derek.holloway
7502bf64a4
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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Common Linux target-dependent functionality for AArch64 MTE
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Copyright (C) 2021-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "arch/aarch64-mte-linux.h"
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/* See arch/aarch64-mte-linux.h */
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void
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aarch64_mte_pack_tags (gdb::byte_vector &tags)
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{
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/* Nothing to pack? */
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if (tags.empty ())
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return;
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/* If the tags vector has an odd number of elements, add another
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zeroed-out element to make it even. This facilitates packing. */
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if ((tags.size () % 2) != 0)
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tags.emplace_back (0);
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for (int unpacked = 0, packed = 0; unpacked < tags.size ();
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unpacked += 2, packed++)
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tags[packed] = (tags[unpacked + 1] << 4) | tags[unpacked];
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/* Now we have half the size. */
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tags.resize (tags.size () / 2);
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}
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/* See arch/aarch64-mte-linux.h */
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void
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aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first)
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{
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/* Nothing to unpack? */
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if (tags.empty ())
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return;
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/* An unpacked MTE tags vector will have twice the number of elements
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compared to an unpacked one. */
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gdb::byte_vector unpacked_tags (tags.size () * 2);
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int unpacked = 0, packed = 0;
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if (skip_first)
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{
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/* We are not interested in the first unpacked element, just discard
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it. */
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unpacked_tags[unpacked] = (tags[packed] >> 4) & 0xf;
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unpacked++;
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packed++;
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}
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for (; packed < tags.size (); unpacked += 2, packed++)
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{
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unpacked_tags[unpacked] = tags[packed] & 0xf;
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unpacked_tags[unpacked + 1] = (tags[packed] >> 4) & 0xf;
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}
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/* Update the original tags vector. */
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tags = std::move (unpacked_tags);
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}
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