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$Id: TODO,v 1.292 2006/06/23 09:13:34 debug Exp $ |
$Id: TODO,v 1.464 2007/03/16 14:13:59 debug Exp $ |
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Hm. This file is in random order, and not all parts of it are up-to-date. |
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-------------- |
Landisk SH4: |
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HITTA OCH FIXA SH4-STABILITETSPROBLEMEN! |
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SH4 RTC, läs värdmaskinens klocka. |
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När NetBSD 4.0 och OpenBSD 4.1 kommit ut, uppdatera |
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installationsinstruktionerna i dokumentationen, flytta upp till |
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supportat OS (guestos & index). |
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Lägg till landisk i emulated machines i intro.html. |
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Sätt machine_landisk stable = 1, om/när allt funkar. |
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Add a special function to the testmachine devices, console perhaps? |
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which prints a zero-terminated string like "[[ %s ]]\n" when given |
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a virtual memory address (or a physical? or perhaps both should be possible). |
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o) NOT to the console, but to the emulator's controlling terminal. |
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DEBUG output, not console output! |
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o) Very useful for debugging. DOCUMENT it! |
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Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.) |
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Prova att installera GNU Linux/DECstation _UTAN_ |
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slow_serial_interrupts_hack_for_linux! Det kanske funkar med |
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nya interruptsystemet? |
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------------------------------------------------------------------------------- |
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Possible (relatively large) work packages to concentrate on in the future: |
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x) SMP: |
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Get SMP working again. It is pretty much broken since I started |
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the conversion from the old bintrans system to the new dyntrans system. |
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Add better Test machine demos for SMP in the demos directory. |
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Either multiple dev_mp (one per cpu), or the single dev_mp must |
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_really_ keep all per-cpu values separate. |
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x) Alpha and SPARC emulation: |
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These are the next two CPU/machine families that I want to emulate. |
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x) Network: |
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Redesign of the networking subsystem, at least the NAT translation |
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part. The current way of allowing raw ethernet frames to be |
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transfered to/from the emulator via UDP should probably be extended |
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to allow the frames to be transmitted other ways as well. |
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Also adding support for connecting ttys (either to xterms, or to |
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pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-). |
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Documentation updates (!) are very important, making it easier to |
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use the (already existing) network emulation features. |
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x) PCI: |
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Pretty much everything related to runtime configuration, device |
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slots, interrupts, whatever. The current code is very hardcoded |
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and ugly. |
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o) Allow cards to be added/removed during runtime more easily. |
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o) Allow cards to be enabled/disabled (i/o ports, etc, like |
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NetBSD needs for disk controller detection). |
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o) Allow devices to be moved in memory during runtime. |
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o) Interrupts per PCI slot, etc. (A-D). |
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o) PCI interrupt controller logic... very hard to get right, |
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because these differ a lot from one machine to the next. |
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x) Debugging: |
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Think more about SMP debugging, etc. Right now, the |
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debugger is a mess. Also, a better connection to GDB would be |
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very nice to have. |
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x) Userland emulation: |
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Primary goals would be NetBSD and Linux syscall emulation. |
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x) Variable-length ISA support: |
