The PNaCl ABI is defined here: https://developers.google.com/native-client/dev/reference/pnacl-bitcode-abi https://developers.google.com/native-client/dev/refer

The PNaCl ABI is defined here: https://developers.google.com/native-client/dev/reference/pnacl-bitcode-abi https://developers.google.com/native-client/dev/reference/pn... - and it's definitely a work in progress we'll be trying to improve. As for Pepper, it's also all documented here and below - https://developers.google.com/native-client/dev/pepperc/ https://developers.google.com/native-client/dev/pepperc/ Granted, this is documentation, not a standards-body spec.