/[gxemul]/trunk/TODO
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 40 by dpavlin, Mon Oct 8 16:22:11 2007 UTC revision 44 by dpavlin, Mon Oct 8 16:22:56 2007 UTC
# Line 1  Line 1 
1  $Id: TODO,v 1.489 2007/05/01 04:05:06 debug Exp $  $Id: TODO,v 1.556 2007/09/11 21:46:35 debug Exp $
2    
3  --------------------------------------------  Some things, in no specific order, that I'd like to fix:
4    (Some items in this list are perhaps already fixed.)
5    
6  Testing for the next release (0.4.5.1):  -------------------------------------------------------------------------------
7    
8  TEST DISK OVERLAY IMAGES  A first pass of installation regression testing of NetBSD 4.0 RC1 in GXemul:
 TEST LANDISK/SUPERH EMULATION MODES  
 REGRESSION TESTS FOR ALL OTHER SUPPORTED GUEST OSES  
   
 # NetBSD/pmax 3.1 or 1.6.2      OK  
 # NetBSD/arc 1.6.2              OK  
 # NetBSD/hpcmips 3.1            OK  
 # NetBSD/cobalt 3.1             OK  
 # NetBSD/evbmips 3.1            OK  
 # NetBSD/algor 3.1              OK  
 # NetBSD/sgimips 3.1            OK  
 # NetBSD/cats 3.1               OK  
 # NetBSD/evbarm 2.1             OK  
 # NetBSD/netwinder 3.1          OK  
 # NetBSD/prep 2.1               OK  
 # NetBSD/macppc 3.1             OK  
 # NetBSD/dreamcast 3.1 MD       OK  
 # NetBSD/dreamcast 3.1 LiveCD   OK  
 # Linux/dreamcast Live CD       OK  
 # OpenBSD/pmax 2.8-BETA         not tested because of lack of time  
 # OpenBSD/cats 4.0              OK  
 # OpenBSD/landisk 4.1           OK  
 # Ultrix/RISC 4.5               OK  
 # Sprite for DECstation         OK  
 # Debian GNU/Linux for pmax     not tested because of lack of time  
9    
10  Optional:          X  pmax (including X Windows out-of-the-box)
11  # OpenBSD/sgi                   FAILED to boot after setup (as expected)          X  arc  (1.6.2 -> 4.0! Yay!)
12               hpcmips
13               cobalt
14               evbmips
15               algor
16               sgimips
17               cats
18               evbarm
19               netwinder
20               prep         nej, 2.0 är senaste som funkar :(
21            X  macppc
22               pmppc
23            X  dreamcast
24            X  landisk
25    
26    X = done and worked fine
27    
28    -------------------------------------------------------------------------------
29    
30    Perform a second regression test pass, when the actual NetBSD 4.0 release
31    has happened.
32    
33            o)  Test all guest OSes.
34            o)  Update:
35                    URLs
36                    Versions
37    
38  --------------------------------------------          o)  Make a new GXemul release:  0.4.6.1
39    
40  Some things, in totally random order, that I'd like to fix:  -------------------------------------------------------------------------------
 (Some items in this list are possibly out-of-date by now.)  
41    
42  Dyntrans:  M88K:
43          x)  Instruction combination collisions? How to avoid easily...          o)  FIP != NIP + 4, in rte! (Simulate delayed branch stuff.)
44          x)  Think about how to do both SHmedia and SHcompact in a reasonable          o)  cpu_dyntrans.c: MEMORY_USER_ACCESS implementation for M88K!
45              way! (Or AMD64 long/protected/real, for that matter.)          o)  xmem: Set transaction registers!
46          x)  68K emulation; think about how to do variable instruction          o)  CMMUs:
47              lengths across page boundaries.                  o)  Translation invalidations, could be optimized.
48          x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,                  o)  Move initialization from dev_mvme187 to somewhere
49              it would be reasonably simple to add; in each individual fast                      more reasonable?
50              load/store routine = a lot more work, and it would become          o)  Instruction trace by using bits of ??IP control regs.
51              kludgy very fast.)          o)  Interrupts (these are machine dependent, though).
