# Static Rust AArch64 hello-world fixture

This fixture is an ordinary Rust `std` program compiled as a static
`aarch64-unknown-linux-musl` executable. It enters through musl startup,
initializes Rust's signal handling and allocator, runs `main`, writes through
Rust's standard output implementation, and exits through libc.

Build from any working directory with rustc 1.93.0, cargo-zigbuild 0.21.4,
Zig 0.16.0, and the `aarch64-unknown-linux-musl` Rust target:

```sh
guest-tests/rust-hello/build.sh
```

The release profile uses one code-generation unit, size optimization, LTO,
abort-on-panic, and symbol stripping. The linker build ID is disabled. The ELF
is checked in so native and browser tests execute identical bytes without a
cross toolchain at test time.

Expected SHA-256:

```text
3ffa48e7f5a1f44f065eeba4e0f3f1b1b300690d1c03331d307f5e4569484e49
```

The deterministic success path executes 4,880 AArch64 instructions and 20
syscalls. In addition to terminal output and exit, it exercises signal action,
mask, and alternate-stack setup; a one-CPU affinity model; anonymous memory
mapping, protection, and unmapping; atomics and memory barriers; scalar
multiplication and division; and the small NEON subset used to initialize
structures and count affinity bits.