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Add initial libstd support for Xous #104101

Merged
merged 17 commits into from
Sep 19, 2023
Merged

Add initial libstd support for Xous #104101

merged 17 commits into from
Sep 19, 2023

Commits on Aug 22, 2023

  1. libstd: add xous to libstd 

    Add the `xous` target to libstd. Currently this defers everything to the
`unsupported` target.

Signed-off-by: Sean Cross <sean@xobs.io>
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    xobs committed Aug 22, 2023
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  2. std: xous: add os-specific ffi calls 

    Xous has no C FFI. Instead, all FFI is done via syscalls that are
specified in Rust. Add these FFI calls to libstd, as well as some of the
currently-supported syscalls.

This enables Rust programs to interact with the Xous operating system
while avoiding adding an extra dependency to libstd.

Signed-off-by: Sean Cross <sean@xobs.io>
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    xobs committed Aug 22, 2023
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  3. std: xous: the basics of os 

    Add the basics to get the operating system running, including how to
exit the operating system.

Since Xous has no libc, there is no default entrypoint. Add a `_start`
entrypoint to the system-specific os module.

Signed-off-by: Sean Cross <sean@xobs.io>
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  4. std: net: skip tests on xous 

    Network functionality is not yet ready for merging.

Signed-off-by: Sean Cross <sean@xobs.io>
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  5. std: fs: skip fs tests on xous 

    The xous filesystem support is not yet ready for merging.

Signed-off-by: Sean Cross <sean@xobs.io>
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  6. std: process: skip tests on xous 

    Xous does not yet support spawning processes.

Signed-off-by: Sean Cross <sean@xobs.io>
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  7. bootstrap: builder: don't add origin paths on xous 

    Don't add the origin rpath when calling the linker. This is unnecessary
on Xous since there is no dynamic linker, and Xous can use an ordinary
bare-metal linker with no rpath options.

As part of this patch, the logic was inverted so that the "else" clause
contains everything except "windows" and "xous".

Signed-off-by: Sean Cross <sean@xobs.io>
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    xobs committed Aug 22, 2023
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  8. std: xous: add alloc support 

    Basic alloc support on Xous is supported by the `dlmalloc` crate. This
necessitates bumping the dlmalloc version to 0.2.4.

Signed-off-by: Sean Cross <sean@xobs.io>
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  9. panic_abort: call __rust_abort on xous 

    Xous does not properly handle invalid instructions. Instead, call
`__rust_abort` and exit normally.

Signed-off-by: Sean Cross <sean@xobs.io>
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  10. std: xous: add services support 

    Xous has a concept of `services` that provide various features.
Processes may connect to these services by name or by address. Most
services require a name server in order to connect.

Add a file with the most common services, and provide a way to connect
to a service by querying the name server.

Signed-off-by: Sean Cross <sean@xobs.io>
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  11. std: xous: add output support for stdio 

    Add support for stdout. This enables basic console printing via
`println!()`. Output is written to the log server.

Signed-off-by: Sean Cross <sean@xobs.io>
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  12. std: xous: add support for time 

    Add support for determining the current time. This connects to the
ticktimer server in order to get the system uptime.

Signed-off-by: Sean Cross <sean@xobs.io>
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  13. std: xous: add thread support 

    Add initial support for threads on Xous. This includes thread creation
and joining.

Signed-off-by: Sean Cross <sean@xobs.io>
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  14. std: xous: add thread_local_key 

    Add an implementation of thread local storage. This uses a container
that is pointed to by the otherwise-unsed `$tp` register. This container
is allocated on-demand, so threads that use no TLS will not allocate
this extra memory.

Signed-off-by: Sean Cross <sean@xobs.io>
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    xobs committed Aug 22, 2023
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  15. std: xous: add support for locks 

    Add support for Condvar, Mutex, and RWLock. These are all backed by the
ticktimer server.

Signed-off-by: Sean Cross <sean@xobs.io>
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  16. Cargo.lock: bump compiler_builtins to 0.1.101 

    The Xous operating system has no libc, and relies on `compiler_builtins`
to supply basic functions such as `memcpy`. Bump the version to 0.1.101
to pull in a version of this crate with the flag enabled for Xous.

Signed-off-by: Sean Cross <sean@xobs.io>
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  17. std: enable feature(slice_ptr_len) on xous 

    Xous passes slice pointers around in order to manipulate memory.
This is feature-gated behind `slice_ptr_len`. Xous is currently
the only target to use this feature, so gate it behind an OS flag.

Signed-off-by: Sean Cross <sean@xobs.io>
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    xobs committed Aug 22, 2023
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