diff options
Diffstat (limited to 'src/kernel/arch/amd64/interrupts/isr_stub.s')
| -rw-r--r-- | src/kernel/arch/amd64/interrupts/isr_stub.s | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/kernel/arch/amd64/interrupts/isr_stub.s b/src/kernel/arch/amd64/interrupts/isr_stub.s new file mode 100644 index 0000000..e45c1c1 --- /dev/null +++ b/src/kernel/arch/amd64/interrupts/isr_stub.s @@ -0,0 +1,81 @@ +.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: |