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 #ifdef NEED_CPU_H
  11 #include "cpu.h"
  12 #else
  13 #include "exec/poison.h"
  14 #endif
  15
  16 #include "exec/exec-all.h"
  17 #include "exec/tb-hash.h"
  18
  19 /* Might cause an exception, so have a longjmp destination ready */
  20 static inline TranslationBlock *
  21 tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc, target_ulong *cs_base,
  22                      uint32_t *flags, uint32_t cf_mask)
  23 {
  24     CPUArchState *env = (CPUArchState *)cpu->env_ptr;
  25     TranslationBlock *tb;
  26     uint32_t hash;
  27
  28     cpu_get_tb_cpu_state(env, pc, cs_base, flags);
  29     hash = tb_jmp_cache_hash_func(*pc);
  30     tb = atomic_rcu_read(&cpu->tb_jmp_cache[hash]);
  31     if (likely(tb &&
  32                tb->pc == *pc &&
  33                tb->cs_base == *cs_base &&
  34                tb->flags == *flags &&
  35                tb->trace_vcpu_dstate == *cpu->trace_dstate &&
  36                (tb_cflags(tb) & (CF_HASH_MASK | CF_INVALID)) == cf_mask)) {
  37         return tb;
  38     }
  39     tb = tb_htable_lookup(cpu, *pc, *cs_base, *flags, cf_mask);
  40     if (tb == NULL) {
  41         return NULL;
  42     }
  43     atomic_set(&cpu->tb_jmp_cache[hash], tb);
  44     return tb;
  45 }
  46
  47 #endif /* EXEC_TB_LOOKUP_H */