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On performing a BPF-to-BPF call, we first jump to a subroutine that pushes callee-saved registers (R6~R9) to the stack, and from there we goes to the start of the callee next. In order to do so, the caller must pass to the subroutine the address of the NFP instruction to jump to at the end of that subroutine. This cannot be reliably implemented when translated the caller, as we do not always know the start offset of the callee yet. This patch implement the required fixup step for passing the start offset in the callee via the register used by the subroutine to hold its return address. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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.