add CI, add device specific check of the vector table size, ..

- document the `main` symbol as an alternative to `entry!`
- document `ResetTrampoline`
- fix: `PendSV` is available on ARMv6-M
- document that `entry!` and `exception!` must be called from accessible modules.
- add a deny lint to `entry!` and `exception!` to prevent them from being invoked from inaccessible
  modules.

1 files changed, 50 insertions, 0 deletions

diff --git a/cortex-m-rt/examples/device.rs b/cortex-m-rt/examples/device.rs
new file mode 100644
index 0000000..cf91f21
--- /dev/null
+++ b/cortex-m-rt/examples/device.rs
@@ -0,0 +1,50 @@
+//! Manually create the interrupts portion of the vector table
+
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+#[macro_use(entry, exception)]
+extern crate cortex_m_rt as rt;
+extern crate panic_semihosting;
+
+use rt::ExceptionFrame;
+
+// the program entry point
+entry!(main);
+
+fn main() -> ! {
+    loop {}
+}
+
+// the hard fault handler
+exception!(HardFault, hard_fault);
+
+fn hard_fault(_ef: &ExceptionFrame) -> ! {
+    loop {}
+}
+
+// the default exception handler
+exception!(*, default_handler);
+
+fn default_handler(_irqn: i16) {}
+
+// interrupts portion of the vector table
+pub union Vector {
+    handler: unsafe extern "C" fn(),
+    reserved: usize,
+}
+
+extern "C" {
+    fn WWDG();
+    fn PVD();
+}
+
+#[link_section = ".vector_table.interrupts"]
+#[no_mangle]
+pub static __INTERRUPTS: [Vector; 3] = [
+    Vector { handler: WWDG },
+    Vector { reserved: 0 },
+    Vector { handler: PVD },
+];