la_ow_syscall

This kernel modules provides compatibility with LoongArch's old-world ABI, making it possible to run old-world applications (such as Kingsoft's WPS Office and Tencent QQ) transparently on new-world (ABI 2.0) kernels and userspaces.

Requirements

Linux Kernel >= 6.1.0 for loongarch64 with the following option(s) set:

• CONFIG_KALLSYMS=y (for reading kernel symbol addresses).
• CONFIG_KPROBES=y (for probing kernel symbol addresses using kernels where base address randomisation - CONFIG_RANDOMIZE_BASE - is enabled).

Installation

You may install this kernel both as an in-tree module, an out-of-tree DKMS dynamic module, or a version-specific module. You may pick any option that best suits your needs.

In-tree module

Copy this source tree as arch/loongarch/ow_syscall in your kernel tree and append the following to arch/loongarch/Kbuild:

obj-y += ow_syscall/

After building the kernel with make, run the following command to build the kernel module:

# $PWD is containing built objects
# /path/to/source_dir is containing Linux source code
make \
    -C /path/to/source_dir \
    ARCH=loongarch \
    O="$PWD" \
    arch/loongarch/ow_syscall/la_ow_syscall.ko \
    CONFIG_LOONGARCH_OW_SYSCALL=m

Upon completion, copy the kernel module in place (/lib/modules/.../arch/loongarch/ow_syscall/la_ow_syscall.ko) and re-generate modules.dep and map files:

depmod

DKMS dynamic module

Generate a dkms.conf:

make dkms.conf

For installation and version management, refer to dkms(8) for details.

Version-specific module

Build the kernel module:

make

Load the module with super user or root privilege:

insmod la_ow_syscall.ko