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 <linux/uaccess.h>
  40#include <asm/syscalls.h>
  41#include <asm/time.h>
  42#include <asm/unistd.h>
  43#include <asm/asm-prototypes.h>
  44
  45static inline long do_mmap2(unsigned long addr, size_t len,
  46                        unsigned long prot, unsigned long flags,
  47                        unsigned long fd, unsigned long off, int shift)
  48{
  49        long ret = -EINVAL;
  50
  51        if (!arch_validate_prot(prot, addr))
  52                goto out;
  53
  54        if (shift) {
  55                if (off & ((1 << shift) - 1))
  56                        goto out;
  57                off >>= shift;
  58        }
  59
  60        ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off);
  61out:
  62        return ret;
  63}
  64
  65SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
  66                unsigned long, prot, unsigned long, flags,
  67                unsigned long, fd, unsigned long, pgoff)
  68{
  69        return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
  70}
  71
  72SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
  73                unsigned long, prot, unsigned long, flags,
  74                unsigned long, fd, off_t, offset)
  75{
  76        return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
  77}
  78
  79#ifdef CONFIG_PPC32
  80/*
  81 * Due to some executables calling the wrong select we sometimes
  82 * get wrong args.  This determines how the args are being passed
  83 * (a single ptr to them all args passed) then calls
  84 * sys_select() with the appropriate args. -- Cort
  85 */
  86int
  87ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
  88{
  89        if ( (unsigned long)n >= 4096 )
  90        {
  91                unsigned long __user *buffer = (unsigned long __user *)n;
  92                if (!access_ok(buffer, 5*sizeof(unsigned long))
  93                    || __get_user(n, buffer)
  94                    || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
  95                    || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
  96                    || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
  97                    || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
  98                        return -EFAULT;
  99        }
 100        return sys_select(n, inp, outp, exp, tvp);
 101}
 102#endif
 103
 104#ifdef CONFIG_PPC64
 105long ppc64_personality(unsigned long personality)
 106{
 107        long ret;
 108
 109        if (personality(current->personality) == PER_LINUX32
 110            && personality(personality) == PER_LINUX)
 111                personality = (personality & ~PER_MASK) | PER_LINUX32;
 112        ret = sys_personality(personality);
 113        if (personality(ret) == PER_LINUX32)
 114                ret = (ret & ~PER_MASK) | PER_LINUX;
 115        return ret;
 116}
 117#endif
 118
 119long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
 120                      u32 len_high, u32 len_low)
 121{
 122        return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,
 123                                 (u64)len_high << 32 | len_low, advice);
 124}
 125
 126long sys_switch_endian(void)
 127{
 128        struct thread_info *ti;
 129
 130        current->thread.regs->msr ^= MSR_LE;
 131
 132        /*
 133         * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
 134         * userspace. That also has the effect of restoring the non-volatile
 135         * GPRs, so we saved them on the way in here.
 136         */
 137        ti = current_thread_info();
 138        ti->flags |= _TIF_RESTOREALL;
 139
 140        return 0;
 141}
 142