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-rw-r--r--cpu-exec.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/cpu-exec.c b/cpu-exec.c
index f49a436e1a..7380b1eb4d 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -320,7 +320,9 @@ found:
return tb;
}
-static inline TranslationBlock *tb_find_fast(CPUState *cpu)
+static inline TranslationBlock *tb_find_fast(CPUState *cpu,
+ TranslationBlock **last_tb,
+ int tb_exit)
{
CPUArchState *env = (CPUArchState *)cpu->env_ptr;
TranslationBlock *tb;
@@ -331,11 +333,24 @@ static inline TranslationBlock *tb_find_fast(CPUState *cpu)
always be the same before a given translated block
is executed. */
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
+ tb_lock();
tb = cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)];
if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
tb->flags != flags)) {
tb = tb_find_slow(cpu, pc, cs_base, flags);
}
+ if (cpu->tb_flushed) {
+ /* Ensure that no TB jump will be modified as the
+ * translation buffer has been flushed.
+ */
+ *last_tb = NULL;
+ cpu->tb_flushed = false;
+ }
+ /* See if we can patch the calling TB. */
+ if (*last_tb && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
+ tb_add_jump(*last_tb, tb_exit, tb);
+ }
+ tb_unlock();
return tb;
}
@@ -441,7 +456,8 @@ int cpu_exec(CPUState *cpu)
} 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);
+ last_tb = NULL; /* Avoid chaining TBs */
+ cpu_exec_nocache(cpu, 1, tb_find_fast(cpu, &last_tb, 0), true);
ret = -1;
break;
#endif
@@ -511,20 +527,7 @@ int cpu_exec(CPUState *cpu)
cpu->exception_index = EXCP_INTERRUPT;
cpu_loop_exit(cpu);
}
- tb_lock();
- tb = tb_find_fast(cpu);
- if (cpu->tb_flushed) {
- /* Ensure that no TB jump will be modified as the
- * translation buffer has been flushed.
- */
- last_tb = NULL;
- cpu->tb_flushed = false;
- }
- /* See if we can patch the calling TB. */
- if (last_tb && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
- tb_add_jump(last_tb, tb_exit, tb);
- }
- tb_unlock();
+ tb = tb_find_fast(cpu, &last_tb, tb_exit);
if (likely(!cpu->exit_request)) {
uintptr_t ret;
trace_exec_tb(tb, tb->pc);