aarch64: Add support for VMSA feature enhancements.

This patch adds the permission model enhancement and memory
attribute index enhancement features and their corresponding
system registers in AArch64 assembler.
Permission Indirection Extension (FEAT_S1PIE, FEAT_S2PIE)
Permission Overlay Extension (FEAT_S1POE, FEAT_S2POE)
Memory Attribute Index Enhancement (FEAT_AIE)
Extension to Translation Control Registers (FEAT_TCR2)

These features are available by default from Armv9.4-A architecture.

3 files changed, 166 insertions, 0 deletions

diff --git a/gas/testsuite/gas/aarch64/armv8_9-a-sysregs-bad.l b/gas/testsuite/gas/aarch64/armv8_9-a-sysregs-bad.l
index 1b67843..71ec06e 100644
--- a/gas/testsuite/gas/aarch64/armv8_9-a-sysregs-bad.l
+++ b/gas/testsuite/gas/aarch64/armv8_9-a-sysregs-bad.l
@@ -27,3 +27,53 @@
 .*: Error: selected processor does not support system register name 's1e1a'
 .*: Error: selected processor does not support system register name 's1e2a'
 .*: Error: selected processor does not support system register name 's1e3a'
+.*: Error: selected processor does not support system register name 'amair2_el1'
+.*: Error: selected processor does not support system register name 'amair2_el12'
+.*: Error: selected processor does not support system register name 'amair2_el2'
+.*: Error: selected processor does not support system register name 'amair2_el3'
+.*: Error: selected processor does not support system register name 'mair2_el1'
+.*: Error: selected processor does not support system register name 'mair2_el12'
+.*: Error: selected processor does not support system register name 'mair2_el2'
+.*: Error: selected processor does not support system register name 'mair2_el3'
+.*: Error: selected processor does not support system register name 'amair2_el1'
+.*: Error: selected processor does not support system register name 'amair2_el12'
+.*: Error: selected processor does not support system register name 'amair2_el2'
+.*: Error: selected processor does not support system register name 'amair2_el3'
+.*: Error: selected processor does not support system register name 'mair2_el1'
+.*: Error: selected processor does not support system register name 'mair2_el12'
+.*: Error: selected processor does not support system register name 'mair2_el2'
+.*: Error: selected processor does not support system register name 'mair2_el3'
+.*: Error: selected processor does not support system register name 'pir_el1'
+.*: Error: selected processor does not support system register name 'pir_el12'
+.*: Error: selected processor does not support system register name 'pir_el2'
+.*: Error: selected processor does not support system register name 'pir_el3'
+.*: Error: selected processor does not support system register name 'pire0_el1'
+.*: Error: selected processor does not support system register name 'pire0_el12'
+.*: Error: selected processor does not support system register name 'pire0_el2'
+.*: Error: selected processor does not support system register name 'pir_el1'
+.*: Error: selected processor does not support system register name 'pir_el12'
+.*: Error: selected processor does not support system register name 'pir_el2'
+.*: Error: selected processor does not support system register name 'pir_el3'
+.*: Error: selected processor does not support system register name 'pire0_el1'
+.*: Error: selected processor does not support system register name 'pire0_el12'
+.*: Error: selected processor does not support system register name 'pire0_el2'
+.*: Error: selected processor does not support system register name 's2pir_el2'
+.*: Error: selected processor does not support system register name 's2pir_el2'
+.*: Error: selected processor does not support system register name 'por_el0'
+.*: Error: selected processor does not support system register name 'por_el1'
+.*: Error: selected processor does not support system register name 'por_el12'
+.*: Error: selected processor does not support system register name 'por_el2'
+.*: Error: selected processor does not support system register name 'por_el3'
+.*: Error: selected processor does not support system register name 'por_el0'
+.*: Error: selected processor does not support system register name 'por_el1'
+.*: Error: selected processor does not support system register name 'por_el12'