52          x)  Dyntrans with SMP... lots of work to be done here.          o)  Implement devices etc. for one or more machine modes,
53          x)  Dyntrans with cache emulation... lots of work here as well.              to get some guest OS running. OpenBSD/mvme88k on MVME187
54          x)  Remove the concept of base RAM completely; it would be more              seems to be the smartest path to follow for now.
55              generic to allow RAM devices to be used "anywhere".                  o)  VME bus device
56          o)  dev_mp doesn't work well with dyntrans yet                  o)  PCC2
57          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans                  o)  Cirrus Logic serial port controller
58          x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,          o)  Instruction disassembly, and implementation:
59                  so that it caches a translation (that is, an instruction                  o)  See http://www.panggih.staff.ugm.ac.id/download/GCC/info/gcc.i5
60                  word and the instr_call it was translated to the last                      for some strange cases of when "div" can fail (?)
61                  time), so that it doesn't need to do slow                  o)  Floating point stuff
62                  to_be_translated for each end of page?                  o)  "Graphics" instructions (M88110-specific)
         x)  Program Counter statistics:  
                 Per machine? What about SMP? All data to the same file?  
                 A debugger command should be possible to use to enable/  
                 disable statistics gathering.  
                 Configuration file option!  
         x)  Breakpoints:  
                 o) Physical vs virtual addresses!  
                 o) 32-bit vs 64-bit sign extension for MIPS, and others?  
         x)  INVALIDATION should cause translations in _all_ cpus to be  
             invalidated, e.g. on a write to a write-protected page  
             (containing code)  
         x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)  
         x)  Lots of other stuff: see src/cpus/README_DYNTRANS  
         x)  Native code generation backends:  
                 o)  think carefully about this.  
                 o)  simple syntax for emitting opcodes; backend implementation  
                     must be optional, so I don't have to write more code  
                     than necessary. after all, the non-native (C) code should  
                     always work.  
                 o)  convert into native code only after an entire  
                         block has been translated? probably best.  
                 o)  the "almost native" opcodes may be rearranged,  
                     "peep-hole optimized", etc. and then as a separate step  
                     this list of almost native opcodes is written out  
                     as native code.  
                 o)  think about delay slots at the end of a block!  
                 o)  x86/amd64 code generator can be very similar... perhaps  
                 o)  NOTE that generation is per _ABI_, not per host arch!  
                     the configure script must detect ABI!!!  
                 o)  branches to already translated code blocks can  
                         link the blocks together  
                 o)  load/store are the most important to optimize  
   
 Simple Valgrind-like checks?  
         o)  Mark every address with bits which tell whether or not the address  
             has been written to.  
         o)  What should happen when programs are loaded?  Text/data, bss (zero  
             filled). But stack space and heap is uninitialized.  
         o)  Uninitialized local variables:  
                 A load from a place on the stack which has not previously  
                 been stored to => warning. Increasing the stack pointer using  
                 any available means should reset the memory to uninitialized.  
         o)  If calls to malloc() and free() can be intercepted:  
                 o)  Access to a memory area after free() => warning.  
                 o)  Memory returned by malloc() is marked as not-initialized.  
                 o)  Non-passive, but good to have: Change the argument  
                     given to malloc, to return a slightly larger memory  
                     area, i.e.  margin_before + size + margin_after,  
                     and return the pointer  + margin_before.  
                     Any access to the margin_before or _after space results  
                     in warnings. (free() must be modified to free the  
                     actually allocated address.)  
63    
64  MIPS:  MIPS:
65          o)  Nicer MIPS status bits in register dumps.          o)  Nicer MIPS status bits in register dumps.
         o)  Alignment exceptions.  
66          o)  Floating point exception correctness.          o)  Floating point exception correctness.
67          o)  Fix this? Triggered by NetBSD/sgimips? Hm:          o)  Fix this? Triggered by NetBSD/sgimips? Hm:
68                  to_be_translated(): TODO: unimplemented instruction:                  to_be_translated(): TODO: unimplemented instruction:
# Line 122  MIPS: Line 70  MIPS:
70          o)  Some more work on opcodes.          o)  Some more work on opcodes.
71                  x) MIPS64 revision 2.                  x) MIPS64 revision 2.
72                          o)  Find out which actual CPUs implement the rev2 ISA!                          o)  Find out which actual CPUs implement the rev2 ISA!
