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Every object file has a table of section headers to specify the layout of data within the file. The section header table consists of one entry for every section in the file. The information in the section header is described in ``Section header contents''.
Section header contents
| Bytes | Declaration | Name | Description |
|---|---|---|---|
| 0-7 | char | s_name | 8-character null padded section name |
| 8-11 | long int | s_paddr | Physical address of section |
| 12-15 | long int | s_vaddr | Virtual address of section |
| 16-19 | long int | s_size | Section size in bytes |
| 20-23 | long int | s_scnptr | File pointer to raw data |
| 24-27 | long int | s_relptr | File pointer to relocation entries |
| 28-31 | long int | s_lnnoptr | File pointer to line number entries |
| 32-33 | unsigned short | s_nreloc | Number of relocation entries |
| 34-35 | unsigned short | s_nlnno | Number of line number entries |
| 36-39 | long int | s_flags | Flags (see ``Section header flags'') |
The size of a section is padded to a multiple of 4 bytes.
File pointers are byte offsets that can be used to
locate the start of data, relocation,
or line number entries for the section.
They can be readily used with the function
fseek(S).