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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 [rescinded 22 July 1999]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.

 */

#include "tconfig.h"

#include "tsystem.h"

#include <fcntl.h> /* for creat() */

#ifdef DEBUG

#include <stdio.h>

#endif

static void moncontrol (int);

extern void monstartup (char *, char *);

extern void _mcleanup (void);

extern void internal_mcount (

#ifdef __x86_64__

                             char *, unsigned short *

#else

                             void

#endif

                             );

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))

/* char *minbrk; */

typedef __SIZE_TYPE__ size_t;

typedef __PTRDIFF_TYPE__ intptr_t;

    /*

     *  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 size_t           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;

extern void *sbrk (intptr_t);

void

monstartup(char *lowpc, char *highpc)

{

    size_t              monsize;

    char                *buffer;

    register size_t     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((size_t)lowpc, HISTFRACTION*sizeof(HISTCOUNTER));

    s_lowpc = lowpc;

    highpc = (char *)

            ROUNDUP((size_t)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);

}

void

_mcleanup (void)

{

    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 );

}

#ifdef __x86_64__

/* See GLIBC for additional information about this technique.  */

asm(".globl _mcount\n"

    "\t.type\t_mcount, @function\n"

    "_mcount:\n"

    /* The compiler calls _mcount after the prologue, and does not

       save any of the registers.  Therefore we must preserve all

       seven registers which may contain function arguments.  */

    "\tsubq\t$0x38,%rsp\n"

    "\tmovq\t%rax,(%rsp)\n"

    "\tmovq\t%rcx,0x08(%rsp)\n"

    "\tmovq\t%rdx,0x10(%rsp)\n"

    "\tmovq\t%rsi,0x18(%rsp)\n"

    "\tmovq\t%rdi,0x20(%rsp)\n"

    "\tmovq\t%r8,0x28(%rsp)\n"

    "\tmovq\t%r9,0x30(%rsp)\n"

    /* Get SELFPC (pushed by the call to this function) and

       FROMPCINDEX (via the frame pointer.  */

    "\tmovq\t0x38(%rsp),%rdi\n"

    "\tmovq\t0x8(%rbp),%rsi\n"

    "\tcall\tinternal_mcount\n"

    /* Restore the saved registers.  */

    "\tmovq\t0x30(%rsp),%r9\n"

    "\tmovq\t0x28(%rsp),%r8\n"

    "\tmovq\t0x20(%rsp),%rdi\n"

    "\tmovq\t0x18(%rsp),%rsi\n"

    "\tmovq\t0x10(%rsp),%rdx\n"

    "\tmovq\t0x08(%rsp),%rcx\n"

    "\tmovq\t(%rsp),%rax\n"

    "\taddq\t$0x38,%rsp\n"

    "\tretq\n"

    );

#else

/* 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");

#endif

void

internal_mcount (

#ifdef __x86_64__

                 char *selfpc,

                 unsigned short *frompcindex

#else

                 void

#endif

                 )

{

#ifndef __x86_64__

        register char                   *selfpc;

        register unsigned short         *frompcindex;

#endif

        register struct tostruct        *top;

        register struct tostruct        *prevtop;

        register long                   toindex;

        static char already_setup;

#ifndef __x86_64__

        /*

         *      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);

#endif

        if(!already_setup) {

          extern char etext[];

          already_setup = 1;

#ifdef __x86_64__

          monstartup(0, etext);

#else

          monstartup((char*)0x08040000, etext);

#endif

#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.

 */

static void

moncontrol(int mode)

{

    if (mode)

    {

      /* start */

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

             ssiz - sizeof(struct phdr),

             (size_t)s_lowpc, s_scale);

      profiling = 0;

    } else {

      /* stop */

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

      profiling = 3;

    }

}