gdb/alphafbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/Alpha.
   2    Copyright 2001, 2002 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "value.h"
  23
  24 #include "alpha-tdep.h"
  25
  26 static int
  27 alphafbsd_use_struct_convention (int gcc_p, struct type *type)
  28 {
  29   enum type_code code;
  30   int i;
  31
  32   /* All aggregate types that won't fit in a register must be returned
  33      in memory.  */
  34   if (TYPE_LENGTH (type) > REGISTER_SIZE)
  35     return 1;
  36
  37   /* The only aggregate types that can be returned in a register are
  38      structs and unions.  Arrays must be returned in memory.  */
  39   code = TYPE_CODE (type);
  40   if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION)
  41     return 1;
  42
  43   /* We need to check if this struct/union is "integer" like.  For
  44      this to be true, the offset of each adressable subfield must be
  45      zero.  Note that bit fields are not addressable.  */
  46   for (i = 0; i < TYPE_NFIELDS (type); i++)
  47     {
  48       /* If the field bitsize is non-zero, it isn't adressable.  */
  49       if (TYPE_FIELD_BITPOS (type, i) != 0
  50           && TYPE_FIELD_BITSIZE (type, i) == 0)
  51         return 1;
  52     }
  53
  54   return 0;
  55 }
  56
  57 static int
  58 alphafbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
  59 {
  60   /* FIXME */
  61   return 0;
  62 }
  63
  64 static void
  65 alphafbsd_init_abi (struct gdbarch_info info,
  66                     struct gdbarch *gdbarch)
  67 {
  68   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  69
  70   set_gdbarch_pc_in_sigtramp (gdbarch, alphafbsd_pc_in_sigtramp);
  71
  72   set_gdbarch_use_struct_convention (gdbarch, alphafbsd_use_struct_convention);
  73 }
  74
  75 void
  76 _initialize_alphafbsd_tdep (void)
  77 {
  78   alpha_gdbarch_register_os_abi (ALPHA_ABI_FREEBSD, alphafbsd_init_abi);
  79 }