diff --git a/source/arm9/console.c b/source/arm9/console.c
index 3deaed8..e1343d8 100644
--- a/source/arm9/console.c
+++ b/source/arm9/console.c
@@ -232,6 +232,8 @@
 
 		chr = *(tmp++);
 		i++; count++;
+		
+		if((u32) tmp > 0x8100000) panic();	// ptr poisoned.
 
 		if ( chr == 0x1b && *tmp == '[' ) {
 			bool escaping = true;
@@ -243,6 +245,9 @@
 				chr = *(tmp++);
 				i++; count++; escapelen++;
 				int parameter, assigned, consumed;
+				
+				if((u32) tmp > 0x8100000) panic();	// ptr poisoned.
+				if((u32) escapeseq > 0x8100000) panic();	// ptr poisoned.
 
 				// make sure parameters are positive values and delimited by semicolon
 				if((chr >= '0' && chr <= '9') || chr == ';')
@@ -374,9 +379,12 @@
 							parameter = 0;
 							if (escapelen == 1) {
 								consumed = 1;
-							} else if (strchr(escapeseq,';')) {
-								sscanf(escapeseq,"%d;%n", &parameter, &consumed);
 							} else {
+								if((u32) escapeseq > 0x8100000) panic();	// ptr poisoned.
+								if (strchr(escapeseq,';')) {
+									sscanf(escapeseq,"%d;%n", &parameter, &consumed);
+								}
+							 else 
 								sscanf(escapeseq,"%dm%n", &parameter, &consumed);
 							}
 
diff --git a/source/arm9/debug.c b/source/arm9/debug.c
index e50d211..5a8eb82 100644
--- a/source/arm9/debug.c
+++ b/source/arm9/debug.c
@@ -4,11 +4,26 @@
 #include "mem_map.h"
 #include "console.h"
 
+static bool exceptionTriggered = false;
+
+static u32 debugHash = 0;
+
 void NORETURN guruMeditation(u8 type, u32 *excStack, u32 *stackPointer)
 {
 	const char *typeStr[3] = {"Undefined instruction", "Prefetch abort", "Data abort"};
 	u32 realPc, instSize = 4;
+	bool codeChanged = false;
 
+	if(exceptionTriggered)	// inception :(
+		while(1);
+	
+	exceptionTriggered = true;
+	
+	// verify text and rodata
+	u32 prevHash = debugHash;
+	hashCodeRoData();
+	if(prevHash != debugHash)
+		codeChanged = true;
 
 	consoleInit(0, NULL);
 
@@ -44,6 +59,8 @@
 			stackPointer += 2;
 		}
 	}
+	
+	if(codeChanged) printf("Attention: RO section data changed!!");
 
 	// avoid fs corruptions
 	unmount_fs();
@@ -54,6 +71,8 @@
 
 void NORETURN panic()
 {
+	consoleInit(0, NULL);
+
 	printf("\x1b[41m\x1b[0J\x1b[9CGPANIC!!!\n");
 	
 	unmount_fs();
@@ -62,3 +81,16 @@
 	while(1);
 }
 
+void hashCodeRoData()
+{
+	extern u32 *__text_start;
+	extern u32 *__exidx_start;
+	
+	u32 *start = __text_start;
+	u32 *end = __exidx_start;
+	
+	debugHash = 0;
+	
+	for(u32 *ptr = start; ptr < end; ptr++)
+		debugHash += *ptr;
+}