359 lines
9.0 KiB
C
359 lines
9.0 KiB
C
/*-
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* Copyright (c) 1991, 2000 The Regents of the University of California.
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* 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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/*
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* This is a modified gmon.c by J.W.Hawtin <oolon@ankh.org>,
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* 14/8/96 based on the original gmon.c in GCC and the hacked version
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* solaris 2 sparc version (config/sparc/gmon-sol.c) by Mark Eichin. To do
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* process profiling on solaris 2.X X86
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*
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* It must be used in conjunction with sol2-gc1.asm, which is used to start
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* and stop process monitoring.
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*
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* Differences.
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*
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* On Solaris 2 _mcount is called by library functions not mcount, so support
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* has been added for both.
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*
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* Also the prototype for profil() is different
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*
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* Solaris 2 does not seem to have char *minbrk which allows the setting of
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* the minimum SBRK region so this code has been removed and lets pray malloc
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* does not mess it up.
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*
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* Notes
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*
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* This code could easily be integrated with the original gmon.c and perhaps
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* should be.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)gmon.c 5.3 (Berkeley) 5/22/91";
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#endif /* not lint */
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#define DEBUG
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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#include "cygmon-gmon.h"
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/*
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* froms is actually a bunch of unsigned shorts indexing tos
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*/
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static int profiling = 3;
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static unsigned short *froms;
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static struct tostruct *tos = 0;
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static long tolimit = 0;
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static char *s_lowpc = 0;
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static char *s_highpc = 0;
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static unsigned long s_textsize = 0;
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static int ssiz;
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static char *sbuf;
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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 MSG "No space for profiling buffer(s)\n"
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extern int errno;
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int
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monstartup(lowpc, highpc)
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char *lowpc;
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char *highpc;
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{
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int monsize;
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char *buffer;
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register int o;
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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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lowpc = (char *)
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ROUNDDOWN((unsigned)lowpc, HISTFRACTION*sizeof(HISTCOUNTER));
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s_lowpc = lowpc;
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highpc = (char *)
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ROUNDUP((unsigned)highpc, HISTFRACTION*sizeof(HISTCOUNTER));
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s_highpc = highpc;
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s_textsize = highpc - lowpc;
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monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr);
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buffer = (char *) sbrk (monsize);
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if (buffer == (char *) -1)
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{
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write (2, MSG , sizeof(MSG));
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return;
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}
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bzero (buffer, monsize);
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froms = (unsigned short *) sbrk (s_textsize / HASHFRACTION);
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if (froms == (unsigned short *) -1)
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{
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write(2, MSG, sizeof(MSG));
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froms = 0;
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return;
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}
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bzero (froms, s_textsize / HASHFRACTION);
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tolimit = s_textsize * ARCDENSITY / 100;
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if (tolimit < MINARCS)
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{
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tolimit = MINARCS;
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}
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else
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{
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if (tolimit > 65534)
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{
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tolimit = 65534;
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}
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}
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tos = (struct tostruct *) sbrk( tolimit * sizeof( struct tostruct ) );
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if (tos == (struct tostruct *) -1)
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{
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write (2, MSG, sizeof(MSG));
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froms = 0;
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tos = 0;
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return;
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}
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bzero (tos, tolimit * sizeof( struct tostruct ) );
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tos[0].link = 0;
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sbuf = buffer;
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ssiz = monsize;
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( (struct phdr *) buffer ) -> lpc = lowpc;
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( (struct phdr *) buffer ) -> hpc = highpc;
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( (struct phdr *) buffer ) -> ncnt = ssiz;
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monsize -= sizeof(struct phdr);
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if ( monsize <= 0 )
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return;
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o = highpc - lowpc;
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if (monsize < o)
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{
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s_scale = ( (float) monsize / o ) * SCALE_1_TO_1;
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}
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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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char *frompc;
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int toindex;
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struct rawarc rawarc;
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moncontrol (0);
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profil_write (1, sbuf, ssiz);
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endfrom = s_textsize / (HASHFRACTION * sizeof(*froms));
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for ( fromindex = 0 ; fromindex < endfrom ; fromindex++ )
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{
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if ( froms[fromindex] == 0 )
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{
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continue;
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}
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frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms));
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for (toindex=froms[fromindex]; toindex!=0; toindex=tos[toindex].link)
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{
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rawarc.raw_frompc = (unsigned long) frompc;
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rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;
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rawarc.raw_count = tos[toindex].count;
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profil_write (2, &rawarc, sizeof (rawarc));
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}
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}
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profil_write (3, 0, 0);
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}
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static char already_setup = 0;
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_mcount()
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{
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register char *selfpc;
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register unsigned short *frompcindex;
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register struct tostruct *top;
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register struct tostruct *prevtop;
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register long toindex;
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/*
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* find the return address for mcount,
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* and the return address for mcount's caller.
