Bug 375008

Summary:	amd64->IR: unhandled instruction bytes: 0x8F 0x6A 0x78 0x10 0xD8 0x4 0x4 0x0 0x0 0x8F
Product:	[Developer tools] valgrind	Reporter:	dcb314
Component:	vex	Assignee:	Julian Seward <jseward>
Status:	REPORTED ---
Severity:	normal	CC:	ivosh
Priority:	NOR
Version First Reported In:	3.13 SVN
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description dcb314 2017-01-13 14:44:27 UTC

Switch on -march=native in a gcc build on a AMD 8350, and I got this:

vex amd64->IR: unhandled instruction bytes: 0x8F 0x6A 0x78 0x10 0xD8 0x4 0x4 0x0 0x0 0x8F
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=NONE
vex amd64->IR:   PFX.66=0 PFX.F2=0 PFX.F3=0

$ ./valgrind/results/bin/valgrind --version
valgrind-3.13.0.SVN
$

Comment 1 Ivo Raisr 2017-05-05 16:11:52 UTC

Thank you for the report.
We need the unhandled instruction - can you obtain it for example by gdb or objdump?

Comment 2 dcb314 2017-05-05 17:07:19 UTC

Not sure what you are asking for.

I think the unhandled instruction is  0x8F 0x6A 0x78 0x10 0xD8 0x4 0x4 0x0 0x0 0x8F and so an arch reference manual (or wikipedia) will tell you which
instruction those bytes are.