https://bugs.kde.org/show_bug.cgi?id=398545
Bug ID: 398545
Summary: Support for SHA instruction on Ryzen
Product: valgrind
Version: 3.14 SVN
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: ehoff...@videotron.ca
Target Milestone: ---
Setup:
Ryzen 2700X
Issue:
2 issues really.
The first one, the cpuid instruction does not return the sha instruction
extension bit set (CPUID leaf 7, subleaf 0, result EBX bit 29)
In fact, my CPU is returning, for cpuid leaf 7, subleaf 0 (while NOT in
Valgrind): EBX:0x209C01A9
And, while running in Valgrind: EBX:0x000027AB
So, the detection code does not detect the SHA instruction extension support.
Second, forcing the SHA instructions to be executed, Valgrind abort with:
vex amd64->IR: unhandled instruction bytes: 0xF 0x38 0xCB 0xCA 0xC5 0xF8 0x28
0xC1 0xC5 0xF8
vex amd64->IR: REX=0 REX.W=0 REX.R=0 REX.X=0 REX.B=0
vex amd64->IR: VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=0F38
vex amd64->IR: PFX.66=0 PFX.F2=0 PFX.F3=0
==32224== valgrind: Unrecognised instruction at address 0x11cdd3.
In this case, it's the SHA256RNDS2 instruction (0F 38 CB) that trigger the
abort
Regards,
Eric
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