/[gxemul]/trunk/TODO
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 10 by dpavlin, Mon Oct 8 16:18:27 2007 UTC revision 28 by dpavlin, Mon Oct 8 16:20:26 2007 UTC
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1  $Id: TODO,v 1.139 2005/06/23 06:55:43 debug Exp $  $Id: TODO,v 1.324 2006/07/22 10:23:39 debug Exp $
2    
3  Here's a short list of what I have left to do on GXemul. This file is a mess.  Hm. This file is in random order, and not all parts of it are up-to-date.
 Order is random. Don't trust it to be up-to-date.  
4    
5          Caches / memory hierarchies: (this is mostly MIPS-specific)  Code cleanup:
6                  o)  MIPS coproc.c: bits in config registers should reflect          x)  64-bit ranges in src/cpus/memory_mips_v2p.c
7                      correct cache sizes for _all_ CPU types. (currently only          x)  Revert the dyntrans page template experiment? Hm.
8                      implemented for R4000, R1x000, and a few others)          x)  Refactor the cpu type detection/initialization/listing.
9                  o)  src/memory*.c: Implement correct cache emulation for  
10                      all CPU types. (currently only R2000/R3000 is implemented)  Documentation:
11                      (per CPU, multiple levels should be possible,          x)  Rewrite the section about experimental devices, after the
12                      associativity etc!)              framebuffer acceleration has been implemented, and demos
13                  o)  R2000/R3000 isn't _100%_ correct, just almost correct :)              written. (Symbolic names instead of numbers; example
14                  o)  Move the -S (fill mem with random) functionality into the              use cases, etc. Mention demo files that use the various
15                      memory.c subsystem, not machine.c or wherever it is now              features?)
16                  o)  ECC stuff, simulation of memory errors?  (Machine dependant)          x)  "a very simple linear framebuffer device (for graphics output)"
17                  o)  More than 4GB of emulated RAM, when run on a 32-bit host?              under "which machines does gxemul emulate" ==> better
18                      (using manual swap-out of blocks to disk, ugly)              description?
19                  o)  A global command line option should be used to turn          x)  Better description on how to set up a cross compiler?
20                      cache emulation on or off. When off, caches should be              Example for MIPS64.
21                      faked like they are right now. When on, caches and  
22                      memory latencies should be emulated as correctly as  Long-term implementation:
23                      possible.          x)  Testmachine includes:
24                    + dev_fb block fill and copy
25          Network layer:                  + dev_fb draw characters (from the built-in font)?
26                  o)  Multiple networks per emulation, and let different                  + dev_fb input device? mouse pointer coordinates and buttons
27                      NICs in machines connect to different networks.                          (allow changes in these to cause interrupts as well?)
28                  o)  many other issues: see src/net.c                  + Redefine the halt() function so that it stops "sometimes
29                      soon", i.e. usage in demo code should be:
30          CPU emulation:                          for (;;) {
31                  o)  Binary translation:                                  halt();
32                          +)  use an Intermediate Representation!                          }
33                          +)  recursive translation?          x)  Rewrite the networking stack; make OpenBSD work better as a guest
34                          +)  basic blocks instead of one-instruction? :)              OS, fix the performance problems, make Linux work with DHCP, etc.
35                          +)  on Alpha: don't assume pca56-like byte load/store?          x)  Make the wdc controller work with modern versions of NetBSD!
36                          +)  write backends for UltraSparc and MIPS          x)  Continue on SPARC emulation
37                          +)  see src/bintrans.c for more info                  + Enable it in the configure script as soon as it can
38                  o)  Dynamic-but-not-binary translation?                    run all the demo programs.
39                  o)  All the non-MIPS modes need a bit of work.          x)  Continue on Alpha emulation  (virtual memory, etc). Cleanup.
40            x)  Alignment exceptions (MIPS, PPC, ARM?, ...)
41          MIPS CPU emulation:  
42                  o)  Instructions:  Long-term design:
43                          o)  Regression tests (see tests/README for more info):          x)  Instruction combination collisions? How to avoid easily...
44                                  o)  Floating point exception handling, and          o)  Actually use the settings object, better debugger stuff, etc!
45                                          add more instructions.          o)  Debugger command for enabling/disabling instruction statistics
46                                  o)  Finish the MIPS16 translator, and test it!              during runtime.   machine.statistics = on|off
47                                  o)  MIPS ISA I, II, III, IV          x)  MAINBUS REDESIGN!
