#ifndef GEN_ICOUNT_H
#define GEN_ICOUNT_H
+#include "exec/exec-all.h"
#include "qemu/timer.h"
/* Helpers for instruction counting code generation. */
tcg_temp_free_i32(tmp);
}
-/*
- * cpu->can_do_io is cleared automatically at the beginning of
- * each translation block. The cost is minimal and only paid
- * for -icount, plus it would be very easy to forget doing it
- * in the translator. Therefore, backends only need to call
- * gen_io_start.
- */
-static inline void gen_io_end(void)
+static inline void gen_tb_start(const TranslationBlock *tb)
{
- TCGv_i32 tmp = tcg_const_i32(0);
- tcg_gen_st_i32(tmp, cpu_env,
- offsetof(ArchCPU, parent_obj.can_do_io) -
- offsetof(ArchCPU, env));
- tcg_temp_free_i32(tmp);
-}
-
-static inline void gen_tb_start(TranslationBlock *tb)
-{
- TCGv_i32 count, imm;
+ TCGv_i32 count;
tcg_ctx->exitreq_label = gen_new_label();
if (tb_cflags(tb) & CF_USE_ICOUNT) {
offsetof(ArchCPU, env));
if (tb_cflags(tb) & CF_USE_ICOUNT) {
- imm = tcg_temp_new_i32();
- /* We emit a movi with a dummy immediate argument. Keep the insn index
- * of the movi so that we later (when we know the actual insn count)
- * can update the immediate argument with the actual insn count. */
- tcg_gen_movi_i32(imm, 0xdeadbeef);
+ /*
+ * We emit a sub with a dummy immediate argument. Keep the insn index
+ * of the sub so that we later (when we know the actual insn count)
+ * can update the argument with the actual insn count.
+ */
+ tcg_gen_sub_i32(count, count, tcg_constant_i32(0));
icount_start_insn = tcg_last_op();
-
- tcg_gen_sub_i32(count, count, imm);
- tcg_temp_free_i32(imm);
}
tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, tcg_ctx->exitreq_label);
tcg_gen_st16_i32(count, cpu_env,
offsetof(ArchCPU, neg.icount_decr.u16.low) -
offsetof(ArchCPU, env));
- gen_io_end();
+ /*
+ * cpu->can_do_io is cleared automatically here at the beginning of
+ * each translation block. The cost is minimal and only paid for
+ * -icount, plus it would be very easy to forget doing it in the
+ * translator. Doing it here means we don't need a gen_io_end() to
+ * go with gen_io_start().
+ */
+ tcg_gen_st_i32(tcg_constant_i32(0), cpu_env,
+ offsetof(ArchCPU, parent_obj.can_do_io) -
+ offsetof(ArchCPU, env));
}
tcg_temp_free_i32(count);
}
-static inline void gen_tb_end(TranslationBlock *tb, int num_insns)
+static inline void gen_tb_end(const TranslationBlock *tb, int num_insns)
{
if (tb_cflags(tb) & CF_USE_ICOUNT) {
- /* Update the num_insn immediate parameter now that we know
- * the actual insn count. */
- tcg_set_insn_param(icount_start_insn, 1, num_insns);
+ /*
+ * Update the num_insn immediate parameter now that we know
+ * the actual insn count.
+ */
+ tcg_set_insn_param(icount_start_insn, 2,
+ tcgv_i32_arg(tcg_constant_i32(num_insns)));
}
gen_set_label(tcg_ctx->exitreq_label);