mips.c

/*
 * Copyright (c) 1983, 1993, 1998
 *      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 Sym indirect_child;

void mips_find_call (Sym *, bfd_vma, bfd_vma);

void
mips_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
{
  bfd_vma pc, dest_pc;
  unsigned int op;
  int offset;
  Sym *child;
  static bool inited = false;
  Sym_Table *symtab = get_symtab ();

  if (!inited)
    {
      inited = true;
      sym_init (&indirect_child);
      indirect_child.name = _("<indirect child>");
      indirect_child.cg.prop.fract = 1.0;
      indirect_child.cg.cyc.head = &indirect_child;
    }

  DBG (CALLDEBUG, printf (_("[find_call] %s: 0x%lx to 0x%lx\n"),
			  parent->name, (unsigned long) p_lowpc,
			  (unsigned long) p_highpc));
  p_lowpc = (p_lowpc + 3) & ~3;
  p_highpc &= ~3;
  for (pc = p_lowpc; pc < p_highpc; pc += 4)
    {
      op = bfd_get_32 (core_bfd, ((unsigned char *)core_text_space
                                 + pc - core_text_sect->vma));
      if ((op & 0xfc000000) == 0x0c000000)
	{
	  /* This is a "jal" instruction.  Check that the destination
	     is the address of a function.  */
	  DBG (CALLDEBUG,
	       printf (_("[find_call] 0x%lx: jal"), (unsigned long) pc));
          offset = (op & 0x03ffffff) << 2;
	  dest_pc = (pc & ~(bfd_vma) 0xfffffff) | offset;
	  if (hist_check_address (dest_pc))
	    {
	      child = sym_lookup (symtab, dest_pc);
              if (child)
		{
	          DBG (CALLDEBUG,
		       printf (" 0x%lx\t; name=%s, addr=0x%lx",
			       (unsigned long) dest_pc, child->name,
			       (unsigned long) child->addr));
	          if (child->addr == dest_pc)
		    {
		      DBG (CALLDEBUG, printf ("\n"));
		      /* a hit:  */
		      arc_add (parent, child, (unsigned long) 0);
		      continue;
		    }
		}
	    }
	  /* Something funny going on.  */
	  DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
	}
      else if ((op & 0xfc00f83f) == 0x0000f809)
	{
	  /* This is a "jalr" instruction (indirect call).  */
	  DBG (CALLDEBUG,
	       printf (_("[find_call] 0x%lx: jalr\n"), (unsigned long) pc));
	  arc_add (parent, &indirect_child, (unsigned long) 0);
	}
    }
}