2018-01-30 03:56:01 +00:00
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# `libucontext`
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`libucontext` is a library which provides the `ucontext.h` C API. Unlike other implementations,
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it faithfully follows the kernel process ABI when doing context swaps.
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Notably, when combined with `gcompat`, it provides a fully compatible implementation of the ucontext
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functions that are ABI compatible with glibc.
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## supported architectures
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Adding support for new architectures is easy, but you need to know assembly language to do it.
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2018-02-02 18:51:55 +00:00
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Right now these archs are supported and should work on bare metal:
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2018-01-30 03:56:01 +00:00
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2018-02-01 01:28:19 +00:00
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* x86
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2018-01-30 03:56:01 +00:00
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* x86_64
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2018-01-31 04:13:42 +00:00
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* armv6+ (`arm`)
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2018-01-31 21:23:18 +00:00
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* aarch64
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2018-02-15 05:55:26 +00:00
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* s390x
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2018-02-02 18:51:55 +00:00
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These archs require kernel assistance and use a syscall (the only assembly is the trampoline):
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2018-02-02 18:45:42 +00:00
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* ppc
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2018-02-06 08:05:53 +00:00
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* ppc64 (ELFv2 ABI spec only, ELFv1 not supported)
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2018-02-14 03:06:01 +00:00
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## building
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`libucontext` uses a simple makefile build system. You should define `ARCH=` at build time, otherwise
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the build system will attempt to guess using `uname -m`.
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```
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$ make ARCH=x86_64
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$ make ARCH=x86_64 check
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$ make ARCH=x86_64 DESTDIR=out install
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```
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## support
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`libucontext` is offered as part of the `gcompat` project. Accordingly, please address all questions
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and bug reports to gcompat@lists.adelielinux.org.
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