/[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 34 by dpavlin, Mon Oct 8 16:21:17 2007 UTC revision 42 by dpavlin, Mon Oct 8 16:22:32 2007 UTC
# Line 1  Line 1 
1  $Id: TODO,v 1.453 2007/02/19 01:34:42 debug Exp $  $Id: TODO,v 1.536 2007/06/15 22:30:17 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.)
 Fix after the 0.4.4 release:  
         Fix the PowerPC DECR interrupt speed!  
   
 -------------------------------------------------------------------------------  
   
 Possible (relatively large) work packages to concentrate on in the future:  
   
   x)  SMP:  
         Get SMP working again. It is pretty much broken since I started  
         the conversion from the old bintrans system to the new dyntrans system.  
         Add better Test machine demos for SMP in the demos directory.  
   
   x)  Network:  
         Redesign of the networking subsystem, at least the NAT translation  
         part. The current way of allowing raw ethernet frames to be  
         transfered to/from the emulator via UDP should probably be extended  
         to allow the frames to be transmitted other ways as well.  
         Also adding support for connecting ttys (either to xterms, or to  
         pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).  
   
   x)  PCI:  
         Pretty much everything related to runtime configuration, device  
         slots, interrupts, whatever. The current code is very hardcoded  
         and ugly.  
   
   x)  Debugging:  
         Think more about SMP debugging, etc. Right now, the  
         debugger is a mess. Also, a better connection to GDB would be  
         very nice to have.  
5    
6    x)  Userland emulation:  M88K:
7          Primary goals would be NetBSD and Linux syscall emulation.          o)  Neither NIP nor FIP valid in rte?
8            o)  FIP != NIP + 4, in rte! (Simulate delayed branch stuff.)
9  And of course, there are _LOTS_ of minor TODOs spread out throughout          o)  cpu_dyntrans.c: MEMORY_USER_ACCESS implementation for M88K!
10  the source code, which must be fixed sooner or later.          o)  xmem: Set transaction registers!
11            o)  CMMUs:
12  -------------------------------------------------------------------------------                  o)  Translation invalidations, could be optimized.
13                    o)  Move initialization from dev_mvme187 to somewhere
14  Some other things, in random order, that I'd like to fix: (Some items in                      more reasonable?
15  this list are probably out-to-date by now.)          o)  Instruction trace by using bits of ??IP control regs.
16            o)  Interrupts (these are machine dependent, though).
17  Dyntrans:          o)  Implement devices etc. for one or more machine modes,
18          x)  Instruction combination collisions? How to avoid easily...              to get some guest OS running. OpenBSD/mvme88k on MVME187
19          x)  Think about how to do both SHmedia and SHcompact in a reasonable              seems to be the smartest path to follow for now.
20              way! (Or AMD64 long/protected/real, for that matter.)                  o)  VME bus device
21          x)  68K emulation; think about how to do variable instruction                  o)  PCC2
22              lengths across page boundaries.                  o)  Cirrus Logic serial port controller
23          x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,          o)  Instruction disassembly, and implementation:
24              it would be reasonably simple to add; in each individual fast                  o)  See http://www.panggih.staff.ugm.ac.id/download/GCC/info/gcc.i5
25              load/store routine = a lot more work, and it would become                      for some strange cases of when "div" can fail (?)
26              kludgy very fast.)                  o)  Floating point stuff
27          x)  Dyntrans with SMP... lots of work to be done here.                  o)  "Graphics" instructions (M88110-specific)
         x)  Dyntrans with cache emulation... lots of work here as well.  
         o)  dev_mp doesn't work well with dyntrans yet  
         o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans  
         x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,  
                 so that it caches a translation (that is, an instruction  
                 word and the instr_call it was translated to the last  
                 time), so that it doesn't need to do slow  
                 to_be_translated for each end of page?  
