ladybird/Kernel/Syscalls/get_stack_bounds.cpp

32 lines
1.0 KiB
C++

/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Memory/Region.h>
#include <Kernel/Tasks/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();
return address_space().with([&](auto& space) -> ErrorOr<FlatPtr> {
auto* stack_region = 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;
});
}
}