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$Id: TODO,v 1.166 2005/08/16 05:44:33 debug Exp $ |
$Id: TODO,v 1.298 2006/06/25 11:08:04 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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High priority stuff: |
-------------- |
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x) FIX THE NON-R3000 TRANSLATION CACHE INVALIDATION BOTTLENECKS! |
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MIPS bintrans: |
x) Find a way to get rid of the cpu_create_or_reset_tc in the |
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x) call/return address cache? |
R2000/R3000 cache isolation code. (NetBSD works without it, |
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|
but not Ultrix and Linux yet.) |
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dyntrans: |
x) Formalize the statistics gathering stuff for dyntrans... |
| 12 |
x) memory write protection for ARM, but NOT for Alpha (because |
x) ... and use it to optimize MIPS dyntrans stuff. |
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it has the IMB instruction... hm) |
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) call/return address cache |
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) instr_call sequence analysis support? (Useful for |
x) Dyntrans with cache emulation... lots of work here as well. |
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handtuning combinations.) |
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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x) opcode statistics support? |
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TODO: is instr_call statistics enough? |
-------------- |
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x) support for archs that allow transparent unaligned load/stores |
SMP: |
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o) dev_mp doesn't work well with dyntrans yet |
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x) SMP: detect when an instruction such as ll/sc or cas is used, |
o) In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans |
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and "synchronize" approximately the number of executed instructions |
|
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(or cycles) across all CPUs. |
MIPS: |
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o) Fix invalidate_asid so it works well for non-R3000 too! |
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x) support for variable-length instructions (x86, m68k, ...) |
x) [Re]add an interrupt-asserted bit for MIPS, to speed up |
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Perhaps: don't increase the next_ic between every |
interrupt handling slightly? |
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instruction, but let each instruction's handler do |
+) Print a warning on the first reserved instruction. |
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that for itself. |
+) Some more work on opcodes. |
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Problem: what about instructions crossing a (virtual) |
x) MIPS64 revision 2. |
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page boundary? They cannot be translated once |
x) _MAYBE_ TX79 and R5900 actually differ in their |
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and for all :( and must be interpreted slowly! |
opcodes? Check this carefully! |
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|
o) Dyntrans: Count register updates are probably not 100% correct yet. |
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x) support for THUMB or MIPS16 (arm, mips) |
o) Dyntrans: SMP correctness |
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|
o) Refactor code for performance and readability/maintainability. |
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x) support for Delay slots! (mips, sparc, hppa) |
o) Instruction combinations? Possible candidates (but profile first!): |
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o) multiple loads/stores in a row |
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x) Alpha: hahaha, zapnot and inserts/extracts don't |
o) strlen, memset loops etc |
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compile into very nice code :-| fix this |
o) compare + branch |
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o) DROTR32 and similar MIPS64 rev 2 instructions, which have |
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x) 64-bit virtual memory translation tables (PPC, etc) |
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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x) x86: convert to dyntrans. LOTS of stuff to consider. |
_NOT_ the same as for R5900! |
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o) R4000 and others: |
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x) watchhi/watchlo exceptions, and other exception |
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=============================================================================== |
handling details |
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o) R10000 and others: (R12000, R14000 ?) |
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Lower priority, but still important: |
x) memory space, exceptions, ... |
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x) use cop0 framemask for tlb lookups |
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Redesign the entire "mainbus" concept: |
(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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o) Easily configurable interrupt routing in SMP systems. |
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o) Specific clock/bus speeds, cpu speeds etc. |
Dyntrans: |
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o) Synchronization over network? |
x) Move the mips_init_64bit_dummy_tables() etc calls into |
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src/cpu.c, for all 64-bit cpus? |
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Caches / memory hierarchies: (this is mostly MIPS-specific) |
x) 64-bit "phystranslation" lookup as in 32-bit mode? Would probably |
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o) MIPS coproc.c: bits in config registers should reflect |
help performance a bit. |
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correct cache sizes for _all_ CPU types. (currently only |