         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)  true recompilation backend? think carefully about this.  
                 o)  abstract syntax for emitting opcopdes  
                 o)  convert into native code only after an entire  
                         block has been translated? probably best.  
                 o)  x86/amd64 code generator can be very similar... perhaps  
                 o)  branches to already translated code blocks can  
                         link the blocks together  
                 o)  load/store are the most important.  
   
 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.)  
28    
29  MIPS:  MIPS:
30          o)  Nicer MIPS status bits in register dumps.          o)  Nicer MIPS status bits in register dumps.
         o)  Alignment exceptions.  
31          o)  Floating point exception correctness.          o)  Floating point exception correctness.
32          o)  Fix this? Triggered by NetBSD/sgimips? Hm:          o)  Fix this? Triggered by NetBSD/sgimips? Hm:
33                  to_be_translated(): TODO: unimplemented instruction:                  to_be_translated(): TODO: unimplemented instruction:
# Line 114  MIPS: Line 35  MIPS:
35          o)  Some more work on opcodes.          o)  Some more work on opcodes.
36                  x) MIPS64 revision 2.                  x) MIPS64 revision 2.
37                          o)  Find out which actual CPUs implement the rev2 ISA!                          o)  Find out which actual CPUs implement the rev2 ISA!
38                            o)  DINS, DINSM, DINSU etc
39                          o)  DROTR32 and similar MIPS64 rev 2 instructions,                          o)  DROTR32 and similar MIPS64 rev 2 instructions,
40                              which have a rotation bit which differs from                              which have a rotation bit which differs from
41                              previous ISAs.                              previous ISAs.
                         o)  EI and DI instructions for MIPS64/32 rev 2.  
                             NOTE: These are _NOT_ the same as for R5900!  
42                  x) _MAYBE_ TX79 and R5900 actually differ in their                  x) _MAYBE_ TX79 and R5900 actually differ in their
43                     opcodes? Check this carefully!                     opcodes? Check this carefully!
44          o)  Dyntrans: Count register updates are probably not 100% correct yet.          o)  Dyntrans: Count register updates are probably not 100% correct yet.
45          o)  Refactor code for performance and readability/maintainability.          o)  Refactor code for performance and readability/maintainability.
46          o)  (Re)implement 128-bit loads/stores for R5900.          o)  (Re)implement 128-bit loads/stores for R5900.
47            o)  Coprocessor 1x (i.e. 3) should cause cp1 exceptions, not 3?
48                    (See http://lists.gnu.org/archive/html/qemu-devel/2007-05/msg00005.html)
49          o)  R4000 and others:          o)  R4000 and others:
50                  x)  watchhi/watchlo exceptions, and other exception                  x)  watchhi/watchlo exceptions, and other exception
51                      handling details                      handling details
52            o)  MIPS 5K* have 42 physical address bits, not 40/44?
53          o)  R10000 and others:  (R12000, R14000 ?)          o)  R10000 and others:  (R12000, R14000 ?)
54                  x)  The code before the line                  x)  The code before the line
55                          /*  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 135  MIPS: Line 58  MIPS:
58                      register definitions according to http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_263.html#HEADING334                      register definitions according to http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_263.html#HEADING334
59                      and make sure everything works with R10000.                      and make sure everything works with R10000.
60                      Then test with OpenBSD/sgi?                      Then test with OpenBSD/sgi?
61                    x)  Entry LO mask (as above).
62                  x)  memory space, exceptions, ...                  x)  memory space, exceptions, ...
63                  x)  use cop0 framemask for tlb lookups                  x)  use cop0 framemask for tlb lookups
64                      (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)
65    
66  SuperH:  SuperH:
67            x)  Auto-generation of loads/stores! This should get rid of at least
68                the endianness check in each load/store.
69            x)  Experiment with whether or not correct ITLB emulation is
70                actually needed. (20070522: I'm turning it off today.)
71          x)  SH4 interrupt controller:          x)  SH4 interrupt controller:
72                  x)  Implement correct priorities of interrupts                  x)  MASKING should be possible!
73          x)  SH4 DMA (0xffa00000)          x)  SH4 DMA (0xffa00000)
74          x)  SH4 UBC (0xff200000)          x)  SH4 UBC (0xff200000)
75          x)  Store queues can copy 32 bytes at a time, there's no need to          x)  Store queues can copy 32 bytes at a time, there's no need to
76              copy individual 32-bit words. (Performance improvement.)              copy individual 32-bit words. (Performance improvement.)
77          x)  SH4 BSC (Bus State Controller)          x)  SH4 BSC (Bus State Controller)
         x)  SH4 RTC: Read the host's clock.  
         x)  SH4 SCIF: Serial _interrupts_  
78          x)  Instruction tracing should include symbols for branch targets,          x)  Instruction tracing should include symbols for branch targets,
79              and so on, to make the output more human readable.              and so on, to make the output more human readable.
80          x)  NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?          x)  SH3-specific devices: Pretty much everything!
81          x)  Replace pc-relative loads with immediate load, if within the          x)  NetBSD/evbsh3, hpcsh! Linux?
             same page. (Similar to the same optimization for ARM.)  
82          x)  Floating point speed!          x)  Floating point speed!
83          x)  Floating point exception correctness.          x)  Floating point exception correctness.
84            x)  NetBSD HEAD (as of April 2007) hangs during bootup, because it
85                turns on/off interrupts in an unfortunately synchronized way
86                with dyntrans. This needs to be fixed.
87            x)  Exceptions for unaligned load/stores. OpenBSD/landisk uses
88                this mechanism for its reboot code (machine_reset).
89          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).
90    
91    Landisk SH4:
92            x)  When NetBSD/landisk 4.0 has been released, make sure it works
93                in the emulator. (Update documentation, etc.)
94    
95  Dreamcast:  Dreamcast:
96          x)  G2 DMA          x)  G2 DMA
97          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
98          x)  PVR:  Lots of stuff. See dev_pvr.c.          x)  PVR:  Lots of stuff. See dev_pvr.c.
99          x)  GDROM          x)  Better GDROM support
100          x)  Modem          x)  Modem
101          x)  PCI bridge/bus?          x)  PCI bridge/bus?
102          x)  Maple bus:          x)  Maple bus:
# Line 172  Dreamcast: Line 106  Dreamcast:
106                  x)  GD-ROM emulation: Use the GDROM device.                  x)  GD-ROM emulation: Use the GDROM device.
107                  x)  Use the VGA font as a fake ROM font. (Better than                  x)  Use the VGA font as a fake ROM font. (Better than
108                      nothing.)                      nothing.)
         x)  Linux/dreamcast? (The gentoo kernel currently crashes.)  
109          x)  Make as many as possible of the KOS examples run!          x)  Make as many as possible of the KOS examples run!
110          x)  More homebrew demos/games.          x)  More homebrew demos/games.
111          x)  SPU: Sound emulation (ARM cpu).          x)  SPU: Sound emulation (ARM cpu).
# Line 181  Dreamcast: Line 114  Dreamcast:
114              http://www.maushammer.com/vmu.html for a good description of              http://www.maushammer.com/vmu.html for a good description of
115              the differences between LC86104C and the one used in the VME.              the differences between LC86104C and the one used in the VME.
116    
 Transputer:  
         x)  Implement support for Helios binaries.  
         x)  Stack and register contents at startup?  
         x)  Figure out how to boot an entire Helios distribution.  
         x)  Implement all instructions. :)  
   
 RCA1802/RCA1805, CHIP8:  
         x)  CHIP8 -> RCA180x conversion  
                 x)  Think about how to do dual-mode, variable-instr-length  
                     ISAs, and switch between modes.  
                 x)  1805 "extended" opcode -> trigger CHIP8 emulation?  
                         That is, all calls 0NNN could point to 0x68 opcodes,  
                         which, if running on a 1802 in CHIP8-emulation-mode,  
                         would be manually interpreted.  
                 x)  Better solution:  
                         CHIP8 calls to 00xx => handle at high level,  
                               calls to 0xxx in general = call 180X machine code  
                                 (0000 = reboot?)  
         x)  1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html  
             and:  http://www.elf-emulation.com/1802.html  
         x)  1805 extended opcodes: Implement at least disassembly support!  
         x)  Keyboard input.  
         x)  Sound (beep only).  
         x)  Slow-down to correct speed? Wikipedia: "it was usually operated  
             at 3.58 MHz/2 to suit the requirements of the 1861 chip which  
             gave a speed of a little over 100,000 instructions per second"  
             (Note that _CHIP8_ emulation would then be even slower.)  
         x)  SCHIP48 (Super) emulation:  
                 Some more opcodes, 128x64 framebuffer, larger  
                 sprites and fonts.  
   
117  Alpha:  Alpha:
118          x)  OSF1 PALcode, Virtual memory support.          x)  OSF1 PALcode, Virtual memory support.
119          x)  PALcode replacement! PAL1E etc opcodes...?          x)  PALcode replacement! PAL1E etc opcodes...?
# Line 221  Alpha: Line 123  Alpha:
123          x)  More Alpha machine types, so it could work with          x)  More Alpha machine types, so it could work with
124              OpenBSD, FreeBSD, and Linux too?              OpenBSD, FreeBSD, and Linux too?
125    
126  SPARC:  SPARC (both the ISA and the machines):
127          o)  Implement Adress space identifiers; load/stores etc.          o)  Implement Adress space identifiers; load/stores etc.
128            o)  Exception/trap/interrupt handling.
129          o)  Save/restore register windows etc! Both v9 and pre-v9!          o)  Save/restore register windows etc! Both v9 and pre-v9!
130          o)  Finish the subcc and addcc flag computation code.          o)  Finish the subcc and addcc flag computation code.
131          o)  Add more registers (floating point, control regs etc)          o)  Add more registers (floating point, control regs etc)
         o)  Exception/trap handling.  
132          o)  Disassemly of some more instructions?          o)  Disassemly of some more instructions?
133          o)  Are sll etc 32-bit sign-extending or zero-extending?          o)  Are sll etc 32-bit sign-extending or zero-extending?
134          o)  Finish the GDB register stuff.          o)  Floating point exception correctness.
         x)  Floating point exception correctness.  
135          o)  SPARC v8, v7 etc?          o)  SPARC v8, v7 etc?
136            o)  More machine modes and devices.
 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  
137    
138  POWER/PowerPC:  POWER/PowerPC:
139          x)  Fix DECR timer speed, so it matches the host.          x)  Fix DECR timer speed, so it matches the host.
# Line 276  POWER/PowerPC: Line 161  POWER/PowerPC:
161          x)  Alignment exceptions.          x)  Alignment exceptions.
162    
163  PReP:  PReP:
164          Clock time! ("Bad battery blah blah")          x)  Clock time! ("Bad battery blah blah")
165    
166  Algor:  Algor:
167          o)  Other models than the P5064?          o)  Other models than the P5064?
# Line 291  HPCmips: Line 176  HPCmips:
176          x)  Mouse/pad support! :)          x)  Mouse/pad support! :)
177          x)  A NIC? (As a PCMCIA device?)          x)  A NIC? (As a PCMCIA device?)
178    
 AVR:  
         o)  Everything.  
   
179  ARM:  ARM:
180          o)  See netwinder_reset() in NetBSD; the current "an internal error          o)  See netwinder_reset() in NetBSD; the current "an internal error
181              occured" message after reboot/halt is too ugly.              occured" message after reboot/halt is too ugly.
182          o)  ARM "wait"-like instruction?          o)  Generic ARM "wait"-like instruction?
183          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)
184          o)  make the xscale counter registers (ccnt) work          o)  make the xscale counter registers (ccnt) work
185          o)  make the ata controller usable for FreeBSD!          o)  make the ata controller usable for FreeBSD!
         o)  Zaurus emulation, for e.g. OpenBSD/zaurus  
186          o)  Debian/cats crashes because of unimplemented coproc stuff.          o)  Debian/cats crashes because of unimplemented coproc stuff.
