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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:24:58 +0000 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:27:06 +0000 |
| commit | 33606b41d35115f887ea688b1a16f2ff85bf2fe4 (patch) | |
| tree | 406b2c7b19a087ba437c68f3dbf0b589fa1d6150 /results/scraper/launchpad-without-comments/1828867 | |
| parent | adedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff) | |
| download | qemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz qemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip | |
add launchpad bug reports without comments
Diffstat (limited to 'results/scraper/launchpad-without-comments/1828867')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1828867 | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1828867 b/results/scraper/launchpad-without-comments/1828867 new file mode 100644 index 000000000..eba02d8a5 --- /dev/null +++ b/results/scraper/launchpad-without-comments/1828867 @@ -0,0 +1,8 @@ +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 |