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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 ‘<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>’. |
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