It defines the 32-bit Power Architecture processor specific ELF ABI for the GNU/Linux Operating System and Embedded environments.
I served as the document owner, style-sheet maintainer, and TSC Chair (for the last year). It's very rewarding (relieving) to see this finally published. It was a pleasure to work with everyone on the TSC. Their expertise and contributions were invaluable.
There are three versions of the document: the Linux & Embedded (Unified), the Linux, and the Embedded. These are all generated from the same parent document and are separated for convenience of the readers.