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Diffstat (limited to 'gmon/gmon.c')
| -rw-r--r-- | gmon/gmon.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/gmon/gmon.c b/gmon/gmon.c new file mode 100644 index 0000000..df528e2 --- /dev/null +++ b/gmon/gmon.c @@ -0,0 +1,232 @@ +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#if !defined(lint) && defined(LIBC_SCCS) +static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93"; +#endif + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/gmon.h> + +#include <stdio.h> +#include <fcntl.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +struct gmonparam _gmonparam = { GMON_PROF_OFF }; + +static int s_scale; +/* see profil(2) where this is describe (incorrectly) */ +#define SCALE_1_TO_1 0x10000L + +#define ERR(s) write(2, s, sizeof(s) - 1) + +void moncontrol __P((int)); +static int hertz __P((void)); + +void +monstartup(lowpc, highpc) + u_long lowpc; + u_long highpc; +{ + register int o; + char *cp; + struct gmonparam *p = &_gmonparam; + + /* + * round lowpc and highpc to multiples of the density we're using + * so the rest of the scaling (here and in gprof) stays in ints. + */ + p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); + p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); + p->textsize = p->highpc - p->lowpc; + p->kcountsize = p->textsize / HISTFRACTION; + p->hashfraction = HASHFRACTION; + p->fromssize = p->textsize / HASHFRACTION; + p->tolimit = p->textsize * ARCDENSITY / 100; + if (p->tolimit < MINARCS) + p->tolimit = MINARCS; + else if (p->tolimit > MAXARCS) + p->tolimit = MAXARCS; + p->tossize = p->tolimit * sizeof(struct tostruct); + + cp = malloc (p->kcountsize + p->fromssize + p->tossize); + if (! cp) { + ERR("monstartup: out of memory\n"); + return; + } + bzero(cp, p->kcountsize + p->fromssize + p->tossize); + p->tos = (struct tostruct *)cp; + cp += p->tossize; + p->kcount = (u_short *)cp; + cp += p->kcountsize; + p->froms = (u_short *)cp; + + p->tos[0].link = 0; + + o = p->highpc - p->lowpc; + if (p->kcountsize < o) { +#ifndef hp300 + s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; +#else /* avoid floating point */ + int quot = o / p->kcountsize; + + if (quot >= 0x10000) + s_scale = 1; + else if (quot >= 0x100) + s_scale = 0x10000 / quot; + else if (o >= 0x800000) + s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); + else + s_scale = 0x1000000 / ((o << 8) / p->kcountsize); +#endif + } else + s_scale = SCALE_1_TO_1; + + moncontrol(1); +} + +void +_mcleanup() +{ + int fd; + int fromindex; + int endfrom; + u_long frompc; + int toindex; + struct rawarc rawarc; + struct gmonparam *p = &_gmonparam; + struct gmonhdr gmonhdr, *hdr; +#ifdef DEBUG + int log, len; + char buf[200]; +#endif + + if (p->state == GMON_PROF_ERROR) + ERR("_mcleanup: tos overflow\n"); + + moncontrol(0); + fd = open("gmon.out", O_CREAT|O_TRUNC|O_WRONLY, 0666); + if (fd < 0) { + perror("mcount: gmon.out"); + return; + } +#ifdef DEBUG + log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); + if (log < 0) { + perror("mcount: gmon.log"); + return; + } + len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n", + p->kcount, p->kcountsize); + write(log, buf, len); +#endif + hdr = (struct gmonhdr *)&gmonhdr; + hdr->lpc = p->lowpc; + hdr->hpc = p->highpc; + hdr->ncnt = p->kcountsize + sizeof(gmonhdr); + hdr->version = GMONVERSION; + hdr->profrate = hertz(); + write(fd, (char *)hdr, sizeof *hdr); + write(fd, p->kcount, p->kcountsize); + endfrom = p->fromssize / sizeof(*p->froms); + for (fromindex = 0; fromindex < endfrom; fromindex++) { + if (p->froms[fromindex] == 0) + continue; + + frompc = p->lowpc; + frompc += fromindex * p->hashfraction * sizeof(*p->froms); + for (toindex = p->froms[fromindex]; toindex != 0; + toindex = p->tos[toindex].link) { +#ifdef DEBUG + len = sprintf(buf, + "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" , + frompc, p->tos[toindex].selfpc, + p->tos[toindex].count); + write(log, buf, len); +#endif + rawarc.raw_frompc = frompc; + rawarc.raw_selfpc = p->tos[toindex].selfpc; + rawarc.raw_count = p->tos[toindex].count; + write(fd, &rawarc, sizeof rawarc); + } + } + close(fd); +} + +/* + * Control profiling + * profiling is what mcount checks to see if + * all the data structures are ready. + */ +void +moncontrol(mode) + int mode; +{ + struct gmonparam *p = &_gmonparam; + + if (mode) { + /* start */ + profil((char *)p->kcount, p->kcountsize, (int)p->lowpc, + s_scale); + p->state = GMON_PROF_ON; + } else { + /* stop */ + profil((char *)0, 0, 0, 0); + p->state = GMON_PROF_OFF; + } +} + +/* + * discover the tick frequency of the machine + * if something goes wrong, we return 0, an impossible hertz. + */ +static int +hertz() +{ + struct itimerval tim; + + tim.it_interval.tv_sec = 0; + tim.it_interval.tv_usec = 1; + tim.it_value.tv_sec = 0; + tim.it_value.tv_usec = 0; + setitimer(ITIMER_REAL, &tim, 0); + setitimer(ITIMER_REAL, 0, &tim); + if (tim.it_interval.tv_usec < 2) + return(0); + return (1000000 / tim.it_interval.tv_usec); +} + + |