diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs-archv9_4-unsupported.d b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs-archv9_4-unsupported.d
new file mode 100644
index 00000000000..8ad01bc7409
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs-archv9_4-unsupported.d
@@ -0,0 +1,3 @@
+#source: armv9_5-a-sysregs.s
+#as: -march=armv9.4-a -I$srcdir/$subdir
+#error_output: armv9_5-a-sysregs-archv9_4-unsupported.l
diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs-archv9_4-unsupported.l b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs-archv9_4-unsupported.l
new file mode 100644
index 00000000000..cf7f21febf7
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs-archv9_4-unsupported.l
@@ -0,0 +1,9 @@
+[^ :]+: Assembler messages:
+[^ :]+:[0-9]+: Error: selected processor does not support system register name 'vdisr_el3'
+[^ :]+:[0-9]+:  Info: macro invoked from here
+[^ :]+:[0-9]+: Error: selected processor does not support system register name 'vdisr_el3'
+[^ :]+:[0-9]+:  Info: macro invoked from here
+[^ :]+:[0-9]+: Error: selected processor does not support system register name 'vsesr_el3'
+[^ :]+:[0-9]+:  Info: macro invoked from here
+[^ :]+:[0-9]+: Error: selected processor does not support system register name 'vsesr_el3'
+[^ :]+:[0-9]+:  Info: macro invoked from here
diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs.d b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs.d
new file mode 100644
index 00000000000..31f4eb8e9cb
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs.d
@@ -0,0 +1,13 @@
+#source: armv9_5-a-sysregs.s
+#as: -march=armv9.5-a -I$srcdir/$subdir
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+ <.*>:
+.*:	d51ec120 	msr	vdisr_el3, x0
+.*:	d53ec120 	mrs	x0, vdisr_el3
+.*:	d51e5260 	msr	vsesr_el3, x0
+.*:	d53e5260 	mrs	x0, vsesr_el3
diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs.s b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs.s
new file mode 100644
index 00000000000..085fced1652
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sysreg/armv9_5-a-sysregs.s
@@ -0,0 +1,7 @@
+.include "sysreg-test-utils.inc"
+
+.text
+
+/* Delegated SError exceptions for EL3. */
+rw_sys_reg sys_reg=vdisr_el3 xreg=x0 r=1 w=1
+rw_sys_reg sys_reg=vsesr_el3 xreg=x0 r=1 w=1
diff --git a/include/opcode/aarch64.h b/include/opcode/aarch64.h
index 9daa911394f..17c4ee95e73 100644
--- a/include/opcode/aarch64.h
+++ b/include/opcode/aarch64.h
@@ -183,6 +183,8 @@ enum aarch64_feature_bit {
   AARCH64_FEATURE_LSE128,
   /* ARMv8.9-A RAS Extensions.  */
   AARCH64_FEATURE_RASv2,
+  /* Delegated SError exceptions for EL3. */
+  AARCH64_FEATURE_E3DSE,
   /* System Control Register2.  */
   AARCH64_FEATURE_SCTLR2,
   /* Fine Grained Traps.  */
@@ -366,7 +368,9 @@ enum aarch64_feature_bit {
 #define AARCH64_ARCH_V9_5A_FEATURES(X)	(AARCH64_FEATBIT (X, V9_5A)	\
 					 | AARCH64_FEATBIT (X, CPA)	\
 					 | AARCH64_FEATBIT (X, LUT)	\
-					 | AARCH64_FEATBIT (X, FAMINMAX))
+					 | AARCH64_FEATBIT (X, FAMINMAX)\
+					 | AARCH64_FEATBIT (X, E3DSE)	\
+					)
 
 /* Architectures are the sum of the base and extensions.  */
 #define AARCH64_ARCH_V8A(X)	(AARCH64_FEATBIT (X, V8) \
diff --git a/opcodes/aarch64-sys-regs.def b/opcodes/aarch64-sys-regs.def
index 3e68035d62a..def3dd65633 100644
--- a/opcodes/aarch64-sys-regs.def
+++ b/opcodes/aarch64-sys-regs.def
@@ -1229,6 +1229,7 @@
   SYSREG ("vbar_el2",		CPENC (3,4,12,0,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("vbar_el3",		CPENC (3,6,12,0,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("vdisr_el2",		CPENC (3,4,12,1,1),	F_ARCHEXT,		AARCH64_FEATURE (RAS))
+  SYSREG ("vdisr_el3",		CPENC (3,6,12,1,1),	F_ARCHEXT,		AARCH64_FEATURE (E3DSE))
   SYSREG ("vmecid_a_el2",	CPENC (3,4,10,9,1),	0,			AARCH64_NO_FEATURES)
   SYSREG ("vmecid_p_el2",	CPENC (3,4,10,9,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("vmpidr_el2",		CPENC (3,4,0,0,5),	0,			AARCH64_NO_FEATURES)
@@ -1236,6 +1237,7 @@
   SYSREG ("vpidr_el2",		CPENC (3,4,0,0,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("vsctlr_el2",		CPENC (3,4,2,0,0),	F_ARCHEXT,		AARCH64_FEATURE (V8R))
   SYSREG ("vsesr_el2",		CPENC (3,4,5,2,3),	F_ARCHEXT,		AARCH64_FEATURE (RAS))
+  SYSREG ("vsesr_el3",		CPENC (3,6,5,2,3),	F_ARCHEXT,		AARCH64_FEATURE (E3DSE))
   SYSREG ("vstcr_el2",		CPENC (3,4,2,6,2),	F_ARCHEXT,		AARCH64_FEATURE (V8_4A))
   SYSREG ("vsttbr_el2",		CPENC (3,4,2,6,0),	F_ARCHEXT,		AARCH64_FEATURES (2, V8A, V8_4A))
   SYSREG ("vtcr_el2",		CPENC (3,4,2,1,2),	0,			AARCH64_NO_FEATURES)