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cb9c377f PB |
1 | #ifndef GEN_ICOUNT_H |
2 | #define GEN_ICOUNT_H 1 | |
3 | ||
1de7afc9 | 4 | #include "qemu/timer.h" |
29e922b6 | 5 | |
bf20dc07 | 6 | /* Helpers for instruction counting code generation. */ |
dd5d6fe9 PB |
7 | |
8 | static TCGArg *icount_arg; | |
9 | static int icount_label; | |
378df4b2 | 10 | static int exitreq_label; |
dd5d6fe9 | 11 | |
806f352d | 12 | static inline void gen_tb_start(void) |
dd5d6fe9 | 13 | { |
a7812ae4 | 14 | TCGv_i32 count; |
378df4b2 PM |
15 | TCGv_i32 flag; |
16 | ||
17 | exitreq_label = gen_new_label(); | |
a4960ef3 | 18 | flag = tcg_temp_new_i32(); |
378df4b2 PM |
19 | tcg_gen_ld_i32(flag, cpu_env, |
20 | offsetof(CPUState, tcg_exit_req) - ENV_OFFSET); | |
21 | tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label); | |
22 | tcg_temp_free_i32(flag); | |
dd5d6fe9 PB |
23 | |
24 | if (!use_icount) | |
25 | return; | |
26 | ||
27 | icount_label = gen_new_label(); | |
a7812ae4 | 28 | count = tcg_temp_local_new_i32(); |
9349b4f9 | 29 | tcg_gen_ld_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u32)); |
dd5d6fe9 | 30 | /* This is a horrid hack to allow fixing up the value later. */ |
c4afe5c4 | 31 | icount_arg = tcg_ctx.gen_opparam_ptr + 1; |
dd5d6fe9 PB |
32 | tcg_gen_subi_i32(count, count, 0xdeadbeef); |
33 | ||
34 | tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label); | |
9349b4f9 | 35 | tcg_gen_st16_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u16.low)); |
a7812ae4 | 36 | tcg_temp_free_i32(count); |
dd5d6fe9 PB |
37 | } |
38 | ||
806f352d | 39 | static void gen_tb_end(TranslationBlock *tb, int num_insns) |
dd5d6fe9 | 40 | { |
378df4b2 | 41 | gen_set_label(exitreq_label); |
8cfd0495 | 42 | tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED); |
378df4b2 | 43 | |
dd5d6fe9 PB |
44 | if (use_icount) { |
45 | *icount_arg = num_insns; | |
46 | gen_set_label(icount_label); | |
8cfd0495 | 47 | tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED); |
dd5d6fe9 PB |
48 | } |
49 | } | |
50 | ||
86178a57 | 51 | static inline void gen_io_start(void) |
dd5d6fe9 | 52 | { |
a7812ae4 | 53 | TCGv_i32 tmp = tcg_const_i32(1); |
9349b4f9 | 54 | tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io)); |
a7812ae4 | 55 | tcg_temp_free_i32(tmp); |
dd5d6fe9 PB |
56 | } |
57 | ||
58 | static inline void gen_io_end(void) | |
59 | { | |
a7812ae4 | 60 | TCGv_i32 tmp = tcg_const_i32(0); |
9349b4f9 | 61 | tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io)); |
a7812ae4 | 62 | tcg_temp_free_i32(tmp); |
dd5d6fe9 | 63 | } |
cb9c377f PB |
64 | |
65 | #endif |