[PATCH v2 3/3] aarch64: Add system registers for 2024 MPAM extension
Yury Khrustalev
yury.khrustalev@arm.com
Fri Jun 6 10:14:16 GMT 2025
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
---
.../aarch64/sysreg/armv9_3-a-sme-sysregs.d | 10 +++++++++
.../aarch64/sysreg/armv9_3-a-sme-sysregs.s | 2 ++
.../gas/aarch64/sysreg/armv9_3-a-sysregs.d | 21 +++++++++++++++++++
.../gas/aarch64/sysreg/armv9_3-a-sysregs.s | 13 ++++++++++++
gas/testsuite/gas/aarch64/sysreg/mpam-bad.d | 3 +++
gas/testsuite/gas/aarch64/sysreg/mpam-bad.l | 4 ++++
gas/testsuite/gas/aarch64/sysreg/mpam-bad.s | 6 ++++++
opcodes/aarch64-sys-regs.def | 8 +++++++
8 files changed, 67 insertions(+)
create mode 100644 gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.d
create mode 100644 gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.s
create mode 100644 gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.d
create mode 100644 gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.s
create mode 100644 gas/testsuite/gas/aarch64/sysreg/mpam-bad.d
create mode 100644 gas/testsuite/gas/aarch64/sysreg/mpam-bad.l
create mode 100644 gas/testsuite/gas/aarch64/sysreg/mpam-bad.s
diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.d b/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.d
new file mode 100644
index 00000000000..a40995c4e02
--- /dev/null
+++ b/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
diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.s b/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.s
new file mode 100644
index 00000000000..e5ac128bbcf
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sme-sysregs.s
@@ -0,0 +1,2 @@
+ mrs x0, mpambwsm_el1
+ msr mpambwsm_el1, x0
diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.d b/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.d
new file mode 100644
index 00000000000..46a05d2263f
--- /dev/null
+++ b/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
diff --git a/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.s b/gas/testsuite/gas/aarch64/sysreg/armv9_3-a-sysregs.s
new file mode 100644
index 00000000000..546bdbfcf56
--- /dev/null
+++ b/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
diff --git a/gas/testsuite/gas/aarch64/sysreg/mpam-bad.d b/gas/testsuite/gas/aarch64/sysreg/mpam-bad.d
new file mode 100644
index 00000000000..c3ec372010b
--- /dev/null
+++ b/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
diff --git a/gas/testsuite/gas/aarch64/sysreg/mpam-bad.l b/gas/testsuite/gas/aarch64/sysreg/mpam-bad.l
new file mode 100644
index 00000000000..34e919790a4
--- /dev/null
+++ b/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'
diff --git a/gas/testsuite/gas/aarch64/sysreg/mpam-bad.s b/gas/testsuite/gas/aarch64/sysreg/mpam-bad.s
new file mode 100644
index 00000000000..2a0f94fefbc
--- /dev/null
+++ b/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
diff --git a/opcodes/aarch64-sys-regs.def b/opcodes/aarch64-sys-regs.def
index d1ae109940c..964c0325d72 100644
--- a/opcodes/aarch64-sys-regs.def
+++ b/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))
--
2.39.5
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