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$Id: TODO,v 1.209 2006/02/18 21:03:09 debug Exp $ |
$Id: TODO,v 1.343 2006/08/14 18:46:30 debug Exp $ |
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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. |
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Algor: PCI and ISA and LOCAL interrupts! --> wdc could start working |
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Add interrupt controller in dev_algor.c. |
Implementation: |
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x) ARM "wait"-like instruction. |
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x) CLOCK FRAMEWORK! |
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x) Mouse support for NetBSD/pmax 4.x! |
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x) See netwinder_reset() in NetBSD; the current "an internal error |
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occured" message after reboot/halt is too ugly. |
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x) 64-bit ranges in src/cpus/memory_mips_v2p.c |
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x) Revert the dyntrans page template experiment? Hm. |
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x) Refactor the cpu type detection/initialization/listing. |
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Macro, which can be used as long as the cpu definitions |
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contain a 'name'? |
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x) Testmachine includes: |
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+ dev_fb block fill and copy |
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+ dev_fb draw characters (from the built-in font)? |
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+ dev_fb input device? mouse pointer coordinates and buttons |
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(allow changes in these to cause interrupts as well?) |
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+ Redefine the halt() function so that it stops "sometimes |
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soon", i.e. usage in demo code should be: |
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for (;;) { |
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halt(); |
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} |
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x) Continue on SPARC emulation |
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+ Enable it in the configure script as soon as it can |
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run all the demo programs. |
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x) Continue on Alpha emulation (virtual memory, etc). Cleanup. |
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x) Nicer MIPS status bits in register dumps. |
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x) Alignment exceptions (MIPS, PPC, ARM?, ...) |
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x) Rewrite the networking stack; make OpenBSD work better as a guest |
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OS, fix the performance problems, make Linux work with DHCP, etc. |
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Support VDE (vde.sf.net)? Allow SLIP connections, possibly PPP, |
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in addition to ethernet? |
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x) Implement more ethernet NICs. |
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x) IOP (I2O) device? |
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Documentation: |
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x) "Install netbsd/pmax first" => only use the install kernel? |
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x) Rewrite the section about experimental devices, after the |
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framebuffer acceleration has been implemented, and demos |
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written. (Symbolic names instead of numbers; example |
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use cases, etc. Mention demo files that use the various |
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features?) |
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x) "a very simple linear framebuffer device (for graphics output)" |
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under "which machines does gxemul emulate" ==> better |
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description? |
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x) Better description on how to set up a cross compiler? |
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Example for MIPS64. |
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Long-term design: |
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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! |
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o) Actually use the settings object, better debugger stuff, etc! |
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o) Debugger command for enabling/disabling instruction statistics |
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during runtime. machine.statistics = on|off |
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x) MAINBUS REDESIGN! |
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x) PCI redesign... I need to read up on how PCI actually works :) |
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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) 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) Reimplement the config file parser from scratch. |
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------------------------------------------------------------------------------- |
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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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SMP: |
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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 |
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MIPS: |
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+) Some more work on opcodes. |
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x) The "wait" instruction. How to implement this functionality? |
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(SMP, non-MIPS, interrupt correctness, host idling, ...) |
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x) MIPS64 revision 2. |
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o) Find out which actual CPUs implement the rev2 ISA! |
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x) _MAYBE_ TX79 and R5900 actually differ in their |
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opcodes? Check this carefully! |
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o) Dyntrans: Count register updates are probably not 100% correct yet. |
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o) Refactor code for performance and readability/maintainability. |
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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) (Re)implement 128-bit loads/stores 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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x) memory space, exceptions, ... |
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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) |
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Dyntrans: |
Dyntrans: |
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TOP Priority: |
x) Redesign/rethink the delay slot mechanism used for e.g. MIPS, |
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x) 64-bit stuff: good generic virtual memory translation, and |
so that it caches a translation (that is, an instruction |
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other structures. not all 64 bits need to be used |
word and the instr_call it was translated to the last |
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(e.g. Alpha) |
time), so that it doesn't need to do slow |
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x) Delay slots! |
to_be_translated for each end of page? |
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x) Old MIPS -> dyntrans! |
x) Program Counter statistics: |
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Other stuff: |
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) Common fatal_abort() function, which drops into the debugger |
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without continuing. |
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x) INVALIDATION should cause translations in _all_ cpus to be |
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 |
invalidated, e.g. on a write to a write-protected page |
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(containing code) |
(containing code) |
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x) Think about sharing code between CPUs of the same |
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arch/bitlength/endianness (the translation caches). |
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(Eg. a little-endian R4000 and a little-endian R5000 could |
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share code, but not an R3000 and an R4000.) |
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x) better (meaningful) instr call statistics |
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x) Call/return hints? |
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x) 16-bit encodings? (MIPS16, ARM Thumb, SH3, ...) |
x) 16-bit encodings? (MIPS16, ARM Thumb, SH3, ...) |
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x) PPC optimizations; instr combs |
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x) Alpha |
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x) SPARC |
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x) PPC (64-bit stuff) |
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x) Lots of other stuff: see src/cpus/README_DYNTRANS |
x) Lots of other stuff: see src/cpus/README_DYNTRANS |
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x) true recompilation backend? think carefully about this, |
x) true recompilation backend? think carefully about this, |
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experiment in a separate project (not in GXemul) |
experiment in a separate project (not in GXemul) |
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o) First test would be to just implement a simple |
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instruction such as MIPS' addiu or lui, on AMD64 |
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hosts... |
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x) Idle loop detection? (Depends on target.) Could be turned |
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into usleep(1) or similar on the host... except when doing |
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e.g. SMP emulation. Then it becomes trickier. |
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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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Alpha: |
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o) Virtual memory (tlbs etc) |
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o) Get {NetBSD,OpenBSD,Linux}/alpha booting. :) |
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SPARC: |
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o) Load/stores to alternate address spaces! |
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o) Save/restore register windows etc! |
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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) Disassemly of some more instructions? |
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o) Are sll etc 32-bit sign-extending or zero-extending? |
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o) Finish the GDB register stuff. |
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o) SPARC v8, v7 etc? |
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Debugger: |
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o) How does SMP debugging work? Does it simply use "threads"? |
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What if the guest OS (running on an emulated SMP machine) |
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has a usertask running, with userland threads? |
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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 |
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machines?) |
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o) Generalize the expression evaluator. (debugger_expr.c?) |
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settable variables ("show nr of instructions on average") |
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emul[x] defaults to current emul |
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machine[x] defaults to current machine |
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cpu[x] defaults to currently focused cpu |
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registers cpu arch dependent (#-prefix) |
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symbols @-prefix |
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numeric constants decimal, hex, and octal ($-prefix) |
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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 |
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settings.show_trace_tree = yes |
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Settings: |
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o) Remove a setting. |
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o) Read/write a setting given a name. (Read as |
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string and/or int64_t simultaneously?) |
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o) Warnings when exiting the emulator, if the |
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settings have not been removed exactly in |
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the same way as they were added? This would |
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improve code cleanliness in the long term. |
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(I.e. require a corresponding _destroy() |
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function for all _new functions... machine_ |
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cpu_ etc.) |
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Help command should have subsections! One for "expressions", |
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mirrored in the documentation, but the internal help should |
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be the one that should be considered correct. |
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o) see src/debugger.c for more |
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POWER/PowerPC: |
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x) PPC optimizations; instr combs |
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x) 64-bit stuff: either Linux on G5, or perhaps some hobbyist |
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version of AIX? (if there exists such a thing) |
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x) find and fix the bug which causes NetBSD/macppc to fail after |
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an install! |
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x) macppc: adb controller; keyboard (for framebuffer mode) |
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x) make OpenBSD/macppc work (PCI controller stuff) |
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Algor: |
