FreeBSD ABI Specs

[David John]

Can somebody guide me in the right direction and point out the ABI Specs used in FreeBSD? Is it the same as System V ABI (https://software.intel.com/sites/default/files/article/402129/mpx-linux64-abi.pdf)?

Thank you.

 

[Phishfry]

I have read the term ABI over and over but I have never really seen a spec.
It seems the System V ABI is indeed used with different versions for 32 bit and 64 bit Intel plus Itanium has its own.
https://people.freebsd.org/~obrien/amd64-elf-abi.pdf

Here they note that there are small differences between Mac, Linux and FreeBSD
https://stackoverflow.com/questions/2171177/what-is-an-application-binary-interface-abi/2456882

More practically FreeBSD documents much in the source.
/usr/src/kern/syscalls.master

There does appear to be a dead link in the handbook for the DRAFT AMD64 ABI pdf
https://www.freebsd.org/platforms/amd64.html

 

[David John]

https://people.freebsd.org/~obrien/amd64-elf-abi.pdf

I have looked at this doc but it's not an official document (a draft version that's shared by a developer).

This stackoverflow question made me believe that the FreeBSD ABI is not exactly the same as Unix System V ABI.

/usr/src/kern/syscalls.master

Not sure how the syscall lookup is useful here?

Thank you Phishfry for your time and help.