You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
180 lines
9.4 KiB
HTML
180 lines
9.4 KiB
HTML
4 years ago
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>S/390 System z Built-in Functions - Using the GNU Compiler Collection (GCC)</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Using the GNU Compiler Collection (GCC)">
|
||
|
|
<meta name="generator" content="makeinfo 4.13">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="Target-Builtins.html#Target-Builtins" title="Target Builtins">
|
||
|
|
<link rel="prev" href="RX-Built_002din-Functions.html#RX-Built_002din-Functions" title="RX Built-in Functions">
|
||
|
|
<link rel="next" href="SH-Built_002din-Functions.html#SH-Built_002din-Functions" title="SH Built-in Functions">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
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 ``Funding Free Software'', the Front-Cover
|
||
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
||
|
|
(see below). A copy of the license is included in the section entitled
|
||
|
|
``GNU Free Documentation License''.
|
||
|
|
|
||
|
|
(a) The FSF's Front-Cover Text is:
|
||
|
|
|
||
|
|
A GNU Manual
|
||
|
|
|
||
|
|
(b) The FSF's Back-Cover Text is:
|
||
|
|
|
||
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software. Copies published by the Free Software Foundation raise
|
||
|
|
funds for GNU development.-->
|
||
|
|
<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>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<a name="S%2f390-System-z-Built-in-Functions"></a>
|
||
|
|
<a name="S_002f390-System-z-Built_002din-Functions"></a>
|
||
|
|
<p>
|
||
|
|
Next: <a rel="next" accesskey="n" href="SH-Built_002din-Functions.html#SH-Built_002din-Functions">SH Built-in Functions</a>,
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="RX-Built_002din-Functions.html#RX-Built_002din-Functions">RX Built-in Functions</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="Target-Builtins.html#Target-Builtins">Target Builtins</a>
|
||
|
|
<hr>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h4 class="subsection">6.58.23 S/390 System z Built-in Functions</h4>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: int <b>__builtin_tbegin</b> (<var>void*</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftbegin-4130"></a></var><br>
|
||
|
|
<blockquote><p>Generates the <code>tbegin</code> machine instruction starting a
|
||
|
|
non-constraint hardware transaction. If the parameter is non-NULL the
|
||
|
|
memory area is used to store the transaction diagnostic buffer and
|
||
|
|
will be passed as first operand to <code>tbegin</code>. This buffer can be
|
||
|
|
defined using the <code>struct __htm_tdb</code> C struct defined in
|
||
|
|
<code>htmintrin.h</code> and must reside on a double-word boundary. The
|
||
|
|
second tbegin operand is set to <code>0xff0c</code>. This enables
|
||
|
|
save/restore of all GPRs and disables aborts for FPR and AR
|
||
|
|
manipulations inside the transaction body. The condition code set by
|
||
|
|
the tbegin instruction is returned as integer value. The tbegin
|
||
|
|
instruction by definition overwrites the content of all FPRs. The
|
||
|
|
compiler will generate code which saves and restores the FPRs. For
|
||
|
|
soft-float code it is recommended to used the <code>*_nofloat</code>
|
||
|
|
variant. In order to prevent a TDB from being written it is required
|
||
|
|
to pass an constant zero value as parameter. Passing the zero value
|
||
|
|
through a variable is not sufficient. Although modifications of
|
||
|
|
access registers inside the transaction will not trigger an
|
||
|
|
transaction abort it is not supported to actually modify them. Access
|
||
|
|
registers do not get saved when entering a transaction. They will have
|
||
|
|
undefined state when reaching the abort code.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<p>Macros for the possible return codes of tbegin are defined in the
|
||
|
|
<code>htmintrin.h</code> header file:
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>_HTM_TBEGIN_STARTED</code><dd><code>tbegin</code> has been executed as part of normal processing. The
|
||
|
|
transaction body is supposed to be executed.
|
||
|
|
<br><dt><code>_HTM_TBEGIN_INDETERMINATE</code><dd>The transaction was aborted due to an indeterminate condition which
|
||
|
|
might be persistent.
|
||
|
|
<br><dt><code>_HTM_TBEGIN_TRANSIENT</code><dd>The transaction aborted due to a transient failure. The transaction
|
||
|
|
should be re-executed in that case.
