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When there's a SIB byte, the register otherwise denoted by r/m will then be denoted by SIB.base REX.b will now extend this. SIB.index == SP is magic and notes an index value zero. This means that there's a bunch of alternative (longer) encodings for the same thing. Eg. 'ModRM.mod != 3, ModRM.r/m = AX' can be encoded as 'ModRM.mod != 3, ModRM.r/m = SP, SIB.base = AX, SIB.index = SP' which is actually 4 different encodings because the value of SIB.scale is irrelevant, giving rise to 5 different but equal encodings. Support these encodings and clean up the SIB handling in general. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lkml.kernel.org/r/20210211173627.472967498@infradead.org
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.