x) Common fatal_abort() function, which drops into the debugger |
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implemented for R4000, R1x000, and a few others) |
without continuing. |
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o) src/memory*.c: Implement correct cache emulation for |
x) INVALIDATION should cause translations in _all_ cpus to be |
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all CPU types. (currently only R2000/R3000 is implemented) |
invalidated, e.g. on a write to a write-protected page |
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(per CPU, multiple levels should be possible, |
(containing code) |
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associativity etc!) |
x) better (formally defined) instr call statistics (-s command |
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o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
line option?), multiple different types? (virtual pc, physical pc) |
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o) Move the -S (fill mem with random) functionality into the |
x) Call/return hints? |
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memory.c subsystem, not machine.c or wherever it is now |
x) 16-bit encodings? (MIPS16, ARM Thumb, SH3, ...) |
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o) ECC stuff, simulation of memory errors? (Machine dependant) |
x) H8? |
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o) More than 4GB of emulated RAM, when run on a 32-bit host? |
x) Lots of other stuff: see src/cpus/README_DYNTRANS |
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(using manual swap-out of blocks to disk, ugly) |
x) true recompilation backend? think carefully about this, |
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o) A global command line option should be used to turn |
experiment in a separate project (not in GXemul) |
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cache emulation on or off. When off, caches should be |
x) Remove the dyntrans_alignment_check functionality; although |
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faked like they are right now. When on, caches and |
it gives slightly higher peformance sometimes, it increases |
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memory latencies should be emulated as correctly as |
the complexity of the code too much! |
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possible. |
|
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Alpha: |
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Network layer: |
o) Virtual memory (tlbs etc) |
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o) Multiple networks per emulation, and let different |
o) Get {NetBSD,OpenBSD,Linux}/alpha booting. :) |
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NICs in machines connect to different networks. |
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o) many other issues: see src/net.c |
SPARC: |
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o) Add all registers (floating point, control regs etc) |
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MIPS CPU emulation: |
o) Save/restore register windows etc! |
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o) i386 bintrans backend: movn etc, slt[u] for |
o) Disassemly of some more instructions. |
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64-bit mode, 64-bit shifts etc |
o) Are sll etc 32-bit sign-extending or zero-extending? |
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o) Instructions: |
o) Finish the cmp (subcc) flag computation code. |
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o) All ISAs: |
o) Finish the GDB register stuff. |
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o) Floating point exception handling, and |
|
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add more instructions. |
Debugger: |
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o) Finish the MIPS16 translator, and test it! |
o) How does SMP debugging work? Does it simply use "threads"? |
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o) MIPS ISA I, II, III, IV |
What if the guest OS (running on an emulated SMP machine) |
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o) MIPS V (SIMD vector stuff?) |
has a usertask running, with userland threads? |
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o) MDMX (MIPS Digital Media Extension) |
o) Try to make the debugger more modular and, if possible, reentrant! |
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o) MIPS 3D |
o) Remove the emul command? (But show network info if showing |
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o) MIPS MT (Multi-thread stuff) (What's this?) |
machines?) |
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o) Warn about mis-used bit fields (ie bits that |
o) Generalize the expression evaluator. (debugger_expr.c?) |
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should be all zeroes, warn about if they are not)! |
settable variables ("show nr of instructions on average") |
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Both for coprocessor registers and for instruction |
emul[x] defaults to current emul |
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opcodes. |
machine[x] defaults to current machine |
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o) the special2 stuff is a mess right now |
cpu[x] defaults to currently focused cpu |
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o) warn and/or cause exceptions for unimplemented |
registers cpu arch dependent (#-prefix) |
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instructions (depending on CPU type) |
symbols @-prefix |
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o) R2000/R3000: |
numeric constants decimal, hex, and octal ($-prefix) |
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x) R3000 "tri-byte stores". (What's this?) |
boolean yes,no, true,false |
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o) R4000 and others: |
operators (+ - * / % & | ^ !) |
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x) watchhi/watchlo exceptions, and other exception |
parentheses for grouping subexpressions |
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handling details |
NOTE: the change from % to # for register prefix! |
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o) R10000 and others: (R12000, R14000 ?) |
