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Intel Flexible Return and Event Delivery (FRED) adds instructions ERETS (return to supervisor) and ERETU (return to user). Intel PT instruction decoder needs to know about these instructions because they are branch instructions. Similar to IRET instructions, when the decoder encounters one of these instructions it will match it to a TIP (target instruction pointer) packet that informs what the branch destination is. The existing "x86 instruction decoder - new instructions" test can be used to test the result e.g. $ perf test -v ins |& grep eret Decoded ok: f2 0f 01 ca erets Decoded ok: f3 0f 01 ca eretu Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20230320183517.15099-2-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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.