gdb/arch/aarch64-mte-linux.c

   1 /* Common Linux target-dependent functionality for AArch64 MTE
   2
   3    Copyright (C) 2021 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 #include "arch/aarch64-mte-linux.h"
  21
  22 /* See arch/aarch64-mte-linux.h */
  23
  24 size_t
  25 aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len, size_t granule_size)
  26 {
  27   /* An empty range has 0 tag granules.  */
  28   if (len == 0)
  29     return 0;
  30
  31   /* Start address */
  32   CORE_ADDR s_addr = align_down (addr, granule_size);
  33   /* End address */
  34   CORE_ADDR e_addr = align_down (addr + len - 1, granule_size);
  35
  36   /* We always have at least 1 granule because len is non-zero at this
  37      point.  */
  38   return 1 + (e_addr - s_addr) / granule_size;
  39 }
  40
  41 /* See arch/aarch64-mte-linux.h */
  42
  43 CORE_ADDR
  44 aarch64_mte_make_ltag_bits (CORE_ADDR value)
  45 {
  46   return value & AARCH64_MTE_LOGICAL_MAX_VALUE;
  47 }
  48
  49 /* See arch/aarch64-mte-linux.h */
  50
  51 CORE_ADDR
  52 aarch64_mte_make_ltag (CORE_ADDR value)
  53 {
  54   return (aarch64_mte_make_ltag_bits (value)
  55           << AARCH64_MTE_LOGICAL_TAG_START_BIT);
  56 }
  57
  58 /* See arch/aarch64-mte-linux.h */
  59
  60 CORE_ADDR
  61 aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag)
  62 {
  63   /* Remove the existing tag.  */
  64   address &= ~aarch64_mte_make_ltag (AARCH64_MTE_LOGICAL_MAX_VALUE);
  65
  66   /* Return the new tagged address.  */
  67   return address | aarch64_mte_make_ltag (tag);
  68 }
  69
  70 /* See arch/aarch64-mte-linux.h */
  71
  72 CORE_ADDR
  73 aarch64_mte_get_ltag (CORE_ADDR address)
  74 {
  75   CORE_ADDR ltag_addr = address >> AARCH64_MTE_LOGICAL_TAG_START_BIT;
  76   return aarch64_mte_make_ltag_bits (ltag_addr);
  77 }