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272 lines
6.9 KiB
272 lines
6.9 KiB
/*
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* arch/ppc/kernel/sys_ppc.c
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*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Derived from "arch/i386/kernel/sys_i386.c"
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* Adapted from the i386 version by Gary Thomas
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras (paulus@cs.anu.edu.au).
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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/PPC
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* platform.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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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/smp.h>
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#include <linux/smp_lock.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/sys.h>
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#include <linux/ipc.h>
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#include <linux/utsname.h>
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#include <linux/file.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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#include <asm/semaphore.h>
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void
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check_bugs(void)
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{
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}
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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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int
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sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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ret = -ENOSYS;
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switch (call) {
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case SEMOP:
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ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
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second, NULL);
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break;
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case SEMTIMEDOP:
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ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
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second, (const struct timespec __user *) fifth);
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break;
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case SEMGET:
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ret = sys_semget (first, second, third);
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break;
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case SEMCTL: {
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union semun fourth;
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if (!ptr)
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break;
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if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
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|| (ret = get_user(fourth.__pad, (void __user *__user *)ptr)))
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break;
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ret = sys_semctl (first, second, third, fourth);
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break;
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}
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case MSGSND:
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ret = sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third);
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break;
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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if (!ptr)
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break;
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if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
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|| (ret = copy_from_user(&tmp,
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(struct ipc_kludge __user *) ptr,
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sizeof (tmp)) ? -EFAULT : 0))
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break;
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ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
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third);
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break;
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}
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default:
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ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
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second, fifth, third);
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break;
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}
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break;
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case MSGGET:
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ret = sys_msgget ((key_t) first, second);
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break;
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case MSGCTL:
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ret = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
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break;
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case SHMAT: {
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ulong raddr;
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if ((ret = access_ok(VERIFY_WRITE, (ulong __user *) third,
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sizeof(ulong)) ? 0 : -EFAULT))
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break;
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ret = do_shmat (first, (char __user *) ptr, second, &raddr);
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if (ret)
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break;
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ret = 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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ret = sys_shmdt ((char __user *)ptr);
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break;
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case SHMGET:
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ret = sys_shmget (first, second, third);
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break;
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case SHMCTL:
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ret = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
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break;
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}
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return ret;
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}
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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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int sys_pipe(int __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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static inline unsigned long
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do_mmap2(unsigned long addr, size_t 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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struct file * file = NULL;
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int ret = -EBADF;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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if (!(file = fget(fd)))
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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ret = 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 ret;
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}
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unsigned long sys_mmap2(unsigned long addr, size_t 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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return do_mmap2(addr, len, prot, flags, fd, pgoff);
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}
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unsigned long sys_mmap(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, off_t offset)
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{
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int err = -EINVAL;
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if (offset & ~PAGE_MASK)
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goto out;
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err = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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out:
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return err;
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}
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/*
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* Due to some executables calling the wrong select we sometimes
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* get wrong args. This determines how the args are being passed
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* (a single ptr to them all args passed) then calls
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* sys_select() with the appropriate args. -- Cort
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*/
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int
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ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
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{
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if ( (unsigned long)n >= 4096 )
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{
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unsigned long __user *buffer = (unsigned long __user *)n;
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if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
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|| __get_user(n, buffer)
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|| __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
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|| __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
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|| __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
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|| __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
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return -EFAULT;
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}
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return sys_select(n, inp, outp, exp, tvp);
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}
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int sys_uname(struct old_utsname __user * name)
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{
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int err = -EFAULT;
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down_read(&uts_sem);
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if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
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err = 0;
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up_read(&uts_sem);
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return err;
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}
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int sys_olduname(struct oldold_utsname __user * name)
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{
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int error;
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if (!name)
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return -EFAULT;
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if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
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return -EFAULT;
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down_read(&uts_sem);
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error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
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error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
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error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
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error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
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error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
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error -= __put_user(0,name->release+__OLD_UTS_LEN);
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error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
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error -= __put_user(0,name->version+__OLD_UTS_LEN);
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error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
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error = __put_user(0,name->machine+__OLD_UTS_LEN);
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up_read(&uts_sem);
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error = error ? -EFAULT : 0;
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return error;
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}
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/*
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* We put the arguments in a different order so we only use 6
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* registers for arguments, rather than 7 as sys_fadvise64_64 needs
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* (because `offset' goes in r5/r6).
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*/
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long ppc_fadvise64_64(int fd, int advice, loff_t offset, loff_t len)
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{
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return sys_fadvise64_64(fd, offset, len, advice);
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}
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