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<title>ARM - Debugging with GDB</title>
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Next: <a rel="next" accesskey="n" href="M68K.html#M68K">M68K</a>,
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<h4 class="subsection">21.3.2 ARM</h4>
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<p><span class="sc">gdb</span> provides the following ARM-specific commands:
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<dl>
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<dt><code>set arm disassembler</code><dd><a name="index-set-arm-1578"></a>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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<br><dt><code>show arm disassembler</code><dd><a name="index-show-arm-1579"></a>Show the current disassembly style.
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<br><dt><code>set arm apcs32</code><dd><a name="index-ARM-32_002dbit-mode-1580"></a>This command toggles ARM operation mode between 32-bit and 26-bit.
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<br><dt><code>show arm apcs32</code><dd>Display the current usage of the ARM 32-bit mode.
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<br><dt><code>set arm fpu </code><var>fputype</var><dd>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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<dl>
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<dt><code>auto</code><dd>Determine the FPU type by querying the OS ABI.
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<br><dt><code>softfpa</code><dd>Software FPU, with mixed-endian doubles on little-endian ARM
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processors.
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<br><dt><code>fpa</code><dd>GCC-compiled FPA co-processor.
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<br><dt><code>softvfp</code><dd>Software FPU with pure-endian doubles.
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<br><dt><code>vfp</code><dd>VFP co-processor.
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</dl>
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<br><dt><code>show arm fpu</code><dd>Show the current type of the FPU.
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<br><dt><code>set arm abi</code><dd>This command forces <span class="sc">gdb</span> to use the specified ABI.
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<br><dt><code>show arm abi</code><dd>Show the currently used ABI.
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<br><dt><code>set arm fallback-mode (arm|thumb|auto)</code><dd><span class="sc">gdb</span> 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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<span class="sc">gdb</span>'s default behavior when the symbol table is not
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available. The default is ‘<samp><span class="samp">auto</span></samp>’, which causes <span class="sc">gdb</span> 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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<br><dt><code>show arm fallback-mode</code><dd>Show the current fallback instruction mode.
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<br><dt><code>set arm force-mode (arm|thumb|auto)</code><dd>This command overrides use of the symbol table to determine whether
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instructions are ARM or Thumb. The default is ‘<samp><span class="samp">auto</span></samp>’, which
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causes <span class="sc">gdb</span> to use the symbol table and then the setting
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of ‘<samp><span class="samp">set arm fallback-mode</span></samp>’.
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<br><dt><code>show arm force-mode</code><dd>Show the current forced instruction mode.
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<br><dt><code>set debug arm</code><dd>Toggle whether to display ARM-specific debugging messages from the ARM
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target support subsystem.
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<br><dt><code>show debug arm</code><dd>Show whether ARM-specific debugging messages are enabled.
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</dl>
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<dl>
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<dt><code>target sim </code><span class="roman">[</span><var>simargs</var><span class="roman">]</span><code> ...</code><dd>The <span class="sc">gdb</span> ARM simulator accepts the following optional arguments.
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<dl>
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<dt><code>--swi-support=</code><var>type</var><dd>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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<dl>
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<dt><code>none</code><br><dt><code>demon</code><br><dt><code>angel</code><br><dt><code>redboot</code><br><dt><code>all</code><dd></dl>
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</dl>
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</dl>
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