There is a feature of target XML called flags. It allows
you to describe what a register contains.
https://sourceware.org/gdb/onlinedocs/gdb/Target-Description-Format.html
GDB has supported this for a long time and I recently added support
in LLDB:
e07a421dd5
This change adds this flags information for the cpsr register of the ARM7TDMI.
Based on the information in https://developer.arm.com/documentation/ddi0210/c/.
This is what it looks like when using GDB:
```
(gdb) info registers
r0 0x0 0
<...>
cpsr 0x6000001f [ Z C M=31 ]
```
And LLDB:
```
(lldb) register read cpsr
cpsr = 0x6000001f
= (N = 0, Z = 1, C = 1, V = 0, I = 0, F = 0, T = 0, M=31)
```
(the format is up to the debugger, lldb is a lot more verbose at the moment)
To enable this I have increased the GDB stub's outgoing buffer to 1400 bytes.
The target XML is just above 130 bytes with the flags added.
225456a39c