gprof/aarch64.c

/* Gprof -c option support for AArch64.
   Copyright 2013 Linaro Ltd.

   Based upon gprof/i386.c.

   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"

#define BRANCH_MASK    0x7c000000
#define BRANCH_PATTERN 0x14000000

void aarch64_find_call (Sym *, bfd_vma, bfd_vma);

void
aarch64_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
{
  bfd_vma pc, dest_pc, offset;
  unsigned int insn;
  Sym *child;

  DBG (CALLDEBUG, printf ("[find_call] %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 += 4)
    {

      insn = bfd_get_32 (core_bfd, ((unsigned char *) core_text_space
				    + pc - core_text_sect->vma));

      if ((insn & BRANCH_MASK) == BRANCH_PATTERN)
	{
	  DBG (CALLDEBUG,
	       printf ("[find_call] 0x%lx: bl", (unsigned long) pc));

	  /* Regular pc relative addressing check that this is the
	     address of a function.  */
	  offset = ((((bfd_vma) insn & 0x3ffffff) ^ 0x2000000) - 0x2000000) << 2;

	  dest_pc = pc + offset;

	  if (hist_check_address (dest_pc))
	    {
	      child = sym_lookup (&symtab, dest_pc);

	      if (child)
		{
		  DBG (CALLDEBUG,
		       printf ("\tdest_pc=0x%lx, (name=%s, addr=0x%lx)\n",
			       (unsigned long) dest_pc, child->name,
			       (unsigned long) child->addr));

		  if (child->addr == dest_pc)
		    {
		      /* a hit.  */
		      arc_add (parent, child, (unsigned long) 0);
		      continue;
		    }
		}
	    }

	  /* Something funny going on.  */
	  DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
	}
    }
}