1/* BFD support for AArch64.
2   Copyright (C) 2009-2017 Free Software Foundation, Inc.
3   Contributed by ARM Ltd.
4
5   This file is part of BFD, the Binary File Descriptor library.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; see the file COPYING3. If not,
19   see <http://www.gnu.org/licenses/>.  */
20
21#include "sysdep.h"
22#include "bfd.h"
23#include "libbfd.h"
24#include "libiberty.h"
25
26/* This routine is provided two arch_infos and works out which Aarch64
27   machine which would be compatible with both and returns a pointer
28   to its info structure.  */
29
30static const bfd_arch_info_type *
31compatible (const bfd_arch_info_type * a, const bfd_arch_info_type * b)
32{
33  /* If a & b are for different architecture we can do nothing.  */
34  if (a->arch != b->arch)
35    return NULL;
36
37  /* If a & b are for the same machine then all is well.  */
38  if (a->mach == b->mach)
39    return a;
40
41  /* Don't allow mixing ilp32 with lp64.  */
42  if ((a->mach & bfd_mach_aarch64_ilp32) != (b->mach & bfd_mach_aarch64_ilp32))
43    return NULL;
44
45  /* Otherwise if either a or b is the 'default' machine
46     then it can be polymorphed into the other.  */
47  if (a->the_default)
48    return b;
49
50  if (b->the_default)
51    return a;
52
53  /* So far all newer cores are
54     supersets of previous cores.  */
55  if (a->mach < b->mach)
56    return b;
57  else if (a->mach > b->mach)
58    return a;
59
60  /* Never reached!  */
61  return NULL;
62}
63
64static struct
65{
66  unsigned int mach;
67  char *name;
68}
69processors[] =
70{
71  /* These two are example CPUs supported in GCC, once we have real
72     CPUs they will be removed.  */
73  { bfd_mach_aarch64, "example-1" },
74  { bfd_mach_aarch64, "example-2" }
75};
76
77static bfd_boolean
78scan (const struct bfd_arch_info *info, const char *string)
79{
80  int i;
81
82  /* First test for an exact match.  */
83  if (strcasecmp (string, info->printable_name) == 0)
84    return TRUE;
85
86  /* Next check for a processor name instead of an Architecture name.  */
87  for (i = sizeof (processors) / sizeof (processors[0]); i--;)
88    {
89      if (strcasecmp (string, processors[i].name) == 0)
90	break;
91    }
92
93  if (i != -1 && info->mach == processors[i].mach)
94    return TRUE;
95
96  /* Finally check for the default architecture.  */
97  if (strcasecmp (string, "aarch64") == 0)
98    return info->the_default;
99
100  return FALSE;
101}
102
103#define N(NUMBER, PRINT, WORDSIZE, DEFAULT, NEXT)		\
104  { WORDSIZE, WORDSIZE, 8, bfd_arch_aarch64, NUMBER,		\
105    "aarch64", PRINT, 4, DEFAULT, compatible, scan,		\
106    bfd_arch_default_fill, NEXT }
107
108static const bfd_arch_info_type bfd_aarch64_arch_ilp32 =
109  N (bfd_mach_aarch64_ilp32, "aarch64:ilp32", 32, FALSE, NULL);
110
111const bfd_arch_info_type bfd_aarch64_arch =
112  N (0, "aarch64", 64, TRUE, &bfd_aarch64_arch_ilp32);
113
114bfd_boolean
115bfd_is_aarch64_special_symbol_name (const char *name, int type)
116{
117  if (!name || name[0] != '$')
118    return FALSE;
119  if (name[1] == 'x' || name[1] == 'd')
120    type &= BFD_AARCH64_SPECIAL_SYM_TYPE_MAP;
121  else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p')
122    type &= BFD_AARCH64_SPECIAL_SYM_TYPE_TAG;
123  else
124    return FALSE;
125
126  return (type != 0 && (name[2] == 0 || name[2] == '.'));
127}
128