Where is the x86-64 System V ABI documented?

Question

The x86-64 System V ABI (used on everything except Windows) used to live at http://x86-64.org/documentation/abi.pdf, but that site has now fallen off the internet.

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Answer 1

Linux standard base

The Linux Standard Base, which can be considered by some the authoritative spec for this matter, has section called 7.2. "Function Calling Sequence" points to the 2.1. "Normative References section" which contains the following links:

• System V Application Binary Interface, Edition 4.1 http://www.sco.com/developers/devspecs/gabi41.pdf
• System V Application Binary Interface - DRAFT - 17 December 2003 http://www.sco.com/developers/gabi/2003-12-17/contents.html
• System V Application Binary Interface AMD64 Architecture Processor Supplement, Draft Version 0.95 http://refspecs.linux-foundation.org/elf/x86_64-abi-0.95.pdf

I would therefore recommend using those versions of the specifications as the canonical ones unless you have good reason to do otherwise.