76 lines
2.5 KiB
C
76 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 inline void gen_io_start(TCGContext *tcg_ctx)
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{
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TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 1);
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tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->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(tcg_ctx, 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(TCGContext *tcg_ctx)
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{
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TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 0);
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tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->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(tcg_ctx, tmp);
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}
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static inline void gen_tb_start(TCGContext *tcg_ctx, TranslationBlock *tb)
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{
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TCGv_i32 count;
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tcg_ctx->exitreq_label = gen_new_label(tcg_ctx);
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count = tcg_temp_new_i32(tcg_ctx);
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tcg_gen_ld_i32(tcg_ctx, count, tcg_ctx->cpu_env,
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offsetof(ArchCPU, neg.icount_decr.u32) -
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offsetof(ArchCPU, env));
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// Unicorn:
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// We CANT'T use brcondi_i32 here or we will fail liveness analysis
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// because it marks the end of BB
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if (tcg_ctx->delay_slot_flag != NULL) {
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// Initialize delay_slot_flag here
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tcg_gen_movi_i32(tcg_ctx, tcg_ctx->delay_slot_flag, 0);
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TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 0);
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// dest = (c1 cond c2 ? v1 : v2)
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tcg_gen_movcond_i32(tcg_ctx, TCG_COND_GT, count, tcg_ctx->delay_slot_flag, tmp, tcg_ctx->delay_slot_flag, count);
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tcg_temp_free_i32(tcg_ctx, tmp);
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}
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tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_LT, count, 0, tcg_ctx->exitreq_label);
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tcg_temp_free_i32(tcg_ctx, count);
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}
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static inline void gen_tb_end(TCGContext *tcg_ctx, TranslationBlock *tb, int num_insns)
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{
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if (tcg_ctx->delay_slot_flag != NULL){
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tcg_temp_free_i32(tcg_ctx, tcg_ctx->delay_slot_flag);
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}
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tcg_ctx->delay_slot_flag = NULL;
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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(tcg_ctx->icount_start_insn, 1, num_insns);
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}
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gen_set_label(tcg_ctx, tcg_ctx->exitreq_label);
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tcg_gen_exit_tb(tcg_ctx, tb, TB_EXIT_REQUESTED);
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}
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#endif
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