/[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 24 by dpavlin, Mon Oct 8 16:19:56 2007 UTC revision 34 by dpavlin, Mon Oct 8 16:21:17 2007 UTC
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1  $Id: TODO,v 1.292 2006/06/23 09:13:34 debug Exp $  $Id: TODO,v 1.453 2007/02/19 01:34:42 debug Exp $
2    
3  Hm. This file is in random order, and not all parts of it are up-to-date.  -------------------------------------------------------------------------------
4    
5  --------------  Fix after the 0.4.4 release:
6            Fix the PowerPC DECR interrupt speed!
7    
8  Possible release schedule:  -------------------------------------------------------------------------------
9    
10  0.4.0:  Possible (relatively large) work packages to concentrate on in the future:
11          x)  Quick release, even though performance for non-R3000 MIPS dyntrans  
12              is really poor. (Assuming everything mentioned in the documentation    x)  SMP:
13              works as expected.)          Get SMP working again. It is pretty much broken since I started
14            the conversion from the old bintrans system to the new dyntrans system.
15  0.4.1:          Add better Test machine demos for SMP in the demos directory.
16          x)  FIX THE NON-R3000 TRANSLATION CACHE INVALIDATION BOTTLENECKS!  
17          x)  Fix the interrupt problems with Ultrix!    x)  Network:
18          x)  Find/fix bug which is triggered when building the emulator inside          Redesign of the networking subsystem, at least the NAT translation
19              NetBSD/pmax 3.0 inside the emulator!          part. The current way of allowing raw ethernet frames to be
20            transfered to/from the emulator via UDP should probably be extended
21  0.4.2 ...?          to allow the frames to be transmitted other ways as well.
22          x)  Clean-up!          Also adding support for connecting ttys (either to xterms, or to
23          x)  Clock framework? Go through all clock devices, make sure they          pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
24              return correct data, and run at correct speeds!  
25          x)  Optimizations, continuing on 64-bit issues etc with dyntrans    x)  PCI:
26          x)  Dyntrans with SMP... lots of work to be done here.          Pretty much everything related to runtime configuration, device
27          x)  Dyntrans with cache emulation... lots of work here as well.          slots, interrupts, whatever. The current code is very hardcoded
28          x)  Actually use the settings object, better debugger stuff, etc.          and ugly.
29          x)  Wait for new releases of NetBSD, and test with those.  
30      x)  Debugging:
31            Think more about SMP debugging, etc. Right now, the
32            debugger is a mess. Also, a better connection to GDB would be
33            very nice to have.
34    
35      x)  Userland emulation:
36            Primary goals would be NetBSD and Linux syscall emulation.
37    
38    And of course, there are _LOTS_ of minor TODOs spread out throughout
39    the source code, which must be fixed sooner or later.
40    
41  --------------  -------------------------------------------------------------------------------
42    
43  SMP:  Some other things, in random order, that I'd like to fix: (Some items in
44    this list are probably out-to-date by now.)
45    
46    Dyntrans:
47            x)  Instruction combination collisions? How to avoid easily...
48            x)  Think about how to do both SHmedia and SHcompact in a reasonable
49                way! (Or AMD64 long/protected/real, for that matter.)
50            x)  68K emulation; think about how to do variable instruction
51                lengths across page boundaries.
52            x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,
53                it would be reasonably simple to add; in each individual fast
54                load/store routine = a lot more work, and it would become
55                kludgy very fast.)
56            x)  Dyntrans with SMP... lots of work to be done here.
57            x)  Dyntrans with cache emulation... lots of work here as well.
58          o)  dev_mp doesn't work well with dyntrans yet          o)  dev_mp doesn't work well with dyntrans yet
59          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
60            x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,
61                    so that it caches a translation (that is, an instruction
62                    word and the instr_call it was translated to the last
63                    time), so that it doesn't need to do slow
64                    to_be_translated for each end of page?
65            x)  Program Counter statistics:
66                    Per machine? What about SMP? All data to the same file?
67                    A debugger command should be possible to use to enable/
68                    disable statistics gathering.
69                    Configuration file option!
70            x)  Breakpoints:
71                    o) Physical vs virtual addresses!
72                    o) 32-bit vs 64-bit sign extension for MIPS, and others?
