From 3dd777be70fabcfbba191750b56bf4ca340407f5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9o=20Lam?= <leo@innovatetechnologi.es>
Date: Wed, 6 Dec 2017 21:14:59 +0100
Subject: [PATCH] Boot: Add default exception handlers

Some homebrew expect exception handlers to be present -- which is
almost always the case on console, since most of the time homebrew are
launched from either a libogc or SDK title) -- and break if they are
not. To fix this, we just need to include default, dummy handlers.
---
 Source/Core/Core/Boot/Boot.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Source/Core/Core/Boot/Boot.cpp b/Source/Core/Core/Boot/Boot.cpp
index 96baaa9e05..981cebc550 100644
--- a/Source/Core/Core/Boot/Boot.cpp
+++ b/Source/Core/Core/Boot/Boot.cpp
@@ -282,6 +282,18 @@ static void SetDefaultDisc()
     SetDisc(DiscIO::CreateVolumeFromFilename(config.m_strDefaultISO));
 }
 
+static void CopyDefaultExceptionHandlers()
+{
+  constexpr u32 EXCEPTION_HANDLER_ADDRESSES[] = {0x00000100, 0x00000200, 0x00000300, 0x00000400,
+                                                 0x00000500, 0x00000600, 0x00000700, 0x00000800,
+                                                 0x00000900, 0x00000C00, 0x00000D00, 0x00000F00,
+                                                 0x00001300, 0x00001400, 0x00001700};
+
+  constexpr u32 RFI_INSTRUCTION = 0x4C000064;
+  for (const u32 address : EXCEPTION_HANDLER_ADDRESSES)
+    Memory::Write_U32(RFI_INSTRUCTION, address);
+}
+
 // Third boot step after BootManager and Core. See Call schedule in BootManager.cpp
 bool CBoot::BootUp(std::unique_ptr<BootParameters> boot)
 {
@@ -332,6 +344,7 @@ bool CBoot::BootUp(std::unique_ptr<BootParameters> boot)
 
       SetupMSR();
       SetupBAT(config.bWii);
+      CopyDefaultExceptionHandlers();
 
       if (config.bWii)
       {