]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/x86/kernel/sys_i386_32.c
2 * This file contains various random system calls that
3 * have a non-standard calling sequence on the Linux/i386
7 #include <linux/errno.h>
8 #include <linux/sched.h>
11 #include <linux/smp.h>
12 #include <linux/sem.h>
13 #include <linux/msg.h>
14 #include <linux/shm.h>
15 #include <linux/stat.h>
16 #include <linux/syscalls.h>
17 #include <linux/mman.h>
18 #include <linux/file.h>
19 #include <linux/utsname.h>
20 #include <linux/ipc.h>
22 #include <linux/uaccess.h>
23 #include <linux/unistd.h>
25 #include <asm/syscalls.h>
27 asmlinkage
long sys_mmap2(unsigned long addr
, unsigned long len
,
28 unsigned long prot
, unsigned long flags
,
29 unsigned long fd
, unsigned long pgoff
)
32 struct file
*file
= NULL
;
33 struct mm_struct
*mm
= current
->mm
;
35 flags
&= ~(MAP_EXECUTABLE
| MAP_DENYWRITE
);
36 if (!(flags
& MAP_ANONYMOUS
)) {
42 down_write(&mm
->mmap_sem
);
43 error
= do_mmap_pgoff(file
, addr
, len
, prot
, flags
, pgoff
);
44 up_write(&mm
->mmap_sem
);
53 * Perform the select(nd, in, out, ex, tv) and mmap() system
54 * calls. Linux/i386 didn't use to be able to handle more than
55 * 4 system call parameters, so these system calls used a memory
56 * block for parameter passing..
59 struct mmap_arg_struct
{
68 asmlinkage
int old_mmap(struct mmap_arg_struct __user
*arg
)
70 struct mmap_arg_struct a
;
73 if (copy_from_user(&a
, arg
, sizeof(a
)))
77 if (a
.offset
& ~PAGE_MASK
)
80 err
= sys_mmap2(a
.addr
, a
.len
, a
.prot
, a
.flags
,
81 a
.fd
, a
.offset
>> PAGE_SHIFT
);
87 struct sel_arg_struct
{
89 fd_set __user
*inp
, *outp
, *exp
;
90 struct timeval __user
*tvp
;
93 asmlinkage
int old_select(struct sel_arg_struct __user
*arg
)
95 struct sel_arg_struct a
;
97 if (copy_from_user(&a
, arg
, sizeof(a
)))
99 /* sys_select() does the appropriate kernel locking */
100 return sys_select(a
.n
, a
.inp
, a
.outp
, a
.exp
, a
.tvp
);
104 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
106 * This is really horribly ugly.
108 asmlinkage
int sys_ipc(uint call
, int first
, int second
,
109 int third
, void __user
*ptr
, long fifth
)
113 version
= call
>> 16; /* hack for backward compatibility */
118 return sys_semtimedop(first
, (struct sembuf __user
*)ptr
, second
, NULL
);
120 return sys_semtimedop(first
, (struct sembuf __user
*)ptr
, second
,
121 (const struct timespec __user
*)fifth
);
124 return sys_semget(first
, second
, third
);
129 if (get_user(fourth
.__pad
, (void __user
* __user
*) ptr
))
131 return sys_semctl(first
, second
, third
, fourth
);
135 return sys_msgsnd(first
, (struct msgbuf __user
*) ptr
,
140 struct ipc_kludge tmp
;
144 if (copy_from_user(&tmp
,
145 (struct ipc_kludge __user
*) ptr
,
148 return sys_msgrcv(first
, tmp
.msgp
, second
,
152 return sys_msgrcv(first
,
153 (struct msgbuf __user
*) ptr
,
154 second
, fifth
, third
);
157 return sys_msgget((key_t
) first
, second
);
159 return sys_msgctl(first
, second
, (struct msqid_ds __user
*) ptr
);
165 ret
= do_shmat(first
, (char __user
*) ptr
, second
, &raddr
);
168 return put_user(raddr
, (ulong __user
*) third
);
170 case 1: /* iBCS2 emulator entry point */
171 if (!segment_eq(get_fs(), get_ds()))
173 /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
174 return do_shmat(first
, (char __user
*) ptr
, second
, (ulong
*) third
);
177 return sys_shmdt((char __user
*)ptr
);
179 return sys_shmget(first
, second
, third
);
181 return sys_shmctl(first
, second
,
182 (struct shmid_ds __user
*) ptr
);
191 asmlinkage
int sys_uname(struct old_utsname __user
*name
)
197 err
= copy_to_user(name
, utsname(), sizeof(*name
));
199 return err
? -EFAULT
:0;
202 asmlinkage
int sys_olduname(struct oldold_utsname __user
*name
)
208 if (!access_ok(VERIFY_WRITE
, name
, sizeof(struct oldold_utsname
)))
213 error
= __copy_to_user(&name
->sysname
, &utsname()->sysname
,
215 error
|= __put_user(0, name
->sysname
+ __OLD_UTS_LEN
);
216 error
|= __copy_to_user(&name
->nodename
, &utsname()->nodename
,
218 error
|= __put_user(0, name
->nodename
+ __OLD_UTS_LEN
);
219 error
|= __copy_to_user(&name
->release
, &utsname()->release
,
221 error
|= __put_user(0, name
->release
+ __OLD_UTS_LEN
);
222 error
|= __copy_to_user(&name
->version
, &utsname()->version
,
224 error
|= __put_user(0, name
->version
+ __OLD_UTS_LEN
);
225 error
|= __copy_to_user(&name
->machine
, &utsname()->machine
,
227 error
|= __put_user(0, name
->machine
+ __OLD_UTS_LEN
);
231 error
= error
? -EFAULT
: 0;
238 * Do a system call from kernel instead of calling sys_execve so we
239 * end up with proper pt_regs.
241 int kernel_execve(const char *filename
, char *const argv
[], char *const envp
[])
244 asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
246 : "0" (__NR_execve
), "ri" (filename
), "c" (argv
), "d" (envp
) : "memory");