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The support for emulation of variable length ISAs (such as |
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M68K, AMD64/i386, or AVR32) is not really there yet. It would |
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be very fun to work on this, to get it right. |
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x) Native code generation backends. |
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Not necessary to have the emulator working, but speed is |
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always nice to have. |
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x) Remove all "addr mult" device support! |
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Long term goal. Replace the current hacks with address |
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multiplication _per device_ with layered devices, so that the |
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end device (wdc, ns16550, whatever) only supports one access |
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style, and the layers in between convert to 16/32/64-bit |
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word alignment. |
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Possible release schedule: |
And of course, there are _LOTS_ of minor TODOs spread out throughout |
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the source code, which must be fixed sooner or later. |
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0.4.0: |
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x) Quick release, even though performance for non-R3000 MIPS dyntrans |
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is really poor. (Assuming everything mentioned in the documentation |
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works as expected.) |
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0.4.1: |
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x) FIX THE NON-R3000 TRANSLATION CACHE INVALIDATION BOTTLENECKS! |
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x) Fix the interrupt problems with Ultrix! |
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x) Find/fix bug which is triggered when building the emulator inside |
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NetBSD/pmax 3.0 inside the emulator! |
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0.4.2 ...? |
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x) Clean-up! |
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x) Clock framework? Go through all clock devices, make sure they |
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return correct data, and run at correct speeds! |
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x) Optimizations, continuing on 64-bit issues etc with dyntrans |
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x) Dyntrans with SMP... lots of work to be done here. |
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x) Dyntrans with cache emulation... lots of work here as well. |
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x) Actually use the settings object, better debugger stuff, etc. |
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x) Wait for new releases of NetBSD, and test with those. |
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-------------- |
Some other things, in random order, that I'd like to fix: (Some items in |
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this list are probably out-to-date by now.) |
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SMP: |
Dyntrans: |
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x) Instruction combination collisions? How to avoid easily... |
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x) Think about how to do both SHmedia and SHcompact in a reasonable |
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way! (Or AMD64 long/protected/real, for that matter.) |
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x) 68K emulation; think about how to do variable instruction |
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lengths across page boundaries. |
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x) Dyntrans with valgrind-inspired memory checker. (In memory_rw, |
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it would be reasonably simple to add; in each individual fast |
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load/store routine = a lot more work, and it would become |
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kludgy very fast.) |
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x) Dyntrans with SMP... lots of work to be done here. |
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x) Dyntrans with cache emulation... lots of work here as well. |
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x) Remove the concept of base RAM completely; it would be more |
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generic to allow RAM devices to be used "anywhere". |
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o) dev_mp doesn't work well with dyntrans yet |
o) dev_mp doesn't work well with dyntrans yet |
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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 |
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x) Redesign/rethink the delay slot mechanism used for e.g. MIPS, |
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so that it caches a translation (that is, an instruction |
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word and the instr_call it was translated to the last |
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time), so that it doesn't need to do slow |
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to_be_translated for each end of page? |
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x) Program Counter statistics: |
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Per machine? What about SMP? All data to the same file? |
