2 * linux/arch/i386/kernel/sys_i386.c
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/i386
9 #include <linux/errno.h>
10 #include <linux/sched.h>
12 #include <linux/smp.h>
13 #include <linux/smp_lock.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/syscalls.h>
19 #include <linux/mman.h>
20 #include <linux/file.h>
21 #include <linux/utsname.h>
23 #include <asm/uaccess.h>
27 * sys_pipe() is the normal C calling standard for creating
28 * a pipe. It's not the way Unix traditionally does this, though.
30 asmlinkage
int sys_pipe(unsigned long __user
* fildes
)
37 if (copy_to_user(fildes
, fd
, 2*sizeof(int)))
43 asmlinkage
long sys_mmap2(unsigned long addr
, unsigned long len
,
44 unsigned long prot
, unsigned long flags
,
45 unsigned long fd
, unsigned long pgoff
)
48 struct file
*file
= NULL
;
49 struct mm_struct
*mm
= current
->mm
;
51 flags
&= ~(MAP_EXECUTABLE
| MAP_DENYWRITE
);
52 if (!(flags
& MAP_ANONYMOUS
)) {
58 down_write(&mm
->mmap_sem
);
59 error
= do_mmap_pgoff(file
, addr
, len
, prot
, flags
, pgoff
);
60 up_write(&mm
->mmap_sem
);
69 * Perform the select(nd, in, out, ex, tv) and mmap() system
70 * calls. Linux/i386 didn't use to be able to handle more than
71 * 4 system call parameters, so these system calls used a memory
72 * block for parameter passing..
75 struct mmap_arg_struct
{
84 asmlinkage
int old_mmap(struct mmap_arg_struct __user
*arg
)
86 struct mmap_arg_struct a
;
89 if (copy_from_user(&a
, arg
, sizeof(a
)))
93 if (a
.offset
& ~PAGE_MASK
)
96 err
= sys_mmap2(a
.addr
, a
.len
, a
.prot
, a
.flags
,
97 a
.fd
, a
.offset
>> PAGE_SHIFT
);
103 struct sel_arg_struct
{
105 fd_set __user
*inp
, *outp
, *exp
;
106 struct timeval __user
*tvp
;
109 asmlinkage
int old_select(struct sel_arg_struct __user
*arg
)
111 struct sel_arg_struct a
;
113 if (copy_from_user(&a
, arg
, sizeof(a
)))
115 /* sys_select() does the appropriate kernel locking */
116 return sys_select(a
.n
, a
.inp
, a
.outp
, a
.exp
, a
.tvp
);
120 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
122 * This is really horribly ugly.
124 asmlinkage
int sys_ipc (uint call
, int first
, int second
,
125 int third
, void __user
*ptr
, long fifth
)
129 version
= call
>> 16; /* hack for backward compatibility */
134 return sys_semtimedop (first
, (struct sembuf __user
*)ptr
, second
, NULL
);
136 return sys_semtimedop(first
, (struct sembuf __user
*)ptr
, second
,
137 (const struct timespec __user
*)fifth
);
140 return sys_semget (first
, second
, third
);
145 if (get_user(fourth
.__pad
, (void __user
* __user
*) ptr
))
147 return sys_semctl (first
, second
, third
, fourth
);
151 return sys_msgsnd (first
, (struct msgbuf __user
*) ptr
,
156 struct ipc_kludge tmp
;
160 if (copy_from_user(&tmp
,
161 (struct ipc_kludge __user
*) ptr
,
164 return sys_msgrcv (first
, tmp
.msgp
, second
,
168 return sys_msgrcv (first
,
169 (struct msgbuf __user
*) ptr
,
170 second
, fifth
, third
);
173 return sys_msgget ((key_t
) first
, second
);
175 return sys_msgctl (first
, second
, (struct msqid_ds __user
*) ptr
);
181 ret
= do_shmat (first
, (char __user
*) ptr
, second
, &raddr
);
184 return put_user (raddr
, (ulong __user
*) third
);
186 case 1: /* iBCS2 emulator entry point */
187 if (!segment_eq(get_fs(), get_ds()))
189 /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
190 return do_shmat (first
, (char __user
*) ptr
, second
, (ulong
*) third
);
193 return sys_shmdt ((char __user
*)ptr
);
195 return sys_shmget (first
, second
, third
);
197 return sys_shmctl (first
, second
,
198 (struct shmid_ds __user
*) ptr
);
207 asmlinkage
int sys_uname(struct old_utsname __user
* name
)
213 err
=copy_to_user(name
, &system_utsname
, sizeof (*name
));
215 return err
?-EFAULT
:0;
218 asmlinkage
int sys_olduname(struct oldold_utsname __user
* name
)
224 if (!access_ok(VERIFY_WRITE
,name
,sizeof(struct oldold_utsname
)))
229 error
= __copy_to_user(&name
->sysname
,&system_utsname
.sysname
,__OLD_UTS_LEN
);
230 error
|= __put_user(0,name
->sysname
+__OLD_UTS_LEN
);
231 error
|= __copy_to_user(&name
->nodename
,&system_utsname
.nodename
,__OLD_UTS_LEN
);
232 error
|= __put_user(0,name
->nodename
+__OLD_UTS_LEN
);
233 error
|= __copy_to_user(&name
->release
,&system_utsname
.release
,__OLD_UTS_LEN
);
234 error
|= __put_user(0,name
->release
+__OLD_UTS_LEN
);
235 error
|= __copy_to_user(&name
->version
,&system_utsname
.version
,__OLD_UTS_LEN
);
236 error
|= __put_user(0,name
->version
+__OLD_UTS_LEN
);
237 error
|= __copy_to_user(&name
->machine
,&system_utsname
.machine
,__OLD_UTS_LEN
);
238 error
|= __put_user(0,name
->machine
+__OLD_UTS_LEN
);
242 error
= error
? -EFAULT
: 0;
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