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*/
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/* selfpc = pc pushed by mcount call.
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This identifies the function that was just entered. */
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selfpc = (void *) __builtin_return_address (0);
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/* frompcindex = pc in preceding frame.
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This identifies the caller of the function just entered. */
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frompcindex = (void *) __builtin_return_address (1);
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if (! already_setup)
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{
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extern _etext();
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extern _ftext();
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already_setup = 1;
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monstartup(_ftext, _etext);
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atexit(_mcleanup);
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}
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/*
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* check that we are profiling
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* and that we aren't recursively invoked.
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*/
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if (profiling)
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{
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goto out;
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}
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profiling++;
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/*
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* check that frompcindex is a reasonable pc value.
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* for example: signal catchers get called from the stack,
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* not from text space. too bad.
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*/
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frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc);
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if ((unsigned long)frompcindex > s_textsize)
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{
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goto done;
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}
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frompcindex =
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&froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))];
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toindex = *frompcindex;
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if (toindex == 0)
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{
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/*
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* first time traversing this arc
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*/
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toindex = ++tos[0].link;
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if (toindex >= tolimit)
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{
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goto overflow;
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}
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*frompcindex = toindex;
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top = &tos[toindex];
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top->selfpc = selfpc;
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top->count = 1;
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top->link = 0;
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goto done;
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}
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top = &tos[toindex];
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if (top->selfpc == selfpc)
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{
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/*
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* arc at front of chain; usual case.
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*/
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top->count++;
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goto done;
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}
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/*
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* have to go looking down chain for it.
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* top points to what we are looking at,
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* prevtop points to previous top.
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* we know it is not at the head of the chain.
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*/
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for (; /* goto done */; )
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{
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if (top->link == 0)
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{
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/*
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* top is end of the chain and none of the chain
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* had top->selfpc == selfpc.
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* so we allocate a new tostruct
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* and link it to the head of the chain.
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*/
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toindex = ++tos[0].link;
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if (toindex >= tolimit)
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{
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goto overflow;
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}
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top = &tos[toindex];
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top->selfpc = selfpc;
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top->count = 1;
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top->link = *frompcindex;
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*frompcindex = toindex;
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goto done;
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}
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/*
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* otherwise, check the next arc on the chain.
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*/
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prevtop = top;
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top = &tos[top->link];
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if (top->selfpc == selfpc)
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{
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/*
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* there it is.
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* increment its count
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* move it to the head of the chain.
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*/
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top->count++;
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toindex = prevtop->link;
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prevtop->link = top->link;
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top->link = *frompcindex;
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*frompcindex = toindex;
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goto done;
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}
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}
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done:
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profiling--;
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/* and fall through */
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out:
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return; /* normal return restores saved registers */
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overflow:
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profiling++; /* halt further profiling */
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# define TOLIMIT "mcount: tos overflow\n"
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write (2, TOLIMIT, sizeof(TOLIMIT));
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goto out;
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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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moncontrol(mode)
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int mode;
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{
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if (mode)
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{
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/* start */
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profil((unsigned short *)(sbuf + sizeof(struct phdr)),
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ssiz - sizeof(struct phdr),
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(int)s_lowpc, s_scale);
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profiling = 0;
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}
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else
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{
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/* stop */
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profil((unsigned short *)0, 0, 0, 0);
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profiling = 3;
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}
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}
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