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93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
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/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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syscall.h
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Handles system calls from userspace safely.
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******************************************************************************/
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#include "platform.h"
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#include "syscall.h"
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#include "scheduler.h"
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#include "iirqhandler.h"
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#include "isr.h"
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#include "globals.h"
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#include "iprintable.h"
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#include "log.h"
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#include "panic.h"
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namespace Sortix
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{
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namespace Syscall
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{
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void SysStdOutPrint(CPU::InterruptRegisters* R)
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{
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#ifdef PLATFORM_X86
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// TODO: Validate our input pointer is legal for the current thread/process!
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R->eax = (uint32_t) Log::Print((const char*) R->ebx);
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#else
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#warning "This syscall is not supported on this arch"
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while(true);
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#endif
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}
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const size_t NumSyscalls = 5;
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const Syscall Syscalls[NumSyscalls] =
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{
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&Scheduler::SysCreateThread,
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&Scheduler::SysExitThread,
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&Scheduler::SysSleep,
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&Scheduler::SysUSleep,
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&SysStdOutPrint,
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};
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void Init()
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{
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register_interrupt_handler(0x80, &OnCall);
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}
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void OnCall(CPU::InterruptRegisters* registers)
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{
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#ifdef PLATFORM_X86
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size_t callId = registers->eax;
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// Make sure the requested syscall exists.
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if ( callId >= NumSyscalls ) { return; }
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#ifdef USING_OLD_SYSCALL
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Syscalls[registers->eax](registers);
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#else
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Thread* thread = CurrentThread();
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thread->BeginSyscall(registers);
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Syscalls[registers->eax](thread);
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thread->OnSysReturn();
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#endif
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#else
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#warning "System calls are not available on this platform"
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while(true);
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#endif
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}
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}
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}
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