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https://github.com/Mathewnd/Astral.git
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Matheus
161 lines
1.7 KiB
NASM
161 lines
1.7 KiB
NASM
section .text
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%macro pushregs 0
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push rbp
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mov rbp, [rsp+24] ; save CS for usermode checking
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; check and patch ss if it is invalid because of the syscall instruction
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cmp qword [rsp+48], 0x33
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jne .keepgoing
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mov qword [rsp+48], 0x43
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.keepgoing:
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push rsi
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push rdi
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push r15
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push r14
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push r13
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push r12
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push r11
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push r10
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push r9
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push r8
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push rdx
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push rcx
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push rbx
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push rax
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cmp rbp,0x3b
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jne .noswapgs
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swapgs
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.noswapgs:
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mov rax, ds
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push rax
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mov rax, es
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push rax
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mov rax, fs
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push rax
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mov rax, gs
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push rax
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; now use kernel segments for data
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;mov rax, 0x38
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;mov ds, rax
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;mov es, rax
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;mov ss, rax
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mov rdi,cr2
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push rdi
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%endmacro
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%macro popregs 0
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add rsp, 24 ; cr2 gs fs
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pop rax
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mov es,rax
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pop rax
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mov ds,rax
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pop rax
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pop rbx
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pop rcx
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pop rdx
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pop r8
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pop r9
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pop r10
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pop r11
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pop r12
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pop r13
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pop r14
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pop r15
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pop rdi
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pop rsi
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; check and patch ss if it is invalid because of the syscall instruction
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cmp qword [rsp+48], 0x33
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jne .nofix
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mov qword [rsp+48], 0x43
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.nofix:
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pop rbp
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add rsp,8 ; remove error code
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cmp qword [rsp+8], 0x3b ; user cs
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jne .noswap
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swapgs
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.noswap:
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%endmacro
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%macro isr 2
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global %1
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%1:
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push qword 0 ; error code for regs struct
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pushregs
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mov rdi,rsp
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cld
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extern %2
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call %2
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popregs
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iretq
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%endmacro
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%macro except 2
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global %1
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%1:
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pushregs
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mov rdi,rsp
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cld
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sti
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extern %2
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call %2
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cli
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popregs
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iretq
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%endmacro
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extern asmisr_panic
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asmisr_panic:
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cli
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.hlt:
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hlt
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jmp .hlt ; NMI stuff
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except asmisr_pagefault, isr_pagefault
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isr asmisr_general, isr_general
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except asmisr_except, isr_except
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isr asmisr_lapicnmi, isr_lapicnmi
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isr asmisr_mmuinval, isr_mmuinval
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isr asmisr_ps2kbd, isr_ps2kbd
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isr asmisr_timer, isr_timer
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isr asmisr_simd, isr_simd
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