path: root/arch/arm/include/asm
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authorWill Deacon <will.deacon@arm.com>2012-05-15 15:51:54 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-05-17 14:48:56 +0100
commit56cb248428ead13a6b423ed3f3cf9e4aa01244b1 (patch)
treebd1ab001b446712e5741220d80ce8c877b9e6482 /arch/arm/include/asm
parent1a3abcf41f13666d4ed241c8cc7f48bd38e7b543 (diff)
ARM: 7419/1: vfp: fix VFP flushing regression on sigreturn path
Commit ff9a184c ("ARM: 7400/1: vfp: clear fpscr length and stride bits on entry to sig handler") flushes the VFP state prior to entering a signal handler so that a VFP operation inside the handler will trap and force a restore of ABI-compliant registers. Reflushing and disabling VFP on the sigreturn path is predicated on the saved thread state indicating that VFP was used by the handler -- however for SMP platforms this is only set on context-switch, making the check unreliable and causing VFP register corruption in userspace since the register values are not necessarily those restored from the sigframe. This patch unconditionally flushes the VFP state after a signal handler. Since we already perform the flush before the handler and the flushing itself happens lazily, the redundant flush when VFP is not used by the handler is essentially a nop. Reported-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm')
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