/[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 23 by dpavlin, Mon Oct 8 16:19:37 2007 UTC revision 24 by dpavlin, Mon Oct 8 16:19:56 2007 UTC
# Line 1  Line 1 
1  $Id: TODO,v 1.209 2006/02/18 21:03:09 debug Exp $  $Id: TODO,v 1.292 2006/06/23 09:13:34 debug Exp $
2    
3  Hm. This file is in random order, and not all parts of it are up-to-date.  Hm. This file is in random order, and not all parts of it are up-to-date.
4    
5  Algor:  PCI and ISA and LOCAL interrupts! --> wdc could start working  --------------
6          Add interrupt controller in dev_algor.c.  
7    Possible release schedule:
8    
9    0.4.0:
10            x)  Quick release, even though performance for non-R3000 MIPS dyntrans
11                is really poor. (Assuming everything mentioned in the documentation
12                works as expected.)
13    
14    0.4.1:
15            x)  FIX THE NON-R3000 TRANSLATION CACHE INVALIDATION BOTTLENECKS!
16            x)  Fix the interrupt problems with Ultrix!
17            x)  Find/fix bug which is triggered when building the emulator inside
18                NetBSD/pmax 3.0 inside the emulator!
19    
20    0.4.2 ...?
21            x)  Clean-up!
22            x)  Clock framework? Go through all clock devices, make sure they
23                return correct data, and run at correct speeds!
24            x)  Optimizations, continuing on 64-bit issues etc with dyntrans
25            x)  Dyntrans with SMP... lots of work to be done here.
26            x)  Dyntrans with cache emulation... lots of work here as well.
27            x)  Actually use the settings object, better debugger stuff, etc.
28            x)  Wait for new releases of NetBSD, and test with those.
29    
30    --------------
31    
32    SMP:
33            o)  dev_mp doesn't work well with dyntrans yet
34            o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
35    
36    MIPS:
37            o)  Fix invalidate_asid so it works well for non-R3000 too!
38            x)  [Re]add an interrupt-asserted bit for MIPS, to speed up
39                interrupt handling slightly?
40            +)  Print a warning on the first reserved instruction.
41            +)  Some more work on opcodes.
42                    x) MIPS64 revision 2.
43                    x) _MAYBE_ TX79 and R5900 actually differ in their
44                       opcodes? Check this carefully!
45            o)  Dyntrans: Count register updates are probably not 100% correct yet.
46            o)  Dyntrans: SMP correctness
47            o)  Refactor code for performance and readability/maintainability.
48            o)  Instruction combinations? Possible candidates (but profile first!):
49                    o)  multiple loads/stores in a row
50                    o)  strlen, memset loops etc
51                    o)  compare + branch
52            o)  DROTR32 and similar MIPS64 rev 2 instructions, which have
53                a rotation bit which differs from previous ISAs.
54            o)  EI and DI instructions for MIPS64/32 rev 2. NOTE: These are
55                _NOT_ the same as for R5900!
56            o)  R4000 and others:
57                    x)  watchhi/watchlo exceptions, and other exception
58                        handling details
59            o)  R10000 and others:  (R12000, R14000 ?)
60                    x)  memory space, exceptions, ...
61                    x)  use cop0 framemask for tlb lookups
62                        (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)
63    
64  Dyntrans:  Dyntrans:
65          TOP Priority:          x)  Move the mips_init_64bit_dummy_tables() etc calls into
66                  x)  64-bit stuff: good generic virtual memory translation, and              src/cpu.c, for all 64-bit cpus?
67                      other structures. not all 64 bits need to be used          x)  64-bit "phystranslation" lookup as in 32-bit mode? Would probably
68                      (e.g. Alpha)                  help performance a bit.
69                  x)  Delay slots!          x)  Common fatal_abort() function, which drops into the debugger
70                  x)  Old MIPS -> dyntrans!                  without continuing.
         Other stuff:  
71          x)  INVALIDATION should cause translations in _all_ cpus to be          x)  INVALIDATION should cause translations in _all_ cpus to be
72              invalidated, e.g. on a write to a write-protected page              invalidated, e.g. on a write to a write-protected page
73              (containing code)              (containing code)
74          x)  Think about sharing code between CPUs of the same          x)  better (formally defined) instr call statistics (-s command
75              arch/bitlength/endianness (the translation caches).              line option?), multiple different types? (virtual pc, physical pc)
             (Eg. a little-endian R4000 and a little-endian R5000 could  
             share code, but not an R3000 and an R4000.)  
         x)  better (meaningful) instr call statistics  
76          x)  Call/return hints?          x)  Call/return hints?
