Currently updating the internal libseccomp syscall tables is a pain largely because the mapping information is spread across multiple files (e.g. "arch-*-syscalls.c"). I would like to propose we move all of the syscall mapping information into a common file which can then be used to generate the per-arch definitions at build time.

My current thought is to create a new CSV formatted file similar to the limited example below:

syscall,x86,x86_64,aarch64
read,3,0,63
write,4,1,64

Maintaining this file (e.g. adding new syscalls and/or ABIs over time) should be relatively easy due to the number of tools/scripts available for working with CSV files and generating a per-ABI syscall table (arch-X-syscalls.h?) from the CSV should be easy enough. There are some complications for some ABIs which have a fixed offset, e.g. x32/arm/mips/etc., but that should be easy enough to solve with a __SCMP_NR_BASE prefix similar to what we do today.