Subversion Repositories openrisc_2011-10-31

/*

 * Copyright (c) 1983, 1993, 2001

 *      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. 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.

 */

#include "gprof.h"

#include "search_list.h"

#include "source.h"

#include "symtab.h"

#include "cg_arcs.h"

#include "corefile.h"

#include "hist.h"

static int i386_iscall (unsigned char *);

void i386_find_call (Sym *, bfd_vma, bfd_vma);

static int

i386_iscall (unsigned char *ip)

{

  if (*ip == 0xe8)

    return 1;

  return 0;

}

void

i386_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)

{

  unsigned char *instructp;

  Sym *child;

  bfd_vma pc, destpc;

  DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",

                          parent->name, (unsigned long) p_lowpc,

                          (unsigned long) p_highpc));

  for (pc = p_lowpc; pc < p_highpc; ++pc)

    {

      instructp = (unsigned char *) core_text_space + pc - core_text_sect->vma;

      if (i386_iscall (instructp))

        {

          DBG (CALLDEBUG,

               printf ("[findcall]\t0x%lx:call", (unsigned long) pc));

          /*

           *  regular pc relative addressing

           *    check that this is the address of

           *    a function.

           */

          destpc = bfd_get_32 (core_bfd, instructp + 1) + pc + 5;

          if (hist_check_address (destpc))

            {

              child = sym_lookup (&symtab, destpc);

              if (child && child->addr == destpc)

                {

                  /*

                   *      a hit

                   */

                  DBG (CALLDEBUG,

                       printf ("\tdestpc 0x%lx (%s)\n",

                               (unsigned long) destpc, child->name));

                  arc_add (parent, child, (unsigned long) 0);

                  instructp += 4;       /* call is a 5 byte instruction */

                  continue;

                }

            }

          /*

           *  else:

           *    it looked like a callf, but it:

           *      a) wasn't actually a callf, or

           *      b) didn't point to a known function in the symtab, or

           *      c) something funny is going on.

           */

          DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));

        }

    }

}