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$Id: BUGS,v 1.33 2005/06/04 12:35:14 debug Exp $ |
KNOWN BUGS IN RELEASE 0.4.0 |
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Because the MIPS emulation mode has been completely rewritten, and I |
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haven't had much time to debug it, there are some known (serious) bugs: |
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Serious bugs: |
o) Performance for non-R3000 MIPS emulation is very poor. |
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x) An unknown math coprocessor bug. (Ultrix' dxclock sometimes looks |
o) Although the new MIPS emulation system is stable enough to |
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weird.) |
let many guest operating systems install, it is not stable |
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enough to let the emulator be compiled inside itself (in a |
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guest OS) after an install, in all emulation modes. |
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x) Enabling cache emulation (./configure --enable-caches) triggers bugs. |
o) Ultrix 4.5 on R3000 in the emulator has problems with keyboard |
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interrupts; Ultrix 4.2 works fine, though, and Ultrix 4.5 when |
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run with -C R4400. |
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x) Compiling with certain versions of gcc and -O3 optimization on i386 |
These problems will hopefully be corrected in future releases. |
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triggers bugs. I'm not sure whether they are in gcc or in GXemul. |
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x) Linux/DECstation (Debian) oopses extremely often unless -U is used |
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at run-time. I'm not sure yet why it bugs out. With -U, the risk is |
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lower, but not completely gone. _Maybe_ this is a bug in Linux. Why? |
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Because the oops message contains things like ANSI escape codes and |
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characters in registers (including the pc and return address register); |
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this looks like a buffer overflow in the serial driver. (Another thing |
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that gives weight to this theory is that the serial driver in Linux is |
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still being developed.) But this is just a guess. |
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x) bintrans bugs. (For example, NetBSD/sgimips for IP22/24 hangs during |
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boot with bintrans enabled.) |
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Less serious bugs / issues: |
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o) hardware device ticks are done at cycle specific intervals, not |
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instruction intervals, so sometimes a fraction of a cycle can be |
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"lost". |
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o) running Linux/DECstation 2.4.26 with no scsi disks attached causes |
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a warning message to be printed by Linux. |
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o) UDP packets that are too large are not handled well by the Lance device. |
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o) Colors in X11 framebuffers on MacOS X hosts are wrong. (I'm not sure |
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how to solve this; the code works on both little-endian (Alpha) and |
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big-endian (UltraSPARC) X-servers...) |
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o) bintranslated 64-bit stuff checks to see if the top 32 bits are |
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all zeroes or all ones, and then uses 32-bit tables and such. This |
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is a bug. It should check the top 33 bits, not 32. (Alpha only, already |
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fixed for i386?) |
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o) NetBSD/arc 2.0 uses the ASC controller in a way which GXemul cannot yet |
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handle. (NetBSD 1.6.2 works ok.) |
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