xref: /netbsd-src/external/gpl3/gdb.old/dist/bfd/cpu-aarch64.c (revision 4439cfd0acf9c7dc90625e5cd83b2317a9ab8967)
1 /* BFD support for AArch64.
2    Copyright (C) 2009-2022 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 #include "cpu-aarch64.h"
26 
27 /* This routine is provided two arch_infos and works out which Aarch64
28    machine which would be compatible with both and returns a pointer
29    to its info structure.  */
30 
31 static const bfd_arch_info_type *
32 compatible (const bfd_arch_info_type * a, const bfd_arch_info_type * b)
33 {
34   /* If a & b are for different architecture we can do nothing.  */
35   if (a->arch != b->arch)
36     return NULL;
37 
38   /* If a & b are for the same machine then all is well.  */
39   if (a->mach == b->mach)
40     return a;
41 
42   /* Don't allow mixing data models.  */
43   if ((a->mach ^ b->mach) & (bfd_mach_aarch64_ilp32 | bfd_mach_aarch64_llp64))
44     return NULL;
45 
46   /* Otherwise if either a or b is the 'default' machine
47      then it can be polymorphed into the other.  */
48   if (a->the_default)
49     return b;
50 
51   if (b->the_default)
52     return a;
53 
54   /* So far all newer cores are
55      supersets of previous cores.  */
56   if (a->mach < b->mach)
57     return b;
58   else if (a->mach > b->mach)
59     return a;
60 
61   /* Never reached!  */
62   return NULL;
63 }
64 
65 static struct
66 {
67   unsigned int mach;
68   char *name;
69 }
70 processors[] =
71 {
72   { bfd_mach_aarch64,	  "cortex-a34"	    },
73   { bfd_mach_aarch64,	  "cortex-a65"	    },
74   { bfd_mach_aarch64,	  "cortex-a65ae"    },
75   { bfd_mach_aarch64,	  "cortex-a76ae"    },
76   { bfd_mach_aarch64,	  "cortex-a77"	    }
77 };
78 
79 static bool
80 scan (const struct bfd_arch_info *info, const char *string)
81 {
82   int i;
83 
84   /* First test for an exact match.  */
85   if (strcasecmp (string, info->printable_name) == 0)
86     return true;
87 
88   /* If there is a prefix of "aarch64:" then skip it.  */
89   const char * colon;
90   if ((colon = strchr (string, ':')) != NULL)
91     {
92       if (strncasecmp (string, "aarch64", colon - string) != 0)
93 	return false;
94       string = colon + 1;
95     }
96 
97   /* Next check for a processor name instead of an Architecture name.  */
98   for (i = sizeof (processors) / sizeof (processors[0]); i--;)
99     {
100       if (strcasecmp (string, processors[i].name) == 0)
101 	break;
102     }
103 
104   if (i != -1 && info->mach == processors[i].mach)
105     return true;
106 
107   /* Finally check for the default architecture.  */
108   if (strcasecmp (string, "aarch64") == 0)
109     return info->the_default;
110 
111   return false;
112 }
113 
114 /* Figure out if llp64 is default */
115 #if DEFAULT_VECTOR == aarch64_pe_le_vec
116 #define LLP64_DEFAULT true
117 #define AARCH64_DEFAULT false
118 #else
119 #define LLP64_DEFAULT false
120 #define AARCH64_DEFAULT true
121 #endif
122 
123 #define N(NUMBER, PRINT, WORDSIZE, ADDRSIZE, DEFAULT, NEXT)		\
124   { WORDSIZE, ADDRSIZE, 8, bfd_arch_aarch64, NUMBER,		\
125      "aarch64", PRINT, 4, DEFAULT, compatible, scan,		\
126        bfd_arch_default_fill, NEXT, 0 }
127 
128  static const bfd_arch_info_type bfd_aarch64_arch_v8_r =
129   N (bfd_mach_aarch64_8R, "aarch64:armv8-r", 64, 64, false, NULL);
130 
131 static const bfd_arch_info_type bfd_aarch64_arch_ilp32 =
132   N (bfd_mach_aarch64_ilp32, "aarch64:ilp32", 32, 32, false,
133      &bfd_aarch64_arch_v8_r);
134 
135 static const bfd_arch_info_type bfd_aarch64_arch_llp64 =
136   N (bfd_mach_aarch64_llp64, "aarch64:llp64", 32, 64, LLP64_DEFAULT,
137      &bfd_aarch64_arch_ilp32);
138 
139  const bfd_arch_info_type bfd_aarch64_arch =
140   N (0, "aarch64", 64, 64, AARCH64_DEFAULT, &bfd_aarch64_arch_llp64);
141 
142 bool
143 bfd_is_aarch64_special_symbol_name (const char *name, int type)
144 {
145   if (!name || name[0] != '$')
146     return false;
147   if (name[1] == 'x' || name[1] == 'd')
148     type &= BFD_AARCH64_SPECIAL_SYM_TYPE_MAP;
149   else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p')
150     type &= BFD_AARCH64_SPECIAL_SYM_TYPE_TAG;
151   else
152     return false;
153 
154   return (type != 0 && (name[2] == 0 || name[2] == '.'));
155 }
156