The PowerPC port is complete, although less supported than other architectures.
The port owner is Bernhard Urban.
A nice introduction to PowerPC assembly language at http://www.ibm.com/developerworks/linux/library/l-ppc/
- On macOS, the conventions are documented in the Mach-O Runtime Architecture.
- On AIX and i, the conventions are documented in the AIX assembler language reference.
- Linux on PPC32 uses the The PowerPC SystemV ABI specification.
- On 64-bit PowerPC, there are two calling conventions. One is the ELF v1 ABI used on almost all big-endian systems, which are similar to AIX and use function descriptors.
- The other 64-bit PowerPC calling convention is the ELF v2 ABI, used by little-endian systems and a few big-endian systems. This ABI has no function desxcriptors and is closer to the PPC32 ABI.