qom: Add cpu_exec_interrupt hook

Continuing the removal of ifdefs from cpu_exec.

Cc: Andreas Färber <afaerber@suse.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-7-git-send-email-rth@twiddle.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

cpu-exec.c

@@ -676,8 +676,15 @@ int cpu_exec(CPUArchState *env)
                         next_tb = 0;
                     }
 #endif
-                   /* Don't use the cached interrupt_request value,
-                      do_interrupt may have updated the EXITTB flag. */
+                    /* The target hook has 3 exit conditions:
+                       False when the interrupt isn't processed,
+                       True when it is, and we should restart on a new TB,
+                       and via longjmp via cpu_loop_exit.  */
+                    if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
+                        next_tb = 0;
+                    }
+                    /* Don't use the cached interrupt_request value,
+                       do_interrupt may have updated the EXITTB flag. */
                     if (cpu->interrupt_request & CPU_INTERRUPT_EXITTB) {
                         cpu->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
                         /* ensure that no TB jump will be modified as
@@ -783,10 +790,7 @@ int cpu_exec(CPUArchState *env)
              * local variables as longjmp is marked 'noreturn'. */
             cpu = current_cpu;
             env = cpu->env_ptr;
-#if !(defined(CONFIG_USER_ONLY) && \
-      (defined(TARGET_M68K) || defined(TARGET_PPC) || defined(TARGET_S390X)))
             cc = CPU_GET_CLASS(cpu);
-#endif
 #ifdef TARGET_I386
             x86_cpu = X86_CPU(cpu);
 #endif

include/qom/cpu.h

@@ -101,6 +101,7 @@ struct TranslationBlock;
  * @gdb_core_xml_file: File name for core registers GDB XML description.
  * @cpu_exec_enter: Callback for cpu_exec preparation.
  * @cpu_exec_exit: Callback for cpu_exec cleanup.
+ * @cpu_exec_interrupt: Callback for processing interrupts in cpu_exec.
  *
  * Represents a CPU family or model.
  */
@@ -154,6 +155,7 @@ typedef struct CPUClass {
 
     void (*cpu_exec_enter)(CPUState *cpu);
     void (*cpu_exec_exit)(CPUState *cpu);
+    bool (*cpu_exec_interrupt)(CPUState *cpu, int interrupt_request);
 } CPUClass;
 
 #ifdef HOST_WORDS_BIGENDIAN

qom/cpu.c

@@ -206,6 +206,11 @@ static void cpu_common_noop(CPUState *cpu)
 {
 }
 
+static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
+{
+    return false;
+}
+
 void cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
                     int flags)
 {
@@ -347,6 +352,7 @@ static void cpu_class_init(ObjectClass *klass, void *data)
     k->debug_excp_handler = cpu_common_noop;
     k->cpu_exec_enter = cpu_common_noop;
     k->cpu_exec_exit = cpu_common_noop;
+    k->cpu_exec_interrupt = cpu_common_exec_interrupt;
     dc->realize = cpu_common_realizefn;
     /*
      * Reason: CPUs still need special care by board code: wiring up