gdbserver/linux-aarch64-tdesc.cc

   1 /* GNU/Linux/aarch64 specific target description, for the remote server
   2    for GDB.
   3    Copyright (C) 2017-2024 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   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.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #include "linux-aarch64-tdesc.h"
  22
  23 #include "tdesc.h"
  24 #include "arch/aarch64.h"
  25 #include "linux-aarch32-low.h"
  26 #include <inttypes.h>
  27 #include <unordered_map>
  28
  29 /* Create the aarch64 target description.  */
  30
  31 const target_desc *
  32 aarch64_linux_read_description (const aarch64_features &features)
  33 {
  34   /* All possible aarch64 target descriptors.  This map must live within
  35      this function as the in-process-agent calls this function from a
  36      constructor function, when globals might not yet have been
  37      initialised.  */
  38   static std::unordered_map<aarch64_features, target_desc *> tdesc_aarch64_map;
  39
  40   if (features.vq > AARCH64_MAX_SVE_VQ)
  41     error (_("VQ is %" PRIu64 ", maximum supported value is %d"), features.vq,
  42            AARCH64_MAX_SVE_VQ);
  43
  44   if (features.svq > AARCH64_MAX_SVE_VQ)
  45     error (_("Streaming svq is %" PRIu8 ", maximum supported value is %d"),
  46            features.svq,
  47            AARCH64_MAX_SVE_VQ);
  48
  49   struct target_desc *tdesc = tdesc_aarch64_map[features];
  50
  51   if (tdesc == NULL)
  52     {
  53       tdesc = aarch64_create_target_description (features);
  54
  55       /* Configure the expedited registers.  By default we include x29, sp
  56          and pc, but we allow for up to 6 pointers as this is (currently)
  57          the most that we push.
  58
  59          Calling init_target_desc takes a copy of all the strings pointed
  60          to by expedited_registers so this vector only needs to live for
  61          the scope of this function.  */
  62       std::vector<const char *> expedited_registers (6);
  63       expedited_registers.push_back ("x29");
  64       expedited_registers.push_back ("sp");
  65       expedited_registers.push_back ("pc");
  66
  67       if (features.vq > 0)
  68         expedited_registers.push_back ("vg");
  69       if (features.svq > 0)
  70         expedited_registers.push_back ("svg");
  71
  72       expedited_registers.push_back (nullptr);
  73
  74       init_target_desc (tdesc, (const char **) expedited_registers.data ());
  75
  76       tdesc_aarch64_map[features] = tdesc;
  77     }
  78
  79   return tdesc;
  80 }