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KProcess

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class KProcess extends KSynchronizationObject;

SizeĀ : 0x260 bytes

Offset Type Description
0x0 u32 Pointer to vtable
0x4 u32 Reference count
0x8 u32 Count of KThreads that sync with this object - number of nodes in the linked list below
0xC KLinkedListNode* Pointer to first KLinkedListNode in node list of KThreads that sync with this object
0x10 KLinkedListNode* Pointer to last KLinkedListNode in node list of KThreads that sync with this object
0x1C volatile KThread* 0 or pointer to the thread the currently does something with the process object.
0x20 s16 ?
0x30 KLinkedListNode* Pointer to first KLinkedListNode in list of KMemoryBlocks used by the process
0x34 KLinkedListNode* Pointer to last KLinkedListNode in list of KMemoryBlocks used by the process
0x40 u32 Translation table base
0x44 u8 Context ID
0x50 u32 Size of the MMU table
0x54 u32 Virtual address of the MMU table for this process
0x58 u32 Total size of all thread context pages (0xFF4xxxxx) owned by threads that belong to this process
0x5C u32 Number of KThreadLocalPages used by this KProcess
0x60 KLinkedListNode* Pointer to first KLinkedListNode in the list of KThreadLocalPages
0x64 KLinkedListNode* Pointer to last KLinkedListNode in the list of KThreadLocalPages
0x6C s32 Ideal processor
0x74 u32 Pointer to resource limits for process.
0x79 u8 Proc affinity mask
0x7C u32 Number of threads which belong to this process.
0x80 0x10-bytes SVC access control mask from the exheader kernel descriptors. This is copied to the 0xFF4XX000 area when creating threads, which is the actual data the SVC-handler checks for SVC-access-control.
0x90 0x10-bytes Interrupt flags- 32 interrupts per word, 4 words, 0x80 interrupts total divided evenly across 4 words
0xA0 u32 Kernel flags from the exheader kernel descriptors.
0xA4 u16 Handle table size from the exheader kernel descriptors. When this is 0, handle table is stored in WRAM.
0xA6 u16 Kernel release version field, from the exheader kernel descriptors.
0xA8 u32 Pointer to KCodeSet instance
0xAC u32 Process id, this always begins at 0x0 for the first process.
0xB0 u32 Kernel flags from the exheader kernel descriptors.
0xB8 KThread* Pointer to the process's main (?) thread.
0xCC KProcessHandleTable Pointer to the process's handle table. until 0x1C4 or longer
0x224 u32 ?


Structure starting with 8.0.0-18 NATIVE_FIRM:

SizeĀ : 0x268 bytes

Offset Type Description
0x0 u32 Pointer to vtable
0x4 u32 Reference count
0x8 u32 Count of KThreads that sync with this object - number of nodes in the linked list below
0xC KLinkedListNode* Pointer to first KLinkedListNode in node list of KThreads that sync with this object
0x10 KLinkedListNode* Pointer to last KLinkedListNode in node list of KThreads that sync with this object
0x2C u32 Count of KMemoryBlocks owned by the process
0x30 KLinkedListNode* Pointer to first KLinkedListNode in list of KMemoryBlocks used by the process
0x34 KLinkedListNode* Pointer to last KLinkedListNode in list of KMemoryBlocks used by the process
0x40 u32 Translation table base
0x44 u8 Context ID
0x4C u32 End of userland virtual memory for the process
0x50 u32* LINEAR memory virtual address(userland) base for this process.
0x58 u32 Size of the MMU table
0x5C u32 Virtual address of the MMU table for this process
0x60 u32 Total size of all thread context pages (0xFF4xxxxx) owned by threads that belong to this process
0x64 u32 Number of KThreadLocalPages used by this KProcess
0x68 KLinkedListNode* Pointer to first KLinkedListNode in the list of KThreadLocalPages
0x6C KLinkedListNode* Pointer to last KLinkedListNode in the list of KThreadLocalPages
0x74 s32 Ideal processor for this process
0x7C KResourceLimit* Pointer to resource limits for process.
0x84 u32 Number of threads which belong to this process.
0x88 0x10-bytes SVC access control mask from the exheader kernel descriptors. This is copied to the 0xFF4XX000 area when creating threads, which is the actual data the SVC-handler checks for SVC-access-control.
0x98 u32[4] Interrupt available flags- 32 interrupts per word, 4 words, 0x80 interrupts total divided evenly across 4 words
0xA8 u32 Kernel flags from the exheader kernel descriptors.
0xAC u16 Handle table size from the exheader kernel descriptors. When this is 0, handle table is stored in WRAM.
0xAE u16 Kernel release version field, from the exheader kernel descriptors.
0xB0 u32 Pointer to KCodeSet instance
0xB4 u32 Process id, this always begins at 0x0 for the first process.
0xC0 KThread* Pointer to the process's main thread.
0xC4 u32[4] Interrupt enabled flags- 32 interrupts per word, 4 words, 0x80 interrupts total divided evenly across 4 words
0xD4 KProcessHandleTable This is the data for tracking and using all of the KProcess's handles.
0xEC HandleData[0x28] These internal HandleData entries are only used if the exheader's handle table size is 0
0x22C u32 Unknown


