aarch64: Add new test exception-generation.d

svc and dcps* were already tested, but are included here as part of the
same encoding group.

gas/testsuite/gas/aarch64/exception-generation.d

@@ -0,0 +1,28 @@
+#as: -march=armv8-a
+#objdump: -dr
+
+.*:     file format .*
+
+
+Disassembly of section \.text:
+
+0+ <\.text>:
+ *[0-9a-f]+:	d4000001 	svc	#0x0
+ *[0-9a-f]+:	d41fffe1 	svc	#0xffff
+ *[0-9a-f]+:	d4000002 	hvc	#0x0
+ *[0-9a-f]+:	d41fffe2 	hvc	#0xffff
+ *[0-9a-f]+:	d4000003 	smc	#0x0
+ *[0-9a-f]+:	d41fffe3 	smc	#0xffff
+ *[0-9a-f]+:	d4200000 	brk	#0x0
+ *[0-9a-f]+:	d43fffe0 	brk	#0xffff
+ *[0-9a-f]+:	d4400000 	hlt	#0x0
+ *[0-9a-f]+:	d45fffe0 	hlt	#0xffff
+ *[0-9a-f]+:	d4a00001 	dcps1
+ *[0-9a-f]+:	d4a00001 	dcps1
+ *[0-9a-f]+:	d4bfffe1 	dcps1	#0xffff
+ *[0-9a-f]+:	d4a00002 	dcps2
+ *[0-9a-f]+:	d4a00002 	dcps2
+ *[0-9a-f]+:	d4bfffe2 	dcps2	#0xffff
+ *[0-9a-f]+:	d4a00003 	dcps3
+ *[0-9a-f]+:	d4a00003 	dcps3
+ *[0-9a-f]+:	d4bfffe3 	dcps3	#0xffff

gas/testsuite/gas/aarch64/exception-generation.s

@@ -0,0 +1,26 @@
+	svc	#0
+	svc	#65535
+
+	hvc	#0
+	hvc	#65535
+
+	smc	#0
+	smc	#65535
+
+	brk	#0
+	brk	#65535
+
+	hlt	#0
+	hlt	#65535
+
+	dcps1
+	dcps1	#0
+	dcps1	#65535
+
+	dcps2
+	dcps2	#0
+	dcps2	#65535
+
+	dcps3
+	dcps3	#0
+	dcps3	#65535