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