73            x)  INVALIDATION should cause translations in _all_ cpus to be
74                invalidated, e.g. on a write to a write-protected page
75                (containing code)
76            x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
77            x)  Lots of other stuff: see src/cpus/README_DYNTRANS
78            x)  true recompilation backend? think carefully about this.
79                    o)  abstract syntax for emitting opcopdes
80                    o)  convert into native code only after an entire
81                            block has been translated? probably best.
82                    o)  x86/amd64 code generator can be very similar... perhaps
83                    o)  branches to already translated code blocks can
84                            link the blocks together
85                    o)  load/store are the most important.
86    
87    Simple Valgrind-like checks?
88            o)  Mark every address with bits which tell whether or not the address
89                has been written to.
90            o)  What should happen when programs are loaded?  Text/data, bss (zero
91                filled). But stack space and heap is uninitialized.
92            o)  Uninitialized local variables:
93                    A load from a place on the stack which has not previously
94                    been stored to => warning. Increasing the stack pointer using
95                    any available means should reset the memory to uninitialized.
96            o)  If calls to malloc() and free() can be intercepted:
97                    o)  Access to a memory area after free() => warning.
98                    o)  Memory returned by malloc() is marked as not-initialized.
99                    o)  Non-passive, but good to have: Change the argument
100                        given to malloc, to return a slightly larger memory
101                        area, i.e.  margin_before + size + margin_after,
102                        and return the pointer  + margin_before.
103                        Any access to the margin_before or _after space results
104                        in warnings. (free() must be modified to free the
105                        actually allocated address.)
106    
107  MIPS:  MIPS:
108          o)  Fix invalidate_asid so it works well for non-R3000 too!          o)  Nicer MIPS status bits in register dumps.
109          x)  [Re]add an interrupt-asserted bit for MIPS, to speed up          o)  Alignment exceptions.
110              interrupt handling slightly?          o)  Floating point exception correctness.
111          +)  Print a warning on the first reserved instruction.          o)  Fix this? Triggered by NetBSD/sgimips? Hm:
112          +)  Some more work on opcodes.                  to_be_translated(): TODO: unimplemented instruction:
113                    000000000065102c: 00200800 (d)  rot_00  at,zr,0
114            o)  Some more work on opcodes.
115                  x) MIPS64 revision 2.                  x) MIPS64 revision 2.
116                            o)  Find out which actual CPUs implement the rev2 ISA!
117                            o)  DROTR32 and similar MIPS64 rev 2 instructions,
118                                which have a rotation bit which differs from
119                                previous ISAs.
120                            o)  EI and DI instructions for MIPS64/32 rev 2.
121                                NOTE: These are _NOT_ the same as for R5900!
122                  x) _MAYBE_ TX79 and R5900 actually differ in their                  x) _MAYBE_ TX79 and R5900 actually differ in their
123                     opcodes? Check this carefully!                     opcodes? Check this carefully!
124          o)  Dyntrans: Count register updates are probably not 100% correct yet.          o)  Dyntrans: Count register updates are probably not 100% correct yet.
         o)  Dyntrans: SMP correctness  
125          o)  Refactor code for performance and readability/maintainability.          o)  Refactor code for performance and readability/maintainability.
126          o)  Instruction combinations? Possible candidates (but profile first!):          o)  (Re)implement 128-bit loads/stores for R5900.
                 o)  multiple loads/stores in a row  
                 o)  strlen, memset loops etc  
                 o)  compare + branch  
         o)  DROTR32 and similar MIPS64 rev 2 instructions, which have  
             a rotation bit which differs from previous ISAs.  
         o)  EI and DI instructions for MIPS64/32 rev 2. NOTE: These are  
             _NOT_ the same as for R5900!  
127          o)  R4000 and others:          o)  R4000 and others:
128                  x)  watchhi/watchlo exceptions, and other exception                  x)  watchhi/watchlo exceptions, and other exception
129                      handling details                      handling details
130          o)  R10000 and others:  (R12000, R14000 ?)          o)  R10000 and others:  (R12000, R14000 ?)
131                    x)  The code before the line
132                            /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */
133                        in cpu_mips.c is not correct for R10000 according to
134                        Lemote's Godson patches for GXemul. TODO: Go through all
135                        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
136                        and make sure everything works with R10000.
