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update README with status table

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Ariadne Conill 2020-12-06 03:54:19 -07:00
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README.md
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@ -6,27 +6,28 @@ 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.
Since version 0.13, for some architectures, you can deploy to bare metal using newlib via the
`FREESTANDING=yes` make option. Systems which use a syscall cannot work this way. The table
below shows which architecture ports have been adapted to build with `FREESTANDING=yes`.
## 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)
* mips64 (N32/N64 ABI only, like Alpine, only N64 ABI has been tested)
* riscv64
* m68k
These archs require kernel assistance and use a syscall:
* ppc
* ppc64 (ELFv2 ABI spec only, ELFv1 not supported)
| Architecture | Works on musl | Syscall | Supports FREESTANDING |
|--------------|---------------|---------|-----------------------|
| aarch64 | ✓ | | |
| arm | ✓ | | |
| m68k | ✓ | | ✓ |
| mips | ✓ | | |
| mips64 | ✓ | | |
| ppc | ✓ | ✓ | |
| ppc64 | ✓ | ✓ | |
| riscv64 | ✓ | | |
| s390x | ✓ | | |
| x86 | ✓ | | |
| x86_64 | ✓ | | ✓ |
## building