mingw/info/gdb/VxWorks-Download.html

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  19 <h5 class="subsubsection">VxWorks download</h5>
  20
  21    <p>If you have connected to the VxWorks target and you want to debug an
  22 object that has not yet been loaded, you can use the GDB
  23 <code>load</code> command to download a file from Unix to VxWorks
  24 incrementally.  The object file given as an argument to the <code>load</code>
  25 command is actually opened twice: first by the VxWorks target in order
  26 to download the code, then by GDB in order to read the symbol
  27 table.  This can lead to problems if the current working directories on
  28 the two systems differ.  If both systems have NFS mounted the same
  29 filesystems, you can avoid these problems by using absolute paths.
  30 Otherwise, it is simplest to set the working directory on both systems
  31 to the directory in which the object file resides, and then to reference
  32 the file by its name, without any path.  For instance, a program
  33 <code>prog.o</code> may reside in <code></code><var>vxpath</var><code>/vw/demo/rdb</code> in VxWorks
  34 and in <code></code><var>hostpath</var><code>/vw/demo/rdb</code> on the host.  To load this
  35 program, type this on VxWorks:
  36
  37 <pre class="example">     -&gt; cd "<var>vxpath</var>/vw/demo/rdb"
  38      </pre>
  39
  40 <p>Then, in GDB, type:
  41
  42 <pre class="example">     (vxgdb) cd <var>hostpath</var>/vw/demo/rdb
  43      (vxgdb) load prog.o
  44      </pre>
  45
  46    GDB displays a response similar to this:
  47
  48 <pre class="smallexample">     Reading symbol data from wherever/vw/demo/rdb/prog.o... done.
  49      </pre>
  50
  51    <p>You can also use the <code>load</code> command to reload an object module
  52 after editing and recompiling the corresponding source file.  Note that
  53 this makes GDB delete all currently-defined breakpoints,
  54 auto-displays, and convenience variables, and to clear the value
  55 history.  (This is necessary in order to preserve the integrity of
  56 debugger's data structures that reference the target system's symbol
  57 table.)
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