48                                  o)  MIPS V (SIMD vector stuff?)          x)  Clock framework! Go through all clock devices, make sure they
49                                  o)  MDMX  (MIPS Digital Media Extension)              return correct data, and run at correct speeds!
50                                  o)  MIPS 3D          x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,
51                                  o)  MIPS MT (Multi-thread stuff) (What's this?)              it would be reasonably simple to add; in each individual fast
52                          o)  Warn about mis-used bit fields (ie bits that              load/store routine = a lot more work, and it would become
53                              should be all zeroes, warn about if they are not)!              kludgy very fast.)
54                              Both for coprocessor registers and for instruction          x)  Dyntrans with SMP... lots of work to be done here.
55                              opcodes.          x)  Dyntrans with cache emulation... lots of work here as well.
56                          o)  the special2 stuff is a mess right now          x)  Reimplement the config file parser from scratch.
57                          o)  warn and/or cause exceptions for unimplemented  
58                              instructions (depending on CPU type)  Test:
59                  o)  R2000/R3000:          x)  Test with more than one Sprite instance on an emulated network!
60                          x)  R3000 "tri-byte stores". (What's this?)          x)  NetBSD 4.x, once it is out.
61                  o)  R4000 and others:  
62                          x)  watchhi/watchlo exceptions, and other exception  -------------------------------------------------------------------------------
63                              handling details  
64                  o)  R10000 and others:  (R12000, R14000 ?)  Simple Valgrind-like checks?
65                          x)  memory space, exceptions, ...          o)  Mark every address with bits which tell whether or not the address
66                          x)  use cop0 framemask for tlb lookups              has been written to.
67                              (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)          o)  What should happen when programs are loaded?  Text/data, bss (zero
68                  o)  Implement load delays?  Warnings on interlocks.              filled). But stack space and heap is uninitialized.
69                  o)  Implement all coprocessor 0 bits / functions.          o)  Uninitialized local variables:
70                          x)  coproc 0 selectors! (R4000 ?)                  A load from a place on the stack which has not previously
71                  o)  R4300 (nintendo64, no mmu?), R5900 (playstation2, weird                  been stored to => warning. Increasing the stack pointer using
72                          TLB/cache? 128-bit GPRs, new instructions),                  any available means should reset the memory to uninitialized.
73                          4K (note: NOT R4000), 5K (note: NOT R5000),          o)  If calls to malloc() and free() can be intercepted:
74                          R6000 (ISA II), R8000                  o)  Access to a memory area after free() => warning.
75                  o)  Multi-cpu stuff:                  o)  Memory returned by malloc() is marked as not-initialized.
76                          +)  SGI's NUMA architecture. Study                  o)  Non-passive, but good to have: Change the argument
77                                  x)  Linux sources                      given to malloc, to return a slightly larger memory
78                                  x)  SGI's specs on NUMA address space                      area, i.e.  margin_before + size + margin_after,
79                          +)  Ultrix?  NetBSD doesn't do SMP on MIPS yet :-(                      and return the pointer  + margin_before.
80                          +)  Own experiments with ycx2.                      Any access to the margin_before or _after space results
81                        in warnings. (free() must be modified to free the
82          Emulation of specific machines and devices:                      actually allocated address.)
83                  o)  Use same clock for all emulations and machines.  
84                  o)  Clean up the device stuff (registering of devices etc)  SMP:
85                  o)  Various SCSI and IDE controllers          o)  dev_mp doesn't work well with dyntrans yet
86                  o)  PS/2-style keyboard controller (for several machines)          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
87                  o)  Generic busses;  
88                          x)  PCI:  i/o and interrupts  MIPS:
89                          x)  QBus-22 (DECsystem 5500, 5400?)          +)  Some more work on opcodes.
90                  o)  DECstations (pmax):                  x) MIPS64 revision 2.
91                          x)  ioasic                          o)  Find out which actual CPUs implement the rev2 ISA!
92                          x)  framebuffers:                  x) _MAYBE_ TX79 and R5900 actually differ in their
93                                  +)  better cursor support, overlays?,                     opcodes? Check this carefully!
94                                  +)  2D/3D acceleration, PX[G]          o)  Dyntrans: Count register updates are probably not 100% correct yet.
