@@ -47,13 +47,22 @@ typedef struct ARMCPUClass {
void (*parent_reset)(CPUState *cpu);
} ARMCPUClass;
+typedef struct ARMCPU ARMCPU;
+
+/**
+ * ARMELChangeHook:
+ * type of a function which can be registered via arm_register_el_change_hook()
+ * to get callbacks when the CPU changes its exception level or mode.
+ */
+typedef void ARMELChangeHook(ARMCPU *cpu, void *opaque);
+
/**
* ARMCPU:
* @env: #CPUARMState
*
* An ARM CPU core.
*/
-typedef struct ARMCPU {
+struct ARMCPU {
/*< private >*/
CPUState parent_obj;
/*< public >*/
@@ -185,7 +194,10 @@ typedef struct ARMCPU {
/* DCZ blocksize, in log_2(words), ie low 4 bits of DCZID_EL0 */
uint32_t dcz_blocksize;
uint64_t rvbar;
-} ARMCPU;
+
+ ARMELChangeHook *el_change_hook;
+ void *el_change_hook_opaque;
+};
#define TYPE_AARCH64_CPU "aarch64-cpu"
#define AARCH64_CPU_CLASS(klass) \
@@ -257,4 +269,28 @@ int aarch64_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
int aarch64_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
#endif
+/**
+ * arm_register_el_change_hook:
+ * Register a hook function which will be called back whenever this
+ * CPU changes exception level or mode. The hook function will be
+ * passed a pointer to the ARMCPU and the opaque data pointer passed
+ * to this function when the hook was registered.
+ *
+ * Note that we currently only support registering a single hook function,
+ * and will assert if this function is called twice.
+ * This facility is intended for the use of the GICv3 emulation.
+ */
+void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHook *hook,
+ void *opaque);
+
+/**
+ * arm_get_el_change_hook_opaque:
+ * Return the opaque data that will be used by the el_change_hook
+ * for this CPU.
+ */
+static inline void *arm_get_el_change_hook_opaque(ARMCPU *cpu)
+{
+ return cpu->el_change_hook_opaque;
+}
+
#endif
@@ -50,6 +50,15 @@ static bool arm_cpu_has_work(CPUState *cs)
| CPU_INTERRUPT_EXITTB);
}
+void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHook *hook,
+ void *opaque)
+{
+ /* We currently only support registering a single hook function */
+ assert(!cpu->el_change_hook);
+ cpu->el_change_hook = hook;
+ cpu->el_change_hook_opaque = opaque;
+}
+
static void cp_reg_reset(gpointer key, gpointer value, gpointer opaque)
{
/* Reset a single ARMCPRegInfo register */
@@ -6476,6 +6476,8 @@ void arm_cpu_do_interrupt(CPUState *cs)
arm_cpu_do_interrupt_aarch32(cs);
}
+ arm_call_el_change_hook(cpu);
+
if (!kvm_enabled()) {
cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
}
@@ -476,4 +476,12 @@ bool arm_s1_regime_using_lpae_format(CPUARMState *env, ARMMMUIdx mmu_idx);
void arm_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr, int is_write,
int is_user, uintptr_t retaddr);
+/* Call the EL change hook if one has been registered */
+static inline void arm_call_el_change_hook(ARMCPU *cpu)
+{
+ if (cpu->el_change_hook) {
+ cpu->el_change_hook(cpu, cpu->el_change_hook_opaque);
+ }
+}
+
#endif
@@ -434,6 +434,8 @@ void HELPER(cpsr_write)(CPUARMState *env, uint32_t val, uint32_t mask)
void HELPER(cpsr_write_eret)(CPUARMState *env, uint32_t val)
{
cpsr_write(env, val, CPSR_ERET_MASK, CPSRWriteExceptionReturn);
+
+ arm_call_el_change_hook(arm_env_get_cpu(env));
}
/* Access to user mode registers from privileged modes. */
@@ -929,6 +931,8 @@ void HELPER(exception_return)(CPUARMState *env)
env->pc = env->elr_el[cur_el];
}
+ arm_call_el_change_hook(arm_env_get_cpu(env));
+
return;
illegal_return:
The GICv3 CPU interface needs to know when the CPU it is attached to makes an exception level or mode transition that changes the security state, because whether it is asserting IRQ or FIQ can change depending on these things. Provide a mechanism for letting the GICv3 device register a hook to be called on such changes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- target-arm/cpu-qom.h | 40 ++++++++++++++++++++++++++++++++++++++-- target-arm/cpu.c | 9 +++++++++ target-arm/helper.c | 2 ++ target-arm/internals.h | 8 ++++++++ target-arm/op_helper.c | 4 ++++ 5 files changed, 61 insertions(+), 2 deletions(-)