/[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 32 by dpavlin, Mon Oct 8 16:20:58 2007 UTC revision 34 by dpavlin, Mon Oct 8 16:21:17 2007 UTC
# Line 1  Line 1 
1  $Id: TODO,v 1.410 2006/11/06 05:32:38 debug Exp $  $Id: TODO,v 1.453 2007/02/19 01:34:42 debug Exp $
2    
3  This file is my list of things I want to work on in the future. It is in  -------------------------------------------------------------------------------
 random order, and some parts of it are probably out-to-date by now.  
4    
5    Fix after the 0.4.4 release:
6            Fix the PowerPC DECR interrupt speed!
7    
8    -------------------------------------------------------------------------------
9    
10    Possible (relatively large) work packages to concentrate on in the future:
11    
12      x)  SMP:
13            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            Add better Test machine demos for SMP in the demos directory.
16    
17      x)  Network:
18            Redesign of the networking subsystem, at least the NAT translation
19            part. The current way of allowing raw ethernet frames to be
20            transfered to/from the emulator via UDP should probably be extended
21            to allow the frames to be transmitted other ways as well.
22            Also adding support for connecting ttys (either to xterms, or to
23            pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
24    
25      x)  PCI:
26            Pretty much everything related to runtime configuration, device
27            slots, interrupts, whatever. The current code is very hardcoded
28            and ugly.
29    
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    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:  Dyntrans:
47          x)  Instruction combination collisions? How to avoid easily...          x)  Instruction combination collisions? How to avoid easily...
# Line 36  Dyntrans: Line 75  Dyntrans:
75              (containing code)              (containing code)
76          x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)          x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
77          x)  Lots of other stuff: see src/cpus/README_DYNTRANS          x)  Lots of other stuff: see src/cpus/README_DYNTRANS
78          x)  true recompilation backend? think carefully about this,          x)  true recompilation backend? think carefully about this.
79              experiment in a separate project (not in GXemul)                  o)  abstract syntax for emitting opcopdes
80                  o) First test would be to just implement a simple                  o)  convert into native code only after an entire
81                     instruction such as MIPS' addiu or lui, on AMD64                          block has been translated? probably best.
82                     hosts...                  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?  Simple Valgrind-like checks?
88          o)  Mark every address with bits which tell whether or not the address          o)  Mark every address with bits which tell whether or not the address
# Line 86  MIPS: Line 128  MIPS:
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  SuperH:  SuperH:
         x)  DMA (0xffa00000)  
         x)  Instruction tracing should include symbols for branch targets,  
             and so on...  
143          x)  SH4 interrupt controller:          x)  SH4 interrupt controller:
144                  x)  Implement correct priorities of interrupts                  x)  Implement correct priorities of interrupts
145            x)  SH4 DMA (0xffa00000)
146            x)  SH4 UBC (0xff200000)
147            x)  Store queues can copy 32 bytes at a time, there's no need to
148                copy individual 32-bit words. (Performance improvement.)
149          x)  SH4 BSC (Bus State Controller)          x)  SH4 BSC (Bus State Controller)
150            x)  SH4 RTC: Read the host's clock.
151            x)  SH4 SCIF: Serial _interrupts_
152            x)  Instruction tracing should include symbols for branch targets,
153                and so on, to make the output more human readable.
154          x)  NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?          x)  NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?
155          x)  Replace pc-relative loads with immediate load, if within the          x)  Replace pc-relative loads with immediate load, if within the
156              same page. (Similar to the same optimization for ARM.)              same page. (Similar to the same optimization for ARM.)
         x)  Floating point exception correctness.  
157          x)  Floating point speed!          x)  Floating point speed!
158            x)  Floating point exception correctness.
159          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).
160    
161  Dreamcast:  Dreamcast:
162          x)  CD image bootup:          x)  G2 DMA
163                  0)  Find IP.BIN, and load it to 0x8c008000.          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
                 1)  Run code at 0x8c008300 (SEGA license code).  
                 2)  When the license code runs a "boot menu" syscall,  
                     load the 1ST_READ.BIN file (unscrambled?) to 0x8c010000.  