73                            o)  DINS, DINSM, DINSU etc
74                          o)  DROTR32 and similar MIPS64 rev 2 instructions,                          o)  DROTR32 and similar MIPS64 rev 2 instructions,
75                              which have a rotation bit which differs from                              which have a rotation bit which differs from
76                              previous ISAs.                              previous ISAs.
                         o)  EI and DI instructions for MIPS64/32 rev 2.  
                             NOTE: These are _NOT_ the same as for R5900!  
77                  x) _MAYBE_ TX79 and R5900 actually differ in their                  x) _MAYBE_ TX79 and R5900 actually differ in their
78                     opcodes? Check this carefully!                     opcodes? Check this carefully!
79          o)  Dyntrans: Count register updates are probably not 100% correct yet.          o)  Dyntrans: Count register updates are probably not 100% correct yet.
         o)  Refactor code for performance and readability/maintainability.  
80          o)  (Re)implement 128-bit loads/stores for R5900.          o)  (Re)implement 128-bit loads/stores for R5900.
81            o)  Coprocessor 1x (i.e. 3) should cause cp1 exceptions, not 3?
82                    (See http://lists.gnu.org/archive/html/qemu-devel/2007-05/msg00005.html)
83          o)  R4000 and others:          o)  R4000 and others:
84                  x)  watchhi/watchlo exceptions, and other exception                  x)  watchhi/watchlo exceptions, and other exception
85                      handling details                      handling details
86            o)  MIPS 5K* have 42 physical address bits, not 40/44?
87          o)  R10000 and others:  (R12000, R14000 ?)          o)  R10000 and others:  (R12000, R14000 ?)
88                  x)  The code before the line                  x)  The code before the line
89                          /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */                          /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */
# Line 149  MIPS: Line 98  MIPS:
98                      (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)
99    
100  SuperH:  SuperH:
101          x)  SH4 performance is VERY low when running user-space instructions,          x)  Auto-generation of loads/stores! This should get rid of at least
102              because I actually simulate the 4-entry ITLB as being separate              the endianness check in each load/store.
103              from the 64-entry DTLB. This is correct, but VERY slow. I need          x)  Experiment with whether or not correct ITLB emulation is
104              to experiment with _not_ simulating it in too much detail.              actually needed. (20070522: I'm turning it off today.)
105          x)  SH4 interrupt controller:          x)  SH4 interrupt controller:
106                  x)  MASKING should be possible!                  x)  MASKING should be possible!
107          x)  SH4 DMA (0xffa00000)          x)  SH4 DMA (0xffa00000)
# Line 163  SuperH: Line 112  SuperH:
112          x)  Instruction tracing should include symbols for branch targets,          x)  Instruction tracing should include symbols for branch targets,
113              and so on, to make the output more human readable.              and so on, to make the output more human readable.
114          x)  SH3-specific devices: Pretty much everything!          x)  SH3-specific devices: Pretty much everything!
115          x)  NetBSD/evbsh3, mmeye, hpcsh! Linux?          x)  NetBSD/evbsh3, hpcsh! Linux?
         x)  Replace pc-relative loads with immediate load, if within the  
             same page. (Similar to the same optimization for ARM.)  
116          x)  Floating point speed!          x)  Floating point speed!
117          x)  Floating point exception correctness.          x)  Floating point exception correctness.
         x)  NetBSD HEAD (as of April 2007) hangs during bootup, because it  
             turns on/off interrupts in an unfortunately synchronized way  
             with dyntrans. This needs to be fixed.  
118          x)  Exceptions for unaligned load/stores. OpenBSD/landisk uses          x)  Exceptions for unaligned load/stores. OpenBSD/landisk uses
119              this mechanism for its reboot code (machine_reset).              this mechanism for its reboot code (machine_reset).
         x)  Think carefully about how to implement SH5/SH64 (for evbsh5).  
120    
121  Landisk SH4:  Landisk SH4:
122          x)  When NetBSD/landisk 4.0 has been released, make sure it works          x)  When NetBSD/landisk 4.0 has been released, make sure it works
123              in the emulator. (Update documentation, etc.)              in the emulator. (Update documentation, etc.)