+.*: Error: selected processor does not support system register name 'por_el2'
+.*: Error: selected processor does not support system register name 'por_el3'
+.*: Error: selected processor does not support system register name 's2por_el1'
+.*: Error: selected processor does not support system register name 's2por_el1'
+.*: Error: selected processor does not support system register name 'tcr2_el1'
+.*: Error: selected processor does not support system register name 'tcr2_el12'
+.*: Error: selected processor does not support system register name 'tcr2_el2'
+.*: Error: selected processor does not support system register name 'tcr2_el1'
+.*: Error: selected processor does not support system register name 'tcr2_el12'
+.*: Error: selected processor does not support system register name 'tcr2_el2'
diff --git a/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.d b/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.d
index 18376bb..ea4cc86 100644
--- a/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.d
+++ b/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.d
@@ -34,3 +34,53 @@ Disassembly of section \.text:
 .*:	d5087941 	at	s1e1a, x1
 .*:	d50c7943 	at	s1e2a, x3
 .*:	d50e7945 	at	s1e3a, x5
+.*:	d538a320 	mrs	x0, amair2_el1
+.*:	d53da320 	mrs	x0, amair2_el12
+.*:	d53ca320 	mrs	x0, amair2_el2
+.*:	d53ea320 	mrs	x0, amair2_el3
+.*:	d538a220 	mrs	x0, mair2_el1
+.*:	d53da220 	mrs	x0, mair2_el12
+.*:	d53ca120 	mrs	x0, mair2_el2
+.*:	d53ea120 	mrs	x0, mair2_el3
+.*:	d518a320 	msr	amair2_el1, x0
+.*:	d51da320 	msr	amair2_el12, x0
+.*:	d51ca320 	msr	amair2_el2, x0
+.*:	d51ea320 	msr	amair2_el3, x0
+.*:	d518a220 	msr	mair2_el1, x0
+.*:	d51da220 	msr	mair2_el12, x0
+.*:	d51ca120 	msr	mair2_el2, x0
+.*:	d51ea120 	msr	mair2_el3, x0
+.*:	d538a260 	mrs	x0, pir_el1
+.*:	d53da260 	mrs	x0, pir_el12
+.*:	d53ca260 	mrs	x0, pir_el2
+.*:	d53ea260 	mrs	x0, pir_el3
+.*:	d538a240 	mrs	x0, pire0_el1
+.*:	d53da240 	mrs	x0, pire0_el12
+.*:	d53ca240 	mrs	x0, pire0_el2
+.*:	d518a260 	msr	pir_el1, x0
+.*:	d51da260 	msr	pir_el12, x0
+.*:	d51ca260 	msr	pir_el2, x0
+.*:	d51ea260 	msr	pir_el3, x0
+.*:	d518a240 	msr	pire0_el1, x0
+.*:	d51da240 	msr	pire0_el12, x0
+.*:	d51ca240 	msr	pire0_el2, x0
+.*:	d53ca2a0 	mrs	x0, s2pir_el2
+.*:	d51ca2a0 	msr	s2pir_el2, x0
+.*:	d53ba280 	mrs	x0, por_el0
+.*:	d538a280 	mrs	x0, por_el1
+.*:	d53da280 	mrs	x0, por_el12
+.*:	d53ca280 	mrs	x0, por_el2
+.*:	d53ea280 	mrs	x0, por_el3
+.*:	d51ba280 	msr	por_el0, x0
+.*:	d518a280 	msr	por_el1, x0
+.*:	d51da280 	msr	por_el12, x0
+.*:	d51ca280 	msr	por_el2, x0
+.*:	d51ea280 	msr	por_el3, x0
+.*:	d538a2a0 	mrs	x0, s2por_el1
+.*:	d518a2a0 	msr	s2por_el1, x0
+.*:	d5382060 	mrs	x0, tcr2_el1
+.*:	d53d2060 	mrs	x0, tcr2_el12
+.*:	d53c2060 	mrs	x0, tcr2_el2
+.*:	d5182060 	msr	tcr2_el1, x0
+.*:	d51d2060 	msr	tcr2_el12, x0
+.*:	d51c2060 	msr	tcr2_el2, x0
diff --git a/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.s b/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.s
index 4e494a9..2768c26 100644
--- a/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.s
+++ b/gas/testsuite/gas/aarch64/armv8_9-a-sysregs.s
@@ -32,3 +32,69 @@
 	at s1e1a, x1
 	at s1e2a, x3
 	at s1e3a, x5
+
+	/* FEAT_AIE.  */
+	mrs x0, amair2_el1
+	mrs x0, amair2_el12
+	mrs x0, amair2_el2
+	mrs x0, amair2_el3
+	mrs x0, mair2_el1
+	mrs x0, mair2_el12
+	mrs x0, mair2_el2
+	mrs x0, mair2_el3
+
+	msr amair2_el1, x0
+	msr amair2_el12, x0
+	msr amair2_el2, x0
+	msr amair2_el3, x0
+	msr mair2_el1, x0
+	msr mair2_el12, x0
+	msr mair2_el2, x0
+	msr mair2_el3, x0
+
+	/* FEAT_S1PIE.  */
+	mrs x0, pir_el1
+	mrs x0, pir_el12
+	mrs x0, pir_el2
+	mrs x0, pir_el3
+	mrs x0, pire0_el1
+	mrs x0, pire0_el12
+	mrs x0, pire0_el2
+
+	msr pir_el1, x0
+	msr pir_el12, x0
+	msr pir_el2, x0
+	msr pir_el3, x0
+	msr pire0_el1, x0
+	msr pire0_el12, x0
+	msr pire0_el2, x0
+
+	/* FEAT_S2PIE.  */
+	mrs x0, s2pir_el2
+	msr s2pir_el2, x0
+
+	/* FEAT_S1POE.  */
+	mrs x0, por_el0
+	mrs x0, por_el1
+	mrs x0, por_el12
+	mrs x0, por_el2
+	mrs x0, por_el3
+
+	msr por_el0, x0
+	msr por_el1, x0
+	msr por_el12, x0
+	msr por_el2, x0
+	msr por_el3, x0
+
+	/* FEAT_S21POE.  */
+	mrs x0, s2por_el1
+	msr s2por_el1, x0
+
+	/* FEAT_TCR2.  */
+	mrs x0, tcr2_el1
+	mrs x0, tcr2_el12
+	mrs x0, tcr2_el2
+
+	msr tcr2_el1, x0
+	msr tcr2_el12, x0
+	msr tcr2_el2, x0