gdb/arch/aarch64.c

   1 /* Copyright (C) 2017-2023 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 #include "gdbsupport/common-defs.h"
  19 #include "aarch64.h"
  20 #include <stdlib.h>
  21
  22 #include "../features/aarch64-core.c"
  23 #include "../features/aarch64-fpu.c"
  24 #include "../features/aarch64-sve.c"
  25 #include "../features/aarch64-pauth.c"
  26 #include "../features/aarch64-mte.c"
  27 #include "../features/aarch64-tls.c"
  28
  29 /* See arch/aarch64.h.  */
  30
  31 target_desc *
  32 aarch64_create_target_description (const aarch64_features &features)
  33 {
  34   target_desc_up tdesc = allocate_target_description ();
  35
  36 #ifndef IN_PROCESS_AGENT
  37   set_tdesc_architecture (tdesc.get (), "aarch64");
  38 #endif
  39
  40   long regnum = 0;
  41
  42   regnum = create_feature_aarch64_core (tdesc.get (), regnum);
  43
  44   if (features.vq == 0)
  45     regnum = create_feature_aarch64_fpu (tdesc.get (), regnum);
  46   else
  47     regnum = create_feature_aarch64_sve (tdesc.get (), regnum, features.vq);
  48
  49   if (features.pauth)
  50     regnum = create_feature_aarch64_pauth (tdesc.get (), regnum);
  51
  52   /* Memory tagging extension registers.  */
  53   if (features.mte)
  54     regnum = create_feature_aarch64_mte (tdesc.get (), regnum);
  55
  56   /* TLS registers.  */
  57   if (features.tls > 0)
  58     regnum = create_feature_aarch64_tls (tdesc.get (), regnum, features.tls);
  59
  60   return tdesc.release ();
  61 }
  62
  63 /* See arch/aarch64.h.  */
  64
  65 CORE_ADDR
  66 aarch64_remove_top_bits (CORE_ADDR pointer, CORE_ADDR mask)
  67 {
  68   /* The VA range select bit is 55.  This bit tells us if we have a
  69      kernel-space address or a user-space address.  */
  70   bool kernel_address = (pointer & VA_RANGE_SELECT_BIT_MASK) != 0;
  71
  72   /* Remove the top non-address bits.  */
  73   pointer &= ~mask;
  74
  75   /* Sign-extend if we have a kernel-space address.  */
  76   if (kernel_address)
  77     pointer |= mask;
  78
  79   return pointer;
  80 }
  81
  82 /* See arch/aarch64.h.  */
  83
  84 CORE_ADDR
  85 aarch64_mask_from_pac_registers (const CORE_ADDR cmask, const CORE_ADDR dmask)
  86 {
  87   /* If the masks differ, default to using the one with the most coverage.  */
  88   if (dmask != cmask)
  89     return dmask > cmask ? dmask : cmask;
  90
  91   return cmask;
  92 }