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
  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
  35 long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high)
  36 {
  37         return sys_truncate(filename, ((loff_t)high << 32) | low);
  38 }
  39
  40 long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high)
  41 {
  42         return sys_ftruncate(fd, ((loff_t)high << 32) | low);
  43 }
  44
  45 long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
  46                         u32 dummy, u32 low, u32 high)
  47 {
  48         return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
  49 }
  50
  51 long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
  52                          u32 dummy, u32 low, u32 high)
  53 {
  54         return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
  55 }
  56
  57 long compat_sys_sync_file_range2(int fd, unsigned int flags,
  58                                  u32 offset_lo, u32 offset_hi,
  59                                  u32 nbytes_lo, u32 nbytes_hi)
  60 {
  61         return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
  62                                    ((loff_t)nbytes_hi << 32) | nbytes_lo,
  63                                    flags);
  64 }
  65
  66 long compat_sys_fallocate(int fd, int mode,
  67                           u32 offset_lo, u32 offset_hi,
  68                           u32 len_lo, u32 len_hi)
  69 {
  70         return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
  71                              ((loff_t)len_hi << 32) | len_lo);
  72 }
  73
  74 /* Provide the compat syscall number to call mapping. */
  75 #undef __SYSCALL
  76 #define __SYSCALL(nr, call) [nr] = (call),
  77
  78 /* See comments in sys.c */
  79 #define compat_sys_fadvise64_64 sys32_fadvise64_64
  80 #define compat_sys_readahead sys32_readahead
  81
  82 /* Call the assembly trampolines where necessary. */
  83 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
  84 #define sys_clone _sys_clone
  85
  86 /*
  87  * Note that we can't include <linux/unistd.h> here since the header
  88  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
  89  */
  90 void *compat_sys_call_table[__NR_syscalls] = {
  91         [0 ... __NR_syscalls-1] = sys_ni_syscall,
  92 #include <asm/unistd.h>
  93 };