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kern: fix minor assembly bugs, avoid unnecessary function call in KScheduler hotloop

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This commit is contained in:
Michael Scire 2021-10-28 19:16:23 -07:00
parent 92321ccbc8
commit d1f3c4904b
6 changed files with 20 additions and 16 deletions
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3
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_assembly_offsets.h
View file

@ -19,6 +19,9 @@
/* TODO: Different header for this? */
#define AMS_KERN_NUM_SUPERVISOR_CALLS 0xC0
/* ams::kern::KThread, https://github.com/Atmosphere-NX/Atmosphere/blob/master/libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp */
#define THREAD_THREAD_CONTEXT 0xD0
/* ams::kern::KThread::StackParameters, https://github.com/Atmosphere-NX/Atmosphere/blob/master/libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp */
#define THREAD_STACK_PARAMETERS_SIZE 0x30
#define THREAD_STACK_PARAMETERS_SVC_PERMISSION 0x00

19
libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp
View file

@ -405,8 +405,6 @@ namespace ams::kern {
constexpr ThreadState GetState() const { return static_cast<ThreadState>(m_thread_state & ThreadState_Mask); }
constexpr ThreadState GetRawState() const { return m_thread_state; }
NOINLINE KThreadContext *GetContextForSchedulerLoop();
constexpr uintptr_t GetConditionVariableKey() const { return m_condvar_key; }
constexpr uintptr_t GetAddressArbiterKey() const { return m_condvar_key; }
@ -624,9 +622,7 @@ namespace ams::kern {
void OnTimer();
void DoWorkerTaskImpl();
public:
static constexpr bool IsConditionVariableThreadTreeValid() {
return ConditionVariableThreadTreeTraits::IsValid();
}
static consteval bool IsKThreadStructurallyValid();
static KThread *GetThreadFromId(u64 thread_id);
static Result GetThreadList(s32 *out_num_threads, ams::kern::svc::KUserPointer<u64 *> out_thread_ids, s32 max_out_count);
@ -634,7 +630,18 @@ namespace ams::kern {
using ConditionVariableThreadTreeType = ConditionVariableThreadTree;
};
static_assert(alignof(KThread) == 0x10);
static_assert(KThread::IsConditionVariableThreadTreeValid());
consteval bool KThread::IsKThreadStructurallyValid() {
/* Check that the condition variable tree is valid. */
static_assert(ConditionVariableThreadTreeTraits::IsValid());
/* Check that the assembly offsets are valid. */
static_assert(AMS_OFFSETOF(KThread, m_thread_context) == THREAD_THREAD_CONTEXT);
return true;
}
static_assert(KThread::IsKThreadStructurallyValid());
class KScopedDisableDispatch {
public:

2
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_exception_asm.s
View file

@ -28,7 +28,7 @@ _ZN3ams4kern3svc25CallReturnFromException64Ev:
stp x20, x21, [sp, #(EXCEPTION_CONTEXT_X20_X21)]
stp x22, x23, [sp, #(EXCEPTION_CONTEXT_X22_X23)]
stp x24, x25, [sp, #(EXCEPTION_CONTEXT_X24_X25)]
stp x26, x26, [sp, #(EXCEPTION_CONTEXT_X26_X27)]
stp x26, x27, [sp, #(EXCEPTION_CONTEXT_X26_X27)]
stp x28, x29, [sp, #(EXCEPTION_CONTEXT_X28_X29)]
/* Call ams::kern::arch::arm64::ReturnFromException(result). */

4
libraries/libmesosphere/source/kern_k_thread.cpp
View file

@ -1315,10 +1315,6 @@ namespace ams::kern {
}
}
KThreadContext *KThread::GetContextForSchedulerLoop() {
return std::addressof(this->GetContext());
}
KThread *KThread::GetThreadFromId(u64 thread_id) {
/* Lock the list. */
KThread::ListAccessor accessor;

4
mesosphere/kernel/source/arch/arm64/kern_exception_handlers_asm.s
View file

@ -376,7 +376,7 @@ _ZN3ams4kern4arch5arm6430EL1SynchronousExceptionHandlerEv:
stp x26, x27, [sp, #(EXCEPTION_CONTEXT_X26_X27)]
stp x28, x29, [sp, #(EXCEPTION_CONTEXT_X28_X29)]
mrs x20, sp_el0
ldr x20, [sp]
mrs x21, elr_el1
mrs x22, spsr_el1
mrs x23, tpidr_el0
@ -529,7 +529,7 @@ _ZN3ams4kern4arch5arm6421EL1SystemErrorHandlerEv:
stp x26, x27, [sp, #(EXCEPTION_CONTEXT_X26_X27)]
stp x28, x29, [sp, #(EXCEPTION_CONTEXT_X28_X29)]
mrs x20, sp_el0
ldr x20, [sp]
mrs x21, elr_el1
mrs x22, spsr_el1
mrs x23, tpidr_el0

4
mesosphere/kernel/source/arch/arm64/kern_k_scheduler_asm.s
View file

@ -183,9 +183,7 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
/* Get the highest priority thread's context, and save it. */
/* ams::kern::KThread::GetContextForSchedulerLoop() */
mov x0, x21
bl _ZN3ams4kern7KThread26GetContextForSchedulerLoopEv
mov x22, x0
add x22, x21, #(THREAD_THREAD_CONTEXT)
/* Prepare to try to acquire the context lock. */
add x1, x22, #(THREAD_CONTEXT_LOCKED)