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A debugger command should be possible to use to enable/ |
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disable statistics gathering. |
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Configuration file option! |
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x) Breakpoints: |
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o) Physical vs virtual addresses! |
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o) 32-bit vs 64-bit sign extension for MIPS, and others? |
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x) INVALIDATION should cause translations in _all_ cpus to be |
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invalidated, e.g. on a write to a write-protected page |
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(containing code) |
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x) 16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64) |
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x) Lots of other stuff: see src/cpus/README_DYNTRANS |
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x) true recompilation backend? think carefully about this. |
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o) abstract syntax for emitting opcopdes |
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o) convert into native code only after an entire |
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block has been translated? probably best. |
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o) x86/amd64 code generator can be very similar... perhaps |
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o) branches to already translated code blocks can |
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link the blocks together |
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o) load/store are the most important. |
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Simple Valgrind-like checks? |
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o) Mark every address with bits which tell whether or not the address |
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has been written to. |
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o) What should happen when programs are loaded? Text/data, bss (zero |
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filled). But stack space and heap is uninitialized. |
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o) Uninitialized local variables: |
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A load from a place on the stack which has not previously |
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been stored to => warning. Increasing the stack pointer using |
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any available means should reset the memory to uninitialized. |
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o) If calls to malloc() and free() can be intercepted: |
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o) Access to a memory area after free() => warning. |
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o) Memory returned by malloc() is marked as not-initialized. |
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o) Non-passive, but good to have: Change the argument |
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given to malloc, to return a slightly larger memory |
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area, i.e. margin_before + size + margin_after, |
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and return the pointer + margin_before. |
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Any access to the margin_before or _after space results |
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in warnings. (free() must be modified to free the |
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actually allocated address.) |
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MIPS: |
MIPS: |
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o) Fix invalidate_asid so it works well for non-R3000 too! |
o) Nicer MIPS status bits in register dumps. |
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x) [Re]add an interrupt-asserted bit for MIPS, to speed up |
o) Alignment exceptions. |
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interrupt handling slightly? |
o) Floating point exception correctness. |
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+) Print a warning on the first reserved instruction. |
o) Fix this? Triggered by NetBSD/sgimips? Hm: |
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+) Some more work on opcodes. |
to_be_translated(): TODO: unimplemented instruction: |
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000000000065102c: 00200800 (d) rot_00 at,zr,0 |
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o) Some more work on opcodes. |
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x) MIPS64 revision 2. |
x) MIPS64 revision 2. |
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o) Find out which actual CPUs implement the rev2 ISA! |
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o) DROTR32 and similar MIPS64 rev 2 instructions, |
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which have a rotation bit which differs from |
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previous ISAs. |
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o) EI and DI instructions for MIPS64/32 rev 2. |
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NOTE: These are _NOT_ the same as for R5900! |
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x) _MAYBE_ TX79 and R5900 actually differ in their |
x) _MAYBE_ TX79 and R5900 actually differ in their |
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opcodes? Check this carefully! |
opcodes? Check this carefully! |
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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 |
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o) Refactor code for performance and readability/maintainability. |
