Bug 727656

Summary:	assembler_x86 emits REX.W prefix for instructions that don't support it
Product:	[Fedora] Fedora	Reporter:	Andreas Girgensohn <andreasg123>
Component:	java-1.6.0-openjdk	Assignee:	Deepak Bhole <dbhole>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	15	CC:	ahughes, dbhole, jon.vanalten, jvanek, lkundrak, mjw, mmatejov, omajid
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-08-07 15:56:34 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Andreas Girgensohn 2011-08-02 18:44:38 UTC

Description of problem:

Bug 720854 uncovered a problem where valgrind did not handle a PTEST instruction with the REX.W prefix.  According to Jakub Jelinek and the Intel 64 and IA-32 Architectures Software Developer’s Manual (http://www.intel.com/Assets/PDF/manual/325383.pdf), that instruction does not support that prefix.

I went through hotspot/src/cpu/x86/vm/assembler_x86.cpp and checked instructions against the Instruction Set Reference.  The following instructions do not list REX.W as an option (with page numbers of the reference).

MOVDQA (p. 3-671)
MOVDQU (p. 3-674)
PCMPESTRI (p. 4-85)
PSRLQ (p. 4-244)
PTEST (p. 4-262)

The corresponding methods should probably call prefix_and_encode instead of prefixq_and_encode.


Version-Release number of selected component (if applicable):

java-1.6.0-openjdk-1.6.0.0-58.1.10.2.fc15.x86_64
tomcat6-6.0.30-6.fc15.noarch
valgrind-3.6.1-4.fc15.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Launch tomcat6 from valgrind (see options below)

Actual results:

valgrind raises a SIGILL signal

Expected results:

valgrind and tomcat would run

Additional info:

In /usr/sbin/tomcat6:

JAVACMD="/usr/bin/valgrind --smc-check=all --trace-children=yes
--log-file=/var/log/tomcat6/valgrind.out --leak-check=yes --tool=memcheck
${JAVACMD}"

Comment 1 Fedora End Of Life 2012-08-07 15:56:36 UTC

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