make this crate compile further for HOST

2 files changed, 21 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bb5286..a39c5bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Changed
+
+- Small, non user visible change to make this crate compile further for $HOST (e.g. x86_64) with the
+  goal of making it possible to test, on the HOST, downstream crates that depend on this one.
+
 ## [v0.1.0] - 2016-09-27
 
 ### Added
diff --git a/src/asm.rs b/src/asm.rs
index 3337626..1de0d32 100644
--- a/src/asm.rs
+++ b/src/asm.rs
@@ -4,6 +4,7 @@
 ///
 /// Optionally, an "immediate" value (in the 0-255 range) can be passed to `bkpt!`. The debugger can
 /// then read this value using the Program Counter (PC).
+#[cfg(target_arch = "arm")]
 #[macro_export]
 macro_rules! bkpt {
     () => {
@@ -14,6 +15,21 @@ macro_rules! bkpt {
     };
 }
 
+/// Puts the processor in Debug state. Debuggers can pick this up as a "breakpoint".
+///
+/// Optionally, an "immediate" value (in the 0-255 range) can be passed to `bkpt!`. The debugger can
+/// then read this value using the Program Counter (PC).
+#[cfg(not(target_arch = "arm"))]
+#[macro_export]
+macro_rules! bkpt {
+    () => {
+        asm!("nop" :::: "volatile");
+    };
+    ($e:expr) => {
+        asm!("nop" :::: "volatile");
+    };
+}
+
 /// Wait for event
 pub unsafe fn wfe() {
     match () {