Add loong64 support in seccomp and PIE

[zhaixiaojuan]

I resubmitted a PR to replace #3765

The LoongArch architecture (LoongArch) is an Instruction Set Architecture (ISA) that has a RISC style.
Documentations:
ISA:
https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html
ABI:
https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html
More docs can be found at:
https://loongson.github.io/LoongArch-Documentation/README-EN.html

[yzewei]

LGTM!

[lifubang]

I'll approve to run the CI, but don’t forget to sign off your commit!

[lifubang]

There are two questions:

1. We might also need to update the documentation regarding the supported architectures:
   https://github.com/zhaixiaojuan/runc/blob/be0377ce139f0a406d3d0f472d5c1b1f7e625053/docs/spec-conformance.md?plain=1#L14
2. Relatedly, have you actually tested this support on a LoongArch64 (loong64) machine?

[AkihiroSuda]

https://github.com/opencontainers/runc/blob/main/docs/spec-conformance.md needs to be updated too

[zhaixiaojuan]

2. Relatedly, have you actually tested this support on a LoongArch64 (loong64) machine?

For LoongArch, since there is no Ubuntu system, we tested it on the Debian system and it can be used normally. Debian upstream has already released runc package: http://ftp.ports.debian.org/debian-ports/pool-loong64/main/r/runc/

Here are links for submitting LoongArch runc patches to Debian upstream:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1069166
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1095452

LoongArch runc packages have also been released for OpenEuler and Anolis systems:
https://repo.openeuler.org/openEuler-24.03-LTS/OS/loongarch64/Packages/
https://mirrors.openanolis.cn/anolis/23.2/os/loongarch64/os/Packages/

[zhaixiaojuan]

@lifubang
Hi, I checked the test failures for "test (ubuntu-24.04, 1.25.x, criu-dev)" and it seems to be unrelated to the modified code.