target-arm: A64: add set_pc cpu method

When executing translation blocks we need to be able to recover
our program counter. Add a method to set it for AArch64 CPUs.
This covers user-mode, but for system mode emulation we will
need to check if the CPU is in an AArch32 execution state.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>

target-arm/cpu64.c

@@ -68,11 +68,22 @@ static void aarch64_cpu_finalizefn(Object *obj)
 {
 }
 
+static void aarch64_cpu_set_pc(CPUState *cs, vaddr value)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    /*
+     * TODO: this will need updating for system emulation,
+     * when the core may be in AArch32 mode.
+     */
+    cpu->env.pc = value;
+}
+
 static void aarch64_cpu_class_init(ObjectClass *oc, void *data)
 {
     CPUClass *cc = CPU_CLASS(oc);
 
     cc->dump_state = aarch64_cpu_dump_state;
+    cc->set_pc = aarch64_cpu_set_pc;
     cc->gdb_read_register = aarch64_cpu_gdb_read_register;
     cc->gdb_write_register = aarch64_cpu_gdb_write_register;
     cc->gdb_num_core_regs = 34;