.section .text
.macro push_state
    pushq %rax
    pushq %rbx
    pushq %rcx
    pushq %rdx
    pushq %rsi
    pushq %rdi
    pushq %rbp
    pushq %r8
    pushq %r9
    pushq %r10
    pushq %r11
    pushq %r12
    pushq %r13
    pushq %r14
    pushq %r15
.endm

.macro pop_state
    popq %r15
    popq %r14
    popq %r13
    popq %r12
    popq %r11
    popq %r10
    popq %r9
    popq %r8
    popq %rbp
    popq %rdi
    popq %rsi
    popq %rdx
    popq %rcx
    popq %rbx
    popq %rax
.endm

.macro swapgs_if_necessary
    cmpq $0x08, 0x8(%rsp)
    je 1f
    swapgs
1:
.endm

.extern __int_handles
.type __isr_header @function
__isr_header:
    push_state
    cld

    movq %rsp, %rdi

isr_break:
    movq 0x78(%rdi), %rax
    movq __int_handles(,%rax,8), %rbx
    call %rbx

    pop_state
    addq $16, %rsp
    swapgs_if_necessary
    iretq
.size __isr_header, . - __isr_header

.macro defn_isr_err num:req
.type __isr\num @function
__isr\num:
    swapgs_if_necessary
    pushq $\num
    jmp __isr_header
.size __isr\num, . - __isr\num
.endm

.macro defn_isr num:req
.type __isr\num @function
__isr\num:
    swapgs_if_necessary
    pushq $0
    pushq $\num
    jmp __isr_header
.size __isr\num, . - __isr\num
.endm

.macro decl_isr num:req
.quad __isr\num
.endm

defn_isr 0
defn_isr 1
defn_isr 2
defn_isr 3
defn_isr 4
defn_isr 5
defn_isr 6
defn_isr 7
defn_isr_err 8
defn_isr 9
defn_isr_err 10
defn_isr_err 11
defn_isr_err 12
defn_isr_err 13
defn_isr_err 14
defn_isr 15
defn_isr 16
defn_isr_err 17
defn_isr 18
defn_isr 19
defn_isr 20
defn_isr_err 21

.altmacro
.set i, 22
.rept 48-22
    defn_isr %i
    .set i, i+1
.endr

.section .data

.global __isrs
.type __isrs @object
__isrs:
    .set i, 0
    .rept 48
        decl_isr %i
        .set i, i+1
    .endr
.size __isrs, . - __isrs