124                NetBSD HEAD (as of April 2007) hangs during bootup, because it
125                turns on/off interrupts in an unfortunately synchronized way
126                with dyntrans. This needs to be fixed.
127    
128  Dreamcast:  Dreamcast:
129          x)  G2 DMA          x)  G2 DMA
# Line 222  SPARC (both the ISA and the machines): Line 168  SPARC (both the ISA and the machines):
168          o)  SPARC v8, v7 etc?          o)  SPARC v8, v7 etc?
169          o)  More machine modes and devices.          o)  More machine modes and devices.
170    
 Debugger:  
         o)  How does SMP debugging work? Does it simply use "threads"?  
                 What if the guest OS (running on an emulated SMP machine)  
                 has a usertask running, with userland threads?  
         o)  Try to make the debugger more modular and, if possible, reentrant!  
         o)  Remove the emul command? (But show network info if showing  
                 machines?)  
         o)  Evaluate expressions within []? That would allow stuff like  
                 cpu[x] where x is an expression.  
         o)  Settings:  
                 x)  Special handlers for Write!  
                         +)  MIPS coproc regs  
                         +)  Alpha/MIPS/SPARC zero registers  
                         +)  x86 64/32/16-bit registers  
                 x)  Value formatter for resulting output.  
         o)  see src/debugger.c for more  
   
171  POWER/PowerPC:  POWER/PowerPC:
172          x)  Fix DECR timer speed, so it matches the host.          x)  Fix DECR timer speed, so it matches the host.
173          x)  NetBSD/prep 3.x triggers a possible bug in the emulator:          x)  NetBSD/prep 3.x triggers a possible bug in the emulator:
# Line 276  BeBox: Line 205  BeBox:
205              "after a short while", although a few interrupts get through?              "after a short while", although a few interrupts get through?
206          o)  Perhaps find a copy of BeOS and try it?          o)  Perhaps find a copy of BeOS and try it?
207    
208    Malta:
209            o)  The Linux/Malta kernel at people.debian.org/~ths/qemu/malta/
210                almost works:
211                    ./gxemul -x -o 'rd_start=0x80800000 rd_size=10000000 init=/bin/sh' -C 4KEc
212                      -e malta 0x80800000:people.debian.org/~ths/qemu/malta/initrd.gz
213                      people.debian.org/~ths/qemu/malta/vmlinux
214                (Remove "init=/bin/sh" to boot into the Debian installer.)
215                There are at least two things that need to be fixed:
216                    1. PCI IDE; make Linux oops.
217                    2. Implement the NIC.
218    
219  HPCmips:  HPCmips:
220          x)  Mouse/pad support! :)          x)  Mouse/pad support! :)
221          x)  A NIC? (As a PCMCIA device?)          x)  A NIC? (As a PCMCIA device?)
222    
 M88K:  
         o)  Everything. :)  
                 o)  More instruction disassembly!  
                 o)  Implement more instructions.  
                 o)  has-delay-slot (for debugging)  
                 o)  Find manuals!  
                 o)  MMU stuff  
                 o)  Exceptions  
                 o)  FPU  
                 o)  Control registers  
   
 AVR:  
         o)  Everything.  
   
223  ARM:  ARM:
224          o)  See netwinder_reset() in NetBSD; the current "an internal error          o)  See netwinder_reset() in NetBSD; the current "an internal error
225              occured" message after reboot/halt is too ugly.              occured" message after reboot/halt is too ugly.
226          o)  ARM "wait"-like instruction?          o)  Generic ARM "wait"-like instruction?
227          o)  try to get netbsd/evbarm 3.x or 4.x running (iq80321)          o)  try to get netbsd/evbarm 3.x or 4.x running (iq80321)
228          o)  make the xscale counter registers (ccnt) work          o)  make the xscale counter registers (ccnt) work
229          o)  make the ata controller usable for FreeBSD!          o)  make the ata controller usable for FreeBSD!
         o)  Zaurus emulation:  
                 x)  OpenBSD/zaurus  
                 x)  NetBSD/zaurus? See the following URL:  
                     http://mail-index.netbsd.org/port-arm/2006/11/19/0000.html  
230          o)  Debian/cats crashes because of unimplemented coproc stuff.          o)  Debian/cats crashes because of unimplemented coproc stuff.
