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
COMPAT_SYSCALL_DEFINE4(truncate64,char __user *,filename,u32,dummy,u32,low,u32,high)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
COMPAT_SYSCALL_DEFINE4(ftruncate64,unsigned int,fd,u32,dummy,u32,low,u32,high)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
COMPAT_SYSCALL_DEFINE6(pread64,unsigned int,fd,char __user *,ubuf,size_t,count,u32,dummy,u32,low,u32,high)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
COMPAT_SYSCALL_DEFINE6(pwrite64,unsigned int,fd,char __user *,ubuf,size_t,count,u32,dummy,u32,low,u32,high)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
COMPAT_SYSCALL_DEFINE6(sync_file_range2,int,fd,unsigned int,flags,u32,offset_lo,u32,offset_hi,u32,nbytes_lo,u32,nbytes_hi)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
COMPAT_SYSCALL_DEFINE6(fallocate,int,fd,int,mode,u32,offset_lo,u32,offset_hi,u32,len_lo,u32,len_hi)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 */
COMPAT_SYSCALL_DEFINE5(llseek,unsigned int,fd,unsigned int,offset_high,unsigned int,offset_low,loff_t __user *,result,unsigned int,origin)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 };
109