95                          x)  status words / control words, make this more          o)  Refactor code for performance and readability/maintainability.
96                                  portable/cleaner          o)  Instruction combinations? Possible candidates (but profile first!):
97                          x)  scsi controller(s): sii, DMA for asc                  o)  R2000/R3000 cache cleaner!
98                          x)  serial controllers: ssc, scc (and more work on dc?)                  o)  strlen, memset loops etc
99                          x)  nvram on decstation 5000/125:  when using X11,                  o)  multiple loads/stores in a row, e.g. relative to
100                                  set console=g or similar                      the stack pointer
101                          x)  DECstation 5840? "xbi-based SMP"                  o)  lui + or, lui + add, and 64-bit variants
102                  o)  SGI and ARC machines (sgimips, arc):                  o)  jr ra + addiu to the v0 register?
103                          x)  IP32 ("O2"): (Lots of stuff)                  o)  compare + branch
104                                  +)  mec (ethernet)          o)  DROTR32 and similar MIPS64 rev 2 instructions, which have
105                                  +)  pci              a rotation bit which differs from previous ISAs.
106                                  +)  ahc (scsi)          o)  EI and DI instructions for MIPS64/32 rev 2. NOTE: These are
107                                  +)  ps2 kbd              _NOT_ the same as for R5900!
108                                  +)  memory controller          o)  (Re)implement 128-bit loads/stores for R5900.
109                                  +)  framebuffer/graphics          o)  R4000 and others:
110                                  +)  caches                  x)  watchhi/watchlo exceptions, and other exception
111                          x)  more ARCBIOS stuff                      handling details
112                          x)  Memory/interrupt controllers          o)  R10000 and others:  (R12000, R14000 ?)
113                          x)  IP30 (Linux with graphics support?)                  x)  memory space, exceptions, ...
114                          x)  SMP / NUMA?  (SGI and various ARC machines)                  x)  use cop0 framemask for tlb lookups
115                  o)  Playstation 2:                      (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)
116                          Hardware:  OHCI usb controller, keyboard, ...  
117                  o)  Less interesting platforms:  Dyntrans:
118                          o)  newsmips:          x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,
119                                  o)  NetBSD/newsmips, get it to detect a "real"                  so that it caches a translation (that is, an instruction
120                                      model, right now everything is 100% bogus                  word and the instr_call it was translated to the last
121                          o)  mipsco? (NetBSD)                  time), so that it doesn't need to do slow
122                          o)  wgrisc? (big endian R3000, in OpenBSD's attic)                  to_be_translated for each end of page?
123                          o)  other embedded / evaluation MIPS boards          x)  Program Counter statistics:
124                          o)  Playstation 1? R3000A. Weird hardware?                  Per machine? What about SMP? All data to the same file?
125                                  No FPU, but something as coproc 2.                  A debugger command should be possible to use to enable/
126                          o)  Nintendo 64, http://www.nintendo.com/systems/n64/n64_specs.jsp                  disable statistics gathering.
127                                  (R4300, 4MB RAM, really weird memory map)                  Configuration file option!
128            x)  Common fatal_abort() function, which drops into the debugger
129          File/disk handling:                  without continuing.
130                  o)  Read function argument count and types from binaries? (ELF?)          x)  INVALIDATION should cause translations in _all_ cpus to be
131                  o)  Better handling of tape files              invalidated, e.g. on a write to a write-protected page
132                (containing code)
133          Userland ABI emulation:          x)  Call/return hints?
134                  o)  see src/useremul.c          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)
135            x)  H8?
136          Terminal based interactive debugger:          x)  Lots of other stuff: see src/cpus/README_DYNTRANS
137                  o)  see src/debugger.c          x)  true recompilation backend? think carefully about this,
138                experiment in a separate project (not in GXemul)
139          Terminal/console stuff:                  o) First test would be to just implement a simple
140                  o)  allow emulated serial ports to be connected to the outside                     instruction such as MIPS' addiu or lui, on AMD64
141                      world in a more generic way, or even to other emulated                     hosts...
142                      machines(!)          x)  Idle loop detection? (Depends on target.) Could be turned
143                into usleep(1) or similar on the host... except when doing
144          Regression tests:  (Should be totally rewritten.)              e.g. SMP emulation. Then it becomes trickier.
