軟件調試(1) - 斷點簡介

IA結構CPU 提供的調試支持:

INT3 指令 - 斷點指令, 當CPU執行到該指令時便會產生斷點異常以便中斷9到調試器 -> 軟中斷

EFLAGS中的TF標志位: 陷阱標志位,當標志位為1: CPU每執行完一條指令就產生調試異常 -> 單步執行

調試寄存器: DR0~DR7 -> 用於設置硬件斷點和報告調試異常的細節

斷點異常(#BP): 當INT3 指令執行時,產生此異常, CPU將會轉到該異常的處理函數, 他會進一步分發到調試器

調試異常(#DB): 當除INT3 指令以外的調試發生時, 產生此異常

TSS的T標志位:任務陷阱標志,當切換到設置了T標志的任務時,CPU會產生調試異常,中斷到調試器
參考:Windows軟件調試

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