metalsvm/kernel/syscall.c
2012-09-12 15:42:07 +02:00

612 lines
16 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/string.h>
#include <metalsvm/errno.h>
#include <metalsvm/spinlock.h>
#include <metalsvm/time.h>
#include <metalsvm/fs.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(void)
{
task_t* curr_task = per_core(current_task);
int fd;
/*
* Seach the process specific file descriptor table for a free
* descriptor. The new descriptor returned by the call is the lowest
* numbered descriptor currently not in use by the process.
*/
for (fd = 0; fd < NR_OPEN; fd++) {
if (curr_task->fildes_table[fd] == NULL) {
/* Init Filedescriptor */
curr_task->fildes_table[fd] = kmalloc(sizeof(fildes_t));
memset(curr_task->fildes_table[fd], 0x00, sizeof(fildes_t));
return fd;
}
}
/* can't get any free fd */
return -EMFILE;
}
static int sys_write(int fd, const char* buf, size_t len)
{
task_t* curr_task = per_core(current_task);
/* fd is negative or greater than the maximum allowable number */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return -EBADF;
/* fd is not an active, valid file descriptor. */
if (curr_task->fildes_table[fd] == NULL)
return -EBADF;
return write_fs(curr_task->fildes_table[fd], (uint8_t*)buf, len);
}
static int sys_open(const char* name, int flags, int mode)
{
int fd, check;
task_t* curr_task = per_core(current_task);
/* no name is given */
if (name == NULL)
return -EINVAL;
/* Get a free file descriptor */
fd = get_fildes();
/* fd is negative or greater than the maximum allowable number */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return fd; /* in this case fd = errno */
/* init the whole file descriptor structure */
curr_task->fildes_table[fd]->mode = mode;
curr_task->fildes_table[fd]->flags = flags;
curr_task->fildes_table[fd]->count = 1;
check = open_fs(curr_task->fildes_table[fd], (char*) name);
/* file doesn't exist! */
if (check < 0) {
/* tidy up the fildescriptor */
kfree(curr_task->fildes_table[fd], sizeof(fildes_t));
curr_task->fildes_table[fd] = NULL;
return check;
}
return fd;
}
static int sys_stat(const char* name, struct stat* st)
{
vfs_node_t* node;
node = findnode_fs(name);
if (node == NULL)
return -EINVAL;
st->st_dev = 0; /* ID of device containing file */
st->st_ino = 0; /* inode number */
/* convert FS_TYPES in newlib FS_TYPES */
switch (node->type)
{
case FS_FILE: st->st_mode = 0060000; break;
case FS_DIRECTORY: st->st_mode = 0040000; break;
case FS_CHARDEVICE: st->st_mode = 0020000; break;
default: st->st_mode = 0; break;
}
st->st_nlink = 0; /* number of hard links */
st->st_uid = node->uid; /* user ID of owner */
st->st_gid = node->gid; /* group ID of owner */
st->st_rdev = node->type; /* device ID (if special file) */
st->st_size = (node->block_size / MAX_DATAENTRIES + 1) * MAX_DATAENTRIES; /* total size, in bytes */
st->st_blksize = node->block_size; /* blocksize for filesystem I/O */
st->st_blocks = node->block_size / MAX_DATAENTRIES + 1; /* number of blocks allocated */
st->st_atim.tv_sec = 0; /* time of last access */
st->st_atim.tv_nsec = 0;
st->st_mtim.tv_sec = 0; /* time of last modification */
st->st_mtim.tv_nsec = 0;
st->st_ctim.tv_sec = 0; /* time of last status change */
st->st_ctim.tv_nsec = 0;
return 0;
}
static int sys_read(int fd, const char* buf, size_t len)
{
task_t* curr_task = per_core(current_task);
/* fd is negative or greater than the maximum allowable number */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return -EBADF;
/* fd is not an active, valid file descriptor. */
if (curr_task->fildes_table[fd] == NULL)
return -EBADF;
return read_fs(curr_task->fildes_table[fd], (uint8_t*)buf, len);
}
#if defined(CONFIG_LWIP) && LWIP_SOCKET
static int sys_socket(int domain, int type, int protocol)
{
int fd, sock;
task_t* curr_task = per_core(current_task);
/* Get a free file descriptor */
fd = get_fildes();
/* validate the file descriptor */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return fd; /* in this case fd = errno */
/* Get a valid lwip descriptor */
sock = lwip_socket(domain, type, protocol);
/* validate the file descriptor */
if (BUILTIN_EXPECT(sock < 0, 0))
return sock; /* in this case sock = errno */
/*
* init the whole file descriptor structure.
* We use the offset to save the lwip descriptor
* TODO: find another solution or change the name 'offset'
*/
curr_task->fildes_table[fd]->offset = sock;
curr_task->fildes_table[fd]->count = 1;
curr_task->fildes_table[fd]->node = findnode_fs("/dev/socket");
/* file doesn't exist! */
if (curr_task->fildes_table[fd]->node == NULL) {
/* tidy up the fildescriptor */
kfree(curr_task->fildes_table[fd], sizeof(fildes_t));
curr_task->fildes_table[fd] = NULL;
return -ENOENT;
}
return fd;
}
static int sys_accept(int s, struct sockaddr* addr, socklen_t* addrlen)
{
int fd, sock2;
task_t* curr_task = per_core(current_task);
/* validate the 'socket'-filedescriptor */
if (BUILTIN_EXPECT((s >= NR_OPEN) || (s < 0), 0))
return -EBADF;
/* validate the 'socket'-file descriptor object */
if (curr_task->fildes_table[s] == NULL)
return -EBADF;
/* Get a free file descriptor */
fd = get_fildes();
/* validate the file descriptor */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return fd; /* in this case fd = errno */
/* Get a valid lwip descriptor */
sock2 = lwip_accept(s, addr, addrlen);
/* validate the file descriptor */
if (BUILTIN_EXPECT(sock2 < 0, 0))
return sock2; /* in this case sock = errno */
/*
* init the whole file descriptor structure.
