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330 lines
8.2 KiB
330 lines
8.2 KiB
/*
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* Implementation of various system calls for Linux/PowerPC
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*
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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/syscalls.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/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/init.h>
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#include <linux/personality.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <asm/syscalls.h>
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#include <asm/time.h>
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#include <asm/unistd.h>
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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 sys_ipc(uint call, int first, unsigned long second, long third,
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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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(unsigned)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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(unsigned)second,
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(const struct timespec __user *) fifth);
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break;
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case SEMGET:
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ret = sys_semget (first, (int)second, third);
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break;
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case SEMCTL: {
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union semun fourth;
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ret = -EINVAL;
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if (!ptr)
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break;
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if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
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break;
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ret = sys_semctl(first, (int)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,
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(size_t)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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ret = -EINVAL;
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if (!ptr)
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break;
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if ((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, (size_t) second,
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tmp.msgtyp, 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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(size_t)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, (int)second);
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break;
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case MSGCTL:
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ret = sys_msgctl(first, (int)second,
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(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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ret = do_shmat(first, (char __user *)ptr, (int)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, (size_t)second, third);
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break;
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case SHMCTL:
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ret = sys_shmctl(first, (int)second,
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(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 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 off, int shift)
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{
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struct file * file = NULL;
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unsigned long ret = -EINVAL;
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if (shift) {
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if (off & ((1 << shift) - 1))
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goto out;
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off >>= shift;
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}
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ret = -EBADF;
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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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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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down_write(¤t->mm->mmap_sem);
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ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
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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, PAGE_SHIFT-12);
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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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return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
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}
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#ifdef CONFIG_PPC32
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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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#endif
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#ifdef CONFIG_PPC64
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long ppc64_personality(unsigned long personality)
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{
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long ret;
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if (personality(current->personality) == PER_LINUX32
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&& 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
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#ifdef CONFIG_PPC64
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#define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
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#else
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#define OVERRIDE_MACHINE 0
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#endif
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static inline int override_machine(char __user *mach)
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{
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if (OVERRIDE_MACHINE) {
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/* change ppc64 to ppc */
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if (__put_user(0, mach+3) || __put_user(0, mach+4))
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return -EFAULT;
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}
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return 0;
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}
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long ppc_newuname(struct new_utsname __user * name)
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{
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int err = 0;
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down_read(&uts_sem);
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if (copy_to_user(name, utsname(), sizeof(*name)))
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err = -EFAULT;
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up_read(&uts_sem);
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if (!err)
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err = override_machine(name->machine);
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return err;
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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 = 0;
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down_read(&uts_sem);
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if (copy_to_user(name, utsname(), sizeof(*name)))
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err = -EFAULT;
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up_read(&uts_sem);
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if (!err)
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err = override_machine(name->machine);
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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 (!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, &utsname()->sysname,
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__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, &utsname()->nodename,
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__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, &utsname()->release,
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__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, &utsname()->version,
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__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, &utsname()->machine,
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__OLD_UTS_LEN);
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error |= override_machine(name->machine);
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up_read(&uts_sem);
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return error? -EFAULT: 0;
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}
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long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
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u32 len_high, u32 len_low)
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{
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return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
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(u64)len_high << 32 | len_low, advice);
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}
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void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7, unsigned long r8,
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struct pt_regs *regs)
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{
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printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
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" cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
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current, smp_processor_id());
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}
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void do_show_syscall_exit(unsigned long r3)
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{
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printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
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}
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