Possible options

• Use maloader
• Use original Darwin DyLd, needs Blocks

Loader Strategy

Loader strategy for symbol lookup:

• dlsym() on "__darwin_" + name, strip '$suffix' from name
• dlsym() on name, strip '$suffix' from name
• Search Darwin dynamic libraries for symbol called name

Maloader

Missing section handling

• S_SYMBOL_STUBS - see MachOBinder.hpp, doBindIndirectSymbols()
• S_CSTRING_LITERALS - not handled by original dyld
• S_ZEROFILL - not handled
• S_LAZY_DYLIB_SYMBOL_POINTERS - might have another alias?
• S_INTERPOSING - register interposing, see ImageLoaderMachO::registerInterposing()
• S_COALESCED - not handled
• ...

Current status

• no support for image unloading
• no support for lazy loading
• need to implement @rpath
• only doing flat loading, reexports used in two-level namespaces are ignored; interesting notes on the topic of symbol order of search
• other stuff should be quite OK

Links

• Mach-O File Format
• Mac OS X shared library initialization