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/* Native-dependent code for GNU/Linux m32r.

   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   This file is part of GDB.

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

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program 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 a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "inferior.h"

#include "gdbcore.h"

#include "regcache.h"

#include "linux-nat.h"

#include "target.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include <sys/ptrace.h>

#include <sys/user.h>

#include <sys/procfs.h>

/* Prototypes for supply_gregset etc.  */

#include "gregset.h"

#include "m32r-tdep.h"

/* Since EVB register is not available for native debug, we reduce

   the number of registers.  */

#define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)

/* Mapping between the general-purpose registers in `struct user'

   format and GDB's register array layout.  */

static int regmap[] = {

  4, 5, 6, 7, 0, 1, 2, 8,

  9, 10, 11, 12, 13, 24, 25, 23,

  19, 19, 26, 23, 22, 20, 16, 15

};

#define PSW_REGMAP 19

#define BBPSW_REGMAP 21

#define SPU_REGMAP 23

#define SPI_REGMAP 26

/* Doee apply to the corresponding SET requests as well.  */

#define GETREGS_SUPPLIES(regno) (0 <= (regno) && (regno) <= M32R_LINUX_NUM_REGS)

/* Transfering the general-purpose registers between GDB, inferiors

   and core files.  */

/* Fill GDB's register array with the general-purpose register values

   in *GREGSETP.  */

void

supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp)

{

  const elf_greg_t *regp = (const elf_greg_t *) gregsetp;

  int i;

  unsigned long psw, bbpsw;

  psw = *(regp + PSW_REGMAP);

  bbpsw = *(regp + BBPSW_REGMAP);

  for (i = 0; i < M32R_LINUX_NUM_REGS; i++)

    {

      elf_greg_t regval;

      switch (i)

        {

        case PSW_REGNUM:

          regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);

          break;

        case CBR_REGNUM:

          regval = ((psw >> 8) & 1);

          break;

        default:

          regval = *(regp + regmap[i]);

          break;

        }

      if (i != M32R_SP_REGNUM)

        regcache_raw_supply (regcache, i, &regval);

      else if (psw & 0x8000)

        regcache_raw_supply (regcache, i, regp + SPU_REGMAP);

      else

        regcache_raw_supply (regcache, i, regp + SPI_REGMAP);

    }

}

/* Fetch all general-purpose registers from process/thread TID and

   store their values in GDB's register array.  */

static void

fetch_regs (struct regcache *regcache, int tid)

{

  elf_gregset_t regs;

  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)

    perror_with_name (_("Couldn't get registers"));

  supply_gregset (regcache, (const elf_gregset_t *) &regs);

}

/* Fill register REGNO (if it is a general-purpose register) in

   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,

   do this for all registers.  */

void

fill_gregset (const struct regcache *regcache,

              elf_gregset_t * gregsetp, int regno)

{

  elf_greg_t *regp = (elf_greg_t *) gregsetp;

  int i;

  unsigned long psw, bbpsw, tmp;

  psw = *(regp + PSW_REGMAP);

  bbpsw = *(regp + BBPSW_REGMAP);

  for (i = 0; i < M32R_LINUX_NUM_REGS; i++)

    {

      if (regno != -1 && regno != i)

        continue;

      if (i == CBR_REGNUM || i == PSW_REGNUM)

        continue;

      if (i == SPU_REGNUM || i == SPI_REGNUM)

        continue;

      if (i != M32R_SP_REGNUM)

        regcache_raw_collect (regcache, i, regp + regmap[i]);

      else if (psw & 0x8000)

        regcache_raw_collect (regcache, i, regp + SPU_REGMAP);

      else

        regcache_raw_collect (regcache, i, regp + SPI_REGMAP);

    }

}

/* Store all valid general-purpose registers in GDB's register array

   into the process/thread specified by TID.  */

static void

store_regs (const struct regcache *regcache, int tid, int regno)

{

  elf_gregset_t regs;

  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)

    perror_with_name (_("Couldn't get registers"));

  fill_gregset (regcache, &regs, regno);

  if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)

    perror_with_name (_("Couldn't write registers"));

}

/* Transfering floating-point registers between GDB, inferiors and cores.

   Since M32R has no floating-point registers, these functions do nothing.  */

void

supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)

{

}

void

fill_fpregset (const struct regcache *regcache,

               gdb_fpregset_t *fpregs, int regno)

{

}

/* Transferring arbitrary registers between GDB and inferior.  */

/* Fetch register REGNO from the child process.  If REGNO is -1, do

   this for all registers (including the floating point and SSE

   registers).  */

static void

m32r_linux_fetch_inferior_registers (struct target_ops *ops,

                                     struct regcache *regcache, int regno)

{

  int tid;

  /* GNU/Linux LWP ID's are process ID's.  */

  tid = TIDGET (inferior_ptid);

  if (tid == 0)

    tid = PIDGET (inferior_ptid);       /* Not a threaded program.  */

  /* Use the PTRACE_GETREGS request whenever possible, since it

     transfers more registers in one system call, and we'll cache the

     results.  */

  if (regno == -1 || GETREGS_SUPPLIES (regno))

    {

      fetch_regs (regcache, tid);

      return;

    }

  internal_error (__FILE__, __LINE__,

                  _("Got request for bad register number %d."), regno);

}

/* Store register REGNO back into the child process.  If REGNO is -1,

   do this for all registers (including the floating point and SSE

   registers).  */

static void

m32r_linux_store_inferior_registers (struct target_ops *ops,

                                     struct regcache *regcache, int regno)

{

  int tid;

  /* GNU/Linux LWP ID's are process ID's.  */

  if ((tid = TIDGET (inferior_ptid)) == 0)

    tid = PIDGET (inferior_ptid);       /* Not a threaded program.  */

  /* Use the PTRACE_SETREGS request whenever possible, since it

     transfers more registers in one system call.  */

  if (regno == -1 || GETREGS_SUPPLIES (regno))

    {

      store_regs (regcache, tid, regno);

      return;

    }

  internal_error (__FILE__, __LINE__,

                  _("Got request to store bad register number %d."), regno);

}

void _initialize_m32r_linux_nat (void);

void

_initialize_m32r_linux_nat (void)

{

  struct target_ops *t;

  /* Fill in the generic GNU/Linux methods.  */

  t = linux_target ();

  /* Add our register access methods.  */

  t->to_fetch_registers = m32r_linux_fetch_inferior_registers;

  t->to_store_registers = m32r_linux_store_inferior_registers;

  /* Register the target.  */

  linux_nat_add_target (t);

}