From dd74e936ed69c7267ebb3f6d58634bd68cf7f642 Mon Sep 17 00:00:00 2001
From: Arisotura <thetotalworm@gmail.com>
Date: Sat, 22 Oct 2022 13:11:57 +0200
Subject: [PATCH] force-align all read/write accesses. fixes #1540 (unaligned
 DMA address)

---
 src/DSi.cpp | 16 ++++++++++++++++
 src/NDS.cpp | 18 +++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/DSi.cpp b/src/DSi.cpp
index a4379dd4..59d1c05d 100644
--- a/src/DSi.cpp
+++ b/src/DSi.cpp
@@ -1283,6 +1283,8 @@ u8 ARM9Read8(u32 addr)
 
 u16 ARM9Read16(u32 addr)
 {
+    addr &= ~0x1;
+
     if ((addr >= 0xFFFF0000) && (!(SCFG_BIOS & (1<<1))))
     {
         if ((addr >= 0xFFFF8000) && (SCFG_BIOS & (1<<0)))
@@ -1331,6 +1333,8 @@ u16 ARM9Read16(u32 addr)
 
 u32 ARM9Read32(u32 addr)
 {
+    addr &= ~0x3;
+
     if ((addr >= 0xFFFF0000) && (!(SCFG_BIOS & (1<<1))))
     {
         if ((addr >= 0xFFFF8000) && (SCFG_BIOS & (1<<0)))
@@ -1488,6 +1492,8 @@ void ARM9Write8(u32 addr, u8 val)
 
 void ARM9Write16(u32 addr, u16 val)
 {
+    addr &= ~0x1;
+
     switch (addr & 0xFF000000)
     {
     case 0x03000000:
@@ -1578,6 +1584,8 @@ void ARM9Write16(u32 addr, u16 val)
 
 void ARM9Write32(u32 addr, u32 val)
 {
+    addr &= ~0x3;
+
     switch (addr & 0xFF000000)
     {
     case 0x03000000:
@@ -1763,6 +1771,8 @@ u8 ARM7Read8(u32 addr)
 
 u16 ARM7Read16(u32 addr)
 {
+    addr &= ~0x1;
+
     if ((addr < 0x00010000) && (!(SCFG_BIOS & (1<<9))))
     {
         if ((addr >= 0x00008000) && (SCFG_BIOS & (1<<8)))
@@ -1820,6 +1830,8 @@ u16 ARM7Read16(u32 addr)
 
 u32 ARM7Read32(u32 addr)
 {
+    addr &= ~0x3;
+
     if ((addr < 0x00010000) && (!(SCFG_BIOS & (1<<9))))
     {
         if ((addr >= 0x00008000) && (SCFG_BIOS & (1<<8)))
@@ -1972,6 +1984,8 @@ void ARM7Write8(u32 addr, u8 val)
 
 void ARM7Write16(u32 addr, u16 val)
 {
+    addr &= ~0x1;
+
     switch (addr & 0xFF800000)
     {
     case 0x03000000:
@@ -2067,6 +2081,8 @@ void ARM7Write16(u32 addr, u16 val)
 
 void ARM7Write32(u32 addr, u32 val)
 {
+    addr &= ~0x3;
+
     switch (addr & 0xFF800000)
     {
     case 0x03000000:
diff --git a/src/NDS.cpp b/src/NDS.cpp
index 966b2529..60f77310 100644
--- a/src/NDS.cpp
+++ b/src/NDS.cpp
@@ -1995,7 +1995,7 @@ void debug(u32 param)
     //    printf("VRAM %c: %02X\n", 'A'+i, GPU::VRAMCNT[i]);
 
     FILE*
-    shit = fopen("debug/inazuma.bin", "wb");
+    shit = fopen("debug/crayon.bin", "wb");
     fwrite(ARM9->ITCM, 0x8000, 1, shit);
     for (u32 i = 0x02000000; i < 0x02400000; i+=4)
     {
@@ -2093,6 +2093,8 @@ u8 ARM9Read8(u32 addr)
 
 u16 ARM9Read16(u32 addr)
 {
+    addr &= ~0x1;
+
     if ((addr & 0xFFFFF000) == 0xFFFF0000)
     {
         return *(u16*)&ARM9BIOS[addr & 0xFFF];
@@ -2151,6 +2153,8 @@ u16 ARM9Read16(u32 addr)
 
 u32 ARM9Read32(u32 addr)
 {
+    addr &= ~0x3;
+
     if ((addr & 0xFFFFF000) == 0xFFFF0000)
     {
         return *(u32*)&ARM9BIOS[addr & 0xFFF];
@@ -2255,6 +2259,8 @@ void ARM9Write8(u32 addr, u8 val)
 
 void ARM9Write16(u32 addr, u16 val)
 {
+    addr &= ~0x1;
+
     switch (addr & 0xFF000000)
     {
     case 0x02000000:
@@ -2319,6 +2325,8 @@ void ARM9Write16(u32 addr, u16 val)
 
 void ARM9Write32(u32 addr, u32 val)
 {
+    addr &= ~0x3;
+
     switch (addr & 0xFF000000)
     {
     case 0x02000000:
@@ -2484,6 +2492,8 @@ u8 ARM7Read8(u32 addr)
 
 u16 ARM7Read16(u32 addr)
 {
+    addr &= ~0x1;
+
     if (addr < 0x00004000)
     {
         if (ARM7->R[15] >= 0x00004000)
@@ -2548,6 +2558,8 @@ u16 ARM7Read16(u32 addr)
 
 u32 ARM7Read32(u32 addr)
 {
+    addr &= ~0x3;
+
     if (addr < 0x00004000)
     {
         if (ARM7->R[15] >= 0x00004000)
@@ -2682,6 +2694,8 @@ void ARM7Write8(u32 addr, u8 val)
 
 void ARM7Write16(u32 addr, u16 val)
 {
+    addr &= ~0x1;
+
     switch (addr & 0xFF800000)
     {
     case 0x02000000:
@@ -2760,6 +2774,8 @@ void ARM7Write16(u32 addr, u16 val)
 
 void ARM7Write32(u32 addr, u32 val)
 {
+    addr &= ~0x3;
+
     switch (addr & 0xFF800000)
     {
     case 0x02000000: