/[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!
ViewVC logotype

Diff of /trunk/TODO

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 30 by dpavlin, Mon Oct 8 16:20:40 2007 UTC revision 44 by dpavlin, Mon Oct 8 16:22:56 2007 UTC
# Line 1  Line 1 
1  $Id: TODO,v 1.343 2006/08/14 18:46:30 debug Exp $  $Id: TODO,v 1.556 2007/09/11 21:46:35 debug Exp $
2    
3  Hm. This file is in random order, and not all parts of it are up-to-date.  Some things, in no specific order, that I'd like to fix:
4    (Some items in this list are perhaps already fixed.)
5    
6    -------------------------------------------------------------------------------
7    
8  Implementation:  A first pass of installation regression testing of NetBSD 4.0 RC1 in GXemul:
         x)  ARM "wait"-like instruction.  
         x)  CLOCK FRAMEWORK!  
         x)  Mouse support for NetBSD/pmax 4.x!  
         x)  See netwinder_reset() in NetBSD; the current "an internal error  
             occured" message after reboot/halt is too ugly.  
         x)  64-bit ranges in src/cpus/memory_mips_v2p.c  
         x)  Revert the dyntrans page template experiment? Hm.  
         x)  Refactor the cpu type detection/initialization/listing.  
                 Macro, which can be used as long as the cpu definitions  
                 contain a 'name'?  
         x)  Testmachine includes:  
                 + dev_fb block fill and copy  
                 + dev_fb draw characters (from the built-in font)?  
                 + dev_fb input device? mouse pointer coordinates and buttons  
                         (allow changes in these to cause interrupts as well?)  
                 + Redefine the halt() function so that it stops "sometimes  
                   soon", i.e. usage in demo code should be:  
                         for (;;) {  
                                 halt();  
                         }  
         x)  Continue on SPARC emulation  
                 + Enable it in the configure script as soon as it can  
                   run all the demo programs.  
         x)  Continue on Alpha emulation  (virtual memory, etc). Cleanup.  
         x)  Nicer MIPS status bits in register dumps.  
         x)  Alignment exceptions (MIPS, PPC, ARM?, ...)  
         x)  Rewrite the networking stack; make OpenBSD work better as a guest  
             OS, fix the performance problems, make Linux work with DHCP, etc.  
             Support VDE (vde.sf.net)? Allow SLIP connections, possibly PPP,  
             in addition to ethernet?  
         x)  Implement more ethernet NICs.  
         x)  IOP (I2O) device?  
9    
10  Documentation:          X  pmax (including X Windows out-of-the-box)
11          x)  "Install netbsd/pmax first" => only use the install kernel?          X  arc  (1.6.2 -> 4.0! Yay!)
12          x)  Rewrite the section about experimental devices, after the             hpcmips
13              framebuffer acceleration has been implemented, and demos             cobalt
14              written. (Symbolic names instead of numbers; example             evbmips
15              use cases, etc. Mention demo files that use the various             algor
16              features?)             sgimips
17          x)  "a very simple linear framebuffer device (for graphics output)"             cats
18              under "which machines does gxemul emulate" ==> better             evbarm
19              description?             netwinder
20          x)  Better description on how to set up a cross compiler?             prep         nej, 2.0 är senaste som funkar :(
21              Example for MIPS64.          X  macppc
22               pmppc
23            X  dreamcast
24            X  landisk
25    
26  Long-term design:  X = done and worked fine
         x)  Instruction combination collisions? How to avoid easily...  
         x)  Think about how to do both SHmedia and SHcompact in a reasonable  
             way!  
         o)  Actually use the settings object, better debugger stuff, etc!  
         o)  Debugger command for enabling/disabling instruction statistics  
             during runtime.   machine.statistics = on|off  
         x)  MAINBUS REDESIGN!  
         x)  PCI redesign... I need to read up on how PCI actually works :)  
         x)  Clock framework! Go through all clock devices, make sure they  
             return correct data, and run at correct speeds!  
         x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,  
             it would be reasonably simple to add; in each individual fast  
             load/store routine = a lot more work, and it would become  
             kludgy very fast.)  
         x)  Dyntrans with SMP... lots of work to be done here.  
         x)  Dyntrans with cache emulation... lots of work here as well.  
         x)  Reimplement the config file parser from scratch.  
27    
28  -------------------------------------------------------------------------------  -------------------------------------------------------------------------------
29    
30  Simple Valgrind-like checks?  Perform a second regression test pass, when the actual NetBSD 4.0 release
31          o)  Mark every address with bits which tell whether or not the address  has happened.
             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.)  
32    
33  SMP:          o)  Test all guest OSes.
34          o)  dev_mp doesn't work well with dyntrans yet          o)  Update:
35          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans                  URLs
36                    Versions
37    
38            o)  Make a new GXemul release:  0.4.6.1
39    
40    -------------------------------------------------------------------------------
41    
42    M88K:
43            o)  FIP != NIP + 4, in rte! (Simulate delayed branch stuff.)
44            o)  cpu_dyntrans.c: MEMORY_USER_ACCESS implementation for M88K!
45            o)  xmem: Set transaction registers!
46            o)  CMMUs:
47                    o)  Translation invalidations, could be optimized.
48                    o)  Move initialization from dev_mvme187 to somewhere
49                        more reasonable?
50            o)  Instruction trace by using bits of ??IP control regs.
51            o)  Interrupts (these are machine dependent, though).
52            o)  Implement devices etc. for one or more machine modes,
53                to get some guest OS running. OpenBSD/mvme88k on MVME187
54                seems to be the smartest path to follow for now.
55                    o)  VME bus device
56                    o)  PCC2
57                    o)  Cirrus Logic serial port controller
58            o)  Instruction disassembly, and implementation:
59                    o)  See http://www.panggih.staff.ugm.ac.id/download/GCC/info/gcc.i5
60                        for some strange cases of when "div" can fail (?)
61                    o)  Floating point stuff
62                    o)  "Graphics" instructions (M88110-specific)
63    
64  MIPS:  MIPS:
65          +)  Some more work on opcodes.          o)  Nicer MIPS status bits in register dumps.
66                  x) The "wait" instruction. How to implement this functionality?          o)  Floating point exception correctness.
67                          (SMP, non-MIPS, interrupt correctness, host idling, ...)          o)  Fix this? Triggered by NetBSD/sgimips? Hm:
68                    to_be_translated(): TODO: unimplemented instruction:
69                    000000000065102c: 00200800 (d)  rot_00  at,zr,0
70            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,
75                                which have a rotation bit which differs from
76                                previous ISAs.
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.  
         o)  DROTR32 and similar MIPS64 rev 2 instructions, which have  
             a rotation bit which differs from previous ISAs.  
         o)  EI and DI instructions for MIPS64/32 rev 2. NOTE: These are  
             _NOT_ the same as for R5900!  
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
89                            /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */
90                        in cpu_mips.c is not correct for R10000 according to
91                        Lemote's Godson patches for GXemul. TODO: Go through all
92                        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
93                        and make sure everything works with R10000.
94                        Then test with OpenBSD/sgi?
95                    x)  Entry LO mask (as above).
96                  x)  memory space, exceptions, ...                  x)  memory space, exceptions, ...
97                  x)  use cop0 framemask for tlb lookups                  x)  use cop0 framemask for tlb lookups
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  Dyntrans:  SuperH:
101          x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,          x)  Auto-generation of loads/stores! This should get rid of at least
102                  so that it caches a translation (that is, an instruction              the endianness check in each load/store.
103                  word and the instr_call it was translated to the last          x)  Experiment with whether or not correct ITLB emulation is
104                  time), so that it doesn't need to do slow              actually needed. (20070522: I'm turning it off today.)
105                  to_be_translated for each end of page?          x)  SH4 interrupt controller:
106          x)  Program Counter statistics:                  x)  MASKING should be possible!
107                  Per machine? What about SMP? All data to the same file?          x)  SH4 DMA (0xffa00000)
108                  A debugger command should be possible to use to enable/          x)  SH4 UBC (0xff200000)
109                  disable statistics gathering.          x)  Store queues can copy 32 bytes at a time, there's no need to
110                  Configuration file option!              copy individual 32-bit words. (Performance improvement.)
111          x)  Common fatal_abort() function, which drops into the debugger          x)  SH4 BSC (Bus State Controller)
112                  without continuing.          x)  Instruction tracing should include symbols for branch targets,
113          x)  INVALIDATION should cause translations in _all_ cpus to be              and so on, to make the output more human readable.
114              invalidated, e.g. on a write to a write-protected page          x)  SH3-specific devices: Pretty much everything!
115              (containing code)          x)  NetBSD/evbsh3, hpcsh! Linux?
116          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)          x)  Floating point speed!
117          x)  Lots of other stuff: see src/cpus/README_DYNTRANS          x)  Floating point exception correctness.
118          x)  true recompilation backend? think carefully about this,          x)  Exceptions for unaligned load/stores. OpenBSD/landisk uses
119              experiment in a separate project (not in GXemul)              this mechanism for its reboot code (machine_reset).
120                  o) First test would be to just implement a simple  
121                     instruction such as MIPS' addiu or lui, on AMD64  Landisk SH4:
122                     hosts...          x)  When NetBSD/landisk 4.0 has been released, make sure it works
123          x)  Idle loop detection? (Depends on target.) Could be turned              in the emulator. (Update documentation, etc.)
124              into usleep(1) or similar on the host... except when doing              NetBSD HEAD (as of April 2007) hangs during bootup, because it
125              e.g. SMP emulation. Then it becomes trickier.              turns on/off interrupts in an unfortunately synchronized way
126                with dyntrans. This needs to be fixed.
127  Transputer:  
128          x)  Implement support for Helios binaries.  Dreamcast:
129          x)  Stack and register contents at startup?          x)  G2 DMA
130          x)  Figure out how to boot an entire Helios distribution.          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
131          x)  Implement all instructions. :)          x)  PVR:  Lots of stuff. See dev_pvr.c.
132            x)  Better GDROM support
133            x)  Modem
134            x)  PCI bridge/bus?
135            x)  Maple bus:
136                    x)  Correct controller input
137                    x)  Mouse input
138            x)  Software emulation of BIOS calls:
139                    x)  GD-ROM emulation: Use the GDROM device.
140                    x)  Use the VGA font as a fake ROM font. (Better than
141                        nothing.)
142            x)  Make as many as possible of the KOS examples run!
143            x)  More homebrew demos/games.
144            x)  SPU: Sound emulation (ARM cpu).
145            x)  VME processor emulation? "(Sanyo LC8670 "Potato")" according to
146                Wikipedia, LC86K87 according to Comstedt's page. See
147                http://www.maushammer.com/vmu.html for a good description of
148                the differences between LC86104C and the one used in the VME.
149    
150  Alpha:  Alpha:
151          o)  Virtual memory (tlbs etc)          x)  OSF1 PALcode, Virtual memory support.
152          o)  Get {NetBSD,OpenBSD,Linux}/alpha booting. :)          x)  PALcode replacement! PAL1E etc opcodes...?
153            x)  Interrupt/exception/trap handling.
154  SPARC:          x)  Floating point exception correctness.
155          o)  Load/stores to alternate address spaces!          x)  More work on bootup memory and register contents.
156          o)  Save/restore register windows etc!          x)  More Alpha machine types, so it could work with
157                OpenBSD, FreeBSD, and Linux too?
158    
159    SPARC (both the ISA and the machines):
160            o)  Implement Adress space identifiers; load/stores etc.
161            o)  Exception/trap/interrupt handling.
162            o)  Save/restore register windows etc! Both v9 and pre-v9!
163          o)  Finish the subcc and addcc flag computation code.          o)  Finish the subcc and addcc flag computation code.
164          o)  Add more registers (floating point, control regs etc)          o)  Add more registers (floating point, control regs etc)
165          o)  Disassemly of some more instructions?          o)  Disassemly of some more instructions?
166          o)  Are sll etc 32-bit sign-extending or zero-extending?          o)  Are sll etc 32-bit sign-extending or zero-extending?
167          o)  Finish the GDB register stuff.          o)  Floating point exception correctness.
168          o)  SPARC v8, v7 etc?          o)  SPARC v8, v7 etc?
169            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)  Generalize the expression evaluator. (debugger_expr.c?)  
                 settable variables      ("show nr of instructions on average")  
                 emul[x]                 defaults to current emul  
                 machine[x]              defaults to current machine  
                 cpu[x]                  defaults to currently focused cpu  
                 registers               cpu arch dependent (#-prefix)  
                 symbols                 @-prefix  
                 numeric constants       decimal, hex, and octal ($-prefix)  
                 boolean                 yes,no, true,false  
                 operators (+ - * / % & | ^ !)  
                 parentheses for grouping subexpressions  
                 NOTE: the change from % to # for register prefix!  
                 examples:  
                                 emul[0].machine[2].cpu[0].pc  
                                 machine[test2].cpu[1].ra = main  
                                 settings.show_trace_tree = yes  
   
                 Settings:  
                         o)  Remove a setting.  
                         o)  Read/write a setting given a name. (Read as  
                             string and/or int64_t simultaneously?)  
                         o)  Warnings when exiting the emulator, if the  
                             settings have not been removed exactly in  
                             the same way as they were added? This would  
                             improve code cleanliness in the long term.  
                             (I.e. require a corresponding _destroy()  
                             function for all _new functions... machine_  
                             cpu_ etc.)  
   
                 Help command should have subsections! One for "expressions",  
                 mirrored in the documentation, but the internal help should  
                 be the one that should be considered correct.  
         o)  see src/debugger.c for more  
170    
171  POWER/PowerPC:  POWER/PowerPC:
172            x)  Fix DECR timer speed, so it matches the host.
173            x)  NetBSD/prep 3.x triggers a possible bug in the emulator:
174                <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
175                  <ata_get_xfer(0,0xd60cdd30,0,8,..)>
176                    <0x26c550(&ata_xfer_pool,2,0,8,..)>
177                    <0x35c71c(0x3f27000,0,52,8,..)>
178                  <ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)>
179                    <atastart(0xd005e4c8,0x3f27000,0,13,..)>
180                      <__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)>
181                        <bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)>
182                    [ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ]
183                        <wdcwait(0xd005e4c8,72,64,0xbb8,..)>
184                          <0x198120(0xd005e4c8,72,64,0xbb8,..)>
185                            <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
186                            <delay(100,0,0,0xbb8,..)>
187                Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
188          x)  PPC optimizations; instr combs          x)  PPC optimizations; instr combs
189          x)  64-bit stuff: either Linux on G5, or perhaps some hobbyist          x)  64-bit stuff: either Linux on G5, or perhaps some hobbyist
190                  version of AIX? (if there exists such a thing)                  version of AIX? (if there exists such a thing)
         x)  find and fix the bug which causes NetBSD/macppc to fail after  
             an install!  
191          x)  macppc: adb controller; keyboard (for framebuffer mode)          x)  macppc: adb controller; keyboard (for framebuffer mode)
192          x)  make OpenBSD/macppc work (PCI controller stuff)          x)  make OpenBSD/macppc work (PCI controller stuff)
193            x)  Floating point exception correctness.
194            x)  Alignment exceptions.
195    
196    PReP:
197            x)  Clock time! ("Bad battery blah blah")
198    
199  Algor:  Algor:
200          PCI interrupts... needed or stuff like the tlp NIC?          o)  Other models than the P5064?
201            o)  PCI interrupts... needed for stuff like the tlp NIC?
202    
203    BeBox:
204            o)  Interrupts. There seems to be a problem with WDC interrupts
205                "after a short while", although a few interrupts get through?
206            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:
220            x)  Mouse/pad support! :)
221            x)  A NIC? (As a PCMCIA device?)
222    
223  ARM:  ARM:
224          o)  try to get netbsd/evbarm 3.x running (iq80321)          o)  See netwinder_reset() in NetBSD; the current "an internal error
225                occured" message after reboot/halt is too ugly.
226            o)  Generic ARM "wait"-like instruction?
227            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!
230          o)  zaurus for openbsd...          o)  Debian/cats crashes because of unimplemented coproc stuff.
         o)  debian/cats crashes because of unimplemented coproc stuff.  
231              fix this?              fix this?
232    
233    Test machines:
234            o)  dev_fb block fill and copy
235            o)  dev_fb draw characters (from the built-in font)?
236            o)  dev_fb input device? mouse pointer coordinates and buttons
237                    (allow changes in these to cause interrupts as well?)
238            o)  Redefine the halt() function so that it stops "sometimes
239                soon", i.e. usage in demo code should be:
240                    for (;;) {
241                            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:
340            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
342                and data tracks, and booting from an ISO filesystem path
343                would boot from [by default] the first data track.
344                (This would make sense for e.g. Dreamcast CD images, or
345                possibly other live-CD formats.)
346    
347    Networking:
348            x)  Redesign of the networking subsystem, at least the NAT translation
349                    part. The current way of allowing raw ethernet frames to be
350                    transfered to/from the emulator via UDP should probably be
351                    extended to allow the frames to be transmitted other ways as
352                    well.
353            x)  Also adding support for connecting ttys (either to xterms, or to
354                    pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
355            x)  Documentation updates (!) are very important, making it easier to
356                    use the (already existing) network emulation features.
357            x)  Fix performance problems caused by only allowing a
358                single TCP packet to be unacked.
359            x)  Don't hardcode offsets into packets!
360            x)  Test with lower than 100 max tcp/udp connections,
361                to make sure that reuse works!
362            x)  Make OpenBSD work better as a guest OS!
363            x)  DHCP? Debian doesn't actually send DHCP packets, even
364                    though it claims to? So it is hard to test.
365            x)  Multiple networks per emulation, and let different
366                NICs in machines connect to different networks.
367            x)  Support VDE (vde.sf.net)? Easiest/cleanest (before a
368                redesign of the network framework has been done) is
369                probably to connect it using the current (udp) solution.
370            x)  Allow SLIP connections, possibly PPP, in addition to
371                ethernet?
372    
373  Cache simulation:  Cache simulation:
374          o)  Command line flags for:          o)  Command line flags for:
375                  o)  CPU endianness?                  o)  CPU endianness?
# Line 242  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          o)  machines, cpus, devices.          x)  Update the documentation regarding the testmachine interrupts.
390          o)  Automagic documentation generation:          x)  Note about sandboxing/security:
391                  x)  REMEMBER that several machines/devices can be in                  Not all emulated instructions fail in the way they would
392                          the same source file!                  do on real hardware (e.g. a userspace program writing to
393          o)  Try to rewrite the install instructions for those machines                  a system register might work in GXemul, but it would
394              that use 3MAX into using CATS? (To remove the need to a raw                  fail on real hardware).  Sandbox = contain from the
395              ffs partition using up all of the disk image.)                  host OS. But the emulated programs will run "less
396                    securely".
397  More generic out_of_memory error reporting, and check everywhere!          x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)
398          Causes: OpenBSD has low default limits for normal users.          x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!
399                  Host is 32-bit? (32-bit hosts are limited to 4 GB or less          x)  Rewrite the section about experimental devices, after the
400                  of userspace memory.)              framebuffer acceleration has been implemented, and demos
401                  You are actually low on RAM. (As trivial as this might sound,              written. (Symbolic names instead of numbers; example
402                  Unix systems usually allow processes to allocate virtual              use cases, etc. Mention demo files that use the various
403                  memory beyond the amount of RAM in the machine.)              features?)
404            x)  "a very simple linear framebuffer device (for graphics output)"
405  Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc.              under "which machines does gxemul emulate" ==> better
406          Use the debugger's symbolic name stuff. (which will have to be              description?
         extended soon to support stuff like  "2*x + symbol + y" etc. cool  
         stuff)  
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
410              minimum size, etc, or up to a max size)              minimum size, etc, or up to a max size); if there is a collision,
411          x)  keep track of interrupts and busses? actually, allowing any device              return false. It is up to the caller to handle this situation!
412              to be a bus might be a nice idea.          x)  NOTE: Translations must be invalidated, both for
413          x)  turn interrupt controllers into devices? :-)              registering new devices, and for moving existing ones.
414          x)  refactor various clocks/nvram/cmos into one device?              cpu->invalidate translation caches, for all CPUs that
415                are connected to a specific memory.
 Clocks:  
         x)  General framework for automagic clock adjustment for _all_  
             kinds of clocks and timers. (Which should be possible to turn  
             off, of course, like the way DECstation emulation works now.)  
416    
417  PCI:  PCI:
418            x)  Pretty much everything related to runtime configuration, device
419                slots, interrupts, etc must be redesigned/cleaned up. The current
420                code is very hardcoded and ugly.
421            o)  Allow cards to be added/removed during runtime more easily.
422            o)  Allow cards to be enabled/disabled (i/o ports, etc, like
423                NetBSD needs for disk controller detection).
424            o)  Allow devices to be moved in memory during runtime.
425            o)  Interrupts per PCI slot, etc. (A-D).
426            o)  PCI interrupt controller logic... very hard to get right,
427                because these differ a lot from one machine to the next.
428          x)  last write was ffffffff ==> fix this, it should be used          x)  last write was ffffffff ==> fix this, it should be used
429              together with a mask to get the correct bits. also, not ALL              together with a mask to get the correct bits. also, not ALL
430              bits are size bits! (lowest 4 vs lowest 2?)              bits are size bits! (lowest 4 vs lowest 2?)
431          x)  add support for address fixups          x)  add support for address fixups
432          x)  generalize the interrupt routing stuff (lines etc). this should          x)  generalize the interrupt routing stuff (lines etc)
             be per machine? or per bus, that's better  
         x)  add a "pcn" NIC (AMD PCnet32 Lance 79c970 (PCI 1022:2000)),  
             could be useful for several machine modes (Malta, Algor, evbarm,  
             hp700?, macppc, etc.)  
   
 Network layer:  
         o)  DHCP (for Debian and BSD installers :-)  
         o)  increase performance  
         o)  don't rely on NetBSD-ish usage  
         o)  Multiple networks per emulation, and let different  
             NICs in machines connect to different networks.  
         o)  many other issues: see src/net.c  
433    
434  Busses:  Clocks and timers:
435          o)  Redesign the entire "mainbus" concept!          x)  Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)
436          o)  Busses should be placed in a hierarchical tree!          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
437          o)  Easily configurable interrupt routing in SMP systems.          x)  NetWinder timeofday is incorrect! Huh? grep -R for ta_rtc_read in
438          o)  Specific clock/bus speeds, cpu speeds etc.              NetBSD sources; it doesn't seem to be initialized _AT ALL_?!
439          o)  Synchronization over network? or at least in dyntrans within          x)  Cobalt TOD is incorrect!
440              one emulated machine          x)  Go through all other machines, one by one, and fix them.
         o)  dev->bus: TurboChannel, PCMCIA, ADB?  
441    
442  Config file parser:  Config file parser:
443          o)  Rewrite it from scratch!          o)  Rewrite it from scratch!
444          o)  Usage of any expression available through the debugger          o)  Usage of any expression available through the debugger
445            o)  Allow interrupt controllers to be added! and interrupts
446                to be used in more ways than before
447          o)  Support for running debugger commands (like the -c          o)  Support for running debugger commands (like the -c
448              command line option)              command line option)
449    
450  Floating point layer:  Floating point layer:
451          o)  make it common enough to be used by _all_ emulation modes          o)  make it common enough to be used by _all_ emulation modes
452          o)  implement more stuff          o)  implement correct error/exception handling and rounding modes
453            o)  implement more helper functions (i.e. add, sub, mul...)
454          o)  non-IEEE modes (i.e. x86)?          o)  non-IEEE modes (i.e. x86)?
455    
456  Userland emulation:  Userland emulation:
457          x)  Lots of stuff; freebsd and netbsd (and linux?) syscalls.          x)  Try to prefix "/emul/mips/" or similar to all filenames,
458          x)  Dynamic linking? Hm.              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!
463            x)  Lots of stuff; freebsd, netbsd, linux, ... syscalls.
464            x)  Initial register/stack contents (environment, command line args).
465            x)  Return value (from main).
466            x)  mmap emulation layer
467            x)  errno emulation layer
468            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
473          x)  add one or more sound cards as devices          x)  add one or more sound cards as devices; add a testmachine
474                sound card first?
475            x)  Dreamcast sound? Generic PCI sound cards?
476    
477  ASC SCSI controller:  ASC SCSI controller:
478          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
479              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
480              in NetBSD itself, http://mail-index.netbsd.org/source-changes/              in NetBSD itself, http://mail-index.netbsd.org/source-changes/
481              2005/11/06/0024.html suggests that.)              2005/11/06/0024.html suggests that.)
482                NetBSD 4.x seems to work? :)
483    
484  Caches / memory hierarchies: (this is mostly MIPS-specific)  Caches / memory hierarchies: (this is mostly MIPS-specific)
485          o)  src/memory*.c: Implement correct cache emulation for          o)  src/memory*.c: Implement correct cache emulation for
# Line 346  Caches / memory hierarchies: (this is mo Line 498  Caches / memory hierarchies: (this is mo
498              possible.              possible.
499    
500  File/disk/symbol handling:  File/disk/symbol handling:
501            o)  Make sure that disks can be added/removed during runtime!
502                (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)  Better handling of tape files          o)  Remove temporary files (/tmp/gxemul.blahblah) if loading fails
506                for some reason (unrecognized file, etc).
507            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.
510              Microsoft's C++, so multiple schemes must be possible. See              Microsoft's C++, so multiple schemes must be possible. See
# Line 357  File/disk/symbol handling: Line 513  File/disk/symbol handling:
513  Userland ABI emulation:  Userland ABI emulation:
514          o)  see src/useremul.c          o)  see src/useremul.c
515    
 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.))  
   
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()
525                function...
526          o)  -Yx sometimes causes crashes.          o)  -Yx sometimes causes crashes.
527          o)  Simple device access to framebuffer_blockcopyfill() etc,          o)  Simple device access to framebuffer_blockcopyfill() etc,
528              and text output (using the built-in fonts), for dev_fb.              and text output (using the built-in fonts), for dev_fb.
# Line 378  Better framebuffer and X-windows functio Line 533  Better framebuffer and X-windows functio
533          o)  Non-resizable windows?  Or choose scaledown depending          o)  Non-resizable windows?  Or choose scaledown depending
534                  on size (and center the image, with a black border).                  on size (and center the image, with a black border).
535          o)  Different scaledown on different windows?          o)  Different scaledown on different windows?
536            o)  Non-integral scale-up? (E.g. 640x480 -> 1024x768)
537          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
538          o)  Bug reported by Elijah Rutschman on MacOS with weird          o)  Bug reported by Elijah Rutschman on MacOS with weird
539              keys (F5 = cursor down?).              keys (F5 = cursor down?).
# Line 389  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  Statistics:  (this could be interesting)  -------------------------------------------------------------------------------
         o)  Save to file and show graphics. It should be possible to  
             run gxemul after a simulation to just show the graphics,  
             or convert to a .ppm or .tga or similar.  
         o)  memory accesses (to measure cache efficiency and  
                 page coloring efficiency)  
         o)  nr of simultaneous ASIDs in use in the TLB, for MIPS  
         o)  percentage of time spent in different "states", such as  
             running userland code, kernel code, or idling (for CPUs  
             that have such an instruction, or whenever the PC is  
             inside a specific idle-function (address range)).  
             Possible additional state (for example on R3000): caches  
             disabled.  
         o)  position of read/write on (SCSI) disks  
551    
Legend:
Removed from v.30  
changed lines
  Added in v.44
  ViewVC Help
Powered by ViewVC 1.1.26