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