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- /*
- # IDT Zero Divide
- Division by zero causes a Divide Error which Intel notes as `#DE`.
- Expected output: "division by zero handled"
- It is then handled by IDT 0.
- Remember that DE is not *only* for division by zero: it also happens on overflow!
- Thus the name: Division Error, and not Division by zero.
- - http://stackoverflow.com/questions/33029457/what-to-do-in-interrupt-handler-for-divide-by-zero
- */
- #include "common.h"
- BEGIN
- STAGE2
- CLEAR
- PROTECTED_MODE
- IDT_SETUP_ENTRY $0, $handler
- lidt idt_descriptor
- mov $0, %edx
- mov $1, %eax
- mov $0, %ecx
- /* The iret jumps back here! */
- div %ecx
- jmp .
- IDT_START
- IDT_ENTRY
- IDT_END
- handler:
- VGA_PRINT_STRING $message
- /* If we don't do this, we get an infinite loop! */
- mov $1, %ecx
- iret
- message:
- .asciz "division by zero handled"
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