No description
Mathieu Benoit
36d726f0a1
crypto/ec/ec_local.h:520:2: error:
"Can not enable ec_nistp_64_gcc_128 on big-endian systems"
Arch enables this elliptic-curve optimisation, which uses a 128-bit
integer representation that assumes little-endian byte order. s390x is
BIG-endian.
This is the first time in the whole port that endianness -- rather than
word size, instruction set or packaging layout -- decides anything. Ten
packages so far diverged on 32-bit multilib, missing front ends or path
conventions; this one diverges on how bytes are ordered in a word.
OpenSSL refuses at compile time rather than producing wrong results,
which is the right call and makes this one honest to diagnose. Dropping
the flag costs some NIST curve performance and nothing else: the curves
still work through the portable implementation.
--- FR ---
crypto/ec/ec_local.h:520:2: error:
"Can not enable ec_nistp_64_gcc_128 on big-endian systems"
Arch active cette optimisation de courbes elliptiques, qui repose sur
une representation entiere 128 bits supposant l ordre petit-boutiste.
s390x est GROS-boutiste.
C est la premiere fois dans tout le portage que l endianness -- et non
la taille de mot, le jeu d instructions ou la convention de chemins --
tranche quoi que ce soit. Dix paquets ont diverge jusqu ici sur le
multilib 32 bits, des frontaux absents ou des dispositions de
repertoires ; celui-ci diverge sur l ordre des octets dans un mot.
OpenSSL refuse a la compilation plutot que de produire des resultats
faux, ce qui est le bon choix et rend ce cas honnete a diagnostiquer.
Retirer l option coute un peu de performance sur les courbes NIST, et
rien d autre : elles fonctionnent par l implementation portable.
Assisted-by: Claude Opus 5
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| CODEOWNERS | ||
| Containerfile | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
| TODO.md | ||
Arch Linux s390x
A port of Arch Linux to IBM s390x mainframe architecture with systemd support.
Boots a full Arch Linux system on IBM mainframes (or QEMU s390x emulation) using a hybrid build: cross-compilation for the kernel, native s390x compilation on z/VM for userspace.
Quick Start
make container # build dev container (first time)
cp .env.example .env # configure z/VM access
make all # build kernel + initramfs + systemd
make test-systemd # boot it
What Works
- Arch Linux kernel 6.18.6-arch1 with Arch patches, cross-compiled
- Initramfs via modified mkinitcpio
- Static busybox built natively on z/VM, 2.3MB
- Root filesystem with ext4, switch_root to real rootfs
- Systemd as PID 1
Pacman, bash, and GNU coreutils are not yet ported.
Build System
The build uses two tiers:
Cross-compilation (x86_64 host): Kernel is built in a Fedora 43 container with s390x-linux-gnu-gcc. Initramfs is generated with a patched mkinitcpio that handles cross-architecture binary injection.
Native compilation (s390x z/VM): Busybox and systemd must be built on real s390x hardware. The z/VM system runs RHEL 9.6 with GCC 11.5.0. Scripts handle SSH deployment and retrieval automatically via .env configuration.