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> Because the Application Binary Interface (ABI) of ARM and x86-64 is different How does Rosettafied x86 code call system code then?

• EdSchouten 4y ago
  System calls tend to have a _very_ basic calling convention. Typically up to six arguments, of which all of them are integers or pointers. No floating-point values. It's fairly easy to translate such calls. Even if translation is non-trivial, there are only a finite number of system calls (hundreds). It's not hard to provide bindings for those.
  • lisper 4y ago
    Yeah, I didn't phrase my question very well. I didn't mean "system calls" as in kernel calls. I meant system libraries, i.e. Cocoa frameworks. Quartz. Homekit. That sort of thing.
    • EdSchouten 4y ago
      I think all of those are simply built as universal libraries as well, right?
      • lisper 4y ago
        I have no idea. That's what I'm asking. But I don't think that's the case because Rosetta is a separate download. If it included universal binaries for all the system libraries it would be huge.