| <html lang="en"> |
| <head> |
| <title>Varying Target Capabilities - Debugging with GDB</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Debugging with GDB"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Agent-Expressions.html#Agent-Expressions" title="Agent Expressions"> |
| <link rel="prev" href="Using-Agent-Expressions.html#Using-Agent-Expressions" title="Using Agent Expressions"> |
| <link rel="next" href="Rationale.html#Rationale" title="Rationale"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
| 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 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.''--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Varying-Target-Capabilities"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Rationale.html#Rationale">Rationale</a>, |
| Previous: <a rel="previous" accesskey="p" href="Using-Agent-Expressions.html#Using-Agent-Expressions">Using Agent Expressions</a>, |
| Up: <a rel="up" accesskey="u" href="Agent-Expressions.html#Agent-Expressions">Agent Expressions</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">E.4 Varying Target Capabilities</h3> |
| |
| <p>Some targets don't support floating-point, and some would rather not |
| have to deal with <code>long long</code> operations. Also, different targets |
| will have different stack sizes, and different bytecode buffer lengths. |
| |
| <p>Thus, GDB needs a way to ask the target about itself. We haven't worked |
| out the details yet, but in general, GDB should be able to send the |
| target a packet asking it to describe itself. The reply should be a |
| packet whose length is explicit, so we can add new information to the |
| packet in future revisions of the agent, without confusing old versions |
| of GDB, and it should contain a version number. It should contain at |
| least the following information: |
| |
| <ul> |
| <li>whether floating point is supported |
| |
| <li>whether <code>long long</code> is supported |
| |
| <li>maximum acceptable size of bytecode stack |
| |
| <li>maximum acceptable length of bytecode expressions |
| |
| <li>which registers are actually available for collection |
| |
| <li>whether the target supports disabled tracepoints |
| |
| </ul> |
| |
| </body></html> |
| |
