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

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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>
This commit is contained in:
Seth Forshee 2009-03-02 22:39:36 +01:00 committed by Russell King
parent c8532db7f2
commit 25ef4a67e7
1 changed files with 2 additions and 1 deletions
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3
arch/arm/mm/abort-ev6.S
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@ -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