1  /*
       2   * Copyright (c) 1983, 1993, 2001
       3   *      The Regents of the University of California.  All rights reserved.
       4   *
       5   * Redistribution and use in source and binary forms, with or without
       6   * modification, are permitted provided that the following conditions
       7   * are met:
       8   * 1. Redistributions of source code must retain the above copyright
       9   *    notice, this list of conditions and the following disclaimer.
      10   * 2. Redistributions in binary form must reproduce the above copyright
      11   *    notice, this list of conditions and the following disclaimer in the
      12   *    documentation and/or other materials provided with the distribution.
      13   * 3. Neither the name of the University nor the names of its contributors
      14   *    may be used to endorse or promote products derived from this software
      15   *    without specific prior written permission.
      16   *
      17   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
      18   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      19   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      20   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
      21   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      22   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      23   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      24   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      25   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      26   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      27   * SUCH DAMAGE.
      28   */
      29  #include "gprof.h"
      30  #include "search_list.h"
      31  #include "source.h"
      32  #include "symtab.h"
      33  #include "cg_arcs.h"
      34  #include "corefile.h"
      35  #include "hist.h"
      36  
      37  static int i386_iscall (unsigned char *);
      38  void i386_find_call (Sym *, bfd_vma, bfd_vma);
      39  
      40  static int
      41  i386_iscall (unsigned char *ip)
      42  {
      43    if (*ip == 0xe8)
      44      return 1;
      45    return 0;
      46  }
      47  
      48  
      49  void
      50  i386_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
      51  {
      52    unsigned char *instructp;
      53    Sym *child;
      54    bfd_vma pc, destpc;
      55  
      56    DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
      57  			  parent->name, (unsigned long) p_lowpc,
      58  			  (unsigned long) p_highpc));
      59  
      60    for (pc = p_lowpc; pc < p_highpc; ++pc)
      61      {
      62        instructp = (unsigned char *) core_text_space + pc - core_text_sect->vma;
      63        if (i386_iscall (instructp))
      64  	{
      65  	  DBG (CALLDEBUG,
      66  	       printf ("[findcall]\t0x%lx:call", (unsigned long) pc));
      67  	  /*
      68  	   *  regular pc relative addressing
      69  	   *    check that this is the address of
      70  	   *    a function.
      71  	   */
      72  
      73  	  destpc = bfd_get_32 (core_bfd, instructp + 1) + pc + 5;
      74  	  if (hist_check_address (destpc))
      75  	    {
      76  	      child = sym_lookup (&symtab, destpc);
      77  	      if (child && child->addr == destpc)
      78  		{
      79  		  /*
      80  		   *      a hit
      81  		   */
      82  		  DBG (CALLDEBUG,
      83  		       printf ("\tdestpc 0x%lx (%s)\n",
      84  			       (unsigned long) destpc, child->name));
      85  		  arc_add (parent, child, (unsigned long) 0);
      86  		  instructp += 4;	/* call is a 5 byte instruction */
      87  		  continue;
      88  		}
      89  	    }
      90  	  /*
      91  	   *  else:
      92  	   *    it looked like a callf, but it:
      93  	   *      a) wasn't actually a callf, or
      94  	   *      b) didn't point to a known function in the symtab, or
      95  	   *      c) something funny is going on.
      96  	   */
      97  	  DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
      98  	}
      99      }
     100  }