examples: |
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x) memory space, exceptions, ... |
emul[0].machine[2].cpu[0].pc |
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x) use cop0 framemask for tlb lookups |
machine[test2].cpu[1].ra = main |
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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) |
settings.show_trace_tree = yes |
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o) Implement load delays? Warnings on interlocks. |
|
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o) Implement all coprocessor 0 bits / functions. |
Settings: |
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x) coproc 0 selectors! (R4000 ?) |
o) Remove a setting. |
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o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird |
o) Read/write a setting given a name. (Read as |
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TLB/cache? 128-bit GPRs, new instructions), |
string and/or int64_t simultaneously?) |
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4K (note: NOT R4000), 5K (note: NOT R5000), |
|
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R6000 (ISA II), R8000 |
Help command should have subsections! One for "expressions", |
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o) Multi-cpu stuff: |
mirrored in the documentation, but the internal help should |
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+) Interrupt routing (ie devices vs mainbus, or |
be the one that should be considered correct. |
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connect each device to a fixed cpu) |
o) see src/debugger.c for more |
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+) SGI's NUMA architecture. Study |
|
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x) Linux sources |
POWER/PowerPC: |
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x) SGI's specs on NUMA address space |
x) PPC optimizations; instr combs |
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+) Ultrix? NetBSD doesn't do SMP on MIPS yet :-( |
x) 64-bit stuff |
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+) Own experiments with ycx2. |
x) find and fix the bug which causes NetBSD/macppc to fail after |
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an install! |
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File/disk handling: |
x) macppc: adb controller; keyboard (for framebuffer mode) |
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o) Better handling of tape files |
x) make OpenBSD/macppc work (PCI controller stuff) |
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Debugger: |
Algor: |
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o) Read function argument count and types from binaries? (ELF?) |
PCI and ISA and LOCAL interrupts! --> wdc could start working |
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o) Demangle C++ names. |
Add interrupt controller in dev_algor.c. |
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|
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Userland ABI emulation: |
ARM: |
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o) see src/useremul.c |
o) try to get netbsd/evbarm 3.x running (iq80321) |
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|
o) make the xscale counter registers (ccnt) work |
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Terminal based interactive debugger: |
o) make the ata controller usable for FreeBSD! |
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o) see src/debugger.c |
o) zaurus for openbsd... |
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|
o) debian/cats crashes because of unimplemented coproc stuff. |
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Terminal/console stuff: |
fix this? |
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o) allow emulated serial ports to be connected to the outside |
|
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world in a more generic way, or even to other emulated |
Cache simulation: |
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machines(!) |
o) Separate from the CPU concept, so that multi-core CPUs sharing |
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|
e.g. a L2 cache can be simulated (?) |
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Regression tests. (Needs to be totally rewritten, the old framework |
o) Instruction cache emulation is easiest (if separate from the |
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was removed because it was useless.) |
data cache); similar hack as the S;I; hack in cpu_dyntrans.c. |
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|
NOTE: if the architecture has a delay slot, then an instruction |
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Save state of the whole emulated machine, to be able to load it back |
slot can actually be executed as 2 instructions. |
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in later? (Memory, all device's states, all registers and |
o) Data cache emulation = harder; each arch's load/store routines |
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so on. Like taking a snapshot. (SimOS seems to do this, |
must include support? running one instruction at a time and |
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according to its website.)) |
having a cpu-dependant lookup function for each instruction |
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|
is another option (easier to implement, but very very slow). |
| 154 |
Better X-windows functionality: |
|
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o) CLEAN UP the ugly event code |
Documentation: |
| 156 |
o) Mouse clicks can be "missed" in the current system; this is |
o) machines, cpus, devices. |
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not good. They should be put on a stack of some kind. |
o) Automagic documentation generation: |
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o) More 2D and 3D framebuffer acceleration. |
x) REMEMBER that several machines/devices can be in |
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o) Non-resizable windows? Or choose scaledown depending |
the same source file! |
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on size (and center the image, with a black border). |
o) Try to rewrite the install instructions for those machines |