o) Refactor code for performance and readability/maintainability. |
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o) Instruction combinations? Possible candidates (but profile first!): |
o) (Re)implement 128-bit loads/stores for R5900. |
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o) multiple loads/stores in a row |
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o) strlen, memset loops etc |
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o) compare + branch |
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o) DROTR32 and similar MIPS64 rev 2 instructions, which have |
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a rotation bit which differs from previous ISAs. |
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o) EI and DI instructions for MIPS64/32 rev 2. NOTE: These are |
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_NOT_ the same as for R5900! |
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o) R4000 and others: |
o) R4000 and others: |
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x) watchhi/watchlo exceptions, and other exception |
x) watchhi/watchlo exceptions, and other exception |
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handling details |
handling details |
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o) R10000 and others: (R12000, R14000 ?) |
o) R10000 and others: (R12000, R14000 ?) |
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x) The code before the line |
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/* reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK; */ |
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in cpu_mips.c is not correct for R10000 according to |
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Lemote's Godson patches for GXemul. TODO: Go through all |
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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 |
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and make sure everything works with R10000. |
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Then test with OpenBSD/sgi? |
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x) Entry LO mask (as above). |
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x) memory space, exceptions, ... |
x) memory space, exceptions, ... |
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x) use cop0 framemask for tlb lookups |
x) use cop0 framemask for tlb lookups |
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(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) |
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Dyntrans: |
SuperH: |
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x) Move the mips_init_64bit_dummy_tables() etc calls into |
x) SH4 interrupt controller: |
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src/cpu.c, for all 64-bit cpus? |
x) Implement correct priorities of interrupts |
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x) 64-bit "phystranslation" lookup as in 32-bit mode? Would probably |
x) SH4 DMA (0xffa00000) |
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help performance a bit. |
x) SH4 UBC (0xff200000) |
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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 |
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without continuing. |
copy individual 32-bit words. (Performance improvement.) |
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x) INVALIDATION should cause translations in _all_ cpus to be |
x) SH4 BSC (Bus State Controller) |
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invalidated, e.g. on a write to a write-protected page |
x) SH4 RTC: Read the host's clock. |
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(containing code) |
x) Instruction tracing should include symbols for branch targets, |
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x) better (formally defined) instr call statistics (-s command |
and so on, to make the output more human readable. |
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line option?), multiple different types? (virtual pc, physical pc) |
x) NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux? |
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x) Call/return hints? |
x) Replace pc-relative loads with immediate load, if within the |
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x) 16-bit encodings? (MIPS16, ARM Thumb, SH3, ...) |
same page. (Similar to the same optimization for ARM.) |
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x) H8? |
x) Floating point speed! |
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x) Lots of other stuff: see src/cpus/README_DYNTRANS |
x) Floating point exception correctness. |
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x) true recompilation backend? think carefully about this, |
x) Think carefully about how to implement SH5/SH64 (for evbsh5). |
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experiment in a separate project (not in GXemul) |
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x) Remove the dyntrans_alignment_check functionality; although |
Dreamcast: |
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it gives slightly higher peformance sometimes, it increases |
x) G2 DMA |
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the complexity of the code too much! |
x) LAN adapter (dev_mb8696x.c). NetBSD root-on-nfs. |
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x) PVR: Lots of stuff. See dev_pvr.c. |
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x) GDROM |
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x) Modem |
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x) PCI bridge/bus? |
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x) Maple bus: |
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x) Correct controller input |
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x) Mouse input |
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x) Software emulation of BIOS calls: |