137                        Then test with OpenBSD/sgi?
138                  x)  memory space, exceptions, ...                  x)  memory space, exceptions, ...
139                  x)  use cop0 framemask for tlb lookups                  x)  use cop0 framemask for tlb lookups
140                      (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)                      (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)
141    
142  Dyntrans:  SuperH:
143          x)  Move the mips_init_64bit_dummy_tables() etc calls into          x)  SH4 interrupt controller:
144              src/cpu.c, for all 64-bit cpus?                  x)  Implement correct priorities of interrupts
145          x)  64-bit "phystranslation" lookup as in 32-bit mode? Would probably          x)  SH4 DMA (0xffa00000)
146                  help performance a bit.          x)  SH4 UBC (0xff200000)
147          x)  Common fatal_abort() function, which drops into the debugger          x)  Store queues can copy 32 bytes at a time, there's no need to
148                  without continuing.              copy individual 32-bit words. (Performance improvement.)
149          x)  INVALIDATION should cause translations in _all_ cpus to be          x)  SH4 BSC (Bus State Controller)
150              invalidated, e.g. on a write to a write-protected page          x)  SH4 RTC: Read the host's clock.
151              (containing code)          x)  SH4 SCIF: Serial _interrupts_
152          x)  better (formally defined) instr call statistics (-s command          x)  Instruction tracing should include symbols for branch targets,
153              line option?), multiple different types? (virtual pc, physical pc)              and so on, to make the output more human readable.
154          x)  Call/return hints?          x)  NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?
155          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)          x)  Replace pc-relative loads with immediate load, if within the
156          x)  H8?              same page. (Similar to the same optimization for ARM.)
157          x)  Lots of other stuff: see src/cpus/README_DYNTRANS          x)  Floating point speed!
158          x)  true recompilation backend? think carefully about this,          x)  Floating point exception correctness.
159              experiment in a separate project (not in GXemul)          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).
160          x)  Remove the dyntrans_alignment_check functionality; although  
161              it gives slightly higher peformance sometimes, it increases  Dreamcast:
162              the complexity of the code too much!          x)  G2 DMA
163            x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
164            x)  PVR:  Lots of stuff. See dev_pvr.c.
165            x)  GDROM
166            x)  Modem
167            x)  PCI bridge/bus?
168            x)  Maple bus:
169                    x)  Correct controller input
170                    x)  Mouse input
171            x)  Software emulation of BIOS calls:
172                    x)  GD-ROM emulation: Use the GDROM device.
173                    x)  Use the VGA font as a fake ROM font. (Better than
174                        nothing.)
175            x)  Linux/dreamcast? (The gentoo kernel currently crashes.)
176            x)  Make as many as possible of the KOS examples run!
177            x)  More homebrew demos/games.
178            x)  SPU: Sound emulation (ARM cpu).
179            x)  VME processor emulation? "(Sanyo LC8670 "Potato")" according to
180                Wikipedia, LC86K87 according to Comstedt's page. See
181                http://www.maushammer.com/vmu.html for a good description of
182                the differences between LC86104C and the one used in the VME.
183    
184    Transputer:
185            x)  Implement support for Helios binaries.
186            x)  Stack and register contents at startup?
187            x)  Figure out how to boot an entire Helios distribution.
188            x)  Implement all instructions. :)
189    
190    RCA1802/RCA1805, CHIP8:
191            x)  CHIP8 -> RCA180x conversion
192                    x)  Think about how to do dual-mode, variable-instr-length
193                        ISAs, and switch between modes.
194                    x)  1805 "extended" opcode -> trigger CHIP8 emulation?
195                            That is, all calls 0NNN could point to 0x68 opcodes,
196                            which, if running on a 1802 in CHIP8-emulation-mode,
197                            would be manually interpreted.
198                    x)  Better solution:
199                            CHIP8 calls to 00xx => handle at high level,
200                                  calls to 0xxx in general = call 180X machine code
201                                    (0000 = reboot?)
202            x)  1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html
203                and:  http://www.elf-emulation.com/1802.html
204            x)  1805 extended opcodes: Implement at least disassembly support!
205            x)  Keyboard input.
206            x)  Sound (beep only).