145                  o)  see tests/  
146    Alpha:
147          Save state of the whole emulated machine, to be able to load it back          o)  Virtual memory (tlbs etc)
148                  in later?  (Memory, all device's states, all registers and          o)  Get {NetBSD,OpenBSD,Linux}/alpha booting. :)
149                  so on.  Like taking a snapshot. (SimOS seems to do this,  
150                  according to its website.))  SPARC:
151            o)  Add all registers (floating point, control regs etc)
152          Better X-windows functionality:          o)  Save/restore register windows etc!
153                  o)  CLEAN UP the ugly event code          o)  Load/stores!
154                  o)  Mouse clicks can be "missed" in the current system; this is          o)  Disassemly of some more instructions?
155                      not good. They should be put on a stack of some kind.          o)  Are sll etc 32-bit sign-extending or zero-extending?
156                  o)  More 2D and 3D framebuffer acceleration.          o)  Finish the cmp (subcc) flag computation code.
157                  o)  Non-resizable windows?  Or choose scaledown depending          o)  Finish the GDB register stuff.
158                          on size (and center the image, with a black border).          o)  SPARC v8, v7 etc?
159                  o)  Different scaledown on different windows?  
160                  o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)  Debugger:
161                  o)  Keyboard and mouse events:          o)  How does SMP debugging work? Does it simply use "threads"?
162                          x)  Do this for more machines than just DECstation                  What if the guest OS (running on an emulated SMP machine)
163                          x)  more X11 cursor keycodes                  has a usertask running, with userland threads?
164                          x)  Keys like CTRL, ALT, SHIFT do not get through          o)  Try to make the debugger more modular and, if possible, reentrant!
165                              by themselves (these are necessary for example          o)  Remove the emul command? (But show network info if showing
166                              to change the font of an xterm in X in the                  machines?)
167                              emulator)          o)  Generalize the expression evaluator. (debugger_expr.c?)
168                  o)  Generalize the framebuffer stuff by moving _ALL_ X11                  settable variables      ("show nr of instructions on average")
169                          specific code to src/x11.c!                  emul[x]                 defaults to current emul
170                    machine[x]              defaults to current machine
171          Statistics:  (this could be interesting)                  cpu[x]                  defaults to currently focused cpu
172                  o)  Save to file and show graphics. It should be possible to                  registers               cpu arch dependent (#-prefix)
173                      run gxemul after a simulation to just show the graphics,                  symbols                 @-prefix
174                      or convert to a .ppm or .tga or similar.                  numeric constants       decimal, hex, and octal ($-prefix)
175                  o)  memory accesses (to measure cache efficiency and                  boolean                 yes,no, true,false
176                          page coloring efficiency)                  operators (+ - * / % & | ^ !)
177                  o)  nr of simultaneous ASIDs in use in the TLB, for MIPS                  parentheses for grouping subexpressions
178                  o)  percentage of time spent in different "states", such as                  NOTE: the change from % to # for register prefix!
179                      running userland code, kernel code, or idling (for CPUs                  examples:
180                      that have such an instruction, or whenever the PC is                                  emul[0].machine[2].cpu[0].pc
181                      inside a specific idle-function (address range)).                                  machine[test2].cpu[1].ra = main
182                      Possible additional state (for example on R3000): caches                                  settings.show_trace_tree = yes
183                      disabled.  
184                  o)  position of read/write on (SCSI) disks                  Settings:
185                            o)  Remove a setting.
186                            o)  Read/write a setting given a name. (Read as
187                                string and/or int64_t simultaneously?)
188                            o)  Warnings when exiting the emulator, if the
189                                settings have not been removed exactly in
190                                the same way as they were added? This would
191                                improve code cleanliness in the long term.
192                                (I.e. require a corresponding _destroy()
193                                function for all _new functions... machine_
194                                cpu_ etc.)
195    
196                    Help command should have subsections! One for "expressions",
197                    mirrored in the documentation, but the internal help should
198                    be the one that should be considered correct.
199            o)  see src/debugger.c for more
200    
201    POWER/PowerPC:
202            x)  PPC optimizations; instr combs
203            x)  64-bit stuff: either Linux on G5, or perhaps some hobbyist
204                    version of AIX? (if there exists such a thing)
205            x)  find and fix the bug which causes NetBSD/macppc to fail after
206                an install!
