1/* Target-dependent code for FreeBSD/Alpha.
2   Copyright 2001, 2002, 2003 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#include "osabi.h"
24
25#include "alpha-tdep.h"
26
27static int
28alphafbsd_use_struct_convention (int gcc_p, struct type *type)
29{
30  enum type_code code;
31  int i;
32
33  /* All aggregate types that won't fit in a register must be returned
34     in memory.  */
35  if (TYPE_LENGTH (type) > ALPHA_REGISTER_SIZE)
36    return 1;
37
38  /* The only aggregate types that can be returned in a register are
39     structs and unions.  Arrays must be returned in memory.  */
40  code = TYPE_CODE (type);
41  if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION)
42    return 1;
43
44  /* We need to check if this struct/union is "integer" like.  For
45     this to be true, the offset of each adressable subfield must be
46     zero.  Note that bit fields are not addressable.  */
47  for (i = 0; i < TYPE_NFIELDS (type); i++)
48    {
49      /* If the field bitsize is non-zero, it isn't adressable.  */
50      if (TYPE_FIELD_BITPOS (type, i) != 0
51	  && TYPE_FIELD_BITSIZE (type, i) == 0)
52	return 1;
53    }
54
55  return 0;
56}
57
58
59/* Support for signal handlers.  */
60
61/* Return whether PC is in a BSD sigtramp routine.  */
62
63CORE_ADDR alphafbsd_sigtramp_start = 0x11ffff68;
64CORE_ADDR alphafbsd_sigtramp_end = 0x11ffffe0;
65
66static int
67alphafbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
68{
69  return (pc >= alphafbsd_sigtramp_start && pc < alphafbsd_sigtramp_end);
70}
71
72static LONGEST
73alphafbsd_sigtramp_offset (CORE_ADDR pc)
74{
75  return pc - alphafbsd_sigtramp_start;
76}
77
78/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
79   routine, return the address of the associated sigcontext structure.  */
80
81static CORE_ADDR
82alphafbsd_sigcontext_addr (struct frame_info *next_frame)
83{
84  return frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM) + 24;
85}
86
87/* FreeBSD 5.0-RELEASE or later.  */
88
89static void
90alphafbsd_init_abi (struct gdbarch_info info,
91                    struct gdbarch *gdbarch)
92{
93  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
94
95  /* Hook into the DWARF CFI frame unwinder.  */
96  alpha_dwarf2_init_abi (info, gdbarch);
97
98  /* Hook into the MDEBUG frame unwinder.  */
99  alpha_mdebug_init_abi (info, gdbarch);
100
101  set_gdbarch_deprecated_use_struct_convention (gdbarch, alphafbsd_use_struct_convention);
102
103  tdep->dynamic_sigtramp_offset = alphafbsd_sigtramp_offset;
104  tdep->sigcontext_addr = alphafbsd_sigcontext_addr;
105  tdep->pc_in_sigtramp = alphafbsd_pc_in_sigtramp;
106  tdep->sc_pc_offset = 288;
107  tdep->sc_regs_offset = 24;
108  tdep->sc_fpregs_offset = 320;
109
110  tdep->jb_pc = 2;
111  tdep->jb_elt_size = 8;
112}
113
114
115/* Provide a prototype to silence -Wmissing-prototypes.  */
116void _initialize_alphafbsd_tdep (void);
117
118void
119_initialize_alphafbsd_tdep (void)
120{
121  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_FREEBSD_ELF,
122                          alphafbsd_init_abi);
123}
124