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 7.85 `.previous'
 ================
 
 This is one of the ELF section stack manipulation directives.  The
 others are `.section' ( Section), `.subsection' (
 SubSection), `.pushsection' ( PushSection), and `.popsection'
 ( PopSection).
 
    This directive swaps the current section (and subsection) with most
 recently referenced section/subsection pair prior to this one.  Multiple
 `.previous' directives in a row will flip between two sections (and
 their subsections).  For example:
 
      .section A
       .subsection 1
        .word 0x1234
       .subsection 2
        .word 0x5678
      .previous
       .word 0x9abc
 
    Will place 0x1234 and 0x9abc into subsection 1 and 0x5678 into
 subsection 2 of section A.  Whilst:
 
      .section A
      .subsection 1
        # Now in section A subsection 1
        .word 0x1234
      .section B
      .subsection 0
        # Now in section B subsection 0
        .word 0x5678
      .subsection 1
        # Now in section B subsection 1
        .word 0x9abc
      .previous
        # Now in section B subsection 0
        .word 0xdef0
 
    Will place 0x1234 into section A, 0x5678 and 0xdef0 into subsection
 0 of section B and 0x9abc into subsection 1 of section B.
 
    In terms of the section stack, this directive swaps the current
 section with the top section on the section stack.
 

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