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0746f49b1d
When we want to fetch tags from a memory range, the last address in that range is not included. There is a off-by-one error in aarch64_mte_get_tag_granules, which this patch fixes. gdb/ChangeLog: 2021-05-13 Luis Machado <luis.machado@linaro.org> * arch/aarch64-mte-linux.c (aarch64_mte_get_tag_granules): Don't include the last address in the range.
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* Common Linux target-dependent functionality for AArch64 MTE
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Copyright (C) 2021 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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size_t
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aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len, size_t granule_size)
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{
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/* An empty range has 0 tag granules. */
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if (len == 0)
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return 0;
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/* Start address */
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CORE_ADDR s_addr = align_down (addr, granule_size);
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/* End address */
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CORE_ADDR e_addr = align_down (addr + len - 1, granule_size);
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/* We always have at least 1 granule because len is non-zero at this
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point. */
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return 1 + (e_addr - s_addr) / granule_size;
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}
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/* See arch/aarch64-mte-linux.h */
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CORE_ADDR
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aarch64_mte_make_ltag_bits (CORE_ADDR value)
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{
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return value & AARCH64_MTE_LOGICAL_MAX_VALUE;
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}
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/* See arch/aarch64-mte-linux.h */
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CORE_ADDR
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aarch64_mte_make_ltag (CORE_ADDR value)
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{
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return (aarch64_mte_make_ltag_bits (value)
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<< AARCH64_MTE_LOGICAL_TAG_START_BIT);
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}
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/* See arch/aarch64-mte-linux.h */
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CORE_ADDR
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aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag)
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{
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/* Remove the existing tag. */
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address &= ~aarch64_mte_make_ltag (AARCH64_MTE_LOGICAL_MAX_VALUE);
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/* Return the new tagged address. */
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return address | aarch64_mte_make_ltag (tag);
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}
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/* See arch/aarch64-mte-linux.h */
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CORE_ADDR
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aarch64_mte_get_ltag (CORE_ADDR address)
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{
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CORE_ADDR ltag_addr = address >> AARCH64_MTE_LOGICAL_TAG_START_BIT;
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return aarch64_mte_make_ltag_bits (ltag_addr);
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}
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