LXR linux/arch/tile/kernel/compat.c

   1/*
   2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3 *
   4 *   This program is free software; you can redistribute it and/or
   5 *   modify it under the terms of the GNU General Public License
   6 *   as published by the Free Software Foundation, version 2.
   7 *
   8 *   This program is distributed in the hope that it will be useful, but
   9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11 *   NON INFRINGEMENT.  See the GNU General Public License for
  12 *   more details.
  13 */
  14
  15/* Adjust unistd.h to provide 32-bit numbers and functions. */
  16#define __SYSCALL_COMPAT
  17
  18#include <linux/compat.h>
  19#include <linux/syscalls.h>
  20#include <linux/kdev_t.h>
  21#include <linux/fs.h>
  22#include <linux/fcntl.h>
  23#include <linux/uaccess.h>
  24#include <linux/signal.h>
  25#include <asm/syscalls.h>
  26#include <asm/byteorder.h>
  27
  28/*
  29 * Syscalls that take 64-bit numbers traditionally take them in 32-bit
  30 * "high" and "low" value parts on 32-bit architectures.
  31 * In principle, one could imagine passing some register arguments as
  32 * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
  33 * adopt the usual convention.
  34 */
  35
  36#ifdef __BIG_ENDIAN
  37#define SYSCALL_PAIR(name) u32, name ## _hi, u32, name ## _lo
  38#else
  39#define SYSCALL_PAIR(name) u32, name ## _lo, u32, name ## _hi
  40#endif
  41
  42COMPAT_SYSCALL_DEFINE4(truncate64, char __user *, filename, u32, dummy,
  43                       SYSCALL_PAIR(length))
  44{
  45        return sys_truncate(filename, ((loff_t)length_hi << 32) | length_lo);
  46}
  47
  48COMPAT_SYSCALL_DEFINE4(ftruncate64, unsigned int, fd, u32, dummy,
  49                       SYSCALL_PAIR(length))
  50{
  51        return sys_ftruncate(fd, ((loff_t)length_hi << 32) | length_lo);
  52}
  53
  54COMPAT_SYSCALL_DEFINE6(pread64, unsigned int, fd, char __user *, ubuf,
  55                       size_t, count, u32, dummy, SYSCALL_PAIR(offset))
  56{
  57        return sys_pread64(fd, ubuf, count,
  58                           ((loff_t)offset_hi << 32) | offset_lo);
  59}
  60
  61COMPAT_SYSCALL_DEFINE6(pwrite64, unsigned int, fd, char __user *, ubuf,
  62                       size_t, count, u32, dummy, SYSCALL_PAIR(offset))
  63{
  64        return sys_pwrite64(fd, ubuf, count,
  65                            ((loff_t)offset_hi << 32) | offset_lo);
  66}
  67
  68COMPAT_SYSCALL_DEFINE6(sync_file_range2, int, fd, unsigned int, flags,
  69                       SYSCALL_PAIR(offset), SYSCALL_PAIR(nbytes))
  70{
  71        return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
  72                                   ((loff_t)nbytes_hi << 32) | nbytes_lo,
  73                                   flags);
  74}
  75
  76COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode,
  77                       SYSCALL_PAIR(offset), SYSCALL_PAIR(len))
  78{
  79        return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
  80                             ((loff_t)len_hi << 32) | len_lo);
  81}
  82
  83/*
  84 * Avoid bug in generic sys_llseek() that specifies offset_high and
  85 * offset_low as "unsigned long", thus making it possible to pass
  86 * a sign-extended high 32 bits in offset_low.
  87 * Note that we do not use SYSCALL_PAIR here since glibc passes the
  88 * high and low parts explicitly in that order.
  89 */
  90COMPAT_SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned int, offset_high,
  91                       unsigned int, offset_low, loff_t __user *, result,
  92                       unsigned int, origin)
  93{
  94        return sys_llseek(fd, offset_high, offset_low, result, origin);
  95}
  96
  97/* Provide the compat syscall number to call mapping. */
  98#undef __SYSCALL
  99#define __SYSCALL(nr, call) [nr] = (call),
 100
 101/* See comments in sys.c */
 102#define compat_sys_fadvise64_64 sys32_fadvise64_64
 103#define compat_sys_readahead sys32_readahead
 104#define sys_llseek compat_sys_llseek
 105
 106/* Call the assembly trampolines where necessary. */
 107#define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
 108#define sys_clone _sys_clone
 109
 110/*
 111 * Note that we can't include <linux/unistd.h> here since the header
 112 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 113 */
 114void *compat_sys_call_table[__NR_syscalls] = {
 115        [0 ... __NR_syscalls-1] = sys_ni_syscall,
 116#include <asm/unistd.h>
 117};
 118