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o) Different scaledown on different windows? |
that use 3MAX into using CATS? (To remove the need to a raw |
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o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
ffs partition using up all of the disk image.) |
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o) Keyboard and mouse events: |
|
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x) Do this for more machines than just DECstation |
More generic out_of_memory error reporting, and check everywhere! |
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x) more X11 cursor keycodes |
Causes: OpenBSD has low default limits for normal users. |
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x) Keys like CTRL, ALT, SHIFT do not get through |
Host is 32-bit? (32-bit hosts are limited to 4 GB or less |
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by themselves (these are necessary for example |
of userspace memory.) |
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to change the font of an xterm in X in the |
You are actually low on RAM. (As trivial as this might sound, |
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emulator) |
Unix systems usually allow processes to allocate virtual |
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o) Generalize the framebuffer stuff by moving _ALL_ X11 |
memory beyond the amount of RAM in the machine.) |
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specific code to src/x11.c! |
|
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|
Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc. |
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Statistics: (this could be interesting) |
Use the debugger's symbolic name stuff. (which will have to be |
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o) Save to file and show graphics. It should be possible to |
extended soon to support stuff like "2*x + symbol + y" etc. cool |
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run gxemul after a simulation to just show the graphics, |
stuff) |
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or convert to a .ppm or .tga or similar. |
|
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o) memory accesses (to measure cache efficiency and |
Sprite (guest OS for DECstation emulation) |
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page coloring efficiency) |
x) Timing problems during bootup? |
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o) nr of simultaneous ASIDs in use in the TLB, for MIPS |
|
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o) percentage of time spent in different "states", such as |
The Device subsystem: |
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running userland code, kernel code, or idling (for CPUs |
x) allow devices to be moved and/or changed in size (down to a |
| 182 |
that have such an instruction, or whenever the PC is |
minimum size, etc, or up to a max size) |
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inside a specific idle-function (address range)). |
x) keep track of interrupts and busses? actually, allowing any device |
| 184 |
Possible additional state (for example on R3000): caches |
to be a bus might be a nice idea. |
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disabled. |
x) turn interrupt controllers into devices? :-) |
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o) position of read/write on (SCSI) disks |
x) refactor various clocks/nvram/cmos into one device? |
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|
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Clocks: |
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x) General framework for automagic clock adjustment for _all_ |
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kinds of clocks and timers. (Which should be possible to turn |
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off, of course, like the way DECstation emulation works now.) |
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PCI: |
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x) last write was ffffffff ==> fix this, it should be used |
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together with a mask to get the correct bits. also, not ALL |
| 196 |
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bits are size bits! (lowest 4 vs lowest 2?) |
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x) add support for address fixups |
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x) generalize the interrupt routing stuff (lines etc). this should |
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|
be per machine? or per bus, that's better |
| 200 |
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x) add a "pcn" NIC (AMD PCnet32 Lance 79c970 (PCI 1022:2000)), |
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could be useful for several machine modes (Malta, Algor, evbarm, |
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hp700?, macppc, etc.) |
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|
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|
Network layer: |
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o) DHCP (for Debian and BSD installers :-) |
| 206 |
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o) increase performance |
| 207 |
|
o) don't rely on NetBSD-ish usage |
| 208 |
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o) Multiple networks per emulation, and let different |
| 209 |
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NICs in machines connect to different networks. |
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|
o) many other issues: see src/net.c |
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|
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Busses: |
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o) Redesign the entire "mainbus" concept! |
| 214 |
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o) Busses should be placed in a hierarchical tree! |
| 215 |
|
o) Easily configurable interrupt routing in SMP systems. |
| 216 |
|
o) Specific clock/bus speeds, cpu speeds etc. |
| 217 |
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o) Synchronization over network? or at least in dyntrans within |
| 218 |
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one emulated machine |
| 219 |
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o) dev->bus: TurboChannel, PCMCIA, ADB? |
