Editing System calls
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PS4 kernel is based on FreeBSD 9.0; a list of FreeBSD 9.0 system calls can be found [http://fxr.watson.org/fxr/source/kern/syscalls.master?v=FREEBSD9 here]. | |||
Compatibility system calls, and some others, have been disabled. | |||
The first custom Sony system call comes immediately after the last FreeBSD system call, wait6, and is number 533. | |||
The final custom Sony system call is 617. | |||
Calling any system calls higher than 617 gives the same result as calling a compatibility or unimplemented system call, "There is not enough free system memory" error. | |||
Of these 85 (617 - 532), 9 always return 0x4e, ENOSYS, leaving us with just 76 which are usable (the disabled 9 may only be callable from development units). | |||
'''Functions of custom Sony system calls''' | |||
Known calls include those relating to: | |||
# Modules | |||
# Memory | |||
# Sandboxing | |||
# Semaphores | |||
Other potential calls could be for: | |||
# Mutexes | |||
Other operations, such as file IO and networking are handled through regular FreeBSD system calls. | |||