231              fix this?              fix this?
232    
# Line 319  Test machines: Line 241  Test machines:
241                          halt();                          halt();
242                  }                  }
243    
244    Debugger:
245            o)  How does SMP debugging work? Does it simply use "threads"?
246                What if the guest OS (running on an emulated SMP machine)
247                has a usertask running, with userland threads?
248            o)  Try to make the debugger more modular and, if possible, reentrant!
249            o)  Memory dumps should be able to dump both physical and
250                virtual emulated memory.
251            o)  Evaluate expressions within []? That would allow stuff like
252                cpu[x] where x is an expression.
253            o)  "pc = pc + 4" doesn't work! Bug. Should work. ("pc=pc+4" works.)
254            o)  Settings:
255                    x)  Special handlers for Write!
256                            +)  MIPS coproc regs
257                            +)  Alpha/MIPS/SPARC zero registers
258                            +)  x86 64/32/16-bit registers
259                    x)  Value formatter for resulting output.
260            o)  Call stack display (back-trace) of emulated programs.
261            o)  Nicer looking output of register dumps, floating point registers,
262                etc. Warn about weird/invalid register contents.
263            o)  Ctrl-C doesn't enter the debugger on some OSes (HP-UX?)...
264    
265    Dyntrans:
266            x)  NOTE: ARM etc. that load pc-relative constants, on writes to
267                pages that contain translations, the ENTIRE page must be
268                invalidated, not just the 1/32th that was code.
269            x)  For 32-bit emulation modes, that have emulated TLBs: tlbindex
270                arrays of mapped pages? Things to think about:
271                    x)  Only 32-bit mode! (64-bit => too much code)
272                    x)  One array for global pages, and one array _PER ASID_,
273                        for those archs that support that. On M88K, there should
274                        be one array for userspace, and one for supervisor, etc.
275                    x)  Larger-than-4K-pages must fill several bits in the array.
276                    x)  No TLB search will be necessary.
277                    x)  Total host space used, for 4 KB pages: 1 MB per table,
278                        i.e. 65 MB for 32-bit MIPS, 2 MB for M88K, if one byte
279                        is used as the tlb index.
280                    x)  (The index is actually +1, so that 0 means no hit.)
281            x)  "Merge" the cur_physpage and cur_ic_page variables/pointers to
282                one? I.e. change cur_ic_page to cur_physpage.ic_page or something.
283            x)  Instruction combination collisions? How to avoid easily...
284            x)  superh -- no hostpage for e.g. 0x8c000000. devices as ram!
285            x)  Think about how to do both SHmedia and SHcompact in a reasonable
286                way! (Or AMD64 long/protected/real, for that matter.)
287            x)  68K emulation; think about how to do variable instruction
288                lengths across page boundaries.
289            x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,
290                it would be reasonably simple to add; in each individual fast
291                load/store routine = a lot more work, and it would become
292                kludgy very fast.)
293            x)  Dyntrans with SMP... lots of work to be done here.
294            x)  Dyntrans with cache emulation... lots of work here as well.
295            x)  Remove the concept of base RAM completely; it would be more
296                generic to allow RAM devices to be used "anywhere".
297            o)  dev_mp doesn't work well with dyntrans yet
298            o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
299            x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,
300                    so that it caches a translation (that is, an instruction
301                    word and the instr_call it was translated to the last
302                    time), so that it doesn't need to do slow
303                    to_be_translated for each end of page?
304            x)  Program Counter statistics:
305                    Per machine? What about SMP? All data to the same file?
306                    A debugger command should be possible to use to enable/
307                    disable statistics gathering.
308                    Configuration file option!
309            x)  Breakpoints:
310                    o) Physical vs virtual addresses!
311                    o) 32-bit vs 64-bit sign extension for MIPS, and others?
312            x)  INVALIDATION should cause translations in _all_ cpus to be
313                invalidated, e.g. on a write to a write-protected page
314                (containing code)
315            x)  16-bit encodings? (MIPS16, ARM Thumb, etc)
316            x)  Lots of other stuff: see src/cpus/README_DYNTRANS
317            x)  Native code generation backends... think carefully about this.
318    
319    Simple Valgrind-like checks?
320            o)  Mark every address with bits which tell whether or not the address
321                has been written to.