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PCI interrupts... needed or stuff like the tlp NIC? |
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ARM: |
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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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o) make the ata controller usable for FreeBSD! |
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o) zaurus for openbsd... |
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o) debian/cats crashes because of unimplemented coproc stuff. |
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fix this? |
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Cache simulation: |
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o) Command line flags for: |
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o) CPU endianness? |
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o) Cache sizes? (multiple levels) |
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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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o) Instruction cache emulation is easiest (if separate from the |
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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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slot can actually be executed as 2 instructions. |
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o) Data cache emulation = harder; each arch's load/store routines |
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must include support? running one instruction at a time and |
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having a cpu-dependant lookup function for each instruction |
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is another option (easier to implement, but very very slow). |
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Documentation: |
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o) machines, cpus, devices. |
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o) Automagic documentation generation: |
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x) REMEMBER that several machines/devices can be in |
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the same source file! |
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o) Try to rewrite the install instructions for those machines |
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that use 3MAX into using CATS? (To remove the need to a raw |
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ffs partition using up all of the disk image.) |
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More generic out_of_memory error reporting, and check everywhere! |
More generic out_of_memory error reporting, and check everywhere! |
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Causes: OpenBSD has low default limits for normal users. |
Causes: OpenBSD has low default limits for normal users. |
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extended soon to support stuff like "2*x + symbol + y" etc. cool |
extended soon to support stuff like "2*x + symbol + y" etc. cool |
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stuff) |
stuff) |
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Sprite (guest OS for DECstation emulation) |
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x) Timing problems during bootup? |
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The Device subsystem: |
The Device subsystem: |
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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 |
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minimum size, etc, or up to a max size) |
minimum size, etc, or up to a max size) |
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x) keep track of interrupts and busses? actually, allowing any device |
x) keep track of interrupts and busses? actually, allowing any device |
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to be a bus might be a nice idea |
to be a bus might be a nice idea. |
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x) turn interrupt controllers into devices? :-) |
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x) refactor various clocks/nvram/cmos into one device? |
x) refactor various clocks/nvram/cmos into one device? |
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ARM: |
Clocks: |
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o) add ID for "i80321 600MHz rev 2 (XScale core)" |
x) General framework for automagic clock adjustment for _all_ |
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o) make the ata controller usable for FreeBSD! |
kinds of clocks and timers. (Which should be possible to turn |
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x) zaurus for openbsd... |
off, of course, like the way DECstation emulation works now.) |
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PCI: |
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 |
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bits are size bits! (lowest 4 vs lowest 2?) |
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x) add support for address fixups |
x) add support for address fixups |
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x) generalize the interrupt routing stuff (lines etc). this should |
x) generalize the interrupt routing stuff (lines etc). this should |
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be per machine? or per bus, that's better |
be per machine? or per bus, that's better |
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x) add a "pcn" NIC (AMD PCnet32 Lance 79c970 (PCI 1022:2000)), |
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MacPPC: |
could be useful for several machine modes (Malta, Algor, evbarm, |
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x) dev_zs / interrupts? |
hp700?, macppc, etc.) |
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x) adb controller; keyboard |
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x) make OpenBSD/macppc work (PCI controller stuff) |
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Network layer: |
Network layer: |
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o) DHCP (for Debian and BSD installers :-) |
o) DHCP (for Debian and BSD installers :-) |
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o) dev->bus: TurboChannel, PCMCIA, ADB? |
o) dev->bus: TurboChannel, PCMCIA, ADB? |
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Config file parser: |
Config file parser: |
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o) Refresh/rewrite it :) |
o) Rewrite it from scratch! |
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o) Usage of any expression available through the debugger |
o) Usage of any expression available through the debugger |
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o) Expressions such as "add device" would be nice to be able |
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to do on the command line manually. |
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o) Allow machine() entries even if there is no emul() entry (but |
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then don't allow any emul() entries at all). |
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o) Support for running debugger commands (like the -c |
o) Support for running debugger commands (like the -c |
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command line option) |
command line option) |
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Floating point layer: |
Floating point layer: |
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o) make it common enough to be used by _all_ emulation modes |
o) make it common enough to be used by _all_ emulation modes |
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o) implement more stuff |
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o) non-IEEE modes (i.e. x86)? |
o) non-IEEE modes (i.e. x86)? |