207            x)  Slow-down to correct speed? Wikipedia: "it was usually operated
208                at 3.58 MHz/2 to suit the requirements of the 1861 chip which
209                gave a speed of a little over 100,000 instructions per second"
210                (Note that _CHIP8_ emulation would then be even slower.)
211            x)  SCHIP48 (Super) emulation:
212                    Some more opcodes, 128x64 framebuffer, larger
213                    sprites and fonts.
214    
215  Alpha:  Alpha:
216          o)  Virtual memory (tlbs etc)          x)  OSF1 PALcode, Virtual memory support.
217          o)  Get {NetBSD,OpenBSD,Linux}/alpha booting. :)          x)  PALcode replacement! PAL1E etc opcodes...?
218            x)  Interrupt/exception/trap handling.
219            x)  Floating point exception correctness.
220            x)  More work on bootup memory and register contents.
221            x)  More Alpha machine types, so it could work with
222                OpenBSD, FreeBSD, and Linux too?
223    
224  SPARC:  SPARC:
225          o)  Add all registers (floating point, control regs etc)          o)  Implement Adress space identifiers; load/stores etc.
226          o)  Save/restore register windows etc!          o)  Save/restore register windows etc! Both v9 and pre-v9!
227          o)  Disassemly of some more instructions.          o)  Finish the subcc and addcc flag computation code.
228            o)  Add more registers (floating point, control regs etc)
229            o)  Exception/trap handling.
230            o)  Disassemly of some more instructions?
231          o)  Are sll etc 32-bit sign-extending or zero-extending?          o)  Are sll etc 32-bit sign-extending or zero-extending?
         o)  Finish the cmp (subcc) flag computation code.  
232          o)  Finish the GDB register stuff.          o)  Finish the GDB register stuff.
233            x)  Floating point exception correctness.
234            o)  SPARC v8, v7 etc?
235    
236  Debugger:  Debugger:
237          o)  How does SMP debugging work? Does it simply use "threads"?          o)  How does SMP debugging work? Does it simply use "threads"?
# Line 102  Debugger: Line 240  Debugger:
240          o)  Try to make the debugger more modular and, if possible, reentrant!          o)  Try to make the debugger more modular and, if possible, reentrant!
241          o)  Remove the emul command? (But show network info if showing          o)  Remove the emul command? (But show network info if showing
242                  machines?)                  machines?)
243          o)  Generalize the expression evaluator. (debugger_expr.c?)          o)  Evaluate expressions within []? That would allow stuff like
244                  settable variables      ("show nr of instructions on average")                  cpu[x] where x is an expression.
245                  emul[x]                 defaults to current emul          o)  Settings:
246                  machine[x]              defaults to current machine                  x)  Special handlers for Write!
247                  cpu[x]                  defaults to currently focused cpu                          +)  MIPS coproc regs
248                  registers               cpu arch dependent (#-prefix)                          +)  Alpha/MIPS/SPARC zero registers
249                  symbols                 @-prefix                          +)  x86 64/32/16-bit registers
250                  numeric constants       decimal, hex, and octal ($-prefix)                  x)  Value formatter for resulting output.
                 boolean                 yes,no, true,false  
                 operators (+ - * / % & | ^ !)  
                 parentheses for grouping subexpressions  
                 NOTE: the change from % to # for register prefix!  
                 examples:  
                                 emul[0].machine[2].cpu[0].pc  
                                 machine[test2].cpu[1].ra = main  
                                 settings.show_trace_tree = yes  
   
                 Settings:  
                         o)  Remove a setting.  
                         o)  Read/write a setting given a name. (Read as  
                             string and/or int64_t simultaneously?)  
   
                 Help command should have subsections! One for "expressions",  
                 mirrored in the documentation, but the internal help should  
                 be the one that should be considered correct.  
251          o)  see src/debugger.c for more          o)  see src/debugger.c for more
252    
253  POWER/PowerPC:  POWER/PowerPC:
254            x)  Fix DECR timer speed, so it matches the host.
