MIPS: Always clear FCSR cause bits after emulation

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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>

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Maciej W. Rozycki 2015-04-03 23:27:10 +01:00 • committed by Ralf Baechle

parent ed2d72c1eb

commit 443c44032a

2 changed files with 20 additions and 1 deletions

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6

arch/mips/kernel/mips-r2-to-r6-emul.c

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15

arch/mips/kernel/traps.c

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