Fix Qemu user/kernel mode detection

gef.py

@@ -3350,15 +3350,15 @@ def is_qemu() -> bool:
 def is_qemu_usermode() -> bool:
     if not is_qemu():
         return False
-    response = gdb.execute('maintenance packet QOffsets', to_string=True, from_tty=False)
+    response = gdb.execute('maintenance packet qOffsets', to_string=True, from_tty=False)
     return "Text=" in response
 
 
 @lru_cache()
 def is_qemu_system() -> bool:
     if not is_qemu():
         return False
-    response = gdb.execute('maintenance packet QOffsets', to_string=True, from_tty=False)
+    response = gdb.execute('maintenance packet qOffsets', to_string=True, from_tty=False)
     return 'received: ""' in response
 
 
@@ -10191,8 +10191,12 @@ def maps(self) -> List[Section]:
 
     def __parse_maps(self) -> List[Section]:
         """Return the mapped memory sections"""
-        if is_qemu_system():
-            return list(self.__parse_info_mem())
+        try:
+            if is_qemu_system():
+                return list(self.__parse_info_mem())
+        except gdb.error:
+            # Target may not support this command
+            pass
         try:
             return list(self.__parse_procfs_maps())
         except FileNotFoundError:
@@ -10496,13 +10500,9 @@ def auxiliary_vector(self) -> Optional[Dict[str, int]]:
             return None
         if is_qemu_system():
             return None
-
         if not self._auxiliary_vector:
             auxiliary_vector = {}
-            try:
-                auxv_info = gdb.execute("info auxv", to_string=True)
-            except gdb.error:
-                auxv_info = None
+            auxv_info = gdb.execute("info auxv", to_string=True)
             if not auxv_info or "failed" in auxv_info:
                 err("Failed to query auxiliary variables")
                 return None