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The top of the stack always points to 'stack_base + stack_size'. But the stack pointer is decremented before writing to the stack. It means the top byte of the stack is actually 'stack_base + stack_size - 1'. The initialization should also decrement the stack pointer before zero'ing the memory (pre-indexed addressing). Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16518 6f19259b-4bc3-4df7-8a09-765794883524