PROFHZ 1
{ "_profhz" },
{ NULL }
};
struct kvmvars {
kvm_t *kd;
struct gmonparam gpm;
};
extern char *__progname;
int bflag, cflag, hflag, kflag, rflag, pflag;
int debug = 0;
void kgmon(char *, char *, struct kvmvars *, int);
void setprof(struct kvmvars *, int, int);
void dumpstate(struct kvmvars *, int);
void reset(struct kvmvars *, int);
void kern_readonly(int);
int getprof(struct kvmvars *, int);
int getprofhz(struct kvmvars *);
int openfiles(char *, char *, struct kvmvars *, int);
int getncpu(void);
int
main(int argc, char **argv)
{
int ch, ncpu, cpuid = -1;
struct kvmvars kvmvars;
char *sys, *kmemf;
const char *p;
kmemf = NULL;
sys = NULL;
while ((ch = getopt(argc, argv, "M:N:bc:hpr")) != -1) {
switch(ch) {
case 'M':
kmemf = optarg;
kflag = 1;
break;
case 'N':
sys = optarg;
break;
case 'b':
bflag = 1;
break;
case 'c':
cflag = 1;
cpuid = strtonum(optarg, 0, 1024, &p);
if (p)
errx(1, "illegal CPU id %s: %s", optarg, p);
break;
case 'h':
hflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'r':
rflag = 1;
break;
default:
fprintf(stderr, "usage: %s [-bhpr] "
"[-c cpuid] [-M core] [-N system]\n", __progname);
exit(1);
}
}
argc -= optind;
argv += optind;
#define BACKWARD_COMPATIBILITY
#ifdef BACKWARD_COMPATIBILITY
if (*argv) {
sys = *argv;
if (*++argv) {
kmemf = *argv;
++kflag;
}
}
#endif
if (cflag) {
kgmon(sys, kmemf, &kvmvars, cpuid);
} else {
ncpu = getncpu();
for (cpuid = 0; cpuid < ncpu; cpuid++)
kgmon(sys, kmemf, &kvmvars, cpuid);
}
return (0);
}
void
kgmon(char *sys, char *kmemf, struct kvmvars *kvp, int cpuid)
{
int mode, disp, accessmode;
accessmode = openfiles(sys, kmemf, kvp, cpuid);
mode = getprof(kvp, cpuid);
if (hflag)
disp = GMON_PROF_OFF;
else if (bflag)
disp = GMON_PROF_ON;
else
disp = mode;
if (pflag)
dumpstate(kvp, cpuid);
if (rflag)
reset(kvp, cpuid);
if (accessmode == O_RDWR)
setprof(kvp, cpuid, disp);
printf("%s: kernel profiling is %s for cpu %d.\n", __progname,
disp == GMON_PROF_OFF ? "off" : "running", cpuid);
}
/*
* Check that profiling is enabled and open any ncessary files.
*/
int
openfiles(char *sys, char *kmemf, struct kvmvars *kvp, int cpuid)
{
int mib[4], state, openmode;
size_t size;
char errbuf[_POSIX2_LINE_MAX];
if (!kflag) {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_STATE;
mib[3] = cpuid;
size = sizeof state;
if (sysctl(mib, 4, &state, &size, NULL, 0) == -1)
errx(20, "profiling not defined in kernel.");
if (!(bflag || hflag || rflag ||
(pflag && state == GMON_PROF_ON)))
return (O_RDONLY);
if (sysctl(mib, 4, NULL, NULL, &state, size) >= 0)
return (O_RDWR);
kern_readonly(state);
return (O_RDONLY);
}
openmode = (bflag || hflag || pflag || rflag) ? O_RDWR : O_RDONLY;
kvp->kd = kvm_openfiles(sys, kmemf, NULL, openmode, errbuf);
if (kvp->kd == NULL) {
if (openmode == O_RDWR) {
openmode = O_RDONLY;
kvp->kd = kvm_openfiles(sys, kmemf, NULL, O_RDONLY,
errbuf);
}
if (kvp->kd == NULL)
errx(2, "kvm_openfiles: %s", errbuf);
kern_readonly(GMON_PROF_ON);
}
if (kvm_nlist(kvp->kd, nl) == -1)
errx(3, "%s: no namelist", sys ? sys : _PATH_UNIX);
if (!nl[N_GMONPARAM].n_value)
errx(20, "profiling not defined in kernel.");
return (openmode);
}
/*
* Suppress options that require a writable kernel.
