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/* Target-dependent code for FreeBSD/alpha.

   Copyright (C) 2001, 2002, 2003, 2006, 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 "value.h"

#include "osabi.h"

#include "alpha-tdep.h"

#include "solib-svr4.h"

static int

alphafbsd_return_in_memory (struct type *type)

{

  enum type_code code;

  int i;

  /* All aggregate types that won't fit in a register must be returned

     in memory.  */

  if (TYPE_LENGTH (type) > ALPHA_REGISTER_SIZE)

    return 1;

  /* The only aggregate types that can be returned in a register are

     structs and unions.  Arrays must be returned in memory.  */

  code = TYPE_CODE (type);

  if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION)

    return 1;

  /* We need to check if this struct/union is "integer" like.  For

     this to be true, the offset of each adressable subfield must be

     zero.  Note that bit fields are not addressable.  */

  for (i = 0; i < TYPE_NFIELDS (type); i++)

    {

      /* If the field bitsize is non-zero, it isn't adressable.  */

      if (TYPE_FIELD_BITPOS (type, i) != 0

          && TYPE_FIELD_BITSIZE (type, i) == 0)

        return 1;

    }

  return 0;

}

/* Support for signal handlers.  */

/* Return whether PC is in a BSD sigtramp routine.  */

CORE_ADDR alphafbsd_sigtramp_start = 0x11ffff68;

CORE_ADDR alphafbsd_sigtramp_end = 0x11ffffe0;

static int

alphafbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)

{

  return (pc >= alphafbsd_sigtramp_start && pc < alphafbsd_sigtramp_end);

}

static LONGEST

alphafbsd_sigtramp_offset (CORE_ADDR pc)

{

  return pc - alphafbsd_sigtramp_start;

}

/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp

   routine, return the address of the associated sigcontext structure.  */

static CORE_ADDR

alphafbsd_sigcontext_addr (struct frame_info *next_frame)

{

  return frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM) + 24;

}

/* FreeBSD 5.0-RELEASE or later.  */

static void

alphafbsd_init_abi (struct gdbarch_info info,

                    struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Hook into the DWARF CFI frame unwinder.  */

  alpha_dwarf2_init_abi (info, gdbarch);

  /* Hook into the MDEBUG frame unwinder.  */

  alpha_mdebug_init_abi (info, gdbarch);

  /* FreeBSD/alpha has SVR4-style shared libraries.  */

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_lp64_fetch_link_map_offsets);

  tdep->dynamic_sigtramp_offset = alphafbsd_sigtramp_offset;

  tdep->sigcontext_addr = alphafbsd_sigcontext_addr;

  tdep->pc_in_sigtramp = alphafbsd_pc_in_sigtramp;

  tdep->return_in_memory = alphafbsd_return_in_memory;

  tdep->sc_pc_offset = 288;

  tdep->sc_regs_offset = 24;

  tdep->sc_fpregs_offset = 320;

  tdep->jb_pc = 2;

  tdep->jb_elt_size = 8;

}

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

void _initialize_alphafbsd_tdep (void);

void

_initialize_alphafbsd_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_FREEBSD_ELF,

                          alphafbsd_init_abi);

}