feat: add thumbv7em-none-eabihf for cortex-m floating point processors (

#625)

.devcontainer/rust/Dockerfile

@@ -28,7 +28,8 @@ ENV CARGO_HOME=/usr/local/cargo \
 RUN rustup set profile minimal \
  && rustup default ${RUST_VERSION} \
  && rustup component add clippy llvm-tools rustfmt \
- && rustup target add thumbv7em-none-eabi
+ && rustup target add thumbv7em-none-eabi \
+ && rustup target add thumbv7em-none-eabihf
 
 # Install bats
 RUN batstmp="$(mktemp -d /tmp/bats-core-${BATS_VERSION}.XXXX)" \

.devcontainer/rust/test/cortex-mf/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "thumbv7em-none-eabihf"

.devcontainer/rust/test/cortex-mf/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "hello-cortex"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+cortex-m = "0.6.0"
+cortex-m-rt = "0.6.10"
+panic-halt = "0.2.0"

.devcontainer/rust/test/cortex-mf/src/main.rs

@@ -0,0 +1,15 @@
+#![no_std]
+#![no_main]
+
+use panic_halt as _;
+
+use cortex_m::asm;
+use cortex_m_rt::entry;
+
+#[entry]
+fn main() -> ! {
+    asm::nop();
+
+    loop {
+    }
+}

.devcontainer/rust/test/testsuite.bats

@@ -32,6 +32,19 @@ teardown() {
   popd
 }
 
+@test "valid code input should result in working elf executable targeting the cortex-mf architecture" {
+  pushd cortex-mf
+
+  cargo build
+
+  run cargo readobj --bin hello-cortex -- --file-headers
+  assert_output --partial "Class:                             ELF32"
+  assert_output --partial "Type:                              EXEC"
+  assert_output --partial "Machine:                           ARM"
+
+  popd
+}
+
 @test "using cargo run should result in working executable" {
   pushd cargo