Difference between revisions of "NPDM"
(→META) |
(→ACID) |
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| [[#FS Access Control]] offset | | [[#FS Access Control]] offset | ||
|- | |- | ||
| − | | | + | | 0x224 |
| 0x4 | | 0x4 | ||
| [[#FS Access Control]] size | | [[#FS Access Control]] size | ||
|- | |- | ||
| − | | | + | | 0x228 |
| 0x4 | | 0x4 | ||
| [[#Service Access Control]] offset | | [[#Service Access Control]] offset | ||
|- | |- | ||
| − | | | + | | 0x22C |
| 0x4 | | 0x4 | ||
| [[#Service Access Control]] size | | [[#Service Access Control]] size | ||
|- | |- | ||
| − | | | + | | 0x230 |
| 4 | | 4 | ||
| [[#Kernel Access Control]] offset | | [[#Kernel Access Control]] offset | ||
|- | |- | ||
| − | | | + | | 0x234 |
| 4 | | 4 | ||
| [[#Kernel Access Control]] size | | [[#Kernel Access Control]] size | ||
|- | |- | ||
| − | | | + | | 0x238 |
| 0x8 | | 0x8 | ||
| Padding | | Padding | ||
Revision as of 23:14, 28 June 2017
This is the Switch equivalent of 3DS exheader. This is the file with extension ".npdm" in {Switch ExeFS}. The size of this file varies.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x80 | META |
| 0x80 | <Varies> | ACID |
| <See META> | <See META> | ACI0 |
META
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Magic "META". |
| 0x20 | ? | Title name |
| 0x70 | 0x4 | #ACI0 offset |
| 0x74 | 0x4 | #ACI0 size |
| 0x78 | 0x4 | #ACID offset |
| 0x7C | 0x4 | #ACID size |
ACID
| Offset | Size | Description |
|---|---|---|
| 0 | 0x100 | RSA-2048 signature |
| 0x100 | 0x100 | RSA-2048 public key |
| 0x200 | 0x4 | Magic "ACID". |
| 0x204 | 0x8 | Zeroes |
| 0x20C | 0x4 | Format version? (1) |
| 0x210 | 0x8 | Title id |
| 0x218 | 0x8 | Title id again |
| 0x220 | 0x4 | #FS Access Control offset |
| 0x224 | 0x4 | #FS Access Control size |
| 0x228 | 0x4 | #Service Access Control offset |
| 0x22C | 0x4 | #Service Access Control size |
| 0x230 | 4 | #Kernel Access Control offset |
| 0x234 | 4 | #Kernel Access Control size |
| 0x238 | 0x8 | Padding |
ACI0
Looks like an old crappy version of ACID. It has the guessed version field 0 instead of 1.
FS Access Control
| Bit | Description |
|---|---|
| 0 | MountContent* is accessible when set. |
| 3 | This is only bit set for ShopN in the permissions-u32. |
Service Access Control
This is a list of service-name strings which the title has access to, with the following structure:
+0: control_byte
+1: {service-name without nul-terminator}
Bitmask 0x0F in control_byte is the {length of the service-name without nul-terminator} - 1.
Bitmask 0x80 in control_byte means service is allowed to be registered.
The service string can contain a wildcard * character.
Kernel Access Control
Like the 3DS, the switch has a number of kernel capability descriptors. Unlike 3ds, where descriptors were identified by pattern 11..10 in high bits, on switch descriptors are identified by pattern 01..11 in low bits.
| Pattern of bits 20-31 | Type | Fields |
|---|---|---|
0bxxxxxxxx0111?
|
Interrupt info? | ? |
0bxxxxxxx01111
|
System call mask | Bits 29-31: System call mask table index; Bits 5-28: mask |
0bxxxxx0111111?
|
Kernel release version? | ? |
0bxxxx01111111?
|
Handle table size? | ? |
0bxxx011111111?
|
Kernel flags? | ? |
0bx0111111111?
|
Map address range? | ? |
0b011111111111?
|
Map memory page? | ? |