include/exec/tb-lookup.h

   1 /*
   2  * Copyright (C) 2017, Emilio G. Cota <cota@braap.org>
   3  *
   4  * License: GNU GPL, version 2 or later.
   5  *   See the COPYING file in the top-level directory.
   6  */
   7 #ifndef EXEC_TB_LOOKUP_H
   8 #define EXEC_TB_LOOKUP_H
   9
  10 #include "qemu/osdep.h"
  11
  12 #ifdef NEED_CPU_H
  13 #include "cpu.h"
  14 #else
  15 #include "exec/poison.h"
  16 #endif
  17
  18 #include "exec/exec-all.h"
  19 #include "exec/tb-hash.h"
  20
  21 /* Might cause an exception, so have a longjmp destination ready */
  22 static inline TranslationBlock *
  23 tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc, target_ulong *cs_base,
  24                      uint32_t *flags)
  25 {
  26     CPUArchState *env = (CPUArchState *)cpu->env_ptr;
  27     TranslationBlock *tb;
  28     uint32_t hash;
  29
  30     cpu_get_tb_cpu_state(env, pc, cs_base, flags);
  31     hash = tb_jmp_cache_hash_func(*pc);
  32     tb = atomic_rcu_read(&cpu->tb_jmp_cache[hash]);
  33     if (likely(tb &&
  34                tb->pc == *pc &&
  35                tb->cs_base == *cs_base &&
  36                tb->flags == *flags &&
  37                tb->trace_vcpu_dstate == *cpu->trace_dstate &&
  38                !(atomic_read(&tb->cflags) & CF_INVALID))) {
  39         return tb;
  40     }
  41     tb = tb_htable_lookup(cpu, *pc, *cs_base, *flags);
  42     if (tb == NULL) {
  43         return NULL;
  44     }
  45     atomic_set(&cpu->tb_jmp_cache[hash], tb);
  46     return tb;
  47 }
  48
  49 #endif /* EXEC_TB_LOOKUP_H */