metalsvm/kernel/syscall.c

83 lines
1.7 KiB
C

/*
* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
* RWTH Aachen University
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of MetalSVM.
*/
#include <metalsvm/stdarg.h>
#include <metalsvm/stdio.h>
#include <metalsvm/syscall.h>
#include <metalsvm/tasks.h>
#include <metalsvm/errno.h>
static int sys_write(int fildes, const char *buf, size_t len)
{
int i;
if (BUILTIN_EXPECT(!buf, 0))
return -1;
for (i = 0; i<len; i++, buf++) {
kputchar(*buf);
}
return len;
}
int syscall_handler(uint32_t sys_nr, ...)
{
int ret = -EINVAL;
va_list vl;
va_start(vl, sys_nr);
switch(sys_nr)
{
case __NR_exit:
sys_exit(va_arg(vl, uint32_t));
ret = 0;
break;
case __NR_write: {
int fildes = va_arg(vl, int);
const char* buf = va_arg(vl, const char*);
size_t len = va_arg(vl, size_t);
ret = sys_write(fildes, buf, len);
break;
}
case __NR_open:
ret = 1;
break;
case __NR_close:
ret = 0;
break;
case __NR_getpid:
ret = per_core(current_task)->id;
break;
case __NR_fork:
ret = sys_fork();
break;
case __NR_fstat:
default:
kputs("invalid system call\n");
ret = -ENOSYS;
break;
};
va_end(vl);
return ret;
}