gdb/arch/arc.c

   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
  19 #include "arc.h"
  20 #include <stdlib.h>
  21 #include <unordered_map>
  22 #include <string>
  23
  24 /* Target description features.  */
  25 #include "features/arc/v1-core.c"
  26 #include "features/arc/v1-aux.c"
  27 #include "features/arc/v2-core.c"
  28 #include "features/arc/v2-aux.c"
  29
  30 #ifndef GDBSERVER
  31 #define STATIC_IN_GDB static
  32 #else
  33 #define STATIC_IN_GDB
  34 #endif
  35
  36 STATIC_IN_GDB target_desc_up
  37 arc_create_target_description (const struct arc_arch_features &features)
  38 {
  39   /* Create a new target description.  */
  40   target_desc_up tdesc = allocate_target_description ();
  41
  42 #ifndef IN_PROCESS_AGENT
  43   std::string arch_name;
  44
  45   /* Architecture names here must match the ones in
  46      ARCH_INFO_STRUCT in bfd/cpu-arc.c.  */
  47   if (features.isa == ARC_ISA_ARCV1 && features.reg_size == 4)
  48       arch_name = "arc:ARC700";
  49   else if (features.isa == ARC_ISA_ARCV2 && features.reg_size == 4)
  50       arch_name = "arc:ARCv2";
  51   else
  52     {
  53       std::string msg = string_printf
  54         ("Cannot determine architecture: ISA=%d; bitness=%d",
  55          features.isa, 8 * features.reg_size);
  56       gdb_assert_not_reached ("%s", msg.c_str ());
  57     }
  58
  59   set_tdesc_architecture (tdesc.get (), arch_name.c_str ());
  60 #endif
  61
  62   long regnum = 0;
  63
  64   switch (features.isa)
  65     {
  66     case ARC_ISA_ARCV1:
  67       regnum = create_feature_arc_v1_core (tdesc.get (), regnum);
  68       regnum = create_feature_arc_v1_aux (tdesc.get (), regnum);
  69       break;
  70     case ARC_ISA_ARCV2:
  71       regnum = create_feature_arc_v2_core (tdesc.get (), regnum);
  72       regnum = create_feature_arc_v2_aux (tdesc.get (), regnum);
  73       break;
  74     default:
  75       std::string msg = string_printf
  76         ("Cannot choose target description XML: %d", features.isa);
  77       gdb_assert_not_reached ("%s", msg.c_str ());
  78     }
  79
  80   return tdesc;
  81 }
  82
  83 #ifndef GDBSERVER
  84
  85 /* Wrapper used by std::unordered_map to generate hash for features set.  */
  86 struct arc_arch_features_hasher
  87 {
  88   std::size_t
  89   operator() (const arc_arch_features &features) const noexcept
  90   {
  91     return features.hash ();
  92   }
  93 };
  94
  95 /* Cache of previously created target descriptions, indexed by the hash
  96    of the features set used to create them.  */
  97 static std::unordered_map<arc_arch_features,
  98                           const target_desc_up,
  99                           arc_arch_features_hasher> arc_tdesc_cache;
 100
 101 /* See arch/arc.h.  */
 102
 103 const target_desc *
 104 arc_lookup_target_description (const struct arc_arch_features &features)
 105 {
 106   /* Lookup in the cache first.  If found, return the pointer from the
 107      "target_desc_up" type which is a "unique_ptr".  This should be fine
 108      as the "arc_tdesc_cache" will persist until GDB terminates.  */
 109   const auto it = arc_tdesc_cache.find (features);
 110   if (it != arc_tdesc_cache.end ())
 111     return it->second.get ();
 112
 113   target_desc_up tdesc = arc_create_target_description (features);
 114
 115
 116   /* Add to the cache, and return a pointer borrowed from the
 117      target_desc_up.  This is safe as the cache (and the pointers
 118      contained within it) are not deleted until GDB exits.  */
 119   target_desc *ptr = tdesc.get ();
 120   arc_tdesc_cache.emplace (features, std::move (tdesc));
 121   return ptr;
 122 }
 123
 124 #endif /* !GDBSERVER */