MIPS: Always clear FCSR cause bits after emulation
authorMaciej W. Rozycki <macro@linux-mips.org>
Fri, 3 Apr 2015 22:27:10 +0000 (23:27 +0100)
committerRalf Baechle <ralf@linux-mips.org>
Tue, 7 Apr 2015 23:10:17 +0000 (01:10 +0200)
commit443c44032a54f9acf027a8e688380fddc809bc19
tree482d477dc139c712bec7f79212408c46e5e79409
parented2d72c1eb3643b7c109bdf387563d9b9a30c279
MIPS: Always clear FCSR cause bits after emulation

Clear any FCSR cause bits recorded in the saved FPU context after
emulation in all cases rather than in `do_fpe' only, so that any
unmasked IEEE 754 exception left from emulation does not cause a fatal
kernel-mode FPE hardware exception with the CTC1 instruction used by the
kernel to subsequently restore FCSR hardware from the saved FPU context.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9704/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/kernel/mips-r2-to-r6-emul.c
arch/mips/kernel/traps.c