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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gdb/Overlay-Commands.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gdb/Overlay-Commands.html b/share/doc/gdb/Overlay-Commands.html new file mode 100644 index 0000000..4c1ee87 --- /dev/null +++ b/share/doc/gdb/Overlay-Commands.html @@ -0,0 +1,202 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Overlay Commands</title> + +<meta name="description" content="Debugging with GDB: Overlay Commands"> +<meta name="keywords" content="Debugging with GDB: Overlay Commands"> +<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="Overlays.html#Overlays" rel="up" title="Overlays"> +<link href="Automatic-Overlay-Debugging.html#Automatic-Overlay-Debugging" rel="next" title="Automatic Overlay Debugging"> +<link href="How-Overlays-Work.html#How-Overlays-Work" rel="previous" title="How Overlays Work"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Overlay-Commands"></a> +<div class="header"> +<p> +Next: <a href="Automatic-Overlay-Debugging.html#Automatic-Overlay-Debugging" accesskey="n" rel="next">Automatic Overlay Debugging</a>, Previous: <a href="How-Overlays-Work.html#How-Overlays-Work" accesskey="p" rel="previous">How Overlays Work</a>, Up: <a href="Overlays.html#Overlays" accesskey="u" rel="up">Overlays</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="Overlay-Commands-1"></a> +<h3 class="section">14.2 Overlay Commands</h3> + +<p>To use <small>GDB</small>’s overlay support, each overlay in your program must +correspond to a separate section of the executable file. The section’s +virtual memory address and load memory address must be the overlay’s +mapped and load addresses. Identifying overlays with sections allows +<small>GDB</small> to determine the appropriate address of a function or +variable, depending on whether the overlay is mapped or not. +</p> +<p><small>GDB</small>’s overlay commands all start with the word <code>overlay</code>; +you can abbreviate this as <code>ov</code> or <code>ovly</code>. The commands are: +</p> +<dl compact="compact"> +<dt><code>overlay off</code></dt> +<dd><a name="index-overlay"></a> +<p>Disable <small>GDB</small>’s overlay support. When overlay support is +disabled, <small>GDB</small> assumes that all functions and variables are +always present at their mapped addresses. By default, <small>GDB</small>’s +overlay support is disabled. +</p> +</dd> +<dt><code>overlay manual</code></dt> +<dd><a name="index-manual-overlay-debugging"></a> +<p>Enable <em>manual</em> overlay debugging. In this mode, <small>GDB</small> +relies on you to tell it which overlays are mapped, and which are not, +using the <code>overlay map-overlay</code> and <code>overlay unmap-overlay</code> +commands described below. +</p> +</dd> +<dt><code>overlay map-overlay <var>overlay</var></code></dt> +<dt><code>overlay map <var>overlay</var></code></dt> +<dd><a name="index-map-an-overlay"></a> +<p>Tell <small>GDB</small> that <var>overlay</var> is now mapped; <var>overlay</var> must +be the name of the object file section containing the overlay. When an +overlay is mapped, <small>GDB</small> assumes it can find the overlay’s +functions and variables at their mapped addresses. <small>GDB</small> assumes +that any other overlays whose mapped ranges overlap that of +<var>overlay</var> are now unmapped. +</p> +</dd> +<dt><code>overlay unmap-overlay <var>overlay</var></code></dt> +<dt><code>overlay unmap <var>overlay</var></code></dt> +<dd><a name="index-unmap-an-overlay"></a> +<p>Tell <small>GDB</small> that <var>overlay</var> is no longer mapped; <var>overlay</var> +must be the name of the object file section containing the overlay. +When an overlay is unmapped, <small>GDB</small> assumes it can find the +overlay’s functions and variables at their load addresses. +</p> +</dd> +<dt><code>overlay auto</code></dt> +<dd><p>Enable <em>automatic</em> overlay debugging. In this mode, <small>GDB</small> +consults a data structure the overlay manager maintains in the inferior +to see which overlays are mapped. For details, see <a href="Automatic-Overlay-Debugging.html#Automatic-Overlay-Debugging">Automatic Overlay Debugging</a>. +</p> +</dd> +<dt><code>overlay load-target</code></dt> +<dt><code>overlay load</code></dt> +<dd><a name="index-reloading-the-overlay-table"></a> +<p>Re-read the overlay table from the inferior. Normally, <small>GDB</small> +re-reads the table <small>GDB</small> automatically each time the inferior +stops, so this command should only be necessary if you have changed the +overlay mapping yourself using <small>GDB</small>. This command is only +useful when using automatic overlay debugging. +</p> +</dd> +<dt><code>overlay list-overlays</code></dt> +<dt><code>overlay list</code></dt> +<dd><a name="index-listing-mapped-overlays"></a> +<p>Display a list of the overlays currently mapped, along with their mapped +addresses, load addresses, and sizes. +</p> +</dd> +</dl> + +<p>Normally, when <small>GDB</small> prints a code address, it includes the name +of the function the address falls in: +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) print main +$3 = {int ()} 0x11a0 <main> +</pre></div> +<p>When overlay debugging is enabled, <small>GDB</small> recognizes code in +unmapped overlays, and prints the names of unmapped functions with +asterisks around them. For example, if <code>foo</code> is a function in an +unmapped overlay, <small>GDB</small> prints it this way: +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) overlay list +No sections are mapped. +(gdb) print foo +$5 = {int (int)} 0x100000 <*foo*> +</pre></div> +<p>When <code>foo</code>’s overlay is mapped, <small>GDB</small> prints the function’s +name normally: +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) overlay list +Section .ov.foo.text, loaded at 0x100000 - 0x100034, + mapped at 0x1016 - 0x104a +(gdb) print foo +$6 = {int (int)} 0x1016 <foo> +</pre></div> + +<p>When overlay debugging is enabled, <small>GDB</small> can find the correct +address for functions and variables in an overlay, whether or not the +overlay is mapped. This allows most <small>GDB</small> commands, like +<code>break</code> and <code>disassemble</code>, to work normally, even on unmapped +code. However, <small>GDB</small>’s breakpoint support has some limitations: +</p> +<ul> +<li> <a name="index-breakpoints-in-overlays"></a> +<a name="index-overlays_002c-setting-breakpoints-in"></a> +You can set breakpoints in functions in unmapped overlays, as long as +<small>GDB</small> can write to the overlay at its load address. +</li><li> <small>GDB</small> can not set hardware or simulator-based breakpoints in +unmapped overlays. However, if you set a breakpoint at the end of your +overlay manager (and tell <small>GDB</small> which overlays are now mapped, if +you are using manual overlay management), <small>GDB</small> will re-set its +breakpoints properly. +</li></ul> + + +<hr> +<div class="header"> +<p> +Next: <a href="Automatic-Overlay-Debugging.html#Automatic-Overlay-Debugging" accesskey="n" rel="next">Automatic Overlay Debugging</a>, Previous: <a href="How-Overlays-Work.html#How-Overlays-Work" accesskey="p" rel="previous">How Overlays Work</a>, Up: <a href="Overlays.html#Overlays" accesskey="u" rel="up">Overlays</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> |