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/* Native-dependent code for NetBSD/i386.

   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 "gdbcore.h"

#include "regcache.h"

#include "target.h"

#include "i386-tdep.h"

#include "i386bsd-nat.h"

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

#include <sys/types.h>

#include <machine/frame.h>

#include <machine/pcb.h>

#include "nbsd-nat.h"

#include "bsd-kvm.h"

static int

i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)

{

  struct switchframe sf;

  /* The following is true for NetBSD 1.6.2:

     The pcb contains %esp and %ebp at the point of the context switch

     in cpu_switch().  At that point we have a stack frame as

     described by `struct switchframe', which for NetBSD 1.6.2 has the

     following layout:

     interrupt level

     %edi

     %esi

     %ebx

     %eip

     we reconstruct the register state as it would look when we just

     returned from cpu_switch().  */

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

  if (pcb->pcb_esp == 0)

    return 0;

  read_memory (pcb->pcb_esp, (gdb_byte *)&sf, sizeof sf);

  pcb->pcb_esp += sizeof (struct switchframe);

  regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi);

  regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi);

  regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);

  regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);

  regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx);

  regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip);

  return 1;

}

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

void _initialize_i386nbsd_nat (void);

void

_initialize_i386nbsd_nat (void)

{

  struct target_ops *t;

  /* Add some extra features to the common *BSD/i386 target.  */

  t = i386bsd_target ();

  t->to_pid_to_exec_file = nbsd_pid_to_exec_file;

  add_target (t);

  /* Support debugging kernel virtual memory images.  */

  bsd_kvm_add_target (i386nbsd_supply_pcb);

}