* We use the offset to save the lwip descriptor
* TODO: find another solution or change the name 'offset'
*/
curr_task->fildes_table[fd]->offset = sock2;
curr_task->fildes_table[fd]->count = 1;
curr_task->fildes_table[fd]->node = findnode_fs("/dev/socket");
/* file doesn't exist! */
if (curr_task->fildes_table[fd]->node == NULL) {
/* tidy up the fildescriptor */
kfree(curr_task->fildes_table[fd], sizeof(fildes_t));
curr_task->fildes_table[fd] = NULL;
return -ENOENT;
}
return fd;
}
#endif
static int sys_close(int fd)
{
int check;
task_t* curr_task = per_core(current_task);
/* fd is negative or greater than the maximum allowable number */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return -EBADF;
/* fd is not an active, valid file descriptor. */
if (curr_task->fildes_table[fd] == NULL)
return -EBADF;
/*
* The close() call deletes a descriptor from the per-process object
* reference table. If this is the last reference to the underlying
* object, the object will be deactivated.
*/
if (curr_task->fildes_table[fd]->count == 1) {
check = close_fs(curr_task->fildes_table[fd]);
/* close command failed -> return check = errno */
if (BUILTIN_EXPECT(check < 0, 0))
return check;
kfree(curr_task->fildes_table[fd], sizeof(fildes_t));
curr_task->fildes_table[fd] = NULL;
} else {
curr_task->fildes_table[fd]->count--;
curr_task->fildes_table[fd] = NULL;
}
return 0;
}
static int sys_lseek(int fd, off_t pos, int origin)
{
int ret = -EINVAL;
task_t* curr_task = per_core(current_task);
/* fd is negative or greater than the maximum allowable number */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return -EBADF;
/* fd is not an active, valid file descriptor. */
if (curr_task->fildes_table[fd] == NULL)
return -EBADF;
/* TODO: in case of Fildes is associated with a pipe, socket, or FIFO. return ESPIPE */
/* TODO: The seek location is too large to be stored in an object of type off_t. return EOVERFLOW*/
switch(origin)
{
case SEEK_SET: { /* set file offset to offset */
ret = pos;
/* The seek location is negative. */
if (ret < 0)
return -EINVAL;
curr_task->fildes_table[fd]->offset = ret;
ret = 0;
break;
}
case SEEK_CUR: { /* set file offset to current plus offset */
ret = pos + curr_task->fildes_table[fd]->offset;
/* The seek location is negative. */
if (ret < 0)
return -EINVAL;
break;
}
case SEEK_END: { /* set file offset to EOF plus offset */
ret = pos + curr_task->fildes_table[fd]->node->block_size;
/* The seek location is negative. */
if (ret < 0)
return -EINVAL;
curr_task->fildes_table[fd]->offset = ret;
ret = 0;
break;
}
default:
ret = -EINVAL;
break;
}
return ret;
}
static int sys_dup(int fd)
{
task_t* curr_task = per_core(current_task);
int new_fd;
/* fd is negative or greater than the maximum allowable number */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return -EBADF;
/* fd is not an active, valid file descriptor. */
if (curr_task->fildes_table[fd] == NULL)
return -EBADF;
/* Get a free file descriptor */
new_fd = get_fildes();
/* validate the file descriptor */
if (BUILTIN_EXPECT((new_fd >= NR_OPEN) || (fd < 0), 0))
return new_fd; /* in this case fd = errno */
/*
* free the memory which was allocated in get_fildes()
* cause will link it to another existing memory space
*/
kfree(curr_task->fildes_table[new_fd], sizeof(fildes_t));
/* and link it to another existing memory space */
curr_task->fildes_table[new_fd] = curr_task->fildes_table[fd];
curr_task->fildes_table[fd]->count++;
return new_fd;
}
static int sys_dup2(int fd, int fd2)
{
task_t* curr_task = per_core(current_task);
/* fd and fd2 is negative or greater than the maximum allowable number */
if (BUILTIN_EXPECT((fd >= NR_OPEN) || (fd < 0), 0))
return -EBADF;
if (BUILTIN_EXPECT((fd2 >= NR_OPEN) || (fd2 < 0), 0))
return -EBADF;
/* fd is not an active, valid file descriptor. */
if (curr_task->fildes_table[fd] == NULL)
return -EBADF;
/* If fd and fd2 are equal, then dup2() just returns fd2 */
if (fd == fd2)
return fd2;
/*
* if descriptor fd2 is already in use, it is first deallocated
* as if a close(2) call had been done first
*/
if (curr_task->fildes_table[fd2] != NULL)
sys_close(fd2);
curr_task->fildes_table[fd2] = curr_task->fildes_table[fd];
curr_task->fildes_table[fd]->count++;
return fd2;
}
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);
ret = sys_write(fd, 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);
ret = sys_close(fd);
break;
}
case __NR_dup: {
int fd = va_arg(vl, int);
ret = sys_dup(fd);
break;
}
case __NR_dup2: {
int fd = va_arg(vl, int);
int fd2 = va_arg(vl, int);
ret = sys_dup2(fd, fd2);
break;
}
case __NR_stat: {
const char* name = va_arg(vl, const char*);
struct stat* st = va_arg(vl, struct stat*);
ret = sys_stat(name, st);
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);
ret = sys_read(fd, 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);
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;
}