Also fix the existing bitmask for writes.

Signed-off-by: Aaron Lindsay <alindsay@codeaurora.org>
---
 target/arm/helper.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index e8189b8..530fc7c 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -1059,10 +1059,25 @@ static void pmccfiltr_write(CPUARMState *env, const ARMCPRegInfo *ri,
                             uint64_t value)
 {
     pmccntr_sync(env);
-    env->cp15.pmccfiltr_el0 = value & 0x7E000000;
+    env->cp15.pmccfiltr_el0 = value & 0xfc000000;
     pmccntr_sync(env);
 }
 
+static void pmccfiltr_write_a32(CPUARMState *env, const ARMCPRegInfo *ri,
+                            uint64_t value)
+{
+    pmccntr_sync(env);
+    env->cp15.pmccfiltr_el0 = (env->cp15.pmccfiltr_el0 & 0x04000000) |
+        (value & 0xf8000000); /* M is not visible in AArch32 */
+    pmccntr_sync(env);
+}
+
+static uint64_t pmccfiltr_read_a32(CPUARMState *env, const ARMCPRegInfo *ri)
+{
+    /* M is not visible in AArch32 */
+    return env->cp15.pmccfiltr_el0 & 0xf8000000;
+}
+
 static void pmcntenset_write(CPUARMState *env, const ARMCPRegInfo *ri,
                             uint64_t value)
 {
@@ -1280,6 +1295,12 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
       .type = ARM_CP_IO,
       .readfn = pmccntr_read, .writefn = pmccntr_write, },
 #endif
+    { .name = "PMCCFILTR", .cp = 15, .opc1 = 0, .crn = 14, .crm = 15, .opc2 = 7,
+      .writefn = pmccfiltr_write_a32, .readfn = pmccfiltr_read_a32,
+      .access = PL0_RW, .accessfn = pmreg_access,
+      .type = ARM_CP_ALIAS,
+      .fieldoffset = offsetoflow32(CPUARMState, cp15.pmccfiltr_el0),
+      .resetvalue = 0, },
     { .name = "PMCCFILTR_EL0", .state = ARM_CP_STATE_AA64,
       .opc0 = 3, .opc1 = 3, .crn = 14, .crm = 15, .opc2 = 7,
       .writefn = pmccfiltr_write,
-- 
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