| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- Copyright (C) 1988-2015 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 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>Debugging with GDB: Registering Code</title> |
| |
| <meta name="description" content="Debugging with GDB: Registering Code"> |
| <meta name="keywords" content="Debugging with GDB: Registering Code"> |
| <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="JIT-Interface.html#JIT-Interface" rel="up" title="JIT Interface"> |
| <link href="Unregistering-Code.html#Unregistering-Code" rel="next" title="Unregistering Code"> |
| <link href="Declarations.html#Declarations" rel="prev" title="Declarations"> |
| <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="Registering-Code"></a> |
| <div class="header"> |
| <p> |
| Next: <a href="Unregistering-Code.html#Unregistering-Code" accesskey="n" rel="next">Unregistering Code</a>, Previous: <a href="Declarations.html#Declarations" accesskey="p" rel="prev">Declarations</a>, Up: <a href="JIT-Interface.html#JIT-Interface" accesskey="u" rel="up">JIT Interface</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="Registering-Code-1"></a> |
| <h3 class="section">29.2 Registering Code</h3> |
| |
| <p>To register code with <small>GDB</small>, the JIT should follow this protocol: |
| </p> |
| <ul> |
| <li> Generate an object file in memory with symbols and other desired debug |
| information. The file must include the virtual addresses of the sections. |
| |
| </li><li> Create a code entry for the file, which gives the start and size of the symbol |
| file. |
| |
| </li><li> Add it to the linked list in the JIT descriptor. |
| |
| </li><li> Point the relevant_entry field of the descriptor at the entry. |
| |
| </li><li> Set <code>action_flag</code> to <code>JIT_REGISTER</code> and call |
| <code>__jit_debug_register_code</code>. |
| </li></ul> |
| |
| <p>When <small>GDB</small> is attached and the breakpoint fires, <small>GDB</small> uses the |
| <code>relevant_entry</code> pointer so it doesn’t have to walk the list looking for |
| new code. However, the linked list must still be maintained in order to allow |
| <small>GDB</small> to attach to a running process and still find the symbol files. |
| </p> |
| |
| |
| |
| </body> |
| </html> |