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|
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Config file parser: |
| 222 |
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o) Rewrite it from scratch! |
| 223 |
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o) Usage of any expression available through the debugger |
| 224 |
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o) Support for running debugger commands (like the -c |
| 225 |
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command line option) |
| 226 |
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|
| 227 |
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Floating point layer: |
| 228 |
|
o) make it common enough to be used by _all_ emulation modes |
| 229 |
|
o) implement more stuff |
| 230 |
|
o) non-IEEE modes (i.e. x86)? |
| 231 |
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|
| 232 |
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Userland emulation: |
| 233 |
|
x) Lots of stuff; freebsd and netbsd (and linux?) syscalls. |
| 234 |
|
x) Dynamic linking? Hm. |
| 235 |
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|
| 236 |
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Sound: |
| 237 |
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x) generic sound framework |
| 238 |
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x) add one or more sound cards as devices |
| 239 |
|
|
| 240 |
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ASC SCSI controller: |
| 241 |
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x) NetBSD/arc 2.0 uses the ASC controller in a way which GXemul |
| 242 |
|
cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem |
| 243 |
|
in NetBSD itself, http://mail-index.netbsd.org/source-changes/ |
| 244 |
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2005/11/06/0024.html suggests that.) |
| 245 |
|
|
| 246 |
|
Caches / memory hierarchies: (this is mostly MIPS-specific) |
| 247 |
|
o) MIPS coproc.c: bits in config registers should reflect |
| 248 |
|
correct cache sizes for _all_ CPU types. (currently only |
| 249 |
|
implemented for R4000, R1x000, and a few others) |
| 250 |
|
o) src/memory*.c: Implement correct cache emulation for |
| 251 |
|
all CPU types. (currently only R2000/R3000 is implemented) |
| 252 |
|
(per CPU, multiple levels should be possible, |
| 253 |
|
associativity etc!) |
| 254 |
|
o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
| 255 |
|
o) Move the -S (fill mem with random) functionality into the |
| 256 |
|
memory.c subsystem, not machine.c or wherever it is now |
| 257 |
|
o) ECC stuff, simulation of memory errors? (Machine dependent) |
| 258 |
|
o) More than 4GB of emulated RAM, when run on a 32-bit host? |
| 259 |
|
(using manual swap-out of blocks to disk, ugly) |
| 260 |
|
o) A global command line option should be used to turn |
| 261 |
|
cache emulation on or off. When off, caches should be |
| 262 |
|
faked like they are right now. When on, caches and |
| 263 |
|
memory latencies should be emulated as correctly as |
| 264 |
|
possible. |
| 265 |
|
|
| 266 |
|
File/disk/symbol handling: |
| 267 |
|
o) Better handling of tape files |
| 268 |
|
o) Read function argument count and types from binaries? (ELF?) |
| 269 |
|
o) Better demangling of C++ names. Note: GNU's C++ differs from e.g. |
| 270 |
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Microsoft's C++, so multiple schemes must be possible. See |
| 271 |
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URL at top of src/symbol_demangle.c for more info. |
| 272 |
|
|
| 273 |
|
Userland ABI emulation: |
| 274 |
|
o) see src/useremul.c |
| 275 |
|
|
| 276 |
|
Terminal/console: |
| 277 |
|
o) allow emulated serial ports to be connected to the outside |
| 278 |
|
world in a more generic way, or even to other emulated |
| 279 |
|
machines(?) |
| 280 |
|
|
| 281 |
|
Save state of the whole emulated machine, to be able to load it back |
| 282 |
|
in later? (Memory, all device's states, all registers and |
| 283 |
|
so on. Like taking a snapshot. (SimOS seems to do this, |
| 284 |
|
according to its website.)) |
| 285 |
|
|
| 286 |
|
Better framebuffer and X-windows functionality: |
| 287 |
|
o) -Yx sometimes causes crashes. |
| 288 |
|
o) Simple device access to framebuffer_blockcopyfill() etc, |
| 289 |
|
and text output (using the built-in fonts), for dev_fb. |
| 290 |
|
o) CLEAN UP the ugly event code |
| 291 |
|
o) Mouse clicks can be "missed" in the current system; this is |
| 292 |
|
not good. They should be put on a stack of some kind. |
| 293 |
|
o) More 2D and 3D framebuffer acceleration. |
| 294 |
|
o) Non-resizable windows? Or choose scaledown depending |
| 295 |
|
on size (and center the image, with a black border). |
| 296 |
|
o) Different scaledown on different windows? |
| 297 |
|
o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
| 298 |
|
o) Bug reported by Elijah Rutschman on MacOS with weird |
| 299 |
|
keys (F5 = cursor down?). |
| 300 |
|
o) Keyboard and mouse events: |
| 301 |
|
x) Do this for more machines than just DECstation |
| 302 |
|
x) more X11 cursor keycodes |
| 303 |
|
x) Keys like CTRL, ALT, SHIFT do not get through |
| 304 |
|
by themselves (these are necessary for example |
| 305 |
|
to change the font of an xterm in X in the |
| 306 |
|
emulator) |
| 307 |
|
o) Generalize the framebuffer stuff by moving _ALL_ X11 |
| 308 |
|
specific code to src/x11.c! |
| 309 |
|
|
| 310 |
|
Statistics: (this could be interesting) |
| 311 |
|
o) Save to file and show graphics. It should be possible to |
| 312 |
|
run gxemul after a simulation to just show the graphics, |
| 313 |
|
or convert to a .ppm or .tga or similar. |
| 314 |
|
o) memory accesses (to measure cache efficiency and |
| 315 |
|
page coloring efficiency) |
| 316 |
|
o) nr of simultaneous ASIDs in use in the TLB, for MIPS |
| 317 |
|
o) percentage of time spent in different "states", such as |
| 318 |
|
running userland code, kernel code, or idling (for CPUs |
| 319 |
|
that have such an instruction, or whenever the PC is |
| 320 |
|
inside a specific idle-function (address range)). |
| 321 |
|
Possible additional state (for example on R3000): caches |
| 322 |
|
disabled. |
| 323 |
|
o) position of read/write on (SCSI) disks |
| 324 |
|
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Revision Log
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Patch