322            o)  What should happen when programs are loaded?  Text/data, bss (zero
323                filled). But stack space and heap is uninitialized.
324            o)  Uninitialized local variables:
325                    A load from a place on the stack which has not previously
326                    been stored to => warning. Increasing the stack pointer using
327                    any available means should reset the memory to uninitialized.
328            o)  If calls to malloc() and free() can be intercepted:
329                    o)  Access to a memory area after free() => warning.
330                    o)  Memory returned by malloc() is marked as not-initialized.
331                    o)  Non-passive, but good to have: Change the argument
332                        given to malloc, to return a slightly larger memory
333                        area, i.e.  margin_before + size + margin_after,
334                        and return the pointer  + margin_before.
335                        Any access to the margin_before or _after space results
336                        in warnings. (free() must be modified to free the
337                        actually allocated address.)
338    
339  Better CD Image file support:  Better CD Image file support:
340          x)  Support CD formats that contain more than 1 track, e.g.          x)  Support CD formats that contain more than 1 track, e.g.
341              CDI files (?). These can then contain a mixture of e.g. sound              CDI files (?). These can then contain a mixture of e.g. sound
# Line 369  Cache simulation: Line 386  Cache simulation:
386              is another option (easier to implement, but very very slow).              is another option (easier to implement, but very very slow).
387    
388  Documentation:  Documentation:
389            x)  Update the documentation regarding the testmachine interrupts.
390          x)  Note about sandboxing/security:          x)  Note about sandboxing/security:
391                  Not all emulated instructions fail in the way they would                  Not all emulated instructions fail in the way they would
392                  do on real hardware (e.g. a userspace program writing to                  do on real hardware (e.g. a userspace program writing to
# Line 378  Documentation: Line 396  Documentation:
396                  securely".                  securely".
397          x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)          x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)
398          x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!          x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!
         x)  BETTER DEVICE EXAMPLES!  
                 o)  Move away from technical.html to somewhere new.  
                 o)  DEVICE_TICK  
                 o)  Implement example devices using interrupts, dyntrans  
                     memory access, etc.?  
         x)  Document the dyntrans core?  
399          x)  Rewrite the section about experimental devices, after the          x)  Rewrite the section about experimental devices, after the
400              framebuffer acceleration has been implemented, and demos              framebuffer acceleration has been implemented, and demos
401              written. (Symbolic names instead of numbers; example              written. (Symbolic names instead of numbers; example
# Line 392  Documentation: Line 404  Documentation:
404          x)  "a very simple linear framebuffer device (for graphics output)"          x)  "a very simple linear framebuffer device (for graphics output)"
405              under "which machines does gxemul emulate" ==> better              under "which machines does gxemul emulate" ==> better
406              description?              description?
         x)  Better description on how to set up a cross compiler?  
             Example for MIPS64.  
         o)  Automagic documentation generation?  
                 x)  machines, cpus, devices.  
                 x)  REMEMBER that several machines/devices can be in  
                         the same source file!  
         o)  Try to rewrite the install instructions for those machines  
             that use 3MAX into using CATS or hpcmips? (To remove the need  
             to use a raw ffs partition, using up all of the disk image.)  
   
 More generic out_of_memory error reporting, and check everywhere!  
         Causes: OpenBSD has low default limits for normal users.  
                 Host is 32-bit? (32-bit hosts are limited to 4 GB or less  
                 of userspace memory.)  
                 You are actually low on RAM. (As trivial as this might sound,  
                 Unix systems usually allow processes to allocate virtual  
                 memory beyond the amount of RAM in the machine.)  
407    
408  The Device subsystem:  The Device subsystem:
409          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
# Line 418  The Device subsystem: Line 413  The Device subsystem:
413              registering new devices, and for moving existing ones.              registering new devices, and for moving existing ones.
414              cpu->invalidate translation caches, for all CPUs that              cpu->invalidate translation caches, for all CPUs that
415              are connected to a specific memory.              are connected to a specific memory.
         x)  keep track of interrupts and busses? actually, allowing any device  
             to be a bus might be a nice idea.  
         x)  turn interrupt controllers into devices? :-)  
         x)  refactor various clocks/nvram/cmos into one device?  
