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kern: exception flags are now atomic.

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This is a really weird one, because they didn't actually update the
code which updates these flags in asm, these still use ldrb/orr/strb.
But every access to these via c++ is now an atomic ldxrb/stxrb loop.
Maybe they just forgot to update the asm?
This commit is contained in:
Michael Scire
2025-11-11 19:34:34 -07:00
parent 5b14d1f2b1
commit 5cb14dcabc
2 changed files with 38 additions and 38 deletions
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8
libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp
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@@ -105,7 +105,7 @@ namespace ams::kern {
util::Atomic<u8> dpc_flags;
u8 current_svc_id;
u8 reserved_2c;
u8 exception_flags;
util::Atomic<u8> exception_flags;
bool is_pinned;
u8 reserved_2f;
u8 reserved_30[0x10];
@@ -417,17 +417,17 @@ namespace ams::kern {
private:
ALWAYS_INLINE void SetExceptionFlag(ExceptionFlag flag) {
MESOSPHERE_ASSERT_THIS();
this->GetStackParameters().exception_flags |= flag;
this->GetStackParameters().exception_flags.FetchOr<std::memory_order_relaxed>(flag);
}
ALWAYS_INLINE void ClearExceptionFlag(ExceptionFlag flag) {
MESOSPHERE_ASSERT_THIS();
this->GetStackParameters().exception_flags &= ~flag;
this->GetStackParameters().exception_flags.FetchAnd<std::memory_order_relaxed>(~flag);
}
ALWAYS_INLINE bool IsExceptionFlagSet(ExceptionFlag flag) const {
MESOSPHERE_ASSERT_THIS();
return this->GetStackParameters().exception_flags & flag;
return this->GetStackParameters().exception_flags.Load<std::memory_order_relaxed>() & flag;
}
public:
/* ALWAYS_INLINE void SetCallingSvc() { return this->SetExceptionFlag(ExceptionFlag_IsCallingSvc); } */