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, granule_size);
  35
  36   /* We always have at least 1 granule.  */
  37   return 1 + (e_addr - s_addr) / granule_size;
  38 }
  39
  40 /* See arch/aarch64-mte-linux.h */
  41
  42 CORE_ADDR
  43 aarch64_mte_make_ltag_bits (CORE_ADDR value)
  44 {
  45   return value & AARCH64_MTE_LOGICAL_MAX_VALUE;
  46 }
  47
  48 /* See arch/aarch64-mte-linux.h */
  49
  50 CORE_ADDR
  51 aarch64_mte_make_ltag (CORE_ADDR value)
  52 {
  53   return (aarch64_mte_make_ltag_bits (value)
  54           << AARCH64_MTE_LOGICAL_TAG_START_BIT);
  55 }
  56
  57 /* See arch/aarch64-mte-linux.h */
  58
  59 CORE_ADDR
  60 aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag)
  61 {
  62   /* Remove the existing tag.  */
  63   address &= ~aarch64_mte_make_ltag (AARCH64_MTE_LOGICAL_MAX_VALUE);
  64
  65   /* Return the new tagged address.  */
  66   return address | aarch64_mte_make_ltag (tag);
  67 }
  68
  69 /* See arch/aarch64-mte-linux.h */
  70
  71 CORE_ADDR
  72 aarch64_mte_get_ltag (CORE_ADDR address)
  73 {
  74   CORE_ADDR ltag_addr = address >> AARCH64_MTE_LOGICAL_TAG_START_BIT;
  75   return aarch64_mte_make_ltag_bits (ltag_addr);
  76 }