LXR linux/arch/powerpc/kernel/syscalls.c

   1/*
   2 *  Implementation of various system calls for Linux/PowerPC
   3 *
   4 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   5 *
   6 * Derived from "arch/i386/kernel/sys_i386.c"
   7 * Adapted from the i386 version by Gary Thomas
   8 * Modified by Cort Dougan (cort@cs.nmt.edu)
   9 * and Paul Mackerras (paulus@cs.anu.edu.au).
  10 *
  11 * This file contains various random system calls that
  12 * have a non-standard calling sequence on the Linux/PPC
  13 * platform.
  14 *
  15 *  This program is free software; you can redistribute it and/or
  16 *  modify it under the terms of the GNU General Public License
  17 *  as published by the Free Software Foundation; either version
  18 *  2 of the License, or (at your option) any later version.
  19 *
  20 */
  21
  22#include <linux/errno.h>
  23#include <linux/sched.h>
  24#include <linux/syscalls.h>
  25#include <linux/mm.h>
  26#include <linux/fs.h>
  27#include <linux/smp.h>
  28#include <linux/sem.h>
  29#include <linux/msg.h>
  30#include <linux/shm.h>
  31#include <linux/stat.h>
  32#include <linux/mman.h>
  33#include <linux/sys.h>
  34#include <linux/ipc.h>
  35#include <linux/utsname.h>
  36#include <linux/file.h>
  37#include <linux/personality.h>
  38
  39#include <asm/uaccess.h>
  40#include <asm/syscalls.h>
  41#include <asm/time.h>
  42#include <asm/unistd.h>
  43
  44static inline unsigned long do_mmap2(unsigned long addr, size_t len,
  45                        unsigned long prot, unsigned long flags,
  46                        unsigned long fd, unsigned long off, int shift)
  47{
  48        unsigned long ret = -EINVAL;
  49
  50        if (!arch_validate_prot(prot))
  51                goto out;
  52
  53        if (shift) {
  54                if (off & ((1 << shift) - 1))
  55                        goto out;
  56                off >>= shift;
  57        }
  58
  59        ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off);
  60out:
  61        return ret;
  62}
  63
  64unsigned long sys_mmap2(unsigned long addr, size_t len,
  65                        unsigned long prot, unsigned long flags,
  66                        unsigned long fd, unsigned long pgoff)
  67{
  68        return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
  69}
  70
  71unsigned long sys_mmap(unsigned long addr, size_t len,
  72                       unsigned long prot, unsigned long flags,
  73                       unsigned long fd, off_t offset)
  74{
  75        return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
  76}
  77
  78#ifdef CONFIG_PPC32
  79/*
  80 * Due to some executables calling the wrong select we sometimes
  81 * get wrong args.  This determines how the args are being passed
  82 * (a single ptr to them all args passed) then calls
  83 * sys_select() with the appropriate args. -- Cort
  84 */
  85int
  86ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
  87{
  88        if ( (unsigned long)n >= 4096 )
  89        {
  90                unsigned long __user *buffer = (unsigned long __user *)n;
  91                if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
  92                    || __get_user(n, buffer)
  93                    || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
  94                    || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
  95                    || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
  96                    || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
  97                        return -EFAULT;
  98        }
  99        return sys_select(n, inp, outp, exp, tvp);
 100}
 101#endif
 102
 103#ifdef CONFIG_PPC64
 104long ppc64_personality(unsigned long personality)
 105{
 106        long ret;
 107
 108        if (personality(current->personality) == PER_LINUX32
 109            && personality(personality) == PER_LINUX)
 110                personality = (personality & ~PER_MASK) | PER_LINUX32;
 111        ret = sys_personality(personality);
 112        if (personality(ret) == PER_LINUX32)
 113                ret = (ret & ~PER_MASK) | PER_LINUX;
 114        return ret;
 115}
 116#endif
 117
 118long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
 119                      u32 len_high, u32 len_low)
 120{
 121        return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
 122                             (u64)len_high << 32 | len_low, advice);
 123}
 124
 125long sys_switch_endian(void)
 126{
 127        struct thread_info *ti;
 128
 129        current->thread.regs->msr ^= MSR_LE;
 130
 131        /*
 132         * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
 133         * userspace. That also has the effect of restoring the non-volatile
 134         * GPRs, so we saved them on the way in here.
 135         */
 136        ti = current_thread_info();
 137        ti->flags |= _TIF_RESTOREALL;
 138
 139        return 0;
 140}
 141