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Kernel ABI: Difference between revisions

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Add ControlMemory
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Inputs are read from registers starting from r0 and outputs are written back to the same registers (also starting with r0).
= Calling Convention =
Seems to be [https://github.com/ARM-software/abi-aa/blob/main/aapcs32/aapcs32.rst#the-base-procedure-call-standard AAPCS]-based (with modifications)


== Overview ==
=== Inputs ===
* <code>r0–r3</code> : Argument / Scratch registers (caller-saved), inherited from AAPCS. ''If an input is to be placed on the stack, it will instead use the next free register starting from <code>r0</code>.''
=== Outputs ===
* <code>r0-r1</code> : Result, inherited from AAPCS. ''If multiple outputs are returned (e.g., <code>ControlMemory</code>), they are placed in consecutive registers starting from <code>r0</code>.''
== Example ==
<code>Result ControlMemory(uintptr_t* out, uintptr_t addr0, uintptr_t addr1, size_t size, MemoryOperation operation, MemoryPermission permissions)</code>
=== Inputs ===
Following standard [https://github.com/ARM-software/abi-aa/blob/main/aapcs32/aapcs32.rst#the-base-procedure-call-standard AAPCS] register selection:
; <code>r1</code> -> addr0
; <code>r2</code> -> addr1
; <code>r3</code> -> size
As there are still more arguments, the next free registers are selected starting from <code>r0</code>
; <code>r0</code> -> operation
; <code>r4</code> -> permissions
=== Outputs ===
; <code>r0</code> -> Result
; <code>r1</code> -> uintptr_t out
== System calls ==
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
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|
|
<code>r0</code>: <code>[[Memory Management#enum_MemoryOperation|MemoryOperation]] operation</code><br>
<code>r0</code>: <code>[[Memory Management#enum_MemoryOperation|MemoryOperation]] operation</code><br>
<code>r1</code>: <code>u32 addr0</code><br>
<code>r1</code>: <code>u32/void* addr0</code><br>
<code>r2</code>: <code>u32 addr1</code><br>
<code>r2</code>: <code>u32/void* addr1</code><br>
<code>r3</code>: <code>u32 size</code><br>
<code>r3</code>: <code>u32 size</code><br>
<code>r4</code>: <code>[[Memory Management#enum_MemoryPermission|MemoryPermission]] permissions</code>
<code>r4</code>: <code>[[Memory Management#enum_MemoryPermission|MemoryPermission]] permissions</code>
|
|
<code>r0</code>: <code>Result</code><br>
<code>r0</code>: <code>Result</code><br>
<code>r1</code>: <code>u32 addr_out</code>
<code>r1</code>: <code>u32/void* addr_out</code>
|-
| 0x02
| QueryMemory
|
<code>r2</code>?: <code>u32/void* addr</code>
|
<code>r0</code>: <code>Result</code><br>
<code>r1</code>: <code>u32 base_process_virtual_address</code><br>
<code>r2</code>: <code>u32 size</code><br>
<code>r3</code>: <code>[[Memory Management#enum_MemoryPermission|MemoryPermission]] permission</code><br>
<code>r4</code>: <code>[[Memory_Management#enum_MemoryState|MemoryState]] state</code><br>
<code>r5</code>: <code>[[Memory_Management#enum_PageFlags|PageFlags]] page_flags</code>
|-
| 0x03
| ExitProcess
| None
| None, doesn't return
|-
| 0x04
| GetProcessAffinityMask
|
<code>r0</code>: <code>[out] u8* affinitymask</code><br>
<code>r1</code>: <code>Handle<[[KProcess]]> process</code><br>
<code>r2</code>: <code>s32 processorcount</code>
|
<code>r0</code>: <code>Result</code>
|-
| 0x05
| SetProcessAffinityMask
|
<code>r0</code>: <code>Handle<[[KProcess]]> process</code><br>
<code>r1</code>: <code>[in] const u8* affinitymask</code><br>
<code>r2</code>: <code>s32 processorcount</code>
|
<code>r0</code>: <code>Result</code>
|-
| 0x06
| GetProcessIdealProcessor
|
<code>r1</code>?: <code>Handle<[[KProcess]]> process</code>
|
<code>r0</code>: <code>Result</code><br>
<code>r1</code>: <code>s32 processorid</code><br>
<code>r2</code>: Clobbered?
