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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2000
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
6 * Thomas Spatzier (tspat@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/sys_i386.c"
9 *
10 * This file contains various random system calls that
11 * have a non-standard calling sequence on the Linux/s390
12 * platform.
13 */
14
15#include <linux/errno.h>
16#include <linux/sched.h>
17#include <linux/mm.h>
18#include <linux/fs.h>
19#include <linux/smp.h>
20#include <linux/sem.h>
21#include <linux/msg.h>
22#include <linux/shm.h>
23#include <linux/stat.h>
24#include <linux/syscalls.h>
25#include <linux/mman.h>
26#include <linux/file.h>
27#include <linux/utsname.h>
28#include <linux/personality.h>
29#include <linux/unistd.h>
30#include <linux/ipc.h>
31#include <linux/uaccess.h>
32#include "entry.h"
33
34/*
35 * Perform the mmap() system call. Linux for S/390 isn't able to handle more
36 * than 5 system call parameters, so this system call uses a memory block
37 * for parameter passing.
38 */
39
40struct s390_mmap_arg_struct {
41 unsigned long addr;
42 unsigned long len;
43 unsigned long prot;
44 unsigned long flags;
45 unsigned long fd;
46 unsigned long offset;
47};
48
49SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
50{
51 struct s390_mmap_arg_struct a;
52 int error = -EFAULT;
53
54 if (copy_from_user(&a, arg, sizeof(a)))
55 goto out;
56 error = ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
57out:
58 return error;
59}
60
61#ifdef CONFIG_SYSVIPC
62/*
63 * sys_ipc() is the de-multiplexer for the SysV IPC calls.
64 */
65SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
66 unsigned long, third, void __user *, ptr)
67{
68 if (call >> 16)
69 return -EINVAL;
70 /* The s390 sys_ipc variant has only five parameters instead of six
71 * like the generic variant. The only difference is the handling of
72 * the SEMTIMEDOP subcall where on s390 the third parameter is used
73 * as a pointer to a struct timespec where the generic variant uses
74 * the fifth parameter.
75 * Therefore we can call the generic variant by simply passing the
76 * third parameter also as fifth parameter.
77 */
78 return ksys_ipc(call, first, second, third, ptr, third);
79}
80#endif /* CONFIG_SYSVIPC */
81
82SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
83{
84 unsigned int ret = current->personality;
85
86 if (personality(current->personality) == PER_LINUX32 &&
87 personality(personality) == PER_LINUX)
88 personality |= PER_LINUX32;
89
90 if (personality != 0xffffffff)
91 set_personality(personality);
92
93 if (personality(ret) == PER_LINUX32)
94 ret &= ~PER_LINUX32;
95
96 return ret;
97}
98
99SYSCALL_DEFINE0(ni_syscall)
100{
101 return -ENOSYS;
102}
1/*
2 * arch/s390/kernel/sys_s390.c
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7 * Thomas Spatzier (tspat@de.ibm.com)
8 *
9 * Derived from "arch/i386/kernel/sys_i386.c"
10 *
11 * This file contains various random system calls that
12 * have a non-standard calling sequence on the Linux/s390
13 * platform.
14 */
15
16#include <linux/errno.h>
17#include <linux/sched.h>
18#include <linux/mm.h>
19#include <linux/fs.h>
20#include <linux/smp.h>
21#include <linux/sem.h>
22#include <linux/msg.h>
23#include <linux/shm.h>
24#include <linux/stat.h>
25#include <linux/syscalls.h>
26#include <linux/mman.h>
27#include <linux/file.h>
28#include <linux/utsname.h>
29#include <linux/personality.h>
30#include <linux/unistd.h>
31#include <linux/ipc.h>
32#include <asm/uaccess.h>
33#include "entry.h"
34
35/*
36 * Perform the mmap() system call. Linux for S/390 isn't able to handle more
37 * than 5 system call parameters, so this system call uses a memory block
38 * for parameter passing.
