From 93bf62580a68533dc8252b9a2a055c02f34ecb67 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 24 Mar 2022 09:38:08 -0700
Subject: Modularized

---
 kernel/exceptions/undefined.S | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 kernel/exceptions/undefined.S

(limited to 'kernel/exceptions/undefined.S')

diff --git a/kernel/exceptions/undefined.S b/kernel/exceptions/undefined.S
new file mode 100644
index 0000000..856e30f
--- /dev/null
+++ b/kernel/exceptions/undefined.S
@@ -0,0 +1,21 @@
+.section ".text.exceptions"
+.globl undefined
+undefined:
+	cpsid aif
+	stmfd sp!, {r0-r12,lr}
+	ldr r4, [lr, #-4]
+	mov r0, #62
+	mov r1, #0
+	mov r2, r4
+	bl draw_hex32
+	// Output lr
+	ldr r0, [sp, #0x34]
+	sub r2, r0, #4
+	mov r0, #62
+	mov r1, #1
+	bl draw_hex32
+	// Skip instruction for now
+	// In future, 
+	//  ldmfd sp!, {r0-r12,lr} // Note the lack of ^ since subs will handle it
+	//  subs pc, lr, #4
+	ldmfd sp!, {r0-r12,pc}^
-- 
cgit v1.2.1