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https://github.com/EnderIce2/Fennix.git
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77 lines
2.1 KiB
NASM
77 lines
2.1 KiB
NASM
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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[BITS 64]
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%macro PushAllSC 0
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push rax
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push rbx
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push rcx
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push rdx
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push rsi
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push rdi
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push rbp
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push r8
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push r9
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push r10
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push r11
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push r12
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push r13
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push r14
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push r15
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%endmacro
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%macro PopAllSC 0
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pop r15
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pop r14
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pop r13
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pop r12
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pop r11
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pop r10
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pop r9
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pop r8
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pop rbp
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pop rdi
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pop rsi
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pop rdx
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pop rcx
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pop rbx
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%endmacro
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ALIGN 4096
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extern SystemCallsHandler
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global SystemCallHandlerStub
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SystemCallHandlerStub:
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swapgs ; Swap gs and kernelgs
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mov [gs:0x8], rsp ; CPUData->TempStack
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mov rsp, [gs:0x0] ; CPUData->SystemCallStack
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push qword 0x1b ; User data segment
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push qword [gs:0x8] ; Saved stack
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push r11 ; Saved rflags
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push qword 0x23 ; User code segment
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push rcx ; Current instruction pointer
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cld ; Clear direction flag
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PushAllSC ; Push all registers
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mov rdi, rsp ; Pass pointer to registers
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mov rbp, 0 ; Pass 0 as return address
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call SystemCallsHandler ; Call system call handler
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PopAllSC ; Pop all registers except rax
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mov rsp, [gs:0x8] ; Restore stack
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swapgs ; Swap back gs and kernelgs
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sti ; Enable interrupts
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o64 sysret ; Return to user mode
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