ucontext implementation featuring glibc-compatible ABI

Go to file

Ariadne Conill ef42ad682a s390x: fix makecontext(3) implementation for passing arguments via stack		2020-03-30 01:04:16 -05:00
arch	s390x: fix makecontext(3) implementation for passing arguments via stack	2020-03-30 01:04:16 -05:00
.gitignore	remove pointless gitignore entries	2020-03-29 13:44:06 +00:00
.mailmap	update copyright statements, add mailmap	2020-03-27 09:23:49 +00:00
LICENSE	update copyright statements, add mailmap	2020-03-27 09:23:49 +00:00
Makefile	makefile: add include path for arch/common	2020-03-29 13:46:19 +00:00
README.md	readme: note mips support	2020-03-29 15:59:18 +00:00
test_libucontext.c	test: swaps to f1 not main	2020-03-29 15:10:17 +00:00

README.md

`libucontext`

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.

supported architectures

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, like Alpine)
mips64 (N64 ABI only, like Alpine)

These archs require kernel assistance and use a syscall:

ppc
ppc64 (ELFv2 ABI spec only, ELFv1 not supported)

building

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

support

libucontext is offered as part of the gcompat project. Accordingly, please address all questions and bug reports to gcompat@lists.adelielinux.org.