86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
#ifndef GEN_ICOUNT_H
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#define GEN_ICOUNT_H
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#include "qemu/timer.h"
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/* Helpers for instruction counting code generation. */
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static TCGOp *icount_start_insn;
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static inline void gen_io_start(void)
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{
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TCGv_i32 tmp = tcg_const_i32(1);
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tcg_gen_st_i32(tmp, cpu_env,
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offsetof(ArchCPU, parent_obj.can_do_io) -
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offsetof(ArchCPU, env));
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tcg_temp_free_i32(tmp);
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}
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/*
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* cpu->can_do_io is cleared automatically at the beginning of
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* each translation block. The cost is minimal and only paid
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* for -icount, plus it would be very easy to forget doing it
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* in the translator. Therefore, backends only need to call
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* gen_io_start.
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*/
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static inline void gen_io_end(void)
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{
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TCGv_i32 tmp = tcg_const_i32(0);
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tcg_gen_st_i32(tmp, cpu_env,
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offsetof(ArchCPU, parent_obj.can_do_io) -
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offsetof(ArchCPU, env));
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tcg_temp_free_i32(tmp);
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}
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static inline void gen_tb_start(TranslationBlock *tb)
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{
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TCGv_i32 count, imm;
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tcg_ctx->exitreq_label = gen_new_label();
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if (tb_cflags(tb) & CF_USE_ICOUNT) {
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count = tcg_temp_local_new_i32();
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} else {
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count = tcg_temp_new_i32();
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}
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tcg_gen_ld_i32(count, cpu_env,
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offsetof(ArchCPU, neg.icount_decr.u32) -
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offsetof(ArchCPU, env));
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if (tb_cflags(tb) & CF_USE_ICOUNT) {
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imm = tcg_temp_new_i32();
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/* We emit a movi with a dummy immediate argument. Keep the insn index
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* of the movi so that we later (when we know the actual insn count)
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* can update the immediate argument with the actual insn count. */
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tcg_gen_movi_i32(imm, 0xdeadbeef);
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icount_start_insn = tcg_last_op();
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tcg_gen_sub_i32(count, count, imm);
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tcg_temp_free_i32(imm);
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}
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tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, tcg_ctx->exitreq_label);
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if (tb_cflags(tb) & CF_USE_ICOUNT) {
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tcg_gen_st16_i32(count, cpu_env,
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offsetof(ArchCPU, neg.icount_decr.u16.low) -
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offsetof(ArchCPU, env));
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gen_io_end();
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}
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tcg_temp_free_i32(count);
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}
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static inline void gen_tb_end(TranslationBlock *tb, int num_insns)
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{
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if (tb_cflags(tb) & CF_USE_ICOUNT) {
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/* Update the num_insn immediate parameter now that we know
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* the actual insn count. */
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tcg_set_insn_param(icount_start_insn, 1, num_insns);
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}
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gen_set_label(tcg_ctx->exitreq_label);
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tcg_gen_exit_tb(tb, TB_EXIT_REQUESTED);
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}
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#endif
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