1 files changed, 59 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/spec/msp430_none_elf.rs b/compiler/rustc_target/src/spec/msp430_none_elf.rs
new file mode 100644
index 000000000..6b09386ae
--- /dev/null
+++ b/compiler/rustc_target/src/spec/msp430_none_elf.rs
@@ -0,0 +1,59 @@
+use crate::spec::{cvs, PanicStrategy, RelocModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "msp430-none-elf".into(),
+        pointer_width: 16,
+        data_layout: "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16".into(),
+        arch: "msp430".into(),
+
+        options: TargetOptions {
+            c_int_width: "16".into(),
+
+            // The LLVM backend currently can't generate object files. To
+            // workaround this LLVM generates assembly files which then we feed
+            // to gcc to get object files. For this reason we have a hard
+            // dependency on this specific gcc.
+            asm_args: cvs!["-mcpu=msp430"],
+            linker: Some("msp430-elf-gcc".into()),
+            linker_is_gnu: false,
+
+            // There are no atomic CAS instructions available in the MSP430
+            // instruction set, and the LLVM backend doesn't currently support
+            // compiler fences so the Atomic* API is missing on this target.
+            // When the LLVM backend gains support for compile fences uncomment
+            // the `singlethread: true` line and set `max_atomic_width` to
+            // `Some(16)`.
+            max_atomic_width: Some(0),
+            atomic_cas: false,
+            // singlethread: true,
+
+            // Because these devices have very little resources having an
+            // unwinder is too onerous so we default to "abort" because the
+            // "unwind" strategy is very rare.
+            panic_strategy: PanicStrategy::Abort,
+
+            // Similarly, one almost always never wants to use relocatable
+            // code because of the extra costs it involves.
+            relocation_model: RelocModel::Static,
+
+            // Right now we invoke an external assembler and this isn't
+            // compatible with multiple codegen units, and plus we probably
+            // don't want to invoke that many gcc instances.
+            default_codegen_units: Some(1),
+
+            // Since MSP430 doesn't meaningfully support faulting on illegal
+            // instructions, LLVM generates a call to abort() function instead
+            // of a trap instruction. Such calls are 4 bytes long, and that is
+            // too much overhead for such small target.
+            trap_unreachable: false,
+
+            // See the thumb_base.rs file for an explanation of this value
+            emit_debug_gdb_scripts: false,
+
+            eh_frame_header: false,
+
+            ..Default::default()
+        },
+    }
+}