*/
void
kern_readonly(int mode)
{
extern char *__progname;
(void)fprintf(stderr, "%s: kernel read-only: ", __progname);
if (pflag && mode == GMON_PROF_ON)
(void)fprintf(stderr, "data may be inconsistent\n");
if (rflag)
(void)fprintf(stderr, "-r suppressed\n");
if (bflag)
(void)fprintf(stderr, "-b suppressed\n");
if (hflag)
(void)fprintf(stderr, "-h suppressed\n");
rflag = bflag = hflag = 0;
}
/*
* Get the state of kernel profiling.
*/
int
getprof(struct kvmvars *kvp, int cpuid)
{
int mib[4];
size_t size;
if (kflag) {
size = kvm_read(kvp->kd, nl[N_GMONPARAM].n_value, &kvp->gpm,
sizeof kvp->gpm);
} else {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_GMONPARAM;
mib[3] = cpuid;
size = sizeof kvp->gpm;
if (sysctl(mib, 4, &kvp->gpm, &size, NULL, 0) == -1)
size = 0;
}
if (size != sizeof kvp->gpm)
errx(4, "cannot get gmonparam: %s",
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
return (kvp->gpm.state);
}
/*
* Enable or disable kernel profiling according to the state variable.
*/
void
setprof(struct kvmvars *kvp, int cpuid, int state)
{
struct gmonparam *p = (struct gmonparam *)nl[N_GMONPARAM].n_value;
int mib[4], oldstate;
size_t sz;
sz = sizeof(state);
if (!kflag) {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_STATE;
mib[3] = cpuid;
if (sysctl(mib, 4, &oldstate, &sz, NULL, 0) == -1)
goto bad;
if (oldstate == state)
return;
if (sysctl(mib, 4, NULL, NULL, &state, sz) >= 0)
return;
} else if (kvm_write(kvp->kd, (u_long)&p->state, (void *)&state, sz)
== sz)
return;
bad:
warnx("warning: cannot turn profiling %s",
state == GMON_PROF_OFF ? "off" : "on");
}
/*
* Build the gmon.out file.
*/
void
dumpstate(struct kvmvars *kvp, int cpuid)
{
FILE *fp;
struct rawarc rawarc;
struct tostruct *tos;
u_long frompc;
u_short *froms, *tickbuf;
int mib[4];
size_t i;
struct gmonhdr h;
int fromindex, endfrom, toindex;
char buf[16];
snprintf(buf, sizeof(buf), "gmon-%02d.out", cpuid);
setprof(kvp, cpuid, GMON_PROF_OFF);
fp = fopen(buf, "w");
if (fp == 0) {
perror(buf);
return;
}
/*
* Build the gmon header and write it to a file.
*/
bzero(&h, sizeof(h));
h.lpc = kvp->gpm.lowpc;
h.hpc = kvp->gpm.highpc;
h.ncnt = kvp->gpm.kcountsize + sizeof(h);
h.version = GMONVERSION;
h.profrate = getprofhz(kvp);
fwrite((char *)&h, sizeof(h), 1, fp);
/*
* Write out the tick buffer.
*/
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
if ((tickbuf = malloc(kvp->gpm.kcountsize)) == NULL)
errx(5, "cannot allocate kcount space");
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.kcount, (void *)tickbuf,
kvp->gpm.kcountsize);
} else {
mib[2] = GPROF_COUNT;
mib[3] = cpuid;
i = kvp->gpm.kcountsize;
if (sysctl(mib, 4, tickbuf, &i, NULL, 0) == -1)
i = 0;
}
if (i != kvp->gpm.kcountsize)
errx(6, "read ticks: read %lu, got %zu: %s",
kvp->gpm.kcountsize, i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
if ((fwrite(tickbuf, kvp->gpm.kcountsize, 1, fp)) != 1)
err(7, "writing tocks to gmon.out");
free(tickbuf);
/*
* Write out the arc info.