77          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)
78          x)  PPC optimizations; instr combs          x)  H8?
         x)  Alpha  
         x)  SPARC  
         x)  PPC (64-bit stuff)  
79          x)  Lots of other stuff: see src/cpus/README_DYNTRANS          x)  Lots of other stuff: see src/cpus/README_DYNTRANS
80          x)  true recompilation backend? think carefully about this,          x)  true recompilation backend? think carefully about this,
81              experiment in a separate project (not in GXemul)              experiment in a separate project (not in GXemul)
82            x)  Remove the dyntrans_alignment_check functionality; although
83                it gives slightly higher peformance sometimes, it increases
84                the complexity of the code too much!
85    
86    Alpha:
87            o)  Virtual memory (tlbs etc)
88            o)  Get {NetBSD,OpenBSD,Linux}/alpha booting. :)
89    
90    SPARC:
91            o)  Add all registers (floating point, control regs etc)
92            o)  Save/restore register windows etc!
93            o)  Disassemly of some more instructions.
94            o)  Are sll etc 32-bit sign-extending or zero-extending?
95            o)  Finish the cmp (subcc) flag computation code.
96            o)  Finish the GDB register stuff.
97    
98    Debugger:
99            o)  How does SMP debugging work? Does it simply use "threads"?
100                    What if the guest OS (running on an emulated SMP machine)
101                    has a usertask running, with userland threads?
102            o)  Try to make the debugger more modular and, if possible, reentrant!
103            o)  Remove the emul command? (But show network info if showing
104                    machines?)
105            o)  Generalize the expression evaluator. (debugger_expr.c?)
106                    settable variables      ("show nr of instructions on average")
107                    emul[x]                 defaults to current emul
108                    machine[x]              defaults to current machine
109                    cpu[x]                  defaults to currently focused cpu
110                    registers               cpu arch dependent (#-prefix)
111                    symbols                 @-prefix
112                    numeric constants       decimal, hex, and octal ($-prefix)
113                    boolean                 yes,no, true,false
114                    operators (+ - * / % & | ^ !)
115                    parentheses for grouping subexpressions
116                    NOTE: the change from % to # for register prefix!
117                    examples:
118                                    emul[0].machine[2].cpu[0].pc
119                                    machine[test2].cpu[1].ra = main
120                                    settings.show_trace_tree = yes
121    
122                    Settings:
123                            o)  Remove a setting.
124                            o)  Read/write a setting given a name. (Read as
125                                string and/or int64_t simultaneously?)
126    
127                    Help command should have subsections! One for "expressions",
128                    mirrored in the documentation, but the internal help should
129                    be the one that should be considered correct.
130            o)  see src/debugger.c for more
131    
132    POWER/PowerPC:
133            x)  PPC optimizations; instr combs
134            x)  64-bit stuff
135            x)  find and fix the bug which causes NetBSD/macppc to fail after
136                an install!
137            x)  macppc: adb controller; keyboard (for framebuffer mode)
138            x)  make OpenBSD/macppc work (PCI controller stuff)
139    
140    Algor:
141            PCI and ISA and LOCAL interrupts! --> wdc could start working
142            Add interrupt controller in dev_algor.c.
143    
144    ARM:
145            o)  try to get netbsd/evbarm 3.x running (iq80321)
146            o)  make the xscale counter registers (ccnt) work
147            o)  make the ata controller usable for FreeBSD!
148            o)  zaurus for openbsd...
149            o)  debian/cats crashes because of unimplemented coproc stuff.
150                fix this?
151    
152    Cache simulation:
153            o)  Separate from the CPU concept, so that multi-core CPUs sharing
154                e.g. a L2 cache can be simulated (?)
155            o)  Instruction cache emulation is easiest (if separate from the
156                data cache); similar hack as the S;I; hack in cpu_dyntrans.c.
157                NOTE: if the architecture has a delay slot, then an instruction
158                slot can actually be executed as 2 instructions.