207            x)  macppc: adb controller; keyboard (for framebuffer mode)
208            x)  make OpenBSD/macppc work (PCI controller stuff)
209    
210    Algor:
211            PCI and ISA and LOCAL interrupts! --> wdc could start working
212            Add interrupt controller in dev_algor.c.
213    
214    ARM:
215            o)  try to get netbsd/evbarm 3.x running (iq80321)
216            o)  make the xscale counter registers (ccnt) work
217            o)  make the ata controller usable for FreeBSD!
218            o)  zaurus for openbsd...
219            o)  debian/cats crashes because of unimplemented coproc stuff.
220                fix this?
221    
222    Cache simulation:
223            o)  Command line flags for:
224                    o)  CPU endianness?
225                    o)  Cache sizes? (multiple levels)
226            o)  Separate from the CPU concept, so that multi-core CPUs sharing
227                e.g. a L2 cache can be simulated (?)
228            o)  Instruction cache emulation is easiest (if separate from the
229                data cache); similar hack as the S;I; hack in cpu_dyntrans.c.
230                NOTE: if the architecture has a delay slot, then an instruction
231                slot can actually be executed as 2 instructions.
232            o)  Data cache emulation = harder; each arch's load/store routines
233                must include support? running one instruction at a time and
234                having a cpu-dependant lookup function for each instruction
235                is another option (easier to implement, but very very slow).
236    
237    Documentation:
238            o)  machines, cpus, devices.
239            o)  Automagic documentation generation:
240                    x)  REMEMBER that several machines/devices can be in
241                            the same source file!
242            o)  Try to rewrite the install instructions for those machines
243                that use 3MAX into using CATS? (To remove the need to a raw
244                ffs partition using up all of the disk image.)
245    
246    More generic out_of_memory error reporting, and check everywhere!
247            Causes: OpenBSD has low default limits for normal users.
248                    Host is 32-bit? (32-bit hosts are limited to 4 GB or less
249                    of userspace memory.)
250                    You are actually low on RAM. (As trivial as this might sound,
251                    Unix systems usually allow processes to allocate virtual
252                    memory beyond the amount of RAM in the machine.)
253    
254    Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc.
255            Use the debugger's symbolic name stuff. (which will have to be
256            extended soon to support stuff like  "2*x + symbol + y" etc. cool
257            stuff)
258    
259    The Device subsystem:
260            x)  allow devices to be moved and/or changed in size (down to a
261                minimum size, etc, or up to a max size)
262            x)  keep track of interrupts and busses? actually, allowing any device
263                to be a bus might be a nice idea.
264            x)  turn interrupt controllers into devices? :-)
265            x)  refactor various clocks/nvram/cmos into one device?
266    
267    Clocks:
268            x)  General framework for automagic clock adjustment for _all_
269                kinds of clocks and timers. (Which should be possible to turn
270                off, of course, like the way DECstation emulation works now.)
271    
272    PCI:
273            x)  last write was ffffffff ==> fix this, it should be used
274                together with a mask to get the correct bits. also, not ALL
275                bits are size bits! (lowest 4 vs lowest 2?)
276            x)  add support for address fixups
277            x)  generalize the interrupt routing stuff (lines etc). this should
278                be per machine? or per bus, that's better
279            x)  add a "pcn" NIC (AMD PCnet32 Lance 79c970 (PCI 1022:2000)),
280                could be useful for several machine modes (Malta, Algor, evbarm,
281                hp700?, macppc, etc.)
282    
283    Network layer:
284            o)  DHCP (for Debian and BSD installers :-)
285            o)  increase performance
286            o)  don't rely on NetBSD-ish usage
287            o)  Multiple networks per emulation, and let different
288                NICs in machines connect to different networks.
289            o)  many other issues: see src/net.c
290    
291    Busses:
292            o)  Redesign the entire "mainbus" concept!
293            o)  Busses should be placed in a hierarchical tree!
294            o)  Easily configurable interrupt routing in SMP systems.
295            o)  Specific clock/bus speeds, cpu speeds etc.
296            o)  Synchronization over network? or at least in dyntrans within
297                one emulated machine
298            o)  dev->bus: TurboChannel, PCMCIA, ADB?
299    
300    Config file parser:
301            o)  Rewrite it from scratch!
