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| en:docs:tk:formats:exe [2024/09/23 04:00] – prokushev | en:docs:tk:formats:exe [2024/10/17 02:50] (current) – prokushev | ||
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| ====== DOS Executable file format ====== | ====== DOS Executable file format ====== | ||
| - | All multi-byte values are stored LSB first. One block is 512 bytes, one paragraph is 16 bytes. | + | * All multi-byte values are stored LSB first. One block is 512 bytes, one paragraph is 16 bytes. |
| + | * If the word at offset 02h is 4, it should be treated as 00h, since pre-1.10 versions of the MS linker set it that way. | ||
| + | * If both minimum and maximum allocation (offset 0Ah/0Ch) are zero, the program is loaded as high in memory as possible (DOS only checks the maximum allocation, however). | ||
| + | * The maximum allocation is set to FFFFh by default. | ||
| + | * Additional data may be contained in the file beyond the end of the load image described by the .EXE header; this data may be overlays, the actual executable for newer-format executables, | ||
| + | * Relocations entries need not be in any particular order, although they are typically stored in order from beginning to end of the load image. | ||
| ^ Offset ^ Size ^ Name ^ Description ^ | ^ Offset ^ Size ^ Name ^ Description ^ | ||
| Line 18: | Line 23: | ||
| | 18h | WORD | e_lfarlc | Offset of the first relocation item in the file. | | | 18h | WORD | e_lfarlc | Offset of the first relocation item in the file. | | ||
| | 1Ah | WORD | e_ovno | Overlay number. Normally zero, meaning that it's the main program. | | | 1Ah | WORD | e_ovno | Overlay number. Normally zero, meaning that it's the main program. | | ||
| - | | 1Ch | DWORD | e_res | | | + | | 1Ch | DWORD | e_res | Reserved |
| | 20h | WORD | e_oemid | | | | 20h | WORD | e_oemid | | | ||
| | 22h | WORD | e_oeminfo | | | | 22h | WORD | e_oeminfo | | | ||
| - | | 24h | 24 WORD | e_res2 | | | + | | 24h | 24 WORD | e_res2 | Reserved |
| - | | 2ch | DWORD | e_lfanew | | + | | 3ch | DWORD | e_lfanew |