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Kernel: Assert on page fault during IRQ

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We're not equipped to deal with page faults during an IRQ handler,
so add an assertion so we can immediately tell what's wrong.

This is why profiling sometimes hangs the system -- walking the stack
of the profiled thread causes a page fault and things fall apart.
This commit is contained in:
Andreas Kling 2020-02-21 12:26:12 +01:00
parent 2a679f228e
commit d46071c08f
4 changed files with 9 additions and 0 deletions
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4
Kernel/Arch/i386/CPU.cpp
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@ -545,14 +545,18 @@ void load_task_register(u16 selector)
asm("ltr %0" ::"r"(selector));
}
u32 g_in_irq;
void handle_irq(RegisterState regs)
{
clac();
++g_in_irq;
ASSERT(regs.isr_number >= 0x50 && regs.isr_number <= 0x5f);
u8 irq = (u8)(regs.isr_number - 0x50);
if (s_irq_handler[irq])
s_irq_handler[irq]->handle_irq();
PIC::eoi(irq);
--g_in_irq;
}
void sse_init()