/[gxemul]/upstream/0.4.6/TODO
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Revision 43 - (show annotations)
Mon Oct 8 16:22:43 2007 UTC (16 years, 5 months ago) by dpavlin
File size: 24772 byte(s)
0.4.6
1 $Id: TODO,v 1.536 2007/06/15 22:30:17 debug Exp $
2
3 Some things, in no specific order, that I'd like to fix:
4 (Some items in this list are perhaps already fixed.)
5
6 M88K:
7 o) Neither NIP nor FIP valid in rte?
8 o) FIP != NIP + 4, in rte! (Simulate delayed branch stuff.)
9 o) cpu_dyntrans.c: MEMORY_USER_ACCESS implementation for M88K!
10 o) xmem: Set transaction registers!
11 o) CMMUs:
12 o) Translation invalidations, could be optimized.
13 o) Move initialization from dev_mvme187 to somewhere
14 more reasonable?
15 o) Instruction trace by using bits of ??IP control regs.
16 o) Interrupts (these are machine dependent, though).
17 o) Implement devices etc. for one or more machine modes,
18 to get some guest OS running. OpenBSD/mvme88k on MVME187
19 seems to be the smartest path to follow for now.
20 o) VME bus device
21 o) PCC2
22 o) Cirrus Logic serial port controller
23 o) Instruction disassembly, and implementation:
24 o) See http://www.panggih.staff.ugm.ac.id/download/GCC/info/gcc.i5
25 for some strange cases of when "div" can fail (?)
26 o) Floating point stuff
27 o) "Graphics" instructions (M88110-specific)
28
29 MIPS:
30 o) Nicer MIPS status bits in register dumps.
31 o) Floating point exception correctness.
32 o) Fix this? Triggered by NetBSD/sgimips? Hm:
33 to_be_translated(): TODO: unimplemented instruction:
34 000000000065102c: 00200800 (d) rot_00 at,zr,0
35 o) Some more work on opcodes.
36 x) MIPS64 revision 2.
37 o) Find out which actual CPUs implement the rev2 ISA!
38 o) DINS, DINSM, DINSU etc
39 o) DROTR32 and similar MIPS64 rev 2 instructions,
40 which have a rotation bit which differs from
41 previous ISAs.
42 x) _MAYBE_ TX79 and R5900 actually differ in their
43 opcodes? Check this carefully!
44 o) Dyntrans: Count register updates are probably not 100% correct yet.
45 o) Refactor code for performance and readability/maintainability.
46 o) (Re)implement 128-bit loads/stores for R5900.
47 o) Coprocessor 1x (i.e. 3) should cause cp1 exceptions, not 3?
48 (See http://lists.gnu.org/archive/html/qemu-devel/2007-05/msg00005.html)
49 o) R4000 and others:
50 x) watchhi/watchlo exceptions, and other exception
51 handling details
52 o) MIPS 5K* have 42 physical address bits, not 40/44?
53 o) R10000 and others: (R12000, R14000 ?)
54 x) The code before the line
55 /* reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK; */
56 in cpu_mips.c is not correct for R10000 according to
57 Lemote's Godson patches for GXemul. TODO: Go through all
58 register definitions according to http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_263.html#HEADING334
59 and make sure everything works with R10000.
60 Then test with OpenBSD/sgi?
61 x) Entry LO mask (as above).
62 x) memory space, exceptions, ...
63 x) use cop0 framemask for tlb lookups
64 (http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_284.html)
65
66 SuperH:
67 x) Auto-generation of loads/stores! This should get rid of at least
68 the endianness check in each load/store.
69 x) Experiment with whether or not correct ITLB emulation is
70 actually needed. (20070522: I'm turning it off today.)
71 x) SH4 interrupt controller:
72 x) MASKING should be possible!
73 x) SH4 DMA (0xffa00000)
74 x) SH4 UBC (0xff200000)
75 x) Store queues can copy 32 bytes at a time, there's no need to
76 copy individual 32-bit words. (Performance improvement.)
77 x) SH4 BSC (Bus State Controller)
78 x) Instruction tracing should include symbols for branch targets,
79 and so on, to make the output more human readable.
80 x) SH3-specific devices: Pretty much everything!
81 x) NetBSD/evbsh3, hpcsh! Linux?
82 x) Floating point speed!
