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sortix--sortix/kernel/syscall.cpp
2014-03-01 14:37:41 +01:00

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1.9 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
syscall.cpp
Handles system calls from user-space.
*******************************************************************************/
#include <stddef.h>
#include <sortix/syscallnum.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/process.h>
#include <sortix/kernel/scheduler.h>
#include <sortix/kernel/syscall.h>
#include <sortix/kernel/thread.h>
namespace Sortix {
namespace Syscall {
extern "C"
{
size_t SYSCALL_MAX;
volatile void* syscall_list[SYSCALL_MAX_NUM];
}
static int sys_bad_syscall()
{
// TODO: Send signal, set errno, or crash/abort process?
Log::PrintF("I am the bad system call!\n");
return -1;
}
void Init()
{
SYSCALL_MAX = SYSCALL_MAX_NUM;
for ( size_t i = 0; i < SYSCALL_MAX_NUM; i++ )
syscall_list[i] = (void*) sys_bad_syscall;
}
void Register(size_t index, void* function)
{
if ( SYSCALL_MAX_NUM <= index )
PanicF("Attempted to register system call %p to index %zu, but "
"SYSCALL_MAX_NUM = %zu", function, index, SYSCALL_MAX_NUM);
syscall_list[index] = function;
}
} // namespace Syscall
} // namespace Sortix