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$FreeBSD$
This file contains the changes made to W. Metzenthem's 387 FPU
emulator to make it work under NetBSD.
a, Changes to make it compile:
1 - Changed the #include's to get the appropriate .h files.
2 - Renamed .S to .s, to satisfy the kernel Makefile.
3 - Changed the C++ style // comments to /* */
4 - Changed the FPU_ORIG_EIP macro. A letter from bde included
in the package suggested using tf_isp for using instead
of the linux __orig_eip. This later turned out to interfere
with the user stack, so i created a separate variable, stored
in the i387_union.
5 - Changed the get_fs_.. put_fs_.. fns to fubyte,fuword,subyte,
suword.
6 - Removed the verify_area fns. I don't really know what they do,
i suppose they verify access to memory. The sufu routines
should do this.
b, Changes to make it work:
1 - Made math_emulate() to return 0 when successful, so trap() won't
try to generate a signal.
2 - Changed the size of the save87 struct in /sys/arch/i387/include/
npx.h to accomodate the i387_union.
d, Other changes:
1 - Removed obsolate and/or linux specific stuff.
2 - Changed the RE_ENTRANT_CHECK_[ON|OFF] macro to
REENTRANT_CHECK([ON|OFF]) so indent can grok it.
3 - Re-indented to Berkeley style.
4 - Limited max no of lookaheads. LOOKAHEAD_LIMIT in fpu_entry.c
Szabolcs Szigeti (pink@fsz.bme.hu)
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