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(Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> - <i class="fa fa-search"></i> - </button> - - </div> - - <h1 class="menu-title">Notes</h1> - - <div class="right-buttons"> - <a href="print.html" title="Print this book" aria-label="Print this book"> - <i id="print-button" class="fa fa-print"></i> - </a> - - </div> - </div> - </div> - - - <div id="search-wrapper" class="hidden"> - <form id="searchbar-outer" class="searchbar-outer"> - <input type="search" name="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> - </form> - <div id="searchresults-outer" class="searchresults-outer hidden"> - <div id="searchresults-header" class="searchresults-header"></div> - <ul id="searchresults"> - </ul> - </div> - </div> - - - <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> - <script type="text/javascript"> - document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); - document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); - Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { - link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); - }); - </script> - - <div id="content" class="content"> - <main> - <h1><a class="header" href="#gdb1" id="gdb1">gdb(1)</a></h1> -<h1><a class="header" href="#cli" id="cli">CLI</a></h1> -<pre><code class="language-markdown"> gdb [opts] [prg [-c coredump | -p pid]] - gdb [opts] --args prg <prg-args> - opts: - -p <pid> attach to pid - -c <coredump> use <coredump> - -x <file> execute script <file> before prompt - -ex <cmd> execute command <cmd> before prompt - --tty <tty> set I/O tty for debugee -</code></pre> -<h1><a class="header" href="#interactive-usage" id="interactive-usage">Interactive usage</a></h1> -<pre><code class="language-markdown"> tty <tty> - Set <tty> as tty for debugee. - Make sure nobody reads from target tty, easiest is to spawn a shell - and run following in target tty: - > while true; do sleep 1024; done - - set follow-fork-mode <child | parent> - Specify which process to follow when debuggee makes a fork(2) - syscall. - - sharedlibrary [<regex>] - Load symbols of shared libs loaded by debugee. Optionally use <regex> - to filter libs for symbol loading. - - break [-qualified] <sym> thread <tnum> - Set a breakpoint only for a specific thread. - -qualified: Tred <sym> as fully qualified symbol (quiet handy to set - breakpoints on C symbols in C++ contexts) - - rbreak <regex> - Set breakpoints matching <regex>, where matching internally is done - on: .*<regex>.* - - command [<bp_list>] - Define commands to run after breakpoint hit. If <bp_list> is not - specified attach command to last created breakpoint. Command block - terminated with 'end' token. - - <bp_list>: Space separates list, eg 'command 2 5-8' to run command - for breakpoints: 2,5,6,7,8. - - info functions [<regex>] - List functions matching <regex>. List all functions if no <regex> - provided. - - info variables [<regex>] - List variables matching <regex>. List all variables if no <regex> - provided. - - info handle [<signal>] - Print how to handle <signal>. If no <signal> specified print for all - signals. - - handle <signal> <action> - Configure how gdb handles <signal> sent to debugee. - <action>: - stop/nostop Catch signal in gdb and break. - print/noprint Print message when gdb catches signal. - pass/nopass Pass signal down to debugee. - - catch signal <signal> - Create a catchpoint for <signal>. -</code></pre> -<h1><a class="header" href="#user-commands-macros" id="user-commands-macros">User commands (macros)</a></h1> -<p>Gdb allows to create & document user commands as follows:</p> -<pre><code class="language-markdown"> define <cmd> - # cmds - end - - document <cmd> - # docu - end -</code></pre> -<p>To get all user commands or documentations one can use:</p> -<pre><code class="language-markdown"> help user-defined - help <cmd> -</code></pre> -<h1><a class="header" href="#hooks" id="hooks">Hooks</a></h1> -<p>Gdb allows to create two types of command <code>hooks</code></p> -<ul> -<li><code>hook-</code> will be run before <code><cmd></code></li> -<li><code>hookpost-</code> will be run after <code><cmd></code></li> -</ul> -<pre><code class="language-markdown"> define hook-<cmd> - # cmds - end - - define hookpost-<cmd> - # cmds - end -</code></pre> -<h1><a class="header" href="#examples" id="examples">Examples</a></h1> -<h2><a class="header" href="#catch-sigsegv-and-execute-commands" id="catch-sigsegv-and-execute-commands">Catch SIGSEGV and execute commands</a></h2> -<p>This creates a <code>catchpoint</code> for the <code>SIGSEGV</code> signal and attached the <code>command</code> -to it.</p> -<pre><code class="language-markdown"> catch signal SIGSEGV - command - bt - c - end -</code></pre> -<h2><a class="header" href="#run-backtrace-on-thread-1-batch-mode" id="run-backtrace-on-thread-1-batch-mode">Run <code>backtrace</code> on thread 1 (batch mode)</a></h2> -<pre><code class="language-markdown"> gdb --batch -ex 'thread 1' -ex 'bt' -p <pid> -</code></pre> -<h2><a class="header" href="#script-gdb-for-automating-debugging-sessions" id="script-gdb-for-automating-debugging-sessions">Script gdb for automating debugging sessions</a></h2> -<p>To script gdb add commands into a file and pass it to gdb via <code>-x</code>. -For example create <code>run.gdb</code>:</p> -<pre><code class="language-markdown"> set pagination off - - break mmap - command - info reg rdi rsi rdx - bt - c - end - - #initial drop - c -</code></pre> -<p>This script can be used as:</p> -<pre><code class="language-markdown"> gdb --batch -x ./run.gdb -p <pid> -</code></pre> -<h1><a class="header" href="#know-bugs" id="know-bugs">Know Bugs</a></h1> -<h2><a class="header" href="#workaround-command--finish-bug" id="workaround-command--finish-bug">Workaround <code>command + finish</code> bug</a></h2> -<p>When using <code>finish</code> inside a <code>command</code> block, commands after <code>finish</code> are not -executed. To workaround that bug one can create a wrapper function which calls -<code>finish</code>.</p> -<pre><code class="language-markdown"> define handler - bt - finish - info reg rax - end - - command - handler - end -</code></pre> - - </main> - - <nav class="nav-wrapper" aria-label="Page navigation"> - <!-- Mobile navigation buttons --> - - <a rel="prev" href="awk.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> - <i class="fa fa-angle-left"></i> - </a> - - - - <a rel="next" href="radare2.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> - <i class="fa fa-angle-right"></i> - </a> - - - <div style="clear: both"></div> - </nav> - </div> - </div> - - <nav class="nav-wide-wrapper" aria-label="Page navigation"> - - <a href="awk.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> - <i class="fa fa-angle-left"></i> - </a> - - - - <a href="radare2.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> - <i class="fa fa-angle-right"></i> - </a> - - </nav> - - </div> - - - - - - - - - <script type="text/javascript"> - window.playpen_copyable = true; - </script> - - - - - - <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> - <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> - <script src="searcher.js" type="text/javascript" charset="utf-8"></script> - - - <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> - <script src="highlight.js" type="text/javascript" charset="utf-8"></script> - <script src="book.js" type="text/javascript" charset="utf-8"></script> - - <!-- Custom JS scripts --> - - - - - </body> -</html> |