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949aef4aef
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. :^)
121 lines
4.1 KiB
C++
121 lines
4.1 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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namespace Kernel {
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int Process::sys$sigprocmask(int how, const sigset_t* set, sigset_t* old_set)
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{
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REQUIRE_PROMISE(sigaction);
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auto current_thread = Thread::current();
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if (old_set) {
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if (!validate_write_typed(old_set))
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return -EFAULT;
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copy_to_user(old_set, ¤t_thread->m_signal_mask);
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}
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if (set) {
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if (!validate_read_typed(set))
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return -EFAULT;
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sigset_t set_value;
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copy_from_user(&set_value, set);
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switch (how) {
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case SIG_BLOCK:
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current_thread->m_signal_mask &= ~set_value;
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break;
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case SIG_UNBLOCK:
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current_thread->m_signal_mask |= set_value;
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break;
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case SIG_SETMASK:
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current_thread->m_signal_mask = set_value;
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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int Process::sys$sigpending(sigset_t* set)
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{
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REQUIRE_PROMISE(stdio);
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if (!validate_write_typed(set))
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return -EFAULT;
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copy_to_user(set, &Thread::current()->m_pending_signals);
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return 0;
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}
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int Process::sys$sigaction(int signum, const sigaction* act, sigaction* old_act)
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{
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REQUIRE_PROMISE(sigaction);
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if (signum < 1 || signum >= 32 || signum == SIGKILL || signum == SIGSTOP)
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return -EINVAL;
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if (!validate_read_typed(act))
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return -EFAULT;
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InterruptDisabler disabler; // FIXME: This should use a narrower lock. Maybe a way to ignore signals temporarily?
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auto& action = Thread::current()->m_signal_action_data[signum];
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if (old_act) {
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if (!validate_write_typed(old_act))
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return -EFAULT;
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copy_to_user(&old_act->sa_flags, &action.flags);
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copy_to_user(&old_act->sa_sigaction, &action.handler_or_sigaction, sizeof(action.handler_or_sigaction));
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}
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copy_from_user(&action.flags, &act->sa_flags);
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copy_from_user(&action.handler_or_sigaction, &act->sa_sigaction, sizeof(action.handler_or_sigaction));
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return 0;
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}
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int Process::sys$sigreturn(RegisterState& registers)
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{
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REQUIRE_PROMISE(stdio);
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SmapDisabler disabler;
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//Here, we restore the state pushed by dispatch signal and asm_signal_trampoline.
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u32* stack_ptr = (u32*)registers.userspace_esp;
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u32 smuggled_eax = *stack_ptr;
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//pop the stored eax, ebp, return address, handler and signal code
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stack_ptr += 5;
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Thread::current()->m_signal_mask = *stack_ptr;
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stack_ptr++;
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//pop edi, esi, ebp, esp, ebx, edx, ecx and eax
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memcpy(®isters.edi, stack_ptr, 8 * sizeof(FlatPtr));
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stack_ptr += 8;
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registers.eip = *stack_ptr;
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stack_ptr++;
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registers.eflags = *stack_ptr;
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stack_ptr++;
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registers.userspace_esp = registers.esp;
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return smuggled_eax;
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}
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}
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