Rollup merge of #110482 - chrisnc:armv8r-target, r=wesleywiser

Add armv8r-none-eabihf target for the Cortex-R52.

compiler/rustc_target/src/spec/mod.rs

@@ -1543,6 +1543,7 @@ supported_targets! {
     ("armebv7r-none-eabihf", armebv7r_none_eabihf),
     ("armv7r-none-eabi", armv7r_none_eabi),
     ("armv7r-none-eabihf", armv7r_none_eabihf),
+    ("armv8r-none-eabihf", armv8r_none_eabihf),
 
     ("x86_64-pc-solaris", x86_64_pc_solaris),
     ("sparcv9-sun-solaris", sparcv9_sun_solaris),

compiler/rustc_target/src/spec/targets/armv8r_none_eabihf.rs

@@ -0,0 +1,35 @@
+// Targets the Little-endian Cortex-R52 processor (ARMv8-R)
+
+use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "armv8r-none-eabihf".into(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
+        arch: "arm".into(),
+
+        options: TargetOptions {
+            abi: "eabihf".into(),
+            linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
+            linker: Some("rust-lld".into()),
+            relocation_model: RelocModel::Static,
+            panic_strategy: PanicStrategy::Abort,
+            // The Cortex-R52 has two variants with respect to floating-point support:
+            // 1. fp-armv8, SP-only, with 16 DP (32 SP) registers
+            // 2. neon-fp-armv8, SP+DP, with 32 DP registers
+            // Use the lesser of these two options as the default, as it will produce code
+            // compatible with either variant.
+            //
+            // Reference:
+            // Arm Cortex-R52 Processor Technical Reference Manual
+            // - Chapter 15 Advanced SIMD and floating-point support
+            features: "+fp-armv8,-fp64,-d32".into(),
+            max_atomic_width: Some(64),
+            emit_debug_gdb_scripts: false,
+            // GCC defaults to 8 for arm-none here.
+            c_enum_min_bits: Some(8),
+            ..Default::default()
+        },
+    }
+}