255            x)  NetBSD/prep 3.x triggers a possible bug in the emulator:
256                <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
257                  <ata_get_xfer(0,0xd60cdd30,0,8,..)>
258                    <0x26c550(&ata_xfer_pool,2,0,8,..)>
259                    <0x35c71c(0x3f27000,0,52,8,..)>
260                  <ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)>
261                    <atastart(0xd005e4c8,0x3f27000,0,13,..)>
262                      <__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)>
263                        <bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)>
264                    [ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ]
265                        <wdcwait(0xd005e4c8,72,64,0xbb8,..)>
266                          <0x198120(0xd005e4c8,72,64,0xbb8,..)>
267                            <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
268                            <delay(100,0,0,0xbb8,..)>
269                Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
270          x)  PPC optimizations; instr combs          x)  PPC optimizations; instr combs
271          x)  64-bit stuff          x)  64-bit stuff: either Linux on G5, or perhaps some hobbyist
272          x)  find and fix the bug which causes NetBSD/macppc to fail after                  version of AIX? (if there exists such a thing)
             an install!  
273          x)  macppc: adb controller; keyboard (for framebuffer mode)          x)  macppc: adb controller; keyboard (for framebuffer mode)
274          x)  make OpenBSD/macppc work (PCI controller stuff)          x)  make OpenBSD/macppc work (PCI controller stuff)
275            x)  Floating point exception correctness.
276            x)  Alignment exceptions.
277    
278    PReP:
279            Clock time! ("Bad battery blah blah")
280    
281  Algor:  Algor:
282          PCI and ISA and LOCAL interrupts! --> wdc could start working          o)  Other models than the P5064?
283          Add interrupt controller in dev_algor.c.          o)  PCI interrupts... needed for stuff like the tlp NIC?
284    
285    BeBox:
286            o)  Interrupts. There seems to be a problem with WDC interrupts
287                "after a short while", although a few interrupts get through?
288            o)  Perhaps find a copy of BeOS and try it?
289    
290    HPCmips:
291            x)  Mouse/pad support! :)
292            x)  A NIC? (As a PCMCIA device?)
293    
294    AVR:
295            o)  Everything.
296    
297  ARM:  ARM:
298          o)  try to get netbsd/evbarm 3.x running (iq80321)          o)  See netwinder_reset() in NetBSD; the current "an internal error
299                occured" message after reboot/halt is too ugly.
300            o)  ARM "wait"-like instruction?
301            o)  try to get netbsd/evbarm 3.x or 4.x running (iq80321)
302          o)  make the xscale counter registers (ccnt) work          o)  make the xscale counter registers (ccnt) work
303          o)  make the ata controller usable for FreeBSD!          o)  make the ata controller usable for FreeBSD!
304          o)  zaurus for openbsd...          o)  Zaurus emulation, for e.g. OpenBSD/zaurus
305          o)  debian/cats crashes because of unimplemented coproc stuff.          o)  Debian/cats crashes because of unimplemented coproc stuff.
306              fix this?              fix this?
307    
308    Test machines:
309            o)  dev_fb block fill and copy
310            o)  dev_fb draw characters (from the built-in font)?
311            o)  dev_fb input device? mouse pointer coordinates and buttons
312                    (allow changes in these to cause interrupts as well?)
313            o)  Redefine the halt() function so that it stops "sometimes
314                soon", i.e. usage in demo code should be:
315                    for (;;) {
316                            halt();
317                    }
318    
319    Better CD Image file support:
320            x)  Support CD formats that contain more than 1 track, e.g.
321                CDI files (?). These can then contain a mixture of e.g. sound
322                and data tracks, and booting from an ISO filesystem path
323                would boot from [by default] the first data track.
324                (This would make sense for e.g. Dreamcast CD images, or
325                possibly other live-CD formats.)
326    
327    Networking:
328            x)  Fix performance problems caused by only allowing a
329                single TCP packet to be unacked.
330            x)  Don't hardcode offsets into packets!
331            x)  Test with lower than 100 max tcp/udp connections,
332                to make sure that reuse works!
333            x)  Make OpenBSD work better as a guest OS!
334            x)  DHCP? Debian doesn't actually send DHCP packets, even
335                    though it claims to? So it is hard to test.
336            x)  Multiple networks per emulation, and let different
337                NICs in machines connect to different networks.
338            x)  Support VDE (vde.sf.net)? Easiest/cleanest (before a
339                redesign of the network framework has been done) is
340                probably to connect it using the current (udp) solution.
341            x)  Allow SLIP connections, possibly PPP, in addition to
342                ethernet?
