Mark Shank markshank

## ravynOS_MachO_loading.md

      
        
          
            
              
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                mszoek
                / ravynOS_MachO_loading.md
            
            
              Last active
              October 15, 2023 20:11
            
              
                ravynOS: Executing MachO
              
          
        
      
        
  
      
    Some notes on implementing MachO loading and dyld on ravynOS as an early PoC.

So far, I have modified rtld-elf (the FreeBSD runtime linker) to handle simple MachO objects. It can now
successfully load and run a trivial MachO executable built on a Mac with an external library dependency (libSystem.B.dylib - the C library). The linker also still handles ELF objects, so I call this monstrosity the "Macho ELF".
Loading a MachO object into the dynamic linker

★ zoe@haru ~/airyx-freebsd/libexec/dyldᐳ llvm-objdump -d hello