Switch 2: Compatibility Mode - Revision history

Suyasuya: Add at least some basic info of nnCompatTrampoline instead of leaving it empty...

2026-04-04T05:37:38Z

Add at least some basic info of nnCompatTrampoline instead of leaving it empty...

← Older revision		Revision as of 09:37, 4 April 2026
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	= nnCompatTrampoline =		= nnCompatTrampoline =
			This module contains, in particular, game-specific patches for at least 5 games. They follow a pattern of "nnCompatPatchFor****", where the last 5 digits are the game code (for example, "nnCompatPatchForAyl8a" for Metroid: Dread).

	= nnCompatThin =		= nnCompatThin =

2025-10-20T18:20:58Z

Modules

← Older revision		Revision as of 22:20, 20 October 2025
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	== Modules ==		== Modules ==
	Rtld is ~~replaced with an updated version~~.		Rtld is identical besides the extra page at the end of .bss for [[#CompatibilityParameter\|CompatibilityParameter]].

	The compat modules are loaded between the main module and the (sub)sdk* modules.		The compat modules are loaded between the main module and the (sub)sdk* modules.

	~~Besides rtld, the~~ existing modules are not directly modified.		The existing modules are not directly modified.

	== CompatibilityParameter ==		== CompatibilityParameter ==

2025-10-20T17:40:06Z

← Older revision		Revision as of 21:40, 20 October 2025
Line 20:		Line 20:

	Below is a breakdown what some of the hooks and what their purpose is.		Below is a breakdown what some of the hooks and what their purpose is.

			== Modules ==
			Rtld is replaced with an updated version.

			The compat modules are loaded between the main module and the (sub)sdk* modules.

			Besides rtld, the existing modules are not directly modified.

	== CompatibilityParameter ==		== CompatibilityParameter ==

2025-09-01T21:10:07Z

NPDM Adjustments

← Older revision		Revision as of 01:10, 2 September 2025
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	= NPDM Adjustments =		= NPDM Adjustments =
	* Game has access to SVC 0x80 even though it's not in the game NPDM.		* Game has access to SVC 0x54, 0x80 even though it's not in the game NPDM.
	* Game has CoreMask 0x3F (so access to core0-5) even though the game NPDM only has CoreMask 0x7.		* Game has CoreMask 0x3F (so access to core0-5) even though the game NPDM only has CoreMask 0x7.
	* It's unknown if the service whitelist is updated for the game when running in Compatibility mode.		* It's unknown if the service whitelist is updated for the game when running in Compatibility mode.

2025-09-01T19:47:24Z

nnCompat

← Older revision		Revision as of 23:47, 1 September 2025
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	\|-		\|-
	\| nn::vi::* \|\| Translation layer because vi:u was removed?		\| nn::vi::* \|\| Translation layer because vi:u was removed?
			\|-
			\| nn::pl::IsRunningOnOunce \|\| Returns 1 instead of 0.
	\|}		\|}

2025-08-20T16:52:54Z

← Older revision		Revision as of 20:52, 20 August 2025
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	\|-		\|-
	\|}		\|}

			= ApplicationCompatibilityInfo =
			The [[Switch 2: Title list\|ApplicationCompatibilityInfo]] SystemData contains "ApplicationCompatibilityInfo.json".

			The json "records" contains an array, each object entry then contains the following:
			* "application_id": "0x<lowercase hex ApplicationId>"
			* "target_max_version": <value> (normally u32-max)
			* "application_layer_info": This object contains various number fields, only fields needed by the current entry are present. "graphics_config", "misc_config", ...
			** The data from here is likely passed as input to [[#CompatibilityParameter\|CompatibilityParameter]].

	= nnCompatTrampoline =		= nnCompatTrampoline =

2025-08-06T23:15:23Z

← Older revision		Revision as of 03:15, 7 August 2025
(No difference)

2025-06-15T17:40:21Z

nnCompat

@@ Line 114: / Line 114: @@
 |-
 | nn::os::ConvertToTick || Uses conversion ratio 31250000 instead of 19200000.
 |}

2025-06-14T08:28:58Z

← Older revision		Revision as of 12:28, 14 June 2025
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	These binaries are compiled with PAC enabled.		These binaries are compiled with PAC enabled.

			= NPDM Adjustments =
			* Game has access to SVC 0x80 even though it's not in the game NPDM.
			* Game has CoreMask 0x3F (so access to core0-5) even though the game NPDM only has CoreMask 0x7.
			* It's unknown if the service whitelist is updated for the game when running in Compatibility mode.

	= Hooking =		= Hooking =

2025-06-06T07:33:59Z

← Older revision		Revision as of 11:33, 6 June 2025
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	\|-		\|-
	\| 4 \|\| SerializeSavedataAccess \|\| A global mutex is taken when a file starting with "savedata" is opened, and held until the file has been closed. Commit-action also takes the mutex, so the commit will not complete until the file has been closed.		\| 4 \|\| SerializeSavedataAccess \|\| A global mutex is taken when a file starting with "savedata" is opened, and held until the file has been closed. Commit-action also takes the mutex, so the commit will not complete until the file has been closed.
			\|-
			\| 6 \|\| PreventNegativeVibrationValue \|\|
	\|-		\|-
	\| 10 \|\| NeedsWaitingLaunchLogo \|\|		\| 10 \|\| NeedsWaitingLaunchLogo \|\|
Line 96:		Line 98:
	\|-		\|-
	\| nn::os::QueryMemoryInfo,nn::os::QueryMemoryInfoForDebug \|\| Hides stolen Heap memory that it uses for itself... \|\|		\| nn::os::QueryMemoryInfo,nn::os::QueryMemoryInfoForDebug \|\| Hides stolen Heap memory that it uses for itself... \|\|
			\|-
			\| nn::hid::VibrationPlayer::SetCurrentPosition \|\| If position is negative, drop the call. \|\| MiscControlData bit6
	\|}		\|}