tree f11f24220dc80f987b80e6db712b8dd238a97867
parent 9370450493f1d80484e71a4dfac403db4c55d4c9
author David Brazdil <dbrazdil@google.com> 1571921750 +0100
committer David Brazdil <dbrazdil@google.com> 1572450647 +0000

Auto-generate header of struct offsets/sizes

Code written in assembly needs to be told the offsets of struct members.
Currently these are hardcoded and static_assert-ed at compile time,
requiring manual updates every time struct declarations change.
This patch adds a mechanism for auto-generating a header with these
constants.

It uses a "hack" similar to other projects, e.g. Linux, where the
integer constant is used as an immediate in an inline assembly block.
The file is compiled and the constant extracted by a script which
generates the header file. For easy grep-ing, the constant is compiled
into a '.ascii' string, surrounded by magic strings, and extracted using
the 'strings' binutils tool.

To guarantee correctness, the same source file is compiled again as part
of the Hafnium binary but this time the declarations are converted to
static_asserts which check the values.

Fix: 120137356
Test: ./kokoru/ubuntu/build.sh
Change-Id: I551126519675e73cb01b4beb4ff9b1200b9b3de7