Commit Graph

4 Commits

Author SHA1 Message Date
Liu Yu 6a800f36ac powerpc: Add SPE/EFP math emulation for E500v1/v2 processors.
This patch add the handlers of SPE/EFP exceptions.
The code is used to emulate float point arithmetic,
when MSR(SPE) is enabled and receive EFP data interrupt or EFP round interrupt.

This patch has no conflict with or dependence on FP math-emu.

The code has been tested by TestFloat.

Now the code doesn't support SPE/EFP instructions emulation
(it won't be called when receive program interrupt),
but it could be easily added.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-12-03 08:19:16 -06:00
Liu Yu 463a8c01e1 powerpc/math-emu: Adopt new version of _FP_CHOOSENAN
Move to using the same macro definition for _FP_CHOOSENAN as s390,
sh, sparc32/64.  The original author didn't understand this and
matched what sparc64 was doing and they have updated to this definition.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-12-03 08:19:14 -06:00
Liu Yu cf03033658 powerpc/math-emu: Fix single float point division bug
PowerPC float point division emulation is derived from gcc.
I reported this problem on gcc maillist and got this reply:
http://gcc.gnu.org/ml/gcc/2008-03/msg00543.html

Since UDIV_NEEDS_NORMALIZATION is not used by kernel, we should use
_FP_DIV_MEAT_1_udiv_norm to make sure the single float point
is normalized before udiv_qrnnd.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-12-03 08:19:12 -06:00
Kumar Gala d2b194ed82 powerpc/math-emu: Use kernel generic math-emu code
The math emulation code is centered around a set of generic macros that
provide the core of the emulation that are shared by the various
architectures and other projects (like glibc).  Each arch implements its
own sfp-machine.h to specific various arch specific details.

For historic reasons that are now lost the powerpc math-emu code had
its own version of the common headers.  This moves us to using the
kernel generic version and thus getting fixes when those are updated.

Also cleaned up exception/error reporting from the FP emulation functions.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-10-01 08:40:07 -05:00