The recent changes to naked `asm!()` macros made this unbuildable
on Xous. The upstream package maintainer released 0.2.3 to fix support
on newer nightly toolchains.

Update the dependency to 0.2.3, which is the oldest version that works
with the current nightly compiler.

This closes rust-lang#131602 and fixes the build on xous.

Signed-off-by: Sean Cross <[email protected]>

Process arguments and environment variables are both passed by way of
Application Parameters. These are a TLV format that gets passed in as
the second process argument.

This patch combines both as they are very similar in their decode.

Signed-off-by: Sean Cross <[email protected]>

Signed-off-by: Sean Cross <[email protected]>

The AdjustProcessLimit syscall was using the correct call number.

Signed-off-by: Sean Cross <[email protected]>

The allocator on Xous is now throwing warnings because the allocator
needs to be mutable, and allocators hand out mutable pointers, which
the `static_mut_refs` lint now catches.

Give the same treatment to Xous as wasm, at least until a solution is
devised for fixing the warning on wasm.

Signed-off-by: Sean Cross <[email protected]>

This was added in cc3c8bb when it was
closer to the `extract_one` call. Move it back near that call.

the line was missing closing parenthesis

…=thomcc

Various fixes for Xous

This patchset includes several fixes for Xous that have crept in over the last few months:

* The `adjust_process()` syscall was incorrect
* Warnings have started appearing in `alloc` -- adopt the same approach as wasm, until wasm figures out a workaround
* Dead code warnings have appeared in the networking code. Add `allow(dead_code)` as these structs are used as IPC values
* Add support for `args` and `env`, which have been useful for running tests
* Update `unwinding` to `0.2.3` which fixes the recent regression due to changes in `asm!()` code

…dy, r=lcnr

rustc_metadata: minor tidying

Cleaned up some code while investigating rust-lang#131720.

See individual commits.

…kingjubilee

Bump libc to 0.2.161

Bumps libc to the latest release version 0.2.161 which
- includes libc support for the tier 3 RTEMS target
- fixes segfaults on 32-bit FreeBSD targets
- gets musl's `posix_spawn_file_actions_addchdir_np` for some spawn opts

Missing parenthesis

the line was missing closing parenthesis

… r=compiler-errors

Allow dropping dyn principal

Revival of rust-lang#126660, which was a revival of rust-lang#114679. Fixes rust-lang#126313.

Allows dropping principal when coercing trait objects, e.g. `dyn Debug + Send` -> `dyn Send`.

cc `@compiler-errors` `@Jules-Bertholet`
r? `@lcnr`