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Symbol values

Symbol table entries for different object file types have slightly different
interpretations for the st_value member.

   * In relocatable files, st_value holds alignment constraints for a symbol
     whose section index is SHN_COMMON.

   * In relocatable files, st_value holds a section offset for a defined
     symbol. st_value is an offset from the beginning of the section that
     st_shndx identifies.

   * In executable and shared object files, st_value holds a virtual
     address. To make these files' symbols more useful for the dynamic
     linker, the section offset (file interpretation) gives way to a virtual
     address (memory interpretation) for which the section number is
     irrelevant.

Although the symbol table values have similar meanings for different object
files, the data allows efficient access by the appropriate programs.