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/* Common Linux target-dependent functionality for AArch64 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-linux.h"
/* See arch/aarch64-mte-linux.h */
void
aarch64_mte_pack_tags (gdb::byte_vector &tags)
{
/* Nothing to pack? */
if (tags.empty ())
return;
/* If the tags vector has an odd number of elements, add another
zeroed-out element to make it even. This facilitates packing. */
if ((tags.size () % 2) != 0)
tags.emplace_back (0);
for (int unpacked = 0, packed = 0; unpacked < tags.size ();
unpacked += 2, packed++)
tags[packed] = (tags[unpacked + 1] << 4) | tags[unpacked];
/* Now we have half the size. */
tags.resize (tags.size () / 2);
}
/* See arch/aarch64-mte-linux.h */
void
aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first)
{
/* Nothing to unpack? */
if (tags.empty ())
return;
/* An unpacked MTE tags vector will have twice the number of elements
compared to an unpacked one. */
gdb::byte_vector unpacked_tags (tags.size () * 2);
int unpacked = 0, packed = 0;
if (skip_first)
{
/* We are not interested in the first unpacked element, just discard
it. */
unpacked_tags[unpacked] = (tags[packed] >> 4) & 0xf;
unpacked++;
packed++;
}
for (; packed < tags.size (); unpacked += 2, packed++)
{
unpacked_tags[unpacked] = tags[packed] & 0xf;
unpacked_tags[unpacked + 1] = (tags[packed] >> 4) & 0xf;
}
/* Update the original tags vector. */
tags = std::move (unpacked_tags);
}
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