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/* Native-dependent code for modern VAX BSD's.

   Copyright (C) 2004, 2005, 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 "target.h"

#include <sys/types.h>

#include <sys/ptrace.h>

#include <machine/reg.h>

#include "vax-tdep.h"

#include "inf-ptrace.h"

/* Supply the general-purpose registers stored in GREGS to REGCACHE.  */

static void

vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)

{

  const gdb_byte *regs = gregs;

  int regnum;

  for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)

    regcache_raw_supply (regcache, regnum, regs + regnum * 4);

}

/* Collect the general-purpose registers from REGCACHE and store them

   in GREGS.  */

static void

vaxbsd_collect_gregset (const struct regcache *regcache,

                        void *gregs, int regnum)

{

  gdb_byte *regs = gregs;

  int i;

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

    {

      if (regnum == -1 || regnum == i)

        regcache_raw_collect (regcache, i, regs + i * 4);

    }

}

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

   for all registers.  */

static void

vaxbsd_fetch_inferior_registers (struct target_ops *ops,

                                 struct regcache *regcache, int regnum)

{

  struct reg regs;

  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

  vaxbsd_supply_gregset (regcache, &regs);

}

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

   this for all registers.  */

static void

vaxbsd_store_inferior_registers (struct target_ops *ops,

                                 struct regcache *regcache, int regnum)

{

  struct reg regs;

  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

  vaxbsd_collect_gregset (regcache, &regs, regnum);

  if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),

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

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

}

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

#include <sys/types.h>

#include <machine/pcb.h>

#include "bsd-kvm.h"

static int

vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)

{

  int regnum;

  /* The following is true for OpenBSD 3.5:

     The pcb contains the register state at the context switch inside

     cpu_switch().  */

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

  if (pcb->KSP == 0)

    return 0;

  for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)

    regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);

  regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);

  regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);

  regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);

  regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);

  regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);

  return 1;

}

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

void _initialize_vaxbsd_nat (void);

void

_initialize_vaxbsd_nat (void)

{

  struct target_ops *t;

  t = inf_ptrace_target ();

  t->to_fetch_registers = vaxbsd_fetch_inferior_registers;

  t->to_store_registers = vaxbsd_store_inferior_registers;

  add_target (t);

  /* Support debugging kernel virtual memory images.  */

  bsd_kvm_add_target (vaxbsd_supply_pcb);

}