Thread Local Storage

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This is the 0x200-byte TLS (thread local storage). It's base address is loaded via ARM threadid register tpidrro_el0. TLS for multiple threads are stored in the same page, with the first TLS normally located at page+0x200, because the first TLS spot is reserved for usermode exception handling.

Structure

Offset Size Description
0x0 0x100 IPC command buffer.
0x100 0xF8 Unknown.
0x1F8 0x8 Pointer to thread context.

Userland context

Boot paramter

This is "nn::os::detail::g_OsBootParamter".

Offset Size Description
0x00 0x04 Main thread handle.
0x04 0x04 Always 0.
0x08 0x30 Empty.

Resource manager storage

This is "nn::os::detail::g_OsResourceManagerStorage".

Offset Size Description
0x00 0x04 Always 0.
0x04 0x10 Process PRNG.
0x14 0x04 Padding.
0x18 0x08 Always set to 0.
0x20 0x08 AddressSpaceStart right shifted by 0x0C.
0x28 0x08 AddressSpaceEnd (AddressSpaceStart + AddressSpaceSize) right shifted by 0x0C and aligned to AddressSpaceAlign.
0x30 0x08 AddressSpaceAlign right shifted by 0x0C.
0x38 0x08 Always 0.
0x40 0x08 Always set to 0.
0x48 0x08 MapRegionBased right shifted by 0x0C.
0x50 0x08 MapRegionEnd (MapRegionBased + MapRegionSize) right shifted by 0x0C and aligned to MapRegionAlign.
0x58 0x08 MapRegionAlign right shifted by 0x0C.
0x60 0x08 Always 0.
0x68 0x08 Always 0.
0x70 0x1D0 Main thread context.
0x240 0x08 Pointer to main thread context.
0x248 0x08 Unknown.
0x250 0x08 Unknown.
0x258 0x130 Always empty?
0x388 0x08 Pointer to resource manager storage + 0x388.
0x390 0x08 Pointer to resource manager storage + 0x388.
0x398 0x08 Always 0.
0x3A0 0x08 Always 0.

Thread context

This structure is used for describing each thread's context. In the main thread's case, this structure comes from the resource manager storage.

Offset Size Description
0x00 0x08 Pointer to thread context + 0x1C8.
0x08 0x08 Pointer to thread context
0x10 0x08 Pointer to thread context + 0x10.
0x18 0x08 Pointer to thread context + 0x10.
0x20 0x20 Empty.
0x40 0x04 Thread status.
0x44 0x04 Thread priority minus 0x1C.
0x48 0x08 Thread stack base address.
0x50 0x08 Thread stack base address mirror.
0x58 0x08 Thread stack size.
0x60 0x08 Thread stub pointer.
0x68 0x08 Thread ID.
0x70 0x08 Always 0?
0x78 0x08 Always 0?
0x80 0x08 Always 0?
0x88 0x100 Initially empty (contains unknown pointers).
0x188 0x20 Thread name.
0x1A8 0x08 Thread name address.
0x1B0 0x04 Critical Section.
0x1B4 0x04 Conditional Variable.
0x1B8 0x04 Thread handle.
0x1BC 0x04 Always 0.
0x1C0 0x08 Thread global mutex.
0x1C8 0x08 Unknown.