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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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3
Kernel/Arch/i386/CPU.h
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@ -1078,6 +1078,7 @@ private:
struct TrapFrame {
u32 prev_irq_level;
TrapFrame* next_trap;
RegisterState* regs; // must be last
TrapFrame() = delete;
@ -1087,7 +1088,7 @@ struct TrapFrame {
TrapFrame& operator=(TrapFrame&&) = delete;
};
#define TRAP_FRAME_SIZE (2 * 4)
#define TRAP_FRAME_SIZE (3 * 4)
static_assert(TRAP_FRAME_SIZE == sizeof(TrapFrame));
extern "C" void enter_trap_no_irq(TrapFrame*);