ladybird/Kernel/Syscalls/get_stack_bounds.cpp
Andreas Kling 79fa9765ca Kernel: Replace KResult and KResultOr<T> with Error and ErrorOr<T>
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace!
This was a slightly tedious refactoring that took a long time, so it's
not unlikely that some bugs crept in.

Nevertheless, it does pass basic functionality testing, and it's just
real nice to finally see the same pattern in all contexts. :^)
2021-11-08 01:10:53 +01:00

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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Memory/Region.h>
#include <Kernel/Process.h>
namespace Kernel {
ErrorOr<FlatPtr> Process::sys$get_stack_bounds(Userspace<FlatPtr*> user_stack_base, Userspace<size_t*> user_stack_size)
{
VERIFY_NO_PROCESS_BIG_LOCK(this);
auto& regs = Thread::current()->get_register_dump_from_stack();
FlatPtr stack_pointer = regs.userspace_sp();
auto* stack_region = address_space().find_region_containing(Memory::VirtualRange { VirtualAddress(stack_pointer), 1 });
// The syscall handler should have killed us if we had an invalid stack pointer.
VERIFY(stack_region);
FlatPtr stack_base = stack_region->range().base().get();
size_t stack_size = stack_region->size();
TRY(copy_to_user(user_stack_base, &stack_base));
TRY(copy_to_user(user_stack_size, &stack_size));
return 0;
}
}