Ghidra Starlet (Wii IOS) processor spec - place these files in Processors/ARM/data/languages

ARM_Starlet.slaspec

@define ENDIAN "big"
@define T_VARIANT ""
@define VERSION_5 ""
@define VERSION_5E ""

@include "ARM.sinc"

# Hacky because we can't define a new token for bits 5-15 since sleigh doesn't
# allow adding new fields to the instrArm token
ioscallnum: value is c0507 & c0811 & c1212 & c1313 & c1414=0 & c1515=0
    [ value = (c0507 | c0811 << 3 | c1212 << 7 | c1313 << 8); ]
{ export *[const]:1 value; }

define pcodeop ios_syscall;
:iossyscall^COND ioscallnum	is $(AMODE) & COND & c0004=0x10 & c1627=0x600 & ioscallnum
{
    build COND;
    ios_syscall(ioscallnum);
}

Starlet.ldefs

<?xml version="1.1" encoding="UTF-8"?>
<language_definitions>
  <language processor="ARM"
            endian="big"
            size="32"
            variant="Starlet"
            version="1.0"
            slafile="ARM_Starlet.sla"
            processorspec="ARMt_v45.pspec"
            manualindexfile="../manuals/ARM.idx"
            id="ARM:BE:32:Starlet">
    <description>Starlet</description>
    <compiler name="default" spec="ARM_v45.cspec" id="default"/>
  </language>
</language_definitions>

Starlet.trans

<?xml version="1.0" encoding="UTF-8"?>
<!-- Allow conversion from regular arm to starlet.  This is a noop. -->
<language_translation>
    <from_language version="1">ARM:BE:32:v8</from_language>
    <to_language version="1">ARM:BE:32:Starlet</to_language>
</language_translation>

Note: To generate ARM_Starlet.sla manually, run (on Linux x86-64):

<Ghidra install dir>/Ghidra/Features/Decompiler/os/linux_x86_64/sleigh -a Processors/ARM/

Ghidra also automatically generates it when you first use it.