msp430_none_elf.rs

// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use {LinkerFlavor, PanicStrategy};
use target::{Target, TargetOptions, TargetResult};

pub fn target() -> TargetResult {
    Ok(Target {
        llvm_target: "msp430-none-elf".to_string(),
        target_endian: "little".to_string(),
        target_pointer_width: "16".to_string(),
        data_layout: "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16".to_string(),
        arch: "msp430".to_string(),
        target_os: "none".to_string(),
        target_env: "".to_string(),
        target_vendor: "".to_string(),
        linker_flavor: LinkerFlavor::Gcc,

        options: TargetOptions {
            executables: true,

            // 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: vec!["-mcpu=msp430".to_string()],
            linker: "msp430-elf-gcc".to_string(),
            no_integrated_as: true,

            // There are no atomic instructions available in the MSP430
            // instruction set
            max_atomic_width: Some(0),

            // 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: "static".to_string(),

            .. Default::default( )
        }
    })
}