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/* Native-dependent code for NetBSD/sparc64.

   Copyright (C) 2003, 2004, 2006, 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 "sparc64-tdep.h"

#include "sparc-nat.h"

/* NetBSD is different from the other OSes that support both SPARC and

   UltraSPARC in that the result of ptrace(2) depends on whether the

   traced process is 32-bit or 64-bit.  */

static void

sparc64nbsd_supply_gregset (const struct sparc_gregset *gregset,

                            struct regcache *regcache,

                            int regnum, const void *gregs)

{

  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);

  if (sparc32)

    sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);

  else

    sparc64_supply_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);

}

static void

sparc64nbsd_collect_gregset (const struct sparc_gregset *gregset,

                             const struct regcache *regcache,

                             int regnum, void *gregs)

{

  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);

  if (sparc32)

    sparc32_collect_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);

  else

    sparc64_collect_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);

}

static void

sparc64nbsd_supply_fpregset (struct regcache *regcache,

                             int regnum, const void *fpregs)

{

  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);

  if (sparc32)

    sparc32_supply_fpregset (regcache, regnum, fpregs);

  else

    sparc64_supply_fpregset (regcache, regnum, fpregs);

}

static void

sparc64nbsd_collect_fpregset (const struct regcache *regcache,

                              int regnum, void *fpregs)

{

  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);

  if (sparc32)

    sparc32_collect_fpregset (regcache, regnum, fpregs);

  else

    sparc64_collect_fpregset (regcache, regnum, fpregs);

}

/* Determine whether `gregset_t' contains register REGNUM.  */

static int

sparc64nbsd_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)

{

  if (gdbarch_ptr_bit (gdbarch) == 32)

    return sparc32_gregset_supplies_p (gdbarch, regnum);

  /* Integer registers.  */

  if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)

      || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)

      || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)

      || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))

    return 1;

  /* Control registers.  */

  if (regnum == SPARC64_PC_REGNUM

      || regnum == SPARC64_NPC_REGNUM

      || regnum == SPARC64_STATE_REGNUM

      || regnum == SPARC64_Y_REGNUM)

    return 1;

  return 0;

}

/* Determine whether `fpregset_t' contains register REGNUM.  */

static int

sparc64nbsd_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)

{

  if (gdbarch_ptr_bit (gdbarch) == 32)

    return sparc32_fpregset_supplies_p (gdbarch, regnum);

  /* Floating-point registers.  */

  if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)

      || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))

    return 1;

  /* Control registers.  */

  if (regnum == SPARC64_FSR_REGNUM)

    return 1;

  return 0;

}

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

#include <sys/types.h>

#include <machine/pcb.h>

#include "bsd-kvm.h"

static int

sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)

{

  u_int64_t state;

  int regnum;

  /* The following is true for NetBSD 1.6.2:

     The pcb contains %sp and %pc, %pstate and %cwp.  From this

     information 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_sp == 0)

    return 0;

  /* If the program counter is zero, this is probably a core dump, and

     we can get %pc from the stack.  */

  if (pcb->pcb_pc == 0)

      read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8),

                  (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);

  regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);

  regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);

  state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;

  regcache_raw_supply (regcache, SPARC64_STATE_REGNUM, &state);

  sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);

  return 1;

}

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

void _initialize_sparc64nbsd_nat (void);

void

_initialize_sparc64nbsd_nat (void)

{

  sparc_supply_gregset = sparc64nbsd_supply_gregset;

  sparc_collect_gregset = sparc64nbsd_collect_gregset;

  sparc_supply_fpregset = sparc64nbsd_supply_fpregset;

  sparc_collect_fpregset = sparc64nbsd_collect_fpregset;

  sparc_gregset_supplies_p = sparc64nbsd_gregset_supplies_p;

  sparc_fpregset_supplies_p = sparc64nbsd_fpregset_supplies_p;

  /* We've got nothing to add to the generic SPARC target.  */

  add_target (sparc_target ());

  /* Support debugging kernel virtual memory images.  */

  bsd_kvm_add_target (sparc64nbsd_supply_pcb);

}