aarch64: Add few missing system registers

This patch adds few missing system registers to GAS: LORC_EL1,
LOREA_EL1, LORN_EL1, LORSA_EL1, ICC_CTLR_EL3, ICC_SRE_ELX, ICH_VTR_EL2.

gas/ChangeLog:

2021-03-02  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* testsuite/gas/aarch64/illegal-sysreg-7.d: New test.
	* testsuite/gas/aarch64/illegal-sysreg-7.l: New test.
	* testsuite/gas/aarch64/illegal-sysreg-7.s: New test.
	* testsuite/gas/aarch64/sysreg-7.d: New test.
	* testsuite/gas/aarch64/sysreg-7.s: New test.

opcodes/ChangeLog:

2021-03-02  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* aarch64-opc.c: Add lorc_el1, lorea_el1, lorn_el1, lorsa_el1,
	icc_ctlr_el3, icc_sre_elx, ich_vtr_el2 system registers.

6 files changed, 59 insertions, 0 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 01161d5..79332f0 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,11 @@
+2021-03-12  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
+
+	* testsuite/gas/aarch64/illegal-sysreg-7.d: New test.
+	* testsuite/gas/aarch64/illegal-sysreg-7.l: New test.
+	* testsuite/gas/aarch64/illegal-sysreg-7.s: New test.
+	* testsuite/gas/aarch64/sysreg-7.d: New test.
+	* testsuite/gas/aarch64/sysreg-7.s: New test.
+
 2021-03-12  Clément Chigot  <clement.chigot@atos.net>
 
 	* config/tc-ppc.c (ppc_xcoff_text_section, ppc_xcoff_data_section,
diff --git a/gas/testsuite/gas/aarch64/illegal-sysreg-7.d b/gas/testsuite/gas/aarch64/illegal-sysreg-7.d
new file mode 100644
index 0000000..d7a11ed
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/illegal-sysreg-7.d
@@ -0,0 +1,2 @@
+#source: illegal-sysreg-7.s
+#warning_output: illegal-sysreg-7.l
diff --git a/gas/testsuite/gas/aarch64/illegal-sysreg-7.l b/gas/testsuite/gas/aarch64/illegal-sysreg-7.l
new file mode 100644
index 0000000..1db54b3
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/illegal-sysreg-7.l
@@ -0,0 +1,2 @@
+.*: Assembler messages:
+.*: Warning: specified register cannot be written to at operand 1 -- `msr ich_vtr_el2,x0'
diff --git a/gas/testsuite/gas/aarch64/illegal-sysreg-7.s b/gas/testsuite/gas/aarch64/illegal-sysreg-7.s
new file mode 100644
index 0000000..311e182
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/illegal-sysreg-7.s
@@ -0,0 +1,2 @@
+/* Write to R/O system registers.  */
+msr ich_vtr_el2, x0
diff --git a/gas/testsuite/gas/aarch64/sysreg-7.d b/gas/testsuite/gas/aarch64/sysreg-7.d
new file mode 100644
index 0000000..1564f53
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sysreg-7.d
@@ -0,0 +1,25 @@
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+ <.*>:
+
+.*:	d538a460 	mrs	x0, lorc_el1
+.*:	d538a420 	mrs	x0, lorea_el1
+.*:	d538a440 	mrs	x0, lorn_el1
+.*:	d538a400 	mrs	x0, lorsa_el1
+.*:	d53ecc80 	mrs	x0, icc_ctlr_el3
+.*:	d538cca0 	mrs	x0, icc_sre_el1
+.*:	d53cc9a0 	mrs	x0, icc_sre_el2
+.*:	d53ecca0 	mrs	x0, icc_sre_el3
+.*:	d53ccb20 	mrs	x0, ich_vtr_el2
+.*:	d518a460 	msr	lorc_el1, x0
+.*:	d518a420 	msr	lorea_el1, x0
+.*:	d518a440 	msr	lorn_el1, x0
+.*:	d518a400 	msr	lorsa_el1, x0
+.*:	d51ecc80 	msr	icc_ctlr_el3, x0
+.*:	d518cca0 	msr	icc_sre_el1, x0
+.*:	d51cc9a0 	msr	icc_sre_el2, x0
+.*:	d51ecca0 	msr	icc_sre_el3, x0
diff --git a/gas/testsuite/gas/aarch64/sysreg-7.s b/gas/testsuite/gas/aarch64/sysreg-7.s
new file mode 100644
index 0000000..3d438d1
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sysreg-7.s
@@ -0,0 +1,20 @@
+/* Read from system registers.  */
+mrs x0, lorc_el1
+mrs x0, lorea_el1
+mrs x0, lorn_el1
+mrs x0, lorsa_el1
+mrs x0, icc_ctlr_el3
+mrs x0, icc_sre_el1
+mrs x0, icc_sre_el2
+mrs x0, icc_sre_el3
+mrs x0, ich_vtr_el2
+
+/* Write to system registers.  */
+msr lorc_el1, x0
+msr lorea_el1, x0
+msr lorn_el1, x0
+msr lorsa_el1, x0
+msr icc_ctlr_el3, x0
+msr icc_sre_el1, x0
+msr icc_sre_el2, x0
+msr icc_sre_el3, x0