Commit 25ef4a67 authored Mar 02, 2009 by Seth Forshee Committed by Russell King Mar 03, 2009

[ARM] 5416/1: Use unused address in v6_early_abort



The target of the strex instruction to clear the exlusive monitor
is currently the top of the stack.  If the store succeeeds this
corrupts r0 in pt_regs.  Use the next stack location instead of
the current one to prevent any chance of corrupting an in-use
address.

Signed-off-by: Seth Forshee <seth.forshee@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent c8532db7

arch/arm/mm/abort-ev6.S

+2 −1

Original line number	Diff line number	Diff line
		@@ -23,7 +23,8 @@ ENTRY(v6_early_abort)
		#ifdef CONFIG_CPU_32v6K
		clrex
		#else
		strex r0, r1, [sp] @ Clear the exclusive monitor
		sub r1, sp, #4 @ Get unused stack location
		strex r0, r1, [r1] @ Clear the exclusive monitor
		#endif
		mrc p15, 0, r1, c5, c0, 0 @ get FSR
		mrc p15, 0, r0, c6, c0, 0 @ get FAR