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/* Native-dependent code for UltraSPARC systems running NetBSD.

   Copyright 2002 Free Software Foundation, Inc.

   Contributed by Wasabi Systems, 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "inferior.h"

#include "regcache.h"

#include "sparcnbsd-tdep.h"

#include <sys/types.h>

#include <sys/ptrace.h>

#include <machine/reg.h>

/* NOTE: We don't bother with any of the deferred_store nonsense; it

   makes things a lot more complicated than they need to be.  */

/* Determine if PT_GETREGS fetches this register.  */

static int

getregs_supplies (int regno)

{

  /* FIXME: PS_REGNUM for 32-bit code.  */

  return (regno == TSTATE_REGNUM

          || regno == PC_REGNUM

          || regno == NPC_REGNUM

          || regno == Y_REGNUM

          || (regno >= G0_REGNUM && regno <= G7_REGNUM)

          || (regno >= O0_REGNUM && regno <= O7_REGNUM)

          /* stack regs (handled by sparcnbsd_supply_reg)  */

          || (regno >= L0_REGNUM && regno <= I7_REGNUM));

}

/* Determine if PT_GETFPREGS fetches this register.  */

static int

getfpregs_supplies (int regno)

{

  return ((regno >= FP0_REGNUM && regno <= (FP0_REGNUM + 47))

          || regno == FPS_REGNUM);

}

void

fetch_inferior_registers (int regno)

{

  /* We don't use deferred stores.  */

  if (deferred_stores)

    internal_error (__FILE__, __LINE__,

                    "fetch_inferior_registers: deferred stores pending");

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

    {

      union {

        struct reg32 regs32;

        struct reg64 regs64;

      } regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &regs, 0) == -1)

        perror_with_name ("Couldn't get registers");

      if (gdbarch_ptr_bit (current_gdbarch) == 32)

        sparcnbsd_supply_reg32 ((char *) &regs.regs32, regno);

      else

        sparcnbsd_supply_reg64 ((char *) &regs.regs64, regno);

      if (regno != -1)

        return;

    }

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

    {

      union {

        struct fpreg32 fpregs32;

        struct fpreg64 fpregs64;

      } fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)

        perror_with_name ("Couldn't get floating point registers");

      if (gdbarch_ptr_bit (current_gdbarch) == 32)

        sparcnbsd_supply_fpreg32 ((char *) &fpregs.fpregs32, regno);

      else

        sparcnbsd_supply_fpreg64 ((char *) &fpregs.fpregs64, regno);

      if (regno != -1)

        return;

    }

}

void

store_inferior_registers (int regno)

{

  /* We don't use deferred stores.  */

  if (deferred_stores)

    internal_error (__FILE__, __LINE__,

                    "store_inferior_registers: deferred stores pending");

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

    {

      union {

        struct reg32 regs32;

        struct reg64 regs64;

      } regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &regs, 0) == -1)

        perror_with_name ("Couldn't get registers");

      if (gdbarch_ptr_bit (current_gdbarch) == 32)

        sparcnbsd_fill_reg32 ((char *) &regs.regs32, regno);

      else

        sparcnbsd_fill_reg64 ((char *) &regs.regs64, regno);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &regs, 0) == -1)

        perror_with_name ("Couldn't write registers");

      /* Deal with the stack regs.  */

      if (regno == -1 || regno == SP_REGNUM

          || (regno >= L0_REGNUM && regno <= I7_REGNUM))

        {

          CORE_ADDR sp = read_register (SP_REGNUM);

          int i;

          char buf[8];

          if (sp & 1)

            {

              /* Registers are 64-bit.  */

              sp += 2047;

              for (i = L0_REGNUM; i <= I7_REGNUM; i++)

                {

                  if (regno == -1 || regno == SP_REGNUM || regno == i)

                    {

                      regcache_collect (i, buf);

                      target_write_memory (sp + ((i - L0_REGNUM) * 8),

                                           buf, sizeof (buf));

                    }

                }

            }

          else

            {

              /* Registers are 32-bit.  Toss any sign-extension of the stack

                 pointer.

                 FIXME: We don't currently handle 32-bit code in a binary

                 that indicated LP64.  Do we have to care about that?  */

              if (gdbarch_ptr_bit (current_gdbarch) != 32)

                internal_error

                    (__FILE__, __LINE__,

                    "store_inferior_registers: 32-bit code in 64-bit inferior");

              sp &= 0xffffffffUL;

              for (i = L0_REGNUM; i <= I7_REGNUM; i++)

                {

                  if (regno == -1 || regno == SP_REGNUM || regno == i)

                    {

                      regcache_collect (i, buf);

                      target_write_memory (sp + ((i - L0_REGNUM) * 4), buf, 4);

                    }

                }

            }

        }

      if (regno != -1)

        return;

    }

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

    {

      union {

        struct fpreg32 fpregs32;

        struct fpreg64 fpregs64;

      } fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)

        perror_with_name ("Couldn't get floating point registers");

      if (gdbarch_ptr_bit (current_gdbarch) == 32)

        sparcnbsd_fill_fpreg32 ((char *) &fpregs.fpregs32, regno);

      else

        sparcnbsd_fill_fpreg64 ((char *) &fpregs.fpregs64, regno);

      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)

        perror_with_name ("Couldn't write floating point registers");

      if (regno != -1)

        return;

    }

}