1 files changed, 154 insertions, 0 deletions
diff --git a/arm9/asm/OS_exception.s b/arm9/asm/OS_exception.s
new file mode 100644
index 00000000..8a078de7
--- /dev/null
+++ b/arm9/asm/OS_exception.s
@@ -0,0 +1,154 @@
+    .include "asm/macros.inc"
+    .include "global.inc"
+
+    .text
+
+	arm_func_start OSi_ExceptionHandler
+OSi_ExceptionHandler: ; 0x020CC9FC
+	ldr ip, _020CCA68 ; =OSi_DebuggerHandler
+	ldr r12, [r12, #0x0]
+	cmp r12, #0x0
+	movne lr, pc
+	bxne r12
+	ldr ip, _020CCA6C ; =0x02000000
+	stmdb r12!, {r0-r3,sp-lr}
+	and r0, sp, #0x1
+	mov sp, r12
+	mrs r1, cpsr
+	and r1, r1, #0x1f
+	teq r1, #0x17
+	bne _020CCA38
+	bl OSi_GetAndDisplayContext
+	b _020CCA44
+_020CCA38:
+	teq r1, #0x1b
+	bne _020CCA44
+	bl OSi_GetAndDisplayContext
+_020CCA44:
+	ldr ip, _020CCA68 ; =OSi_DebuggerHandler
+	ldr r12, [r12, #0x0]
+	cmp r12, #0x0
+_020CCA50:
+	beq _020CCA50
+_020CCA54:
+	mov r0, r0
+	b _020CCA54
+_020CCA5C:
+	ldmia sp!, {r0-r3,ip,lr}
+	mov sp, ip
+	bx lr
+_020CCA68: .word OSi_DebuggerHandler
+_020CCA6C: .word 0x02000000
+
+	arm_func_start OSi_GetAndDisplayContext
+OSi_GetAndDisplayContext: ; 0x020CCA70
+	stmdb sp!, {r0,lr}
+	bl OSi_SetExContext
+	bl OSi_DisplayExContext
+	ldmia sp!, {r0,lr}
+	bx lr
+
+	arm_func_start OSi_SetExContext
+OSi_SetExContext: ; 0x020CCA84
+	ldr r1, _020CCB10 ; =OSi_ExContext
+	mrs r2, cpsr
+	str r2, [r1, #0x74]
+	str r0, [r1, #0x6c]
+	ldr r0, [r12, #0x0]
+	str r0, [r1, #0x4]
+	ldr r0, [r12, #0x4]
+	str r0, [r1, #0x8]
+	ldr r0, [r12, #0x8]
+	str r0, [r1, #0xc]
+	ldr r0, [r12, #0xc]
+	str r0, [r1, #0x10]
+	ldr r2, [r12, #0x10]
+	bic r2, r2, #0x1
+	add r0, r1, #0x14
+	stmia r0, {r4-r11}
+	str r12, [r1, #0x70]
+	ldr r0, [r2, #0x0]
+	str r0, [r1, #0x64]
+	ldr r3, [r2, #0x4]
+	str r3, [r1, #0x0]
+	ldr r0, [r2, #0x8]
+	str r0, [r1, #0x34]
+	ldr r0, [r2, #0xc]
+	str r0, [r1, #0x40]
+	mrs r0, cpsr
+	orr r3, r3, #0x80
+	bic r3, r3, #0x20
+	msr cpsr_fsxc, r3
+	str sp, [r1, #0x38]
+	str lr, [r1, #0x3c]
+	mrs r2, spsr
+	str r2, [r1, #0x7c]
+	msr cpsr_fsxc, r0
+	bx lr
+	.balign 4
+_020CCB10: .word OSi_ExContext
+
+	arm_func_start OSi_DisplayExContext
+OSi_DisplayExContext: ; 0x020CCB14
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	ldr r0, _020CCB70 ; =OSi_UserExceptionHandler
+	ldr r0, [r0, #0x0]
+	cmp r0, #0x0
+	addeq sp, sp, #0x4
+	ldmeqia sp!, {lr}
+	bxeq lr
+	mov r0, sp
+	ldr r1, _020CCB74 ; =0x0000009F
+	msr cpsr_fsxc, r1
+	mov sp, r0
+	bl OS_EnableProtectionUnit
+	ldr r1, _020CCB78 ; =OSi_UserExceptionHandlerArg
+	ldr r0, _020CCB70 ; =OSi_UserExceptionHandler
+	ldr r1, [r1, #0x0]
+	ldr r2, [r0, #0x0]
+	ldr r0, _020CCB7C ; =OSi_ExContext
+	blx r2
+	bl OS_DisableProtectionUnit
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+	.balign 4
+_020CCB70: .word OSi_UserExceptionHandler
+_020CCB74: .word 0x0000009F
+_020CCB78: .word OSi_UserExceptionHandlerArg
+_020CCB7C: .word OSi_ExContext
+
+	arm_func_start OS_InitException
+OS_InitException: ; 0x020CCB80
+	ldr r0, _020CCBDC ; =0x027FFD9C
+	ldr r1, [r0, #0x0]
+	cmp r1, #0x2600000
+	blo _020CCBA0
+	cmp r1, #0x2800000
+	ldrlo r0, _020CCBE0 ; =OSi_DebuggerHandler
+	strcc r1, [r0, #0x0]
+	blo _020CCBAC
+_020CCBA0:
+	ldr r0, _020CCBE0 ; =OSi_DebuggerHandler
+	mov r1, #0x0
+	str r1, [r0, #0x0]
+_020CCBAC:
+	ldr r0, _020CCBE0 ; =OSi_DebuggerHandler
+	ldr r0, [r0, #0x0]
+	cmp r0, #0x0
+	ldreq r2, _020CCBE4 ; =OSi_ExceptionHandler
+	ldreq r1, _020CCBDC ; =0x027FFD9C
+	ldreq r0, _020CCBE8 ; =0x027E3000
+	streq r2, [r1, #0x0]
+	streq r2, [r0, #0xfdc]
+	ldr r0, _020CCBEC ; =OSi_UserExceptionHandler
+	mov r1, #0x0
+	str r1, [r0, #0x0]
+	bx lr
+	.balign 4
+_020CCBDC: .word 0x027FFD9C
+_020CCBE0: .word OSi_DebuggerHandler
+_020CCBE4: .word OSi_ExceptionHandler
+_020CCBE8: .word 0x027E3000
+_020CCBEC: .word OSi_UserExceptionHandler