416    
417  PCI:  PCI:
418          x)  Pretty much everything related to runtime configuration, device          x)  Pretty much everything related to runtime configuration, device
# Line 443  PCI: Line 434  PCI:
434  Clocks and timers:  Clocks and timers:
435          x)  Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)          x)  Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)
436          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
437          x)  Test the 8253? Right now it doesn't seem to be used?          x)  NetWinder timeofday is incorrect! Huh? grep -R for ta_rtc_read in
438          x)  NetWinder timeofday is incorrect! It seems to be exactly              NetBSD sources; it doesn't seem to be initialized _AT ALL_?!
             1 day ahead of actual time?  
439          x)  Cobalt TOD is incorrect!          x)  Cobalt TOD is incorrect!
440          x)  Go through all other machines, one by one, and fix them.          x)  Go through all other machines, one by one, and fix them.
441    
# Line 464  Floating point layer: Line 454  Floating point layer:
454          o)  non-IEEE modes (i.e. x86)?          o)  non-IEEE modes (i.e. x86)?
455    
456  Userland emulation:  Userland emulation:
457            x)  Try to prefix "/emul/mips/" or similar to all filenames,
458                and only if that fails, try the given filename.
459                Read this setting from an environment variable, and only
460                if there is none, fall back to hardcoded string.
461            x)  File descriptor (0,1,2) assumptions? Find and fix these?
462          x)  Dynamic linking!          x)  Dynamic linking!
463          x)  Lots of stuff; freebsd, netbsd, linux, ... syscalls.          x)  Lots of stuff; freebsd, netbsd, linux, ... syscalls.
464          x)  Initial register/stack contents (environment, command line args).          x)  Initial register/stack contents (environment, command line args).
465          x)  Return value (from main).          x)  Return value (from main).
466          x)  mmap emulation layer          x)  mmap emulation layer
467          x)  errno emulation layer          x)  errno emulation layer
468          x)  struct conversions for may syscalls          x)  ioctl emulation layer for all devices :-[
469            x)  struct conversions for many syscalls
470    
471  Sound:  Sound:
472          x)  generic sound framework          x)  generic sound framework
# Line 506  File/disk/symbol handling: Line 502  File/disk/symbol handling:
502              (Perhaps this needs a reasonably large re-write.)              (Perhaps this needs a reasonably large re-write.)
503          o)  Remove some of the complexity in file format guessing, for          o)  Remove some of the complexity in file format guessing, for
504                  Ultrix kernels that are actually disk images?                  Ultrix kernels that are actually disk images?
505            o)  Remove temporary files (/tmp/gxemul.blahblah) if loading fails
506                for some reason (unrecognized file, etc).
507          o)  Better handling of tape files                o)  Better handling of tape files      
508          o)  Read function argument count and types from binaries? (ELF?)          o)  Read function argument count and types from binaries? (ELF?)
509          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.
# Line 516  Userland ABI emulation: Line 514  Userland ABI emulation:
514          o)  see src/useremul.c          o)  see src/useremul.c
515    
516  Better framebuffer and X-windows functionality:  Better framebuffer and X-windows functionality:
517            o)  Do a complete rewrite of the framebuffer/console stuff, so that:
518                    1)  It does not rely on X11 specifically.
519                    2)  It is possible to interact with emulated framebuffers
520                        and consoles "remotely", e.g. via a web page which
521                        controls multiple virtualized machines.
522                    3)  It is possible to run on (hypothetical) non-X11
523                        graphics systems.
524          o)  Generalize the update_x1y1x2y2 stuff to an extend-region()          o)  Generalize the update_x1y1x2y2 stuff to an extend-region()
525              function...              function...
526          o)  -Yx sometimes causes crashes.          o)  -Yx sometimes causes crashes.
# Line 540  Better framebuffer and X-windows functio Line 545  Better framebuffer and X-windows functio
545                      to change the font of an xterm in X in the                      to change the font of an xterm in X in the
546                      emulator)                      emulator)
547          o)  Generalize the framebuffer stuff by moving _ALL_ X11          o)  Generalize the framebuffer stuff by moving _ALL_ X11
548                  specific code to src/x11.c!                  specific code to a separate module.
549    
550    -------------------------------------------------------------------------------
551    
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