Split out Rust BPF no-std stuff (#4968)

sdk/bpf/rust/rust-test/.gitignore

@@ -0,0 +1,3 @@
+/target/
+
+Cargo.lock

sdk/bpf/rust/rust-test/Cargo.toml

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+
+[package]
+name = "solana-sdk-bpf-test"
+version = "0.17.0"
+description = "Solana BPF SDK Rust Cargo test utilities"
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[workspace]
+members = []

sdk/bpf/rust/rust-test/src/lib.rs

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+//! @brief Solana Rust-based BPF program utility functions and types
+
+#[no_mangle]
+pub unsafe fn sol_log_(message: *const u8, length: u64) {
+    let slice = std::slice::from_raw_parts(message, length as usize);
+    let string = std::str::from_utf8(&slice).unwrap();
+    std::println!("{}", string);
+}
+
+#[no_mangle]
+pub fn sol_log_64_(arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64) {
+    std::println!("{} {} {} {} {}", arg1, arg2, arg3, arg4, arg5);
+}