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Teach GDB how to dump memory tags for AArch64 when using the gcore command and how to read memory tag data back from a core file generated by GDB (via gcore) or by the Linux kernel. The format is documented in the Linux Kernel documentation [1]. Each tagged memory range (listed in /proc/<pid>/smaps) gets dumped to its own PT_AARCH64_MEMTAG_MTE segment. A section named ".memtag" is created for each of those segments when reading the core file back. To save a little bit of space, given MTE tags only take 4 bits, the memory tags are stored packed as 2 tags per byte. When reading the data back, the tags are unpacked. I've added a new testcase to exercise the feature. Build-tested with --enable-targets=all and regression tested on aarch64-linux Ubuntu 20.04. [1] Documentation/arm64/memory-tagging-extension.rst (Core Dump Support)
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/* Common Linux target-dependent definitions for AArch64 MTE
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Copyright (C) 2021-2022 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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#ifndef ARCH_AARCH64_MTE_LINUX_H
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#define ARCH_AARCH64_MTE_LINUX_H
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#include "gdbsupport/common-defs.h"
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/* Feature check for Memory Tagging Extension. */
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#ifndef HWCAP2_MTE
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#define HWCAP2_MTE (1 << 18)
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#endif
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/* The MTE regset consists of a single 64-bit register. */
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#define AARCH64_LINUX_SIZEOF_MTE 8
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/* We have one tag per 16 bytes of memory. */
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#define AARCH64_MTE_GRANULE_SIZE 16
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#define AARCH64_MTE_TAG_BIT_SIZE 4
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#define AARCH64_MTE_LOGICAL_TAG_START_BIT 56
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#define AARCH64_MTE_LOGICAL_MAX_VALUE 0xf
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/* Memory tagging definitions. */
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#ifndef SEGV_MTEAERR
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# define SEGV_MTEAERR 8
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# define SEGV_MTESERR 9
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#endif
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/* Memory tag types for AArch64. */
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enum class aarch64_memtag_type
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{
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/* MTE logical tag contained in pointers. */
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mte_logical = 0,
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/* MTE allocation tag stored in memory tag granules. */
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mte_allocation
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};
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/* Return the number of tag granules in the memory range
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[ADDR, ADDR + LEN) given GRANULE_SIZE. */
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extern size_t aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len,
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size_t granule_size);
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/* Return the 4-bit tag made from VALUE. */
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extern CORE_ADDR aarch64_mte_make_ltag_bits (CORE_ADDR value);
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/* Return the 4-bit tag that can be OR-ed to an address. */
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extern CORE_ADDR aarch64_mte_make_ltag (CORE_ADDR value);
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/* Helper to set the logical TAG for a 64-bit ADDRESS.
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It is always possible to set the logical tag. */
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extern CORE_ADDR aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag);
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/* Helper to get the logical tag from a 64-bit ADDRESS.
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It is always possible to get the logical tag. */
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extern CORE_ADDR aarch64_mte_get_ltag (CORE_ADDR address);
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/* Given a TAGS vector containing 1 MTE tag per byte, pack the data as
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2 tags per byte and resize the vector. */
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extern void aarch64_mte_pack_tags (gdb::byte_vector &tags);
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/* Given a TAGS vector containing 2 MTE tags per byte, unpack the data as
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1 tag per byte and resize the vector. If SKIP_FIRST is TRUE, skip the
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first unpacked element. Otherwise leave it in the unpacked vector. */
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extern void aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first);
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#endif /* ARCH_AARCH64_MTE_LINUX_H */
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