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authorWill Deacon <will.deacon@arm.com>2013-05-16 19:38:51 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-05-22 22:01:37 +0100
commitf27d6e172367a424ecf9d373062a820338671277 (patch)
tree1b1db576a240cd34293a7de07e1e480715056c84 /arch/arm
parent4ca46c5e1f38e32c90247686e9e17dae213ecbdb (diff)
downloadvexpress-lsk-f27d6e172367a424ecf9d373062a820338671277.tar.gz
ARM: 7729/1: vfp: ensure VFP_arch is non-zero when VFP is not supported
Commit d3f79584a8b5 ("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>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/vfp/entry.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S
index 323ce1a62bb..46e17492fd1 100644
--- a/arch/arm/vfp/entry.S
+++ b/arch/arm/vfp/entry.S
@@ -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)