target/arm: Handle AArch64 in TYPE_ARM_CPU gdb_arch_name

Instead of having the TYPE_AARCH64_CPU subclass set
CPUClass::gdb_arch_name to a different function, make the
TYPE_ARM_CPU implementation of the method handle AArch64.

For the moment we make the "is this AArch64?" function test "is the
CPU of TYPE_AARCH64_CPU?", so that this produces no behavioural
change.  When we've moved all the gdbstub related methods across to
the base class, we will be able to change this to be "does the CPU
have the ARM_FEATURE_AARCH64 feature?".

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250317142819.900029-4-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

3 files changed, 9 insertions, 6 deletions

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 00577f9..bed0e58 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -2649,6 +2649,9 @@ static const gchar *arm_gdb_arch_name(CPUState *cs)
     ARMCPU *cpu = ARM_CPU(cs);
     CPUARMState *env = &cpu->env;
 
+    if (arm_gdbstub_is_aarch64(cpu)) {
+        return "aarch64";
+    }
     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
         return "iwmmxt";
     }
diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index eaf5705..fbb7e7b 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -813,11 +813,6 @@ static void aarch64_cpu_finalizefn(Object *obj)
 {
 }
 
-static const gchar *aarch64_gdb_arch_name(CPUState *cs)
-{
-    return "aarch64";
-}
-
 static void aarch64_cpu_class_init(ObjectClass *oc, const void *data)
 {
     CPUClass *cc = CPU_CLASS(oc);
@@ -825,7 +820,6 @@ static void aarch64_cpu_class_init(ObjectClass *oc, const void *data)
     cc->gdb_read_register = aarch64_cpu_gdb_read_register;
     cc->gdb_write_register = aarch64_cpu_gdb_write_register;
     cc->gdb_core_xml_file = "aarch64-core.xml";
-    cc->gdb_arch_name = aarch64_gdb_arch_name;
 
     object_class_property_add_bool(oc, "aarch64", aarch64_cpu_get_aarch64,
                                    aarch64_cpu_set_aarch64);
diff --git a/target/arm/internals.h b/target/arm/internals.h
index d24acdd..08f4bd1 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -1826,6 +1826,12 @@ void aarch64_add_pauth_properties(Object *obj);
 void aarch64_add_sve_properties(Object *obj);
 void aarch64_add_sme_properties(Object *obj);
 
+/* Return true if the gdbstub is presenting an AArch64 CPU */
+static inline bool arm_gdbstub_is_aarch64(ARMCPU *cpu)
+{
+    return object_dynamic_cast(OBJECT(cpu), TYPE_AARCH64_CPU);
+}
+
 /* Read the CONTROL register as the MRS instruction would. */
 uint32_t arm_v7m_mrs_control(CPUARMState *env, uint32_t secure);