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ARM: 7729/1: vfp: ensure VFP_arch is non-zero when VFP is not supported

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Commit d3f79584a8 ("ARM: cleanup undefined instruction entry code")
improved the register scheduling when handling undefined instructions.
A side effect of this is that r5 is now used as a temporary, whilst the
VFP probing code relies on r5 containing a non-zero value when VFP is
not supported.

This patch fixes the VFP detection code so that we don't rely on the
contents of r5. Without this patch, Linux dies loudly on CPUs without
VFP support.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2013-05-16 19:38:51 +01:00 committed by Russell King
parent 4ca46c5e1f
commit f27d6e1723
1 changed files with 1 additions and 1 deletions
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2
arch/arm/vfp/entry.S
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@ -60,7 +60,7 @@ ENTRY(vfp_testing_entry)
str r11, [r10, #TI_PREEMPT]
#endif
ldr r0, VFP_arch_address
str r5, [r0] @ known non-zero value
str r0, [r0] @ set to non-zero value
mov pc, r9 @ we have handled the fault
ENDPROC(vfp_testing_entry)