83 x) Floating point exception correctness.
84 x) NetBSD HEAD (as of April 2007) hangs during bootup, because it
85 turns on/off interrupts in an unfortunately synchronized way
86 with dyntrans. This needs to be fixed.
87 x) Exceptions for unaligned load/stores. OpenBSD/landisk uses
88 this mechanism for its reboot code (machine_reset).
89 x) Think carefully about how to implement SH5/SH64 (for evbsh5).
90
91 Landisk SH4:
92 x) When NetBSD/landisk 4.0 has been released, make sure it works
93 in the emulator. (Update documentation, etc.)
94
95 Dreamcast:
96 x) G2 DMA
97 x) LAN adapter (dev_mb8696x.c). NetBSD root-on-nfs.
98 x) PVR: Lots of stuff. See dev_pvr.c.
99 x) Better GDROM support
100 x) Modem
101 x) PCI bridge/bus?
102 x) Maple bus:
103 x) Correct controller input
104 x) Mouse input
105 x) Software emulation of BIOS calls:
106 x) GD-ROM emulation: Use the GDROM device.
107 x) Use the VGA font as a fake ROM font. (Better than
108 nothing.)
109 x) Make as many as possible of the KOS examples run!
110 x) More homebrew demos/games.
111 x) SPU: Sound emulation (ARM cpu).
112 x) VME processor emulation? "(Sanyo LC8670 "Potato")" according to
113 Wikipedia, LC86K87 according to Comstedt's page. See
114 http://www.maushammer.com/vmu.html for a good description of
115 the differences between LC86104C and the one used in the VME.
116
117 Alpha:
118 x) OSF1 PALcode, Virtual memory support.
119 x) PALcode replacement! PAL1E etc opcodes...?
120 x) Interrupt/exception/trap handling.
121 x) Floating point exception correctness.
122 x) More work on bootup memory and register contents.
123 x) More Alpha machine types, so it could work with
124 OpenBSD, FreeBSD, and Linux too?
125
126 SPARC (both the ISA and the machines):
127 o) Implement Adress space identifiers; load/stores etc.
128 o) Exception/trap/interrupt handling.
129 o) Save/restore register windows etc! Both v9 and pre-v9!
130 o) Finish the subcc and addcc flag computation code.
131 o) Add more registers (floating point, control regs etc)
132 o) Disassemly of some more instructions?
133 o) Are sll etc 32-bit sign-extending or zero-extending?
134 o) Floating point exception correctness.
135 o) SPARC v8, v7 etc?
136 o) More machine modes and devices.
137
138 POWER/PowerPC:
139 x) Fix DECR timer speed, so it matches the host.
140 x) NetBSD/prep 3.x triggers a possible bug in the emulator:
141 <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
142 <ata_get_xfer(0,0xd60cdd30,0,8,..)>
143 <0x26c550(&ata_xfer_pool,2,0,8,..)>
144 <0x35c71c(0x3f27000,0,52,8,..)>
145 <ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)>
146 <atastart(0xd005e4c8,0x3f27000,0,13,..)>
147 <__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)>
148 <bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)>
149 [ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ]
150 <wdcwait(0xd005e4c8,72,64,0xbb8,..)>
151 <0x198120(0xd005e4c8,72,64,0xbb8,..)>
152 <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
153 <delay(100,0,0,0xbb8,..)>
154 Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
155 x) PPC optimizations; instr combs
156 x) 64-bit stuff: either Linux on G5, or perhaps some hobbyist
157 version of AIX? (if there exists such a thing)
158 x) macppc: adb controller; keyboard (for framebuffer mode)
159 x) make OpenBSD/macppc work (PCI controller stuff)
160 x) Floating point exception correctness.
161 x) Alignment exceptions.
162
163 PReP:
164 x) Clock time! ("Bad battery blah blah")
165
166 Algor:
167 o) Other models than the P5064?
168 o) PCI interrupts... needed for stuff like the tlp NIC?
169
170 BeBox:
171 o) Interrupts. There seems to be a problem with WDC interrupts
172 "after a short while", although a few interrupts get through?
173 o) Perhaps find a copy of BeOS and try it?
174
175 HPCmips:
176 x) Mouse/pad support! :)
177 x) A NIC? (As a PCMCIA device?)
