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| <h5 class="subsubsection">21.2.1.2 VxWorks Download</h5> |
| |
| <p><a name="index-download-to-VxWorks-1278"></a>If you have connected to the VxWorks target and you want to debug an |
| object that has not yet been loaded, you can use the <span class="sc">gdb</span> |
| <code>load</code> command to download a file from Unix to VxWorks |
| incrementally. The object file given as an argument to the <code>load</code> |
| command is actually opened twice: first by the VxWorks target in order |
| to download the code, then by <span class="sc">gdb</span> in order to read the symbol |
| table. This can lead to problems if the current working directories on |
| the two systems differ. If both systems have NFS mounted the same |
| filesystems, you can avoid these problems by using absolute paths. |
| Otherwise, it is simplest to set the working directory on both systems |
| to the directory in which the object file resides, and then to reference |
| the file by its name, without any path. For instance, a program |
| <samp><span class="file">prog.o</span></samp> may reside in <samp><var>vxpath</var><span class="file">/vw/demo/rdb</span></samp> in VxWorks |
| and in <samp><var>hostpath</var><span class="file">/vw/demo/rdb</span></samp> on the host. To load this |
| program, type this on VxWorks: |
| |
| <pre class="smallexample"> -> cd "<var>vxpath</var>/vw/demo/rdb" |
| </pre> |
| <p class="noindent">Then, in <span class="sc">gdb</span>, type: |
| |
| <pre class="smallexample"> (vxgdb) cd <var>hostpath</var>/vw/demo/rdb |
| (vxgdb) load prog.o |
| </pre> |
| <p><span class="sc">gdb</span> displays a response similar to this: |
| |
| <pre class="smallexample"> Reading symbol data from wherever/vw/demo/rdb/prog.o... done. |
| </pre> |
| <p>You can also use the <code>load</code> command to reload an object module |
| after editing and recompiling the corresponding source file. Note that |
| this makes <span class="sc">gdb</span> delete all currently-defined breakpoints, |
| auto-displays, and convenience variables, and to clear the value |
| history. (This is necessary in order to preserve the integrity of |
| debugger's data structures that reference the target system's symbol |
| table.) |
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