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<a name="dist.readme-s390"></a>8.�README.S390</h1></div></div></div>
<div class="literallayout"><p><br>
������<br>
Requirements<br>
------------<br>
-�You�need�GCC�3.4�or�later�to�compile�the�s390�port.<br>
-�To�run�valgrind�a�z10�machine�or�any�later�model�is�recommended.<br>
��Older�machine�models�down�to�and�including�z990�may�work�but�have<br>
��not�been�tested�extensively.<br>
<br>
<br>
Limitations<br>
-----------<br>
-�31-bit�client�programs�are�not�supported.<br>
-�Hexadecimal�floating�point�is�not�supported.<br>
-�Transactional�memory�is�not�supported.<br>
-�Instructions�operating�on�vector�registers�are�not�supported.<br>
-�memcheck,�cachegrind,�drd,�helgrind,�massif,�lackey,�and�none�are<br>
��supported.�<br>
-�On�machine�models�predating�z10,�cachegrind�will�assume�a�z10�cache<br>
��architecture.�Otherwise,�cachegrind�will�query�the�hosts�cache�system<br>
��and�use�those�parameters.<br>
-�callgrind�and�all�experimental�tools�are�currently�not�supported.<br>
-�Some�gcc�versions�use�mvc�to�copy�4/8�byte�values.�This�will�affect<br>
��certain�debug�messages.�For�example,�memcheck�will�complain�about<br>
��4�one-byte�reads/writes�instead�of�just�a�single�read/write.<br>
-�The�transactional-execution�facility�is�not�supported;�it�is�masked<br>
��off�from�HWCAP.<br>
-�The�vector�facility�is�not�supported;�it�is�masked�off�from�HWCAP.<br>
<br>
<br>
Hardware�facilities<br>
-------------------<br>
Valgrind�does�not�require�that�the�host�machine�has�the�same�hardware<br>
facilities�as�the�machine�for�which�the�client�program�was�compiled.<br>
This�is�convenient.�If�possible,�the�JIT�compiler�will�translate�the<br>
client�instructions�according�to�the�facilities�available�on�the�host.<br>
This�means,�though,�that�probing�for�hardware�facilities�by�issuing<br>
instructions�from�that�facility�and�observing�whether�SIGILL�is�thrown<br>
may�not�work.�As�a�consequence,�programs�that�attempt�to�do�so�may<br>
behave�differently.�It�is�believed�that�this�is�a�rare�use�case.<br>
<br>
<br>
Recommendations<br>
---------------<br>
Applications�should�be�compiled�with�-fno-builtin�to�avoid<br>
false�positives�due�to�builtin�string�operations�when�running�memcheck.<br>
<br>
<br>
Reading�Material<br>
----------------<br>
(1)�Linux�for�zSeries�ELF�ABI�Supplement<br>
����http://refspecs.linuxfoundation.org/ELF/zSeries/index.html<br>
(2)�z/Architecture�Principles�of�Operation<br>
����http://publibfi.boulder.ibm.com/epubs/pdf/dz9zr010.pdf<br>
(3)�z/Architecture�Reference�Summary<br>
����http://publibfi.boulder.ibm.com/epubs/pdf/dz9zs008.pdf<br>
<br>
����</p></div>
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