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MRS emulation gets triggered with exception class (0x00 or 0x18) eventually calling the function emulate_mrs() which fetches the user space instruction and analyses it's encodings (OP0, OP1, OP2, CRN, CRM, RT). The kernel tries to emulate the given instruction looking into the encoding details. Going forward these encodings can also be parsed from ESR_ELx.ISS fields without requiring to fetch/decode faulting userspace instruction which can improve performance. This factorizes emulate_mrs() function in a way that it can be called directly with MRS encodings (OP0, OP1, OP2, CRN, CRM) for any given target register which can then be used directly from 0x18 exception class. Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.