Add rseq syscall dummy implementation

Author: elicn

qiling/os/posix/syscall/__init__.py

@@ -14,6 +14,7 @@
 from .ptrace import *
 from .random import *
 from .resource import *
+from .rseq import *
 from .sched import *
 from .select import *
 from .sendfile import *

qiling/os/posix/syscall/rseq.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+#
+# Cross Platform and Multi Architecture Advanced Binary Emulation Framework
+#
+
+from qiling import Qiling
+
+
+def ql_syscall_rseq(ql: Qiling, rseq: int, rseq_len: int, flags: int, sig: int):
+    # indicate rseq is not supported by this kernel
+    # return -ENOSYS
+
+    return 0