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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/Observer-Mode.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/gdb/Observer-Mode.html b/share/doc/gdb/Observer-Mode.html new file mode 100644 index 0000000..9f469a6 --- /dev/null +++ b/share/doc/gdb/Observer-Mode.html @@ -0,0 +1,192 @@ +<!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: Observer Mode</title> + +<meta name="description" content="Debugging with GDB: Observer Mode"> +<meta name="keywords" content="Debugging with GDB: Observer Mode"> +<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="Thread-Stops.html#Thread-Stops" rel="up" title="Thread Stops"> +<link href="Reverse-Execution.html#Reverse-Execution" rel="next" title="Reverse Execution"> +<link href="Interrupted-System-Calls.html#Interrupted-System-Calls" rel="previous" title="Interrupted System Calls"> +<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="Observer-Mode"></a> +<div class="header"> +<p> +Previous: <a href="Interrupted-System-Calls.html#Interrupted-System-Calls" accesskey="p" rel="previous">Interrupted System Calls</a>, Up: <a href="Thread-Stops.html#Thread-Stops" accesskey="u" rel="up">Thread Stops</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="Observer-Mode-1"></a> +<h4 class="subsection">5.5.6 Observer Mode</h4> + +<p>If you want to build on non-stop mode and observe program behavior +without any chance of disruption by <small>GDB</small>, you can set +variables to disable all of the debugger’s attempts to modify state, +whether by writing memory, inserting breakpoints, etc. These operate +at a low level, intercepting operations from all commands. +</p> +<p>When all of these are set to <code>off</code>, then <small>GDB</small> is said to +be <em>observer mode</em>. As a convenience, the variable +<code>observer</code> can be set to disable these, plus enable non-stop +mode. +</p> +<p>Note that <small>GDB</small> will not prevent you from making nonsensical +combinations of these settings. For instance, if you have enabled +<code>may-insert-breakpoints</code> but disabled <code>may-write-memory</code>, +then breakpoints that work by writing trap instructions into the code +stream will still not be able to be placed. +</p> +<dl compact="compact"> +<dd> +<a name="index-observer"></a> +</dd> +<dt><code>set observer on</code></dt> +<dt><code>set observer off</code></dt> +<dd><p>When set to <code>on</code>, this disables all the permission variables +below (except for <code>insert-fast-tracepoints</code>), plus enables +non-stop debugging. Setting this to <code>off</code> switches back to +normal debugging, though remaining in non-stop mode. +</p> +</dd> +<dt><code>show observer</code></dt> +<dd><p>Show whether observer mode is on or off. +</p> +<a name="index-may_002dwrite_002dregisters"></a> +</dd> +<dt><code>set may-write-registers on</code></dt> +<dt><code>set may-write-registers off</code></dt> +<dd><p>This controls whether <small>GDB</small> will attempt to alter the values of +registers, such as with assignment expressions in <code>print</code>, or the +<code>jump</code> command. It defaults to <code>on</code>. +</p> +</dd> +<dt><code>show may-write-registers</code></dt> +<dd><p>Show the current permission to write registers. +</p> +<a name="index-may_002dwrite_002dmemory"></a> +</dd> +<dt><code>set may-write-memory on</code></dt> +<dt><code>set may-write-memory off</code></dt> +<dd><p>This controls whether <small>GDB</small> will attempt to alter the contents +of memory, such as with assignment expressions in <code>print</code>. It +defaults to <code>on</code>. +</p> +</dd> +<dt><code>show may-write-memory</code></dt> +<dd><p>Show the current permission to write memory. +</p> +<a name="index-may_002dinsert_002dbreakpoints"></a> +</dd> +<dt><code>set may-insert-breakpoints on</code></dt> +<dt><code>set may-insert-breakpoints off</code></dt> +<dd><p>This controls whether <small>GDB</small> will attempt to insert breakpoints. +This affects all breakpoints, including internal breakpoints defined +by <small>GDB</small>. It defaults to <code>on</code>. +</p> +</dd> +<dt><code>show may-insert-breakpoints</code></dt> +<dd><p>Show the current permission to insert breakpoints. +</p> +<a name="index-may_002dinsert_002dtracepoints"></a> +</dd> +<dt><code>set may-insert-tracepoints on</code></dt> +<dt><code>set may-insert-tracepoints off</code></dt> +<dd><p>This controls whether <small>GDB</small> will attempt to insert (regular) +tracepoints at the beginning of a tracing experiment. It affects only +non-fast tracepoints, fast tracepoints being under the control of +<code>may-insert-fast-tracepoints</code>. It defaults to <code>on</code>. +</p> +</dd> +<dt><code>show may-insert-tracepoints</code></dt> +<dd><p>Show the current permission to insert tracepoints. +</p> +<a name="index-may_002dinsert_002dfast_002dtracepoints"></a> +</dd> +<dt><code>set may-insert-fast-tracepoints on</code></dt> +<dt><code>set may-insert-fast-tracepoints off</code></dt> +<dd><p>This controls whether <small>GDB</small> will attempt to insert fast +tracepoints at the beginning of a tracing experiment. It affects only +fast tracepoints, regular (non-fast) tracepoints being under the +control of <code>may-insert-tracepoints</code>. It defaults to <code>on</code>. +</p> +</dd> +<dt><code>show may-insert-fast-tracepoints</code></dt> +<dd><p>Show the current permission to insert fast tracepoints. +</p> +<a name="index-may_002dinterrupt"></a> +</dd> +<dt><code>set may-interrupt on</code></dt> +<dt><code>set may-interrupt off</code></dt> +<dd><p>This controls whether <small>GDB</small> will attempt to interrupt or stop +program execution. When this variable is <code>off</code>, the +<code>interrupt</code> command will have no effect, nor will +<kbd>Ctrl-c</kbd>. It defaults to <code>on</code>. +</p> +</dd> +<dt><code>show may-interrupt</code></dt> +<dd><p>Show the current permission to interrupt or stop the program. +</p> +</dd> +</dl> + +<hr> +<div class="header"> +<p> +Previous: <a href="Interrupted-System-Calls.html#Interrupted-System-Calls" accesskey="p" rel="previous">Interrupted System Calls</a>, Up: <a href="Thread-Stops.html#Thread-Stops" accesskey="u" rel="up">Thread Stops</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> |