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metalsvm/kernel/syscall.c
Stefan Lankes b1a968a82c add first steps to realize the system call stat
2011-09-23 14:49:31 +02:00

379 lines
8.1 KiB
C
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/*
* 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/string.h>
#include <metalsvm/errno.h>
#include <metalsvm/spinlock.h>
#include <metalsvm/time.h>
#include <lwip/opt.h>
#if defined(CONFIG_LWIP) && LWIP_SOCKET
#include <lwip/mem.h>
#include <lwip/raw.h>
#include <lwip/icmp.h>
#include <lwip/netif.h>
#include <lwip/sys.h>
#include <lwip/timers.h>
#include <lwip/inet_chksum.h>
#include <lwip/ip.h>
#include <lwip/sockets.h>
#include <lwip/inet.h>
#include <lwip/err.h>
#endif
static int get_fildes(){
int fd;
for (fd = 0; fd < NR_OPEN; fd++) {
if (per_core(current_task)->fildes_table[fd].node == NULL) {
return fd;
}
}
/* can't get any free fd */
return -EMFILE;
}
static int sys_open(const char* name, int flags, int mode)
{
int fd, check;
fildes_t* file = NULL;
fd = get_fildes();
/* validate the fd */
if (fd < 0)
return fd;
file = &(per_core(current_task)->fildes_table[fd]);
file->offset = 0;
file->mode = mode;
file->flags = flags;
check = open_fs(file, (char*) name);
if (check < 0) {
/* file doesn't exist! */
file->node = NULL;
return check;
}
return fd;
}
#if defined(CONFIG_LWIP) && LWIP_SOCKET
static int sys_socket(int domain, int type, int protocol)
{
int fd;
fildes_t* file = NULL;
fd = get_fildes();
/* validate the fd */
if (fd < 0)
return fd;
file = &(per_core(current_task)->fildes_table[fd]);
file->offset = lwip_socket(domain, type, protocol);
file->mode = 0;
file->flags = 0;
file->node = findnode_fs("/dev/socket");
return fd;
}
static int sys_accept(int s, struct sockaddr* addr, socklen_t* addrlen)
{
int fd;
fildes_t* file = NULL;
fd = get_fildes();
/* validate the fd */
if (fd < 0)
return fd;
file = &(per_core(current_task)->fildes_table[fd]);
file->offset = lwip_accept(s, addr, addrlen);
file->mode = 0;
file->flags = 0;
file->node = findnode_fs("/dev/socket");
return fd;
}
#endif
static int sys_close(int fd)
{
fildes_t* file = &(per_core(current_task)->fildes_table[fd]);
close_fs(file);
file->node = NULL;
file->offset = 0;
file->mode = 0;
file->flags = 0;
return 0;
}
static int sys_lseek(int fd, off_t pos, int origin)
{
int ret = -EINVAL;
fildes_t* file = &(per_core(current_task)->fildes_table[fd]);
if (BUILTIN_EXPECT(!((file->node->type == FS_FILE)
|| (file->node->type == FS_CHARDEVICE)), 0))
return -EINVAL;
switch(origin)
{
case SEEK_SET: { /* set file offset to offset */
file->offset = pos;
ret = 0;
break;
}
case SEEK_CUR: { /* set file offset to current plus offset */
ret = pos + file->offset;
break;
}
case SEEK_END: { /* set file offset to EOF plus offset */
file->offset = pos + file->node->block_size;
ret = 0;
break;
}
default:
ret = -EINVAL;
break;
}
return ret;
}
static int sys_sbrk(int incr)
{
task_t* task = per_core(current_task);
vma_t* tmp = NULL;
int ret;
spinlock_lock(&task->vma_lock);
tmp = task->vma_list;
while(tmp && !((task->end_heap >= tmp->start) && (task->end_heap <= tmp->end)))
tmp = tmp->next;
ret = (int) task->end_heap;
task->end_heap += incr;
if (task->end_heap < task->start_heap)
task->end_heap = task->start_heap;
// resize virtual memory area
if (tmp && (tmp->end <= task->end_heap))
tmp->end = task->end_heap;
spinlock_unlock(&task->vma_lock);
return ret;
}
int syscall_handler(uint32_t sys_nr, ...)
