The AARCH64 LDR and STR instructions only support signed offsets for post- and pre-indexed addressing. For normal signed offset addressing, the mnemonic is STUR. GNU As automatically assembles STR with signed offset as STUR, but Clang's integrated assembler doesn't. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Brendan Jackman <brendan.jackman@arm.com> Reviewed-by: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15508 6f19259b-4bc3-4df7-8a09-765794883524