178
179 ARM:
180 o) See netwinder_reset() in NetBSD; the current "an internal error
181 occured" message after reboot/halt is too ugly.
182 o) Generic ARM "wait"-like instruction?
183 o) try to get netbsd/evbarm 3.x or 4.x running (iq80321)
184 o) make the xscale counter registers (ccnt) work
185 o) make the ata controller usable for FreeBSD!
186 o) Debian/cats crashes because of unimplemented coproc stuff.
187 fix this?
188
189 Test machines:
190 o) dev_fb block fill and copy
191 o) dev_fb draw characters (from the built-in font)?
192 o) dev_fb input device? mouse pointer coordinates and buttons
193 (allow changes in these to cause interrupts as well?)
194 o) Redefine the halt() function so that it stops "sometimes
195 soon", i.e. usage in demo code should be:
196 for (;;) {
197 halt();
198 }
199
200 Debugger:
201 o) How does SMP debugging work? Does it simply use "threads"?
202 What if the guest OS (running on an emulated SMP machine)
203 has a usertask running, with userland threads?
204 o) Try to make the debugger more modular and, if possible, reentrant!
205 o) Remove the emul command? (But show network info if showing
206 machines?)
207 o) Memory dumps should be able to dump both physical and
208 virtual emulated memory.
209 o) Evaluate expressions within []? That would allow stuff like
210 cpu[x] where x is an expression.
211 o) "pc = pc + 4" doesn't work! Bug. Should work. ("pc=pc+4" works.)
212 o) Settings:
213 x) Special handlers for Write!
214 +) MIPS coproc regs
215 +) Alpha/MIPS/SPARC zero registers
216 +) x86 64/32/16-bit registers
217 x) Value formatter for resulting output.
218 o) Call stack display (back-trace) of emulated programs.
219 o) Nicer looking output of register dumps, floating point registers,
220 etc. Warn about weird/invalid register contents.
221 o) Ctrl-C doesn't enter the debugger on some OSes (HP-UX?)...
222
223 Dyntrans:
224 x) For 32-bit emulation modes, that have emulated TLBs: tlbindex
225 arrays of mapped pages? Things to think about:
226 x) Only 32-bit mode! (64-bit => too much code)
227 x) One array for global pages, and one array _PER ASID_,
228 for those archs that support that. On M88K, there should
229 be one array for userspace, and one for supervisor, etc.
230 x) Larger-than-4K-pages must fill several bits in the array.
231 x) No TLB search will be necessary.
232 x) Total host space used, for 4 KB pages: 1 MB per table,
233 i.e. 65 MB for 32-bit MIPS, 2 MB for M88K, if one byte
234 is used as the tlb index.
235 x) (The index is actually +1, so that 0 means no hit.)
236 x) "Merge" the cur_physpage and cur_ic_page variables/pointers to
237 one? I.e. change cur_ic_page to cur_physpage.ic_page or something.
238 x) Instruction combination collisions? How to avoid easily...
239 x) Think about how to do both SHmedia and SHcompact in a reasonable
240 way! (Or AMD64 long/protected/real, for that matter.)
241 x) 68K emulation; think about how to do variable instruction
242 lengths across page boundaries.
243 x) Dyntrans with valgrind-inspired memory checker. (In memory_rw,
244 it would be reasonably simple to add; in each individual fast
245 load/store routine = a lot more work, and it would become
246 kludgy very fast.)
247 x) Dyntrans with SMP... lots of work to be done here.
248 x) Dyntrans with cache emulation... lots of work here as well.
249 x) Remove the concept of base RAM completely; it would be more
250 generic to allow RAM devices to be used "anywhere".
251 o) dev_mp doesn't work well with dyntrans yet
252 o) In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
253 x) Redesign/rethink the delay slot mechanism used for e.g. MIPS,
254 so that it caches a translation (that is, an instruction
255 word and the instr_call it was translated to the last
256 time), so that it doesn't need to do slow
257 to_be_translated for each end of page?
258 x) Program Counter statistics:
259 Per machine? What about SMP? All data to the same file?
260 A debugger command should be possible to use to enable/
261 disable statistics gathering.
262 Configuration file option!
263 x) Breakpoints:
264 o) Physical vs virtual addresses!
265 o) 32-bit vs 64-bit sign extension for MIPS, and others?
