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dcb8e75870
Instead of using -1 as end of chain, use 0, and link through the 0 entry as a fully circular double-linked list. Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
80 lines
2.3 KiB
C
80 lines
2.3 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 int icount_start_insn_idx;
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static TCGLabel *icount_label;
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static TCGLabel *exitreq_label;
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static inline void gen_tb_start(TranslationBlock *tb)
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{
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TCGv_i32 count, flag, imm;
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exitreq_label = gen_new_label();
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flag = tcg_temp_new_i32();
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tcg_gen_ld_i32(flag, cpu_env,
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offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
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tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label);
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tcg_temp_free_i32(flag);
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if (!(tb->cflags & CF_USE_ICOUNT)) {
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return;
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}
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icount_label = gen_new_label();
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count = tcg_temp_local_new_i32();
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tcg_gen_ld_i32(count, cpu_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
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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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icount_start_insn_idx = tcg_op_buf_count();
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tcg_gen_movi_i32(imm, 0xdeadbeef);
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tcg_gen_sub_i32(count, count, imm);
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tcg_temp_free_i32(imm);
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tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
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tcg_gen_st16_i32(count, cpu_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
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tcg_temp_free_i32(count);
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}
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static void gen_tb_end(TranslationBlock *tb, int num_insns)
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{
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gen_set_label(exitreq_label);
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tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
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if (tb->cflags & 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_idx, 1, num_insns);
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gen_set_label(icount_label);
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tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
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}
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/* Terminate the linked list. */
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tcg_ctx.gen_op_buf[tcg_ctx.gen_op_buf[0].prev].next = 0;
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}
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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, -ENV_OFFSET + offsetof(CPUState, can_do_io));
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tcg_temp_free_i32(tmp);
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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, -ENV_OFFSET + offsetof(CPUState, can_do_io));
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tcg_temp_free_i32(tmp);
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}
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#endif
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