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Kernel: Track previous mode when entering/exiting traps

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This allows us to determine what the previous mode (user or kernel)
was, e.g. in the timer interrupt. This is used e.g. to determine
whether a signal handler should be set up.

Fixes #5096
This commit is contained in:
Tom 2021-01-25 13:19:34 -07:00 • committed by Andreas Kling
parent fa18010477
commit 0bd558081e
6 changed files with 70 additions and 7 deletions
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10
Kernel/Thread.h
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@ -1106,6 +1106,14 @@ public:
u32 ticks_in_user() const { return m_ticks_in_user; }
u32 ticks_in_kernel() const { return m_ticks_in_kernel; }
enum class PreviousMode : u8 {
KernelMode = 0,
UserMode
};
PreviousMode previous_mode() const { return m_previous_mode; }
void set_previous_mode(PreviousMode mode) { m_previous_mode = mode; }
TrapFrame*& current_trap() { return m_current_trap; }
RecursiveSpinLock& get_lock() const { return m_lock; }
#if LOCK_DEBUG
@ -1230,6 +1238,7 @@ private:
NonnullRefPtr<Process> m_process;
ThreadID m_tid { -1 };
TSS32 m_tss;
TrapFrame* m_current_trap { nullptr };
Atomic<u32> m_cpu { 0 };
u32 m_cpu_affinity { THREAD_AFFINITY_DEFAULT };
u32 m_ticks_left { 0 };
@ -1261,6 +1270,7 @@ private:
Atomic<bool> m_is_active { false };
bool m_is_joinable { true };
bool m_handling_page_fault { false };
PreviousMode m_previous_mode { PreviousMode::UserMode };
unsigned m_syscall_count { 0 };
unsigned m_inode_faults { 0 };