[edk2-devel] [PATCH v2 0/5] MdePkg: various fixes to ARM/AArch64 SetJump/LongJump

["Leif Lindholm" <quic_llindhol@quicinc.com>]

Back in the mists of time (January 2020) I submitted a set to clean up
and fix a few bugs in ARM/AArch64 BaseLib SetJump/LongJump implementations:
https://edk2.groups.io/g/devel/message/65812

Then hubris struck and I meant to refactor the code for all architectures,
and since this was in my first week in a new job, that meant everything
got completely dropped on the floor.

Then Andrei's fix of similar issues for RiscV64 made me remember this set.
And I figured, let's dial back the ambition and get the actual fixes
merged.

The overall scope remains:
- Fix comments (drop Itanium mention, correct spelling)
- Make code match existing comments
- Don't try to optimise ARM for executing on the 8088
- Use the correct register sizes on AArch64
- Actually follow the API on ARM

And like the original submission, the changes to .asm files have been
neither build nor runtime tested.

Any acks/reviewed-bys have been dropped, it having been over 3.5 years.

Changes since v1:
- Rebased to current edk2 main.
- Incorporate Ard's feedback on maintaining a clean call stack for
  InternalAssertJumpBuffer, *and* conditionalising it on !MDEPKG_NDEBUG.
- Changed authorship to my current identity (the company I worked at
  during v1 having been acquired by my current employer, this feels
  like a reasonable course of action).

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Cc: Andrei Warkentin <andrei.warkentin@intel.com>

Leif Lindholm (5):
  MdePkg/BaseLib: fix comments in ARM* SetJump/LongJump implementations
  MdePkg/BaseLib: add ASSERT in ARM* SetJump implementations
  MdePkg/BaseLib: use normal register init in ARM SetJump
    implementations
  MdePkg/BaseLib: correct register sizes in AArch64 SetJump/LongJump
  MdePkg/BaseLib: ensure ARM LongJump never returns 0

 MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.S   | 19 +++++++++++++------
 MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.asm | 19 +++++++++++++------
 MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S       |  7 ++++---
 MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm     |  7 ++++---
 4 files changed, 34 insertions(+), 18 deletions(-)

-- 
2.30.2



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