gdb: AArch64: Support MTE on baremetal

This commit moves aarch64_linux_memtag_matches_p,
aarch64_linux_set_memtags, aarch64_linux_get_memtag, and
aarch64_linux_memtag_to_string hooks (plus the aarch64_mte_get_atag
function used by them), along with the setting of the memtag granule
size, from aarch64-linux-tdep.c to aarch64-tdep.c, making MTE available
on baremetal targets. Since the aarch64-linux-tdep.c layer inherits
these hooks from aarch64-tdep.c, there is no effective change for
aarch64-linux targets.

Helpers used both by aarch64-tdep.c and by aarch64-linux-tdep.c were
moved from arch/aarch64-mte-linux.{c,h} to new arch/aarch64-mte.{c,h}
files.

Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Tested-By: Luis Machado <luis.machado@arm.com>
Approved-By: Luis Machado <luis.machado@arm.com>
Reviewed-By: Eli Zaretskii <eliz@gnu.org>

1 files changed, 77 insertions, 0 deletions

diff --git a/gdb/arch/aarch64-mte.c b/gdb/arch/aarch64-mte.c
new file mode 100644
index 0000000..908e12c
--- /dev/null
+++ b/gdb/arch/aarch64-mte.c
@@ -0,0 +1,77 @@
+/* Common AArch64 functionality for MTE
+
+   Copyright (C) 2021-2024 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "arch/aarch64-mte.h"
+
+/* See arch/aarch64-mte.h */
+
+size_t
+aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len, size_t granule_size)
+{
+  /* An empty range has 0 tag granules.  */
+  if (len == 0)
+    return 0;
+
+  /* Start address */
+  CORE_ADDR s_addr = align_down (addr, granule_size);
+  /* End address */
+  CORE_ADDR e_addr = align_down (addr + len - 1, granule_size);
+
+  /* We always have at least 1 granule because len is non-zero at this
+     point.  */
+  return 1 + (e_addr - s_addr) / granule_size;
+}
+
+/* See arch/aarch64-mte.h */
+
+CORE_ADDR
+aarch64_mte_make_ltag_bits (CORE_ADDR value)
+{
+  return value & AARCH64_MTE_LOGICAL_MAX_VALUE;
+}
+
+/* See arch/aarch64-mte.h */
+
+CORE_ADDR
+aarch64_mte_make_ltag (CORE_ADDR value)
+{
+  return (aarch64_mte_make_ltag_bits (value)
+	  << AARCH64_MTE_LOGICAL_TAG_START_BIT);
+}
+
+/* See arch/aarch64-mte.h */
+
+CORE_ADDR
+aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag)
+{
+  /* Remove the existing tag.  */
+  address &= ~aarch64_mte_make_ltag (AARCH64_MTE_LOGICAL_MAX_VALUE);
+
+  /* Return the new tagged address.  */
+  return address | aarch64_mte_make_ltag (tag);
+}
+
+/* See arch/aarch64-mte.h */
+
+CORE_ADDR
+aarch64_mte_get_ltag (CORE_ADDR address)
+{
+  CORE_ADDR ltag_addr = address >> AARCH64_MTE_LOGICAL_TAG_START_BIT;
+  return aarch64_mte_make_ltag_bits (ltag_addr);
+}