Difference between revisions of "PS2 Code Overlay"
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(Created page with "The PS2 version of San Andreas uses code overlays to save memory and swap code in only when it is actually needed. The files have the extension 'nm' for NTSC and 'pm' for PAL...") |
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4b - fourcc (MWo3) | 4b - fourcc (MWo3) | ||
4b - unknown (number of segments?) | 4b - unknown (number of segments?) | ||
| − | 4b - load address | + | 4b - load address/entry point? |
4b - size of text segment | 4b - size of text segment | ||
4b - size of data segment | 4b - size of data segment | ||
4b - size of bss segment | 4b - size of bss segment | ||
| − | 4b - end of data/start of bss segment | + | 4b - end of data/start of bss segment? |
| − | 4b - end of data/start of bss segment | + | 4b - end of data/start of bss segment? |
32b - file name | 32b - file name | ||
After that follow the text and data segment | After that follow the text and data segment | ||
Revision as of 10:10, 3 February 2016
The PS2 version of San Andreas uses code overlays to save memory and swap code in only when it is actually needed. The files have the extension 'nm' for NTSC and 'pm' for PAL respectively.
The following code overlays are used: clothes, credits, cutscene, fileload, init, jpeg, mc, mpeg
In the SLES version the files are loaded by the function at 0x3C6A80 which takes as its first argument the name of the file containing the code and as second argument the address where it is to be loaded (0x88D980 typically).
The files have a 64 byte long header:
4b - fourcc (MWo3) 4b - unknown (number of segments?) 4b - load address/entry point? 4b - size of text segment 4b - size of data segment 4b - size of bss segment 4b - end of data/start of bss segment? 4b - end of data/start of bss segment? 32b - file name
After that follow the text and data segment
