191 lines
8.5 KiB
XML
191 lines
8.5 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="BKPT" title="BKPT -- 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="BKPT" />
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</docvars>
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<heading>BKPT</heading>
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<desc>
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<brief>
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<para>Breakpoint</para>
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</brief>
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<authored>
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<para>Breakpoint causes a Breakpoint Instruction exception.</para>
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<para>Breakpoint is always unconditional, even when inside an IT block.</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="BKPT" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="aarch32/instrs/BKPT/A1_A.txt" tworows="1">
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<box hibit="31" width="4" name="cond" usename="1" settings="4" constraint="!= 1111">
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<c colspan="4">!= 1111</c>
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</box>
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<box hibit="27" width="5" 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>1</c>
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<c>0</c>
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</box>
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<box hibit="22" width="2" name="opc" settings="2">
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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="20" settings="1">
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<c>0</c>
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</box>
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<box hibit="19" width="12" name="imm12" usename="1">
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<c colspan="12"></c>
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</box>
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<box hibit="7" width="4" settings="4">
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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>1</c>
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</box>
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<box hibit="3" width="4" name="imm4" usename="1">
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<c colspan="4"></c>
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</box>
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</regdiagram>
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<encoding name="BKPT_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="BKPT" />
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</docvars>
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<asmtemplate><text>BKPT</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text> </text><a>{#}</a><a link="sa_imm_1" hover="16-bit unsigned immediate [0-65535] (field "imm12:imm4")"><imm></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/BKPT/A1_A.txt" mylink="aarch32.instrs.BKPT.A1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">imm16 = imm12:imm4;
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if cond != '1110' then UNPREDICTABLE; // BKPT must be encoded with AL condition</pstext>
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</ps>
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</ps_section>
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<constrained_unpredictables encoding="A1" ps_block="Decode">
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<cu_case>
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<cu_cause>
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<pstext mayhavelinks="1">cond != '1110'</pstext>
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</cu_cause>
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<cu_type constraint="Constraint_UNDEF" />
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<cu_type constraint="Constraint_NOP" />
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<cu_type constraint="Constraint_UNCOND" />
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<cu_type constraint="Constraint_COND" />
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</cu_case>
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</constrained_unpredictables>
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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="BKPT" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="16" psname="aarch32/instrs/BKPT/T1_A.txt">
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<box hibit="31" width="8" settings="8">
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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>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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</box>
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<box hibit="23" width="8" name="imm8" usename="1">
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<c colspan="8"></c>
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</box>
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</regdiagram>
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<encoding name="BKPT_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="BKPT" />
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</docvars>
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<asmtemplate><text>BKPT</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text> </text><a>{#}</a><a link="sa_imm" hover="8-bit unsigned immediate [0-255] (field "imm8")"><imm></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/BKPT/T1_A.txt" mylink="aarch32.instrs.BKPT.T1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">imm16 = <a link="impl-shared.ZeroExtend.2" file="shared_pseudocode.xml" hover="function: bits(N) ZeroExtend(bits(M) x, integer N)">ZeroExtend</a>(imm8, 16);</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="BKPT_A1, BKPT_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>. A <instruction>BKPT</instruction> instruction must be unconditional.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="BKPT_A1" symboldefcount="1">
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<symbol link="sa_imm_1"><imm></symbol>
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<account encodedin="imm12:imm4">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="isa" value="A32" />
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</docvars>
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<intro>
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<para>For encoding A1: is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm12:imm4" field. This value:</para>
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<list type="unordered">
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<listitem><content>Is recorded in the Comment field of ESR_ELx.ISS if the Software Breakpoint Instruction exception is taken to an exception level that is using AArch64.</content></listitem>
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<listitem><content>Is ignored otherwise.</content></listitem>
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</list>
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</intro>
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</account>
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</explanation>
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<explanation enclist="BKPT_T1" symboldefcount="2">
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<symbol link="sa_imm"><imm></symbol>
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<account encodedin="imm8">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="isa" value="T32" />
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</docvars>
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<intro>
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<para>For encoding T1: is a 8-bit unsigned immediate, in the range 0 to 255, encoded in the "imm8" field. This value:</para>
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<list type="unordered">
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<listitem><content>Is recorded in the Comment field of ESR_ELx.ISS if the Software Breakpoint Instruction exception is taken to an exception level that is using AArch64.</content></listitem>
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<listitem><content>Is ignored otherwise.</content></listitem>
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</list>
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</intro>
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</account>
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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/BKPT/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.SoftwareBreakpoint.1" file="shared_pseudocode.xml" hover="function: AArch32.SoftwareBreakpoint(bits(16) immediate)">AArch32.SoftwareBreakpoint</a>(imm16);</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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