Commit f27d6e17 authored by Will Deacon's avatar Will Deacon Committed by Russell King

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

Commit d3f79584 ("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: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 4ca46c5e
...@@ -60,7 +60,7 @@ ENTRY(vfp_testing_entry) ...@@ -60,7 +60,7 @@ ENTRY(vfp_testing_entry)
str r11, [r10, #TI_PREEMPT] str r11, [r10, #TI_PREEMPT]
#endif #endif
ldr r0, VFP_arch_address 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 mov pc, r9 @ we have handled the fault
ENDPROC(vfp_testing_entry) ENDPROC(vfp_testing_entry)
......
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