From 3112ed67f92d65863d736fafb7d62b0428acb11a Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sun, 30 Aug 2020 17:05:48 +0200
Subject: emul: find illegal address references to opcodes (avoid endless
 loops)

---
 ecomp-c/emul.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/ecomp-c/emul.c b/ecomp-c/emul.c
index c67ca49..e4234f9 100644
--- a/ecomp-c/emul.c
+++ b/ecomp-c/emul.c
@@ -304,6 +304,7 @@ int main( int argc, char *argv[] )
 	
 	uint64_t address = CODE_START;
 	bool terminate = false;
+	bool notfound = false;
 	int iteration = 1;
 
 	printf( "Single step execution:\n" );
@@ -316,7 +317,15 @@ int main( int argc, char *argv[] )
 		while( instrs_map[n+1] != address ) {
 			n += 2;
 			if( n >= 2 * N ) {
-				n = 0;
+				if( !notfound ) {
+					n = 0;
+					notfound = true;
+				} else {
+					fprintf( stderr, "ERROR: address %X not found in hashmap\n", (unsigned int)address );
+					cs_close( &cs );
+					uc_close( uc );
+					exit( EXIT_FAILURE );
+				}
 			}
 		}
 		n = instrs_map[n];
-- 
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