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