2 * arch/s390/kernel/sys_s390.c
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)
9 * Derived from "arch/i386/kernel/sys_i386.c"
11 * This file contains various random system calls that
12 * have a non-standard calling sequence on the Linux/s390
16 #include <linux/errno.h>
17 #include <linux/sched.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>
35 /* common code for old and new mmaps */
36 static inline long do_mmap2(
37 unsigned long addr, unsigned long len,
38 unsigned long prot, unsigned long flags,
39 unsigned long fd, unsigned long pgoff)
42 struct file * file = NULL;
44 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
45 if (!(flags & MAP_ANONYMOUS)) {
51 down_write(¤t->mm->mmap_sem);
52 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
53 up_write(¤t->mm->mmap_sem);
62 * Perform the select(nd, in, out, ex, tv) and mmap() system
63 * calls. Linux for S/390 isn't able to handle more than 5
64 * system call parameters, so these system calls used a memory
65 * block for parameter passing..
68 struct mmap_arg_struct {
77 asmlinkage long sys_mmap2(struct mmap_arg_struct __user *arg)
79 struct mmap_arg_struct a;
82 if (copy_from_user(&a, arg, sizeof(a)))
84 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
89 asmlinkage long old_mmap(struct mmap_arg_struct __user *arg)
91 struct mmap_arg_struct a;
94 if (copy_from_user(&a, arg, sizeof(a)))
98 if (a.offset & ~PAGE_MASK)
101 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
107 struct sel_arg_struct {
109 fd_set __user *inp, *outp, *exp;
110 struct timeval __user *tvp;
113 asmlinkage long old_select(struct sel_arg_struct __user *arg)
115 struct sel_arg_struct a;
117 if (copy_from_user(&a, arg, sizeof(a)))
119 /* sys_select() does the appropriate kernel locking */
120 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
123 #endif /* CONFIG_64BIT */
126 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
128 * This is really horribly ugly.
130 asmlinkage long sys_ipc(uint call, int first, unsigned long second,
131 unsigned long third, void __user *ptr)
133 struct ipc_kludge tmp;
138 return sys_semtimedop(first, (struct sembuf __user *)ptr,
139 (unsigned)second, NULL);
141 return sys_semtimedop(first, (struct sembuf __user *)ptr,
143 (const struct timespec __user *) third);
145 return sys_semget(first, (int)second, third);
150 if (get_user(fourth.__pad, (void __user * __user *) ptr))
152 return sys_semctl(first, (int)second, third, fourth);
155 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
156 (size_t)second, third);
161 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
162 sizeof (struct ipc_kludge)))
164 return sys_msgrcv (first, tmp.msgp,
165 (size_t)second, tmp.msgtyp, third);
167 return sys_msgget((key_t)first, (int)second);
169 return sys_msgctl(first, (int)second,
170 (struct msqid_ds __user *)ptr);
174 ret = do_shmat(first, (char __user *)ptr,
175 (int)second, &raddr);
178 return put_user (raddr, (ulong __user *) third);
182 return sys_shmdt ((char __user *)ptr);
184 return sys_shmget(first, (size_t)second, third);
186 return sys_shmctl(first, (int)second,
187 (struct shmid_ds __user *) ptr);
197 asmlinkage long s390x_newuname(struct new_utsname __user *name)
199 int ret = sys_newuname(name);
201 if (personality(current->personality) == PER_LINUX32 && !ret) {
202 ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
203 if (ret) ret = -EFAULT;
208 asmlinkage long s390x_personality(unsigned long personality)
212 if (current->personality == PER_LINUX32 && personality == PER_LINUX)
213 personality = PER_LINUX32;
214 ret = sys_personality(personality);
215 if (ret == PER_LINUX32)
220 #endif /* CONFIG_64BIT */
223 * Wrapper function for sys_fadvise64/fadvise64_64
228 s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
230 return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
236 struct fadvise64_64_args {
244 s390_fadvise64_64(struct fadvise64_64_args __user *args)
246 struct fadvise64_64_args a;
248 if ( copy_from_user(&a, args, sizeof(a)) )
250 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
255 * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
256 * 64 bit argument "len" is split into the upper and lower 32 bits. The
257 * system call wrapper in the user space loads the value to %r6/%r7.
258 * The code in entry.S keeps the values in %r2 - %r6 where they are and
259 * stores %r7 to 96(%r15). But the standard C linkage requires that
260 * the whole 64 bit value for len is stored on the stack and doesn't
261 * use %r6 at all. So s390_fallocate has to convert the arguments from
262 * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
264 * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
266 asmlinkage long s390_fallocate(int fd, int mode, loff_t offset,
267 u32 len_high, u32 len_low)
269 return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);