long long value decompile

[SquallATF]

as return value the register order is v1 v0 should modify allegrex.cspec line 58 like this

                <pentry minsize="5" maxsize="8">
                    <addr space="join" piece1="v1" piece2="v0"/>
                </pentry>

and as parameter like SceOff sceIoLseek(SceUID fd, SceOff offset, int whence) the parameter storage link this

fd a0
offset a3, a2
whence t0

but I don't known how to modify cspec, can use custom storage in edit function

[kotcrab]

I tried to fix this but looks like Ghidra can't currently support this, see issue NationalSecurityAgency/ghidra#2762

Added joined registers to cspec like so:

                <pentry minsize="1" maxsize="4">
                    <register name="a0"/>
                </pentry>
                <pentry minsize="1" maxsize="4">
                    <register name="a1"/>
                </pentry>
                <pentry minsize="5" maxsize="8">
                    <addr space="join" piece1="a1" piece2="a0"/>
                </pentry>

And the result I'm getting:

For what's it worth you can handle such functions with Use custom storage option.

I fixed the endianness for long long return values.