Subversion Repositories openrisc_2011-10-31

/*

 * 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"

/*

 * Opcodes of the call instructions:

 */

#define OP_Jxx  0x1a

#define OP_BSR  0x34

#define Jxx_FUNC_JMP            0

#define Jxx_FUNC_JSR            1

#define Jxx_FUNC_RET            2

#define Jxx_FUNC_JSR_COROUTINE  3

/* *INDENT-OFF* */

/* Here to document only.  We can't use this when cross compiling as

   the bitfield layout might not be the same as native.

   typedef union

     {

       struct

         {

           unsigned other:26;

           unsigned op_code:6;

         }

       a;                               -- any format

       struct

         {

           int disp:21;

           unsigned ra:5;

           unsigned op_code:6;

         }

       b;                               -- branch format

       struct

         {

           int hint:14;

           unsigned func:2;

           unsigned rb:5;

           unsigned ra:5;

           unsigned op_code:6;

         }

       j;                               -- jump format

     }

    alpha_Instruction;

*/

/* *INDENT-ON* */

static Sym indirect_child;

void alpha_find_call (Sym *, bfd_vma, bfd_vma);

/*

 * On the Alpha we can only detect PC relative calls, which are

 * usually generated for calls to functions within the same

 * object file only.  This is still better than nothing, however.

 * (In particular it should be possible to find functions that

 *  potentially call integer division routines, for example.)

 */

void

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

{

  bfd_vma pc, dest_pc;

  unsigned int insn;

  Sym *child;

  if (indirect_child.name == NULL)

    {

      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));

  for (pc = (p_lowpc + 3) & ~(bfd_vma) 3; pc < p_highpc; pc += 4)

    {

      insn = bfd_get_32 (core_bfd, ((unsigned char *) core_text_space

                                    + pc - core_text_sect->vma));

      switch (insn & (0x3f << 26))

        {

        case OP_Jxx << 26:

          /*

           * There is no simple and reliable way to determine the

           * target of a jsr (the hint bits help, but there aren't

           * enough bits to get a satisfactory hit rate).  Instead,

           * for any indirect jump we simply add an arc from PARENT

           * to INDIRECT_CHILD---that way the user it at least able

           * to see that there are other calls as well.

           */

          if ((insn & (3 << 14)) == Jxx_FUNC_JSR << 14

              || (insn & (3 << 14)) == Jxx_FUNC_JSR_COROUTINE << 14)

            {

              DBG (CALLDEBUG,

                   printf (_("[find_call] 0x%lx: jsr%s <indirect_child>\n"),

                           (unsigned long) pc,

                           ((insn & (3 << 14)) == Jxx_FUNC_JSR << 14

                            ? "" : "_coroutine")));

              arc_add (parent, &indirect_child, (unsigned long) 0);

            }

          break;

        case OP_BSR << 26:

          DBG (CALLDEBUG,

               printf (_("[find_call] 0x%lx: bsr"), (unsigned long) pc));

          /*

           * Regular PC relative addressing.  Check that this is the

           * address of a function.  The linker sometimes redirects

           * the entry point by 8 bytes to skip loading the global

           * pointer, so we allow for either address:

           */

          dest_pc = pc + 4 + (((bfd_signed_vma) (insn & 0x1fffff)

                               ^ 0x100000) - 0x100000);

          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 || child->addr == dest_pc - 8)

                    {

                      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"));

          break;

        default:

          break;

        }

    }

}