Subversion Repositories scarts

/*-

 * Copyright (c) 1991, 2000 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.

 */

/*

 * This is a modified gmon.c by J.W.Hawtin <oolon@ankh.org>,

 * 14/8/96 based on the original gmon.c in GCC and the hacked version

 * solaris 2 sparc version (config/sparc/gmon-sol.c) by Mark Eichin. To do

 * process profiling on solaris 2.X X86

 *

 * It must be used in conjunction with sol2-gc1.asm, which is used to start

 * and stop process monitoring.

 *

 * Differences.

 *

 * On Solaris 2 _mcount is called by library functions not mcount, so support

 * has been added for both.

 *

 * Also the prototype for profil() is different

 *

 * Solaris 2 does not seem to have char *minbrk which allows the setting of

 * the minimum SBRK region so this code has been removed and lets pray malloc

 * does not mess it up.

 *

 * Notes

 *

 * This code could easily be integrated with the original gmon.c and perhaps

 * should be.

 */

#ifndef lint

static char sccsid[] = "@(#)gmon.c      5.3 (Berkeley) 5/22/91";

#endif /* not lint */

#define DEBUG

#ifdef DEBUG

#include <stdio.h>

#endif

#include "cygmon-gmon.h"

/*

 *      froms is actually a bunch of unsigned shorts indexing tos

 */

static int              profiling = 3;

static unsigned short   *froms;

static struct tostruct  *tos = 0;

static long             tolimit = 0;

static char             *s_lowpc = 0;

static char             *s_highpc = 0;

static unsigned long    s_textsize = 0;

static int      ssiz;

static char     *sbuf;

static int      s_scale;

    /* see profil(2) where this is describe (incorrectly) */

#define         SCALE_1_TO_1    0x10000L

#define MSG "No space for profiling buffer(s)\n"

extern int errno;

int

monstartup(lowpc, highpc)

     char       *lowpc;

     char       *highpc;

{

  int           monsize;

  char          *buffer;

  register int  o;

        /*

         *      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.

         */

  lowpc = (char *)

    ROUNDDOWN((unsigned)lowpc, HISTFRACTION*sizeof(HISTCOUNTER));

  s_lowpc = lowpc;

  highpc = (char *)

    ROUNDUP((unsigned)highpc, HISTFRACTION*sizeof(HISTCOUNTER));

  s_highpc = highpc;

  s_textsize = highpc - lowpc;

  monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr);

  buffer = (char *) sbrk (monsize);

  if (buffer == (char *) -1)

    {

      write (2, MSG , sizeof(MSG));

      return;

    }

  bzero (buffer, monsize);

  froms = (unsigned short *) sbrk (s_textsize / HASHFRACTION);

  if (froms == (unsigned short *) -1)

    {

      write(2, MSG, sizeof(MSG));

      froms = 0;

      return;

    }

  bzero (froms, s_textsize / HASHFRACTION);

  tolimit = s_textsize * ARCDENSITY / 100;

  if (tolimit < MINARCS)

    {

      tolimit = MINARCS;

    }

  else

    {

      if (tolimit > 65534)

        {

          tolimit = 65534;

        }

    }

  tos = (struct tostruct *) sbrk( tolimit * sizeof( struct tostruct ) );

  if (tos == (struct tostruct *) -1)

    {

      write (2, MSG, sizeof(MSG));

      froms = 0;

      tos = 0;

      return;

    }

  bzero (tos, tolimit * sizeof( struct tostruct ) );

  tos[0].link = 0;

  sbuf = buffer;

  ssiz = monsize;

  ( (struct phdr *) buffer ) -> lpc = lowpc;

  ( (struct phdr *) buffer ) -> hpc = highpc;

  ( (struct phdr *) buffer ) -> ncnt = ssiz;

  monsize -= sizeof(struct phdr);

  if ( monsize <= 0 )

    return;

  o = highpc - lowpc;

  if (monsize < o)

    {

        s_scale = ( (float) monsize / o ) * SCALE_1_TO_1;

    }

  else

    s_scale = SCALE_1_TO_1;

  moncontrol (1);

}

void

_mcleanup()

{

  int           fd;

  int           fromindex;

  int           endfrom;

  char          *frompc;

  int           toindex;

  struct rawarc rawarc;

  moncontrol (0);

  profil_write (1, sbuf, ssiz);

  endfrom = s_textsize / (HASHFRACTION * sizeof(*froms));

  for ( fromindex = 0 ; fromindex < endfrom ; fromindex++ )

