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* linux/arch/arm/kernel/sys_arm.c
*
* Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
* Copyright (C) 1995, 1996 Russell King.
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/arm
* platform.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <asm/uaccess.h>
#include <asm/ipc.h>
/*
* Constant strings used in inlined functions in header files
*/
/* proc/system.h */
const char xchg_str[] = "xchg";
/*
* sys_pipe() is the normal C calling standard for creating
* a pipe. It's not the way unix traditionally does this, though.
*/
asmlinkage int sys_pipe(unsigned long * fildes)
{
int fd[2];
int error;
lock_kernel();
error = do_pipe(fd);
unlock_kernel();
if (!error) {
if (copy_to_user(fildes, fd, 2*sizeof(int)))
error = -EFAULT;
}
return error;
}
/*
* Perform the select(nd, in, out, ex, tv) and mmap() system
* calls. ARM Linux didn't use to be able to handle more than
* 4 system call parameters, so these system calls used a memory
* block for parameter passing..
*/
struct mmap_arg_struct {
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};
asmlinkage int old_mmap(struct mmap_arg_struct *arg)
{
int error = -EFAULT;
struct file * file = NULL;
struct mmap_arg_struct a;
lock_kernel();
if (copy_from_user(&a, arg, sizeof(a)))
goto out;
if (!(a.flags & MAP_ANONYMOUS)) {
error = -EBADF;
file = fget(a.fd);
if (!file)
goto out;
}
a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
error = do_mmap(file, a.addr, a.len, a.prot, a.flags, a.offset);
if (file)
fput(file);
out:
unlock_kernel();
return error;
}
extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
struct sel_arg_struct {
unsigned long n;
fd_set *inp, *outp, *exp;
struct timeval *tvp;
};
asmlinkage int old_select(struct sel_arg_struct *arg)
{
struct sel_arg_struct a;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
/* sys_select() does the appropriate kernel locking */
return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
}
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
{
int version, ret;
lock_kernel();
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
if (call <= SEMCTL)
switch (call) {
case SEMOP:
ret = sys_semop (first, (struct sembuf *)ptr, second);
goto out;
case SEMGET:
ret = sys_semget (first, second, third);
goto out;
case SEMCTL: {
union semun fourth;
ret = -EINVAL;
if (!ptr)
goto out;
ret = -EFAULT;
if (get_user(fourth.__pad, (void **) ptr))
goto out;
ret = sys_semctl (first, second, third, fourth);
goto out;
}
default:
ret = -EINVAL;
goto out;
}
if (call <= MSGCTL)
switch (call) {
case MSGSND:
ret = sys_msgsnd (first, (struct msgbuf *) ptr,
second, third);
goto out;
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
ret = -EINVAL;
if (!ptr)
goto out;
ret = -EFAULT;
if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
sizeof (tmp)))
goto out;
ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
goto out;
}
case 1: default:
ret = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
goto out;
}
case MSGGET:
ret = sys_msgget ((key_t) first, second);
goto out;
case MSGCTL:
ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
goto out;
default:
ret = -EINVAL;
goto out;
}
if (call <= SHMCTL)
switch (call) {
case SHMAT:
switch (version) {
case 0: default: {
ulong raddr;
ret = sys_shmat (first, (char *) ptr, second, &raddr);
if (ret)
goto out;
ret = put_user (raddr, (ulong *) third);
goto out;
}
case 1: /* iBCS2 emulator entry point */
ret = -EINVAL;
if (!segment_eq(get_fs(), get_ds()))
goto out;
ret = sys_shmat (first, (char *) ptr, second, (ulong *) third);
goto out;
}
case SHMDT:
ret = sys_shmdt ((char *)ptr);
goto out;
case SHMGET:
ret = sys_shmget (first, second, third);
goto out;
case SHMCTL:
ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
goto out;
default:
ret = -EINVAL;
goto out;
}
else
ret = -EINVAL;
out:
unlock_kernel();
return ret;
}
/* Fork a new task - this creates a new program thread.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_fork(struct pt_regs *regs)
{
int ret;
lock_kernel();
ret = do_fork(SIGCHLD, regs->ARM_sp, regs);
unlock_kernel();
return ret;
}
/* Clone a task - this clones the calling program thread.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
{
int ret;
lock_kernel();
if (!newsp)
newsp = regs->ARM_sp;
ret = do_fork(clone_flags, newsp, regs);
unlock_kernel();
return ret;
}
/* sys_execve() executes a new program.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_execve(char *filenamei, char **argv, char **envp, struct pt_regs *regs)
{
int error;
char * filename;
lock_kernel();
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
putname(filename);
out:
unlock_kernel();
return error;
}
/*
* Detect the old function calling standard
*/
static inline unsigned long old_calling_standard (struct pt_regs *regs)
{
unsigned long instr, *pcv = (unsigned long *)(instruction_pointer(regs) - 8);
return (!get_user (instr, pcv) && instr == 0xe1a0300d);
}
/* Compatability functions - we used to pass 5 parameters as r0, r1, r2, *r3, *(r3+4)
* We now use r0 - r4, and return an error if the old style calling standard is used.
* Eventually these functions will disappear.
*/
asmlinkage int
sys_compat_llseek (unsigned int fd, unsigned long offset_high, unsigned long offset_low,
loff_t *result, unsigned int origin, struct pt_regs *regs)
{
extern int sys_llseek (unsigned int, unsigned long, unsigned long, loff_t *, unsigned int);
if (old_calling_standard (regs)) {
printk (KERN_NOTICE "%s (%d): unsupported llseek call standard\n",
current->comm, current->pid);
return -EINVAL;
}
return sys_llseek (fd, offset_high, offset_low, result, origin);
}
asmlinkage int
sys_compat_mount (char *devname, char *dirname, char *type, unsigned long flags, void *data,
struct pt_regs *regs)
{
extern int sys_mount (char *, char *, char *, unsigned long, void *);
if (old_calling_standard (regs)) {
printk (KERN_NOTICE "%s (%d): unsupported mount call standard\n",
current->comm, current->pid);
return -EINVAL;
}
return sys_mount (devname, dirname, type, flags, data);
}
asmlinkage int sys_uname (struct old_utsname * name)
{
static int warned = 0;
int err;
if (warned == 0) {
warned ++;
printk (KERN_NOTICE "%s (%d): obsolete uname call\n",
current->comm, current->pid);
}
if(!name)
return -EFAULT;
down(&uts_sem);
err=copy_to_user (name, &system_utsname, sizeof (*name));
up(&uts_sem);
return err?-EFAULT:0;
}
asmlinkage int sys_olduname(struct oldold_utsname * name)
{
int error;
static int warned = 0;
if (warned == 0) {
warned ++;
printk (KERN_NOTICE "%s (%d): obsolete olduname call\n",
current->comm, current->pid);
}
if (!name)
return -EFAULT;
if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
return -EFAULT;
down(&uts_sem);
error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
error -= __put_user(0,name->release+__OLD_UTS_LEN);
error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
error -= __put_user(0,name->version+__OLD_UTS_LEN);
error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
error -= __put_user(0,name->machine+__OLD_UTS_LEN);
up(&uts_sem);
error = error ? -EFAULT : 0;
return error;
}
asmlinkage int sys_pause(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule();
return -ERESTARTNOHAND;
}
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