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956856dd11
Add load-acquire ("load_acq", LDAR{,B,H}) and store-release
("store_rel", STLR{,B,H}) instructions. Breakdown of encoding:
size L (Rs) o0 (Rt2) Rn Rt
mask (0x3fdffc00): 00 111111 1 1 0 11111 1 11111 00000 00000
value, load_acq (0x08dffc00): 00 001000 1 1 0 11111 1 11111 00000 00000
value, store_rel (0x089ffc00): 00 001000 1 0 0 11111 1 11111 00000 00000
As suggested by Xu [1], include all Should-Be-One (SBO) bits ("Rs" and
"Rt2" fields) in the "mask" and "value" numbers.
It is worth noting that we are adding the "no offset" variant of STLR
instead of the "pre-index" variant, which has a different encoding.
Reference: Arm Architecture Reference Manual (ARM DDI 0487K.a,
ID032224),
* C6.2.161 LDAR
* C6.2.353 STLR
[1] https://lore.kernel.org/bpf/4e6641ce-3f1e-4251-8daf-4dd4b77d08c4@huaweicloud.com/
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Peilin Ye <yepeilin@google.com>
Link: https://lore.kernel.org/r/ba92057b7502ce4c9c9b03b7d637abe5e178134e.1741049567.git.yepeilin@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.