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| <h4 class="subsection">2.6.1 Section input</h4> |
| <p>When a BFD is opened for reading, the section structures are |
| created and attached to the BFD. |
| </p> |
| <p>Each section has a name which describes the section in the |
| outside world—for example, <code>a.out</code> would contain at least |
| three sections, called <code>.text</code>, <code>.data</code> and <code>.bss</code>. |
| </p> |
| <p>Names need not be unique; for example a COFF file may have several |
| sections named <code>.data</code>. |
| </p> |
| <p>Sometimes a BFD will contain more than the “natural” number of |
| sections. A back end may attach other sections containing |
| constructor data, or an application may add a section (using |
| <code>bfd_make_section</code>) to the sections attached to an already open |
| BFD. For example, the linker creates an extra section |
| <code>COMMON</code> for each input file’s BFD to hold information about |
| common storage. |
| </p> |
| <p>The raw data is not necessarily read in when |
| the section descriptor is created. Some targets may leave the |
| data in place until a <code>bfd_get_section_contents</code> call is |
| made. Other back ends may read in all the data at once. For |
| example, an S-record file has to be read once to determine the |
| size of the data. An IEEE-695 file doesn’t contain raw data in |
| sections, but data and relocation expressions intermixed, so |
| the data area has to be parsed to get out the data and |
| relocations. |
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