handle_exception:
        push %r15
        push %r14
        push %r13
        push %r12
        push %r11
        push %r10
        push %r9
        push %r8

        push %rdi
        push %rsi
        push %rbp
        push %rbx
        push %rdx
        push %rcx
        push %rax
        mov %rsp, %rdi

        call route_exception

        pop %rax
        pop %rcx
        pop %rdx
        pop %rbx
        pop %rbp
        pop %rsi
        pop %rdi
        pop %r8
        pop %r9
        pop %r10
        pop %r11
        pop %r12
        pop %r13
        pop %r14
        pop %r15

        /* Discard vector and error code. */
        add $16, %rsp
        iretq

/*
 * Build the handle_exception wrappers which push the vector/error code on the
 * stack and an array of pointers to those wrappers.
 */
.pushsection .rodata
.globl idt_handlers
idt_handlers:
.popsection

.macro HANDLERS has_error from to
        vector = \from
        .rept \to - \from + 1
        .align 8

        /* Fetch current address and append it to idt_handlers. */
666 :
.pushsection .rodata
        .quad 666b
.popsection

        .if ! \has_error
        pushq $0
        .endif
        pushq $vector
        jmp handle_exception
        vector = vector + 1
        .endr
.endm

.global idt_handler_code
idt_handler_code:
        HANDLERS has_error=0 from=0  to=7
        HANDLERS has_error=1 from=8  to=8
        HANDLERS has_error=0 from=9  to=9
        HANDLERS has_error=1 from=10 to=14
        HANDLERS has_error=0 from=15 to=16
        HANDLERS has_error=1 from=17 to=17
        HANDLERS has_error=0 from=18 to=255

.section        .note.GNU-stack, "", %progbits