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x) GD-ROM emulation: Use the GDROM device. |
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x) Use the VGA font as a fake ROM font. (Better than |
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nothing.) |
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x) Linux/dreamcast? (The gentoo kernel currently crashes.) |
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x) Make as many as possible of the KOS examples run! |
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x) More homebrew demos/games. |
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x) SPU: Sound emulation (ARM cpu). |
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x) VME processor emulation? "(Sanyo LC8670 "Potato")" according to |
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Wikipedia, LC86K87 according to Comstedt's page. See |
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http://www.maushammer.com/vmu.html for a good description of |
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the differences between LC86104C and the one used in the VME. |
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Transputer: |
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x) Implement support for Helios binaries. |
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x) Stack and register contents at startup? |
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x) Figure out how to boot an entire Helios distribution. |
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x) Implement all instructions. :) |
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RCA1802/RCA1805, CHIP8: |
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x) CHIP8 -> RCA180x conversion |
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x) Think about how to do dual-mode, variable-instr-length |
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ISAs, and switch between modes. |
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x) 1805 "extended" opcode -> trigger CHIP8 emulation? |
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That is, all calls 0NNN could point to 0x68 opcodes, |
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which, if running on a 1802 in CHIP8-emulation-mode, |
| 248 |
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would be manually interpreted. |
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x) Better solution: |
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CHIP8 calls to 00xx => handle at high level, |
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calls to 0xxx in general = call 180X machine code |
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(0000 = reboot?) |
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x) 1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html |
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and: http://www.elf-emulation.com/1802.html |
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x) 1805 extended opcodes: Implement at least disassembly support! |
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x) Keyboard input. |
| 257 |
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x) Sound (beep only). |
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x) Slow-down to correct speed? Wikipedia: "it was usually operated |
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at 3.58 MHz/2 to suit the requirements of the 1861 chip which |
| 260 |
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gave a speed of a little over 100,000 instructions per second" |
| 261 |
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(Note that _CHIP8_ emulation would then be even slower.) |
| 262 |
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x) SCHIP48 (Super) emulation: |
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Some more opcodes, 128x64 framebuffer, larger |
| 264 |
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sprites and fonts. |
| 265 |
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Alpha: |
Alpha: |
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o) Virtual memory (tlbs etc) |
x) OSF1 PALcode, Virtual memory support. |
| 268 |
o) Get {NetBSD,OpenBSD,Linux}/alpha booting. :) |
x) PALcode replacement! PAL1E etc opcodes...? |
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x) Interrupt/exception/trap handling. |
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x) Floating point exception correctness. |
| 271 |
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x) More work on bootup memory and register contents. |
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x) More Alpha machine types, so it could work with |
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OpenBSD, FreeBSD, and Linux too? |
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SPARC: |
SPARC: |
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o) Add all registers (floating point, control regs etc) |
o) Implement Adress space identifiers; load/stores etc. |
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o) Save/restore register windows etc! |
o) Save/restore register windows etc! Both v9 and pre-v9! |
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o) Disassemly of some more instructions. |
o) Finish the subcc and addcc flag computation code. |
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o) Add more registers (floating point, control regs etc) |
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o) Exception/trap handling. |
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o) Disassemly of some more instructions? |
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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. |
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o) Finish the GDB register stuff. |
o) Finish the GDB register stuff. |
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x) Floating point exception correctness. |
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o) SPARC v8, v7 etc? |
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Debugger: |
