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/* Native-dependent code for modern VAX BSD's.
 
   Copyright (C) 2004, 2005, 2007, 2008 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 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 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);
}