Add the aarch64-unknown-uefi target

* This commit adds the aarch64-unknown-uefi target and also adds it into
the supported targets list under the tier-3 target table.
* Uses the small code model by default

Signed-off-by: Andy-Python-Programmer <[email protected]>

compiler/rustc_target/src/spec/aarch64_unknown_uefi.rs

@@ -0,0 +1,27 @@
+// This defines the aarch64 target for UEFI systems as described in the UEFI specification. See the
+// uefi-base module for generic UEFI options.
+
+use super::uefi_msvc_base;
+use crate::spec::{LinkerFlavor, LldFlavor, Target};
+
+pub fn target() -> Target {
+    let mut base = uefi_msvc_base::opts();
+
+    base.max_atomic_width = Some(64);
+
+    let pre_link_args_msvc = vec!["/machine:arm64".to_string()];
+
+    base.pre_link_args.get_mut(&LinkerFlavor::Msvc).unwrap().extend(pre_link_args_msvc.clone());
+    base.pre_link_args
+        .get_mut(&LinkerFlavor::Lld(LldFlavor::Link))
+        .unwrap()
+        .extend(pre_link_args_msvc);
+
+    Target {
+        llvm_target: "aarch64-unknown-windows".to_string(),
+        pointer_width: 64,
+        data_layout: "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: "aarch64".to_string(),
+        options: base,
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -917,6 +917,7 @@ supported_targets! {
 
     ("x86_64-unknown-uefi", x86_64_unknown_uefi),
     ("i686-unknown-uefi", i686_unknown_uefi),
+    ("aarch64-unknown-uefi", aarch64_unknown_uefi),
 
     ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
 

src/doc/rustc/src/platform-support.md

@@ -200,6 +200,7 @@ target | std | host | notes
 `aarch64-apple-tvos` | * |  | ARM64 tvOS
 `aarch64-unknown-freebsd` | ✓ | ✓ | ARM64 FreeBSD
 `aarch64-unknown-hermit` | ? |  |
+`aarch64-unknown-uefi` | * |  | ARM64 UEFI
 `aarch64-unknown-linux-gnu_ilp32` | ✓ | ✓ | ARM64 Linux (ILP32 ABI)
 `aarch64-unknown-netbsd` | ✓ | ✓ |
 `aarch64-unknown-openbsd` | ✓ | ✓ | ARM64 OpenBSD