Debugger: |
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o) How does SMP debugging work? Does it simply use "threads"? |
o) How does SMP debugging work? Does it simply use "threads"? |
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o) Try to make the debugger more modular and, if possible, reentrant! |
o) Try to make the debugger more modular and, if possible, reentrant! |
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o) Remove the emul command? (But show network info if showing |
o) Remove the emul command? (But show network info if showing |
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machines?) |
machines?) |
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o) Generalize the expression evaluator. (debugger_expr.c?) |
o) Evaluate expressions within []? That would allow stuff like |
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settable variables ("show nr of instructions on average") |
cpu[x] where x is an expression. |
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emul[x] defaults to current emul |
o) Settings: |
| 297 |
machine[x] defaults to current machine |
x) Special handlers for Write! |
| 298 |
cpu[x] defaults to currently focused cpu |
+) MIPS coproc regs |
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registers cpu arch dependent (#-prefix) |
+) Alpha/MIPS/SPARC zero registers |
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symbols @-prefix |
+) x86 64/32/16-bit registers |
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numeric constants decimal, hex, and octal ($-prefix) |
x) Value formatter for resulting output. |
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boolean yes,no, true,false |
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operators (+ - * / % & | ^ !) |
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parentheses for grouping subexpressions |
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NOTE: the change from % to # for register prefix! |
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examples: |
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emul[0].machine[2].cpu[0].pc |
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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. |
|
| 302 |
o) see src/debugger.c for more |
o) see src/debugger.c for more |
| 303 |
|
|
| 304 |
POWER/PowerPC: |
POWER/PowerPC: |
| 305 |
|
x) Fix DECR timer speed, so it matches the host. |
| 306 |
|
x) NetBSD/prep 3.x triggers a possible bug in the emulator: |
| 307 |
|
<wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)> |
| 308 |
|
<ata_get_xfer(0,0xd60cdd30,0,8,..)> |
| 309 |
|
<0x26c550(&ata_xfer_pool,2,0,8,..)> |
| 310 |
|
<0x35c71c(0x3f27000,0,52,8,..)> |
| 311 |
|
<ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)> |
| 312 |
|
<atastart(0xd005e4c8,0x3f27000,0,13,..)> |
| 313 |
|
<__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)> |
| 314 |
|
<bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)> |
| 315 |
|
[ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ] |
| 316 |
|
<wdcwait(0xd005e4c8,72,64,0xbb8,..)> |
| 317 |
|
<0x198120(0xd005e4c8,72,64,0xbb8,..)> |
| 318 |
|
<bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)> |
| 319 |
|
<delay(100,0,0,0xbb8,..)> |
| 320 |
|
Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)> |
| 321 |
x) PPC optimizations; instr combs |
x) PPC optimizations; instr combs |
| 322 |
x) 64-bit stuff |
x) 64-bit stuff: either Linux on G5, or perhaps some hobbyist |
| 323 |
x) find and fix the bug which causes NetBSD/macppc to fail after |
version of AIX? (if there exists such a thing) |
|
an install! |
|
| 324 |
x) macppc: adb controller; keyboard (for framebuffer mode) |
x) macppc: adb controller; keyboard (for framebuffer mode) |
| 325 |
x) make OpenBSD/macppc work (PCI controller stuff) |
x) make OpenBSD/macppc work (PCI controller stuff) |
| 326 |
|
x) Floating point exception correctness. |
| 327 |
|
x) Alignment exceptions. |
| 328 |
|
|
| 329 |
|
PReP: |
| 330 |
|
Clock time! ("Bad battery blah blah") |
| 331 |
|
|
| 332 |
Algor: |
Algor: |
| 333 |
PCI and ISA and LOCAL interrupts! --> wdc could start working |
o) Other models than the P5064? |
| 334 |
Add interrupt controller in dev_algor.c. |
o) PCI interrupts... needed for stuff like the tlp NIC? |
| 335 |
|
|
| 336 |
|
BeBox: |
| 337 |
|
o) Interrupts. There seems to be a problem with WDC interrupts |
| 338 |
|
"after a short while", although a few interrupts get through? |
| 339 |
|
o) Perhaps find a copy of BeOS and try it? |
| 340 |
|
|
| 341 |
|
HPCmips: |
| 342 |
|
x) Mouse/pad support! :) |
| 343 |
|
x) A NIC? (As a PCMCIA device?) |
| 344 |
|
|
| 345 |
|
AVR: |
| 346 |
|
o) Everything. |
| 347 |
|
|
| 348 |
ARM: |
ARM: |
| 349 |
o) try to get netbsd/evbarm 3.x running (iq80321) |
o) See netwinder_reset() in NetBSD; the current "an internal error |
| 350 |
|
occured" message after reboot/halt is too ugly. |
| 351 |
|
o) ARM "wait"-like instruction? |
| 352 |
|
o) try to get netbsd/evbarm 3.x or 4.x running (iq80321) |
| 353 |
o) make the xscale counter registers (ccnt) work |
o) make the xscale counter registers (ccnt) work |
| 354 |
o) make the ata controller usable for FreeBSD! |
o) make the ata controller usable for FreeBSD! |
| 355 |
o) zaurus for openbsd... |
o) Zaurus emulation: |
| 356 |
o) debian/cats crashes because of unimplemented coproc stuff. |
x) OpenBSD/zaurus |
| 357 |
|
x) NetBSD/zaurus? See the following URL: |
| 358 |
|
http://mail-index.netbsd.org/port-arm/2006/11/19/0000.html |
| 359 |
|
o) Debian/cats crashes because of unimplemented coproc stuff. |
| 360 |
fix this? |
fix this? |
| 361 |
|
|
| 362 |
|
Test machines: |
| 363 |
|
o) dev_fb block fill and copy |
| 364 |
|
o) dev_fb draw characters (from the built-in font)? |
| 365 |
|
o) dev_fb input device? mouse pointer coordinates and buttons |
| 366 |
|
(allow changes in these to cause interrupts as well?) |
| 367 |
|
o) Redefine the halt() function so that it stops "sometimes |
| 368 |
|
soon", i.e. usage in demo code should be: |
| 369 |