{
int ret = -EINVAL;
va_list vl;
check_workqueues();
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 fd = va_arg(vl, int);
const char* buf = va_arg(vl, const char*);
size_t len = va_arg(vl, size_t);
if (fd >= 0)
ret = write_fs(&(per_core(current_task)->fildes_table[fd]),
(uint8_t*)buf, len);
break;
}
case __NR_open: {
const char* name = va_arg(vl, const char*);
int flags = va_arg(vl, int);
int mode = va_arg(vl, int);
ret = sys_open(name, flags, mode);
break;
}
case __NR_close: {
int fd = va_arg(vl, int);
if (fd >= 0)
ret = sys_close(fd);
break;
}
case __NR_stat: {
const char* name = va_arg(vl, const char*);
//struct stat* st = va_arg(vl, struct stat*);
ret = -EINVAL;
break;
}
case __NR_read: {
int fd = va_arg(vl, int);
const char* buf = va_arg(vl, const char*);
size_t len = va_arg(vl, size_t);
if (fd >= 0)
ret = read_fs(&(per_core(current_task)->fildes_table[fd]),
(uint8_t*)buf, len);
break;
}
case __NR_lseek: {
int fd = va_arg(vl, int);
off_t pos = va_arg(vl, off_t);
int origin = va_arg(vl, int);
if (fd >= 0)
ret = sys_lseek(fd, pos, origin);
break;
}
case __NR_sbrk: {
int incr = va_arg(vl, int);
ret = sys_sbrk(incr);
break;
}
case __NR_getpid:
ret = per_core(current_task)->id;
break;
case __NR_fork:
ret = sys_fork();
break;
case __NR_wait: {
int32_t* status = va_arg(vl, int32_t*);
ret = wait(status);
break;
}
case __NR_execve: {
const char* name = va_arg(vl, const char*);
char** argv = va_arg(vl, char**);
char** env = va_arg(vl, char**);
ret = sys_execve(name, argv, env);
break;
}
case __NR_times: {
struct tms* buffer = va_arg(vl, struct tms*);
clock_t* clock = va_arg(vl, clock_t*);
ret = sys_times(buffer, clock);
break;
}
#if defined(CONFIG_LWIP) && LWIP_SOCKET
case __NR_closesocket: {
int fd = va_arg(vl, int);
if (fd < 0) {
ret = -ENOTSOCK;
break;
}
ret = lwip_close(per_core(current_task)->fildes_table[fd].offset);
if (ret < 0)
ret = -errno;
break;
}
case __NR_socket: {
int domain = va_arg(vl, int);
int type = va_arg(vl, int);
int protocol = va_arg(vl, int);
ret = sys_socket(domain, type, protocol);
break;
}
case __NR_connect: {
int fd = va_arg(vl, int);
const struct sockaddr* name = va_arg(vl, const struct sockaddr*);
socklen_t namelen = va_arg(vl, socklen_t);
if (per_core(current_task)->fildes_table[fd].offset < 0) {
ret = -ENOTSOCK;
break;
}
//kprintf("lwip_connect: %p with lenght %i and Socket %i", name, namelen, per_core(current_task)->fildes_table[fd].offset);
ret = lwip_connect(per_core(current_task)->fildes_table[fd].offset, name, namelen);
if (ret < 0)
ret = -errno;
break;
}
case __NR_bind: {
int fd = va_arg(vl, int);
const struct sockaddr* name = va_arg(vl, const struct sockaddr*);
socklen_t namelen = va_arg(vl, socklen_t);
if (per_core(current_task)->fildes_table[fd].offset < 0) {
ret = -ENOTSOCK;
break;
}
ret = lwip_bind(per_core(current_task)->fildes_table[fd].offset, name, namelen);
if (ret < 0)
ret = -errno;
break;
}
case __NR_listen: {
int fd = va_arg(vl, int);
int backlog = va_arg(vl, int);
if (per_core(current_task)->fildes_table[fd].offset < 0) {
ret = -ENOTSOCK;
break;
}
ret = lwip_listen(per_core(current_task)->fildes_table[fd].offset, backlog);
if (ret < 0)
ret = -errno;
break;
}
case __NR_accept: {
int fd = va_arg(vl, int);
struct sockaddr* addr = va_arg(vl, struct sockaddr*);
socklen_t* addrlen = va_arg(vl, socklen_t*);
if (per_core(current_task)->fildes_table[fd].offset < 0) {
ret = -ENOTSOCK;
break;
}
ret = sys_accept(per_core(current_task)->fildes_table[fd].offset, addr, addrlen);
if (ret < 0)
ret = -errno;
break;
}
#endif
default:
kputs("invalid system call\n");
ret = -ENOSYS;
break;
};
va_end(vl);
return ret;
}
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