/[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 32 by dpavlin, Mon Oct 8 16:20:58 2007 UTC revision 42 by dpavlin, Mon Oct 8 16:22:32 2007 UTC
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1  $Id: TODO,v 1.410 2006/11/06 05:32:38 debug Exp $  $Id: TODO,v 1.536 2007/06/15 22:30:17 debug Exp $
2    
3  This file is my list of things I want to work on in the future. It is in  Some things, in no specific order, that I'd like to fix:
4  random order, and some parts of it are probably out-to-date by now.  (Some items in this list are perhaps already fixed.)
5    
6    M88K:
7  Dyntrans:          o)  Neither NIP nor FIP valid in rte?
8          x)  Instruction combination collisions? How to avoid easily...          o)  FIP != NIP + 4, in rte! (Simulate delayed branch stuff.)
9          x)  Think about how to do both SHmedia and SHcompact in a reasonable          o)  cpu_dyntrans.c: MEMORY_USER_ACCESS implementation for M88K!
10              way! (Or AMD64 long/protected/real, for that matter.)          o)  xmem: Set transaction registers!
11          x)  68K emulation; think about how to do variable instruction          o)  CMMUs:
12              lengths across page boundaries.                  o)  Translation invalidations, could be optimized.
13          x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,                  o)  Move initialization from dev_mvme187 to somewhere
14              it would be reasonably simple to add; in each individual fast                      more reasonable?
15              load/store routine = a lot more work, and it would become          o)  Instruction trace by using bits of ??IP control regs.
16              kludgy very fast.)          o)  Interrupts (these are machine dependent, though).
17          x)  Dyntrans with SMP... lots of work to be done here.          o)  Implement devices etc. for one or more machine modes,
18          x)  Dyntrans with cache emulation... lots of work here as well.              to get some guest OS running. OpenBSD/mvme88k on MVME187
19          o)  dev_mp doesn't work well with dyntrans yet              seems to be the smartest path to follow for now.
20          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans                  o)  VME bus device
21          x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,                  o)  PCC2
22                  so that it caches a translation (that is, an instruction                  o)  Cirrus Logic serial port controller
23                  word and the instr_call it was translated to the last          o)  Instruction disassembly, and implementation:
24                  time), so that it doesn't need to do slow                  o)  See http://www.panggih.staff.ugm.ac.id/download/GCC/info/gcc.i5
25                  to_be_translated for each end of page?                      for some strange cases of when "div" can fail (?)
26          x)  Program Counter statistics:                  o)  Floating point stuff
27                  Per machine? What about SMP? All data to the same file?                  o)  "Graphics" instructions (M88110-specific)
                 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,  
             experiment in a separate project (not in GXemul)  
                 o) First test would be to just implement a simple  
                    instruction such as MIPS' addiu or lui, on AMD64  
                    hosts...  
   
