Some are in stap and some in stapfuncs man pages. There is no description of the binary format for printf.
*** Bug 4957 has been marked as a duplicate of this bug. ***
Added printf directives and examples for each to stap.1.in, commit 0acffae
Since: 07e049a Added a little printf documentation. 1c1de83 Added %M info to stap.1.in printf() documentation is rather complete.