linux/arch/tile/kernel/compat.c
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   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
  27/*
  28 * Syscalls that take 64-bit numbers traditionally take them in 32-bit
  29 * "high" and "low" value parts on 32-bit architectures.
  30 * In principle, one could imagine passing some register arguments as
  31 * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
  32 * adapt the usual convention.
  33 */
  34
  35COMPAT_SYSCALL_DEFINE4(truncate64, char __user *, filename, u32, dummy,
  36                       u32, low, u32, high)
  37{
  38        return sys_truncate(filename, ((loff_t)high << 32) | low);
  39}
  40
  41COMPAT_SYSCALL_DEFINE4(ftruncate64, unsigned int, fd, u32, dummy,
  42                       u32, low, u32, high)
  43{
  44        return sys_ftruncate(fd, ((loff_t)high << 32) | low);
  45}
  46
  47COMPAT_SYSCALL_DEFINE6(pread64, unsigned int, fd, char __user *, ubuf,
  48                       size_t, count, u32, dummy, u32, low, u32, high)
  49{
  50        return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
  51}
  52
  53COMPAT_SYSCALL_DEFINE6(pwrite64, unsigned int, fd, char __user *, ubuf,
  54                       size_t, count, u32, dummy, u32, low, u32, high)
  55{
  56        return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
  57}
  58
  59COMPAT_SYSCALL_DEFINE6(sync_file_range2, int, fd, unsigned int, flags,
  60                       u32, offset_lo, u32, offset_hi,
  61                       u32, nbytes_lo, u32, nbytes_hi)
  62{
  63        return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
  64                                   ((loff_t)nbytes_hi << 32) | nbytes_lo,
  65                                   flags);
  66}
  67
  68COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode,
  69                       u32, offset_lo, u32, offset_hi,
  70                       u32, len_lo, u32, len_hi)
  71{
  72        return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
  73                             ((loff_t)len_hi << 32) | len_lo);
  74}
  75
  76/*
  77 * Avoid bug in generic sys_llseek() that specifies offset_high and
  78 * offset_low as "unsigned long", thus making it possible to pass
  79 * a sign-extended high 32 bits in offset_low.
  80 */
  81COMPAT_SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned int, offset_high,
  82                       unsigned int, offset_low, loff_t __user *, result,
  83                       unsigned int, origin)
  84{
  85        return sys_llseek(fd, offset_high, offset_low, result, origin);
  86}
  87 
  88/* Provide the compat syscall number to call mapping. */
  89#undef __SYSCALL
  90#define __SYSCALL(nr, call) [nr] = (call),
  91
  92/* See comments in sys.c */
  93#define compat_sys_fadvise64_64 sys32_fadvise64_64
  94#define compat_sys_readahead sys32_readahead
  95#define sys_llseek compat_sys_llseek
  96
  97/* Call the assembly trampolines where necessary. */
  98#define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
  99#define sys_clone _sys_clone
 100
 101/*
 102 * Note that we can't include <linux/unistd.h> here since the header
 103 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 104 */
 105void *compat_sys_call_table[__NR_syscalls] = {
 106        [0 ... __NR_syscalls-1] = sys_ni_syscall,
 107#include <asm/unistd.h>
 108};
 109