gdb/arch/arc.h

   1 /* Copyright (C) 2017-2020 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef ARCH_ARC_H
  19 #define ARCH_ARC_H
  20
  21 #include "gdbsupport/tdesc.h"
  22
  23 /* Supported ARC ISAs.  */
  24 enum arc_isa
  25 {
  26   ARC_ISA_ARCV1 = 1,  /* a.k.a. ARCompact (ARC600, ARC700)  */
  27   ARC_ISA_ARCV2       /* such as ARC EM and ARC HS  */
  28 };
  29
  30 struct arc_arch_features
  31 {
  32   arc_arch_features (int reg_size, arc_isa isa)
  33     : reg_size (reg_size), isa (isa)
  34   {}
  35
  36   /* Register size in bytes.  Possible values are 4, and 8.  A 0 indicates
  37      an uninitialised value.  */
  38   const int reg_size;
  39
  40   /* See ARC_ISA enum.  */
  41   const arc_isa isa;
  42
  43   /* Equality operator.  */
  44   bool operator== (const struct arc_arch_features &rhs) const
  45   {
  46     return (reg_size == rhs.reg_size && isa == rhs.isa);
  47   }
  48
  49   /* Inequality operator.  */
  50   bool operator!= (const struct arc_arch_features &rhs) const
  51   {
  52     return !(*this == rhs);
  53   }
  54
  55   /* Used by std::unordered_map to hash the feature sets.  The hash is
  56      calculated in the manner below:
  57      REG_SIZE |  ISA
  58       5-bits  | 4-bits  */
  59
  60   std::size_t hash () const noexcept
  61   {
  62     std::size_t val = ((reg_size & 0x1f) << 8 | (isa & 0xf) << 0);
  63     return val;
  64   }
  65 };
  66
  67 #ifdef GDBSERVER
  68
  69 /* Create and return a target description that is compatible with FEATURES.
  70    The only external client of this must be the gdbserver which manipulates
  71    the returned data.  */
  72
  73 target_desc *arc_create_target_description
  74         (const struct arc_arch_features &features);
  75
  76 #else
  77
  78 /* Lookup the cache for a target description matching the FEATURES.
  79    If nothing is found, then create one and return it.  */
  80
  81 const target_desc *arc_lookup_target_description
  82         (const struct arc_arch_features &features);
  83
  84 #endif /* GDBSERVER */
  85
  86
  87 #endif /* ARCH_ARC_H */