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 COMPAT_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
  41 COMPAT_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
  47 COMPAT_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
  53 COMPAT_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
  59 COMPAT_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
  68 COMPAT_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  */
  81 COMPAT_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  */
 105 void *compat_sys_call_table[__NR_syscalls] = {
 106         [0 ... __NR_syscalls-1] = sys_ni_syscall,
 107 #include <asm/unistd.h>
 108 };