LXR qemu/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 */
  20static inline TranslationBlock *
  21tb_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 */
  48