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/* Common Linux target-dependent functionality for AArch64 MTE
Copyright (C) 2021 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 */
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-linux.h */
CORE_ADDR
aarch64_mte_make_ltag_bits (CORE_ADDR value)
{
return value & AARCH64_MTE_LOGICAL_MAX_VALUE;
}
/* See arch/aarch64-mte-linux.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-linux.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-linux.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);
}
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