import

qemu/include/exec/gen-icount.h

@@ -0,0 +1,72 @@
+#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 inline void gen_tb_start(TCGContext *tcg_ctx)
+{
+    // TCGv_i32 count;
+    TCGv_i32 flag;
+
+    tcg_ctx->exitreq_label = gen_new_label(tcg_ctx);
+    flag = tcg_temp_new_i32(tcg_ctx);
+    tcg_gen_ld_i32(tcg_ctx, flag, tcg_ctx->cpu_env,
+                   offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
+    tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_NE, flag, 0, tcg_ctx->exitreq_label);
+    tcg_temp_free_i32(tcg_ctx, flag);
+
+#if 0
+    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);
+#endif
+}
+
+static inline void gen_tb_end(TCGContext *tcg_ctx, TranslationBlock *tb, int num_insns)
+{
+    gen_set_label(tcg_ctx, tcg_ctx->exitreq_label);
+    tcg_gen_exit_tb(tcg_ctx, (uintptr_t)tb + TB_EXIT_REQUESTED);
+
+#if 0
+    if (use_icount) {
+        *icount_arg = num_insns;
+        gen_set_label(icount_label);
+        tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
+    }
+#endif
+}
+
+#if 0
+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
+
+#endif