266 x) INVALIDATION should cause translations in _all_ cpus to be
267 invalidated, e.g. on a write to a write-protected page
268 (containing code)
269 x) 16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
270 x) Lots of other stuff: see src/cpus/README_DYNTRANS
271 x) Native code generation backends:
272 o) calculate at runtime whether or not chunks of emulated
273 (physical) memory are worth translating to native code
274 (it is assumed that it has high overhead)
275 o) experiment with calling the host's cc and ld externally;
276 extremely high overhead, but could be interesting none-
277 theless.
278 o) experiment with using LLVM, or GNU Lightning?
279 o) Important cases to think about:
280 x) loads/stores
281 x) delay branches
282 x) other kinds of calls, branches
283 o) branches to already translated code blocks can
284 link the blocks together (block-chaining), although
285 I'll probably want to wait with this until other
286 things work.
287 o) The first tests should be done with "testm88k", because
288 that does not affect other modes.
289
290 -------------------------------------------------------------------------------
291
292 Performance comparison when emulating the QEMU_MIPS machine (QEMU's default
293 MIPS machine mode):
294
295 mips-test-0.2:
296 --------------
297
298 1. while true; do ls -l > /dev/null; echo -n .; done, 80x36 dots
299 2. while true; do /usr/bin/md5sum /usr/bin/* > /dev/null; echo -n .; done, 80 dots
300 3. while true; do grep hej lib/libc.so.6 > /dev/null; echo -n .; done, 80 dots
301
302 Test 1 Test 2 Test 3
303 ------ ------ ------
304 QEMU 0.9.0: 2 min 20 sec 45 sec 4 min 41 seconds
305 GXemul-20070608: 1 min 59 sec 3 min 18 sec 18 min 10 seconds [A]
306
307
308 [A] = Normal portable dyntrans, no native code generation.
309
310 -------------------------------------------------------------------------------
311
312
313 Simple Valgrind-like checks?
314 o) Mark every address with bits which tell whether or not the address
315 has been written to.
316 o) What should happen when programs are loaded? Text/data, bss (zero
317 filled). But stack space and heap is uninitialized.
318 o) Uninitialized local variables:
319 A load from a place on the stack which has not previously
320 been stored to => warning. Increasing the stack pointer using
321 any available means should reset the memory to uninitialized.
322 o) If calls to malloc() and free() can be intercepted:
323 o) Access to a memory area after free() => warning.
324 o) Memory returned by malloc() is marked as not-initialized.
325 o) Non-passive, but good to have: Change the argument
326 given to malloc, to return a slightly larger memory
327 area, i.e. margin_before + size + margin_after,
328 and return the pointer + margin_before.
329 Any access to the margin_before or _after space results
330 in warnings. (free() must be modified to free the
331 actually allocated address.)
332
333 Better CD Image file support:
334 x) Support CD formats that contain more than 1 track, e.g.
335 CDI files (?). These can then contain a mixture of e.g. sound
336 and data tracks, and booting from an ISO filesystem path
337 would boot from [by default] the first data track.
338 (This would make sense for e.g. Dreamcast CD images, or
339 possibly other live-CD formats.)
340
341 Networking:
342 x) Redesign of the networking subsystem, at least the NAT translation
343 part. The current way of allowing raw ethernet frames to be
344 transfered to/from the emulator via UDP should probably be
345 extended to allow the frames to be transmitted other ways as
346 well.
347 x) Also adding support for connecting ttys (either to xterms, or to
348 pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
349 x) Documentation updates (!) are very important, making it easier to
350 use the (already existing) network emulation features.
351 x) Fix performance problems caused by only allowing a
352 single TCP packet to be unacked.
353 x) Don't hardcode offsets into packets!
354 x) Test with lower than 100 max tcp/udp connections,
355 to make sure that reuse works!
356 x) Make OpenBSD work better as a guest OS!
357 x) DHCP? Debian doesn't actually send DHCP packets, even
358 though it claims to? So it is hard to test.
359 x) Multiple networks per emulation, and let different
360 NICs in machines connect to different networks.
361 x) Support VDE (vde.sf.net)? Easiest/cleanest (before a
362 redesign of the network framework has been done) is
363 probably to connect it using the current (udp) solution.
364 x) Allow SLIP connections, possibly PPP, in addition to
365 ethernet?