343    
344  Cache simulation:  Cache simulation:
345            o)  Command line flags for:
346                    o)  CPU endianness?
347                    o)  Cache sizes? (multiple levels)
348          o)  Separate from the CPU concept, so that multi-core CPUs sharing          o)  Separate from the CPU concept, so that multi-core CPUs sharing
349              e.g. a L2 cache can be simulated (?)              e.g. a L2 cache can be simulated (?)
350          o)  Instruction cache emulation is easiest (if separate from the          o)  Instruction cache emulation is easiest (if separate from the
# Line 162  Cache simulation: Line 357  Cache simulation:
357              is another option (easier to implement, but very very slow).              is another option (easier to implement, but very very slow).
358    
359  Documentation:  Documentation:
360          o)  machines, cpus, devices.          x)  Note about sandboxing/security:
361          o)  Automagic documentation generation:                  Not all emulated instructions fail in the way they would
362                    do on real hardware (e.g. a userspace program writing to
363                    a system register might work in GXemul, but it would
364                    fail on real hardware).  Sandbox = contain from the
365                    host OS. But the emulated programs will run "less
366                    securely".
367            x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)
368            x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!
369            x)  BETTER DEVICE EXAMPLES!
370                    o)  Move away from technical.html to somewhere new.
371                    o)  DEVICE_TICK
372                    o)  Implement example devices using interrupts, dyntrans
373                        memory access, etc.?
374            x)  Document the dyntrans core?
375            x)  Rewrite the section about experimental devices, after the
376                framebuffer acceleration has been implemented, and demos
377                written. (Symbolic names instead of numbers; example
378                use cases, etc. Mention demo files that use the various
379                features?)
380            x)  "a very simple linear framebuffer device (for graphics output)"
381                under "which machines does gxemul emulate" ==> better
382                description?
383            x)  Better description on how to set up a cross compiler?
384                Example for MIPS64.
385            o)  Automagic documentation generation?
386                    x)  machines, cpus, devices.
387                  x)  REMEMBER that several machines/devices can be in                  x)  REMEMBER that several machines/devices can be in
388                          the same source file!                          the same source file!
389          o)  Try to rewrite the install instructions for those machines          o)  Try to rewrite the install instructions for those machines
390              that use 3MAX into using CATS? (To remove the need to a raw              that use 3MAX into using CATS or hpcmips? (To remove the need
391              ffs partition using up all of the disk image.)              to use a raw ffs partition, using up all of the disk image.)
392    
393  More generic out_of_memory error reporting, and check everywhere!  More generic out_of_memory error reporting, and check everywhere!
394          Causes: OpenBSD has low default limits for normal users.          Causes: OpenBSD has low default limits for normal users.
# Line 178  More generic out_of_memory error reporti Line 398  More generic out_of_memory error reporti
398                  Unix systems usually allow processes to allocate virtual                  Unix systems usually allow processes to allocate virtual
399                  memory beyond the amount of RAM in the machine.)                  memory beyond the amount of RAM in the machine.)
400    
 Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc.  
         Use the debugger's symbolic name stuff. (which will have to be  
         extended soon to support stuff like  "2*x + symbol + y" etc. cool  
         stuff)  
   
 Sprite (guest OS for DECstation emulation)  
         x)  Timing problems during bootup?  
   
401  The Device subsystem:  The Device subsystem:
402          x)  allow devices to be moved and/or changed in size (down to a          x)  allow devices to be moved and/or changed in size (down to a
403              minimum size, etc, or up to a max size)              minimum size, etc, or up to a max size); if there is a collision,
404                return false. It is up to the caller to handle this situation!
405            x)  NOTE: Translations must be invalidated, both for
406                registering new devices, and for moving existing ones.
407                cpu->invalidate translation caches, for all CPUs that
408                are connected to a specific memory.
409          x)  keep track of interrupts and busses? actually, allowing any device          x)  keep track of interrupts and busses? actually, allowing any device
410              to be a bus might be a nice idea.              to be a bus might be a nice idea.
411          x)  turn interrupt controllers into devices? :-)          x)  turn interrupt controllers into devices? :-)
412          x)  refactor various clocks/nvram/cmos into one device?          x)  refactor various clocks/nvram/cmos into one device?
