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Kernel/aarch64: Stub out atomic SafeMem functions
These are used in futexes, which are needed if we want to get further in `run-tests`. For now, we have no way to return a non-fatal error if an access fault is raised while executing these, so the kernel will panic. Some would consider this a DoS vulnerability where a malicious userspace app can crash the kernel by passing bogus pointers to it, but I prefer to call it progress :^)
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1 changed files with 16 additions and 15 deletions
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@ -29,34 +29,35 @@ bool safe_memcpy(void* dest_ptr, void const* src_ptr, unsigned long n, void*&)
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return true;
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}
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Optional<bool> safe_atomic_compare_exchange_relaxed(u32 volatile*, u32&, u32)
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Optional<bool> safe_atomic_compare_exchange_relaxed(u32 volatile* var, u32& expected, u32 val)
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{
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TODO_AARCH64();
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return {};
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// FIXME: Handle access faults.
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return AK::atomic_compare_exchange_strong(var, expected, val, AK::memory_order_relaxed);
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}
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Optional<u32> safe_atomic_load_relaxed(u32 volatile*)
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Optional<u32> safe_atomic_load_relaxed(u32 volatile* var)
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{
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TODO_AARCH64();
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return {};
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// FIXME: Handle access faults.
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return AK::atomic_load(var, AK::memory_order_relaxed);
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}
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Optional<u32> safe_atomic_fetch_add_relaxed(u32 volatile*, u32)
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Optional<u32> safe_atomic_fetch_add_relaxed(u32 volatile* var, u32 val)
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{
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TODO_AARCH64();
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return {};
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// FIXME: Handle access faults.
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return AK::atomic_fetch_add(var, val, AK::memory_order_relaxed);
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}
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Optional<u32> safe_atomic_exchange_relaxed(u32 volatile*, u32)
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Optional<u32> safe_atomic_exchange_relaxed(u32 volatile* var, u32 val)
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{
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TODO_AARCH64();
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return {};
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// FIXME: Handle access faults.
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return AK::atomic_exchange(var, val, AK::memory_order_relaxed);
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}
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bool safe_atomic_store_relaxed(u32 volatile*, u32)
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bool safe_atomic_store_relaxed(u32 volatile* var, u32 val)
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{
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TODO_AARCH64();
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return {};
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// FIXME: Handle access faults.
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AK::atomic_store(var, val);
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return true;
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}
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bool handle_safe_access_fault(RegisterState&, FlatPtr)
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