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/*
* arch/s390/kernel/sys_s390.c
*
* S390 version
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Thomas Spatzier (tspat@de.ibm.com)
*
* Derived from "arch/i386/kernel/sys_i386.c"
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/s390
* platform.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/personality.h>
#include <linux/unistd.h>
#include <linux/ipc.h>
#include <asm/uaccess.h>
#include "entry.h"
/*
* Perform the mmap() system call. Linux for S/390 isn't able to handle more
* than 5 system call parameters, so this system call uses a memory block
* for parameter passing.
*/
struct s390_mmap_arg_struct {
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};
SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
{
struct s390_mmap_arg_struct a;
int error = -EFAULT;
if (copy_from_user(&a, arg, sizeof(a)))
goto out;
error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
out:
return error;
}
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
unsigned long, third, void __user *, ptr)
{
struct ipc_kludge tmp;
int ret;
switch (call) {
case SEMOP:
return sys_semtimedop(first, (struct sembuf __user *)ptr,
(unsigned)second, NULL);
case SEMTIMEDOP:
return sys_semtimedop(first, (struct sembuf __user *)ptr,
(unsigned)second,
(const struct timespec __user *) third);
case SEMGET:
return sys_semget(first, (int)second, third);
case SEMCTL: {
union semun fourth;
if (!ptr)
return -EINVAL;
if (get_user(fourth.__pad, (void __user * __user *) ptr))
return -EFAULT;
return sys_semctl(first, (int)second, third, fourth);
}
case MSGSND:
return sys_msgsnd (first, (struct msgbuf __user *) ptr,
(size_t)second, third);
break;
case MSGRCV:
if (!ptr)
return -EINVAL;
if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
sizeof (struct ipc_kludge)))
return -EFAULT;
return sys_msgrcv (first, tmp.msgp,
(size_t)second, tmp.msgtyp, third);
case MSGGET:
return sys_msgget((key_t)first, (int)second);
case MSGCTL:
return sys_msgctl(first, (int)second,
(struct msqid_ds __user *)ptr);
case SHMAT: {
ulong raddr;
ret = do_shmat(first, (char __user *)ptr,
(int)second, &raddr);
if (ret)
return ret;
return put_user (raddr, (ulong __user *) third);
break;
}
case SHMDT:
return sys_shmdt ((char __user *)ptr);
case SHMGET:
return sys_shmget(first, (size_t)second, third);
case SHMCTL:
return sys_shmctl(first, (int)second,
(struct shmid_ds __user *) ptr);
default:
return -ENOSYS;
}
return -EINVAL;
}
#ifdef CONFIG_64BIT
SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name)
{
int ret = sys_newuname(name);
if (personality(current->personality) == PER_LINUX32 && !ret) {
ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
if (ret) ret = -EFAULT;
}
return ret;
}
SYSCALL_DEFINE1(s390_personality, unsigned long, personality)
{
int ret;
if (current->personality == PER_LINUX32 && personality == PER_LINUX)
personality = PER_LINUX32;
ret = sys_personality(personality);
if (ret == PER_LINUX32)
ret = PER_LINUX;
return ret;
}
#endif /* CONFIG_64BIT */
/*
* Wrapper function for sys_fadvise64/fadvise64_64
*/
#ifndef CONFIG_64BIT
SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
size_t, len, int, advice)
{
return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
len, advice);
}
struct fadvise64_64_args {
int fd;
long long offset;
long long len;
int advice;
};
SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
{
struct fadvise64_64_args a;
if ( copy_from_user(&a, args, sizeof(a)) )
return -EFAULT;
return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}
/*
* This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
* 64 bit argument "len" is split into the upper and lower 32 bits. The
* system call wrapper in the user space loads the value to %r6/%r7.
* The code in entry.S keeps the values in %r2 - %r6 where they are and
* stores %r7 to 96(%r15). But the standard C linkage requires that
* the whole 64 bit value for len is stored on the stack and doesn't
* use %r6 at all. So s390_fallocate has to convert the arguments from
* %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
* to
* %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
*/
SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
u32 len_high, u32 len_low)
{
return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
}
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
long len_high, long len_low)
{
return SYSC_s390_fallocate((int) fd, (int) mode, offset,
(u32) len_high, (u32) len_low);
}
SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
#endif
#endif
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