Better error reporting

datashadow/datashadow_callbacks.c

@@ -66,8 +66,9 @@ void fptr_shadow_check_64(int p_shadowIndex, int p_policy, void **p_shadow)
 		switch (p_policy) {
 			case SHADOW_CONTINUE:
 #ifdef DEBUG
-		my_strcpy(msg, "Warning: overwrite of function pointer detected -- restoring saved value: 0x");
+		my_strcpy(msg, "Warning: overwrite of function pointer detected -- restoring saved value: shadow: 0x");
 		itox(*p_shadow, &msg[strlen(msg)]);
+
 		my_strcpy(&msg[strlen(msg)], " \n");
 		write(2, msg, strlen(msg));
 #endif
@@ -76,7 +77,11 @@ void fptr_shadow_check_64(int p_shadowIndex, int p_policy, void **p_shadow)
 			default:
 				{
 				char msg[MAX_DIAGNOSTIC_SIZE];
-				my_strcpy(msg, "Warning: overwrite of function pointer detected -- induce segfault\n");
+				my_strcpy(msg, "shadow value: 0x");
+				itox(*p_shadow, &msg[strlen(msg)]);
+				my_strcpy(&msg[strlen(msg)], " shadow idx: 0x");
+				itox(p_shadowIndex, &msg[strlen(msg)]);
+				my_strcpy(&msg[strlen(msg)], " : Warning: overwrite of function pointer or critical detected -- induce segfault\n");
 				write(2, msg, strlen(msg));
 				my_strcpy(0,""); // induce crash
 				}