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ARM: 8195/1: vfp: Bounce undefined instructions in vectored mode

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Certain ARM CPU implementations (e.g. Cortex-A15) may not raise a
floating- point exception whenever deprecated short-vector VFP
instructions are executed. Instead these instructions are treated
as UNALLOCATED. Change the VFP exception handling code to emulate
short-vector instructions even if FPEXC exception bits are not
set.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Tested-by: Will Deacon <will.deacon@arm.com>
Tested-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Stepan Moskovchenko 2014-11-10 21:56:42 +01:00 • committed by Russell King
commit 1ca8bf6f7b
1 changed files with 6 additions and 0 deletions
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6
arch/arm/vfp/vfphw.S
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@ -197,6 +197,12 @@ look_for_VFP_exceptions:
tst r5, #FPSCR_IXE tst r5, #FPSCR_IXE
bne process_exception bne process_exception
tst r5, #FPSCR_LENGTH_MASK
beq skip
orr r1, r1, #FPEXC_DEX
b process_exception
skip:
@ Fall into hand on to next handler - appropriate coproc instr @ Fall into hand on to next handler - appropriate coproc instr
@ not recognised by VFP @ not recognised by VFP