|-
| 0x07
| SetProcessIdealProcessor
|
<code>r0</code>: <code>Handle<[[KProcess]]> process</code><br>
<code>r1</code>: <code>s32 processorid</code>
|
<code>r0</code>: <code>Result</code><br>
|-
| 0x08
| CreateThread
|
<code>r0</code>: <code>s32 thread_priority</code><br>
<code>r1</code>: <code>ThreadFunc entrypoint</code><br>
<code>r2</code>: <code>u32 arg</code><br>
<code>r3</code>: <code>u32/void* stack_top</code><br>
<code>r4</code>: <code>s32 processor_id</code>
|
<code>r0</code>: <code>Result</code><br>
<code>r1</code>: <code>Handle<[[KThread]]> thread_handle</code>
|-
| 0x09
| ExitThread
| None
| None, doesn't return
|-
| 0x0A
| SleepThread
|
<code>r0-r1</code>: <code>s64 nanoseconds</code>
| None
|-
| 0x0B
| GetThreadPriority
|
<code>r0</code>: Ignored?<br>
<code>r1</code>: <code>Handle thread_handle</code>
|
<code>r0</code>: <code>Result</code><br>
<code>r1</code>: <code>s32 thread_priority</code><br>
<code>r2</code>: Clobbered?
|-
| 0x0C
| SetThreadPriority
|
<code>r0</code>: <code>Handle<[[KThread]]> thread_handle</code><br>
<code>r1</code>: <code>s32 thread_priority</code>
|
<code>r0</code>: <code>Result</code>
|-
| 0x0D
| GetThreadAffinityMask
|
<code>r0</code>: <code>[out] u8* affinitymask</code><br>
<code>r1</code>: <code>Handle<[[KThread]]> thread_handle</code><br>
<code>r2</code>: <code>s32 processorcount</code>
|
<code>r0</code>: <code>Result</code>
|-
| 0x0E
| SetThreadAffinityMask
|
<code>r0</code>: <code>Handle<[[KThread]]> thread_handle</code><br>
<code>r1</code>: <code>[in] const u8* affinitymask</code><br>
<code>r2</code>: <code>s32 processorcount</code>
|
<code>r0</code>: <code>Result</code>
|-
| 0x0F
| GetThreadIdealProcessor
|
<code>r0</code>: Ignored?<br>
<code>r1</code>: <code>Handle<[[KThread]]> thread_handle</code>
|
<code>r0</code>: <code>Result</code><br>
<code>r1</code>: <code>s32 processorid</code>
|-
| 0x10
| SetThreadIdealProcessor
|
<code>r0</code>: <code>Handle<[[KThread]]> thread_handle</code><br>
<code>r1</code>: <code>s32 processorid</code>
|
<code>r0</code>: <code>Result</code>
|-
| 0x11
| GetProcessorID
|
None
|
<code>r0</code>: <code>s32 processorid</code>
|-
| 0x24
| WaitSynchronization1
|
<code>r0</code>: <code>Handle<[[KSynchronizationObject]]> handle</code><br>
<code>r2-r3</code>: <code>s64 timeout</code>
|
<code>r0</code>: <code>Result</code>
|-
|-
| 0x1B
| 0x1B
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| Timer handle, initial_low, interval_low, initial_high, interval_high
| Timer handle, initial_low, interval_low, initial_high, interval_high
| Result
| Result
|-
| 0x28
| GetSystemTick
| None
|
<code>r0</code>: <code>Low 32 bits of the tick count</code>
<br><code>r1</code>: <code>High 32 bits of the tick count</code>
|-
|-
| 0x2D
| 0x2D
| ConnectToPort
| ConnectToPort
| ??, pointer to port name
| ??<br><code>r1</code>: <code>pointer to port name</code>
| Result, handle to [[KClientSession]]
| <code>r0</code>: <code>Result</code><br><code>r1</code>: <code>handle to [[KClientSession]]</code>
|-
|-
| 0x32
| 0x32
| SendSyncRequest
| SendSyncRequest
| handle to [[KClientSession]]
| <code>r0</code>: <code>handle to [[KClientSession]]</code>
| Result
| <code>r0</code>: <code>Result<code>
|}
|}
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