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diff --git a/share/doc/gdb/Overlay-Sample-Program.html b/share/doc/gdb/Overlay-Sample-Program.html new file mode 100644 index 0000000..1409f63 --- /dev/null +++ b/share/doc/gdb/Overlay-Sample-Program.html @@ -0,0 +1,130 @@ +<!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 Sample Program</title> + +<meta name="description" content="Debugging with GDB: Overlay Sample Program"> +<meta name="keywords" content="Debugging with GDB: Overlay Sample Program"> +<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="Languages.html#Languages" rel="next" title="Languages"> +<link href="Automatic-Overlay-Debugging.html#Automatic-Overlay-Debugging" rel="previous" title="Automatic Overlay Debugging"> +<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-Sample-Program"></a> +<div class="header"> +<p> +Previous: <a href="Automatic-Overlay-Debugging.html#Automatic-Overlay-Debugging" accesskey="p" rel="previous">Automatic Overlay Debugging</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-Sample-Program-1"></a> +<h3 class="section">14.4 Overlay Sample Program</h3> +<a name="index-overlay-example-program"></a> + +<p>When linking a program which uses overlays, you must place the overlays +at their load addresses, while relocating them to run at their mapped +addresses. To do this, you must write a linker script (see <a href="http://sourceware.org/binutils/docs/ld/Overlay-Description.html#Overlay-Description">Overlay +Description</a> in <cite>Using ld: the GNU linker</cite>). Unfortunately, +since linker scripts are specific to a particular host system, target +architecture, and target memory layout, this manual cannot provide +portable sample code demonstrating <small>GDB</small>’s overlay support. +</p> +<p>However, the <small>GDB</small> source distribution does contain an overlaid +program, with linker scripts for a few systems, as part of its test +suite. The program consists of the following files from +<samp>gdb/testsuite/gdb.base</samp>: +</p> +<dl compact="compact"> +<dt><samp>overlays.c</samp></dt> +<dd><p>The main program file. +</p></dd> +<dt><samp>ovlymgr.c</samp></dt> +<dd><p>A simple overlay manager, used by <samp>overlays.c</samp>. +</p></dd> +<dt><samp>foo.c</samp></dt> +<dt><samp>bar.c</samp></dt> +<dt><samp>baz.c</samp></dt> +<dt><samp>grbx.c</samp></dt> +<dd><p>Overlay modules, loaded and used by <samp>overlays.c</samp>. +</p></dd> +<dt><samp>d10v.ld</samp></dt> +<dt><samp>m32r.ld</samp></dt> +<dd><p>Linker scripts for linking the test program on the <code>d10v-elf</code> +and <code>m32r-elf</code> targets. +</p></dd> +</dl> + +<p>You can build the test program using the <code>d10v-elf</code> GCC +cross-compiler like this: +</p> +<div class="smallexample"> +<pre class="smallexample">$ d10v-elf-gcc -g -c overlays.c +$ d10v-elf-gcc -g -c ovlymgr.c +$ d10v-elf-gcc -g -c foo.c +$ d10v-elf-gcc -g -c bar.c +$ d10v-elf-gcc -g -c baz.c +$ d10v-elf-gcc -g -c grbx.c +$ d10v-elf-gcc -g overlays.o ovlymgr.o foo.o bar.o \ + baz.o grbx.o -Wl,-Td10v.ld -o overlays +</pre></div> + +<p>The build process is identical for any other architecture, except that +you must substitute the appropriate compiler and linker script for the +target system for <code>d10v-elf-gcc</code> and <code>d10v.ld</code>. +</p> + + + + +</body> +</html> |