|
||
|
|
<br><dt><code>_HTM_TBEGIN_PERSISTENT</code><dd>The transaction aborted due to a persistent failure. Re-execution
|
||
|
|
under same circumstances will not be productive.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Macro: <b>_HTM_FIRST_USER_ABORT_CODE</b><var><a name="index-g_t_005fHTM_005fFIRST_005fUSER_005fABORT_005fCODE-4131"></a></var><br>
|
||
|
|
<blockquote><p>The <code>_HTM_FIRST_USER_ABORT_CODE</code> defined in <code>htmintrin.h</code>
|
||
|
|
specifies the first abort code which can be used for
|
||
|
|
<code>__builtin_tabort</code>. Values below this threshold are reserved for
|
||
|
|
machine use.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Data type: <b>struct __htm_tdb</b><var><a name="index-struct-_005f_005fhtm_005ftdb-4132"></a></var><br>
|
||
|
|
<blockquote><p>The <code>struct __htm_tdb</code> defined in <code>htmintrin.h</code> describes
|
||
|
|
the structure of the transaction diagnostic block as specified in the
|
||
|
|
Principles of Operation manual chapter 5-91.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: int <b>__builtin_tbegin_nofloat</b> (<var>void*</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftbegin_005fnofloat-4133"></a></var><br>
|
||
|
|
<blockquote><p>Same as <code>__builtin_tbegin</code> but without FPR saves and restores.
|
||
|
|
Using this variant in code making use of FPRs will leave the FPRs in
|
||
|
|
undefined state when entering the transaction abort handler code.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: int <b>__builtin_tbegin_retry</b> (<var>void*, int</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftbegin_005fretry-4134"></a></var><br>
|
||
|
|
<blockquote><p>In addition to <code>__builtin_tbegin</code> a loop for transient failures
|
||
|
|
is generated. If tbegin returns a condition code of 2 the transaction
|
||
|
|
will be retried as often as specified in the second argument. The
|
||
|
|
perform processor assist instruction is used to tell the CPU about the
|
||
|
|
number of fails so far.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: int <b>__builtin_tbegin_retry_nofloat</b> (<var>void*, int</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftbegin_005fretry_005fnofloat-4135"></a></var><br>
|
||
|
|
<blockquote><p>Same as <code>__builtin_tbegin_retry</code> but without FPR saves and
|
||
|
|
restores. Using this variant in code making use of FPRs will leave
|
||
|
|
the FPRs in undefined state when entering the transaction abort
|
||
|
|
handler code.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: void <b>__builtin_tbeginc</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftbeginc-4136"></a></var><br>
|
||
|
|
<blockquote><p>Generates the <code>tbeginc</code> machine instruction starting a constraint
|
||
|
|
hardware transaction. The second operand is set to <code>0xff08</code>.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: int <b>__builtin_tend</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftend-4137"></a></var><br>
|
||
|
|
<blockquote><p>Generates the <code>tend</code> machine instruction finishing a transaction
|
||
|
|
and making the changes visible to other threads. The condition code
|
||
|
|
generated by tend is returned as integer value.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: void <b>__builtin_tabort</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftabort-4138"></a></var><br>
|
||
|
|
<blockquote><p>Generates the <code>tabort</code> machine instruction with the specified
|
||
|
|
abort code. Abort codes from 0 through 255 are reserved and will
|
||
|
|
result in an error message.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: void <b>__builtin_tx_assist</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftx_005fassist-4139"></a></var><br>
|
||
|
|
<blockquote><p>Generates the <code>ppa rX,rY,1</code> machine instruction. Where the
|
||
|
|
integer parameter is loaded into rX and a value of zero is loaded into
|
||
|
|
rY. The integer parameter specifies the number of times the
|
||
|
|
transaction repeatedly aborted.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: int <b>__builtin_tx_nesting_depth</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005ftx_005fnesting_005fdepth-4140"></a></var><br>
|
||
|
|
<blockquote><p>Generates the <code>etnd</code> machine instruction. The current nesting
|
||
|
|
depth is returned as integer value. For a nesting depth of 0 the code
|
||
|
|
is not executed as part of an transaction.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
<div class="defun">
|
||
|
|
— Built-in Function: void <b>__builtin_non_tx_store</b> (<var>uint64_t *, uint64_t</var>)<var><a name="index-g_t_005f_005fbuiltin_005fnon_005ftx_005fstore-4141"></a></var><br>
|
||
|
|
<blockquote>
|
||
|
|
<p>Generates the <code>ntstg</code> machine instruction. The second argument
|
||
|
|
is written to the first arguments location. The store operation will
|
||
|
|
not be rolled-back in case of an transaction abort.
|
||
|
|
</p></blockquote></div>
|
||
|
|
|
||
|
|
</body></html>
|
||
|
|
|