264 lines
6.1 KiB
C
264 lines
6.1 KiB
C
/*
|
|
* This file contains various random system calls that
|
|
* have a non-standard calling sequence on the Linux/i386
|
|
* platform.
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/sem.h>
|
|
#include <linux/msg.h>
|
|
#include <linux/shm.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/file.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/ipc.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/unistd.h>
|
|
|
|
/*
|
|
* 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 __user * fildes)
|
|
{
|
|
int fd[2];
|
|
int error;
|
|
|
|
error = do_pipe(fd);
|
|
if (!error) {
|
|
if (copy_to_user(fildes, fd, 2*sizeof(int)))
|
|
error = -EFAULT;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
|
|
unsigned long prot, unsigned long flags,
|
|
unsigned long fd, unsigned long pgoff)
|
|
{
|
|
int error = -EBADF;
|
|
struct file *file = NULL;
|
|
struct mm_struct *mm = current->mm;
|
|
|
|
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
|
|
if (!(flags & MAP_ANONYMOUS)) {
|
|
file = fget(fd);
|
|
if (!file)
|
|
goto out;
|
|
}
|
|
|
|
down_write(&mm->mmap_sem);
|
|
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
|
|
up_write(&mm->mmap_sem);
|
|
|
|
if (file)
|
|
fput(file);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Perform the select(nd, in, out, ex, tv) and mmap() system
|
|
* calls. Linux/i386 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 __user *arg)
|
|
{
|
|
struct mmap_arg_struct a;
|
|
int err = -EFAULT;
|
|
|
|
if (copy_from_user(&a, arg, sizeof(a)))
|
|
goto out;
|
|
|
|
err = -EINVAL;
|
|
if (a.offset & ~PAGE_MASK)
|
|
goto out;
|
|
|
|
err = sys_mmap2(a.addr, a.len, a.prot, a.flags,
|
|
a.fd, a.offset >> PAGE_SHIFT);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
|
|
struct sel_arg_struct {
|
|
unsigned long n;
|
|
fd_set __user *inp, *outp, *exp;
|
|
struct timeval __user *tvp;
|
|
};
|
|
|
|
asmlinkage int old_select(struct sel_arg_struct __user *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 __user *ptr, long fifth)
|
|
{
|
|
int version, ret;
|
|
|
|
version = call >> 16; /* hack for backward compatibility */
|
|
call &= 0xffff;
|
|
|
|
switch (call) {
|
|
case SEMOP:
|
|
return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
|
|
case SEMTIMEDOP:
|
|
return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
|
|
(const struct timespec __user *)fifth);
|
|
|
|
case SEMGET:
|
|
return sys_semget (first, second, third);
|
|
case SEMCTL: {
|
|
union semun fourth;
|
|
if (!ptr)
|
|
return -EINVAL;
|
|
if (get_user(fourth.__pad, (void __user * __user *) ptr))
|
|
return -EFAULT;
|
|
return sys_semctl (first, second, third, fourth);
|
|
}
|
|
|
|
case MSGSND:
|
|
return sys_msgsnd (first, (struct msgbuf __user *) ptr,
|
|
second, third);
|
|
case MSGRCV:
|
|
switch (version) {
|
|
case 0: {
|
|
struct ipc_kludge tmp;
|
|
if (!ptr)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&tmp,
|
|
(struct ipc_kludge __user *) ptr,
|
|
sizeof (tmp)))
|
|
return -EFAULT;
|
|
return sys_msgrcv (first, tmp.msgp, second,
|
|
tmp.msgtyp, third);
|
|
}
|
|
default:
|
|
return sys_msgrcv (first,
|
|
(struct msgbuf __user *) ptr,
|
|
second, fifth, third);
|
|
}
|
|
case MSGGET:
|
|
return sys_msgget ((key_t) first, second);
|
|
case MSGCTL:
|
|
return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
|
|
|
|
case SHMAT:
|
|
switch (version) {
|
|
default: {
|
|
ulong raddr;
|
|
ret = do_shmat (first, (char __user *) ptr, second, &raddr);
|
|
if (ret)
|
|
return ret;
|
|
return put_user (raddr, (ulong __user *) third);
|
|
}
|
|
case 1: /* iBCS2 emulator entry point */
|
|
if (!segment_eq(get_fs(), get_ds()))
|
|
return -EINVAL;
|
|
/* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
|
|
return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
|
|
}
|
|
case SHMDT:
|
|
return sys_shmdt ((char __user *)ptr);
|
|
case SHMGET:
|
|
return sys_shmget (first, second, third);
|
|
case SHMCTL:
|
|
return sys_shmctl (first, second,
|
|
(struct shmid_ds __user *) ptr);
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Old cruft
|
|
*/
|
|
asmlinkage int sys_uname(struct old_utsname __user * name)
|
|
{
|
|
int err;
|
|
if (!name)
|
|
return -EFAULT;
|
|
down_read(&uts_sem);
|
|
err = copy_to_user(name, utsname(), sizeof (*name));
|
|
up_read(&uts_sem);
|
|
return err?-EFAULT:0;
|
|
}
|
|
|
|
asmlinkage int sys_olduname(struct oldold_utsname __user * name)
|
|
{
|
|
int error;
|
|
|
|
if (!name)
|
|
return -EFAULT;
|
|
if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
|
|
return -EFAULT;
|
|
|
|
down_read(&uts_sem);
|
|
|
|
error = __copy_to_user(&name->sysname, &utsname()->sysname,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->nodename, &utsname()->nodename,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->release, &utsname()->release,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->release + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->version, &utsname()->version,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->version + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->machine, &utsname()->machine,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->machine + __OLD_UTS_LEN);
|
|
|
|
up_read(&uts_sem);
|
|
|
|
error = error ? -EFAULT : 0;
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* Do a system call from kernel instead of calling sys_execve so we
|
|
* end up with proper pt_regs.
|
|
*/
|
|
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
|
|
{
|
|
long __res;
|
|
asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
|
|
: "=a" (__res)
|
|
: "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory");
|
|
return __res;
|
|
}
|