                 3)  Run code at 0x8c00b800 (Bootstrap 1). This will in turn  
                     jump to 0x8c00e000 (Bootstrap 2), and then jump to  
                     0x8c010000, to start the program.  
                 (Try with e.g. Comstedt's Serial IP Slave, to make sure it  
                 works as expected.)  
         x)  LAN adapter.  
164          x)  PVR:  Lots of stuff. See dev_pvr.c.          x)  PVR:  Lots of stuff. See dev_pvr.c.
165            x)  GDROM
166            x)  Modem
167            x)  PCI bridge/bus?
168          x)  Maple bus:          x)  Maple bus:
169                  x)  Correct controller input                  x)  Correct controller input
170                  x)  Mouse input                  x)  Mouse input
171          x)  PROM/BIOS calls:          x)  Software emulation of BIOS calls:
172                  x)  GD-ROM emulation                  x)  GD-ROM emulation: Use the GDROM device.
173          x)  NetBSD/dreamcast: Root on nfs?                  x)  Use the VGA font as a fake ROM font. (Better than
174                        nothing.)
175          x)  Linux/dreamcast? (The gentoo kernel currently crashes.)          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.          x)  More homebrew demos/games.
178          x)  Sound emulation (ARM cpu).          x)  SPU: Sound emulation (ARM cpu).
179          x)  VME processor emulation?          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:  Transputer:
185          x)  Implement support for Helios binaries.          x)  Implement support for Helios binaries.
# Line 170  Alpha: Line 223  Alpha:
223    
224  SPARC:  SPARC:
225          o)  Implement Adress space identifiers; load/stores 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)  Finish the subcc and addcc flag computation code.          o)  Finish the subcc and addcc flag computation code.
228          o)  Add more registers (floating point, control regs etc)          o)  Add more registers (floating point, control regs etc)
229          o)  Exception/trap handling.          o)  Exception/trap handling.
# Line 187  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)  Evaluate expressions within []? That would allow stuff like
244                    cpu[x] where x is an expression.
245          o)  Settings:          o)  Settings:
246                  x)  Special handlers for Write!                  x)  Special handlers for Write!
247                          +)  MIPS coproc regs                          +)  MIPS coproc regs
# Line 196  Debugger: Line 251  Debugger:
251          o)  see src/debugger.c for more          o)  see src/debugger.c for more
252    
253  POWER/PowerPC:  POWER/PowerPC:
254          x)  find and fix the bug which causes NetBSD/macppc to fail after          x)  Fix DECR timer speed, so it matches the host.
             an install!  
255          x)  NetBSD/prep 3.x triggers a possible bug in the emulator:          x)  NetBSD/prep 3.x triggers a possible bug in the emulator:
256              <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>              <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
257                <ata_get_xfer(0,0xd60cdd30,0,8,..)>                <ata_get_xfer(0,0xd60cdd30,0,8,..)>
# Line 221  POWER/PowerPC: Line 275  POWER/PowerPC:
275          x)  Floating point exception correctness.          x)  Floating point exception correctness.
276          x)  Alignment exceptions.          x)  Alignment exceptions.
277    
278    PReP:
279            Clock time! ("Bad battery blah blah")
280    
281  Algor:  Algor:
282          o)  Other models than the P5064?          o)  Other models than the P5064?
283          o)  PCI interrupts... needed for stuff like the tlp NIC?          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:  HPCmips:
291          x)  Mouse/pad support! :)          x)  Mouse/pad support! :)
292          x)  A NIC? (As a PCMCIA device?)          x)  A NIC? (As a PCMCIA device?)
# Line 232  HPCmips: Line 294  HPCmips:
294  AVR:  AVR:
295          o)  Everything.          o)  Everything.
296    
 AVR32:  
         o)  Everything. It would be good if there was NetBSD/avr32 to  
             experiment with...  
   
297  ARM:  ARM:
298          o)  See netwinder_reset() in NetBSD; the current "an internal error          o)  See netwinder_reset() in NetBSD; the current "an internal error
299              occured" message after reboot/halt is too ugly.              occured" message after reboot/halt is too ugly.
