src/librustc_back/target/thumbv7em_none_eabi.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 // Targets the Cortex-M4 and Cortex-M7 processors (ARMv7E-M)
  12 //
  13 // This target assumes that the device doesn't have a FPU (Floating Point Unit) and lowers all the
  14 // floating point operations to software routines (intrinsics).
  15 //
  16 // As such, this target uses the "soft" calling convention (ABI) where floating point values are
  17 // passed to/from subroutines via general purpose registers (R0, R1, etc.).
  18 //
  19 // To opt-in to hardware accelerated floating point operations, you can use, for example,
  20 // `-C target-feature=+vfp4` or `-C target-cpu=cortex-m4`.
  21
  22 use LinkerFlavor;
  23 use target::{Target, TargetOptions, TargetResult};
  24
  25 pub fn target() -> TargetResult {
  26     Ok(Target {
  27         llvm_target: "thumbv7em-none-eabi".to_string(),
  28         target_endian: "little".to_string(),
  29         target_pointer_width: "32".to_string(),
  30         data_layout: "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
  31         arch: "arm".to_string(),
  32         target_os: "none".to_string(),
  33         target_env: "".to_string(),
  34         target_vendor: "".to_string(),
  35         linker_flavor: LinkerFlavor::Gcc,
  36
  37         options: TargetOptions {
  38             max_atomic_width: Some(32),
  39             .. super::thumb_base::opts()
  40         },
  41     })
  42 }