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1cffecbe8d
The non CPU specific code of the kernel shouldn't need to deal with architecture specific registers, and should instead deal with an abstract view of the machine. This allows us to remove a variety of architecture specific ifdefs and helps keep the code slightly more portable. We do this by exposing the abstract representation of instruction pointer, stack pointer, base pointer, return register, etc on the RegisterState struct.
31 lines
955 B
C++
31 lines
955 B
C++
/*
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* Copyright (c) 2018-2021, 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/Panic.h>
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#include <Kernel/Process.h>
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#include <Kernel/VM/Region.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$get_stack_bounds(Userspace<FlatPtr*> user_stack_base, Userspace<size_t*> user_stack_size)
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{
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auto& regs = Thread::current()->get_register_dump_from_stack();
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FlatPtr stack_pointer = regs.userspace_sp();
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auto* stack_region = space().find_region_containing(Range { VirtualAddress(stack_pointer), 1 });
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// The syscall handler should have killed us if we had an invalid stack pointer.
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VERIFY(stack_region);
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FlatPtr stack_base = stack_region->range().base().get();
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size_t stack_size = stack_region->size();
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if (!copy_to_user(user_stack_base, &stack_base))
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return EFAULT;
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if (!copy_to_user(user_stack_size, &stack_size))
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return EFAULT;
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return 0;
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}
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}
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