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/* Native-dependent code for Alpha BSD's.

   Copyright (C) 2000, 2001, 2002, 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 "regcache.h"

#include "alpha-tdep.h"

#include "alphabsd-tdep.h"

#include "inf-ptrace.h"

#include <sys/types.h>

#include <sys/ptrace.h>

#include <machine/reg.h>

#ifdef HAVE_SYS_PROCFS_H

#include <sys/procfs.h>

#endif

#ifndef HAVE_GREGSET_T

typedef struct reg gregset_t;

#endif

#ifndef HAVE_FPREGSET_T 

typedef struct fpreg fpregset_t;

#endif 

#include "gregset.h"

/* Provide *regset() wrappers around the generic Alpha BSD register

   supply/fill routines.  */

void

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

{

  alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);

}

void

fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)

{

  alphabsd_fill_reg (regcache, (char *) gregsetp, regno);

}

void

supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)

{

  alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);

}

void

fill_fpregset (const struct regcache *regcache, fpregset_t *fpregsetp, int regno)

{

  alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);

}

/* Determine if PT_GETREGS fetches this register.  */

static int

getregs_supplies (int regno)

{

  return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)

          || regno >= ALPHA_PC_REGNUM);

}

/* Fetch register REGNO from the inferior.  If REGNO is -1, do this

   for all registers (including the floating point registers).  */

static void

alphabsd_fetch_inferior_registers (struct target_ops *ops,

                                   struct regcache *regcache, int regno)

{

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

    {

      struct reg gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)

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

      alphabsd_supply_reg (regcache, (char *) &gregs, regno);

      if (regno != -1)

        return;

    }

  if (regno == -1 || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)

        perror_with_name (_("Couldn't get floating point status"));

      alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);

    }

}

/* Store register REGNO back into the inferior.  If REGNO is -1, do

   this for all registers (including the floating point registers).  */

static void

alphabsd_store_inferior_registers (struct target_ops *ops,

                                   struct regcache *regcache, int regno)

{

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

    {

      struct reg gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)

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

      alphabsd_fill_reg (regcache, (char *) &gregs, regno);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)

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

      if (regno != -1)

        return;

    }

  if (regno == -1 || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)

        perror_with_name (_("Couldn't get floating point status"));

      alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);

      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)

        perror_with_name (_("Couldn't write floating point status"));

    }

}

/* Support for debugging kernel virtual memory images.  */

#include <sys/types.h>

#include <sys/signal.h>

#include <machine/pcb.h>

#include "bsd-kvm.h"

static int

alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)

{

  int regnum;

  /* The following is true for OpenBSD 3.9:

     The pcb contains the register state at the context switch inside

     cpu_switch().  */

  /* The stack pointer shouldn't be zero.  */

  if (pcb->pcb_hw.apcb_ksp == 0)

    return 0;

  regcache_raw_supply (regcache, ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);

  for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)

    regcache_raw_supply (regcache, regnum,

                         &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);

  regcache_raw_supply (regcache, ALPHA_RA_REGNUM, &pcb->pcb_context[7]);

  return 1;

}

/* Provide a prototype to silence -Wmissing-prototypes.  */

void _initialize_alphabsd_nat (void);

void

_initialize_alphabsd_nat (void)

{

  struct target_ops *t;

  t = inf_ptrace_target ();

  t->to_fetch_registers = alphabsd_fetch_inferior_registers;

  t->to_store_registers = alphabsd_store_inferior_registers;

  add_target (t);

  /* Support debugging kernel virtual memory images.  */

  bsd_kvm_add_target (alphabsd_supply_pcb);

}