This commit is the result of running the gdb/copyright.py script,
which automated the update of the copyright year range for all
source files managed by the GDB project to be updated to include
year 2023.
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)
This commit brings all the changes made by running gdb/copyright.py
as per GDB's Start of New Year Procedure.
For the avoidance of doubt, all changes in this commits were
performed by the script.
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.
The patch implements the memory tagging target hooks for AArch64, so we
can handle MTE.
gdb/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* Makefile.in (ALL_64_TARGET_OBS): Add arch/aarch64-mte-linux.o.
(HFILES_NO_SRCDIR): Add arch/aarch64-mte-linux.h and
nat/aarch64-mte-linux-ptrace.h.
* aarch64-linux-nat.c: Include nat/aarch64-mte-linux-ptrace.h.
(aarch64_linux_nat_target) <supports_memory_tagging>: New method
override.
<fetch_memtags>: New method override.
<store_memtags>: New method override.
(aarch64_linux_nat_target::supports_memory_tagging): New method.
(aarch64_linux_nat_target::fetch_memtags): New method.
(aarch64_linux_nat_target::store_memtags): New method.
* arch/aarch64-mte-linux.c: New file.
* arch/aarch64-mte-linux.h: Include gdbsupport/common-defs.h.
(AARCH64_MTE_GRANULE_SIZE): Define.
(aarch64_memtag_type): New enum.
(aarch64_mte_get_tag_granules): New prototype.
* configure.nat (NATDEPFILES): Add nat/aarch64-mte-linux-ptrace.o.
* configure.tgt (aarch64*-*-linux*): Add arch/aarch64-mte-linux.o.
* nat/aarch64-mte-linux-ptrace.c: New file.
* nat/aarch64-mte-linux-ptrace.h: New file.
