include/exec/gen-icount.h

   1 #ifndef GEN_ICOUNT_H
   2 #define GEN_ICOUNT_H
   3
   4 #include "qemu/timer.h"
   5
   6 /* Helpers for instruction counting code generation.  */
   7
   8 static TCGOp *icount_start_insn;
   9
  10 static inline void gen_tb_start(TranslationBlock *tb)
  11 {
  12     TCGv_i32 count, imm;
  13
  14     tcg_ctx->exitreq_label = gen_new_label();
  15     if (tb_cflags(tb) & CF_USE_ICOUNT) {
  16         count = tcg_temp_local_new_i32();
  17     } else {
  18         count = tcg_temp_new_i32();
  19     }
  20
  21     tcg_gen_ld_i32(count, cpu_env,
  22                    offsetof(ArchCPU, neg.icount_decr.u32) -
  23                    offsetof(ArchCPU, env));
  24
  25     if (tb_cflags(tb) & CF_USE_ICOUNT) {
  26         imm = tcg_temp_new_i32();
  27         /* We emit a movi with a dummy immediate argument. Keep the insn index
  28          * of the movi so that we later (when we know the actual insn count)
  29          * can update the immediate argument with the actual insn count.  */
  30         tcg_gen_movi_i32(imm, 0xdeadbeef);
  31         icount_start_insn = tcg_last_op();
  32
  33         tcg_gen_sub_i32(count, count, imm);
  34         tcg_temp_free_i32(imm);
  35     }
  36
  37     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, tcg_ctx->exitreq_label);
  38
  39     if (tb_cflags(tb) & CF_USE_ICOUNT) {
  40         tcg_gen_st16_i32(count, cpu_env,
  41                          offsetof(ArchCPU, neg.icount_decr.u16.low) -
  42                          offsetof(ArchCPU, env));
  43     }
  44
  45     tcg_temp_free_i32(count);
  46 }
  47
  48 static inline void gen_tb_end(TranslationBlock *tb, int num_insns)
  49 {
  50     if (tb_cflags(tb) & CF_USE_ICOUNT) {
  51         /* Update the num_insn immediate parameter now that we know
  52          * the actual insn count.  */
  53         tcg_set_insn_param(icount_start_insn, 1, num_insns);
  54     }
  55
  56     gen_set_label(tcg_ctx->exitreq_label);
  57     tcg_gen_exit_tb(tb, TB_EXIT_REQUESTED);
  58 }
  59
  60 static inline void gen_io_start(void)
  61 {
  62     TCGv_i32 tmp = tcg_const_i32(1);
  63     tcg_gen_st_i32(tmp, cpu_env,
  64                    offsetof(ArchCPU, parent_obj.can_do_io) -
  65                    offsetof(ArchCPU, env));
  66     tcg_temp_free_i32(tmp);
  67 }
  68
  69 static inline void gen_io_end(void)
  70 {
  71     TCGv_i32 tmp = tcg_const_i32(0);
  72     tcg_gen_st_i32(tmp, cpu_env,
  73                    offsetof(ArchCPU, parent_obj.can_do_io) -
  74                    offsetof(ArchCPU, env));
  75     tcg_temp_free_i32(tmp);
  76 }
  77
  78 #endif