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| <h3 class="section">7.71 <code>.previous</code></h3> |
| |
| <p><a name="index-g_t_0040code_007bprevious_007d-directive-437"></a><a name="index-Section-Stack-438"></a>This is one of the ELF section stack manipulation directives. The others are |
| <code>.section</code> (see <a href="Section.html#Section">Section</a>), <code>.subsection</code> (see <a href="SubSection.html#SubSection">SubSection</a>), |
| <code>.pushsection</code> (see <a href="PushSection.html#PushSection">PushSection</a>), and <code>.popsection</code> |
| (see <a href="PopSection.html#PopSection">PopSection</a>). |
| |
| <p>This directive swaps the current section (and subsection) with most recently |
| referenced section/subsection pair prior to this one. Multiple |
| <code>.previous</code> directives in a row will flip between two sections (and their |
| subsections). For example: |
| |
| <pre class="smallexample"> .section A |
| .subsection 1 |
| .word 0x1234 |
| .subsection 2 |
| .word 0x5678 |
| .previous |
| .word 0x9abc |
| </pre> |
| <p>Will place 0x1234 and 0x9abc into subsection 1 and 0x5678 into subsection 2 of |
| section A. Whilst: |
| |
| <pre class="smallexample"> .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 |
| </pre> |
| <p>Will place 0x1234 into section A, 0x5678 and 0xdef0 into subsection 0 of |
| section B and 0x9abc into subsection 1 of section B. |
| |
| <p>In terms of the section stack, this directive swaps the current section with |
| the top section on the section stack. |
| |
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