SSE CMP ops with 8bit immediate throw sigill with oversized byte
Bug #1832422 reported by
FEX-Emu
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| QEMU |
Expired
|
Undecided
|
Unassigned | ||
Bug Description
The SSE comparison ops that use an 8bit immediate as a comparison type selector throws a sigill when the immediate is oversized.
Test op that I found this on is here `66 0f c2 c0 d1 cmppd xmm0,xmm0,0xd1`
According to the x86-64 documentation only bits [2:0] are used for these ops (and [4:0] for the AVX variant)
Currently qemu just checks if the value is >=8 and will throw a sigill in that case. It instead needs to mask.
I have a small patch that fixes the issue for the SSE variant.
Revision history for this message
| FEX-Emu (fex-emu) wrote | #1 |
Revision history for this message
| Thomas Huth (th-huth) wrote Moved bug report | #2 |
| Changed in qemu: | |
| assignee: | nobody → Paolo Bonzini (bonzini) |
| assignee: | Paolo Bonzini (bonzini) → nobody |
| status: | New → Expired |
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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.
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