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Kernel: Move syscall implementations out of Process.cpp
This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
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73 changed files with 6774 additions and 4485 deletions
113
Kernel/Syscalls/futex.cpp
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113
Kernel/Syscalls/futex.cpp
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/*
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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 <AK/Time.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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void compute_relative_timeout_from_absolute(const timeval& absolute_time, timeval& relative_time)
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{
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// Convert absolute time to relative time of day.
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timeval_sub(absolute_time, kgettimeofday(), relative_time);
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}
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void compute_relative_timeout_from_absolute(const timespec& absolute_time, timeval& relative_time)
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{
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timeval tv_absolute_time;
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timespec_to_timeval(absolute_time, tv_absolute_time);
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compute_relative_timeout_from_absolute(tv_absolute_time, relative_time);
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}
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WaitQueue& Process::futex_queue(i32* userspace_address)
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{
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auto& queue = m_futex_queues.ensure((FlatPtr)userspace_address);
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if (!queue)
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queue = make<WaitQueue>();
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return *queue;
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}
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int Process::sys$futex(const Syscall::SC_futex_params* user_params)
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{
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REQUIRE_PROMISE(thread);
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Syscall::SC_futex_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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i32* userspace_address = params.userspace_address;
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int futex_op = params.futex_op;
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i32 value = params.val;
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const timespec* user_timeout = params.timeout;
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if (!validate_read_typed(userspace_address))
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return -EFAULT;
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if (user_timeout && !validate_read_typed(user_timeout))
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return -EFAULT;
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switch (futex_op) {
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case FUTEX_WAIT: {
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i32 user_value;
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copy_from_user(&user_value, userspace_address);
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if (user_value != value)
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return -EAGAIN;
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timespec ts_abstimeout { 0, 0 };
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if (user_timeout && !validate_read_and_copy_typed(&ts_abstimeout, user_timeout))
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return -EFAULT;
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WaitQueue& wait_queue = futex_queue(userspace_address);
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timeval* optional_timeout = nullptr;
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timeval relative_timeout { 0, 0 };
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if (user_timeout) {
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compute_relative_timeout_from_absolute(ts_abstimeout, relative_timeout);
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optional_timeout = &relative_timeout;
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}
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// FIXME: This is supposed to be interruptible by a signal, but right now WaitQueue cannot be interrupted.
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Thread::BlockResult result = Thread::current()->wait_on(wait_queue, "Futex", optional_timeout);
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if (result == Thread::BlockResult::InterruptedByTimeout) {
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return -ETIMEDOUT;
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}
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break;
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}
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case FUTEX_WAKE:
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if (value == 0)
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return 0;
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if (value == 1) {
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futex_queue(userspace_address).wake_one();
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} else {
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futex_queue(userspace_address).wake_n(value);
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}
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break;
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}
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return 0;
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}
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}
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