Tornado Reference : Tornado Utilities
xsymDec - extract the symbol table from an a.out object module for x86
xsymDec < objMod > symTbl
This tool reads an object module (UNIX BSD 4.3 a.out format) from standard input, and writes an object module to standard output. The output module contains only the symbol table, with no code, but is otherwise a normal, executable object module.
This tool is used to generate the VxWorks symbol table, vxWorks.sym for the x86.
a_out.h - UNIX BSD 4.3 object module header file
xsymDec, makeSymTbl, UNIX BSD 4.3 a.out documentation