diff options
| -rw-r--r-- | include/exec/exec-all.h | 1 | ||||
| -rw-r--r-- | include/exec/gen-icount.h | 21 |
2 files changed, 18 insertions, 4 deletions
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h index 6bb2a0f..35d8e93 100644 --- a/include/exec/exec-all.h +++ b/include/exec/exec-all.h @@ -503,6 +503,7 @@ struct TranslationBlock { #define CF_USE_ICOUNT 0x00020000 #define CF_INVALID 0x00040000 /* TB is stale. Set with @jmp_lock held */ #define CF_PARALLEL 0x00080000 /* Generate code for a parallel context */ +#define CF_NOIRQ 0x00100000 /* Generate an uninterruptible TB */ #define CF_CLUSTER_MASK 0xff000000 /* Top 8 bits are cluster ID */ #define CF_CLUSTER_SHIFT 24 diff --git a/include/exec/gen-icount.h b/include/exec/gen-icount.h index 610cba5..c57204d 100644 --- a/include/exec/gen-icount.h +++ b/include/exec/gen-icount.h @@ -21,7 +21,6 @@ static inline void gen_tb_start(const TranslationBlock *tb) { TCGv_i32 count; - tcg_ctx->exitreq_label = gen_new_label(); if (tb_cflags(tb) & CF_USE_ICOUNT) { count = tcg_temp_local_new_i32(); } else { @@ -42,7 +41,19 @@ static inline void gen_tb_start(const TranslationBlock *tb) icount_start_insn = tcg_last_op(); } - tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, tcg_ctx->exitreq_label); + /* + * Emit the check against icount_decr.u32 to see if we should exit + * unless we suppress the check with CF_NOIRQ. If we are using + * icount and have suppressed interruption the higher level code + * should have ensured we don't run more instructions than the + * budget. + */ + if (tb_cflags(tb) & CF_NOIRQ) { + tcg_ctx->exitreq_label = NULL; + } else { + tcg_ctx->exitreq_label = gen_new_label(); + tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, tcg_ctx->exitreq_label); + } if (tb_cflags(tb) & CF_USE_ICOUNT) { tcg_gen_st16_i32(count, cpu_env, @@ -74,8 +85,10 @@ static inline void gen_tb_end(const TranslationBlock *tb, int num_insns) tcgv_i32_arg(tcg_constant_i32(num_insns))); } - gen_set_label(tcg_ctx->exitreq_label); - tcg_gen_exit_tb(tb, TB_EXIT_REQUESTED); + if (tcg_ctx->exitreq_label) { + gen_set_label(tcg_ctx->exitreq_label); + tcg_gen_exit_tb(tb, TB_EXIT_REQUESTED); + } } #endif |