413    
 Clocks:  
         x)  General framework for automagic clock adjustment for _all_  
             kinds of clocks and timers. (Which should be possible to turn  
             off, of course, like the way DECstation emulation works now.)  
   
414  PCI:  PCI:
415          x)  last write was ffffffff ==> fix this, it should be used          x)  last write was ffffffff ==> fix this, it should be used
416              together with a mask to get the correct bits. also, not ALL              together with a mask to get the correct bits. also, not ALL
417              bits are size bits! (lowest 4 vs lowest 2?)              bits are size bits! (lowest 4 vs lowest 2?)
418          x)  add support for address fixups          x)  add support for address fixups
419          x)  generalize the interrupt routing stuff (lines etc). this should          x)  generalize the interrupt routing stuff (lines etc)
             be per machine? or per bus, that's better  
         x)  add a "pcn" NIC (AMD PCnet32 Lance 79c970 (PCI 1022:2000)),  
             could be useful for several machine modes (Malta, Algor, evbarm,  
             hp700?, macppc, etc.)  
   
 Network layer:  
         o)  DHCP (for Debian and BSD installers :-)  
         o)  increase performance  
         o)  don't rely on NetBSD-ish usage  
         o)  Multiple networks per emulation, and let different  
             NICs in machines connect to different networks.  
         o)  many other issues: see src/net.c  
420    
421  Busses:  Clocks and timers:
422          o)  Redesign the entire "mainbus" concept!          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
423          o)  Busses should be placed in a hierarchical tree!          x)  Test the 8253? Right now it doesn't seem to be used?
424          o)  Easily configurable interrupt routing in SMP systems.          x)  NetWinder timeofday is incorrect!
425          o)  Specific clock/bus speeds, cpu speeds etc.          x)  Cobalt TOD is incorrect!
426          o)  Synchronization over network? or at least in dyntrans within          x)  Go through all other machines, one by one, and fix them.
             one emulated machine  
         o)  dev->bus: TurboChannel, PCMCIA, ADB?  
427    
428  Config file parser:  Config file parser:
429          o)  Rewrite it from scratch!          o)  Rewrite it from scratch!
430          o)  Usage of any expression available through the debugger          o)  Usage of any expression available through the debugger
431            o)  Allow interrupt controllers to be added! and interrupts
432                to be used in more ways than before
433          o)  Support for running debugger commands (like the -c          o)  Support for running debugger commands (like the -c
434              command line option)              command line option)
435    
436  Floating point layer:  Floating point layer:
437          o)  make it common enough to be used by _all_ emulation modes          o)  make it common enough to be used by _all_ emulation modes
438          o)  implement more stuff          o)  implement correct error/exception handling and rounding modes
439            o)  implement more helper functions (i.e. add, sub, mul...)
440          o)  non-IEEE modes (i.e. x86)?          o)  non-IEEE modes (i.e. x86)?
441    
442  Userland emulation:  Userland emulation:
# Line 244  Userland emulation: Line 445  Userland emulation:
445    
446  Sound:  Sound:
447          x)  generic sound framework          x)  generic sound framework
448          x)  add one or more sound cards as devices          x)  add one or more sound cards as devices; add a testmachine
449                sound card first?
450            x)  Dreamcast sound? Generic PCI sound cards?
451    
452  ASC SCSI controller:  ASC SCSI controller:
453          x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul          x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul
454              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
455              in NetBSD itself, http://mail-index.netbsd.org/source-changes/              in NetBSD itself, http://mail-index.netbsd.org/source-changes/
456              2005/11/06/0024.html suggests that.)              2005/11/06/0024.html suggests that.)
457                NetBSD 4.x seems to work? :)
458    
459  Caches / memory hierarchies: (this is mostly MIPS-specific)  Caches / memory hierarchies: (this is mostly MIPS-specific)
         o)  MIPS coproc.c: bits in config registers should reflect  
             correct cache sizes for _all_ CPU types. (currently only  
             implemented for R4000, R1x000, and a few others)  
460          o)  src/memory*.c: Implement correct cache emulation for          o)  src/memory*.c: Implement correct cache emulation for
461              all CPU types. (currently only R2000/R3000 is implemented)              all CPU types. (currently only R2000/R3000 is implemented)
462              (per CPU, multiple levels should be possible,              (per CPU, multiple levels should be possible, associativity etc!)
             associativity etc!)  
