222 lines
8.4 KiB
XML
222 lines
8.4 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<?xml-stylesheet type="text/xsl" encoding="UTF-8" href="iform.xsl" version="1.0"?>
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<!DOCTYPE instructionsection PUBLIC "-//ARM//DTD instructionsection //EN" "iform-p.dtd">
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<!-- Copyright (c) 2010-2022 Arm Limited or its affiliates. All rights reserved. -->
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<!-- This document is Non-Confidential. This document may only be used and distributed in accordance with the terms of the agreement entered into by Arm and the party that Arm delivered this document to. -->
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<instructionsection id="SETEND" title="SETEND -- AArch32" type="instruction">
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<docvars>
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<docvar key="instr-class" value="general" />
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<docvar key="mnemonic" value="SETEND" />
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</docvars>
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<heading>SETEND</heading>
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<desc>
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<brief>
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<para>Set Endianness</para>
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</brief>
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<authored>
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<para>Set Endianness writes a new value to <xref linkend="BEIDIGBH">PSTATE</xref>.E.</para>
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</authored>
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<encodingnotes>
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<para>For more information about the <arm-defined-word>constrained unpredictable</arm-defined-word> behavior of this instruction, see <xref linkend="CJAEGDJC">Architectural Constraints on UNPREDICTABLE behaviors</xref>.</para>
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</encodingnotes>
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</desc>
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<alias_list howmany="0"></alias_list>
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<classes>
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<classesintro count="2">
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<txt>It has encodings from the following instruction sets:</txt>
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<txt> A32 (</txt>
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<a href="#iclass_a1">A1</a>
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<txt>)</txt>
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<txt> and </txt>
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<txt> T32 (</txt>
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<a href="#iclass_t1">T1</a>
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<txt>)</txt>
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<txt>.</txt>
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</classesintro>
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<iclass name="A1" oneof="2" id="iclass_a1" no_encodings="1" isa="A32">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A32" />
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<docvar key="mnemonic" value="SETEND" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="aarch32/instrs/SETEND/A1_A.txt">
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<box hibit="31" width="12" settings="12">
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<c>1</c>
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<c>1</c>
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<c>1</c>
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<c>1</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>1</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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</box>
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<box hibit="19" width="2" name="imod" settings="2">
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<c>(0)</c>
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<c>(0)</c>
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</box>
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<box hibit="17" name="M" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="16" name="op" settings="1">
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<c>1</c>
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</box>
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<box hibit="15" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="14" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="13" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="12" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="11" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="10" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="9" name="E" usename="1">
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<c></c>
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</box>
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<box hibit="8" name="A" settings="1">
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<c>(0)</c>
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</box>
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<box hibit="7" name="I" settings="1">
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<c>0</c>
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</box>
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<box hibit="6" name="F" settings="1">
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<c>0</c>
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</box>
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<box hibit="5" settings="1">
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<c>0</c>
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</box>
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<box hibit="4" width="5" name="mode" settings="5">
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<c>0</c>
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<c>(0)</c>
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<c>(0)</c>
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<c>(0)</c>
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<c>(0)</c>
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</box>
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</regdiagram>
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<encoding name="SETEND_A1" oneofinclass="1" oneof="2" label="A1">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A32" />
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<docvar key="mnemonic" value="SETEND" />
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</docvars>
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<asmtemplate comment="Cannot be conditional"><text>SETEND</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text> </text><a link="sa_endian_specifier" hover="Endianness to be selected, and the value to be set in PSTATE (field "E")"><endian_specifier></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/SETEND/A1_A.txt" mylink="aarch32.instrs.SETEND.A1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">set_bigend = (E == '1');</pstext>
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</ps>
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</ps_section>
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</iclass>
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<iclass name="T1" oneof="2" id="iclass_t1" no_encodings="1" isa="T32">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="T32" />
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<docvar key="mnemonic" value="SETEND" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="16" psname="aarch32/instrs/SETEND/T1_A.txt">
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<box hibit="31" width="10" settings="10">
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<c>1</c>
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<c>0</c>
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<c>1</c>
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<c>1</c>
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<c>0</c>
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<c>1</c>
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<c>1</c>
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<c>0</c>
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<c>0</c>
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<c>1</c>
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</box>
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<box hibit="21" name="op" settings="1">
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<c>0</c>
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</box>
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<box hibit="20" settings="1">
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<c>(1)</c>
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</box>
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<box hibit="19" name="E" usename="1">
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<c></c>
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</box>
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<box hibit="18" width="3" settings="3">
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<c>(0)</c>
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<c>(0)</c>
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<c>(0)</c>
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</box>
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</regdiagram>
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<encoding name="SETEND_T1" oneofinclass="1" oneof="2" label="T1">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="T32" />
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<docvar key="mnemonic" value="SETEND" />
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</docvars>
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<asmtemplate comment="Not permitted in IT block"><text>SETEND</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text> </text><a link="sa_endian_specifier" hover="Endianness to be selected, and the value to be set in PSTATE (field "E")"><endian_specifier></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/SETEND/T1_A.txt" mylink="aarch32.instrs.SETEND.T1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">set_bigend = (E == '1');
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if <a link="impl-aarch32.InITBlock.0" file="shared_pseudocode.xml" hover="function: boolean InITBlock()">InITBlock</a>() then UNPREDICTABLE;</pstext>
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</ps>
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</ps_section>
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</iclass>
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</classes>
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<explanations scope="all">
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<explanation enclist="SETEND_A1, SETEND_T1" symboldefcount="1">
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<symbol link="sa_q"><q></symbol>
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<account encodedin="">
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<intro>
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<para>See <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="SETEND_A1, SETEND_T1" symboldefcount="1">
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<symbol link="sa_endian_specifier"><endian_specifier></symbol>
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<definition encodedin="E">
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<intro>Is the endianness to be selected, and the value to be set in PSTATE.E, </intro>
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<table class="valuetable">
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<tgroup cols="2">
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<thead>
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<row>
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<entry class="bitfield">E</entry>
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<entry class="symbol"><endian_specifier></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry class="bitfield">0</entry>
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<entry class="symbol">LE</entry>
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</row>
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<row>
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<entry class="bitfield">1</entry>
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<entry class="symbol">BE</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</definition>
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</explanation>
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</explanations>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/SETEND/Op_A.txt" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute">EncodingSpecificOperations();
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<a link="AArch32.CheckSETENDEnabled.0" file="shared_pseudocode.xml" hover="function: AArch32.CheckSETENDEnabled()">AArch32.CheckSETENDEnabled</a>();
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PSTATE.E = if set_bigend then '1' else '0';</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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