366
367 Cache simulation:
368 o) Command line flags for:
369 o) CPU endianness?
370 o) Cache sizes? (multiple levels)
371 o) Separate from the CPU concept, so that multi-core CPUs sharing
372 e.g. a L2 cache can be simulated (?)
373 o) Instruction cache emulation is easiest (if separate from the
374 data cache); similar hack as the S;I; hack in cpu_dyntrans.c.
375 NOTE: if the architecture has a delay slot, then an instruction
376 slot can actually be executed as 2 instructions.
377 o) Data cache emulation = harder; each arch's load/store routines
378 must include support? running one instruction at a time and
379 having a cpu-dependant lookup function for each instruction
380 is another option (easier to implement, but very very slow).
381
382 Documentation:
383 x) Update the documentation regarding the testmachine interrupts.
384 x) Note about sandboxing/security:
385 Not all emulated instructions fail in the way they would
386 do on real hardware (e.g. a userspace program writing to
387 a system register might work in GXemul, but it would
388 fail on real hardware). Sandbox = contain from the
389 host OS. But the emulated programs will run "less
390 securely".
391 x) Try NetBSD/arc 4.x! (It seems to work with disk images!)
392 x) NetBSD/pmax 4 install instructions: xterm instead of vt100!
393 x) BETTER DEVICE EXAMPLES!
394 o) Move away from technical.html to somewhere new.
395 o) DEVICE_TICK
396 o) Implement example devices using interrupts, dyntrans
397 memory access, etc.?
398 x) Document the dyntrans core?
399 x) Rewrite the section about experimental devices, after the
400 framebuffer acceleration has been implemented, and demos
401 written. (Symbolic names instead of numbers; example
402 use cases, etc. Mention demo files that use the various
403 features?)
404 x) "a very simple linear framebuffer device (for graphics output)"
405 under "which machines does gxemul emulate" ==> better
406 description?
407 x) Better description on how to set up a cross compiler?
408 Example for MIPS64.
409 o) Automagic documentation generation?
410 x) machines, cpus, devices.
411 x) REMEMBER that several machines/devices can be in
412 the same source file!
413 o) Try to rewrite the install instructions for those machines
414 that use 3MAX into using CATS or hpcmips? (To remove the need
415 to use a raw ffs partition, using up all of the disk image.)
416
417 The Device subsystem:
418 x) allow devices to be moved and/or changed in size (down to a
419 minimum size, etc, or up to a max size); if there is a collision,
420 return false. It is up to the caller to handle this situation!
421 x) NOTE: Translations must be invalidated, both for
422 registering new devices, and for moving existing ones.
423 cpu->invalidate translation caches, for all CPUs that
424 are connected to a specific memory.
425 x) keep track of interrupts and busses? actually, allowing any device
426 to be a bus might be a nice idea.
427 x) turn interrupt controllers into devices? :-)
428 x) refactor various clocks/nvram/cmos into one device?
429
430 PCI:
431 x) Pretty much everything related to runtime configuration, device
432 slots, interrupts, etc must be redesigned/cleaned up. The current
433 code is very hardcoded and ugly.
434 o) Allow cards to be added/removed during runtime more easily.
435 o) Allow cards to be enabled/disabled (i/o ports, etc, like
436 NetBSD needs for disk controller detection).
437 o) Allow devices to be moved in memory during runtime.
438 o) Interrupts per PCI slot, etc. (A-D).
439 o) PCI interrupt controller logic... very hard to get right,
440 because these differ a lot from one machine to the next.
441 x) last write was ffffffff ==> fix this, it should be used
442 together with a mask to get the correct bits. also, not ALL
443 bits are size bits! (lowest 4 vs lowest 2?)
444 x) add support for address fixups
445 x) generalize the interrupt routing stuff (lines etc)
446
447 Clocks and timers:
448 x) Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)
449 x) DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
450 x) NetWinder timeofday is incorrect! Huh? grep -R for ta_rtc_read in
451 NetBSD sources; it doesn't seem to be initialized _AT ALL_?!
452 x) Cobalt TOD is incorrect!
453 x) Go through all other machines, one by one, and fix them.
454
455 Config file parser:
456 o) Rewrite it from scratch!
