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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/semantic-bugs/instruction/1828867
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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-instruction: 0.527
-device: 0.454
-socket: 0.435
-mistranslation: 0.388
-assembly: 0.285
-network: 0.264
-vnc: 0.258
-graphic: 0.231
-semantic: 0.225
-boot: 0.171
-other: 0.169
-KVM: 0.124
-
-QEmu translation is incorrect when using REX in combination with LAHF/SAHF
-
-When translating code that is using LAHF and SAHF in combination with the REX prefix then qemu translates incorrectly.
-These two instructions only ever use the AH register. Contrary to other instructions where if you use REX + high bit offsets then it'll pull in rsp and a few other registers.
-On hardware the REX prefix doesn't effect behaviour of these instructions at all.
-QEMU incorrectly selects RSP as the register of choice here due to this combination of REX + AH register usage.
-
-I've attached a patch that is super terrible just so I can work around the issue locally and to sort of show off how it is to be "fixed"
-
-
-
-Here's also a basic test that can be run on hardware and have rflags and rsp inspected after each instruction just to see how hardware doesn't effect it.
-
-The QEMU project is currently considering to move its bug tracking to
-another system. For this we need to know which bugs are still valid
-and which could be closed already. Thus we are setting older bugs to
-"Incomplete" now.
-
-If you still think this bug report here is valid, then please switch
-the state back to "New" within the next 60 days, otherwise this report
-will be marked as "Expired". Or please mark it as "Fix Released" if
-the problem has been solved with a newer version of QEMU already.
-
-Thank you and sorry for the inconvenience.
-
-This is still relevant.
-
-
-This is an automated cleanup. This bug report has been moved to QEMU's
-new bug tracker on gitlab.com and thus gets marked as 'expired' now.
-Please continue with the discussion here:
-
- https://gitlab.com/qemu-project/qemu/-/issues/130
-
-