[Feature]: Support Host-Based Unit Tests on AArch64 platforms

[sachinami]

Feature Overview

Host-based unit tests are supported on both Windows and Linux environments; however, the current implementation is limited to x64 architecture and would cause build breaks in AArch64 platforms.

Extend support to include AArch64 platforms to enable broader test coverage and platform validation.

Solution Overview

There was an earlier effort to enable this in #495.

Changes were made by @kuqin12 to port the Cmocka framework : https://github.com/kuqin12/mu_basecore/commits/unit_test_arm64/

But it did not go through. These changes can be revisited.

Alternatives Considered

No response

Urgency

High

Are you going to implement the feature request?

Someone else needs to implement the feature

Do you need maintainer feedback?

Maintainer feedback requested

Anything else?

No response

[sachinami]

CC: @apop5 @makubacki

[kuqin12]

@sachinami the original proposal was closed because everyone was trying to move to google test back then. Whereas the google test in edk2 relies on subhook submodule, which is specifically written for x64. But we do not have the same issue with cmocka.

Is this request for cmocka only? or both google test and cmocka?

[sachinami]

@sachinami the original proposal was closed because everyone was trying to move to google test back then. Whereas the google test in edk2 relies on subhook submodule, which is specifically written for x64. But we do not have the same issue with cmocka.

Is this request for cmocka only? or both google test and cmocka?

@kuqin12 This request is for both Cmocka and Google Tests.

[kuqin12]

@sachinami I see. In that sense, the subhook dependency will be the most immediate issue we need to address. We could take one of the 3 paths:

1. not support function pointer patching for Google test
2. implement the aarch64 support for subhook
3. find a substitute of subhook that can support both

I will discuss this with the team internally and see how we want to proceed.

[sachinami]

@kuqin12

Appreciate your support.

Meanwhile, if you have a working version of your earlier changes to support Cmocka on AArch64.
Could we rebase that and introduce it into UnitTestFramworkPkg.

[kuqin12]

@sachinami We synced internally on this topic on Friday. The feedback is that google test support for AArch64 is not our top priority for now. But I will spend some cycles on cmocka support so that mu_basecore can have it.