Add EbreakTest. (#380)

* Add EbreakTest.

Confirm correct behavior when somebody bakes an ebreak instruction into
their code.

* Forgot to commit ebreak.c

1 files changed, 31 insertions, 0 deletions

diff --git a/debug/programs/ebreak.c b/debug/programs/ebreak.c
new file mode 100644
index 0000000..466c4e7
--- /dev/null
+++ b/debug/programs/ebreak.c
@@ -0,0 +1,31 @@
+#include <stdint.h>
+
+void ebreak()
+{
+    asm volatile("ebreak");
+}
+
+unsigned int fib(unsigned int n)
+{
+    if (n == 0) {
+        return 0;
+    }
+
+    unsigned int a = 0;
+    unsigned int b = 1;
+
+    for (unsigned int i = 1; i < n; i++) {
+        unsigned int next = a + b;
+        a = b;
+        b = next;
+        ebreak();
+    }
+
+    return b;
+}
+
+int main()
+{
+begin:
+    fib(4);
+}