|
for (;;) { |
| 370 |
|
halt(); |
| 371 |
|
} |
| 372 |
|
|
| 373 |
|
Better CD Image file support: |
| 374 |
|
x) Support CD formats that contain more than 1 track, e.g. |
| 375 |
|
CDI files (?). These can then contain a mixture of e.g. sound |
| 376 |
|
and data tracks, and booting from an ISO filesystem path |
| 377 |
|
would boot from [by default] the first data track. |
| 378 |
|
(This would make sense for e.g. Dreamcast CD images, or |
| 379 |
|
possibly other live-CD formats.) |
| 380 |
|
|
| 381 |
|
Networking: |
| 382 |
|
x) Fix performance problems caused by only allowing a |
| 383 |
|
single TCP packet to be unacked. |
| 384 |
|
x) Don't hardcode offsets into packets! |
| 385 |
|
x) Test with lower than 100 max tcp/udp connections, |
| 386 |
|
to make sure that reuse works! |
| 387 |
|
x) Make OpenBSD work better as a guest OS! |
| 388 |
|
x) DHCP? Debian doesn't actually send DHCP packets, even |
| 389 |
|
though it claims to? So it is hard to test. |
| 390 |
|
x) Multiple networks per emulation, and let different |
| 391 |
|
NICs in machines connect to different networks. |
| 392 |
|
x) Support VDE (vde.sf.net)? Easiest/cleanest (before a |
| 393 |
|
redesign of the network framework has been done) is |
| 394 |
|
probably to connect it using the current (udp) solution. |
| 395 |
|
x) Allow SLIP connections, possibly PPP, in addition to |
| 396 |
|
ethernet? |
| 397 |
|
|
| 398 |
Cache simulation: |
Cache simulation: |
| 399 |
|
o) Command line flags for: |
| 400 |
|
o) CPU endianness? |
| 401 |
|
o) Cache sizes? (multiple levels) |
| 402 |
o) Separate from the CPU concept, so that multi-core CPUs sharing |
o) Separate from the CPU concept, so that multi-core CPUs sharing |
| 403 |
e.g. a L2 cache can be simulated (?) |
e.g. a L2 cache can be simulated (?) |
| 404 |
o) Instruction cache emulation is easiest (if separate from the |
o) Instruction cache emulation is easiest (if separate from the |
| 411 |
is another option (easier to implement, but very very slow). |
is another option (easier to implement, but very very slow). |
| 412 |
|
|
| 413 |
Documentation: |
Documentation: |
| 414 |
o) machines, cpus, devices. |
x) Note about sandboxing/security: |
| 415 |
o) Automagic documentation generation: |
Not all emulated instructions fail in the way they would |
| 416 |
|
do on real hardware (e.g. a userspace program writing to |
| 417 |
|
a system register might work in GXemul, but it would |
| 418 |
|
fail on real hardware). Sandbox = contain from the |
| 419 |
|
host OS. But the emulated programs will run "less |
| 420 |
|
securely". |
| 421 |
|
x) Try NetBSD/arc 4.x! (It seems to work with disk images!) |
| 422 |
|
x) NetBSD/pmax 4 install instructions: xterm instead of vt100! |
| 423 |
|
x) BETTER DEVICE EXAMPLES! |
| 424 |
|
o) Move away from technical.html to somewhere new. |
| 425 |
|
o) DEVICE_TICK |
| 426 |
|
o) Implement example devices using interrupts, dyntrans |
| 427 |
|
memory access, etc.? |
| 428 |
|
x) Document the dyntrans core? |
| 429 |
|
x) Rewrite the section about experimental devices, after the |
| 430 |
|
framebuffer acceleration has been implemented, and demos |
| 431 |
|
written. (Symbolic names instead of numbers; example |
| 432 |
|
use cases, etc. Mention demo files that use the various |
| 433 |
|
features?) |
| 434 |
|
x) "a very simple linear framebuffer device (for graphics output)" |
| 435 |
|
under "which machines does gxemul emulate" ==> better |
| 436 |
|
description? |
| 437 |
|
x) Better description on how to set up a cross compiler? |
| 438 |
|
Example for MIPS64. |
| 439 |
|
o) Automagic documentation generation? |
| 440 |
|
x) machines, cpus, devices. |
| 441 |
x) REMEMBER that several machines/devices can be in |
x) REMEMBER that several machines/devices can be in |
| 442 |
the same source file! |
the same source file! |
| 443 |
o) Try to rewrite the install instructions for those machines |
o) Try to rewrite the install instructions for those machines |
| 444 |
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 |
| 445 |
ffs partition using up all of the disk image.) |
to use a raw ffs partition, using up all of the disk image.) |
| 446 |
|
|
| 447 |
More generic out_of_memory error reporting, and check everywhere! |
More generic out_of_memory error reporting, and check everywhere! |
| 448 |
Causes: OpenBSD has low default limits for normal users. |
Causes: OpenBSD has low default limits for normal users. |
| 452 |
Unix systems usually allow processes to allocate virtual |
Unix systems usually allow processes to allocate virtual |
| 453 |
memory beyond the amount of RAM in the machine.) |
memory beyond the amount of RAM in the machine.) |
| 454 |
|
|
|
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? |
|
|
|
|
| 455 |
The Device subsystem: |
The Device subsystem: |
| 456 |
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 |
| 457 |
minimum size, etc, or up to a max size) |
minimum size, etc, or up to a max size); if there is a collision, |
| 458 |
|
return false. It is up to the caller to handle this situation! |
| 459 |
|
x) NOTE: Translations must be invalidated, both for |
| 460 |
|
registering new devices, and for moving existing ones. |
| 461 |
|
cpu->invalidate translation caches, for all CPUs that |
| 462 |
|
are connected to a specific memory. |
| 463 |
x) keep track of interrupts and busses? actually, allowing any device |
x) keep track of interrupts and busses? actually, allowing any device |
| 464 |
to be a bus might be a nice idea. |
to be a bus might be a nice idea. |
| 465 |
x) turn interrupt controllers into devices? :-) |
x) turn interrupt controllers into devices? :-) |
| 466 |
x) refactor various clocks/nvram/cmos into one device? |
x) refactor various clocks/nvram/cmos into one device? |
| 467 |
|
|
|
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.) |
|
|
|
|
| 468 |
PCI: |
PCI: |
| 469 |
x) last write was ffffffff ==> fix this, it should be used |
x) last write was ffffffff ==> fix this, it should be used |
| 470 |
together with a mask to get the correct bits. also, not ALL |
