/* Fetch live process registers from TID.

   Copyright (C) 2013 Red Hat, Inc.

   This file is part of elfutils.

   This file is free software; you can redistribute it and/or modify

   it under the terms of either

     * the GNU Lesser General Public License as published by the Free

       Software Foundation; either version 3 of the License, or (at

       your option) any later version

   or

     * the GNU General Public License as published by the Free

       Software Foundation; either version 2 of the License, or (at

       your option) any later version

   or both in parallel, as here.

   elfutils is distributed in the hope that it will be useful, but

   WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   General Public License for more details.

   You should have received copies of the GNU General Public License and

   the GNU Lesser General Public License along with this program.  If

   not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <stdlib.h>

#if defined(__powerpc__) && defined(__linux__)

# include <sys/ptrace.h>

# include <sys/user.h>

#endif

#include "system.h"

#define BACKEND ppc_

#include "libebl_CPU.h"

bool

ppc_dwarf_to_regno (Ebl *ebl __attribute__ ((unused)), unsigned *regno)

{

  switch (*regno)

  {

    case 108:

      // LR uses both 65 and 108 numbers, there is no consistency for it.

      *regno = 65;

      return true;

    case 0 ... 107:

    case 109 ... (114 - 1) -1:

      return true;

    case 1200 ... 1231:

      *regno = *regno - 1200 + (114 - 1);

      return true;

    default:

      return false;

  }

  abort ();

}

__typeof (ppc_dwarf_to_regno)

     ppc64_dwarf_to_regno

     __attribute__ ((alias ("ppc_dwarf_to_regno")));

bool

ppc_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),

			  ebl_tid_registers_t *setfunc __attribute__ ((unused)),

			       void *arg __attribute__ ((unused)))

{

#if !defined(__powerpc__) || !defined(__linux__)

  return false;

#else /* __powerpc__ */

  union

    {

      struct pt_regs r;

      long l[sizeof (struct pt_regs) / sizeof (long)];

    }

  user_regs;

  eu_static_assert (sizeof (struct pt_regs) % sizeof (long) == 0);

  /* PTRACE_GETREGS is EIO on kernel-2.6.18-308.el5.ppc64.  */

  errno = 0;

  for (unsigned regno = 0; regno < sizeof (user_regs) / sizeof (long);

       regno++)

    {

      user_regs.l[regno] = ptrace (PTRACE_PEEKUSER, tid,

				   (void *) (uintptr_t) (regno

							 * sizeof (long)),

				   NULL);

      if (errno != 0)

	return false;

    }

#define GPRS (sizeof (user_regs.r.gpr) / sizeof (*user_regs.r.gpr))

  Dwarf_Word dwarf_regs[GPRS];

  for (unsigned gpr = 0; gpr < GPRS; gpr++)

    dwarf_regs[gpr] = user_regs.r.gpr[gpr];

  if (! setfunc (0, GPRS, dwarf_regs, arg))

    return false;

  dwarf_regs[0] = user_regs.r.link;

  // LR uses both 65 and 108 numbers, there is no consistency for it.

  if (! setfunc (65, 1, dwarf_regs, arg))

    return false;

  /* Registers like msr, ctr, xer, dar, dsisr etc. are probably irrelevant

     for CFI.  */

  dwarf_regs[0] = user_regs.r.nip;

  return setfunc (-1, 1, dwarf_regs, arg);

#endif /* __powerpc__ */

}

__typeof (ppc_set_initial_registers_tid)

     ppc64_set_initial_registers_tid

     __attribute__ ((alias ("ppc_set_initial_registers_tid")));