Extending the ELF file format definition in LLVM

The ELF file format is one of the binary object file formats that LLVM has support for to read and write. ELF itself is defined for many CPU architectures, and there is also a definition for the M88k architecture. All we need to do is to add the definition of the relocations and some flags. The relocations are given in Chapter 4, Object Files, of the System V ABI M88k Processor supplement book:

1. We need to type the following into the llvm/include/llvm/BinaryFormat/ELFRelocs/M88k.def file:

   #ifndef ELF_RELOC
   #error "ELF_RELOC must be defined"
   #endif
   ELF_RELOC(R_88K_NONE, 0)
   ELF_RELOC(R_88K_COPY, 1)
   // Many more…

2. We also add some flags to the llvm/include/llvm/BinaryFormat/ELF.h file and include the relocation definitions:

   // M88k Specific e_flags
   enum : unsigned {
     EF_88K_NABI = 0x80000000,   // Not ABI compliant
     EF_88K_M88110 = 0x00000004  // File uses 88110-
   &...