187              fix this?              fix this?
188    
# Line 316  Test machines: Line 197  Test machines:
197                          halt();                          halt();
198                  }                  }
199    
200    Debugger:
201            o)  How does SMP debugging work? Does it simply use "threads"?
202                What if the guest OS (running on an emulated SMP machine)
203                has a usertask running, with userland threads?
204            o)  Try to make the debugger more modular and, if possible, reentrant!
205            o)  Remove the emul command? (But show network info if showing
206                machines?)
207            o)  Memory dumps should be able to dump both physical and
208                virtual emulated memory.
209            o)  Evaluate expressions within []? That would allow stuff like
210                cpu[x] where x is an expression.
211            o)  "pc = pc + 4" doesn't work! Bug. Should work. ("pc=pc+4" works.)
212            o)  Settings:
213                    x)  Special handlers for Write!
214                            +)  MIPS coproc regs
215                            +)  Alpha/MIPS/SPARC zero registers
216                            +)  x86 64/32/16-bit registers
217                    x)  Value formatter for resulting output.
218            o)  Call stack display (back-trace) of emulated programs.
219            o)  Nicer looking output of register dumps, floating point registers,
220                etc. Warn about weird/invalid register contents.
221            o)  Ctrl-C doesn't enter the debugger on some OSes (HP-UX?)...
222    
223    Dyntrans:
224            x)  For 32-bit emulation modes, that have emulated TLBs: tlbindex
225                arrays of mapped pages? Things to think about:
226                    x)  Only 32-bit mode! (64-bit => too much code)
227                    x)  One array for global pages, and one array _PER ASID_,
228                        for those archs that support that. On M88K, there should
229                        be one array for userspace, and one for supervisor, etc.
230                    x)  Larger-than-4K-pages must fill several bits in the array.
231                    x)  No TLB search will be necessary.
232                    x)  Total host space used, for 4 KB pages: 1 MB per table,
233                        i.e. 65 MB for 32-bit MIPS, 2 MB for M88K, if one byte
234                        is used as the tlb index.
235                    x)  (The index is actually +1, so that 0 means no hit.)
236            x)  "Merge" the cur_physpage and cur_ic_page variables/pointers to
237                one? I.e. change cur_ic_page to cur_physpage.ic_page or something.
238            x)  Instruction combination collisions? How to avoid easily...
239            x)  Think about how to do both SHmedia and SHcompact in a reasonable
240                way! (Or AMD64 long/protected/real, for that matter.)
241            x)  68K emulation; think about how to do variable instruction
242                lengths across page boundaries.
243            x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,
244                it would be reasonably simple to add; in each individual fast
245                load/store routine = a lot more work, and it would become
246                kludgy very fast.)
247            x)  Dyntrans with SMP... lots of work to be done here.
248            x)  Dyntrans with cache emulation... lots of work here as well.
249            x)  Remove the concept of base RAM completely; it would be more
250                generic to allow RAM devices to be used "anywhere".
251            o)  dev_mp doesn't work well with dyntrans yet
252            o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
253            x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,
254                    so that it caches a translation (that is, an instruction
255                    word and the instr_call it was translated to the last
256                    time), so that it doesn't need to do slow
257                    to_be_translated for each end of page?
258            x)  Program Counter statistics:
259                    Per machine? What about SMP? All data to the same file?
260                    A debugger command should be possible to use to enable/
261                    disable statistics gathering.
262                    Configuration file option!
263            x)  Breakpoints:
264                    o) Physical vs virtual addresses!
265                    o) 32-bit vs 64-bit sign extension for MIPS, and others?
266            x)  INVALIDATION should cause translations in _all_ cpus to be
267                invalidated, e.g. on a write to a write-protected page
268                (containing code)
269            x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
270            x)  Lots of other stuff: see src/cpus/README_DYNTRANS
271            x)  Native code generation backends:
272                    o)  calculate at runtime whether or not chunks of emulated
273                        (physical) memory are worth translating to native code
274                        (it is assumed that it has high overhead)
275                    o)  experiment with calling the host's cc and ld externally;
276                        extremely high overhead, but could be interesting none-
277                        theless.