463          o)  R2000/R3000 isn't _100%_ correct, just almost correct :)          o)  R2000/R3000 isn't _100%_ correct, just almost correct :)
464          o)  Move the -S (fill mem with random) functionality into the          o)  Move the -S (fill mem with random) functionality into the
465              memory.c subsystem, not machine.c or wherever it is now              memory.c subsystem, not machine.c or wherever it is now
# Line 273  Caches / memory hierarchies: (this is mo Line 473  Caches / memory hierarchies: (this is mo
473              possible.              possible.
474    
475  File/disk/symbol handling:  File/disk/symbol handling:
476          o)  Better handling of tape files          o)  Make sure that disks can be added/removed during runtime!
477                (Perhaps this needs a reasonably large re-write.)
478            o)  Remove some of the complexity in file format guessing, for
479                    Ultrix kernels that are actually disk images?
480            o)  Better handling of tape files      
481          o)  Read function argument count and types from binaries? (ELF?)          o)  Read function argument count and types from binaries? (ELF?)
482          o)  Better demangling of C++ names. Note: GNU's C++ differs from e.g.          o)  Better demangling of C++ names. Note: GNU's C++ differs from e.g.
483              Microsoft's C++, so multiple schemes must be possible. See              Microsoft's C++, so multiple schemes must be possible. See
# Line 282  File/disk/symbol handling: Line 486  File/disk/symbol handling:
486  Userland ABI emulation:  Userland ABI emulation:
487          o)  see src/useremul.c          o)  see src/useremul.c
488    
 Terminal/console:  
         o)  allow emulated serial ports to be connected to the outside  
             world in a more generic way, or even to other emulated  
             machines(?)  
   
 Save state of the whole emulated machine, to be able to load it back  
         in later?  (Memory, all device's states, all registers and  
         so on.  Like taking a snapshot. (SimOS seems to do this,  
         according to its website.))  
   
489  Better framebuffer and X-windows functionality:  Better framebuffer and X-windows functionality:
490            o)  Generalize the update_x1y1x2y2 stuff to an extend-region()
491                function...
492          o)  -Yx sometimes causes crashes.          o)  -Yx sometimes causes crashes.
493          o)  Simple device access to framebuffer_blockcopyfill() etc,          o)  Simple device access to framebuffer_blockcopyfill() etc,
494              and text output (using the built-in fonts), for dev_fb.              and text output (using the built-in fonts), for dev_fb.
# Line 303  Better framebuffer and X-windows functio Line 499  Better framebuffer and X-windows functio
499          o)  Non-resizable windows?  Or choose scaledown depending          o)  Non-resizable windows?  Or choose scaledown depending
500                  on size (and center the image, with a black border).                  on size (and center the image, with a black border).
501          o)  Different scaledown on different windows?          o)  Different scaledown on different windows?
502            o)  Non-integral scale-up? (E.g. 640x480 -> 1024x768)
503          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
504          o)  Bug reported by Elijah Rutschman on MacOS with weird          o)  Bug reported by Elijah Rutschman on MacOS with weird
505              keys (F5 = cursor down?).              keys (F5 = cursor down?).
# Line 316  Better framebuffer and X-windows functio Line 513  Better framebuffer and X-windows functio
513          o)  Generalize the framebuffer stuff by moving _ALL_ X11          o)  Generalize the framebuffer stuff by moving _ALL_ X11
514                  specific code to src/x11.c!                  specific code to src/x11.c!
515    
 Statistics:  (this could be interesting)  
         o)  Save to file and show graphics. It should be possible to  
             run gxemul after a simulation to just show the graphics,  
             or convert to a .ppm or .tga or similar.  
         o)  memory accesses (to measure cache efficiency and  
                 page coloring efficiency)  
         o)  nr of simultaneous ASIDs in use in the TLB, for MIPS  
         o)  percentage of time spent in different "states", such as  
             running userland code, kernel code, or idling (for CPUs  
             that have such an instruction, or whenever the PC is  
             inside a specific idle-function (address range)).  
             Possible additional state (for example on R3000): caches  
             disabled.  
         o)  position of read/write on (SCSI) disks  
   
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