void translator_loop(const TranslatorOps *ops, DisasContextBase *db, CPUState *cpu, TranslationBlock *tb) { int max_insns; /* Initialize DisasContext */ db->tb = tb; db->pc_first = tb->pc; db->pc_next = db->pc_first; db->is_jmp = DISAS_NEXT; db->num_insns = 0; db->singlestep_enabled = cpu->singlestep_enabled; /* Instruction counting */ max_insns = db->tb->cflags & CF_COUNT_MASK; if (max_insns == 0) { max_insns = CF_COUNT_MASK; } if (max_insns > TCG_MAX_INSNS) { max_insns = TCG_MAX_INSNS; } if (db->singlestep_enabled || singlestep) { max_insns = 1; } max_insns = ops->init_disas_context(db, cpu, max_insns); tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */ /* Reset the temp count so that we can identify leaks */ tcg_clear_temp_count(); /* Start translating. */ gen_tb_start(db->tb); ops->tb_start(db, cpu); tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */ while (true) { db->num_insns++; ops->insn_start(db, cpu); tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */ /* Pass breakpoint hits to target for further processing */ if (unlikely(!QTAILQ_EMPTY(&cpu->breakpoints))) { CPUBreakpoint *bp; QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) { if (bp->pc == db->pc_next) { if (ops->breakpoint_check(db, cpu, bp)) { break; } } } /* The breakpoint_check hook may use DISAS_TOO_MANY to indicate that only one more instruction is to be executed. Otherwise it should use DISAS_NORETURN when generating an exception, but may use a DISAS_TARGET_* value for Something Else. */ if (db->is_jmp > DISAS_TOO_MANY) { break; } } /* Disassemble one instruction. The translate_insn hook should update db->pc_next and db->is_jmp to indicate what should be done next -- either exiting this loop or locate the start of the next instruction. */ if (db->num_insns == max_insns && (db->tb->cflags & CF_LAST_IO)) { /* Accept I/O on the last instruction. */ gen_io_start(); ops->translate_insn(db, cpu); gen_io_end(); } else { ops->translate_insn(db, cpu); } /* Stop translation if translate_insn so indicated. */ if (db->is_jmp != DISAS_NEXT) { break; } /* Stop translation if the output buffer is full, or we have executed all of the allowed instructions. */ if (tcg_op_buf_full() || db->num_insns >= max_insns) { db->is_jmp = DISAS_TOO_MANY; break; } } /* Emit code to exit the TB, as indicated by db->is_jmp. */ ops->tb_stop(db, cpu); gen_tb_end(db->tb, db->num_insns); /* The disas_log hook may use these values rather than recompute. */ db->tb->size = db->pc_next - db->pc_first; db->tb->icount = db->num_insns; #ifdef DEBUG_DISAS if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM) && qemu_log_in_addr_range(db->pc_first)) { qemu_log_lock(); qemu_log("----------------\n"); ops->disas_log(db, cpu); qemu_log("\n"); qemu_log_unlock(); } #endif }