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/* Target-dependent code for OpenBSD/hppa

   Copyright (C) 2004, 2005, 2006, 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 "osabi.h"

#include "regcache.h"

#include "regset.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include "hppa-tdep.h"

#include "hppabsd-tdep.h"

/* Core file support.  */

/* Sizeof `struct reg' in <machine/reg.h>.  */

#define HPPAOBSD_SIZEOF_GREGS   (34 * 4)

/* Sizeof `struct fpreg' in <machine/reg.h>.  */

#define HPPAOBSD_SIZEOF_FPREGS  (32 * 8)

/* Supply register REGNUM from the buffer specified by GREGS and LEN

   in the general-purpose register set REGSET to register cache

   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

static void

hppaobsd_supply_gregset (const struct regset *regset,

                         struct regcache *regcache,

                         int regnum, const void *gregs, size_t len)

{

  const gdb_byte *regs = gregs;

  size_t offset;

  int i;

  gdb_assert (len >= HPPAOBSD_SIZEOF_GREGS);

  for (i = HPPA_R1_REGNUM, offset = 4; i <= HPPA_R31_REGNUM; i++, offset += 4)

    {

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

        regcache_raw_supply (regcache, i, regs + offset);

    }

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

    regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);

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

    regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);

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

    regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);

}

/* Supply register REGNUM from the buffer specified by FPREGS and LEN

   in the floating-point register set REGSET to register cache

   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

static void

hppaobsd_supply_fpregset (const struct regset *regset,

                          struct regcache *regcache,

                          int regnum, const void *fpregs, size_t len)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  const gdb_byte *regs = fpregs;

  int i;

  gdb_assert (len >= HPPAOBSD_SIZEOF_FPREGS);

  for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i++)

    {

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

        regcache_raw_supply (regcache, i, regs + (i - HPPA_FP0_REGNUM) * 4);

    }

}

/* OpenBSD/hppa register sets.  */

static struct regset hppaobsd_gregset =

{

  NULL,

  hppaobsd_supply_gregset

};

static struct regset hppaobsd_fpregset =

{

  NULL,

  hppaobsd_supply_fpregset

};

/* Return the appropriate register set for the core section identified

   by SECT_NAME and SECT_SIZE.  */

static const struct regset *

hppaobsd_regset_from_core_section (struct gdbarch *gdbarch,

                                  const char *sect_name, size_t sect_size)

{

  if (strcmp (sect_name, ".reg") == 0 && sect_size >= HPPAOBSD_SIZEOF_GREGS)

    return &hppaobsd_gregset;

  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= HPPAOBSD_SIZEOF_FPREGS)

    return &hppaobsd_fpregset;

  return NULL;

}

static void

hppaobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  /* Obviously OpenBSD is BSD-based.  */

  hppabsd_init_abi (info, gdbarch);

  /* Core file support.  */

  set_gdbarch_regset_from_core_section

    (gdbarch, hppaobsd_regset_from_core_section);

}

/* OpenBSD uses uses the traditional NetBSD core file format, even for

   ports that use ELF.  */

#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF

static enum gdb_osabi

hppaobsd_core_osabi_sniffer (bfd *abfd)

{

  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)

    return GDB_OSABI_NETBSD_CORE;

  return GDB_OSABI_UNKNOWN;

}

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

void _initialize_hppabsd_tdep (void);

void

_initialize_hppabsd_tdep (void)

{

  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */

  gdbarch_register_osabi_sniffer (bfd_arch_hppa, bfd_target_unknown_flavour,

                                  hppaobsd_core_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_OPENBSD_ELF,

                          hppaobsd_init_abi);

}