278                    o)  experiment with using LLVM, or GNU Lightning?
279                    o)  Important cases to think about:
280                            x)  loads/stores
281                            x)  delay branches
282                            x)  other kinds of calls, branches
283                    o)  branches to already translated code blocks can
284                        link the blocks together (block-chaining), although
285                        I'll probably want to wait with this until other
286                        things work.
287                    o)  The first tests should be done with "testm88k", because
288                        that does not affect other modes.
289    
290    -------------------------------------------------------------------------------
291    
292    Performance comparison when emulating the QEMU_MIPS machine (QEMU's default
293    MIPS machine mode):
294    
295    mips-test-0.2:
296    --------------
297    
298    1. while true; do ls -l > /dev/null; echo -n .; done, 80x36 dots
299    2. while true; do /usr/bin/md5sum /usr/bin/* > /dev/null; echo -n .; done, 80 dots
300    3. while true; do grep hej lib/libc.so.6  > /dev/null; echo -n .; done, 80 dots
301    
302                            Test 1          Test 2          Test 3
303                            ------          ------          ------
304    QEMU 0.9.0:             2 min 20 sec    45 sec          4 min 41 seconds
305    GXemul-20070608:        1 min 59 sec    3 min 18 sec    18 min 10 seconds  [A]
306    
307    
308    [A] = Normal portable dyntrans, no native code generation.
309    
310    -------------------------------------------------------------------------------
311    
312    
313    Simple Valgrind-like checks?
314            o)  Mark every address with bits which tell whether or not the address
315                has been written to.
316            o)  What should happen when programs are loaded?  Text/data, bss (zero
317                filled). But stack space and heap is uninitialized.
318            o)  Uninitialized local variables:
319                    A load from a place on the stack which has not previously
320                    been stored to => warning. Increasing the stack pointer using
321                    any available means should reset the memory to uninitialized.
322            o)  If calls to malloc() and free() can be intercepted:
323                    o)  Access to a memory area after free() => warning.
324                    o)  Memory returned by malloc() is marked as not-initialized.
325                    o)  Non-passive, but good to have: Change the argument
326                        given to malloc, to return a slightly larger memory
327                        area, i.e.  margin_before + size + margin_after,
328                        and return the pointer  + margin_before.
329                        Any access to the margin_before or _after space results
330                        in warnings. (free() must be modified to free the
331                        actually allocated address.)
332    
333  Better CD Image file support:  Better CD Image file support:
334          x)  Support CD formats that contain more than 1 track, e.g.          x)  Support CD formats that contain more than 1 track, e.g.
335              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 325  Better CD Image file support: Line 339  Better CD Image file support:
339              possibly other live-CD formats.)              possibly other live-CD formats.)
340    
341  Networking:  Networking:
342            x)  Redesign of the networking subsystem, at least the NAT translation
343                    part. The current way of allowing raw ethernet frames to be
344                    transfered to/from the emulator via UDP should probably be
345                    extended to allow the frames to be transmitted other ways as
346                    well.
347            x)  Also adding support for connecting ttys (either to xterms, or to
348                    pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
349            x)  Documentation updates (!) are very important, making it easier to
350                    use the (already existing) network emulation features.
351          x)  Fix performance problems caused by only allowing a          x)  Fix performance problems caused by only allowing a
352              single TCP packet to be unacked.              single TCP packet to be unacked.
353          x)  Don't hardcode offsets into packets!          x)  Don't hardcode offsets into packets!
# Line 357  Cache simulation: Line 380  Cache simulation:
380              is another option (easier to implement, but very very slow).              is another option (easier to implement, but very very slow).
381    
382  Documentation:  Documentation:
383            x)  Update the documentation regarding the testmachine interrupts.
