IOSU syscalls
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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 |
|---|---|---|---|
| C | int IOS_CreateMessageQueue(u32 *ptr, u32 n_msgs) | Create a queue at ptr, for n_msgs messages | The queue ID |
| 10 | int IOS_ReceiveMessage(int queueid, u32 *message, u32 flags) | Fetch a message from the front of a queue | 0 on success |
| 24 | void* IOS_Alloc(int heapid, u32 size) | Allocate size bytes from the specified heap | pointer to memory |
| 28 | BOOL IOS_RegisterResourceManager(const char* device, int queueid) | Registers device to the device tree, so it can be opened (from Starlet and PPC) | 0 on success |
| 2D | int IOS_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) |