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-rw-r--r--qemu/include/exec/gen-icount.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/qemu/include/exec/gen-icount.h b/qemu/include/exec/gen-icount.h
new file mode 100644
index 000000000..05d89d358
--- /dev/null
+++ b/qemu/include/exec/gen-icount.h
@@ -0,0 +1,79 @@
+#ifndef GEN_ICOUNT_H
+#define GEN_ICOUNT_H 1
+
+#include "qemu/timer.h"
+
+/* Helpers for instruction counting code generation. */
+
+static TCGArg *icount_arg;
+static TCGLabel *icount_label;
+static TCGLabel *exitreq_label;
+
+static inline void gen_tb_start(TranslationBlock *tb)
+{
+ TCGv_i32 count, flag, imm;
+ int i;
+
+ 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 (!(tb->cflags & CF_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));
+
+ imm = tcg_temp_new_i32();
+ tcg_gen_movi_i32(imm, 0xdeadbeef);
+
+ /* This is a horrid hack to allow fixing up the value later. */
+ i = tcg_ctx.gen_last_op_idx;
+ i = tcg_ctx.gen_op_buf[i].args;
+ icount_arg = &tcg_ctx.gen_opparam_buf[i + 1];
+
+ tcg_gen_sub_i32(count, count, imm);
+ tcg_temp_free_i32(imm);
+
+ 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 (tb->cflags & CF_USE_ICOUNT) {
+ *icount_arg = num_insns;
+ gen_set_label(icount_label);
+ tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
+ }
+
+ /* Terminate the linked list. */
+ tcg_ctx.gen_op_buf[tcg_ctx.gen_last_op_idx].next = -1;
+}
+
+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