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