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<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"></head><body>
<h2>Cross compile build for aarch64</h2>
<p>This page describes the steps necessary to perform a cros compile build
for aarch64 and how to run the resultant images under the Foundation model
(ARM's freely available aarc64 simulator).
</p><p>The steps basically comprise the following
</p><dl>
<dt>Step 1</dt><dd><a href="#Sysroots">Obtain an aarch64 sysroots</a><br>
</dd><dt>Step 2</dt><dd><a href="#BuildOpenJDK">Configure and compile OpenJDK</a>
</dd><dt>Step 3</dt><dd><a href="#GetModel">Download the Foundation model</a>
</dd><dt>Step 4</dt><dd><a href="#RootFS">Obtain a kernel and root filesystem</a><br>
</dd><dt>Step 5</dt><dd><a href="#CopyOpenJDK">Copy your newly built OpenJDK image to the root filesystem</a>
</dd><dt>Step 6</dt><dd><a href="#BootModel">Boot the Foundation model and run your OpenJDK image</a>
</dd></dl>
<h3><a name="Sysroots"></a>Step 1: Obtain an aarch64 sysroots</h3>
<p>The sysroots directory contains all the cross compilation tools, aarch64
libraries and headers you will need to perform a cross compile build of
OpenJDK for aarch64.
</p><p>For convenience I have provided a pre-built sysroots at
<a href="http://people.linaro.org/%7Eedward.nevill/aarch64/sysroots.tar.gz">
http://people.linaro.org/~edward.nevill/aarch64/sysroots.tar.gz</a>
</p><p>Note that the above sysroots will only work if you are building on a 64-bit
x86 linux machine. If you are using anything else you will need to rebuild
the sysroots as the cross compilation tools will not work on your macine.
</p><p>Download the sysroots.tar.gz file above and untar it into the directory containing the jdk8 repository so that the <b>jdk8</b> directory and <b>sysroots</b> directory are at the same level.
</p><pre><code><b>
cd <directory containing jdk8>
tar xfz sysroots.tar.gz
ls
</b>
jdk8 sysroots sysroots.tar.gz
</code></pre>
<h3><a name="BuildOpenJDK"></a>Step 2: Configure and compile OpenJDK</h3>
<p>Two shell scripts have been provided to allow you to quickstart building OpenJDK.
</p><dl>
<dt>cross_configure</dt><dd>Configure for a cross compiled release build of OpenJDK
</dd><dt>cross_compile</dt><dd>Build the j2re and j2sdk images for the current configuration
</dd></dl>
<p>In theory all that should be necessary is
</p><pre><code><b>
cd jdk8
sh ./cross_configure
sh ./cross_compile 2>&1 | tee compile.log
</b></code></pre>
<p>This should build a client compiler (C1) release version of OpenJDK which may be found in <i>build/linux-aarch64-normal-client-release/images/j2sdk-image</i>
</p><p>Note: At the end of the build you may see an warning like
</p><pre>WARNING: You have the following ALT_ variables set:
ALT_SDT_H=/home/ed/work/aa64/sysroots/genericarmv8/usr/include/sys/sdt.h
ALT_ variables are deprecated and will be ignored. Please clean your environment.
</pre>
<p>This warning may be ignored. The ALT_SDT_H <b>is</b> required and is not ignored!
</p><h4>Changing build/config options</h4>
<p>To build a debug version edit the <i>cross_configure</i> file and change <b>--with-debug-level=release</b>
to one of <b>--with-debug-level=fastdebug</b> or <b>--with-debug-level=slowdebug</b>
</p><p>To build a Zero release change <b>--with-jvm-variants=client</b> to <b>--with-jvm-variants=zero</b>. You can
also specify <b>--with-jvm-variants=server</b>, however the server (C2) compiler is still under development
at the time of writing.
</p><p>If you specify a new configuration such as <b>--with-debug-level=slowdebug</b> you may get the following
error when you run the <i>cross_compile</i> script.
</p><pre>No CONF given, but more than one configuration found in /home/ed/work/aarch64_tip/jdk8//build.
Available configurations:
* linux-aarch64-normal-client-slowdebug
* linux-aarch64-normal-client-release
Please retry building with CONF=<config pattern=""> (or SPEC=<specfile>)
</specfile></config></pre>
<p>To select which configuation you wish to build specify CONF=... before the <i>cross_compile</i> script. For example:
</p><pre><code><b>
CONF=linux-aarch64-normal-client-slowdebug sh ./cross_compile 2>&1 | tee compile.log
</b></code></pre>
<p>Some other useful options you can specify to configure are:
</p><dl>
<dt>--enable-debug-symbols</dt><dt>--disable-debug-symbols
</dt><dd>Enable/disable generation of debug symbols
</dd><dt>--enable-zip-debug-info</dt><dt>--disable-zip-debug-info
</dt><dd>Enable/disable zipping of debug-info files
</dd></dl>
<h3><a name="GetModel"></a>Step 3: Download the Foundation model</h3>
Download the foundation model from ARM's website at
<a href="http://www.arm.com/products/tools/models/fast-models/foundation-model.php">
http://www.arm.com/products/tools/models/fast-models/foundation-model.php
</a>
<p>At the bottom of the page under <i>Get started with Foundation Models</i>
click on <i>download now</i>. You will be asked to login. If you have
prevously registered for an ARM account login, otherwise you will need
to check the license terms, ensure that you are happy with them and
register for an ARM account.