39 */
40
41struct s390_mmap_arg_struct {
42 unsigned long addr;
43 unsigned long len;
44 unsigned long prot;
45 unsigned long flags;
46 unsigned long fd;
47 unsigned long offset;
48};
49
50SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
51{
52 struct s390_mmap_arg_struct a;
53 int error = -EFAULT;
54
55 if (copy_from_user(&a, arg, sizeof(a)))
56 goto out;
57 error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
58out:
59 return error;
60}
61
62/*
63 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
64 *
65 * This is really horribly ugly.
66 */
67SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
68 unsigned long, third, void __user *, ptr)
69{
70 struct ipc_kludge tmp;
71 int ret;
72
73 switch (call) {
74 case SEMOP:
75 return sys_semtimedop(first, (struct sembuf __user *)ptr,
76 (unsigned)second, NULL);
77 case SEMTIMEDOP:
78 return sys_semtimedop(first, (struct sembuf __user *)ptr,
79 (unsigned)second,
80 (const struct timespec __user *) third);
81 case SEMGET:
82 return sys_semget(first, (int)second, third);
83 case SEMCTL: {
84 union semun fourth;
85 if (!ptr)
86 return -EINVAL;
87 if (get_user(fourth.__pad, (void __user * __user *) ptr))
88 return -EFAULT;
89 return sys_semctl(first, (int)second, third, fourth);
90 }
91 case MSGSND:
92 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
93 (size_t)second, third);
94 break;
95 case MSGRCV:
96 if (!ptr)
97 return -EINVAL;
98 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
99 sizeof (struct ipc_kludge)))
100 return -EFAULT;
101 return sys_msgrcv (first, tmp.msgp,
102 (size_t)second, tmp.msgtyp, third);
103 case MSGGET:
104 return sys_msgget((key_t)first, (int)second);
105 case MSGCTL:
106 return sys_msgctl(first, (int)second,
107 (struct msqid_ds __user *)ptr);
108
109 case SHMAT: {
110 ulong raddr;
111 ret = do_shmat(first, (char __user *)ptr,
112 (int)second, &raddr);
113 if (ret)
114 return ret;
115 return put_user (raddr, (ulong __user *) third);
116 break;
117 }
118 case SHMDT:
119 return sys_shmdt ((char __user *)ptr);
120 case SHMGET:
121 return sys_shmget(first, (size_t)second, third);
122 case SHMCTL:
123 return sys_shmctl(first, (int)second,
124 (struct shmid_ds __user *) ptr);
125 default:
126 return -ENOSYS;
127
128 }
129
130 return -EINVAL;
131}
132
133#ifdef CONFIG_64BIT
134SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
135{
136 unsigned int ret;
137
138 if (current->personality == PER_LINUX32 && personality == PER_LINUX)
139 personality = PER_LINUX32;
140 ret = sys_personality(personality);
141 if (ret == PER_LINUX32)
142 ret = PER_LINUX;
143
144 return ret;
145}
146#endif /* CONFIG_64BIT */
147
148/*
149 * Wrapper function for sys_fadvise64/fadvise64_64
150 */
151#ifndef CONFIG_64BIT
152
153SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
154 size_t, len, int, advice)
155{
156 return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
157 len, advice);
158}
159
160struct fadvise64_64_args {
161 int fd;
162 long long offset;
163 long long len;
164 int advice;
165};
166
167SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
168{
169 struct fadvise64_64_args a;
170
171 if ( copy_from_user(&a, args, sizeof(a)) )
172 return -EFAULT;
173 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
174}
175
176/*
177 * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
178 * 64 bit argument "len" is split into the upper and lower 32 bits. The
179 * system call wrapper in the user space loads the value to %r6/%r7.
180 * The code in entry.S keeps the values in %r2 - %r6 where they are and
181 * stores %r7 to 96(%r15). But the standard C linkage requires that
182 * the whole 64 bit value for len is stored on the stack and doesn't
183 * use %r6 at all. So s390_fallocate has to convert the arguments from
184 * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
185 * to
186 * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
187 */
188SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
189 u32 len_high, u32 len_low)
190{
191 return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
192}
193#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
194asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
195 long len_high, long len_low)
196{
197 return SYSC_s390_fallocate((int) fd, (int) mode, offset,
198 (u32) len_high, (u32) len_low);
199}
200SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
201#endif
202
203#endif