Loader services

ldr:dmnt

This is "nn::ldr::detail::IDebugMonitorInterface".

Cmd	Name
0	AddProcessToDebugLaunchQueue
1	ClearDebugLaunchQueue
2	GetNsoInfos

AddProcessToDebugLaunchQueue

Same as AddProcessToLaunchQueue but for processes marked as debug.

ClearDebugLaunchQueue

Same as ClearLaunchQueue.

GetNsoInfos

Takes in a u64 ProcessID, and a C descriptor. Returns the number of NsoInfos copied to output.

NsoInfo has the following layout:

Offset	Size	Description
0x0	0x20	"Build ID", from NSO header+0x40.
0x20	0x8	Mapped address for this NSO
0x28	0x8	Mapped size for this NSO

ldr:pm

This is "nn::ldr::detail::IProcessManagerInterface".

Cmd	Name
0	CreateProcess
1	#GetProgramInfo
2	#RegisterTitle
3	#UnregisterTitle

GetProgramInfo

Takes a TitleId + StorageId, parses the NPDM, and writes output to a C descriptor buffer as follows:

Offset	Size	Description
0x0	0x1	MainThreadPrio. Arg1 to svcStartProcess
0x1	0x1	DefaultCpuId. Arg2 to svcStartProcess
0x2	0x1	ApplicationType, see here.
0x3	0x1	Padding
0x4	0x4	MainThreadStackSize. Arg3 to svcStartProcess
0x8	0x8	TitleIdRange_Min
0x10	0x4	ACID Service Access Control list size
0x14	0x4	ACI0 Service Access Control list size
0x18	0x4	ACID FS Access Control buffer size
0x1C	0x4	ACI0 FS Access Control buffer size
0x20	<Varies>	ACID Service Access Control list
<Varies>	<Varies>	ACI0 Service Access Control list
<Varies>	<Varies>	ACID FS Access Control buffer
<Varies>	<Varies>	ACI0 FS Access Control

RegisterTitle

Takes a TitleId + StorageId, returns an index.

UnregisterTitle

Takes the index from #RegisterTitle.

ldr:shel

This is "nn::ldr::detail::IShellInterface".

Cmd	Name
0	#AddProcessToLaunchQueue
1	#ClearLaunchQueue

AddProcessToLaunchQueue

Takes a type-0x19 input buffer with launch arguments (as string), an u32 (size of arguments string), and an input title-id.

Loads a process for the specified title-id and passes along the supplied arguments. Loaded processes are kept in a queue waiting for PM to launch them. The maximum number of waiting processes in this list is 10.

ClearLaunchQueue

Clears the loaded processes waiting queue.

ldr:ro, ro:1

[1.0.0-2.3.0] This is "nn::ldr::detail::IRoInterface"

[3.0.0+] This is "nn::ro::detail::IRoInterface".

[7.0.0+] ro:1 was added, and also creates nn::ro::detail::IRoInterface objects.

Cmd	Name
0	#LoadNro
1	UnloadNro
2	#LoadNrr
3	UnloadNrr
4	#Initialize
10	[7.0.0+] #LoadNrrEx

LoadNro

Word	Value
0	0x00000004
1	0x80000012
2	0x00000001
0-1	Pid
0	"SCFI"
1	0x00000000
2	Always 0.
3	Nro heap address
4	Nro size
5	Bss backing heap address
6	Bss size

LoadNrr

[7.0.0+] A new 8-bit field at NRR + 0x33C (previously padding) must be 0 for this function to succeed.

Word	Value
0	0x00000004
1	0x8000000E
2	0x00000001
0-1	Pid
0	"SFCI"
1	0x00000002
2	Always 0.
3	Nrr address
4	Nrr size

Initialize

Word	Value
0	0x00000004
1	0x8000000A
2	0x00000003
0-1	Pid
2	Process handle (0xFFFF8001)
0	"SFCI"
1	0x00000004
2	Always 0.

LoadNrrEx

Takes in a u64 nrr_address, a u64 nrr_size, a pid descriptor, and a process handle.

First, this validates that the pid descriptor matches the pid for the process handle sent to this->Initialize() earlier.

Then, this calls the same function as LoadNrr, except using the passed process handle instead of the one sent to Initialize.

When called from an ro:1 session, the field at NRR header + 0x33C must be 0x1. When called from ldr:ro session, the field at NRR header + 0x33C must be 0x0.