From: Tobias Röhmel <tobias.roehmel@rwth-aachen.de>

RVBAR shadows RVBAR_ELx where x is the highest exception
level if the highest EL is not EL3. This patch also allows
ARMv8 CPUs to change the reset address with
the rvbar property.

Signed-off-by: Tobias Röhmel <tobias.roehmel@rwth-aachen.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20221206102504.165775-3-tobias.roehmel@rwth-aachen.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/cpu.c    |  6 +++++-
 target/arm/helper.c | 21 ++++++++++++++-------
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 2fa022f62ba..c107cbd7574 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -309,6 +309,10 @@ static void arm_cpu_reset_hold(Object *obj)
         env->cp15.cpacr_el1 = FIELD_DP64(env->cp15.cpacr_el1,
                                          CPACR, CP11, 3);
 #endif
+        if (arm_feature(env, ARM_FEATURE_V8)) {
+            env->cp15.rvbar = cpu->rvbar_prop;
+            env->regs[15] = cpu->rvbar_prop;
+        }
     }
 
 #if defined(CONFIG_USER_ONLY)
@@ -1345,7 +1349,7 @@ void arm_cpu_post_init(Object *obj)
         qdev_property_add_static(DEVICE(obj), &arm_cpu_reset_hivecs_property);
     }
 
-    if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
+    if (arm_feature(&cpu->env, ARM_FEATURE_V8)) {
         object_property_add_uint64_ptr(obj, "rvbar",
                                        &cpu->rvbar_prop,
                                        OBJ_PROP_FLAG_READWRITE);
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 090daf93c71..d8066fe97d3 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -7896,7 +7896,7 @@ void register_cp_regs_for_features(ARMCPU *cpu)
         if (!arm_feature(env, ARM_FEATURE_EL3) &&
             !arm_feature(env, ARM_FEATURE_EL2)) {
             ARMCPRegInfo rvbar = {
-                .name = "RVBAR_EL1", .state = ARM_CP_STATE_AA64,
+                .name = "RVBAR_EL1", .state = ARM_CP_STATE_BOTH,
                 .opc0 = 3, .opc1 = 0, .crn = 12, .crm = 0, .opc2 = 1,
                 .access = PL1_R,
                 .fieldoffset = offsetof(CPUARMState, cp15.rvbar),
@@ -7987,13 +7987,20 @@ void register_cp_regs_for_features(ARMCPU *cpu)
         }
         /* RVBAR_EL2 is only implemented if EL2 is the highest EL */
         if (!arm_feature(env, ARM_FEATURE_EL3)) {
-            ARMCPRegInfo rvbar = {
-                .name = "RVBAR_EL2", .state = ARM_CP_STATE_AA64,
-                .opc0 = 3, .opc1 = 4, .crn = 12, .crm = 0, .opc2 = 1,
-                .access = PL2_R,
-                .fieldoffset = offsetof(CPUARMState, cp15.rvbar),
+            ARMCPRegInfo rvbar[] = {
+                {
+                    .name = "RVBAR_EL2", .state = ARM_CP_STATE_AA64,
+                    .opc0 = 3, .opc1 = 4, .crn = 12, .crm = 0, .opc2 = 1,
+                    .access = PL2_R,
+                    .fieldoffset = offsetof(CPUARMState, cp15.rvbar),
+                },
+                {   .name = "RVBAR", .type = ARM_CP_ALIAS,
+                    .cp = 15, .opc1 = 0, .crn = 12, .crm = 0, .opc2 = 1,
+                    .access = PL2_R,
+                    .fieldoffset = offsetof(CPUARMState, cp15.rvbar),
+                },
             };
-            define_one_arm_cp_reg(cpu, &rvbar);
+            define_arm_cp_regs(cpu, rvbar);
         }
     }
 
-- 
2.25.1