[PULL 09/11] target/arm: add support for PMUv3 64-bit PMCCNTR in AArch32 mode

[Peter Maydell]

From: Alex Richardson <alexrichardson@google.com>

In the PMUv3, a new AArch32 64-bit (MCRR/MRRC) accessor for the
PMCCNTR was added. In QEMU we forgot to implement this, so only
provide the 32-bit accessor. Since we have a 64-bit PMCCNTR
sysreg for AArch64, adding the 64-bit AArch32 version is easy.

We add the PMCCNTR to the v8_cp_reginfo because PMUv3 was added
in the ARMv8 architecture. This is consistent with how we
handle the existing PMCCNTR support, where we always implement
it for all v7 CPUs. This is arguably something we should
clean up so it is gated on ARM_FEATURE_PMU and/or an ID
register check for the relevant PMU version, but we should
do that as its own tidyup rather than being inconsistent between
this PMCCNTR accessor and the others.

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>
Message-id: 20240801220328.941866-1-alexrichardson@google.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 8fb4b474e83..94900667c33 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 */
-- 
2.34.1