osprey/kg++fe/gnu/config/i386/gmon-sol2.c

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/*-
 * Copyright (c) 1991 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. [rescinded 22 July 1999]
 * 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 whcih 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 */

#if 0
#include <unistd.h>

#endif
#ifdef DEBUG
#include <stdio.h>
#endif

#if 0
#include "i386/gmon.h"
#else

struct phdr {
                char    *lpc;
                char    *hpc;
                int     ncnt;
};


#define HISTFRACTION 2
#define HISTCOUNTER unsigned short
#define HASHFRACTION 1
#define ARCDENSITY 2
#define MINARCS 50
#define BASEADDRESS 0x8000000 /* On Solaris 2 X86 all executables start here
         and not at 0 */ 

struct tostruct {
  char *selfpc;
  long count;
  unsigned short link;
};
struct rawarc {
    unsigned long       raw_frompc;
    unsigned long       raw_selfpc;
    long                raw_count;
};
#define ROUNDDOWN(x,y)  (((x)/(y))*(y))
#define ROUNDUP(x,y)    ((((x)+(y)-1)/(y))*(y))
#endif

/* char *minbrk; */

#ifdef __alpha
extern char *sbrk ();
#endif

    /*
     *  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;

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;
    }
    froms = (unsigned short *) sbrk( s_textsize / HASHFRACTION );
    if ( froms == (unsigned short *) -1 ) {
  write( 2 , MSG , sizeof(MSG) );
  froms = 0;
  return;
    }
    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;
    }
/*    minbrk = (char *) sbrk(0);*/
    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 )
#ifndef hp300
  s_scale = ( (float) monsize / o ) * SCALE_1_TO_1;
#else /* avoid floating point */
    {
  int quot = o / monsize;

  if (quot >= 0x10000)
    s_scale = 1;
  else if (quot >= 0x100)
    s_scale = 0x10000 / quot;
  else if (o >= 0x800000)
    s_scale = 0x1000000 / (o / (monsize >> 8));
  else
    s_scale = 0x1000000 / ((o << 8) / monsize);
    }
#endif
    else
  s_scale = SCALE_1_TO_1;
    moncontrol(1);
}

_mcleanup()
{
    int     fd;
    int     fromindex;
    int     endfrom;
    char    *frompc;
    int     toindex;
    struct rawarc rawarc;

    moncontrol(0);
    fd = creat( "gmon.out" , 0666 );
    if ( fd < 0 ) {
  perror( "mcount: gmon.out" );
  return;
    }
#   ifdef DEBUG
  fprintf( stderr , "[mcleanup] sbuf 0x%x ssiz %d\n" , sbuf , ssiz );
#   endif DEBUG

    write( fd , 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) {
#     ifdef DEBUG
    fprintf( stderr ,
      "[mcleanup] frompc 0x%x selfpc 0x%x count %d\n" ,
      frompc , tos[toindex].selfpc , tos[toindex].count );
#     endif DEBUG
      rawarc.raw_frompc = (unsigned long) frompc;
      rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;
      rawarc.raw_count = tos[toindex].count;
      write( fd , &rawarc , sizeof rawarc );
  }
    }
    close( fd );
}

/* Solaris 2 libraries use _mcount.  */
asm(".globl _mcount; _mcount: jmp internal_mcount");
/* This is for compatibility with old versions of gcc which used mcount.  */
asm(".globl mcount; mcount: jmp internal_mcount");

internal_mcount()
{
  register char     *selfpc;
  register unsigned short   *frompcindex;
  register struct tostruct  *top;
  register struct tostruct  *prevtop;
  register long     toindex;
  static char already_setup;

  /*
   *  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();
    already_setup = 1;
/*    monstartup(0, etext); */
    monstartup(0x08040000, etext);
#ifdef USE_ONEXIT
    on_exit(_mcleanup, 0);
#else
    atexit(_mcleanup);
#endif
  }
  /*
   *  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;
    }
}

---