 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 72  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
55                            /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */
56                        in cpu_mips.c is not correct for R10000 according to
57                        Lemote's Godson patches for GXemul. TODO: Go through all
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
59                        and make sure everything works with R10000.
60                        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)  DMA (0xffa00000)          x)  Auto-generation of loads/stores! This should get rid of at least
68          x)  Instruction tracing should include symbols for branch targets,              the endianness check in each load/store.
69              and so on...          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)
74            x)  SH4 UBC (0xff200000)
75            x)  Store queues can copy 32 bytes at a time, there's no need to
76                copy individual 32-bit words. (Performance improvement.)
77          x)  SH4 BSC (Bus State Controller)          x)  SH4 BSC (Bus State Controller)
78          x)  NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?          x)  Instruction tracing should include symbols for branch targets,
79          x)  Replace pc-relative loads with immediate load, if within the              and so on, to make the output more human readable.
80              same page. (Similar to the same optimization for ARM.)          x)  SH3-specific devices: Pretty much everything!
81          x)  Floating point exception correctness.          x)  NetBSD/evbsh3, hpcsh! Linux?
82          x)  Floating point speed!          x)  Floating point speed!
83            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)  CD image bootup:          x)  G2 DMA
97                  0)  Find IP.BIN, and load it to 0x8c008000.          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
                 1)  Run code at 0x8c008300 (SEGA license code).  
                 2)  When the license code runs a "boot menu" syscall,  
                     load the 1ST_READ.BIN file (unscrambled?) to 0x8c010000.  
                 3)  Run code at 0x8c00b800 (Bootstrap 1). This will in turn  
                     jump to 0x8c00e000 (Bootstrap 2), and then jump to  
                     0x8c010000, to start the program.  
                 (Try with e.g. Comstedt's Serial IP Slave, to make sure it  
                 works as expected.)  
         x)  LAN adapter.  
98          x)  PVR:  Lots of stuff. See dev_pvr.c.          x)  PVR:  Lots of stuff. See dev_pvr.c.
99            x)  Better GDROM support
100            x)  Modem
101            x)  PCI bridge/bus?
102          x)  Maple bus:          x)  Maple bus:
103                  x)  Correct controller input                  x)  Correct controller input
104                  x)  Mouse input                  x)  Mouse input
105          x)  PROM/BIOS calls:          x)  Software emulation of BIOS calls:
106                  x)  GD-ROM emulation                  x)  GD-ROM emulation: Use the GDROM device.
107          x)  NetBSD/dreamcast: Root on nfs?                  x)  Use the VGA font as a fake ROM font. (Better than
108          x)  Linux/dreamcast? (The gentoo kernel currently crashes.)                      nothing.)
109            x)  Make as many as possible of the KOS examples run!
110          x)  More homebrew demos/games.          x)  More homebrew demos/games.
111          x)  Sound emulation (ARM cpu).          x)  SPU: Sound emulation (ARM cpu).
112          x)  VME processor emulation?          x)  VME processor emulation? "(Sanyo LC8670 "Potato")" according to
113                Wikipedia, LC86K87 according to Comstedt's page. See
114  Transputer:              http://www.maushammer.com/vmu.html for a good description of
115          x)  Implement support for Helios binaries.              the differences between LC86104C and the one used in the VME.
         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.  
116    
117  Alpha:  Alpha:
118          x)  OSF1 PALcode, Virtual memory support.          x)  OSF1 PALcode, Virtual memory support.
# Line 168  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)  Save/restore register windows etc!          o)  Exception/trap/interrupt handling.
129            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)  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)  find and fix the bug which causes NetBSD/macppc to fail after          x)  Fix DECR timer speed, so it matches the host.
             an install!  
140          x)  NetBSD/prep 3.x triggers a possible bug in the emulator:          x)  NetBSD/prep 3.x triggers a possible bug in the emulator:
141              <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>              <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
142                <ata_get_xfer(0,0xd60cdd30,0,8,..)>                <ata_get_xfer(0,0xd60cdd30,0,8,..)>
# Line 221  POWER/PowerPC: Line 160  POWER/PowerPC:
160          x)  Floating point exception correctness.          x)  Floating point exception correctness.
161          x)  Alignment exceptions.          x)  Alignment exceptions.
162    
163    PReP:
164            x)  Clock time! ("Bad battery blah blah")
165    
166  Algor:  Algor:
167          o)  Other models than the P5064?          o)  Other models than the P5064?
168          o)  PCI interrupts... needed for stuff like the tlp NIC?          o)  PCI interrupts... needed for stuff like the tlp NIC?
169    
170    BeBox:
171            o)  Interrupts. There seems to be a problem with WDC interrupts
172                "after a short while", although a few interrupts get through?
173            o)  Perhaps find a copy of BeOS and try it?
174    
175  HPCmips:  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.  
   
 AVR32:  
         o)  Everything. It would be good if there was NetBSD/avr32 to  
             experiment with...  
   
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 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!
186          o)  zaurus for openbsd...          o)  Debian/cats crashes because of unimplemented coproc stuff.
         o)  debian/cats crashes because of unimplemented coproc stuff.  
187              fix this?              fix this?
188    
189  Test machines:  Test machines:
190          + dev_fb block fill and copy          o)  dev_fb block fill and copy
191          + dev_fb draw characters (from the built-in font)?          o)  dev_fb draw characters (from the built-in font)?
192          + dev_fb input device? mouse pointer coordinates and buttons          o)  dev_fb input device? mouse pointer coordinates and buttons
193                  (allow changes in these to cause interrupts as well?)                  (allow changes in these to cause interrupts as well?)
194          + Redefine the halt() function so that it stops "sometimes          o)  Redefine the halt() function so that it stops "sometimes
195            soon", i.e. usage in demo code should be:              soon", i.e. usage in demo code should be:
196                  for (;;) {                  for (;;) {
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 267  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 299  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 308  Documentation: Line 390  Documentation:
390                  securely".                  securely".
391          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!)
392          x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!          x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!
393          x)  DEVICE_TICK in technical.html          x)  BETTER DEVICE EXAMPLES!
394                    o)  Move away from technical.html to somewhere new.
395                    o)  DEVICE_TICK
396                    o)  Implement example devices using interrupts, dyntrans
397                        memory access, etc.?
398            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 327  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 349  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 356  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    
 Busses:  
         o)  Redesign the entire "mainbus" concept!  
                 x)  Busses should be placed in a hierarchical tree (?)  
                 x)  Specific clock/bus speeds, cpu speeds etc.  
         o)  Interrupt routing subsystem:  
                 x)  IF POSSIBLE, try to make the new system work with the  
                     current system, but print annoying warning messages. :)  
                     Think carefully about this.  
                 x)  Registry for all available interrupts.  
                         +)  Each interrupt controller (including CPU cores  
                             that can handle interrupts) should register its  
                             interrupts, e.g.  
                                 cpu[0].irq[3]  
                                 cpu[0].irq[3].pcmcia_slot[1]  
                                 cpu[0].irq.pci[3]  
                         +)  Note: MIPS cpus have multiple irqs in the core,  
                             while some other CPUs only have one (irq[0]  
                             or just irq).  
                 x)  Users should use interrupt _names_ instead of integers  
                     when attaching to an interrupt controller, but when  
                     asserting/deasserting irq lines, small integers must  
                     still be used (for obvious performance reasons).  
                     Figure out a way to do this nicely!  
                 x)  Any users need to say whether they need the interrupt line  
                     exclusively or allow shared access.  
                 x)  Must work with everything from native IRQs to  
                     TurboChannel/PCI/ISA/ADB/PCMCIA/...  
                 x)  Must work with SMP emulation!  
                 x)  Make it with device_add(). How does the end user find  
                     out the name of an interrupt controller/line in e.g.  
                     a configuration file?  
         o)  Synchronization over network? or at least in dyntrans within  
             one emulated machine  
         o)  Convert to real busses: TurboChannel, PCMCIA, ADB  
   
455  Config file parser:  Config file parser:
456          o)  Rewrite it from scratch!          o)  Rewrite it from scratch!
457          o)  Usage of any expression available through the debugger          o)  Usage of any expression available through the debugger
458            o)  Allow interrupt controllers to be added! and interrupts
459                to be used in more ways than before
460          o)  Support for running debugger commands (like the -c          o)  Support for running debugger commands (like the -c
461              command line option)              command line option)
462    
# Line 410  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
485          x)  add one or more sound cards as devices; add a testmachine          x)  add one or more sound cards as devices; add a testmachine
486              sound card first?              sound card first?
487            x)  Dreamcast sound? Generic PCI sound cards?
488    
489  ASC SCSI controller:  ASC SCSI controller:
490          x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul          x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul
# Line 442  Caches / memory hierarchies: (this is mo Line 510  Caches / memory hierarchies: (this is mo
510              possible.              possible.
511    
512  File/disk/symbol handling:  File/disk/symbol handling:
513            o)  Make sure that disks can be added/removed during runtime!
514                (Perhaps this needs a reasonably large re-write.)
515          o)  Remove some of the complexity in file format guessing, for          o)  Remove some of the complexity in file format guessing, for
516                  Ultrix kernels that are actually disk images?                  Ultrix kernels that are actually disk images?
517          o)  Better handling of tape files          o)  Better handling of tape files      
518          o)  Read function argument count and types from binaries? (ELF?)          o)  Read function argument count and types from binaries? (ELF?)
519          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.
520              Microsoft's C++, so multiple schemes must be possible. See              Microsoft's C++, so multiple schemes must be possible. See
# Line 453  File/disk/symbol handling: Line 523  File/disk/symbol handling:
523  Userland ABI emulation:  Userland ABI emulation:
524          o)  see src/useremul.c          o)  see src/useremul.c
525    
 Terminal/console:  
         o)  allow emulated serial ports to be connected to the outside  
             world in a more generic way, or even to other emulated  
             machines(?)  
   
 Save state of the whole emulated machine, to be able to load it back  
         in later?  (Memory, all device's states, all registers and  
         so on.  Like taking a snapshot. (SimOS seems to do this,  
         according to its website.))  
   
526  Better framebuffer and X-windows functionality:  Better framebuffer and X-windows functionality:
527          o)  Generalize the update_x1y1x2y2 stuff to an extend-region()          o)  Generalize the update_x1y1x2y2 stuff to an extend-region()
528              function...              function...
# Line 490  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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