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Userland emulation: |
Userland emulation: |
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x) generic sound framework |
x) generic sound framework |
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x) add one or more sound cards as devices |
x) add one or more sound cards as devices |
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ASC SCSI controller: |
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x) NetBSD/arc 2.0 uses the ASC controller in a way which GXemul |
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cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem |
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in NetBSD itself, http://mail-index.netbsd.org/source-changes/ |
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2005/11/06/0024.html suggests that.) |
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Caches / memory hierarchies: (this is mostly MIPS-specific) |
Caches / memory hierarchies: (this is mostly MIPS-specific) |
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o) MIPS coproc.c: bits in config registers should reflect |
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correct cache sizes for _all_ CPU types. (currently only |
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implemented for R4000, R1x000, and a few others) |
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o) src/memory*.c: Implement correct cache emulation for |
o) src/memory*.c: Implement correct cache emulation for |
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all CPU types. (currently only R2000/R3000 is implemented) |
all CPU types. (currently only R2000/R3000 is implemented) |
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(per CPU, multiple levels should be possible, |
(per CPU, multiple levels should be possible, associativity etc!) |
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associativity etc!) |
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o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
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o) Move the -S (fill mem with random) functionality into the |
o) Move the -S (fill mem with random) functionality into the |
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memory.c subsystem, not machine.c or wherever it is now |
memory.c subsystem, not machine.c or wherever it is now |
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memory latencies should be emulated as correctly as |
memory latencies should be emulated as correctly as |
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possible. |
possible. |
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MIPS CPU emulation: (note: this is for the OLD mips stuff) |
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o) i386 bintrans backend: movn etc, slt[u] for |
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64-bit mode, 64-bit shifts etc |
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o) Instructions: |
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o) All ISAs: |
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o) Floating point exception handling, and |
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add more instructions. |
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o) Finish the MIPS16 translator, and test it! |
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o) MIPS ISA I, II, III, IV |
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o) MIPS V (SIMD vector stuff?) |
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o) MDMX (MIPS Digital Media Extension) |
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o) MIPS 3D |
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o) MIPS MT (Multi-thread stuff) (What's this?) |
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o) Warn about mis-used bit fields (ie bits that |
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should be all zeroes, warn about if they are not)! |
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Both for coprocessor registers and for instruction |
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opcodes. |
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o) the special2 stuff is a mess right now |
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o) warn and/or cause exceptions for unimplemented |
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instructions (depending on CPU type) |
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o) R2000/R3000: |
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x) R3000 "tri-byte stores". (What's this?) |
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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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x) memory space, exceptions, ... |
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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) |
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o) Implement load delays? Warnings on interlocks. |
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o) Implement all coprocessor 0 bits / functions. |
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x) coproc 0 selectors! (R4000 ?) |
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o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird |
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TLB/cache? 128-bit GPRs, new instructions), |
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4K (note: NOT R4000), 5K (note: NOT R5000), |
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R6000 (ISA II), R8000 |
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o) Multi-cpu stuff: |
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+) Interrupt routing (ie devices vs mainbus, or |
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connect each device to a fixed cpu) |
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+) SGI's NUMA architecture. Study |
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x) Linux sources |
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x) SGI's specs on NUMA address space |
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+) Ultrix? NetBSD doesn't do SMP on MIPS yet :-( |
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+) Own experiments with ycx2. |
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348 |
File/disk/symbol handling: |
File/disk/symbol handling: |
349 |
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o) Remove some of the complexity in file format guessing, for |
350 |
|
Ultrix kernels that are actually disk images? |
351 |
o) Better handling of tape files |
o) Better handling of tape files |
352 |
o) Read function argument count and types from binaries? (ELF?) |
o) Read function argument count and types from binaries? (ELF?) |
353 |
o) Demangle C++ names. |
o) Better demangling of C++ names. Note: GNU's C++ differs from e.g. |
354 |
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Microsoft's C++, so multiple schemes must be possible. See |
355 |
Debugger: |
URL at top of src/symbol_demangle.c for more info. |
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o) see src/debugger.c for more |
|
356 |
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357 |
Userland ABI emulation: |
Userland ABI emulation: |
358 |
o) see src/useremul.c |
o) see src/useremul.c |
379 |
on size (and center the image, with a black border). |
on size (and center the image, with a black border). |
380 |
o) Different scaledown on different windows? |
o) Different scaledown on different windows? |
381 |
o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
382 |
|
o) Bug reported by Elijah Rutschman on MacOS with weird |
383 |
|
keys (F5 = cursor down?). |
384 |
o) Keyboard and mouse events: |
o) Keyboard and mouse events: |
385 |
x) Do this for more machines than just DECstation |
x) Do this for more machines than just DECstation |
386 |
x) more X11 cursor keycodes |
x) more X11 cursor keycodes |