mirror of
https://github.com/RGBCube/serenity
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28 lines
936 B
C++
28 lines
936 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/Memory/Region.h>
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#include <Kernel/Process.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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VERIFY_NO_PROCESS_BIG_LOCK(this);
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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 = address_space().find_region_containing(Memory::VirtualRange { 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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TRY(copy_to_user(user_stack_base, &stack_base));
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return copy_to_user(user_stack_size, &stack_size);
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}
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}
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