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<title>8.README.S390</title>
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<a name="dist.readme-s390"></a>8.README.S390</h1></div></div></div>
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<br>
Requirements<br>
------------<br>
-YouneedGCC3.4orlatertocompilethes390port.<br>
-Torunvalgrindaz10machineoranylatermodelisrecommended.<br>
Oldermachinemodelsdowntoandincludingz990mayworkbuthave<br>
notbeentestedextensively.<br>
<br>
<br>
Limitations<br>
-----------<br>
-31-bitclientprogramsarenotsupported.<br>
-Hexadecimalfloatingpointisnotsupported.<br>
-Transactionalmemoryisnotsupported.<br>
-Instructionsoperatingonvectorregistersarenotsupported.<br>
-memcheck,cachegrind,drd,helgrind,massif,lackey,andnoneare<br>
supported.<br>
-Onmachinemodelspredatingz10,cachegrindwillassumeaz10cache<br>
architecture.Otherwise,cachegrindwillquerythehostscachesystem<br>
andusethoseparameters.<br>
-callgrindandallexperimentaltoolsarecurrentlynotsupported.<br>
-Somegccversionsusemvctocopy4/8bytevalues.Thiswillaffect<br>
certaindebugmessages.Forexample,memcheckwillcomplainabout<br>
4one-bytereads/writesinsteadofjustasingleread/write.<br>
-Thetransactional-executionfacilityisnotsupported;itismasked<br>
offfromHWCAP.<br>
-Thevectorfacilityisnotsupported;itismaskedofffromHWCAP.<br>
<br>
<br>
Hardwarefacilities<br>
-------------------<br>
Valgrinddoesnotrequirethatthehostmachinehasthesamehardware<br>
facilitiesasthemachineforwhichtheclientprogramwascompiled.<br>
Thisisconvenient.Ifpossible,theJITcompilerwilltranslatethe<br>
clientinstructionsaccordingtothefacilitiesavailableonthehost.<br>
Thismeans,though,thatprobingforhardwarefacilitiesbyissuing<br>
instructionsfromthatfacilityandobservingwhetherSIGILListhrown<br>
maynotwork.Asaconsequence,programsthatattempttodosomay<br>
behavedifferently.Itisbelievedthatthisisarareusecase.<br>
<br>
<br>
Recommendations<br>
---------------<br>
Applicationsshouldbecompiledwith-fno-builtintoavoid<br>
falsepositivesduetobuiltinstringoperationswhenrunningmemcheck.<br>
<br>
<br>
ReadingMaterial<br>
----------------<br>
(1)LinuxforzSeriesELFABISupplement<br>
http://refspecs.linuxfoundation.org/ELF/zSeries/index.html<br>
(2)z/ArchitecturePrinciplesofOperation<br>
http://publibfi.boulder.ibm.com/epubs/pdf/dz9zr010.pdf<br>
(3)z/ArchitectureReferenceSummary<br>
http://publibfi.boulder.ibm.com/epubs/pdf/dz9zs008.pdf<br>
<br>
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