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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/1820686 | |
| parent | adedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff) | |
| download | emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip | |
add launchpad bug reports without comments
Diffstat (limited to 'results/scraper/launchpad-without-comments/1820686')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1820686 | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1820686 b/results/scraper/launchpad-without-comments/1820686 new file mode 100644 index 00000000..73859a9b --- /dev/null +++ b/results/scraper/launchpad-without-comments/1820686 @@ -0,0 +1,5 @@ +risc-v: 'c.unimp' instruction decoded as 'c.addi4spn fp, 0' + +QEMU 3.1 incorrectly decodes the "c.unimp" instruction (opcode 0x0000) as an "addi4spn fp, 0" when either of the two following bytes are non-zero. This is because the ctx->opcode value used when decoding the instruction is actually filled with a 32-bit load (to handle normal uncompressed instructions) but when a compressed instruction is found only the low 16 bits are valid. Other reserved/illegal bit patterns with the addi4spn opcode are also incorrectly decoded. + +I believe that the switch to decodetree on master happened to fix this issue, but hopefully it is helpful to have this recorded somewhere. I've included a simple one line patch if anyone wants to backport this. \ No newline at end of file |