section .sharedFunctions

extern onInterrupt
extern temporaryESP

global interruptStack
interruptStack: resb 1024

interruptReturn:
  pop eax
  pop ebx
  pop ecx
  pop edx
  ret

exceptionAbort:
  mov eax, cr3
  cmp eax, 0x500000
  je $
  mov eax, 0x500000
  mov cr3, eax
  mov eax, [temporaryESP]
  mov esp, eax
  pop ebp
  ret

handleInterrupt:
.saveRegisters:
  push eax
  push ebx
  push ecx
  push edx
  mov eax, cr3
  push eax
.checkException:
  mov eax, [esp+20]
  cmp eax, 31
  jng exceptionAbort
.normalInterrupt:
  push eax
.checkUsermode:
  mov eax, cr3
  cmp eax, 0x500000
  je .kernelPages
.saveRegistersToOldStack:
  mov eax, [esp+44] ; eax = old esp
  mov ebx, [esp+32] ; ebx = old eip
  mov [eax], ebx ; virtual push
  add eax, 4
.pushRegisters:
  mov ebx, [esp+4] ; ebx = old edx
  mov [eax], ebx ; virtual push ebx
  add eax, 4
  mov ebx, [esp+8] ; ebx = old ecx
  mov [eax], ebx ; virtual push ebx
  add eax, 4
  mov ebx, [esp+12] ; ebx = old ebx
  mov [eax], ebx ; virtual push ebx
  add eax, 4
  mov ebx, [esp+16] ; ebx = old edx
  mov [eax], ebx ; virtual push ebx
  add eax, 4
.kernelPages:
  push eax
  mov eax, 0x500000
  mov cr3, eax
.callHandler:
  push interruptReturn
  call onInterrupt
.iretNow:
  add esp, 40
  iret

%macro interruptHandler 1
  ALIGN 4
  global idtHandler%1
idtHandler%1:
  push 0
  push %1
  jmp handleInterrupt
%endmacro

%macro interruptHandlerError 1
  align 4
  global idtHandler%1
idtHandler%1:
  push %1
  jmp handleInterrupt
%endmacro

interruptHandler 0
interruptHandler 1
interruptHandler 2
interruptHandler 3
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interruptHandlerError 8
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