    {

      if ( froms[fromindex] == 0 )

        {

          continue;

        }

      frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms));

      for (toindex=froms[fromindex]; toindex!=0; toindex=tos[toindex].link)

        {

          rawarc.raw_frompc = (unsigned long) frompc;

          rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;

          rawarc.raw_count = tos[toindex].count;

          profil_write (2, &rawarc, sizeof (rawarc));

        }

    }

  profil_write (3, 0, 0);

}

static char already_setup = 0;

_mcount()

{

  register char                 *selfpc;

  register unsigned short       *frompcindex;

  register struct tostruct      *top;

  register struct tostruct      *prevtop;

  register long                 toindex;

  /*

   *    find the return address for mcount,

   *    and the return address for mcount's caller.

   */

  /* selfpc = pc pushed by mcount call.

     This identifies the function that was just entered.  */

  selfpc = (void *) __builtin_return_address (0);

  /* frompcindex = pc in preceding frame.

     This identifies the caller of the function just entered.  */

  frompcindex = (void *) __builtin_return_address (1);

  if (! already_setup)

    {

      extern _etext();

      extern _ftext();

      already_setup = 1;

      monstartup(_ftext, _etext);

      atexit(_mcleanup);

    }

  /*

   *    check that we are profiling

   *    and that we aren't recursively invoked.

   */

  if (profiling)

    {

      goto out;

    }

  profiling++;

  /*

   *    check that frompcindex is a reasonable pc value.

   *    for example:    signal catchers get called from the stack,

   *                    not from text space.  too bad.

   */

  frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc);

  if ((unsigned long)frompcindex > s_textsize)

    {

      goto done;

    }

  frompcindex =

    &froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))];

  toindex = *frompcindex;

  if (toindex == 0)

    {

      /*

       *        first time traversing this arc

       */

      toindex = ++tos[0].link;

      if (toindex >= tolimit)

        {

          goto overflow;

        }

      *frompcindex = toindex;

      top = &tos[toindex];

      top->selfpc = selfpc;

      top->count = 1;

      top->link = 0;

      goto done;

    }

  top = &tos[toindex];

  if (top->selfpc == selfpc)

    {

      /*

       *        arc at front of chain; usual case.

       */

      top->count++;

      goto done;

    }

  /*

   *    have to go looking down chain for it.

   *    top points to what we are looking at,

   *    prevtop points to previous top.

   *    we know it is not at the head of the chain.

   */

  for (; /* goto done */; )

    {

      if (top->link == 0)

        {

          /*

           *    top is end of the chain and none of the chain

           *    had top->selfpc == selfpc.

           *    so we allocate a new tostruct

           *    and link it to the head of the chain.

           */

          toindex = ++tos[0].link;

          if (toindex >= tolimit)

            {

              goto overflow;

            }

          top = &tos[toindex];

          top->selfpc = selfpc;

          top->count = 1;

          top->link = *frompcindex;

          *frompcindex = toindex;

          goto done;

        }

      /*

       *        otherwise, check the next arc on the chain.

       */

      prevtop = top;

      top = &tos[top->link];

      if (top->selfpc == selfpc)

        {

          /*

           *    there it is.

           *    increment its count

           *    move it to the head of the chain.

           */

          top->count++;

          toindex = prevtop->link;

          prevtop->link = top->link;

          top->link = *frompcindex;

          *frompcindex = toindex;

          goto done;

        }

    }

done:

  profiling--;

  /* and fall through */

out:

  return;               /* normal return restores saved registers */

overflow:

  profiling++; /* halt further profiling */

#   define      TOLIMIT "mcount: tos overflow\n"

  write (2, TOLIMIT, sizeof(TOLIMIT));

  goto out;

}

/*

 * Control profiling

 *      profiling is what mcount checks to see if

 *      all the data structures are ready.

 */

moncontrol(mode)

    int mode;

{

  if (mode)

    {

      /* start */

      profil((unsigned short *)(sbuf + sizeof(struct phdr)),

             ssiz - sizeof(struct phdr),

             (int)s_lowpc, s_scale);

      profiling = 0;

    }

  else

    {

      /* stop */

      profil((unsigned short *)0, 0, 0, 0);

      profiling = 3;

    }

}