libucontext is a library which provides the ucontext.h C API. Unlike other implementations,
it faithfully follows the kernel process ABI when doing context swaps.
Notably, when combined with gcompat, it provides a fully compatible implementation of the ucontext
functions that are ABI compatible with glibc.
Adding support for new architectures is easy, but you need to know assembly language to do it.
Right now these archs are supported and should work on bare metal:
- x86
- x86_64
- armv6+ (
arm) - aarch64
- s390x
- mips (O32 ABI only)
- mips64 (N32/N64 ABI only, like Alpine, only N64 ABI has been tested)
- riscv64
These archs require kernel assistance and use a syscall:
- ppc
- ppc64 (ELFv2 ABI spec only, ELFv1 not supported)
libucontext uses a simple makefile build system. You should define ARCH= at build time, otherwise
the build system will attempt to guess using uname -m.
$ make ARCH=x86_64
$ make ARCH=x86_64 check
$ make ARCH=x86_64 DESTDIR=out install