302            o)  Usage of any expression available through the debugger
303            o)  Support for running debugger commands (like the -c
304                command line option)
305    
306    Floating point layer:
307            o)  make it common enough to be used by _all_ emulation modes
308            o)  implement more stuff
309            o)  non-IEEE modes (i.e. x86)?
310    
311    Userland emulation:
312            x)  Lots of stuff; freebsd and netbsd (and linux?) syscalls.
313            x)  Dynamic linking? Hm.
314    
315    Sound:
316            x)  generic sound framework
317            x)  add one or more sound cards as devices
318    
319    ASC SCSI controller:
320            x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul
321                cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
322                in NetBSD itself, http://mail-index.netbsd.org/source-changes/
323                2005/11/06/0024.html suggests that.)
324    
325    Caches / memory hierarchies: (this is mostly MIPS-specific)
326            o)  src/memory*.c: Implement correct cache emulation for
327                all CPU types. (currently only R2000/R3000 is implemented)
328                (per CPU, multiple levels should be possible, associativity etc!)
329            o)  R2000/R3000 isn't _100%_ correct, just almost correct :)
330            o)  Move the -S (fill mem with random) functionality into the
331                memory.c subsystem, not machine.c or wherever it is now
332            o)  ECC stuff, simulation of memory errors?  (Machine dependent)
333            o)  More than 4GB of emulated RAM, when run on a 32-bit host?
334                (using manual swap-out of blocks to disk, ugly)
335            o)  A global command line option should be used to turn
336                cache emulation on or off. When off, caches should be
337                faked like they are right now. When on, caches and
338                memory latencies should be emulated as correctly as
339                possible.
340    
341    File/disk/symbol handling:
342            o)  Remove some of the complexity in file format guessing, for
343                    Ultrix kernels that are actually disk images?
344            o)  Better handling of tape files
345            o)  Read function argument count and types from binaries? (ELF?)
346            o)  Better demangling of C++ names. Note: GNU's C++ differs from e.g.
347                Microsoft's C++, so multiple schemes must be possible. See
348                URL at top of src/symbol_demangle.c for more info.
349    
350    Userland ABI emulation:
351            o)  see src/useremul.c
352    
353    Terminal/console:
354            o)  allow emulated serial ports to be connected to the outside
355                world in a more generic way, or even to other emulated
356                machines(?)
357    
358    Save state of the whole emulated machine, to be able to load it back
359            in later?  (Memory, all device's states, all registers and
360            so on.  Like taking a snapshot. (SimOS seems to do this,
361            according to its website.))
362    
363    Better framebuffer and X-windows functionality:
364            o)  -Yx sometimes causes crashes.
365            o)  Simple device access to framebuffer_blockcopyfill() etc,
366                and text output (using the built-in fonts), for dev_fb.
367            o)  CLEAN UP the ugly event code
368            o)  Mouse clicks can be "missed" in the current system; this is
369                not good. They should be put on a stack of some kind.
370            o)  More 2D and 3D framebuffer acceleration.
371            o)  Non-resizable windows?  Or choose scaledown depending
372                    on size (and center the image, with a black border).
373            o)  Different scaledown on different windows?
374            o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
375            o)  Bug reported by Elijah Rutschman on MacOS with weird
376                keys (F5 = cursor down?).
377            o)  Keyboard and mouse events:
378                    x)  Do this for more machines than just DECstation
379                    x)  more X11 cursor keycodes
380                    x)  Keys like CTRL, ALT, SHIFT do not get through
381                        by themselves (these are necessary for example
382                        to change the font of an xterm in X in the
383                        emulator)
384            o)  Generalize the framebuffer stuff by moving _ALL_ X11
385                    specific code to src/x11.c!
386    
387    Statistics:  (this could be interesting)
388            o)  Save to file and show graphics. It should be possible to
389                run gxemul after a simulation to just show the graphics,
390                or convert to a .ppm or .tga or similar.
391            o)  memory accesses (to measure cache efficiency and
392                    page coloring efficiency)
393            o)  nr of simultaneous ASIDs in use in the TLB, for MIPS
394            o)  percentage of time spent in different "states", such as
395                running userland code, kernel code, or idling (for CPUs
396                that have such an instruction, or whenever the PC is
397                inside a specific idle-function (address range)).
398                Possible additional state (for example on R3000): caches
399                disabled.
400            o)  position of read/write on (SCSI) disks
401    

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