1  /*
       2   * Copyright (c) 1983, 1993, 1998
       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 Sym indirect_child;
      38  
      39  void mips_find_call (Sym *, bfd_vma, bfd_vma);
      40  
      41  void
      42  mips_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
      43  {
      44    bfd_vma pc, dest_pc;
      45    unsigned int op;
      46    int offset;
      47    Sym *child;
      48    static bool inited = false;
      49  
      50    if (!inited)
      51      {
      52        inited = true;
      53        sym_init (&indirect_child);
      54        indirect_child.name = _("<indirect child>");
      55        indirect_child.cg.prop.fract = 1.0;
      56        indirect_child.cg.cyc.head = &indirect_child;
      57      }
      58  
      59    DBG (CALLDEBUG, printf (_("[find_call] %s: 0x%lx to 0x%lx\n"),
      60  			  parent->name, (unsigned long) p_lowpc,
      61  			  (unsigned long) p_highpc));
      62    for (pc = p_lowpc; pc < p_highpc; pc += 4)
      63      {
      64        op = bfd_get_32 (core_bfd, ((unsigned char *)core_text_space
      65                                   + pc - core_text_sect->vma));
      66        if ((op & 0xfc000000) == 0x0c000000)
      67  	{
      68  	  /* This is a "jal" instruction.  Check that the destination
      69  	     is the address of a function.  */
      70  	  DBG (CALLDEBUG,
      71  	       printf (_("[find_call] 0x%lx: jal"), (unsigned long) pc));
      72            offset = (op & 0x03ffffff) << 2;
      73  	  dest_pc = (pc & ~(bfd_vma) 0xfffffff) | offset;
      74  	  if (hist_check_address (dest_pc))
      75  	    {
      76  	      child = sym_lookup (&symtab, dest_pc);
      77                if (child)
      78  		{
      79  	          DBG (CALLDEBUG,
      80  		       printf (" 0x%lx\t; name=%s, addr=0x%lx",
      81  			       (unsigned long) dest_pc, child->name,
      82  			       (unsigned long) child->addr));
      83  	          if (child->addr == dest_pc)
      84  		    {
      85  		      DBG (CALLDEBUG, printf ("\n"));
      86  		      /* a hit:  */
      87  		      arc_add (parent, child, (unsigned long) 0);
      88  		      continue;
      89  		    }
      90  		}
      91  	    }
      92  	  /* Something funny going on.  */
      93  	  DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
      94  	}
      95        else if ((op & 0xfc00f83f) == 0x0000f809)
      96  	{
      97  	  /* This is a "jalr" instruction (indirect call).  */
      98  	  DBG (CALLDEBUG,
      99  	       printf (_("[find_call] 0x%lx: jalr\n"), (unsigned long) pc));
     100  	  arc_add (parent, &indirect_child, (unsigned long) 0);
     101  	}
     102      }
     103  }