[PATCH qemu] target/arm: add support for 64-bit PMCCNTR in AArch32 mode

[~arichardson]

From: Alex Richardson <alexrichardson@google.com>

See 
https://developer.arm.com/documentation/ddi0601/2024-06/AArch32-Registers/PMCCNTR--Performance-Monitors-Cycle-Count-Register?lang=en

Signed-off-by: Alex Richardson <alexrichardson@google.com>
---
 target/arm/helper.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 8fb4b474e8..94900667c3 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -5952,6 +5952,12 @@ static const ARMCPRegInfo v8_cp_reginfo[] = {
       .access = PL1_RW, .accessfn = access_trap_aa32s_el1,
       .writefn = sdcr_write,
       .fieldoffset = offsetoflow32(CPUARMState, cp15.mdcr_el3) },
+    { .name = "PMCCNTR", .state = ARM_CP_STATE_AA32,
+      .type = ARM_CP_ALIAS | ARM_CP_IO | ARM_CP_64BIT,
+      .cp = 15, .crm = 9, .opc1 = 0,
+      .access = PL0_RW, .resetvalue = 0, .fgt = FGT_PMCCNTR_EL0,
+      .readfn = pmccntr_read, .writefn = pmccntr_write,
+      .accessfn = pmreg_access_ccntr },
 };
 
 /* These are present only when EL1 supports AArch32 */
-- 
2.43.4