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
41 struct 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
SYSCALL_DEFINE1(mmap2,struct s390_mmap_arg_struct __user *,arg)50 SYSCALL_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);
58 out:
59 return error;
60 }
61
62 /*
63 * sys_ipc() is the de-multiplexer for the SysV IPC calls.
64 */
SYSCALL_DEFINE5(s390_ipc,uint,call,int,first,unsigned long,second,unsigned long,third,void __user *,ptr)65 SYSCALL_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 sys_ipc(call, first, second, third, ptr, third);
79 }
80
81 #ifdef CONFIG_64BIT
SYSCALL_DEFINE1(s390_personality,unsigned int,personality)82 SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
83 {
84 unsigned int ret;
85
86 if (current->personality == PER_LINUX32 && personality == PER_LINUX)
87 personality = PER_LINUX32;
88 ret = sys_personality(personality);
89 if (ret == PER_LINUX32)
90 ret = PER_LINUX;
91
92 return ret;
93 }
94 #endif /* CONFIG_64BIT */
95
96 /*
97 * Wrapper function for sys_fadvise64/fadvise64_64
98 */
99 #ifndef CONFIG_64BIT
100
SYSCALL_DEFINE5(s390_fadvise64,int,fd,u32,offset_high,u32,offset_low,size_t,len,int,advice)101 SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
102 size_t, len, int, advice)
103 {
104 return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
105 len, advice);
106 }
107
108 struct fadvise64_64_args {
109 int fd;
110 long long offset;
111 long long len;
112 int advice;
113 };
114
SYSCALL_DEFINE1(s390_fadvise64_64,struct fadvise64_64_args __user *,args)115 SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
116 {
117 struct fadvise64_64_args a;
118
119 if ( copy_from_user(&a, args, sizeof(a)) )
120 return -EFAULT;
121 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
122 }
123
124 /*
125 * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
126 * 64 bit argument "len" is split into the upper and lower 32 bits. The
127 * system call wrapper in the user space loads the value to %r6/%r7.
128 * The code in entry.S keeps the values in %r2 - %r6 where they are and
129 * stores %r7 to 96(%r15). But the standard C linkage requires that
130 * the whole 64 bit value for len is stored on the stack and doesn't
131 * use %r6 at all. So s390_fallocate has to convert the arguments from
132 * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
133 * to
134 * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
135 */
SYSCALL_DEFINE(s390_fallocate)136 SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
137 u32 len_high, u32 len_low)
138 {
139 return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
140 }
141 #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
SyS_s390_fallocate(long fd,long mode,loff_t offset,long len_high,long len_low)142 asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
143 long len_high, long len_low)
144 {
145 return SYSC_s390_fallocate((int) fd, (int) mode, offset,
146 (u32) len_high, (u32) len_low);
147 }
148 SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
149 #endif
150
151 #endif
152