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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Section 12.1</TITLE></HEAD><BODY><B>up:</B> <A HREF="c12.htm">Chapter 12 -- Debugging</A><BR><B>prev:</B> <A HREF="c12.htm">Chapter 12 -- Debugging</A><BR> <B>next:</B> <A HREF="s12_02.htm">12.2 Debug Registers</A><P><HR><P><H1>12.1 Debugging Features of the Architecture</H1>The features of the 80386 architecture that support debugging include:<DL><DT>Reserved debug interrupt vector<DD>Permits processor to automatically invoke a debugger task or procedure whenan event occurs that is of interest to the debugger.<DT>Four debug address registers<DD>Permit programmers to specify up to four addresses that the CPU willautomatically monitor.<DT>Debug control register<DD>Allows programmers to selectively enable various debug conditionsassociated with the four debug addresses.<DT>Debug status register<DD>Helps debugger identify condition that caused debug exception.<DT>Trap bit of TSS (T-bit)<DD>Permits monitoring of task switches.<DT>Resume flag (RF) of flags register<DD>Allows an instruction to be restarted after a debug exception withoutimmediately causing another debug exception due to the same condition.<DT>Single-step flag (TF)<DD>Allows complete monitoring of program flow by specifying whether the CPUshould cause a debug exception with the execution of every instruction.<DT>Breakpoint instruction<DD>Permits debugger intervention at any point in program execution and aidsdebugging of debugger programs.<DT>Reserved interrupt vector for breakpoint exception<DD>Permits processor to automatically invoke a handler task or procedure uponencountering a breakpoint instruction.</DL>These features make it possible to invoke a debugger that is either aseparate task or a procedure in the context of the current task. Thedebugger can be invoked under any of the following kinds of conditions:<UL><LI> Task switch to a specific task.<LI> Execution of the breakpoint instruction.<LI> Execution of every instruction.<LI> Execution of any instruction at a given address.<LI> Read or write of a byte, word, or doubleword at any specified address.<LI> Write to a byte, word, or doubleword at any specified address.<LI> Attempt to change a debug register.</UL><P><HR><P><B>up:</B> <A HREF="c12.htm">Chapter 12 -- Debugging</A><BR><B>prev:</B> <A HREF="c12.htm">Chapter 12 -- Debugging</A><BR> <B>next:</B> <A HREF="s12_02.htm">12.2 Debug Registers</A></BODY>⌨️ 快捷键说明
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