bfd/cpu-aarch64.c

   1 /* BFD support for AArch64.
   2    Copyright (C) 2009-2019 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
  30 static const bfd_arch_info_type *
  31 compatible (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
  64 static struct
  65 {
  66   unsigned int mach;
  67   char *name;
  68 }
  69 processors[] =
  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
  77 static bfd_boolean
  78 scan (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
 108 static const bfd_arch_info_type bfd_aarch64_arch_ilp32 =
 109   N (bfd_mach_aarch64_ilp32, "aarch64:ilp32", 32, FALSE, NULL);
 110
 111 const bfd_arch_info_type bfd_aarch64_arch =
 112   N (0, "aarch64", 64, TRUE, &bfd_aarch64_arch_ilp32);
 113
 114 bfd_boolean
 115 bfd_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 }