https://bugs.kde.org/show_bug.cgi?id=498494
Bug ID: 498494
Summary: illegal instructions with none/tests/amd64/rdseed and
rdrand on FreeBSD compiled with clang
Classification: Developer tools
Product: valgrind
Version: unspecified
Platform: FreeBSD Ports
OS: FreeBSD
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: pjfl...@wanadoo.fr
Target Milestone: ---
Both run OK outside of Valgrind.
rdseed gives me
paulf@freebsd:~/valgrind $ ./vg-in-place ./none/tests/amd64/rdseed
==78559== Memcheck, a memory error detector
==78559== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==78559== Using Valgrind-3.25.0.GIT and LibVEX; rerun with -h for copyright
info
==78559== Command: ./none/tests/amd64/rdseed
==78559==
vex amd64->IR: unhandled instruction bytes: 0x49 0xF 0xC7 0xFB 0x41 0xF 0x92
0xC4 0x4C 0x89
vex amd64->IR: REX=1 REX.W=1 REX.R=0 REX.X=0 REX.B=1
vex amd64->IR: VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=0F
vex amd64->IR: PFX.66=0 PFX.F2=0 PFX.F3=0
That's this
2017c7: 49 0f c7 fb rdseedq %r11
and rdrand
paulf@freebsd:~/valgrind $ ./vg-in-place ./none/tests/amd64/rdrand
==78572== Memcheck, a memory error detector
==78572== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==78572== Using Valgrind-3.25.0.GIT and LibVEX; rerun with -h for copyright
info
==78572== Command: ./none/tests/amd64/rdrand
==78572==
vex amd64->IR: unhandled instruction bytes: 0x49 0xF 0xC7 0xF3 0x41 0xF 0x92
0xC4 0x4C 0x89
vex amd64->IR: REX=1 REX.W=1 REX.R=0 REX.X=0 REX.B=1
vex amd64->IR: VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=0F
vex amd64->IR: PFX.66=0 PFX.F2=0 PFX.F3=0
That's
2017c7: 49 0f c7 f3 rdrandq %r11
My guess is that clang is emitting a slight variation of the opcode which VEX
doesn't decode.
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