Home | History | Annotate | Line # | Download | only in arch 
      1 /* Copyright (C) 2017-2024 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_up 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 */
     88