Structure starting with 8.1.0-0 New3DS NATIVE_FIRM:

SizeĀ : 0x270 bytes

Offset Type Description
0x0 u32 Pointer to vtable
0x4 u32 Reference count
0x8 u32 Count of KThreads that sync with this object - number of nodes in the linked list below
0xC KLinkedListNode* Pointer to first KLinkedListNode in node list of KThreads that sync with this object
0x10 KLinkedListNode* Pointer to last KLinkedListNode in node list of KThreads that sync with this object
0x2C u32 Unknown new
0x30 u32 Unknown new
0x34 u32 Count of KMemoryBlocks owned by the process
0x38 KLinkedListNode* Pointer to first KLinkedListNode in list of KMemoryBlocks used by the process
0x3C KLinkedListNode* Pointer to last KLinkedListNode in list of KMemoryBlocks used by the process
0x48 u32 Translation table base
0x4C u8 Context ID
0x54 u32 End of userland virtual memory for the process
0x58 u32* LINEAR memory virtual address(userland) base for this process.
0x60 u32 Size of the MMU table
0x64 u32 Virtual address of the MMU table for this process
0x68 u32 Total size of all thread context pages (0xFF4xxxxx) owned by threads that belong to this process
0x6C u32 Number of KThreadLocalPages used by this KProcess
0x70 KLinkedListNode* Pointer to first KLinkedListNode in the list of KThreadLocalPages
0x74 KLinkedListNode* Pointer to last KLinkedListNode in the list of KThreadLocalPages
0x7C s32 Ideal processor for this process
0x80 KDebug* KDebug object created from svc 60 to debug the process
0x84 KResourceLimit* Pointer to resource limits for process.
0x88 u8 Normally 1 to indicate process is open/available. Set to 2 to indicate process is exiting/closing and 3 to indicate exited/closed.
0x89 u8 Process affinity mask
0x8A u16 Unused, alignment
0x8C u32 Number of threads which belong to this process.
0x90 0x10-bytes SVC access control mask from the exheader kernel descriptors. This is copied to the 0xFF4XX000 area when creating threads, which is the actual data the SVC-handler checks for SVC-access-control.
0xA0 u32[4] Interrupt flags- 32 interrupts per word, 4 words, 0x80 interrupts total divided evenly across 4 words
0xB0 u32 Kernel flags from the exheader kernel descriptors.
0xB4 u16 Handle table size from the exheader kernel descriptors. When this is 0, handle table is stored in WRAM.
0xB6 u16 Kernel release version field, from the exheader kernel descriptors.
0xB8 KCodeSet* Pointer to KCodeSet instance
0xBC u32 Process id, this always begins at 0x0 for the first process.
0xC0 s64 Tick count on process creation
0xC8 KThread* Pointer to the process's main thread.
0xCC u32[4] Interrupt enabled flags- 32 interrupts per word, 4 words, 0x80 interrupts total divided evenly across 4 words
0xDC KProcessHandleTable This is the data for tracking and using all of the KProcess's handles.
0xF4 HandleData[0x28] These internal HandleData entries are only used if the exheader's handle table size is 0
0x234 u32 Unused (From here up, everything is set to 0 on creation, has 0 written to it again during process creation, and is never used again.)
0x238 u64 Unused
0x240 u64 Unused
0x248 u64 Unused
0x250 u64 Unused
0x258 u64 Unused
0x260 u64 Unused
0x268 u64 Unused


KProcessHandleTable info struct:

Offset Type Description
0x0 HandleData* Pointer to the process's handle table.
0x4 u16 The max number of handles that can be open at once - usually 0x200.
0x6 u16 Unknown
0x8 HandleData* Pointer to the next open HandleData entry in the handle table.
0xC u16 Total handles used by this KProcess.
0xE u16 The current number of handles in use.
0x10 u32 Unknown
0x14 u32 Unknown
0x16 u32 Unknown
0x18 HandleData[0x28] This small handle data table, internal to the KProcess, is only used in certain processes that don't have an external handle data table in FCRAM. It is all zeros in most processes.


HandleData struct:

Offset Type Description
0x0 u32 Handle info
0x4 u32 Pointer to the kernel object that the handle references.

The handle info u32 works as such:

The high byte is a remainder from the pointer to the next entry that originally occupied the handle table entry. It is unused. Byte 2 is either the class type token starting with firmware version 9.0 or the lowest byte of the char* that points to the class type name in firmware versions below 9.0. The lower halfword is the handle number of the current handle taken from the total handle count for the KProcess that owns the table.

On table creation, each entry in the handle data table is populated with a pointer to the next entry in the table. When a new handle is created, that pointer is moved into offset 0x8 of the KProcessHandleTable info struct to use for generation of the next handle.

The final handle that gets returned when a handle is created is (handle_index | (handle_total << 15)), basically they take the index into the handle data table and OR that with the total handle count << 15. This returned value is the one that gets passed back to the running application and is used to look up the HandleData entry in the table.

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