457 o) Usage of any expression available through the debugger
458 o) Allow interrupt controllers to be added! and interrupts
459 to be used in more ways than before
460 o) Support for running debugger commands (like the -c
461 command line option)
462
463 Floating point layer:
464 o) make it common enough to be used by _all_ emulation modes
465 o) implement correct error/exception handling and rounding modes
466 o) implement more helper functions (i.e. add, sub, mul...)
467 o) non-IEEE modes (i.e. x86)?
468
469 Userland emulation:
470 x) Try to prefix "/emul/mips/" or similar to all filenames,
471 and only if that fails, try the given filename.
472 Read this setting from an environment variable, and only
473 if there is none, fall back to hardcoded string.
474 x) File descriptor (0,1,2) assumptions? Find and fix these?
475 x) Dynamic linking!
476 x) Lots of stuff; freebsd, netbsd, linux, ... syscalls.
477 x) Initial register/stack contents (environment, command line args).
478 x) Return value (from main).
479 x) mmap emulation layer
480 x) errno emulation layer
481 x) struct conversions for many syscalls
482
483 Sound:
484 x) generic sound framework
485 x) add one or more sound cards as devices; add a testmachine
486 sound card first?
487 x) Dreamcast sound? Generic PCI sound cards?
488
489 ASC SCSI controller:
490 x) NetBSD/arc 2.0 uses the ASC controller in a way which GXemul
491 cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
492 in NetBSD itself, http://mail-index.netbsd.org/source-changes/
493 2005/11/06/0024.html suggests that.)
494 NetBSD 4.x seems to work? :)
495
496 Caches / memory hierarchies: (this is mostly MIPS-specific)
497 o) src/memory*.c: Implement correct cache emulation for
498 all CPU types. (currently only R2000/R3000 is implemented)
499 (per CPU, multiple levels should be possible, associativity etc!)
500 o) R2000/R3000 isn't _100%_ correct, just almost correct :)
501 o) Move the -S (fill mem with random) functionality into the
502 memory.c subsystem, not machine.c or wherever it is now
503 o) ECC stuff, simulation of memory errors? (Machine dependent)
504 o) More than 4GB of emulated RAM, when run on a 32-bit host?
505 (using manual swap-out of blocks to disk, ugly)
506 o) A global command line option should be used to turn
507 cache emulation on or off. When off, caches should be
508 faked like they are right now. When on, caches and
509 memory latencies should be emulated as correctly as
510 possible.
511
512 File/disk/symbol handling:
513 o) Make sure that disks can be added/removed during runtime!
514 (Perhaps this needs a reasonably large re-write.)
515 o) Remove some of the complexity in file format guessing, for
516 Ultrix kernels that are actually disk images?
517 o) Better handling of tape files
518 o) Read function argument count and types from binaries? (ELF?)
519 o) Better demangling of C++ names. Note: GNU's C++ differs from e.g.
520 Microsoft's C++, so multiple schemes must be possible. See
521 URL at top of src/symbol_demangle.c for more info.
522
523 Userland ABI emulation:
524 o) see src/useremul.c
525
526 Better framebuffer and X-windows functionality:
527 o) Generalize the update_x1y1x2y2 stuff to an extend-region()
528 function...
529 o) -Yx sometimes causes crashes.
530 o) Simple device access to framebuffer_blockcopyfill() etc,
531 and text output (using the built-in fonts), for dev_fb.
532 o) CLEAN UP the ugly event code
533 o) Mouse clicks can be "missed" in the current system; this is
534 not good. They should be put on a stack of some kind.
535 o) More 2D and 3D framebuffer acceleration.
536 o) Non-resizable windows? Or choose scaledown depending
537 on size (and center the image, with a black border).
538 o) Different scaledown on different windows?
539 o) Non-integral scale-up? (E.g. 640x480 -> 1024x768)
540 o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
541 o) Bug reported by Elijah Rutschman on MacOS with weird
542 keys (F5 = cursor down?).
543 o) Keyboard and mouse events:
544 x) Do this for more machines than just DECstation
545 x) more X11 cursor keycodes
546 x) Keys like CTRL, ALT, SHIFT do not get through
547 by themselves (these are necessary for example
548 to change the font of an xterm in X in the
549 emulator)
550 o) Generalize the framebuffer stuff by moving _ALL_ X11
551 specific code to src/x11.c!
552
553 -------------------------------------------------------------------------------
554

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