384          x)  Note about sandboxing/security:          x)  Note about sandboxing/security:
385                  Not all emulated instructions fail in the way they would                  Not all emulated instructions fail in the way they would
386                  do on real hardware (e.g. a userspace program writing to                  do on real hardware (e.g. a userspace program writing to
# Line 390  Documentation: Line 414  Documentation:
414              that use 3MAX into using CATS or hpcmips? (To remove the need              that use 3MAX into using CATS or hpcmips? (To remove the need
415              to use a raw ffs partition, using up all of the disk image.)              to use a raw ffs partition, using up all of the disk image.)
416    
 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.)  
   
417  The Device subsystem:  The Device subsystem:
418          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
419              minimum size, etc, or up to a max size); if there is a collision,              minimum size, etc, or up to a max size); if there is a collision,
# Line 412  The Device subsystem: Line 428  The Device subsystem:
428          x)  refactor various clocks/nvram/cmos into one device?          x)  refactor various clocks/nvram/cmos into one device?
429    
430  PCI:  PCI:
431            x)  Pretty much everything related to runtime configuration, device
432                slots, interrupts, etc must be redesigned/cleaned up. The current
433                code is very hardcoded and ugly.
434            o)  Allow cards to be added/removed during runtime more easily.
435            o)  Allow cards to be enabled/disabled (i/o ports, etc, like
436                NetBSD needs for disk controller detection).
437            o)  Allow devices to be moved in memory during runtime.
438            o)  Interrupts per PCI slot, etc. (A-D).
439            o)  PCI interrupt controller logic... very hard to get right,
440                because these differ a lot from one machine to the next.
441          x)  last write was ffffffff ==> fix this, it should be used          x)  last write was ffffffff ==> fix this, it should be used
442              together with a mask to get the correct bits. also, not ALL              together with a mask to get the correct bits. also, not ALL
443              bits are size bits! (lowest 4 vs lowest 2?)              bits are size bits! (lowest 4 vs lowest 2?)
# Line 419  PCI: Line 445  PCI:
445          x)  generalize the interrupt routing stuff (lines etc)          x)  generalize the interrupt routing stuff (lines etc)
446    
447  Clocks and timers:  Clocks and timers:
448            x)  Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)
449          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
450          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
451          x)  NetWinder timeofday is incorrect!              NetBSD sources; it doesn't seem to be initialized _AT ALL_?!
452          x)  Cobalt TOD is incorrect!          x)  Cobalt TOD is incorrect!
453          x)  Go through all other machines, one by one, and fix them.          x)  Go through all other machines, one by one, and fix them.
454    
# Line 440  Floating point layer: Line 467  Floating point layer:
467          o)  non-IEEE modes (i.e. x86)?          o)  non-IEEE modes (i.e. x86)?
468    
469  Userland emulation:  Userland emulation:
470          x)  Lots of stuff; freebsd and netbsd (and linux?) syscalls.          x)  Try to prefix "/emul/mips/" or similar to all filenames,
471          x)  Dynamic linking? Hm.              and only if that fails, try the given filename.
472                Read this setting from an environment variable, and only
473                if there is none, fall back to hardcoded string.
474            x)  File descriptor (0,1,2) assumptions? Find and fix these?
475            x)  Dynamic linking!
476            x)  Lots of stuff; freebsd, netbsd, linux, ... syscalls.
477            x)  Initial register/stack contents (environment, command line args).
478            x)  Return value (from main).
479            x)  mmap emulation layer
480            x)  errno emulation layer
481            x)  struct conversions for many syscalls
482    
483  Sound:  Sound:
484          x)  generic sound framework          x)  generic sound framework
# Line 513  Better framebuffer and X-windows functio Line 550  Better framebuffer and X-windows functio
550          o)  Generalize the framebuffer stuff by moving _ALL_ X11          o)  Generalize the framebuffer stuff by moving _ALL_ X11
551                  specific code to src/x11.c!                  specific code to src/x11.c!
552    
553    -------------------------------------------------------------------------------
554    
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