src/librustc_back/target/msp430_none_elf.rs

   1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use {LinkerFlavor, PanicStrategy};
  12 use target::{Target, TargetOptions, TargetResult};
  13
  14 pub fn target() -> TargetResult {
  15     Ok(Target {
  16         llvm_target: "msp430-none-elf".to_string(),
  17         target_endian: "little".to_string(),
  18         target_pointer_width: "16".to_string(),
  19         target_c_int_width: "16".to_string(),
  20         data_layout: "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16".to_string(),
  21         arch: "msp430".to_string(),
  22         target_os: "none".to_string(),
  23         target_env: "".to_string(),
  24         target_vendor: "".to_string(),
  25         linker_flavor: LinkerFlavor::Gcc,
  26
  27         options: TargetOptions {
  28             executables: true,
  29
  30             // The LLVM backend currently can't generate object files. To
  31             // workaround this LLVM generates assembly files which then we feed
  32             // to gcc to get object files. For this reason we have a hard
  33             // dependency on this specific gcc.
  34             asm_args: vec!["-mcpu=msp430".to_string()],
  35             linker: "msp430-elf-gcc".to_string(),
  36             no_integrated_as: true,
  37
  38             // There are no atomic instructions available in the MSP430
  39             // instruction set
  40             max_atomic_width: Some(0),
  41
  42             // Because these devices have very little resources having an
  43             // unwinder is too onerous so we default to "abort" because the
  44             // "unwind" strategy is very rare.
  45             panic_strategy: PanicStrategy::Abort,
  46
  47             // Similarly, one almost always never wants to use relocatable
  48             // code because of the extra costs it involves.
  49             relocation_model: "static".to_string(),
  50
  51             // Right now we invoke an external assembler and this isn't
  52             // compatible with multiple codegen units, and plus we probably
  53             // don't want to invoke that many gcc instances.
  54             default_codegen_units: Some(1),
  55
  56             .. Default::default( )
  57         }
  58     })
  59 }