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f1703dfbaa
In a nutshell, this macroizes the local/global symbol scoping rules that are different in a.out and ELF. It also makes the i386 assembler stubs conform to i386 PIC calling conventions - the a.out ld.so didn't object, but the ELF one needs it as it implements PIC jumps via PLT's as well as calls. The a.out rtld only worked because it was accidently snooping the grandparent calling function's return address off the stack.. This also affects the libc_r code a little, because of cpp macro nesting.
259 lines
6.8 KiB
C
259 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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(lint) && defined(LIBC_SCCS)
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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/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 <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#if defined(__ELF__)
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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 describe (incorrectly) */
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#define SCALE_1_TO_1 0x10000L
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#define ERR(s) write(2, s, sizeof(s))
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void moncontrol __P((int));
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static int hertz __P((void));
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void
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monstartup(lowpc, highpc)
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u_long lowpc;
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u_long highpc;
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{
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register 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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if (p->kcountsize < o) {
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#ifndef hp300
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s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
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#else /* avoid floating point */
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int quot = o / p->kcountsize;
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if (quot >= 0x10000)
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s_scale = 1;
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else if (quot >= 0x100)
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s_scale = 0x10000 / quot;
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else if (o >= 0x800000)
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s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
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else
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s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
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#endif
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} else
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s_scale = SCALE_1_TO_1;
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moncontrol(1);
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}
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void
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_mcleanup()
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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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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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fd = open("gmon.out", O_CREAT|O_TRUNC|O_WRONLY, 0666);
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if (fd < 0) {
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perror("mcount: gmon.out");
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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, 0664);
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if (log < 0) {
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perror("mcount: gmon.log");
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return;
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}
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len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\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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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%x selfpc 0x%x count %d\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(mode)
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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, (int)p->lowpc,
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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()
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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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