[Qemu-devel] [PATCH] Ignore writes of perf reg (cp15 with crm == 12)

[Loïc Minier]

On ARMv7, ignore writes to cp15 with crm == 12; these are to setup perf
counters which we don't have.
---
 target-arm/helper.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 2dd64d9..865829f 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1457,6 +1457,8 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn, 
uint32_t val)
         }
         break;
     case 9:
+        if (arm_feature(env, ARM_FEATURE_V7) && crm == 12)
+            break; /* Perf counters. */
         if (arm_feature(env, ARM_FEATURE_OMAPCP))
             break;
         switch (crm) {
-- 
1.7.1