]>
git.proxmox.com Git - mirror_ubuntu-jammy-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>
21 #include <asm/uaccess.h>
22 #include <asm/unistd.h>
26 * sys_pipe() is the normal C calling standard for creating
27 * a pipe. It's not the way Unix traditionally does this, though.
29 asmlinkage
int sys_pipe(unsigned long __user
* fildes
)
36 if (copy_to_user(fildes
, fd
, 2*sizeof(int)))
42 asmlinkage
long sys_mmap2(unsigned long addr
, unsigned long len
,
43 unsigned long prot
, unsigned long flags
,
44 unsigned long fd
, unsigned long pgoff
)
47 struct file
*file
= NULL
;
48 struct mm_struct
*mm
= current
->mm
;
50 flags
&= ~(MAP_EXECUTABLE
| MAP_DENYWRITE
);
51 if (!(flags
& MAP_ANONYMOUS
)) {
57 down_write(&mm
->mmap_sem
);
58 error
= do_mmap_pgoff(file
, addr
, len
, prot
, flags
, pgoff
);
59 up_write(&mm
->mmap_sem
);
68 * Perform the select(nd, in, out, ex, tv) and mmap() system
69 * calls. Linux/i386 didn't use to be able to handle more than
70 * 4 system call parameters, so these system calls used a memory
71 * block for parameter passing..
74 struct mmap_arg_struct
{
83 asmlinkage
int old_mmap(struct mmap_arg_struct __user
*arg
)
85 struct mmap_arg_struct a
;
88 if (copy_from_user(&a
, arg
, sizeof(a
)))
92 if (a
.offset
& ~PAGE_MASK
)
95 err
= sys_mmap2(a
.addr
, a
.len
, a
.prot
, a
.flags
,
96 a
.fd
, a
.offset
>> PAGE_SHIFT
);
102 struct sel_arg_struct
{
104 fd_set __user
*inp
, *outp
, *exp
;
105 struct timeval __user
*tvp
;
108 asmlinkage
int old_select(struct sel_arg_struct __user
*arg
)
110 struct sel_arg_struct a
;
112 if (copy_from_user(&a
, arg
, sizeof(a
)))
114 /* sys_select() does the appropriate kernel locking */
115 return sys_select(a
.n
, a
.inp
, a
.outp
, a
.exp
, a
.tvp
);
119 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
121 * This is really horribly ugly.
123 asmlinkage
int sys_ipc (uint call
, int first
, int second
,
124 int third
, void __user
*ptr
, long fifth
)
128 version
= call
>> 16; /* hack for backward compatibility */
133 return sys_semtimedop (first
, (struct sembuf __user
*)ptr
, second
, NULL
);
135 return sys_semtimedop(first
, (struct sembuf __user
*)ptr
, second
,
136 (const struct timespec __user
*)fifth
);
139 return sys_semget (first
, second
, third
);
144 if (get_user(fourth
.__pad
, (void __user
* __user
*) ptr
))
146 return sys_semctl (first
, second
, third
, fourth
);
150 return sys_msgsnd (first
, (struct msgbuf __user
*) ptr
,
155 struct ipc_kludge tmp
;
159 if (copy_from_user(&tmp
,
160 (struct ipc_kludge __user
*) ptr
,
163 return sys_msgrcv (first
, tmp
.msgp
, second
,
167 return sys_msgrcv (first
,
168 (struct msgbuf __user
*) ptr
,
169 second
, fifth
, third
);
172 return sys_msgget ((key_t
) first
, second
);
174 return sys_msgctl (first
, second
, (struct msqid_ds __user
*) ptr
);
180 ret
= do_shmat (first
, (char __user
*) ptr
, second
, &raddr
);
183 return put_user (raddr
, (ulong __user
*) third
);
185 case 1: /* iBCS2 emulator entry point */
186 if (!segment_eq(get_fs(), get_ds()))
188 /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
189 return do_shmat (first
, (char __user
*) ptr
, second
, (ulong
*) third
);
192 return sys_shmdt ((char __user
*)ptr
);
194 return sys_shmget (first
, second
, third
);
196 return sys_shmctl (first
, second
,
197 (struct shmid_ds __user
*) ptr
);
206 asmlinkage
int sys_uname(struct old_utsname __user
* name
)
212 err
= copy_to_user(name
, utsname(), sizeof (*name
));
214 return err
?-EFAULT
:0;
217 asmlinkage
int sys_olduname(struct oldold_utsname __user
* name
)
223 if (!access_ok(VERIFY_WRITE
,name
,sizeof(struct oldold_utsname
)))
228 error
= __copy_to_user(&name
->sysname
, &utsname()->sysname
,
230 error
|= __put_user(0, name
->sysname
+ __OLD_UTS_LEN
);
231 error
|= __copy_to_user(&name
->nodename
, &utsname()->nodename
,
233 error
|= __put_user(0, name
->nodename
+ __OLD_UTS_LEN
);
234 error
|= __copy_to_user(&name
->release
, &utsname()->release
,
236 error
|= __put_user(0, name
->release
+ __OLD_UTS_LEN
);
237 error
|= __copy_to_user(&name
->version
, &utsname()->version
,
239 error
|= __put_user(0, name
->version
+ __OLD_UTS_LEN
);
240 error
|= __copy_to_user(&name
->machine
, &utsname()->machine
,
242 error
|= __put_user(0, name
->machine
+ __OLD_UTS_LEN
);
246 error
= error
? -EFAULT
: 0;
253 * Do a system call from kernel instead of calling sys_execve so we
254 * end up with proper pt_regs.
256 int kernel_execve(const char *filename
, char *const argv
[], char *const envp
[])
259 asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
261 : "0" (__NR_execve
),"ri" (filename
),"c" (argv
), "d" (envp
) : "memory");