aarch64: Add system registers for 2024 MPAM extension

This patch adds support for new system registers introduced in the
2024 MPAM extension (Memory Partitioning and Monitoring):

Available in Armv9.3-A:
  MPAMBW0_EL1,
  MPAMBW1_EL1,
  MPAMBW1_EL12,
  MPAMBW2_EL2,
  MPAMBW3_EL3,
  MPAMBWCAP_EL2,
  MPAMBWIDR_EL1

Available in Armv9.3-A with SME:
  MPAMBWSM_EL1

The details can be found in [1].

[1]: https://developer.arm.com/documentation/ddi0601/latest

gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.d

@@ -0,0 +1,10 @@
+#as: -march=armv9.3-a+sme
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+ <.*>:
+.*:	d538a5e0 	mrs	x0, mpambwsm_el1
+.*:	d518a5e0 	msr	mpambwsm_el1, x0

gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.s

@@ -0,0 +1,2 @@
+	mrs	x0, mpambwsm_el1
+	msr	mpambwsm_el1, x0

gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.d

@@ -0,0 +1,21 @@
+#as: -march=armv9.3-a
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+ <.*>:
+[^:]+:\s+d538a5a0 	mrs	x0, mpambw0_el1
+[^:]+:\s+d518a5a0 	msr	mpambw0_el1, x0
+[^:]+:\s+d538a580 	mrs	x0, mpambw1_el1
+[^:]+:\s+d518a580 	msr	mpambw1_el1, x0
+[^:]+:\s+d53da580 	mrs	x0, mpambw1_el12
+[^:]+:\s+d51da580 	msr	mpambw1_el12, x0
+[^:]+:\s+d53ca580 	mrs	x0, mpambw2_el2
+[^:]+:\s+d51ca580 	msr	mpambw2_el2, x0
+[^:]+:\s+d53ea580 	mrs	x0, mpambw3_el3
+[^:]+:\s+d51ea580 	msr	mpambw3_el3, x0
+[^:]+:\s+d53ca5c0 	mrs	x0, mpambwcap_el2
+[^:]+:\s+d51ca5c0 	msr	mpambwcap_el2, x0
+[^:]+:\s+d538a4a0 	mrs	x0, mpambwidr_el1

gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.s

@@ -0,0 +1,13 @@
+	mrs	x0, mpambw0_el1
+	msr	mpambw0_el1, x0
+	mrs	x0, mpambw1_el1
+	msr	mpambw1_el1, x0
+	mrs	x0, mpambw1_el12
+	msr	mpambw1_el12, x0
+	mrs	x0, mpambw2_el2
+	msr	mpambw2_el2, x0
+	mrs	x0, mpambw3_el3
+	msr	mpambw3_el3, x0
+	mrs	x0, mpambwcap_el2
+	msr	mpambwcap_el2, x0
+	mrs	x0, mpambwidr_el1

gas/testsuite/gas/aarch64/sysreg/mpam-bad.d

@@ -0,0 +1,3 @@
+#as: -march=armv9.3-a
+#source: mpam-bad.s
+#error_output: mpam-bad.l

gas/testsuite/gas/aarch64/sysreg/mpam-bad.l

@@ -0,0 +1,4 @@
+.*: Assembler messages:
+.*: Warning: specified register cannot be written to at operand 1 -- `msr mpambwidr_el1,x0'
+.*: Error: selected processor does not support system register name 'mpambwsm_el1'
+.*: Error: selected processor does not support system register name 'mpambwsm_el1'

gas/testsuite/gas/aarch64/sysreg/mpam-bad.s

@@ -0,0 +1,6 @@
+/* This is read-only register */
+msr mpambwidr_el1, x0
+
+/* This register is not available without +sme flag */
+mrs x0, mpambwsm_el1
+msr mpambwsm_el1, x0

opcodes/aarch64-sys-regs.def

@@ -591,6 +591,14 @@
   SYSREG ("mpam1_el12",		CPENC (3,5,10,5,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mpam2_el2",		CPENC (3,4,10,5,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mpam3_el3",		CPENC (3,6,10,5,0),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("mpambw0_el1",	CPENC (3,0,10,5,5),	F_ARCHEXT,		AARCH64_FEATURE (V9_3A))
+  SYSREG ("mpambw1_el1",	CPENC (3,0,10,5,4),	F_ARCHEXT,		AARCH64_FEATURE (V9_3A))
+  SYSREG ("mpambw1_el12",	CPENC (3,5,10,5,4),	F_ARCHEXT,		AARCH64_FEATURE (V9_3A))
+  SYSREG ("mpambw2_el2",	CPENC (3,4,10,5,4),	F_ARCHEXT,		AARCH64_FEATURE (V9_3A))
+  SYSREG ("mpambw3_el3",	CPENC (3,6,10,5,4),	F_ARCHEXT,		AARCH64_FEATURE (V9_3A))
+  SYSREG ("mpambwcap_el2",	CPENC (3,4,10,5,6),	F_ARCHEXT,		AARCH64_FEATURE (V9_3A))
+  SYSREG ("mpambwidr_el1",	CPENC (3,0,10,4,5),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (V9_3A))
+  SYSREG ("mpambwsm_el1",	CPENC (3,0,10,5,7),	F_ARCHEXT,		AARCH64_FEATURES (2, SME, V9_3A))
   SYSREG ("mpamhcr_el2",	CPENC (3,4,10,4,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mpamidr_el1",	CPENC (3,0,10,4,4),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("mpamsm_el1",		CPENC (3,0,10,5,3),	F_ARCHEXT,		AARCH64_FEATURE (SME))