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<h4 class="subsection">G.5.13 S/390 and System z Features</h4>

<p><a name="index-target-descriptions_002c-S_002f390-features-3670"></a><a name="index-target-descriptions_002c-System-z-features-3671"></a>
The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.core</span></samp>&rsquo; feature is required for S/390 and
System z targets.  It should contain the PSW and the 16 general
registers.  In particular, System z targets should provide the 64-bit
registers &lsquo;<samp><span class="samp">pswm</span></samp>&rsquo;, &lsquo;<samp><span class="samp">pswa</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">r0</span></samp>&rsquo; through &lsquo;<samp><span class="samp">r15</span></samp>&rsquo;. 
S/390 targets should provide the 32-bit versions of these registers. 
A System z target that runs in 31-bit addressing mode should provide
32-bit versions of &lsquo;<samp><span class="samp">pswm</span></samp>&rsquo; and &lsquo;<samp><span class="samp">pswa</span></samp>&rsquo;, as well as the general
register's upper halves &lsquo;<samp><span class="samp">r0h</span></samp>&rsquo; through &lsquo;<samp><span class="samp">r15h</span></samp>&rsquo;, and their
lower halves &lsquo;<samp><span class="samp">r0l</span></samp>&rsquo; through &lsquo;<samp><span class="samp">r15l</span></samp>&rsquo;.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.fpr</span></samp>&rsquo; feature is required.  It should
contain the 64-bit registers &lsquo;<samp><span class="samp">f0</span></samp>&rsquo; through &lsquo;<samp><span class="samp">f15</span></samp>&rsquo;, and
&lsquo;<samp><span class="samp">fpc</span></samp>&rsquo;.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.acr</span></samp>&rsquo; feature is required.  It should
contain the 32-bit registers &lsquo;<samp><span class="samp">acr0</span></samp>&rsquo; through &lsquo;<samp><span class="samp">acr15</span></samp>&rsquo;.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.linux</span></samp>&rsquo; feature is optional.  It should
contain the register &lsquo;<samp><span class="samp">orig_r2</span></samp>&rsquo;, which is 64-bit wide on System z
targets and 32-bit otherwise.  In addition, the feature may contain
the &lsquo;<samp><span class="samp">last_break</span></samp>&rsquo; register, whose width depends on the addressing
mode, as well as the &lsquo;<samp><span class="samp">system_call</span></samp>&rsquo; register, which is always
32-bit wide.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.tdb</span></samp>&rsquo; feature is optional.  It should
contain the 64-bit registers &lsquo;<samp><span class="samp">tdb0</span></samp>&rsquo;, &lsquo;<samp><span class="samp">tac</span></samp>&rsquo;, &lsquo;<samp><span class="samp">tct</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">atia</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">tr0</span></samp>&rsquo; through &lsquo;<samp><span class="samp">tr15</span></samp>&rsquo;.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.vx</span></samp>&rsquo; feature is optional.  It should contain
64-bit wide registers &lsquo;<samp><span class="samp">v0l</span></samp>&rsquo; through &lsquo;<samp><span class="samp">v15l</span></samp>&rsquo;, which will be
combined by <span class="sc">gdb</span> with the floating point registers &lsquo;<samp><span class="samp">f0</span></samp>&rsquo;
through &lsquo;<samp><span class="samp">f15</span></samp>&rsquo; to present the 128-bit wide vector registers
&lsquo;<samp><span class="samp">v0</span></samp>&rsquo; through &lsquo;<samp><span class="samp">v15</span></samp>&rsquo;.  In addition, this feature should
contain the 128-bit wide vector registers &lsquo;<samp><span class="samp">v16</span></samp>&rsquo; through
&lsquo;<samp><span class="samp">v31</span></samp>&rsquo;.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.gs</span></samp>&rsquo; feature is optional.  It should contain
the 64-bit wide guarded-storage-control registers &lsquo;<samp><span class="samp">gsd</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">gssm</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">gsepla</span></samp>&rsquo;.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.s390.gsbc</span></samp>&rsquo; feature is optional.  It should contain
the 64-bit wide guarded-storage broadcast control registers
&lsquo;<samp><span class="samp">bc_gsd</span></samp>&rsquo;, &lsquo;<samp><span class="samp">bc_gssm</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">bc_gsepla</span></samp>&rsquo;.

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