Auto merge of #104101 - betrusted-io:xous-libstd-initial, r=bjorn3

Add initial libstd support for Xous

This patchset adds some minimal support to the tier-3 target `riscv32imac-unknown-xous-elf`. The following features are supported:

* alloc
* thread creation and joining
* thread sleeping
* thread_local
* panic_abort
* mutex
* condvar
* stdout

Additionally, internal support for the various Xous primitives surrounding IPC have been added as part of the Xous FFI. These may be exposed as part of `std::os::xous::ffi` in the future, however for now they are not public.

This represents the minimum viable product. A future patchset will add support for networking and filesystem support.

Author: bors

Diff for: Cargo.lock

@@ -644,9 +644,9 @@ checksum = "55b672471b4e9f9e95499ea597ff64941a309b2cdbffcc46f2cc5e2d971fd335"
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.100"
+version = "0.1.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6c0f24437059853f0fa64afc51f338f93647a3de4cf3358ba1bb4171a199775"
+checksum = "01a6d58e9c3408138099a396a98fd0d0e6cfb25d723594d2ae48b5004513fd5b"
 dependencies = [
  "cc",
  "rustc-std-workspace-core",

Diff for: library/panic_abort/src/lib.rs

@@ -43,7 +43,8 @@ pub unsafe fn __rust_start_panic(_payload: &mut dyn BoxMeUp) -> u32 {
                 libc::abort();
             }
         } else if #[cfg(any(target_os = "hermit",
-                            all(target_vendor = "fortanix", target_env = "sgx")
+                            all(target_vendor = "fortanix", target_env = "sgx"),
+                            target_os = "xous"
         ))] {
             unsafe fn abort() -> ! {
                 // call std::sys::abort_internal

Diff for: library/std/Cargo.toml

@@ -36,8 +36,8 @@ object = { version = "0.32.0", default-features = false, optional = true, featur
 rand = { version = "0.8.5", default-features = false, features = ["alloc"] }
 rand_xorshift = "0.3.0"
 
-[target.'cfg(any(all(target_family = "wasm", target_os = "unknown"), all(target_vendor = "fortanix", target_env = "sgx")))'.dependencies]
-dlmalloc = { version = "0.2.3", features = ['rustc-dep-of-std'] }
+[target.'cfg(any(all(target_family = "wasm", target_os = "unknown"), target_os = "xous", all(target_vendor = "fortanix", target_env = "sgx")))'.dependencies]
+dlmalloc = { version = "0.2.4", features = ['rustc-dep-of-std'] }
 
 [target.x86_64-fortanix-unknown-sgx.dependencies]
 fortanix-sgx-abi = { version = "0.5.0", features = ['rustc-dep-of-std'], public = true }

Diff for: library/std/build.rs

@@ -37,6 +37,7 @@ fn main() {
         || target.contains("nintendo-3ds")
         || target.contains("vita")
         || target.contains("nto")
+        || target.contains("xous")
         // See src/bootstrap/synthetic_targets.rs
         || env::var("RUSTC_BOOTSTRAP_SYNTHETIC_TARGET").is_ok()
     {

Diff for: library/std/src/fs.rs

@@ -8,7 +8,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx"))))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx", target_os = "xous"))))]
 mod tests;
 
 use crate::ffi::OsString;

Diff for: library/std/src/lib.rs

@@ -260,6 +260,7 @@
     feature(slice_index_methods, coerce_unsized, sgx_platform)
 )]
 #![cfg_attr(windows, feature(round_char_boundary))]
+#![cfg_attr(target_os = "xous", feature(slice_ptr_len))]
 //
 // Language features:
 // tidy-alphabetical-start

Diff for: library/std/src/net/tcp.rs

@@ -1,6 +1,6 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "xous"))))]
 mod tests;
 
 use crate::io::prelude::*;

Diff for: library/std/src/net/udp.rs

@@ -1,4 +1,4 @@
-#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx"))))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx", target_os = "xous"))))]
 mod tests;
 
 use crate::fmt;

Diff for: library/std/src/os/mod.rs

@@ -146,6 +146,8 @@ pub mod vita;
 pub mod vxworks;
 #[cfg(target_os = "watchos")]
 pub(crate) mod watchos;
+#[cfg(target_os = "xous")]
+pub mod xous;
 
 #[cfg(any(unix, target_os = "wasi", doc))]
 pub mod fd;