300          o)  ARM "wait"-like instruction?          o)  ARM "wait"-like instruction?
301          o)  try to get netbsd/evbarm 3.x running (iq80321)          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:  Test machines:
309          + dev_fb block fill and copy          o)  dev_fb block fill and copy
310          + dev_fb draw characters (from the built-in font)?          o)  dev_fb draw characters (from the built-in font)?
311          + dev_fb input device? mouse pointer coordinates and buttons          o)  dev_fb input device? mouse pointer coordinates and buttons
312                  (allow changes in these to cause interrupts as well?)                  (allow changes in these to cause interrupts as well?)
313          + Redefine the halt() function so that it stops "sometimes          o)  Redefine the halt() function so that it stops "sometimes
314            soon", i.e. usage in demo code should be:              soon", i.e. usage in demo code should be:
315                  for (;;) {                  for (;;) {
316                          halt();                          halt();
317                  }                  }
# Line 308  Documentation: Line 366  Documentation:
366                  securely".                  securely".
367          x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)          x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)
368          x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!          x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!
369          x)  DEVICE_TICK in technical.html          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          x)  Rewrite the section about experimental devices, after the
376              framebuffer acceleration has been implemented, and demos              framebuffer acceleration has been implemented, and demos
377              written. (Symbolic names instead of numbers; example              written. (Symbolic names instead of numbers; example
# Line 362  Clocks and timers: Line 425  Clocks and timers:
425          x)  Cobalt TOD is incorrect!          x)  Cobalt TOD is incorrect!
426          x)  Go through all other machines, one by one, and fix them.          x)  Go through all other machines, one by one, and fix them.
427    
 Busses:  
         o)  Redesign the entire "mainbus" concept!  
                 x)  Busses should be placed in a hierarchical tree (?)  
                 x)  Specific clock/bus speeds, cpu speeds etc.  
         o)  Interrupt routing subsystem:  
                 x)  IF POSSIBLE, try to make the new system work with the  
                     current system, but print annoying warning messages. :)  
                     Think carefully about this.  
                 x)  Registry for all available interrupts.  
                         +)  Each interrupt controller (including CPU cores  
                             that can handle interrupts) should register its  
                             interrupts, e.g.  
                                 cpu[0].irq[3]  
                                 cpu[0].irq[3].pcmcia_slot[1]  
                                 cpu[0].irq.pci[3]  
                         +)  Note: MIPS cpus have multiple irqs in the core,  
                             while some other CPUs only have one (irq[0]  
                             or just irq).  
                 x)  Users should use interrupt _names_ instead of integers  
                     when attaching to an interrupt controller, but when  
                     asserting/deasserting irq lines, small integers must  
                     still be used (for obvious performance reasons).  
                     Figure out a way to do this nicely!  
                 x)  Any users need to say whether they need the interrupt line  
                     exclusively or allow shared access.  
                 x)  Must work with everything from native IRQs to  
                     TurboChannel/PCI/ISA/ADB/PCMCIA/...  
                 x)  Must work with SMP emulation!  
                 x)  Make it with device_add(). How does the end user find  
                     out the name of an interrupt controller/line in e.g.  
                     a configuration file?  
         o)  Synchronization over network? or at least in dyntrans within  
             one emulated machine  
         o)  Convert to real busses: TurboChannel, PCMCIA, ADB  
   
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    
# Line 417  Sound: Line 447  Sound:
447          x)  generic sound framework          x)  generic sound framework
448          x)  add one or more sound cards as devices; add a testmachine          x)  add one or more sound cards as devices; add a testmachine
449              sound card first?              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
# Line 442  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)  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          o)  Remove some of the complexity in file format guessing, for
479                  Ultrix kernels that are actually disk images?                  Ultrix kernels that are actually disk images?
480          o)  Better handling of tape files          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 453  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()          o)  Generalize the update_x1y1x2y2 stuff to an extend-region()
491              function...              function...
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