Archipelago » qemu

/* Helpers for instruction counting code generation.  */

static TCGArg *icount_arg;

static int icount_label;

static inline void gen_icount_start(void)

{

    TCGv count;

    if (!use_icount)

        return;

    icount_label = gen_new_label();

    /* FIXME: This generates lousy code.  We can't use tcg_new_temp because

       count needs to live over the conditional branch.  To workaround this

       we allow the target to supply a convenient register temporary.  */

#ifndef ICOUNT_TEMP

    count = tcg_temp_local_new(TCG_TYPE_I32);

#else

    count = ICOUNT_TEMP;

#endif

    tcg_gen_ld_i32(count, cpu_env, offsetof(CPUState, icount_decr.u32));

    /* This is a horrid hack to allow fixing up the value later.  */

    icount_arg = gen_opparam_ptr + 1;

    tcg_gen_subi_i32(count, count, 0xdeadbeef);

    tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);

    tcg_gen_st16_i32(count, cpu_env, offsetof(CPUState, icount_decr.u16.low));

#ifndef ICOUNT_TEMP

    tcg_temp_free(count);

#endif

}

static void gen_icount_end(TranslationBlock *tb, int num_insns)

{

    if (use_icount) {

        *icount_arg = num_insns;

        gen_set_label(icount_label);

        tcg_gen_exit_tb((long)tb + 2);

    }

}

static void inline gen_io_start(void)

{

    TCGv tmp = tcg_const_i32(1);

    tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));

    tcg_temp_free(tmp);

}

static inline void gen_io_end(void)

{

    TCGv tmp = tcg_const_i32(0);

    tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));

    tcg_temp_free(tmp);

}