mio
7f48b1dd4a
This hack was introduced in issue#287 which later becomes endless maintainance pain. ===== Our previous check_exit_request use `brcond` in the middle of a TranslationBlock which breaks the assumptions and thus a hack to liveness_pass_1 is used for _all_ brcond instructions which causes issues for MIPS and many other scenarios. ===== This patch also resolves PC not sync-ed when no memory hooks are installed, finally. Now Unicorn will always have correct PC no matter what happens.
64 lines
2.0 KiB
C
64 lines
2.0 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_ptr puc = tcg_const_ptr(tcg_ctx, tcg_ctx->uc);
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TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 0);
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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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tcg_gen_mov_i32(tcg_ctx, tmp, tcg_ctx->delay_slot_flag);
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}
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gen_helper_check_exit_request(tcg_ctx, puc, tmp);
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tcg_temp_free_i32(tcg_ctx, tmp);
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tcg_temp_free_ptr(tcg_ctx, puc);
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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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tcg_gen_exit_tb(tcg_ctx, tb, TB_EXIT_REQUESTED);
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}
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#endif
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