mirror of
https://github.com/SerenityOS/serenity
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54 lines
2.2 KiB
C++
54 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Process.h>
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#include <Kernel/VM/MemoryManager.h>
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namespace Kernel {
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int Process::sys$get_stack_bounds(FlatPtr* user_stack_base, size_t* user_stack_size)
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{
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if (!validate_write_typed(user_stack_base))
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return -EFAULT;
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if (!validate_write_typed(user_stack_size))
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return -EFAULT;
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FlatPtr stack_pointer = Thread::current()->get_register_dump_from_stack().userspace_esp;
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auto* stack_region = MM.find_region_from_vaddr(*this, VirtualAddress(stack_pointer));
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if (!stack_region) {
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ASSERT_NOT_REACHED();
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return -EINVAL;
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}
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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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copy_to_user(user_stack_base, &stack_base);
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copy_to_user(user_stack_size, &stack_size);
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return 0;
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}
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}
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