stub exceptions by default, drop .init_array support

Cargo.toml

@@ -8,7 +8,7 @@ r0 = "0.2.1"
 
 [dependencies.cortex-m]
 optional = true
-version = "0.2.0"
+version = "0.2.2"
 
 [dependencies.cortex-m-semihosting]
 optional = true
@@ -19,6 +19,9 @@ features = ["mem"]
 git = "https://github.com/rust-lang-nursery/compiler-builtins"
 
 [features]
+default = ["exceptions"]
+# handle exceptions using the default handler
+exceptions = ["cortex-m"]
 linker-script = []
 panic-over-itm = ["cortex-m"]
 panic-over-semihosting = ["cortex-m-semihosting"]

link.x

@@ -9,10 +9,10 @@ SECTIONS
     LONG(ORIGIN(RAM) + LENGTH(RAM));
 
     KEEP(*(.rodata.reset_handler));
-    KEEP(*(.rodata._EXCEPTIONS));
+    KEEP(*(.rodata.exceptions));
     __exceptions = .;
 
-    KEEP(*(.rodata._INTERRUPTS));
+    KEEP(*(.rodata.interrupts));
     __interrupts = .;
 
     *(.text.*);

src/lib.rs

@@ -34,8 +34,8 @@
 #![feature(used)]
 #![no_std]
 
-#[cfg(feature = "panic-over-itm")]
-#[macro_use]
+#[cfg(any(feature = "panic-over-itm", feature = "exceptions"))]
+#[cfg_attr(feature = "panic-over-itm", macro_use)]
 extern crate cortex_m;
 extern crate compiler_builtins;
 #[cfg(feature = "panic-over-semihosting")]
@@ -45,6 +45,9 @@ extern crate r0;
 
 mod lang_items;
 
+#[cfg(feature = "exceptions")]
+use cortex_m::exception;
+
 /// The reset handler
 ///
 /// This is the entry point of all programs
@@ -57,14 +60,10 @@ unsafe extern "C" fn reset_handler() -> ! {
         static mut _sdata: u32;
 
         static _sidata: u32;
-
-        static _init_array_start: extern "C" fn();
-        static _init_array_end: extern "C" fn();
     }
 
     ::r0::zero_bss(&mut _sbss, &mut _ebss);
     ::r0::init_data(&mut _sdata, &mut _edata, &_sidata);
-    ::r0::run_init_array(&_init_array_start, &_init_array_end);
 
     // NOTE `rustc` forces this signature on us. See `src/lang_items.rs`
     extern "C" {
@@ -86,3 +85,11 @@ unsafe extern "C" fn reset_handler() -> ! {
 #[used]
 #[link_section = ".rodata.reset_handler"]
 static RESET_HANDLER: unsafe extern "C" fn() -> ! = reset_handler;
+
+#[allow(dead_code)]
+#[cfg(feature = "exceptions")]
+#[link_section = ".rodata.exceptions"]
+#[used]
+static EXCEPTIONS: exception::Handlers = exception::Handlers {
+    ..exception::DEFAULT_HANDLERS
+};