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

   Copyright (C) 2000-2018 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 "alpha-bsd-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"

struct alpha_bsd_nat_target final : public inf_ptrace_target

{

  void fetch_registers (struct regcache *, int) override;

  void store_registers (struct regcache *, int) override;

};

static alpha_bsd_nat_target the_alpha_bsd_nat_target;

/* 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).  */

void

alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)

{

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

    {

      struct reg gregs;

      if (ptrace (PT_GETREGS, regcache->ptid ().pid (),

		  (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 (regcache->arch ()))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),

		  (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).  */

void

alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)

{

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

    {

      struct reg gregs;

      if (ptrace (PT_GETREGS, regcache->ptid ().pid (),

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

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

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

      if (ptrace (PT_SETREGS, regcache->ptid ().pid (),

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

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

      if (regno != -1)

	return;

    }

  if (regno == -1

      || regno >= gdbarch_fp0_regnum (regcache->arch ()))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),

		  (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, regcache->ptid ().pid (),

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

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

    }

}

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

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

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

    regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);

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

  return 1;

}

void

_initialize_alphabsd_nat (void)

{

  add_inf_child_target (&the_alpha_bsd_nat_target);

  /* Support debugging kernel virtual memory images.  */

  bsd_kvm_add_target (alphabsd_supply_pcb);

}