diff --git a/gas/testsuite/gas/aarch64/system.d b/gas/testsuite/gas/aarch64/system.d
index be9536e..9ca9c5e 100644
--- a/gas/testsuite/gas/aarch64/system.d
+++ b/gas/testsuite/gas/aarch64/system.d
@@ -32,7 +32,7 @@ Disassembly of section \.text:
   60:	d503223f 	(hint	#0x11|psb	csync)
   64:	d503225f 	hint	#0x12
   68:	d503227f 	hint	#0x13
-  6c:	d503229f 	hint	#0x14
+  6c:	d503229f 	(hint	#0x14|csdb)
   70:	d50322bf 	hint	#0x15
   74:	d50322df 	hint	#0x16
   78:	d50322ff 	hint	#0x17

diff --git a/opcodes/aarch64-tbl.h b/opcodes/aarch64-tbl.h
index f758eeb..12b980e 100644
--- a/opcodes/aarch64-tbl.h
+++ b/opcodes/aarch64-tbl.h
@@ -3455,6 +3455,7 @@ struct aarch64_opcode aarch64_opcode_table[] =
   CORE_INSN ("msr", 0xd500401f, 0xfff8f01f, ic_system, 0, OP2 (PSTATEFIELD, UIMM4), {}, 0),
   CORE_INSN ("hint",0xd503201f, 0xfffff01f, ic_system, 0, OP1 (UIMM7), {}, F_HAS_ALIAS),
   CORE_INSN ("nop", 0xd503201f, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),
+  CORE_INSN ("csdb",0xd503229f, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),
   CORE_INSN ("yield", 0xd503203f, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),
   CORE_INSN ("wfe", 0xd503205f, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),
   CORE_INSN ("wfi", 0xd503207f, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),