From 2df74cc0557a30be2f8b00c24190dc18509c0879 Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Thu, 30 May 2019 20:30:19 +0200
Subject: [PATCH] add static exception handling

---
 link.x                     | 14 +++++++++++++-
 src/cortex_a9/exceptions.s | 12 ++++++++++++
 src/cortex_a9/mod.rs       |  2 ++
 src/main.rs                | 11 +++++++++++
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 src/cortex_a9/exceptions.s

diff --git a/link.x b/link.x
index 4f13df0..985013e 100644
--- a/link.x
+++ b/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.*)
diff --git a/src/cortex_a9/exceptions.s b/src/cortex_a9/exceptions.s
new file mode 100644
index 0000000..f53ece2
--- /dev/null
+++ b/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
diff --git a/src/cortex_a9/mod.rs b/src/cortex_a9/mod.rs
index 79d3436..72f65b0 100644
--- a/src/cortex_a9/mod.rs
+++ b/src/cortex_a9/mod.rs
@@ -1,2 +1,4 @@
 pub mod asm;
 pub mod regs;
+
+global_asm!(include_str!("exceptions.s"));
diff --git a/src/main.rs b/src/main.rs
index 5feebbc..6f75915 100644
--- a/src/main.rs
+++ b/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");
+}