1d6198c3b0
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6000 c046a42c-6fe2-441c-8c8c-71466251a162
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* Helpers for instruction counting code generation. */
|
|
|
|
static TCGArg *icount_arg;
|
|
static int icount_label;
|
|
|
|
static inline void gen_icount_start(void)
|
|
{
|
|
TCGv_i32 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_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_i32(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_i32 tmp = tcg_const_i32(1);
|
|
tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
|
|
tcg_temp_free_i32(tmp);
|
|
}
|
|
|
|
static inline void gen_io_end(void)
|
|
{
|
|
TCGv_i32 tmp = tcg_const_i32(0);
|
|
tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
|
|
tcg_temp_free_i32(tmp);
|
|
}
|