</p><p>After logging in above, on the right hand side of the next page under
<i>ARM V8 Foundation Model</i> click <i>Download Now</i>.
</p><p>The name of the file I downloaded was <i>FM000-KT-00035-r0p8-48rel5.tgz</i>.
Obviously the name of the file you download may differ depending on the
version number you download, but if you want to download exactly the
same version number you can look for it under "Display older versions".
</p><p>Untar this archive. It will create a directory 'Foundation_v8pkg'. cd to
this directory
</p><pre><code><b>
tar xfz FM000-KT-00035-r0p8-48rel5.tgz
cd Foundation_v8pkg
</b></code></pre>
<h3><a name="RootFS"></a>Step 4: Download a kernel and root filesystem</h3>
<p>For convenience I have provided a pre-built kernel and pre-populated rootfs at
</p><ul>
<li><a href="http://people.linaro.org/%7Eedward.nevill/aarch64/kernel.axf">
http://people.linaro.org/~edward.nevill/aarch64/kernel.axf</a>
</li><li><a href="http://people.linaro.org/%7Eedward.nevill/aarch64/rootfs.ext2.gz">
http://people.linaro.org/~edward.nevill/aarch64/rootfs.ext2.gz</a>
</li></ul>
<p>Download both these files into the <i>Foundation_v8pkg</i> directory created above
and decompress the <i>rootfs.ext2.gz</i>
</p><pre><code><b>
gzip -d rootfs.ext2.gz
</b></code></pre>
<h3><a name="CopyOpenJDK"></a>Step 5: Copy your OpenJDK image into your rootfs</h3>
<p>First of all you must mount the root file system. Then copy the OpenJDK image into
the home directory of root. Then unmount the filesystem.
</p><pre><code><b>
sudo mount -o loop rootfs.ext2 /mnt
sudo cp -r .../jdk8/build/linux-aarch64-normal-client-release/images/j2sdk-image /mnt/home/root
sudo umount /mnt
</b></code></pre>
<h3><a name="BootModel"></a>Step 6: Boot the Foundation model and run OpenJDK</h3>
<p>To boot the Foundation model enter
</p><pre><code><b>
./models/Linux64_GCC-4.1/Foundation_v8 --image kernel.axf --block-device rootfs.ext2 --network nat
</b></code></pre>
<p>An xterm window will open and Linux will boot in the aarch64 simulator. After a short
while you will get the root '#' prompt. In the root directory you should find the
<i>j2sdk-image</i> directory you copied earlier in addition to a <i>JavaApps</i> directory
which contains some sample Java applications.
</p><pre><code><b>
ls</b>
JavaApps j2sdk-image
</code></pre>
<p>The following are brief instructions on running each of the provided sample applications.
In each case you can specify the following options.
</p><dl>
<dt>-Xint</dt><dd>Run everything under the template interpreter
</dd><dt>-Xcomp</dt><dd>Attempt to compile every single method
</dd><dt>-Xmixed</dt><dd>The default. Mixed interpretation and compilation
</dd><dt>-XX:+PrintCompilation</dt><dd>Print a message as each method is compiled
</dd></dl>
<pre><code><b>
cd JavaApps/LinPack
../../../j2sdk-image/bin/java Linpack</b>
Mflops/s: 5.012 Time: 0.14 secs Norm Res: 1.43 Precision: 2.220446049250313E-16
<br>
<b>cd JavaApps/bm-1.1
../../j2sdk-image/bin/java -classpath dist/fullset/bench1.jar org.eembc.grinderbench.CmdlineWrapper -r 1 -m 1</b>
Copyright (c) 2003-2005, EDN Embedded Microprocessor Benchmark Consortium (EEMBC), Inc.
Parallel.....................8019
kXML.........................4451
PNG decoding.................8928
Chess........................3564
Crypto.......................4330
---------------------------------
<br>
<b>cd JavaApps/dry
../../j2sdk-image/bin/java dhry</b>
dhrystone (static): 10 iterations of 30000 executions..........
total time: 3310ms
Result: 90634 dhrystone/sec.
<br>
<b>cd JavaApps/ecm
../../j2sdk-image/bin/java CaffeineMarkEmbeddedApp</b>
Sieve score = 1574 (98)
Loop score = 2413 (2017)
Logic score = 4102 (0)
String score = 1135 (708)
Float score = 1609 (185)
Method score = 1905 (166650)
Overall score = 1945
</code></pre>
<p>The following programs require you to set the DISPLAY variable within
the simulator to the IP address of your X server. For example
</p><pre><code><b>
export DISPLAY=192.168.1.249:0.0
</b></code></pre>
<p>You will also need to ensure that your X server is capable of accepting a remote connection. Also note that
if you want to specify the -X options on the appletviewer command you will need to precede them with -J. For
example "-J-Xcomp -J-XX:+PrintCompilation"
</p><pre><code><b>
cd JavaApps/galaxians
../../j2sdk-image/bin/appletviewer Galaxians.html
<br>
cd JavaApps/scared
../../j2sdk-image/bin/appletviewer game.html
<br>
cd JavaApps/cm3
../../j2sdk-image/bin/appletviewer CaffeineMark30.html
</b></code></pre>
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