| #ifndef GEN_ICOUNT_H |
| #define GEN_ICOUNT_H 1 |
| |
| #include "qemu/timer.h" |
| |
| /* Helpers for instruction counting code generation. */ |
| |
| static TCGArg *icount_arg; |
| static int icount_label; |
| static int exitreq_label; |
| |
| static inline void gen_tb_start(void) |
| { |
| TCGv_i32 count; |
| TCGv_i32 flag; |
| |
| exitreq_label = gen_new_label(); |
| flag = tcg_temp_new_i32(); |
| tcg_gen_ld_i32(flag, cpu_env, |
| offsetof(CPUState, tcg_exit_req) - ENV_OFFSET); |
| tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label); |
| tcg_temp_free_i32(flag); |
| |
| if (!use_icount) |
| return; |
| |
| icount_label = gen_new_label(); |
| count = tcg_temp_local_new_i32(); |
| tcg_gen_ld_i32(count, cpu_env, |
| -ENV_OFFSET + offsetof(CPUState, icount_decr.u32)); |
| /* This is a horrid hack to allow fixing up the value later. */ |
| icount_arg = tcg_ctx.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, |
| -ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low)); |
| tcg_temp_free_i32(count); |
| } |
| |
| static void gen_tb_end(TranslationBlock *tb, int num_insns) |
| { |
| gen_set_label(exitreq_label); |
| tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED); |
| |
| if (use_icount) { |
| *icount_arg = num_insns; |
| gen_set_label(icount_label); |
| tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED); |
| } |
| } |
| |
| static inline void gen_io_start(void) |
| { |
| TCGv_i32 tmp = tcg_const_i32(1); |
| tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + 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, -ENV_OFFSET + offsetof(CPUState, can_do_io)); |
| tcg_temp_free_i32(tmp); |
| } |
| |
| #endif |