together with a mask to get the correct bits. also, not ALL |
| 471 |
bits are size bits! (lowest 4 vs lowest 2?) |
bits are size bits! (lowest 4 vs lowest 2?) |
| 472 |
x) add support for address fixups |
x) add support for address fixups |
| 473 |
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 |
|
| 474 |
|
|
| 475 |
Busses: |
Clocks and timers: |
| 476 |
o) Redesign the entire "mainbus" concept! |
x) DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c! |
| 477 |
o) Busses should be placed in a hierarchical tree! |
x) Test the 8253? Right now it doesn't seem to be used? |
| 478 |
o) Easily configurable interrupt routing in SMP systems. |
x) NetWinder timeofday is incorrect! |
| 479 |
o) Specific clock/bus speeds, cpu speeds etc. |
x) Cobalt TOD is incorrect! |
| 480 |
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? |
|
| 481 |
|
|
| 482 |
Config file parser: |
Config file parser: |
| 483 |
o) Rewrite it from scratch! |
o) Rewrite it from scratch! |
| 484 |
o) Usage of any expression available through the debugger |
o) Usage of any expression available through the debugger |
| 485 |
|
o) Allow interrupt controllers to be added! and interrupts |
| 486 |
|
to be used in more ways than before |
| 487 |
o) Support for running debugger commands (like the -c |
o) Support for running debugger commands (like the -c |
| 488 |
command line option) |
command line option) |
| 489 |
|
|
| 490 |
Floating point layer: |
Floating point layer: |
| 491 |
o) make it common enough to be used by _all_ emulation modes |
o) make it common enough to be used by _all_ emulation modes |
| 492 |
o) implement more stuff |
o) implement correct error/exception handling and rounding modes |
| 493 |
|
o) implement more helper functions (i.e. add, sub, mul...) |
| 494 |
o) non-IEEE modes (i.e. x86)? |
o) non-IEEE modes (i.e. x86)? |
| 495 |
|
|
| 496 |
Userland emulation: |
Userland emulation: |
| 499 |
|
|
| 500 |
Sound: |
Sound: |
| 501 |
x) generic sound framework |
x) generic sound framework |
| 502 |
x) add one or more sound cards as devices |
x) add one or more sound cards as devices; add a testmachine |
| 503 |
|
sound card first? |
| 504 |
|
x) Dreamcast sound? Generic PCI sound cards? |
| 505 |
|
|
| 506 |
ASC SCSI controller: |
ASC SCSI controller: |
| 507 |
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 |
| 508 |
cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem |
cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem |
| 509 |
in NetBSD itself, http://mail-index.netbsd.org/source-changes/ |
in NetBSD itself, http://mail-index.netbsd.org/source-changes/ |
| 510 |
2005/11/06/0024.html suggests that.) |
2005/11/06/0024.html suggests that.) |
| 511 |
|
NetBSD 4.x seems to work? :) |
| 512 |
|
|
| 513 |
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) |
|
| 514 |
o) src/memory*.c: Implement correct cache emulation for |
o) src/memory*.c: Implement correct cache emulation for |
| 515 |
all CPU types. (currently only R2000/R3000 is implemented) |
all CPU types. (currently only R2000/R3000 is implemented) |
| 516 |
(per CPU, multiple levels should be possible, |
(per CPU, multiple levels should be possible, associativity etc!) |
|
associativity etc!) |
|
| 517 |
o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
| 518 |
o) Move the -S (fill mem with random) functionality into the |
o) Move the -S (fill mem with random) functionality into the |
| 519 |
memory.c subsystem, not machine.c or wherever it is now |
memory.c subsystem, not machine.c or wherever it is now |
| 527 |
possible. |
possible. |
| 528 |
|
|
| 529 |
File/disk/symbol handling: |
File/disk/symbol handling: |
| 530 |
o) Better handling of tape files |
o) Make sure that disks can be added/removed during runtime! |
| 531 |
|
(Perhaps this needs a reasonably large re-write.) |
| 532 |
|
o) Remove some of the complexity in file format guessing, for |
| 533 |
|
Ultrix kernels that are actually disk images? |
| 534 |
|
o) Better handling of tape files |
| 535 |
o) Read function argument count and types from binaries? (ELF?) |
o) Read function argument count and types from binaries? (ELF?) |
| 536 |
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. |
| 537 |
Microsoft's C++, so multiple schemes must be possible. See |
Microsoft's C++, so multiple schemes must be possible. See |
| 540 |
Userland ABI emulation: |
Userland ABI emulation: |
| 541 |
o) see src/useremul.c |
o) see src/useremul.c |
| 542 |
|
|
|
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.)) |
|
|
|
|
| 543 |
Better framebuffer and X-windows functionality: |
Better framebuffer and X-windows functionality: |
| 544 |
|
o) Generalize the update_x1y1x2y2 stuff to an extend-region() |
| 545 |
|
function... |
| 546 |
o) -Yx sometimes causes crashes. |
o) -Yx sometimes causes crashes. |
| 547 |
o) Simple device access to framebuffer_blockcopyfill() etc, |
o) Simple device access to framebuffer_blockcopyfill() etc, |
| 548 |
and text output (using the built-in fonts), for dev_fb. |
and text output (using the built-in fonts), for dev_fb. |
| 553 |
o) Non-resizable windows? Or choose scaledown depending |
o) Non-resizable windows? Or choose scaledown depending |
| 554 |
on size (and center the image, with a black border). |
on size (and center the image, with a black border). |
| 555 |
o) Different scaledown on different windows? |
o) Different scaledown on different windows? |
| 556 |
|
o) Non-integral scale-up? (E.g. 640x480 -> 1024x768) |
| 557 |
o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
| 558 |
o) Bug reported by Elijah Rutschman on MacOS with weird |
o) Bug reported by Elijah Rutschman on MacOS with weird |
| 559 |
keys (F5 = cursor down?). |
keys (F5 = cursor down?). |
| 567 |
o) Generalize the framebuffer stuff by moving _ALL_ X11 |
o) Generalize the framebuffer stuff by moving _ALL_ X11 |
| 568 |
specific code to src/x11.c! |
specific code to src/x11.c! |
| 569 |
|
|
|
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 |
|
|
|
|
Parent Directory
| 
Revision Log
| 
Patch