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132 lines
6.0 KiB
HTML
132 lines
6.0 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) 1988-2018 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 "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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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>Miscellaneous routines (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Miscellaneous routines (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Miscellaneous routines (GNU Compiler Collection (GCC) Internals)">
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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="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Libgcc.html#Libgcc" rel="up" title="Libgcc">
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<link href="Languages.html#Languages" rel="next" title="Languages">
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<link href="Exception-handling-routines.html#Exception-handling-routines" rel="prev" title="Exception handling routines">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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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="Miscellaneous-routines"></a>
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<div class="header">
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<p>
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Previous: <a href="Exception-handling-routines.html#Exception-handling-routines" accesskey="p" rel="prev">Exception handling routines</a>, Up: <a href="Libgcc.html#Libgcc" accesskey="u" rel="up">Libgcc</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Miscellaneous-runtime-library-routines"></a>
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<h3 class="section">4.6 Miscellaneous runtime library routines</h3>
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<a name="Cache-control-functions"></a>
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<h4 class="subsection">4.6.1 Cache control functions</h4>
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<dl>
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<dt><a name="index-_005f_005fclear_005fcache"></a>Runtime Function: <em>void</em> <strong>__clear_cache</strong> <em>(char *<var>beg</var>, char *<var>end</var>)</em></dt>
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<dd><p>This function clears the instruction cache between <var>beg</var> and <var>end</var>.
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</p></dd></dl>
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<a name="Split-stack-functions-and-variables"></a>
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<h4 class="subsection">4.6.2 Split stack functions and variables</h4>
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<dl>
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<dt><a name="index-_005f_005fsplitstack_005ffind"></a>Runtime Function: <em>void *</em> <strong>__splitstack_find</strong> <em>(void *<var>segment_arg</var>, void *<var>sp</var>, size_t <var>len</var>, void **<var>next_segment</var>, void **<var>next_sp</var>, void **<var>initial_sp</var>)</em></dt>
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<dd><p>When using <samp>-fsplit-stack</samp>, this call may be used to iterate
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over the stack segments. It may be called like this:
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</p><div class="smallexample">
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<pre class="smallexample"> void *next_segment = NULL;
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void *next_sp = NULL;
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void *initial_sp = NULL;
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void *stack;
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size_t stack_size;
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while ((stack = __splitstack_find (next_segment, next_sp,
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&stack_size, &next_segment,
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&next_sp, &initial_sp))
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!= NULL)
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{
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/* Stack segment starts at stack and is
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stack_size bytes long. */
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}
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</pre></div>
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<p>There is no way to iterate over the stack segments of a different
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thread. However, what is permitted is for one thread to call this
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with the <var>segment_arg</var> and <var>sp</var> arguments NULL, to pass
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<var>next_segment</var>, <var>next_sp</var>, and <var>initial_sp</var> to a different
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thread, and then to suspend one way or another. A different thread
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may run the subsequent <code>__splitstack_find</code> iterations. Of
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course, this will only work if the first thread is suspended while the
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second thread is calling <code>__splitstack_find</code>. If not, the second
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thread could be looking at the stack while it is changing, and
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anything could happen.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fmorestack_005fsegments"></a>Variable: <strong>__morestack_segments</strong></dt>
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<dt><a name="index-_005f_005fmorestack_005fcurrent_005fsegment"></a>Variable: <strong>__morestack_current_segment</strong></dt>
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<dt><a name="index-_005f_005fmorestack_005finitial_005fsp"></a>Variable: <strong>__morestack_initial_sp</strong></dt>
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<dd><p>Internal variables used by the <samp>-fsplit-stack</samp> implementation.
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</p></dd></dl>
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</body>
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</html>
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