You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
6.0 KiB
HTML
133 lines
6.0 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "Free Software" and "Free Software Needs
|
|
Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
|
|
and with the Back-Cover Texts as in (a) below.
|
|
|
|
(a) The FSF's Back-Cover Text is: "You are free to copy and modify
|
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
|
developing GNU and promoting software freedom." -->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Stub Contents (Debugging with GDB)</title>
|
|
|
|
<meta name="description" content="Stub Contents (Debugging with GDB)">
|
|
<meta name="keywords" content="Stub Contents (Debugging with GDB)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Remote-Stub.html#Remote-Stub" rel="up" title="Remote Stub">
|
|
<link href="Bootstrapping.html#Bootstrapping" rel="next" title="Bootstrapping">
|
|
<link href="Remote-Stub.html#Remote-Stub" rel="prev" title="Remote Stub">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Stub-Contents"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Bootstrapping.html#Bootstrapping" accesskey="n" rel="next">Bootstrapping</a>, Up: <a href="Remote-Stub.html#Remote-Stub" accesskey="u" rel="up">Remote Stub</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<a name="What-the-Stub-Can-Do-for-You"></a>
|
|
<h4 class="subsection">20.5.1 What the Stub Can Do for You</h4>
|
|
|
|
<a name="index-remote-serial-stub"></a>
|
|
<p>The debugging stub for your architecture supplies these three
|
|
subroutines:
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>set_debug_traps</code></dt>
|
|
<dd><a name="index-set_005fdebug_005ftraps"></a>
|
|
<a name="index-remote-serial-stub_002c-initialization"></a>
|
|
<p>This routine arranges for <code>handle_exception</code> to run when your
|
|
program stops. You must call this subroutine explicitly in your
|
|
program’s startup code.
|
|
</p>
|
|
</dd>
|
|
<dt><code>handle_exception</code></dt>
|
|
<dd><a name="index-handle_005fexception"></a>
|
|
<a name="index-remote-serial-stub_002c-main-routine"></a>
|
|
<p>This is the central workhorse, but your program never calls it
|
|
explicitly—the setup code arranges for <code>handle_exception</code> to
|
|
run when a trap is triggered.
|
|
</p>
|
|
<p><code>handle_exception</code> takes control when your program stops during
|
|
execution (for example, on a breakpoint), and mediates communications
|
|
with <small>GDB</small> on the host machine. This is where the communications
|
|
protocol is implemented; <code>handle_exception</code> acts as the <small>GDB</small>
|
|
representative on the target machine. It begins by sending summary
|
|
information on the state of your program, then continues to execute,
|
|
retrieving and transmitting any information <small>GDB</small> needs, until you
|
|
execute a <small>GDB</small> command that makes your program resume; at that point,
|
|
<code>handle_exception</code> returns control to your own code on the target
|
|
machine.
|
|
</p>
|
|
</dd>
|
|
<dt><code>breakpoint</code></dt>
|
|
<dd><a name="index-breakpoint-subroutine_002c-remote"></a>
|
|
<p>Use this auxiliary subroutine to make your program contain a
|
|
breakpoint. Depending on the particular situation, this may be the only
|
|
way for <small>GDB</small> to get control. For instance, if your target
|
|
machine has some sort of interrupt button, you won’t need to call this;
|
|
pressing the interrupt button transfers control to
|
|
<code>handle_exception</code>—in effect, to <small>GDB</small>. On some machines,
|
|
simply receiving characters on the serial port may also trigger a trap;
|
|
again, in that situation, you don’t need to call <code>breakpoint</code> from
|
|
your own program—simply running ‘<samp>target remote</samp>’ from the host
|
|
<small>GDB</small> session gets control.
|
|
</p>
|
|
<p>Call <code>breakpoint</code> if none of these is true, or if you simply want
|
|
to make certain your program stops at a predetermined point for the
|
|
start of your debugging session.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Bootstrapping.html#Bootstrapping" accesskey="n" rel="next">Bootstrapping</a>, Up: <a href="Remote-Stub.html#Remote-Stub" accesskey="u" rel="up">Remote Stub</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|