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/* Native-dependent code for NetBSD/powerpc.

   Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008

   Free Software Foundation, Inc.

   Contributed by Wasabi Systems, 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 <sys/types.h>

#include <sys/ptrace.h>

#include <machine/reg.h>

#include <machine/frame.h>

#include <machine/pcb.h>

#include "defs.h"

#include "gdbcore.h"

#include "inferior.h"

#include "regcache.h"

#include "gdb_assert.h"

#include "ppc-tdep.h"

#include "ppcnbsd-tdep.h"

#include "bsd-kvm.h"

#include "inf-ptrace.h"

/* Returns true if PT_GETREGS fetches this register.  */

static int

getregs_supplies (struct gdbarch *gdbarch, int regnum)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  return ((regnum >= tdep->ppc_gp0_regnum

           && regnum < tdep->ppc_gp0_regnum + ppc_num_gprs)

          || regnum == tdep->ppc_lr_regnum

          || regnum == tdep->ppc_cr_regnum

          || regnum == tdep->ppc_xer_regnum

          || regnum == tdep->ppc_ctr_regnum

          || regnum == gdbarch_pc_regnum (gdbarch));

}

/* Like above, but for PT_GETFPREGS.  */

static int

getfpregs_supplies (struct gdbarch *gdbarch, int regnum)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating

     point registers.  Traditionally, GDB's register set has still

     listed the floating point registers for such machines, so this

     code is harmless.  However, the new E500 port actually omits the

     floating point registers entirely from the register set --- they

     don't even have register numbers assigned to them.

     It's not clear to me how best to update this code, so this assert

     will alert the first person to encounter the NetBSD/E500

     combination to the problem.  */

  gdb_assert (ppc_floating_point_unit_p (gdbarch));

  return ((regnum >= tdep->ppc_fp0_regnum

           && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)

          || regnum == tdep->ppc_fpscr_regnum);

}

static void

ppcnbsd_fetch_inferior_registers (struct regcache *regcache, int regnum)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regnum == -1 || getregs_supplies (gdbarch, regnum))

    {

      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

      ppc_supply_gregset (&ppcnbsd_gregset, regcache,

                          regnum, &regs, sizeof regs);

    }

  if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

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

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

      ppc_supply_fpregset (&ppcnbsd_fpregset, regcache,

                           regnum, &fpregs, sizeof fpregs);

    }

}

static void

ppcnbsd_store_inferior_registers (struct regcache *regcache, int regnum)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regnum == -1 || getregs_supplies (gdbarch, regnum))

    {

      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

      ppc_collect_gregset (&ppcnbsd_gregset, regcache,

                           regnum, &regs, sizeof regs);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),

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

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

    }

  if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

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

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

      ppc_collect_fpregset (&ppcnbsd_fpregset, regcache,

                            regnum, &fpregs, sizeof fpregs);

      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),

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

        perror_with_name (_("Couldn't set FP registers"));

    }

}

static int

ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)

{

  struct switchframe sf;

  struct callframe cf;

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  int i;

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

  if (pcb->pcb_sp == 0)

    return 0;

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

  regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);

  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);

  for (i = 0 ; i < 19 ; i++)

    regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 13 + i,

                         &sf.fixreg[i]);

  read_memory(sf.sp, (gdb_byte *)&cf, sizeof(cf));

  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);

  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);

  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 1, &cf.sp);

  read_memory(cf.sp, (gdb_byte *)&cf, sizeof(cf));

  regcache_raw_supply (regcache, tdep->ppc_lr_regnum, &cf.lr);

  regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &cf.lr);

  return 1;

}

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

void _initialize_ppcnbsd_nat (void);

void

_initialize_ppcnbsd_nat (void)

{

  struct target_ops *t;

  /* Support debugging kernel virtual memory images.  */

  bsd_kvm_add_target (ppcnbsd_supply_pcb);

  /* Add in local overrides.  */

  t = inf_ptrace_target ();

  t->to_fetch_registers = ppcnbsd_fetch_inferior_registers;

  t->to_store_registers = ppcnbsd_store_inferior_registers;

  add_target (t);

}