BMC/Intel-BMC/linux.git/arch/mips/math-emu/dsemul.c, branch dev

MIPS: math-emu: Correct delay-slot exception propagation

2015-04-07T23:10:09+00:00

Restore EPC at the branch whose delay slot is emulated if the delay-slot instruction signals. This is so that code in `fpu_emulator_cop1Handler' does not see EPC having advanced and mistakenly successfully resume userland execution from the location at the branch target in that case. Restoring EPC guarantees an immediate exit from the emulation loop and if EPC hasn't advanced at all since entering the loop, also issuing the signal reported by the delay-slot instruction. Signed-off-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9701/ Signed-off-by: Ralf Baechle

MIPS: math-emu: Fix delay-slot emulation cache incoherency

2015-04-07T23:10:00+00:00

Correct a cache coherency regression introduced with be1664c4 [Another round of fixes for the fp emulator.] for the emulation frame used in delay-slot emulation. Two instructions are copied into the frame and as from the commit referred a cache synchronisation call is made for the second instruction aka `badinst' of the two only. The `flush_cache_sigtramp' interface is reused that guarantees that synchronisation will be made for 8 bytes or 2 instructions starting from the address requested, although if cache lines are wider then a larger area may be synchronised. Change the call to point to the first of the two instructions aka `emul' instead, removing unpredictable behaviour resulting from cache incoherency. This bug only ever manifested itself on systems implementing 4-byte cache lines, typically MIPS I systems, causing all kinds of weirdness. This is because the sequence of two instructions starting from `emul' is 8-byte aligned and for 8-byte or wider cache lines the line synchronised will span both, so the vast majority of systems have escaped unharmed. Signed-off-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9698/ Signed-off-by: Ralf Baechle

MIPS: Add FPU emulator counter for emulated delay slots.

2015-04-01T15:21:57+00:00

Delay slot emulation in the FPU emulator is the only kernel user of an executable stack, it is also very slow. Add a counter so we can see how many of these emulations are done. Signed-off-by: David Daney Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8634/ Signed-off-by: Ralf Baechle

MIPS: math-emu: Convert debug printks to pr_debug getting.

2014-05-23T13:11:04+00:00

And another bunch of #ifdefs bite the dust. Signed-off-by: Ralf Baechle

MIPS: math-emu: Remove fine example of cargo cult programming.

2014-05-21T09:12:54+00:00

Signed-off-by: Ralf Baechle

MIPS: math-emu: Header file weeding.

2014-05-21T09:12:53+00:00

Signed-off-by: Ralf Baechle

MIPS: math-emu: Use helpers to manipulate CAUSEF_BD flag.

2014-05-21T09:12:51+00:00

Signed-off-by: Ralf Baechle

MIPS: microMIPS: Floating point support.

2013-05-09T15:55:18+00:00

Add logic needed to do floating point emulation in microMIPS mode. Signed-off-by: Leonid Yegoshin Signed-off-by: Steven J. Hill

Disintegrate asm/system.h for MIPS

2012-03-28T17:30:02+00:00

Disintegrate asm/system.h for MIPS. Signed-off-by: David Howells Acked-by: Ralf Baechle cc: linux-mips@linux-mips.org

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi