** Changed in: qemu
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1128935
Title:
MIPS r4k "TLB modified exception" generated for TLB entries that are
not visible
A shorter command line to reproduce this with QEMU 2.11.0 and HelenOS
0.7.1 would be:
$ qemu-system-mips -cpu 4Kc -kernel HelenOS-0.7.1-mips32-malta-be.boot
-nographic
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Yes, running the following command line with QEMU 2.11.0 on the HelenOS
0.7.1 image downloaded from
http://www.helenos.org/releases/HelenOS-0.7.1-mips32-malta-be.boot will
result in occasional "failures" of the TLBP instruction as described in
this bug and as evidenced by a warning printed by Helen
Triaging old bug tickets... can you still reproduce this issue with the
latest version of QEMU? Or could we close this ticket nowadays?
** Changed in: qemu
Status: New => Incomplete
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Linux under QEMU does not hit this issue because it turns out that its
"TLB modified" handler does not check the P bit of the Index register
after the TLBP instruction.
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** Summary changed:
- MIPS r4k TLB modified exception generated for TLB entries not visible to the
TLBP instruction
+ MIPS r4k "TLB modified exception" generated for TLB entries that are not
visible to the TLBP instruction
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