JIT services: Difference between revisions
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This essentially does state/object init and maps the CodeMemory regions in the user-process. The permissions for the first CodeMemory is R-X, for the second CodeMemory it's R--. Both CodeMemory are mapped in the sysmodule with permissions RW-. | This essentially does state/object init and maps the CodeMemory regions in the user-process. The permissions for the first CodeMemory is R-X, for the second CodeMemory it's R--. Both CodeMemory are mapped in the sysmodule with permissions RW-. | ||
Both CodeMemory are | Both CodeMemory are optional. Handling for size=0 was originally broken, this was [[Switch_System_Flaws|fixed]] with [14.0.0+]. | ||
This copies the user-process CodeMemory addr/size for each CodeMemory to elsewhere in state, however it uses the first CodeMemory for the second CodeMemory state init as well. This is the same state used by [[#GenerateCode]] and [[#GetCodeAddress]]. | This copies the user-process CodeMemory addr/size for each CodeMemory to elsewhere in state, however it uses the first CodeMemory for the second CodeMemory state init as well. This is the same state used by [[#GenerateCode]] and [[#GetCodeAddress]]. | ||
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== GenerateCode == | == GenerateCode == | ||
Takes an u32, an u64, a [[#CodeRange]], a [[#CodeRange]], a [[#Struct32]], a type-0x5 input buffer, a type-0x6 output buffer, and returns an output s32, a [[#CodeRange]], a [[#CodeRange]]. | Takes an u32, an u64, a [[#CodeRange]], a [[#CodeRange]], a [[#Struct32]], a type-0x5 input buffer, a type-0x6 output buffer, and returns an output s32, a [[#CodeRange]], a [[#CodeRange]]. | ||
sdknso copies data from an user-buffer to the tmp [[#Struct32]] which is used with the cmd, the size of that user-buffer is passed as the cmd input u32. | |||
An error is thrown if the funcptr in state for the "nnjitpluginGenerateCode" symbol is not set. | An error is thrown if the funcptr in state for the "nnjitpluginGenerateCode" symbol is not set. | ||
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* in_CodeRange.size must be >= out_CodeRange.size. | * in_CodeRange.size must be >= out_CodeRange.size. | ||
* (out_CodeRange.offset-in_CodeRange.offset) must be <= (in_CodeRange.size-out_CodeRange.size). | * (out_CodeRange.offset-in_CodeRange.offset) must be <= (in_CodeRange.size-out_CodeRange.size). | ||
After using the cmd, sdknso runs cache operations. | |||
== Control == | == Control == | ||
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No input, returns two output u64s which are loaded from state. | No input, returns two output u64s which are loaded from state. | ||
These u64s are the user-process map-addrs for each CodeMemory from [[#CreateJitEnvironment|state]]. | These u64s are the user-process map-addrs for each CodeMemory from [[#CreateJitEnvironment|state]]. Originally the second addr was a duplicate of the first addr, this was [[Switch_System_Flaws|fixed]] with [14.0.0+]. | ||
== CodeRange == | == CodeRange == | ||
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== Struct32 == | == Struct32 == | ||
This is "nn::jitsrv::Struct32". This is a 0x20-byte struct. This is 8-byte aligned. | This is "nn::jitsrv::Struct32". This is a 0x20-byte struct. This is 8-byte aligned. | ||
This contains arbitrary plugin-specific input data which is passed to the [[#GenerateCode]] funcptr. | |||
= Title usage = | |||
There are no system-titles using jit:u. The only titles using it are the following: | |||
* [[Super Mario 3D All-Stars]] (N64 emulation only) | |||
* [[Nintendo 64 - Nintendo Switch Online]] | |||