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From: Matthew Dillon <dillon at apollo.backplane.com>
Subject: Re: Request for swapcontext and getcontext to be ported to our libc [ revision 3 ]
Date: Mon, 15 Jan 2007 23:19:48 -0800 (PST)
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:I revisited these two kernel files and agree partially with your assessment:
:- machdep.c fixed a missing linebreak; the other change (mc_len) was cruft.
:- ucontext.h contains the protos for the *context routines; they still need
:to be somewhere so autoconf can find them, and I felt that this was the best
:place for them.  The other stuff (uc_flags, UCF_SWAPPED) was cruft.
:
:--
:Matt Emmerton

    Ok, I restored those bits.

    I have implemented the assembly and done some other cleanups and a 
    bit of testing.  I am committing the completed work now.

    I have not yet implemented the floating point save/restore.  I will
    check save-used for FP registers and see if I can optimize what gets
    saved.  When switching occurs synchronously I don't think the FP regs
    need to be saved/restored unless the prorgam is compiled to use 
    FP regs and general regs so this may be good enough for the moment.

    Switching from a signal dispatch is more problematic.  That almost
    certainly requires FP save/restore.

    Now we need some comprehensive testing with packages that actually
    use this beast!

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>