rustc_target/spec/targets/
thumbv7em_none_eabi.rs

1// Targets the Cortex-M4 and Cortex-M7 processors (ARMv7E-M)
2//
3// This target assumes that the device doesn't have a FPU (Floating Point Unit) and lowers all the
4// floating point operations to software routines (intrinsics).
5//
6// As such, this target uses the "soft" calling convention (ABI) where floating point values are
7// passed to/from subroutines via general purpose registers (R0, R1, etc.).
8//
9// To opt-in to hardware accelerated floating point operations, you can use, for example,
10// `-C target-feature=+vfp4` or `-C target-cpu=cortex-m4`.
11
12use crate::spec::{FloatAbi, Target, TargetOptions, base};
13
14pub(crate) fn target() -> Target {
15    Target {
16        llvm_target: "thumbv7em-none-eabi".into(),
17        metadata: crate::spec::TargetMetadata {
18            description: Some("Bare ARMv7E-M".into()),
19            tier: Some(2),
20            host_tools: Some(false),
21            std: Some(false),
22        },
23        pointer_width: 32,
24        data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
25        arch: "arm".into(),
26
27        options: TargetOptions {
28            abi: "eabi".into(),
29            llvm_floatabi: Some(FloatAbi::Soft),
30            max_atomic_width: Some(32),
31            ..base::thumb::opts()
32        },
33    }
34}