159            o)  Data cache emulation = harder; each arch's load/store routines
160                must include support? running one instruction at a time and
161                having a cpu-dependant lookup function for each instruction
162                is another option (easier to implement, but very very slow).
163    
164    Documentation:
165            o)  machines, cpus, devices.
166            o)  Automagic documentation generation:
167                    x)  REMEMBER that several machines/devices can be in
168                            the same source file!
169            o)  Try to rewrite the install instructions for those machines
170                that use 3MAX into using CATS? (To remove the need to a raw
171                ffs partition using up all of the disk image.)
172    
173  More generic out_of_memory error reporting, and check everywhere!  More generic out_of_memory error reporting, and check everywhere!
174          Causes: OpenBSD has low default limits for normal users.          Causes: OpenBSD has low default limits for normal users.
# Line 51  The Device subsystem: Line 190  The Device subsystem:
190          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
191              minimum size, etc, or up to a max size)              minimum size, etc, or up to a max size)
192          x)  keep track of interrupts and busses? actually, allowing any device          x)  keep track of interrupts and busses? actually, allowing any device
193              to be a bus might be a nice idea              to be a bus might be a nice idea.
194            x)  turn interrupt controllers into devices? :-)
195          x)  refactor various clocks/nvram/cmos into one device?          x)  refactor various clocks/nvram/cmos into one device?
196    
197  ARM:  Clocks:
198          o)  add ID for "i80321 600MHz rev 2 (XScale core)"          x)  General framework for automagic clock adjustment for _all_
199          o)  make the ata controller usable for FreeBSD!              kinds of clocks and timers. (Which should be possible to turn
200          x)  zaurus for openbsd...              off, of course, like the way DECstation emulation works now.)
201    
202  PCI:  PCI:
203            x)  last write was ffffffff ==> fix this, it should be used
204                together with a mask to get the correct bits. also, not ALL
205                bits are size bits! (lowest 4 vs lowest 2?)
206          x)  add support for address fixups          x)  add support for address fixups
207          x)  generalize the interrupt routing stuff (lines etc). this should          x)  generalize the interrupt routing stuff (lines etc). this should
208              be per machine? or per bus, that's better              be per machine? or per bus, that's better
209            x)  add a "pcn" NIC (AMD PCnet32 Lance 79c970 (PCI 1022:2000)),
210  MacPPC:              could be useful for several machine modes (Malta, Algor, evbarm,
211          x)  dev_zs / interrupts?              hp700?, macppc, etc.)
         x)  adb controller; keyboard  
         x)  make OpenBSD/macppc work (PCI controller stuff)  
212    
213  Network layer:  Network layer:
214          o)  DHCP (for Debian and BSD installers :-)          o)  DHCP (for Debian and BSD installers :-)
# Line 87  Busses: Line 228  Busses:
228          o)  dev->bus: TurboChannel, PCMCIA, ADB?          o)  dev->bus: TurboChannel, PCMCIA, ADB?
229    
230  Config file parser:  Config file parser:
231          o)  Refresh/rewrite it :)          o)  Rewrite it from scratch!
232          o)  Usage of any expression available through the debugger          o)  Usage of any expression available through the debugger
         o)  Expressions such as "add device" would be nice to be able  
             to do on the command line manually.  
         o)  Allow machine() entries even if there is no emul() entry (but  
             then don't allow any emul() entries at all).  
233          o)  Support for running debugger commands (like the -c          o)  Support for running debugger commands (like the -c
234              command line option)              command line option)
235    
236  Floating point layer:  Floating point layer:
237          o)  make it common enough to be used by _all_ emulation modes          o)  make it common enough to be used by _all_ emulation modes
238            o)  implement more stuff
239          o)  non-IEEE modes (i.e. x86)?          o)  non-IEEE modes (i.e. x86)?
240    
241  Userland emulation:  Userland emulation:
# Line 108  Sound: Line 246  Sound:
246          x)  generic sound framework          x)  generic sound framework
247          x)  add one or more sound cards as devices          x)  add one or more sound cards as devices
248    
249    ASC SCSI controller:
250            x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul
251                cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
252                in NetBSD itself, http://mail-index.netbsd.org/source-changes/
253                2005/11/06/0024.html suggests that.)