*/
if ((froms = malloc(kvp->gpm.fromssize)) == NULL)
errx(8, "cannot allocate froms space");
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.froms, (void *)froms,
kvp->gpm.fromssize);
} else {
mib[2] = GPROF_FROMS;
mib[3] = cpuid;
i = kvp->gpm.fromssize;
if (sysctl(mib, 4, froms, &i, NULL, 0) == -1)
i = 0;
}
if (i != kvp->gpm.fromssize)
errx(9, "read froms: read %lu, got %zu: %s",
kvp->gpm.fromssize, i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
if ((tos = malloc(kvp->gpm.tossize)) == NULL)
errx(10, "cannot allocate tos space");
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.tos, (void *)tos,
kvp->gpm.tossize);
} else {
mib[2] = GPROF_TOS;
mib[3] = cpuid;
i = kvp->gpm.tossize;
if (sysctl(mib, 4, tos, &i, NULL, 0) == -1)
i = 0;
}
if (i != kvp->gpm.tossize)
errx(11, "read tos: read %lu, got %zu: %s",
kvp->gpm.tossize, i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
if (debug)
warnx("lowpc 0x%lx, textsize 0x%lx",
kvp->gpm.lowpc, kvp->gpm.textsize);
endfrom = kvp->gpm.fromssize / sizeof(*froms);
for (fromindex = 0; fromindex < endfrom; ++fromindex) {
if (froms[fromindex] == 0)
continue;
frompc = (u_long)kvp->gpm.lowpc +
(fromindex * kvp->gpm.hashfraction * sizeof(*froms));
for (toindex = froms[fromindex]; toindex != 0;
toindex = tos[toindex].link) {
if (debug)
warnx("[mcleanup] frompc 0x%lx selfpc 0x%lx count %ld",
frompc, tos[toindex].selfpc, tos[toindex].count);
rawarc.raw_frompc = frompc;
rawarc.raw_selfpc = (u_long)tos[toindex].selfpc;
rawarc.raw_count = tos[toindex].count;
fwrite((char *)&rawarc, sizeof(rawarc), 1, fp);
}
}
fclose(fp);
}
/*
* Get the profiling rate.
*/
int
getprofhz(struct kvmvars *kvp)
{
int mib[2], profrate;
size_t size;
struct clockinfo clockrate;
if (kflag) {
profrate = 1;
if (kvm_read(kvp->kd, nl[N_PROFHZ].n_value, &profrate,
sizeof profrate) != sizeof profrate)
warnx("get clockrate: %s", kvm_geterr(kvp->kd));
return (profrate);
}
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
clockrate.profhz = 1;
size = sizeof clockrate;
if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
warn("get clockrate");
return (clockrate.profhz);
}
/*
* Reset the kernel profiling date structures.
*/
void
reset(struct kvmvars *kvp, int cpuid)
{
char *zbuf;
u_long biggest;
int mib[4];
setprof(kvp, cpuid, GMON_PROF_OFF);
biggest = kvp->gpm.kcountsize;
if (kvp->gpm.fromssize > biggest)
biggest = kvp->gpm.fromssize;
if (kvp->gpm.tossize > biggest)
biggest = kvp->gpm.tossize;
if ((zbuf = malloc(biggest)) == NULL)
errx(12, "cannot allocate zbuf space");
bzero(zbuf, biggest);
if (kflag) {
if (kvm_write(kvp->kd, (u_long)kvp->gpm.kcount, zbuf,
kvp->gpm.kcountsize) != kvp->gpm.kcountsize)
errx(13, "tickbuf zero: %s", kvm_geterr(kvp->kd));
if (kvm_write(kvp->kd, (u_long)kvp->gpm.froms, zbuf,
kvp->gpm.fromssize) != kvp->gpm.fromssize)
errx(14, "froms zero: %s", kvm_geterr(kvp->kd));
if (kvm_write(kvp->kd, (u_long)kvp->gpm.tos, zbuf,
kvp->gpm.tossize) != kvp->gpm.tossize)
errx(15, "tos zero: %s", kvm_geterr(kvp->kd));
return;
}
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_COUNT;
mib[3] = cpuid;
if (sysctl(mib, 4, NULL, NULL, zbuf, kvp->gpm.kcountsize) == -1)
err(13, "tickbuf zero");
mib[2] = GPROF_FROMS;
if (sysctl(mib, 4, NULL, NULL, zbuf, kvp->gpm.fromssize) == -1)
err(14, "froms zero");
mib[2] = GPROF_TOS;
if (sysctl(mib, 4, NULL, NULL, zbuf, kvp->gpm.tossize) == -1)
err(15, "tos zero");
free(zbuf);
}
int
getncpu(void)
{
int mib[2] = { CTL_HW, HW_NCPU };
size_t size;
int ncpu;
size = sizeof(ncpu);
if (sysctl(mib, 2, &ncpu, &size, NULL, 0) == -1) {
warnx("cannot read hw.ncpu");
return (1);
}
return (ncpu);
}
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