Commit Graph

7 Commits

Author SHA1 Message Date
Norman Feske
813731a1e0 base-linux: permit rt_sigreturn on 64-bit ARM 2022-01-19 12:38:11 +01:00
Norman Feske
2f9d430c00 base-linux: 64-bit ARM support
This patch adds support for running Genode/Linux on the AARCH64
architecture.

- The kernel-agnostic startup code (crt0) had to be extended to
  capture the initial stack pointer, which the Linux kernel uses
  to pass the process environment. This is in line with the
  existing startup code for x86_32 and x86_64.

- The link order of the host libraries linked to lx_hybrid
  programs had to be adjusted such that libgcc appears at last
  because the other libraries depend on symbols provided by
  libgcc.

- When using AARCH64 Linux as host, one can execute run scripts
  via 'make run/<script> KERNEL=linux BOARD=linux' now.

Issue 
2021-05-10 11:17:20 +02:00
Norman Feske
fdb1a4dd88 base-linux: avoid legacy syscalls
Until now, Genode's Linux system call bindings were based on original
Unix system calls that were later superseded by more flexibile variants.
E.g., 'openat' is a modern version of 'open'. Even though Linux upholds
the compatiblity with the original versions for existing architectures
like x86, the legacy syscalls are absent for the recently added AARCH64
architecture. A good overview of the system calls accross the prominent
architectures can be found at

https://chromium.googlesource.com/chromiumos/docs/+/master/constants/syscalls.md

This patch updates Genode's syscall bindings to avoid legacy versions,
thereby easing the support for AARCH64. The used "modern" versions
were introduced back in Linux version 2 days. So we are fine to rely
on them.

The patch slightly changes the signature for lx_stat because this system
call is merely used to check for the existance of a file and its size.
The new name 'lx_stat_size' draws a closer connection to its use case.
That said, the stat syscall has not been updated to the modern statx
since statx is still a fairly recent addition.

Issue 
2021-05-05 11:35:31 +02:00
Christian Prochaska
9b6cc75f1c tool/seccomp: allow 'restart_syscall' on x86_64
Fixes 
2020-07-30 08:49:23 +02:00
Norman Feske
0310c733d5 base-linux: let seccomp permit 'read'
This is needed for using the 'wait_for_continue' debug mechanism.

Fixes 
2020-07-03 11:58:31 +02:00
Christian Helmuth
93ab972ddc tool/seccomp: allow sigreturn on x86
Fixes 
2020-07-03 11:15:33 +02:00
Stefan Thöni
78497c03ca base-linux: enabled seccomp
base-linux uses seccomp to reduce the available system calls
to the minimum set needed to run base-linux. There are still
some syscalls that allow accessing global state which should
be further reduced.

The combination of seccomp and socket descriptor caps should
provide an intermediate level of security for base-linux
thereby enabling base-linux as a migration path from using
the Linux kernel to the use of microkernel-based Genode.

Fixes 
2020-05-27 11:56:46 +02:00