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<title>Debugging with GDB: ARM</title>
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<a name="ARM"></a>
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Next: <a href="BPF.html#BPF" accesskey="n" rel="next">BPF</a>, Previous: <a href="ARC.html#ARC" accesskey="p" rel="previous">ARC</a>, Up: <a href="Embedded-Processors.html#Embedded-Processors" accesskey="u" rel="up">Embedded Processors</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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<a name="ARM-1"></a>
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<h4 class="subsection">21.3.2 ARM</h4>
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<p><small>GDB</small> provides the following ARM-specific commands:
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</p>
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<dl compact="compact">
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<dt><code>set arm disassembler</code></dt>
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<dd><a name="index-set-arm"></a>
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<p>This commands selects from a list of disassembly styles. The
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<code>"std"</code> style is the standard style.
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</p>
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</dd>
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<dt><code>show arm disassembler</code></dt>
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<dd><a name="index-show-arm"></a>
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<p>Show the current disassembly style.
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</p>
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</dd>
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<dt><code>set arm apcs32</code></dt>
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<dd><a name="index-ARM-32_002dbit-mode"></a>
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<p>This command toggles ARM operation mode between 32-bit and 26-bit.
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</p>
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</dd>
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<dt><code>show arm apcs32</code></dt>
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<dd><p>Display the current usage of the ARM 32-bit mode.
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</p>
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</dd>
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<dt><code>set arm fpu <var>fputype</var></code></dt>
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<dd><p>This command sets the ARM floating-point unit (FPU) type. The
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argument <var>fputype</var> can be one of these:
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</p>
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<dl compact="compact">
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<dt><code>auto</code></dt>
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<dd><p>Determine the FPU type by querying the OS ABI.
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</p></dd>
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<dt><code>softfpa</code></dt>
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<dd><p>Software FPU, with mixed-endian doubles on little-endian ARM
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processors.
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</p></dd>
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<dt><code>fpa</code></dt>
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<dd><p>GCC-compiled FPA co-processor.
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</p></dd>
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<dt><code>softvfp</code></dt>
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<dd><p>Software FPU with pure-endian doubles.
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</p></dd>
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<dt><code>vfp</code></dt>
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<dd><p>VFP co-processor.
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</p></dd>
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</dl>
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</dd>
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<dt><code>show arm fpu</code></dt>
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<dd><p>Show the current type of the FPU.
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</p>
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</dd>
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<dt><code>set arm abi</code></dt>
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<dd><p>This command forces <small>GDB</small> to use the specified ABI.
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</p>
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</dd>
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<dt><code>show arm abi</code></dt>
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<dd><p>Show the currently used ABI.
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</p>
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</dd>
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<dt><code>set arm fallback-mode (arm|thumb|auto)</code></dt>
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<dd><p><small>GDB</small> uses the symbol table, when available, to determine
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whether instructions are ARM or Thumb. This command controls
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<small>GDB</small>’s default behavior when the symbol table is not
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available. The default is ‘<samp>auto</samp>’, which causes <small>GDB</small> to
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use the current execution mode (from the <code>T</code> bit in the <code>CPSR</code>
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register).
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</p>
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</dd>
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<dt><code>show arm fallback-mode</code></dt>
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<dd><p>Show the current fallback instruction mode.
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</p>
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</dd>
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<dt><code>set arm force-mode (arm|thumb|auto)</code></dt>
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<dd><p>This command overrides use of the symbol table to determine whether
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instructions are ARM or Thumb. The default is ‘<samp>auto</samp>’, which
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causes <small>GDB</small> to use the symbol table and then the setting
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of ‘<samp>set arm fallback-mode</samp>’.
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</p>
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</dd>
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<dt><code>show arm force-mode</code></dt>
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<dd><p>Show the current forced instruction mode.
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</p>
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</dd>
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<dt><code>set debug arm</code></dt>
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<dd><p>Toggle whether to display ARM-specific debugging messages from the ARM
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target support subsystem.
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</p>
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</dd>
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<dt><code>show debug arm</code></dt>
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<dd><p>Show whether ARM-specific debugging messages are enabled.
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</p></dd>
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</dl>
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<dl compact="compact">
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<dt><code>target sim <span class="roman">[</span><var>simargs</var><span class="roman">]</span> …</code></dt>
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<dd><p>The <small>GDB</small> ARM simulator accepts the following optional arguments.
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</p>
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<dl compact="compact">
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<dt><code>--swi-support=<var>type</var></code></dt>
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<dd><p>Tell the simulator which SWI interfaces to support. The argument
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<var>type</var> may be a comma separated list of the following values.
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The default value is <code>all</code>.
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</p>
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<dl compact="compact">
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<dt><code>none</code></dt>
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<dt><code>demon</code></dt>
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<dt><code>angel</code></dt>
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<dt><code>redboot</code></dt>
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<dt><code>all</code></dt>
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</dl>
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</dd>
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</dl>
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</dd>
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</dl>
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<div class="header">
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<p>
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Next: <a href="BPF.html#BPF" accesskey="n" rel="next">BPF</a>, Previous: <a href="ARC.html#ARC" accesskey="p" rel="previous">ARC</a>, Up: <a href="Embedded-Processors.html#Embedded-Processors" accesskey="u" rel="up">Embedded Processors</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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