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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-07 17:23:11 +0000 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-07 17:23:11 +0000 |
| commit | c50b0c4da17b6e83640e4ed2380fffb5f507c846 (patch) | |
| tree | b4f203fce1380e2ea3578a784bb8ee060fe42cbd /results/classifier/zero-shot-user-mode/output/instruction/1828867 | |
| parent | 61361f925d4914a6608a0076e64cc2399311ed5f (diff) | |
| download | emulator-bug-study-c50b0c4da17b6e83640e4ed2380fffb5f507c846.tar.gz emulator-bug-study-c50b0c4da17b6e83640e4ed2380fffb5f507c846.zip | |
add zero-shot results
Diffstat (limited to 'results/classifier/zero-shot-user-mode/output/instruction/1828867')
| -rw-r--r-- | results/classifier/zero-shot-user-mode/output/instruction/1828867 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/results/classifier/zero-shot-user-mode/output/instruction/1828867 b/results/classifier/zero-shot-user-mode/output/instruction/1828867 new file mode 100644 index 00000000..4d25c0d7 --- /dev/null +++ b/results/classifier/zero-shot-user-mode/output/instruction/1828867 @@ -0,0 +1,14 @@ +instruction: 0.915 +runtime: 0.048 +syscall: 0.037 + + + +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" \ No newline at end of file |