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Specifying PSEXE format, and PSX.EXE detail.

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Nicolas Noble 2021-04-09 11:37:05 -07:00 committed by GitHub
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docs/cdromdrive.md
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@ -3400,10 +3400,10 @@ PSX executables are having an 800h-byte header, followed by the code/data.<br/>
014h Initial GP/R28 (usually 0)
018h Destination Address in RAM (usually 80010000h, or higher)
01Ch Filesize (must be N*800h) (excluding 800h-byte header)
020h Unknown/Unused (usually 0)
024h Unknown/Unused (usually 0)
028h Memfill Start Address (usually 0) (when below Size=None)
02Ch Memfill Size in bytes (usually 0) (0=None)
020h Data section Start Address (usually 0)
024h Data Section Size in bytes (usually 0)
028h BSS section Start Address (usually 0) (when below Size=None)
02Ch BSS section Size in bytes (usually 0) (0=None)
030h Initial SP/R29 & FP/R30 Base (usually 801FFFF0h) (or 0=None)
034h Initial SP/R29 & FP/R30 Offs (usually 0, added to above Base)
038h-04Bh Reserved for A(43h) Function (should be zerofilled in exefile)
@ -3443,10 +3443,8 @@ you can put an original PSX CDROM into a DOS/Windows computer, and view the
content of the files in text or hex editors without problems).<br/>
#### PSX.EXE
Aside from SYSTEM.CNF, the Kernel seems to be also checking for a file named
PSX.EXE, purpose is unknown, maybe this is the default executable name when
SYSTEM.CNF is not found?<br/>
Some games do not have a SYSTEM.CNF file, in which case the kernel will
fallback on loading a file named PSX.EXE.
## CDROM Protection - SCEx Strings