1 /*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2000
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
5 * Thomas Spatzier (tspat@de.ibm.com)
6 *
7 * Derived from "arch/i386/kernel/sys_i386.c"
8 *
9 * This file contains various random system calls that
10 * have a non-standard calling sequence on the Linux/s390
11 * platform.
12 */
13
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/mm.h>
17 #include <linux/fs.h>
18 #include <linux/smp.h>
19 #include <linux/sem.h>
20 #include <linux/msg.h>
21 #include <linux/shm.h>
22 #include <linux/stat.h>
23 #include <linux/syscalls.h>
24 #include <linux/mman.h>
25 #include <linux/file.h>
26 #include <linux/utsname.h>
27 #include <linux/personality.h>
28 #include <linux/unistd.h>
29 #include <linux/ipc.h>
30 #include <asm/uaccess.h>
31 #include "entry.h"
32
33 /*
34 * Perform the mmap() system call. Linux for S/390 isn't able to handle more
35 * than 5 system call parameters, so this system call uses a memory block
36 * for parameter passing.
37 */
38
39 struct s390_mmap_arg_struct {
40 unsigned long addr;
41 unsigned long len;
42 unsigned long prot;
43 unsigned long flags;
44 unsigned long fd;
45 unsigned long offset;
46 };
47
SYSCALL_DEFINE1(mmap2,struct s390_mmap_arg_struct __user *,arg)48 SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
49 {
50 struct s390_mmap_arg_struct a;
51 int error = -EFAULT;
52
53 if (copy_from_user(&a, arg, sizeof(a)))
54 goto out;
55 error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
56 out:
57 return error;
58 }
59
60 /*
61 * sys_ipc() is the de-multiplexer for the SysV IPC calls.
62 */
SYSCALL_DEFINE5(s390_ipc,uint,call,int,first,unsigned long,second,unsigned long,third,void __user *,ptr)63 SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
64 unsigned long, third, void __user *, ptr)
65 {
66 if (call >> 16)
67 return -EINVAL;
68 /* The s390 sys_ipc variant has only five parameters instead of six
69 * like the generic variant. The only difference is the handling of
70 * the SEMTIMEDOP subcall where on s390 the third parameter is used
71 * as a pointer to a struct timespec where the generic variant uses
72 * the fifth parameter.
73 * Therefore we can call the generic variant by simply passing the
74 * third parameter also as fifth parameter.
75 */
76 return sys_ipc(call, first, second, third, ptr, third);
77 }
78
SYSCALL_DEFINE1(s390_personality,unsigned int,personality)79 SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
80 {
81 unsigned int ret;
82
83 if (personality(current->personality) == PER_LINUX32 &&
84 personality(personality) == PER_LINUX)
85 personality |= PER_LINUX32;
86 ret = sys_personality(personality);
87 if (personality(ret) == PER_LINUX32)
88 ret &= ~PER_LINUX32;
89
90 return ret;
91 }
92