add thumbv8m baseline support

Author: evq

assemble.sh

@@ -22,6 +22,9 @@ arm-none-eabi-as -march=armv7e-m asm-cm7-r0p1.s -o bin/$crate-cm7-r0p1.o
 ar crs bin/thumbv7em-none-eabi.a bin/$crate.o bin/$crate-v7.o bin/$crate-cm7-r0p1.o
 ar crs bin/thumbv7em-none-eabihf.a bin/$crate.o bin/$crate-v7.o bin/$crate-cm7-r0p1.o
 
+arm-none-eabi-as -march=armv8-m.base asm.s -o bin/$crate.o
+ar crs bin/thumbv8m.base-none-eabi.a bin/$crate.o
+
 rm bin/$crate.o
 rm bin/$crate-v7.o
 rm bin/$crate-cm7-r0p1.o

bin/thumbv8m.base-none-eabi.a

@@ -26,6 +26,9 @@ fn main() {
         println!("cargo:rustc-cfg=cortex_m");
         println!("cargo:rustc-cfg=armv7m");
         //println!("cargo:rustc-cfg=armv7em");
+    } else if target.starts_with("thumbv8m") {
+        println!("cargo:rustc-cfg=cortex_m");
+        println!("cargo:rustc-cfg=armv8m");
     }
 
     if target.ends_with("-eabihf") {