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<a name="S_002f390-and-System-z-Features"></a>
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Next: <a href="Sparc-Features.html#Sparc-Features" accesskey="n" rel="next">Sparc Features</a>, Previous: <a href="RX-Features.html#RX-Features" accesskey="p" rel="prev">RX Features</a>, Up: <a href="Standard-Target-Features.html#Standard-Target-Features" accesskey="u" rel="up">Standard Target Features</a> [<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.5.14 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 ‘<samp>org.gnu.gdb.s390.core</samp>’ 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 ‘<samp>pswm</samp>’, ‘<samp>pswa</samp>’, and ‘<samp>r0</samp>’ through ‘<samp>r15</samp>’.
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 ‘<samp>pswm</samp>’ and ‘<samp>pswa</samp>’, as well as the general
register’s upper halves ‘<samp>r0h</samp>’ through ‘<samp>r15h</samp>’, and their
lower halves ‘<samp>r0l</samp>’ through ‘<samp>r15l</samp>’.
</p>
<p>The ‘<samp>org.gnu.gdb.s390.fpr</samp>’ feature is required. It should
contain the 64-bit registers ‘<samp>f0</samp>’ through ‘<samp>f15</samp>’, and
‘<samp>fpc</samp>’.
</p>
<p>The ‘<samp>org.gnu.gdb.s390.acr</samp>’ feature is required. It should
contain the 32-bit registers ‘<samp>acr0</samp>’ through ‘<samp>acr15</samp>’.
</p>
<p>The ‘<samp>org.gnu.gdb.s390.linux</samp>’ feature is optional. It should
contain the register ‘<samp>orig_r2</samp>’, which is 64-bit wide on System z
targets and 32-bit otherwise. In addition, the feature may contain
the ‘<samp>last_break</samp>’ register, whose width depends on the addressing
mode, as well as the ‘<samp>system_call</samp>’ register, which is always
32-bit wide.
</p>
<p>The ‘<samp>org.gnu.gdb.s390.tdb</samp>’ feature is optional. It should
contain the 64-bit registers ‘<samp>tdb0</samp>’, ‘<samp>tac</samp>’, ‘<samp>tct</samp>’,
‘<samp>atia</samp>’, and ‘<samp>tr0</samp>’ through ‘<samp>tr15</samp>’.
</p>
<p>The ‘<samp>org.gnu.gdb.s390.vx</samp>’ feature is optional. It should contain
64-bit wide registers ‘<samp>v0l</samp>’ through ‘<samp>v15l</samp>’, which will be
combined by <small>GDB</small> with the floating point registers ‘<samp>f0</samp>’
through ‘<samp>f15</samp>’ to present the 128-bit wide vector registers
‘<samp>v0</samp>’ through ‘<samp>v15</samp>’. In addition, this feature should
contain the 128-bit wide vector registers ‘<samp>v16</samp>’ through
‘<samp>v31</samp>’.
</p>
<p>The ‘<samp>org.gnu.gdb.s390.gs</samp>’ feature is optional. It should contain
the 64-bit wide guarded-storage-control registers ‘<samp>gsd</samp>’,
‘<samp>gssm</samp>’, and ‘<samp>gsepla</samp>’.
</p>
<p>The ‘<samp>org.gnu.gdb.s390.gsbc</samp>’ feature is optional. It should contain
the 64-bit wide guarded-storage broadcast control registers
‘<samp>bc_gsd</samp>’, ‘<samp>bc_gssm</samp>’, and ‘<samp>bc_gsepla</samp>’.
</p>
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