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kern: invoke supervisor mode thread functions from C++ context with valid stack frame

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This commit is contained in:
Michael Scire 2024-10-09 22:01:45 -07:00 committed by SciresM
parent 23ba31da1f
commit 9cfd535568
2 changed files with 15 additions and 1 deletions
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9
libraries/libmesosphere/source/arch/arm64/kern_k_thread_context.cpp
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@ -21,6 +21,15 @@ namespace ams::kern::arch::arm64 {
void UserModeThreadStarter(); void UserModeThreadStarter();
void SupervisorModeThreadStarter(); void SupervisorModeThreadStarter();
void InvokeSupervisorModeThread(uintptr_t argument, uintptr_t entrypoint) {
/* Invoke the function. */
using SupervisorModeFunctionType = void (*)(uintptr_t);
reinterpret_cast<SupervisorModeFunctionType>(entrypoint)(argument);
/* Wait forever. */
AMS_INFINITE_LOOP();
}
void OnThreadStart() { void OnThreadStart() {
MESOSPHERE_ASSERT(!KInterruptManager::AreInterruptsEnabled()); MESOSPHERE_ASSERT(!KInterruptManager::AreInterruptsEnabled());
/* Send KDebug event for this thread's creation. */ /* Send KDebug event for this thread's creation. */

7
mesosphere/kernel/source/arch/arm64/kern_k_thread_context_asm.s
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@ -76,6 +76,9 @@ _ZN3ams4kern4arch5arm6427SupervisorModeThreadStarterEv:
/* v */ /* v */
/* | u64 argument | u64 entrypoint | KThread::StackParameters (size 0x30) | */ /* | u64 argument | u64 entrypoint | KThread::StackParameters (size 0x30) | */
/* Clear the link register. */
mov x30, #0
/* Load the argument and entrypoint. */ /* Load the argument and entrypoint. */
ldp x0, x1, [sp], #0x10 ldp x0, x1, [sp], #0x10
@ -84,4 +87,6 @@ _ZN3ams4kern4arch5arm6427SupervisorModeThreadStarterEv:
/* Mask I bit in DAIF */ /* Mask I bit in DAIF */
msr daifclr, #2 msr daifclr, #2
br x1
/* Invoke the function (by calling ams::kern::arch::arm64::InvokeSupervisorModeThread(argument, entrypoint)). */
b _ZN3ams4kern4arch5arm6426InvokeSupervisorModeThreadEmm