Difference between revisions of "JIT services"
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| − | JIT is a sysmodule for run-time code generation | + | JIT is a sysmodule for run-time code generation (allowing for overlapping R-X and RW- views of memory). This was added to retail with [10.0.0+]. This was also supported in sdknso for a number of versions prior. |
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| + | nnMain just initializes [[RO_services|ro:1]], then starts hosting the service from the main-thread with max_sessions=1 (threads are not created for service-hosting). | ||
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| + | This is intended to only be used by Applications. The initialization in sdknso uses [[Applet_Manager_services#PrepareForJit|PrepareForJit]] at the start. sdknso later uses [[SVC|svcCreateCodeMemory]]. | ||
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| + | This loads the user-specified [[NRO]] into sysmodule-context ("DllPlugin"), and calls various symbols from that NRO. It seems the code writing (in cmd GenerateCode) is done via symbol-calling, allowing the NRO to handle input_buffer->code translation+writing. | ||
= jit:u = | = jit:u = | ||
Revision as of 14:48, 15 April 2020
JIT is a sysmodule for run-time code generation (allowing for overlapping R-X and RW- views of memory). This was added to retail with [10.0.0+]. This was also supported in sdknso for a number of versions prior.
nnMain just initializes ro:1, then starts hosting the service from the main-thread with max_sessions=1 (threads are not created for service-hosting).
This is intended to only be used by Applications. The initialization in sdknso uses PrepareForJit at the start. sdknso later uses svcCreateCodeMemory.
This loads the user-specified NRO into sysmodule-context ("DllPlugin"), and calls various symbols from that NRO. It seems the code writing (in cmd GenerateCode) is done via symbol-calling, allowing the NRO to handle input_buffer->code translation+writing.
jit:u
This is "nn::jitsrv::IJitService".
| Cmd | Name | Notes |
|---|---|---|
| 0 | CreateJitEnvironment | Returns an #IJitEnvironment |
IJitEnvironment
This is "nn::jitsrv::IJitEnvironment".
| Cmd | Name |
|---|---|
| 0 | GenerateCode |
| 1 | Control |
| 1000 | LoadPlugin |
| 1001 | GetCodeAddress |