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| <a name="MIPS-1"></a> |
| <h4 class="subsection">21.4.4 <acronym>MIPS</acronym></h4> |
| |
| <a name="index-stack-on-Alpha"></a> |
| <a name="index-stack-on-MIPS"></a> |
| <a name="index-Alpha-stack"></a> |
| <a name="index-MIPS-stack"></a> |
| <p>Alpha- and <acronym>MIPS</acronym>-based computers use an unusual stack frame, which |
| sometimes requires <small>GDB</small> to search backward in the object code to |
| find the beginning of a function. |
| </p> |
| <a name="index-response-time_002c-MIPS-debugging"></a> |
| <p>To improve response time (especially for embedded applications, where |
| <small>GDB</small> may be restricted to a slow serial line for this search) |
| you may want to limit the size of this search, using one of these |
| commands: |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-heuristic_002dfence_002dpost-_0028Alpha_002c-MIPS_0029"></a> |
| </dd> |
| <dt><code>set heuristic-fence-post <var>limit</var></code></dt> |
| <dd><p>Restrict <small>GDB</small> to examining at most <var>limit</var> bytes in its |
| search for the beginning of a function. A value of <var>0</var> (the |
| default) means there is no limit. However, except for <var>0</var>, the |
| larger the limit the more bytes <code>heuristic-fence-post</code> must search |
| and therefore the longer it takes to run. You should only need to use |
| this command when debugging a stripped executable. |
| </p> |
| </dd> |
| <dt><code>show heuristic-fence-post</code></dt> |
| <dd><p>Display the current limit. |
| </p></dd> |
| </dl> |
| |
| <p>These commands are available <em>only</em> when <small>GDB</small> is configured |
| for debugging programs on Alpha or <acronym>MIPS</acronym> processors. |
| </p> |
| <p>Several <acronym>MIPS</acronym>-specific commands are available when debugging <acronym>MIPS</acronym> |
| programs: |
| </p> |
| <dl compact="compact"> |
| <dt><code>set mips abi <var>arg</var></code></dt> |
| <dd><a name="index-set-mips-abi"></a> |
| <a name="index-set-ABI-for-MIPS"></a> |
| <p>Tell <small>GDB</small> which <acronym>MIPS</acronym> ABI is used by the inferior. Possible |
| values of <var>arg</var> are: |
| </p> |
| <dl compact="compact"> |
| <dt>‘<samp>auto</samp>’</dt> |
| <dd><p>The default ABI associated with the current binary (this is the |
| default). |
| </p></dd> |
| <dt>‘<samp>o32</samp>’</dt> |
| <dt>‘<samp>o64</samp>’</dt> |
| <dt>‘<samp>n32</samp>’</dt> |
| <dt>‘<samp>n64</samp>’</dt> |
| <dt>‘<samp>eabi32</samp>’</dt> |
| <dt>‘<samp>eabi64</samp>’</dt> |
| </dl> |
| |
| </dd> |
| <dt><code>show mips abi</code></dt> |
| <dd><a name="index-show-mips-abi"></a> |
| <p>Show the <acronym>MIPS</acronym> ABI used by <small>GDB</small> to debug the inferior. |
| </p> |
| </dd> |
| <dt><code>set mips compression <var>arg</var></code></dt> |
| <dd><a name="index-set-mips-compression"></a> |
| <a name="index-code-compression_002c-MIPS"></a> |
| <p>Tell <small>GDB</small> which <acronym>MIPS</acronym> compressed |
| <acronym title="Instruction Set Architecture">ISA</acronym> (Instruction Set Architecture) encoding is used by the |
| inferior. <small>GDB</small> uses this for code disassembly and other |
| internal interpretation purposes. This setting is only referred to |
| when no executable has been associated with the debugging session or |
| the executable does not provide information about the encoding it uses. |
| Otherwise this setting is automatically updated from information |
| provided by the executable. |
| </p> |
| <p>Possible values of <var>arg</var> are ‘<samp>mips16</samp>’ and ‘<samp>micromips</samp>’. |
| The default compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding is ‘<samp>mips16</samp>’, as |
| executables containing <acronym>MIPS16</acronym> code frequently are not |
| identified as such. |
| </p> |
| <p>This setting is “sticky”; that is, it retains its value across |
| debugging sessions until reset either explicitly with this command or |
| implicitly from an executable. |
| </p> |
| <p>The compiler and/or assembler typically add symbol table annotations to |
| identify functions compiled for the <acronym>MIPS16</acronym> or |
| <acronym>microMIPS</acronym> <acronym title="Instruction Set Architecture">ISA</acronym>s. If these function-scope annotations |
| are present, <small>GDB</small> uses them in preference to the global |
| compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding setting. |
| </p> |
| </dd> |
| <dt><code>show mips compression</code></dt> |
| <dd><a name="index-show-mips-compression"></a> |
| <p>Show the <acronym>MIPS</acronym> compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding used by |
| <small>GDB</small> to debug the inferior. |
| </p> |
| </dd> |
| <dt><code>set mipsfpu</code></dt> |
| <dt><code>show mipsfpu</code></dt> |
| <dd><p>See <a href="MIPS-Embedded.html#MIPS-Embedded">set mipsfpu</a>. |
| </p> |
| </dd> |
| <dt><code>set mips mask-address <var>arg</var></code></dt> |
| <dd><a name="index-set-mips-mask_002daddress"></a> |
| <a name="index-MIPS-addresses_002c-masking"></a> |
| <p>This command determines whether the most-significant 32 bits of 64-bit |
| <acronym>MIPS</acronym> addresses are masked off. The argument <var>arg</var> can be |
| ‘<samp>on</samp>’, ‘<samp>off</samp>’, or ‘<samp>auto</samp>’. The latter is the default |
| setting, which lets <small>GDB</small> determine the correct value. |
| </p> |
| </dd> |
| <dt><code>show mips mask-address</code></dt> |
| <dd><a name="index-show-mips-mask_002daddress"></a> |
| <p>Show whether the upper 32 bits of <acronym>MIPS</acronym> addresses are masked off or |
| not. |
| </p> |
| </dd> |
| <dt><code>set remote-mips64-transfers-32bit-regs</code></dt> |
| <dd><a name="index-set-remote_002dmips64_002dtransfers_002d32bit_002dregs"></a> |
| <p>This command controls compatibility with 64-bit <acronym>MIPS</acronym> targets that |
| transfer data in 32-bit quantities. If you have an old <acronym>MIPS</acronym> 64 target |
| that transfers 32 bits for some registers, like <small>SR</small> and <small>FSR</small>, |
| and 64 bits for other registers, set this option to ‘<samp>on</samp>’. |
| </p> |
| </dd> |
| <dt><code>show remote-mips64-transfers-32bit-regs</code></dt> |
| <dd><a name="index-show-remote_002dmips64_002dtransfers_002d32bit_002dregs"></a> |
| <p>Show the current setting of compatibility with older <acronym>MIPS</acronym> 64 targets. |
| </p> |
| </dd> |
| <dt><code>set debug mips</code></dt> |
| <dd><a name="index-set-debug-mips"></a> |
| <p>This command turns on and off debugging messages for the <acronym>MIPS</acronym>-specific |
| target code in <small>GDB</small>. |
| </p> |
| </dd> |
| <dt><code>show debug mips</code></dt> |
| <dd><a name="index-show-debug-mips"></a> |
| <p>Show the current setting of <acronym>MIPS</acronym> debugging messages. |
| </p></dd> |
| </dl> |
| |
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