Where is the PowerPC object file format documented?
Object files generated by PPCAsm and MrC/MrCpp use the Extended Common Object File Format (XCOFF). An Apple document describing XCOFF is not currently available, however, IBM provides an online description of XCOFF. The XCOFF.h interface file (found in the CIncludes folder) contains a complete set of data structures and macros for dealing with XCOFF.