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<title>Debugging with GDB: S/390 and System z Features</title>

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<a name="S_002f390-and-System-z-Features"></a>
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<p>
Next: <a href="TIC6x-Features.html#TIC6x-Features" accesskey="n" rel="next">TIC6x Features</a>, Previous: <a href="PowerPC-Features.html#PowerPC-Features" accesskey="p" rel="prev">PowerPC Features</a>, Up: <a href="Standard-Target-Features.html#Standard-Target-Features" accesskey="u" rel="up">Standard Target Features</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="S_002f390-and-System-z-Features-1"></a>
<h4 class="subsection">G.4.9 S/390 and System z Features</h4>
<a name="index-target-descriptions_002c-S_002f390-features"></a>
<a name="index-target-descriptions_002c-System-z-features"></a>

<p>The &lsquo;<samp>org.gnu.gdb.s390.core</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>pswm</samp>&rsquo;, &lsquo;<samp>pswa</samp>&rsquo;, and &lsquo;<samp>r0</samp>&rsquo; through &lsquo;<samp>r15</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>pswm</samp>&rsquo; and &lsquo;<samp>pswa</samp>&rsquo;, as well as the general
register&rsquo;s upper halves &lsquo;<samp>r0h</samp>&rsquo; through &lsquo;<samp>r15h</samp>&rsquo;, and their
lower halves &lsquo;<samp>r0l</samp>&rsquo; through &lsquo;<samp>r15l</samp>&rsquo;.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.s390.fpr</samp>&rsquo; feature is required.  It should
contain the 64-bit registers &lsquo;<samp>f0</samp>&rsquo; through &lsquo;<samp>f15</samp>&rsquo;, and
&lsquo;<samp>fpc</samp>&rsquo;.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.s390.acr</samp>&rsquo; feature is required.  It should
contain the 32-bit registers &lsquo;<samp>acr0</samp>&rsquo; through &lsquo;<samp>acr15</samp>&rsquo;.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.s390.linux</samp>&rsquo; feature is optional.  It should
contain the register &lsquo;<samp>orig_r2</samp>&rsquo;, which is 64-bit wide on System z
targets and 32-bit otherwise.  In addition, the feature may contain
the &lsquo;<samp>last_break</samp>&rsquo; register, whose width depends on the addressing
mode, as well as the &lsquo;<samp>system_call</samp>&rsquo; register, which is always
32-bit wide.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.s390.tdb</samp>&rsquo; feature is optional.  It should
contain the 64-bit registers &lsquo;<samp>tdb0</samp>&rsquo;, &lsquo;<samp>tac</samp>&rsquo;, &lsquo;<samp>tct</samp>&rsquo;,
&lsquo;<samp>atia</samp>&rsquo;, and &lsquo;<samp>tr0</samp>&rsquo; through &lsquo;<samp>tr15</samp>&rsquo;.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.s390.vx</samp>&rsquo; feature is optional.  It should contain
64-bit wide registers &lsquo;<samp>v0l</samp>&rsquo; through &lsquo;<samp>v15l</samp>&rsquo;, which will be
combined by <small>GDB</small> with the floating point registers &lsquo;<samp>f0</samp>&rsquo;
through &lsquo;<samp>f15</samp>&rsquo; to present the 128-bit wide vector registers
&lsquo;<samp>v0</samp>&rsquo; through &lsquo;<samp>v15</samp>&rsquo;.  In addition, this feature should
contain the 128-bit wide vector registers &lsquo;<samp>v16</samp>&rsquo; through
&lsquo;<samp>v31</samp>&rsquo;.
</p>


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