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There are 2 types of syscalls:
1. Syscalls using undefined ARM instruction.
2. Syscalls using ARM syscall instruction.
Syscalls (via undefined instructions)
Syscalls are invoked by way of the invalid instruction handler; syscalls take the form 0xE7F000F0 | (syscall_num << 8). (E.g. E7F000F0 is syscall 0, E7F036F0 is syscall 0x36, etc.). IOS has 0x82 available syscalls.
(please feel free to contribute your own findings!)
|ID #||Internal name||Description||Return value|
|2D||int device_open(const char* device, int mode)||Similar to IOS_Open on PPC, except now internal to the IOS system||Returns an fd or error (negative)|