Add test for x86_64-unknown-none target

tests/Sanity/rust-x86_64-unknown-none-smoke/demo.rs

@@ -0,0 +1,62 @@
+// Credit where credit is due. This test was made following this article:
+// https://vulns.xyz/2023/03/linux-executable-from-scratch-with-x86_64-unknown-none-rust/
+
+// Opt-out the use of std, as x86_64-unknown-none doesn't have standard library
+#![no_std]
+// Inform the compiler that we don't have a main function, we'll be specifying
+// the program entry point using global_asm.
+#![no_main]
+
+use core::arch::asm;
+use core::arch::global_asm;
+use core::panic::PanicInfo;
+
+// As we don't have std library, we need to write our own panic handler
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    exit(1);
+}
+
+// Program entry point, adjust stack pointer and call main
+global_asm! {
+    ".global _start",
+    "_start:",
+    "mov rdi, rsp",
+    "call main"
+}
+
+// exit syscall
+fn exit(status: i32) -> ! {
+    unsafe {
+        asm!(
+            "syscall",
+            in("rax") 60,
+            in("rdi") status,
+            options(noreturn)
+        );
+    }
+}
+
+// write syscall
+unsafe fn write(fd: i32, buf: *const u8, count: usize) -> isize {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") 1isize => r0,
+        in("rdi") fd,
+        in("rsi") buf,
+        in("rdx") count,
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags)
+    );
+    r0
+}
+
+// Tell the compiler to not mangle the function name. We're calling main
+// with this name from global_asm
+#[no_mangle]
+unsafe fn main(_stack_top: *const u8) -> ! {
+    write(1, b"Hello world\n".as_ptr(), 12);
+    exit(0);
+}

tests/Sanity/rust-x86_64-unknown-none-smoke/main.fmf

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+summary: Smoke test for the x86_64-unknown-none target
+description: Compile and run a minimal example using x86_64-unknown-none target
+duration: 2m
+tier: 1
+# Additional requires
+require+:
+  - rust-std-static-x86_64-unknown-none
+adjust+:
+  - when: distro < rhel-10 or distro < fedora-38
+    enabled: false
+
+  - when: arch != x86_64
+    enabled: false

tests/Sanity/rust-x86_64-unknown-none-smoke/runtest.sh

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+#!/bin/bash
+# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+rlJournalStart
+    rlPhaseStartSetup
+        declare tmp
+        rlRun "tmp=\$(mktemp -d)" 0 "Create tmp directory"
+        rlRun "cp demo.rs $tmp"
+        rlRun "pushd $tmp"
+        rlRun "set -o pipefail"
+    rlPhaseEnd
+
+    rlPhaseStartTest
+        rlRun "rustc --target x86_64-unknown-none demo.rs -o demo"
+        rlRun "./demo | grep 'Hello world'"
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlRun "popd"
+        rlRun "rm -r $tmp" 0 "Remove tmp directory"
+    rlPhaseEnd
+rlJournalEnd