Things to do in the Apout Emulator
		    ----------------------------------

Ensure stream buffering works!

	Do some decent testing and code reading to make me happier.

Speed Apout up

	The biggest bottlenecks are the effective address calculations
	in ea.c. After compiling 2.11BSD /sys/GENERIC kernel with a
	gprof'd apout, we get:

	  %   cumulative   self              self     total           
 	time   seconds   seconds    calls  ms/call  ms/call  name    
       64.9       3.64     3.64                             .mcount (123)
  	6.1       3.99     0.34  1609635     0.00     0.00  load_src [5]
  	5.6       4.30     0.31  1665976     0.00     0.00  mov [4]
  	5.3       4.60     0.30        2   148.44   959.47  run <cycle 1> [3]
  	3.4       4.79     0.19  1238127     0.00     0.00  load_dst [7]
  	2.2       4.91     0.12   602275     0.00     0.00  store_dst [10]
  	1.3       4.98     0.08   374121     0.00     0.00  loadb_src [12]
  	1.3       5.05     0.07   672481     0.00     0.00  store_dst_2 [13]
  	1.2       5.12     0.07   365911     0.00     0.00  cmp [6]
  	1.1       5.18     0.06   323386     0.00     0.00  movb [8]
  	1.1       5.24     0.06   515335     0.00     0.00  bne [15]

	Everything else is below 1%. It doesn't look like there is
	much room for improvement, maybe 10% worth?

	We could go to having 65,536 separate functions, one for
	each possible instruction. That would mean a large reorganisation
	of the source, and would result in a significantly larger
	binary for apout.

	I've broken open some of the mov() functions which has improved
	things a few percent. I did expand itab[] to 64K entries, but
	the improvement was negligible. However, I should come back &
	revisit this sometime.

	Would it be worth adding STREAM_BUFFERING into bsdtrap.c? Possibly.
	After a GENERIC kernel compile, I found that reads averaged 580
	chars/read, writes averaged 115 chars/write. However, after getting
	buffering to work in bsdtrap.c, I found that it actually slowed down
	the GENERIC kernel compile, so I've left the code in but disabled it.

Finish off 2.11BSD emulation

	Finish off all the missing syscalls. This means I will have to
	learn how the new signal stuff actually works. Emulating signals
	is going to be really interesting, I can see!
	
	Enumerate and write all of the ioctls: yucko. That means all of
	the terminal stuff, blah!

Fix up the floating-point

	If the UNIX binaries never use the FP error handling, then don't
	bother to implement it. We should, however, implement doubles.
	We should spend some time to ensure that the FP operations are
	accurate, both in terms of FP accuracy, and in giving results
	as if they were on a real PDP-11.

Make it work on big-endian machines

	This would cause a lot of heartache in the code. It's not that
	pretty now, but can you imagine the #ifdefs once big-endian
	support is added? I guess some well-written macros could help.

Tidy up the code

	In particular, aout.c is a mess. Should be more modular.