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 #include <asm/byteorder.h>
27
28 /*
29 * Syscalls that take 64-bit numbers traditionally take them in 32-bit
30 * "high" and "low" value parts on 32-bit architectures.
31 * In principle, one could imagine passing some register arguments as
32 * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
33 * adopt the usual convention.
34 */
35
36 #ifdef __BIG_ENDIAN
37 #define SYSCALL_PAIR(name) u32, name ## _hi, u32, name ## _lo
38 #else
39 #define SYSCALL_PAIR(name) u32, name ## _lo, u32, name ## _hi
40 #endif
41
COMPAT_SYSCALL_DEFINE4(truncate64,char __user *,filename,u32,dummy,SYSCALL_PAIR (length))42 COMPAT_SYSCALL_DEFINE4(truncate64, char __user *, filename, u32, dummy,
43 SYSCALL_PAIR(length))
44 {
45 return sys_truncate(filename, ((loff_t)length_hi << 32) | length_lo);
46 }
47
COMPAT_SYSCALL_DEFINE4(ftruncate64,unsigned int,fd,u32,dummy,SYSCALL_PAIR (length))48 COMPAT_SYSCALL_DEFINE4(ftruncate64, unsigned int, fd, u32, dummy,
49 SYSCALL_PAIR(length))
50 {
51 return sys_ftruncate(fd, ((loff_t)length_hi << 32) | length_lo);
52 }
53
COMPAT_SYSCALL_DEFINE6(pread64,unsigned int,fd,char __user *,ubuf,size_t,count,u32,dummy,SYSCALL_PAIR (offset))54 COMPAT_SYSCALL_DEFINE6(pread64, unsigned int, fd, char __user *, ubuf,
55 size_t, count, u32, dummy, SYSCALL_PAIR(offset))
56 {
57 return sys_pread64(fd, ubuf, count,
58 ((loff_t)offset_hi << 32) | offset_lo);
59 }
60
COMPAT_SYSCALL_DEFINE6(pwrite64,unsigned int,fd,char __user *,ubuf,size_t,count,u32,dummy,SYSCALL_PAIR (offset))61 COMPAT_SYSCALL_DEFINE6(pwrite64, unsigned int, fd, char __user *, ubuf,
62 size_t, count, u32, dummy, SYSCALL_PAIR(offset))
63 {
64 return sys_pwrite64(fd, ubuf, count,
65 ((loff_t)offset_hi << 32) | offset_lo);
66 }
67
COMPAT_SYSCALL_DEFINE6(sync_file_range2,int,fd,unsigned int,flags,SYSCALL_PAIR (offset),SYSCALL_PAIR (nbytes))68 COMPAT_SYSCALL_DEFINE6(sync_file_range2, int, fd, unsigned int, flags,
69 SYSCALL_PAIR(offset), SYSCALL_PAIR(nbytes))
70 {
71 return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
72 ((loff_t)nbytes_hi << 32) | nbytes_lo,
73 flags);
74 }
75
COMPAT_SYSCALL_DEFINE6(fallocate,int,fd,int,mode,SYSCALL_PAIR (offset),SYSCALL_PAIR (len))76 COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode,
77 SYSCALL_PAIR(offset), SYSCALL_PAIR(len))
78 {
79 return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
80 ((loff_t)len_hi << 32) | len_lo);
81 }
82
83 /*
84 * Avoid bug in generic sys_llseek() that specifies offset_high and
85 * offset_low as "unsigned long", thus making it possible to pass
86 * a sign-extended high 32 bits in offset_low.
87 * Note that we do not use SYSCALL_PAIR here since glibc passes the
88 * high and low parts explicitly in that order.
89 */
COMPAT_SYSCALL_DEFINE5(llseek,unsigned int,fd,unsigned int,offset_high,unsigned int,offset_low,loff_t __user *,result,unsigned int,origin)90 COMPAT_SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned int, offset_high,
91 unsigned int, offset_low, loff_t __user *, result,
92 unsigned int, origin)
93 {
94 return sys_llseek(fd, offset_high, offset_low, result, origin);
95 }
96
97 /* Provide the compat syscall number to call mapping. */
98 #undef __SYSCALL
99 #define __SYSCALL(nr, call) [nr] = (call),
100
101 /* See comments in sys.c */
102 #define compat_sys_fadvise64_64 sys32_fadvise64_64
103 #define compat_sys_readahead sys32_readahead
104 #define sys_llseek compat_sys_llseek
105
106 /* Call the assembly trampolines where necessary. */
107 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
108 #define sys_clone _sys_clone
109
110 /*
111 * Note that we can't include <linux/unistd.h> here since the header
112 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
113 */
114 void *compat_sys_call_table[__NR_syscalls] = {
115 [0 ... __NR_syscalls-1] = sys_ni_syscall,
116 #include <asm/unistd.h>
117 };
118