41 lines
1.1 KiB
ArmAsm
41 lines
1.1 KiB
ArmAsm
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: AMD64 bugcheck wrapper
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* Author: Chloe M.
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*/
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.text
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.globl KeBugCheck
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KeBugCheck:
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cli /* Disable interrupts */
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cld /* Just in case */
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mov $1, %rax /* Prep the lock */
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xchg %rax, MpLock /* Acquire the lock */
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or %rax, %rax /* Are we another core? */
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jnz .LockOut /* Yes, lock out */
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/*
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* During most cases in which an interrupt occurs, the processor
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* is to automatically switch to its own interrupt stack and during
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* such cases it is guaranteed that the stack is safe. However, we still
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* cannot trust the stack as we do not know if we are coming from an interrupt
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* or not and thus need to update it to avoid dodgy states from worsening our
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* problem... Whatever it is...
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*/
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lea StackTop(%rip), %rsp
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/* From here we can call the actual bugcheck handler */
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call KiBugCheck
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.LockOut:
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hlt
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jmp .LockOut
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.section .data
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MpLock: .quad 0
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/* Our bugcheck stack */
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Stack: .fill 4096, 1, 0
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StackTop:
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