289 lines
7.2 KiB
C
289 lines
7.2 KiB
C
/*
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* arch/s390/kernel/sys_s390.c
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Thomas Spatzier (tspat@de.ibm.com)
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*
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* Derived from "arch/i386/kernel/sys_i386.c"
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/s390
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <linux/personality.h>
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#include <linux/unistd.h>
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#include <asm/uaccess.h>
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#include <asm/ipc.h>
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way Unix traditionally does this, though.
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*/
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asmlinkage long sys_pipe(unsigned long __user *fildes)
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{
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int fd[2];
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int error;
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error = do_pipe(fd);
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if (!error) {
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if (copy_to_user(fildes, fd, 2*sizeof(int)))
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error = -EFAULT;
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}
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return error;
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}
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/* common code for old and new mmaps */
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static inline long do_mmap2(
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unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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long error = -EBADF;
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struct file * file = NULL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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/*
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* Perform the select(nd, in, out, ex, tv) and mmap() system
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* calls. Linux for S/390 isn't able to handle more than 5
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* system call parameters, so these system calls used a memory
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* block for parameter passing..
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*/
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struct mmap_arg_struct {
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unsigned long addr;
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unsigned long len;
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unsigned long prot;
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unsigned long flags;
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unsigned long fd;
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unsigned long offset;
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};
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asmlinkage long sys_mmap2(struct mmap_arg_struct __user *arg)
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{
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struct mmap_arg_struct a;
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int error = -EFAULT;
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if (copy_from_user(&a, arg, sizeof(a)))
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goto out;
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error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
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out:
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return error;
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}
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asmlinkage long old_mmap(struct mmap_arg_struct __user *arg)
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{
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struct mmap_arg_struct a;
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long error = -EFAULT;
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if (copy_from_user(&a, arg, sizeof(a)))
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goto out;
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error = -EINVAL;
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if (a.offset & ~PAGE_MASK)
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goto out;
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error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
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out:
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return error;
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}
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#ifndef CONFIG_64BIT
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struct sel_arg_struct {
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unsigned long n;
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fd_set __user *inp, *outp, *exp;
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struct timeval __user *tvp;
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};
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asmlinkage long old_select(struct sel_arg_struct __user *arg)
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{
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struct sel_arg_struct a;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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/* sys_select() does the appropriate kernel locking */
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return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
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}
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#endif /* CONFIG_64BIT */
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly.
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*/
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asmlinkage long sys_ipc(uint call, int first, unsigned long second,
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unsigned long third, void __user *ptr)
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{
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struct ipc_kludge tmp;
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int ret;
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switch (call) {
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case SEMOP:
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return sys_semtimedop(first, (struct sembuf __user *)ptr,
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(unsigned)second, NULL);
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case SEMTIMEDOP:
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return sys_semtimedop(first, (struct sembuf __user *)ptr,
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(unsigned)second,
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(const struct timespec __user *) third);
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case SEMGET:
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return sys_semget(first, (int)second, third);
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case SEMCTL: {
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union semun fourth;
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if (!ptr)
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return -EINVAL;
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if (get_user(fourth.__pad, (void __user * __user *) ptr))
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return -EFAULT;
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return sys_semctl(first, (int)second, third, fourth);
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}
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case MSGSND:
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return sys_msgsnd (first, (struct msgbuf __user *) ptr,
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(size_t)second, third);
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break;
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case MSGRCV:
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if (!ptr)
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return -EINVAL;
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if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
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sizeof (struct ipc_kludge)))
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return -EFAULT;
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return sys_msgrcv (first, tmp.msgp,
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(size_t)second, tmp.msgtyp, third);
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case MSGGET:
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return sys_msgget((key_t)first, (int)second);
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case MSGCTL:
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return sys_msgctl(first, (int)second,
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(struct msqid_ds __user *)ptr);
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case SHMAT: {
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ulong raddr;
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ret = do_shmat(first, (char __user *)ptr,
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(int)second, &raddr);
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if (ret)
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return ret;
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return put_user (raddr, (ulong __user *) third);
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break;
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}
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case SHMDT:
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return sys_shmdt ((char __user *)ptr);
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case SHMGET:
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return sys_shmget(first, (size_t)second, third);
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case SHMCTL:
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return sys_shmctl(first, (int)second,
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(struct shmid_ds __user *) ptr);
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default:
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return -ENOSYS;
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}
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return -EINVAL;
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}
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#ifdef CONFIG_64BIT
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asmlinkage long s390x_newuname(struct new_utsname __user *name)
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{
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int ret = sys_newuname(name);
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if (current->personality == PER_LINUX32 && !ret) {
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ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
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if (ret) ret = -EFAULT;
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}
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return ret;
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}
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asmlinkage long s390x_personality(unsigned long personality)
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{
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int ret;
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if (current->personality == PER_LINUX32 && personality == PER_LINUX)
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personality = PER_LINUX32;
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ret = sys_personality(personality);
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if (ret == PER_LINUX32)
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ret = PER_LINUX;
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return ret;
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}
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#endif /* CONFIG_64BIT */
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/*
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* Wrapper function for sys_fadvise64/fadvise64_64
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*/
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#ifndef CONFIG_64BIT
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asmlinkage long
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s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
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{
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return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
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len, advice);
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}
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#endif
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struct fadvise64_64_args {
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int fd;
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long long offset;
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long long len;
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int advice;
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};
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asmlinkage long
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s390_fadvise64_64(struct fadvise64_64_args __user *args)
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{
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struct fadvise64_64_args a;
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if ( copy_from_user(&a, args, sizeof(a)) )
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return -EFAULT;
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return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
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}
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#ifndef CONFIG_64BIT
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/*
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* This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
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* 64 bit argument "len" is split into the upper and lower 32 bits. The
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* system call wrapper in the user space loads the value to %r6/%r7.
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* The code in entry.S keeps the values in %r2 - %r6 where they are and
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* stores %r7 to 96(%r15). But the standard C linkage requires that
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* the whole 64 bit value for len is stored on the stack and doesn't
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* use %r6 at all. So s390_fallocate has to convert the arguments from
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* %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
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* to
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* %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
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*/
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asmlinkage long s390_fallocate(int fd, int mode, loff_t offset,
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u32 len_high, u32 len_low)
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{
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return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
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}
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#endif
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