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While building libffi for purecap Morello I noticed that the functions written in assembly were not getting the LSB set so were entered without C64 and trapped immediately. It turns out the assembly file has .type ffi_call_SYSV, #function, but the directive is after the label declaration, and this results in an object file without the LSB set in the resulting symbol.

working:

.global foo
.type foo, @function
foo:
    ret c30
.size foo, .-foo

broken:

.global foo
foo:
    ret c30
.type foo, @function
.size foo, .-foo