LXR qemu/include/exec/gen-icount.h

   1#ifndef GEN_ICOUNT_H
   2#define GEN_ICOUNT_H 1
   3
   4#include "qemu/timer.h"
   5
   6/* Helpers for instruction counting code generation.  */
   7
   8static TCGArg *icount_arg;
   9static int icount_label;
  10
  11static inline void gen_icount_start(void)
  12{
  13    TCGv_i32 count;
  14
  15    if (!use_icount)
  16        return;
  17
  18    icount_label = gen_new_label();
  19    count = tcg_temp_local_new_i32();
  20    tcg_gen_ld_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u32));
  21    /* This is a horrid hack to allow fixing up the value later.  */
  22    icount_arg = tcg_ctx.gen_opparam_ptr + 1;
  23    tcg_gen_subi_i32(count, count, 0xdeadbeef);
  24
  25    tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
  26    tcg_gen_st16_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u16.low));
  27    tcg_temp_free_i32(count);
  28}
  29
  30static void gen_icount_end(TranslationBlock *tb, int num_insns)
  31{
  32    if (use_icount) {
  33        *icount_arg = num_insns;
  34        gen_set_label(icount_label);
  35        tcg_gen_exit_tb((tcg_target_long)tb + 2);
  36    }
  37}
  38
  39static inline void gen_io_start(void)
  40{
  41    TCGv_i32 tmp = tcg_const_i32(1);
  42    tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io));
  43    tcg_temp_free_i32(tmp);
  44}
  45
  46static inline void gen_io_end(void)
  47{
  48    TCGv_i32 tmp = tcg_const_i32(0);
  49    tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io));
  50    tcg_temp_free_i32(tmp);
  51}
  52
  53#endif
  54