254    
255  Caches / memory hierarchies: (this is mostly MIPS-specific)  Caches / memory hierarchies: (this is mostly MIPS-specific)
256          o)  MIPS coproc.c: bits in config registers should reflect          o)  MIPS coproc.c: bits in config registers should reflect
257              correct cache sizes for _all_ CPU types. (currently only              correct cache sizes for _all_ CPU types. (currently only
# Line 128  Caches / memory hierarchies: (this is mo Line 272  Caches / memory hierarchies: (this is mo
272              memory latencies should be emulated as correctly as              memory latencies should be emulated as correctly as
273              possible.              possible.
274    
 MIPS CPU emulation:  (note: this is for the OLD mips stuff)  
         o)  i386 bintrans backend: movn etc, slt[u] for  
                 64-bit mode, 64-bit shifts etc  
         o)  Instructions:  
                 o)  All ISAs:  
                         o)  Floating point exception handling, and  
                                 add more instructions.  
                         o)  Finish the MIPS16 translator, and test it!  
                         o)  MIPS ISA I, II, III, IV  
                         o)  MIPS V (SIMD vector stuff?)  
                         o)  MDMX  (MIPS Digital Media Extension)  
                         o)  MIPS 3D  
                         o)  MIPS MT (Multi-thread stuff) (What's this?)  
                 o)  Warn about mis-used bit fields (ie bits that  
                     should be all zeroes, warn about if they are not)!  
                     Both for coprocessor registers and for instruction  
                     opcodes.  
                 o)  the special2 stuff is a mess right now  
                 o)  warn and/or cause exceptions for unimplemented  
                     instructions (depending on CPU type)  
         o)  R2000/R3000:  
                 x)  R3000 "tri-byte stores". (What's this?)  
         o)  R4000 and others:  
                 x)  watchhi/watchlo exceptions, and other exception  
                     handling details  
         o)  R10000 and others:  (R12000, R14000 ?)  
                 x)  memory space, exceptions, ...  
                 x)  use cop0 framemask for tlb lookups  
                     (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)  Implement load delays?  Warnings on interlocks.  
         o)  Implement all coprocessor 0 bits / functions.  
                 x)  coproc 0 selectors! (R4000 ?)  
         o)  R4300 (nintendo64, no mmu?), R5900 (playstation2, weird  
                 TLB/cache? 128-bit GPRs, new instructions),  
                 4K (note: NOT R4000), 5K (note: NOT R5000),  
                 R6000 (ISA II), R8000  
         o)  Multi-cpu stuff:  
                 +)  Interrupt routing (ie devices vs mainbus, or  
                     connect each device to a fixed cpu)  
                 +)  SGI's NUMA architecture. Study  
                         x)  Linux sources  
                         x)  SGI's specs on NUMA address space  
                 +)  Ultrix?  NetBSD doesn't do SMP on MIPS yet :-(  
                 +)  Own experiments with ycx2.  
   
275  File/disk/symbol handling:  File/disk/symbol handling:
276          o)  Better handling of tape files          o)  Better handling of tape files
277          o)  Read function argument count and types from binaries? (ELF?)          o)  Read function argument count and types from binaries? (ELF?)
278          o)  Demangle C++ names.          o)  Better demangling of C++ names. Note: GNU's C++ differs from e.g.
279                Microsoft's C++, so multiple schemes must be possible. See
280  Debugger:              URL at top of src/symbol_demangle.c for more info.
         o)  see src/debugger.c for more  
281    
282  Userland ABI emulation:  Userland ABI emulation:
283          o)  see src/useremul.c          o)  see src/useremul.c
# Line 206  Better framebuffer and X-windows functio Line 304  Better framebuffer and X-windows functio
304                  on size (and center the image, with a black border).                  on size (and center the image, with a black border).
305          o)  Different scaledown on different windows?          o)  Different scaledown on different windows?
306          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
307            o)  Bug reported by Elijah Rutschman on MacOS with weird
308                keys (F5 = cursor down?).
309          o)  Keyboard and mouse events:          o)  Keyboard and mouse events:
310                  x)  Do this for more machines than just DECstation                  x)  Do this for more machines than just DECstation
311                  x)  more X11 cursor keycodes                  x)  more X11 cursor keycodes
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