From df62e1901ef75fb4fbebcb9833e1fe129b640f60 Mon Sep 17 00:00:00 2001
From: TuxSH <1922548+TuxSH@users.noreply.github.com>
Date: Sat, 21 Nov 2020 21:45:36 +0000
Subject: [PATCH 1/2] arm9: mark drawFormattedString as printf-like function

---
 arm9/source/draw.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arm9/source/draw.h b/arm9/source/draw.h
index f1f966ddb..16d734d6d 100644
--- a/arm9/source/draw.h
+++ b/arm9/source/draw.h
@@ -47,4 +47,6 @@
 bool loadSplash(void);
 void drawCharacter(bool isTopScreen, u32 posX, u32 posY, u32 color, char character);
 u32 drawString(bool isTopScreen, u32 posX, u32 posY, u32 color, const char *string);
+
+__attribute__((format(printf,5,6)))
 u32 drawFormattedString(bool isTopScreen, u32 posX, u32 posY, u32 color, const char *fmt, ...);

From 87fa35ccfda58418f7d613a177071a9d920e2cc2 Mon Sep 17 00:00:00 2001
From: TuxSH <1922548+TuxSH@users.noreply.github.com>
Date: Sun, 22 Nov 2020 00:00:12 +0000
Subject: [PATCH 2/2] arm9 exception handlers: add arm9 mem dumping feature

---
 arm9/source/arm9_exception_handlers.c         | 31 ++++++++++++++++++-
 arm9/source/exceptions.c                      | 11 +++++--
 .../source/fatalExceptionHandlersMain.c       |  2 +-
 3 files changed, 40 insertions(+), 4 deletions(-)

diff --git a/arm9/source/arm9_exception_handlers.c b/arm9/source/arm9_exception_handlers.c
index 0adf3378e..d7fbed38a 100644
--- a/arm9/source/arm9_exception_handlers.c
+++ b/arm9/source/arm9_exception_handlers.c
@@ -33,6 +33,16 @@
 #define REG_DUMP_SIZE   4 * 17
 #define CODE_DUMP_SIZE  48
 
+static inline void dumpArm9Memory(ExceptionDumpHeader *dumpHeader, u8 *buf)
+{
+    // Check if n3ds extra arm9 mem is enabled (if it's possible to read CFG9_EXTMEMCNT9)
+    u8 extmemcnt9 = 0;
+    safecpy(&extmemcnt9, (const void *)0x10000200, 1);
+
+    u32 size = (extmemcnt9 & 1) ? 0x180000 : 0x100000;
+    dumpHeader->additionalDataSize += safecpy(buf, (const void *)0x08000000, size);
+}
+
 void __attribute__((noreturn)) arm9ExceptionHandlerMain(u32 *registerDump, u32 type)
 {
     ExceptionDumpHeader dumpHeader;
@@ -42,7 +52,7 @@ void __attribute__((noreturn)) arm9ExceptionHandlerMain(u32 *registerDump, u32 t
     dumpHeader.magic[0] = 0xDEADC0DE;
     dumpHeader.magic[1] = 0xDEADCAFE;
     dumpHeader.versionMajor = 1;
-    dumpHeader.versionMinor = 2;
+    dumpHeader.versionMinor = 3;
 
     dumpHeader.processor = 9;
     dumpHeader.core = 0;
@@ -68,6 +78,25 @@ void __attribute__((noreturn)) arm9ExceptionHandlerMain(u32 *registerDump, u32 t
 
     //Dump stack in place
     dumpHeader.stackDumpSize = safecpy(final, (const void *)registerDump[13], 0x1000 - (registerDump[13] & 0xFFF));
+    final += dumpHeader.stackDumpSize;
+
+    // See if we need to copy Arm9 memory (check for bkpt 0xFFFD / bkpt 0xFD)
+    if(dumpHeader.codeDumpSize > 0)
+    {
+        if(cpsr & 0x20)
+        {
+            // Thumb
+            u16 instr;
+            safecpy(&instr, codeDump + dumpHeader.codeDumpSize - 2, 2);
+            if(instr == 0xBEFD) dumpArm9Memory(&dumpHeader, final);
+        }
+        else
+        {
+            u32 instr;
+            safecpy(&instr, codeDump + dumpHeader.codeDumpSize - 4, 4);
+            if(instr == 0xE12FFF7D) dumpArm9Memory(&dumpHeader, final);
+        }
+    }
 
     dumpHeader.totalSize = sizeof(ExceptionDumpHeader) + dumpHeader.registerDumpSize + dumpHeader.codeDumpSize + dumpHeader.stackDumpSize + dumpHeader.additionalDataSize;
 
diff --git a/arm9/source/exceptions.c b/arm9/source/exceptions.c
index e21bb038d..07106840e 100644
--- a/arm9/source/exceptions.c
+++ b/arm9/source/exceptions.c
@@ -129,8 +129,15 @@ void detectAndProcessExceptionDumps(void)
     }
 
     if(dumpHeader->additionalDataSize != 0)
-        posY = drawFormattedString(true, 10, posY + SPACING_Y, COLOR_WHITE,
-                                   "Current process: %.8s (%016llX)", (const char *)additionalData, *(vu64 *)(additionalData + 8));
+    {
+        u32 size = dumpHeader->additionalDataSize;
+        if(dumpHeader->processor == 11)
+            posY = drawFormattedString(true, 10, posY + SPACING_Y, COLOR_WHITE,
+                                    "Current process: %.8s (%016llX)", (const char *)additionalData, *(vu64 *)(additionalData + 8));
+        else
+            posY = drawFormattedString(true, 10, posY + SPACING_Y, COLOR_WHITE,
+                                    "Arm9 memory dump at offset %X size %lX", (uintptr_t)additionalData - (uintptr_t)dumpHeader, size);
+    }
     posY += SPACING_Y;
 
     for(u32 i = 0; i < 17; i += 2)
diff --git a/k11_extension/source/fatalExceptionHandlersMain.c b/k11_extension/source/fatalExceptionHandlersMain.c
index cbdecc5ec..09a273252 100644
--- a/k11_extension/source/fatalExceptionHandlersMain.c
+++ b/k11_extension/source/fatalExceptionHandlersMain.c
@@ -81,7 +81,7 @@ void fatalExceptionHandlersMain(u32 *registerDump, u32 type, u32 cpuId)
     dumpHeader.magic[0] = 0xDEADC0DE;
     dumpHeader.magic[1] = 0xDEADCAFE;
     dumpHeader.versionMajor = 1;
-    dumpHeader.versionMinor = 2;
+    dumpHeader.versionMinor = 3;
 
     dumpHeader.processor = 11;
     dumpHeader.core = cpuId & 0xF;