bfd/cpu-aarch64.c

   1 /* BFD support for AArch64.
   2    Copyright (C) 2009-2023 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   { bfd_mach_aarch64,     "cortex-a720"     },
  78   { bfd_mach_aarch64,     "cortex-x4"       },
  79 };
  80
  81 static bool
  82 scan (const struct bfd_arch_info *info, const char *string)
  83 {
  84   int i;
  85
  86   /* First test for an exact match.  */
  87   if (strcasecmp (string, info->printable_name) == 0)
  88     return true;
  89
  90   /* If there is a prefix of "aarch64:" then skip it.  */
  91   const char * colon;
  92   if ((colon = strchr (string, ':')) != NULL)
  93     {
  94       if (strncasecmp (string, "aarch64", colon - string) != 0)
  95         return false;
  96       string = colon + 1;
  97     }
  98
  99   /* Next check for a processor name instead of an Architecture name.  */
 100   for (i = sizeof (processors) / sizeof (processors[0]); i--;)
 101     {
 102       if (strcasecmp (string, processors[i].name) == 0)
 103         break;
 104     }
 105
 106   if (i != -1 && info->mach == processors[i].mach)
 107     return true;
 108
 109   /* Finally check for the default architecture.  */
 110   if (strcasecmp (string, "aarch64") == 0)
 111     return info->the_default;
 112
 113   return false;
 114 }
 115
 116 /* Figure out if llp64 is default */
 117 #if DEFAULT_VECTOR == aarch64_pe_le_vec
 118 #define LLP64_DEFAULT true
 119 #define AARCH64_DEFAULT false
 120 #else
 121 #define LLP64_DEFAULT false
 122 #define AARCH64_DEFAULT true
 123 #endif
 124
 125 #define N(NUMBER, PRINT, WORDSIZE, ADDRSIZE, DEFAULT, NEXT)             \
 126   { WORDSIZE, ADDRSIZE, 8, bfd_arch_aarch64, NUMBER,            \
 127      "aarch64", PRINT, 4, DEFAULT, compatible, scan,            \
 128        bfd_arch_default_fill, NEXT, 0 }
 129
 130  static const bfd_arch_info_type bfd_aarch64_arch_v8_r =
 131   N (bfd_mach_aarch64_8R, "aarch64:armv8-r", 64, 64, false, NULL);
 132
 133 static const bfd_arch_info_type bfd_aarch64_arch_ilp32 =
 134   N (bfd_mach_aarch64_ilp32, "aarch64:ilp32", 32, 32, false,
 135      &bfd_aarch64_arch_v8_r);
 136
 137 static const bfd_arch_info_type bfd_aarch64_arch_llp64 =
 138   N (bfd_mach_aarch64_llp64, "aarch64:llp64", 32, 64, LLP64_DEFAULT,
 139      &bfd_aarch64_arch_ilp32);
 140
 141  const bfd_arch_info_type bfd_aarch64_arch =
 142   N (0, "aarch64", 64, 64, AARCH64_DEFAULT, &bfd_aarch64_arch_llp64);
 143
 144 bool
 145 bfd_is_aarch64_special_symbol_name (const char *name, int type)
 146 {
 147   if (!name || name[0] != '$')
 148     return false;
 149   if (name[1] == 'x' || name[1] == 'd')
 150     type &= BFD_AARCH64_SPECIAL_SYM_TYPE_MAP;
 151   else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p')
 152     type &= BFD_AARCH64_SPECIAL_SYM_TYPE_TAG;
 153   else
 154     return false;
 155
 156   return (type != 0 && (name[2] == 0 || name[2] == '.'));
 157 }