Add reference URLs in elf/amdgpu.h
Adds URLs to the AMDGPU ELF header definitions to clarify where the enumeration values originate.
This commit adds reference URLs to the AMDGPU ELF header definitions in elf/amdgpu.h. The URLs point to the source of truth for the enumeration values, specifically the LLVM documentation. This change improves code readability and makes it easier to understand the origin and meaning of these values.
In Details
The include/elf/amdgpu.h header defines AMDGPU-specific extensions to the ELF format, such as EF_AMDGPU_MACH_* flags and ELFABIVERSION_AMDGPU_HSA_* ABI versions. These values are used by the AMDGPU backend in LLVM and the driver stack. Adding URLs to the LLVM documentation clarifies the origin of these constants, which could otherwise be obscure. This change primarily benefits developers working on the AMDGPU toolchain or those needing to understand the structure of AMDGPU ELF files.
For Context
ELF headers contain metadata that describes the contents and structure of compiled binaries. One part of the ELF header includes fields used to identify the target architecture and ABI of the code within. For AMD GPUs, the elf/amdgpu.h header defines the values used for these fields. This commit enhances the header file by adding URLs that point to the official documentation for these values, making it easier for developers to understand their meaning and usage. This is especially helpful when working with specialized hardware architectures like GPUs, where the ELF header fields can have specific meanings.