add static exception handling

link.x

@@ -1,6 +1,14 @@
 ENTRY(_boot_cores);
 
 STACK_SIZE = 0x2000 - 0x10;
+PROVIDE(Reset = _boot_cores);
+PROVIDE(UndefinedInstruction = Reset);
+PROVIDE(SoftwareInterrupt = Reset);
+PROVIDE(PrefetchAbort = Reset);
+PROVIDE(DataAbort = Reset);
+PROVIDE(ReservedException = Reset);
+PROVIDE(IRQ = Reset);
+PROVIDE(FIQ = Reset);
 
 MEMORY
 {
@@ -10,9 +18,13 @@ MEMORY
 
 SECTIONS
 {
+    .exceptions :
+    {
+        . = 0x0;
+        KEEP(*(.text.exceptions));
+    } > OCM
     .text :
     {
-        /* Starts at LOADER_ADDR. */
         . = 0x8000;
         KEEP(*(.text.boot))
         *(.text .text.*)

src/cortex_a9/exceptions.s

@@ -0,0 +1,12 @@
+.section ".text.exceptions"
+.global exception_vector
+
+exception_vector:
+    b Reset
+    b UndefinedInstruction
+    b SoftwareInterrupt
+    b PrefetchAbort
+    b DataAbort
+    b ReservedException
+    b IRQ
+    b FIQ

src/cortex_a9/mod.rs

@@ -1,2 +1,4 @@
 pub mod asm;
 pub mod regs;
+
+global_asm!(include_str!("exceptions.s"));

src/main.rs

@@ -1,6 +1,7 @@
 #![no_std]
 #![no_main]
 #![feature(asm)]
+#![feature(global_asm)]
 #![feature(naked_functions)]
 
 use core::fmt::Write;
@@ -94,3 +95,13 @@ fn panic(info: &core::panic::PanicInfo) -> ! {
     slcr::RegisterBlock::unlocked(|slcr| slcr.soft_reset());
     unreachable!()
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn PrefetchAbort() {
+    panic!("PrefetchAbort");
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn DataAbort() {
+    panic!("DataAbort");
+}