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52f9aaa823
Right now we're using the FS segment for our per-CPU struct. On x86_64 there's an instruction to switch between a kernel and usermode GS segment (swapgs) which we could use. This patch doesn't update the rest of the code to use swapgs but it prepares for that by using the GS segment instead of the FS segment.
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/x86/DescriptorTable.h>
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#include <Kernel/Arch/x86/TrapFrame.h>
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// clang-format off
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asm(
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".globl interrupt_common_asm_entry\n"
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"interrupt_common_asm_entry: \n"
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" pusha\n"
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" pushl %ds\n"
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" pushl %es\n"
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" pushl %fs\n"
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" pushl %gs\n"
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" pushl %ss\n"
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" mov $" __STRINGIFY(GDT_SELECTOR_DATA0) ", %ax\n"
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" mov %ax, %ds\n"
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" mov %ax, %es\n"
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" mov $" __STRINGIFY(GDT_SELECTOR_PROC) ", %ax\n"
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" mov %ax, %gs\n"
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" pushl %esp \n" // set TrapFrame::regs
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" subl $" __STRINGIFY(TRAP_FRAME_SIZE - 4) ", %esp \n"
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" movl %esp, %ebx \n" // save pointer to TrapFrame
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" pushl %ebx \n"
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" cld\n"
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" call enter_trap \n"
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" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
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" call handle_interrupt\n"
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" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
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".globl common_trap_exit \n"
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"common_trap_exit: \n"
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// another thread may have handled this trap at this point, so don't
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// make assumptions about the stack other than there's a TrapFrame
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// and a pointer to it.
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" call exit_trap \n"
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" addl $" __STRINGIFY(TRAP_FRAME_SIZE + 4) ", %esp\n" // pop TrapFrame and pointer to it
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".globl interrupt_common_asm_exit \n"
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"interrupt_common_asm_exit: \n"
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" addl $4, %esp\n" // pop %ss
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" popl %gs\n"
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" popl %fs\n"
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" popl %es\n"
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" popl %ds\n"
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" popa\n"
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" addl $0x4, %esp\n" // skip exception_code, isr_number
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" iret\n"
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);
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// clang-format on
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