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d09ee410a3
Currently our ABI documentation says that the state of the bits in the Z registers not shared with the V registers becomes undefined on syscall but our actual implementation unconditionally clears these bits. Taking advantage of the flexibility of our documented ABI would be a change in the observable ABI so there is concern around doing so, instead document the actual behaviour so that it is more discoverable for userspace programmers who might be able to take advantage of it and to record our decision about not changing the kernel ABI. This makes qemu's user mode implementation buggy since it does not clear these bits. Signed-off-by: Mark Brown <broonie@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20220829162502.886816-3-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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 Restructured Text 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.