[RFC,v1,02/11] cpu-exec: elide more icount code if CONFIG_USER_ONLY

Commit Message

Alex Bennée March 18, 2016, 4:18 p.m. UTC

From: Paolo Bonzini <[e-mail]>

Signed-off-by: Paolo Bonzini <[e-mail]>
Signed-off-by: Alex Bennée <[e-mail]>

---
v1
  - #ifndef replay code to match elided functions
---
 cpu-exec.c | 8 ++++++++
 1 file changed, 8 insertions(+)

Patch

diff --git a/cpu-exec.c b/cpu-exec.c
index 52f25de..e71113e 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -183,6 +183,7 @@  static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, uint8_t *tb_ptr)
     return next_tb;
 }
 
+#ifndef CONFIG_USER_ONLY
 /* Execute the code without caching the generated code. An interpreter
    could be used if available. */
 static void cpu_exec_nocache(CPUState *cpu, int max_cycles,
@@ -208,6 +209,7 @@  static void cpu_exec_nocache(CPUState *cpu, int max_cycles,
     tb_phys_invalidate(tb, -1);
     tb_free(tb);
 }
+#endif
 
 static TranslationBlock *tb_find_physical(CPUState *cpu,
                                           target_ulong pc,
@@ -427,12 +429,14 @@  int cpu_exec(CPUState *cpu)
                     }
 #endif
                 }
+#ifndef CONFIG_USER_ONLY
             } else if (replay_has_exception()
                        && cpu->icount_decr.u16.low + cpu->icount_extra == 0) {
                 /* try to cause an exception pending in the log */
                 cpu_exec_nocache(cpu, 1, tb_find_fast(cpu), true);
                 ret = -1;
                 break;
+#endif
             }
 
             next_tb = 0; /* force lookup of first TB */
@@ -553,6 +557,9 @@  int cpu_exec(CPUState *cpu)
                     case TB_EXIT_ICOUNT_EXPIRED:
                     {
                         /* Instruction counter expired.  */
+#ifdef CONFIG_USER_ONLY
+                        abort();
+#else
                         int insns_left = cpu->icount_decr.u32;
                         if (cpu->icount_extra && insns_left >= 0) {
                             /* Refill decrementer and continue execution.  */
@@ -572,6 +579,7 @@  int cpu_exec(CPUState *cpu)
                             cpu_loop_exit(cpu);
                         }
                         break;
+#endif
                     }
                     default:
                         break;