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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);
}