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104 lines
4.4 KiB
HTML
104 lines
4.4 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Varying Target Capabilities (Debugging with GDB)</title>
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<meta name="description" content="Varying Target Capabilities (Debugging with GDB)">
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<meta name="keywords" content="Varying Target Capabilities (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Agent-Expressions.html#Agent-Expressions" rel="up" title="Agent Expressions">
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<link href="Rationale.html#Rationale" rel="next" title="Rationale">
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<link href="Using-Agent-Expressions.html#Using-Agent-Expressions" rel="prev" title="Using Agent Expressions">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Varying-Target-Capabilities"></a>
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<div class="header">
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<p>
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Next: <a href="Rationale.html#Rationale" accesskey="n" rel="next">Rationale</a>, Previous: <a href="Using-Agent-Expressions.html#Using-Agent-Expressions" accesskey="p" rel="prev">Using Agent Expressions</a>, Up: <a href="Agent-Expressions.html#Agent-Expressions" accesskey="u" rel="up">Agent Expressions</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>
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</div>
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<hr>
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<a name="Varying-Target-Capabilities-1"></a>
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<h3 class="section">F.4 Varying Target Capabilities</h3>
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<p>Some targets don’t support floating-point, and some would rather not
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have to deal with <code>long long</code> operations. Also, different targets
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will have different stack sizes, and different bytecode buffer lengths.
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</p>
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<p>Thus, GDB needs a way to ask the target about itself. We haven’t worked
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out the details yet, but in general, GDB should be able to send the
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target a packet asking it to describe itself. The reply should be a
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packet whose length is explicit, so we can add new information to the
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packet in future revisions of the agent, without confusing old versions
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of GDB, and it should contain a version number. It should contain at
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least the following information:
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</p>
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<ul>
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<li> whether floating point is supported
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</li><li> whether <code>long long</code> is supported
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</li><li> maximum acceptable size of bytecode stack
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</li><li> maximum acceptable length of bytecode expressions
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</li><li> which registers are actually available for collection
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</li><li> whether the target supports disabled tracepoints
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</li></ul>
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</body>
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</html>
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