mirror of
https://github.com/SerenityOS/serenity
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1fbf562e7e
Using this abstraction it is possible to compile this file for aarch64.
93 lines
2 KiB
C++
93 lines
2 KiB
C++
/*
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* Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Platform.h>
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#include <AK/Types.h>
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#include <Kernel/Memory/AddressSpace.h>
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namespace Kernel {
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struct ThreadRegisters {
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FlatPtr rdi;
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FlatPtr rsi;
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FlatPtr rbp;
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FlatPtr rsp;
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FlatPtr rbx;
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FlatPtr rdx;
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FlatPtr rcx;
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FlatPtr rax;
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FlatPtr r8;
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FlatPtr r9;
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FlatPtr r10;
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FlatPtr r11;
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FlatPtr r12;
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FlatPtr r13;
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FlatPtr r14;
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FlatPtr r15;
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FlatPtr rip;
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FlatPtr rsp0;
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FlatPtr cs;
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FlatPtr rflags;
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FlatPtr flags() const { return rflags; }
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void set_flags(FlatPtr value) { rflags = value; }
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void set_sp(FlatPtr value) { rsp = value; }
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void set_sp0(FlatPtr value) { rsp0 = value; }
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void set_ip(FlatPtr value) { rip = value; }
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FlatPtr cr3;
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FlatPtr ip() const
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{
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return rip;
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}
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FlatPtr sp() const
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{
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return rsp;
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}
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void set_initial_state(bool is_kernel_process, Memory::AddressSpace& space, FlatPtr kernel_stack_top)
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{
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// Only IF is set when a process boots.
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set_flags(0x0202);
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if (is_kernel_process)
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cs = GDT_SELECTOR_CODE0;
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else
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cs = GDT_SELECTOR_CODE3 | 3;
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cr3 = space.page_directory().cr3();
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if (is_kernel_process) {
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set_sp(kernel_stack_top);
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set_sp0(kernel_stack_top);
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} else {
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// Ring 3 processes get a separate stack for ring 0.
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// The ring 3 stack will be assigned by exec().
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set_sp0(kernel_stack_top);
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}
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}
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void set_entry_function(FlatPtr entry_ip, FlatPtr entry_data)
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{
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set_ip(entry_ip);
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rdi = entry_data; // entry function argument is expected to be in regs.rdi
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}
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void set_exec_state(FlatPtr entry_ip, FlatPtr userspace_sp, Memory::AddressSpace& space)
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{
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cs = GDT_SELECTOR_CODE3 | 3;
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rip = entry_ip;
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rsp = userspace_sp;
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cr3 = space.page_directory().cr3();
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}
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};
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}
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