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.section .shared
.global _isr_stubs
_isr_stubs:
.rept 256
.set _stub_start, .
cli
call _isr_stage2
.if . - _stub_start > 8
.error "isr stubs over maximum size"
.abort
.endif
.align 8
.endr
_isr_stage2:
// pushal order, without %esp
push %rax
push %rcx
push %rdx
push %rbx
push %rbp
push %rsi
push %rdi
push %r8
push %r9
push %r10
push %r11
push %r12
push %r13
push %r14
push %r15
// convert the return address into the vector nr
mov 120(%rsp), %rdi
sub $_isr_stubs, %rdi
shr $3, %rdi
lea 128(%rsp), %rsi // second argument - IRET stack frame
// load kernel paging
mov %cr3, %rbx
push %rbx
mov $pml4_identity, %rbx
mov %rbx, %cr3
mov %rsp, %rbp
mov $_isr_big_stack, %rsp
call isr_stage3
mov %rbp, %rsp
pop %rax // restore old cr3
mov %rax, %cr3
// restore registers
pop %r15
pop %r14
pop %r13
pop %r12
pop %r11
pop %r10
pop %r9
pop %r8
pop %rdi
pop %rsi
pop %rbp
pop %rbx
pop %rdx
pop %rcx
pop %rax
add $8, %rsp // skip call's return address
iretq
.align 8
// TODO overflow check
.skip 256 // seems to be enough
.global _isr_mini_stack
_isr_mini_stack:
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